David's Astronomy - Astronomical Transients 2025

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Astronomical Transients - 2025

Transients
2024

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Transients
2025

This page documents observations and images of Astronomical Transients (AT) with discovery dates in 2025.
(Note: Supernovae in 2025 are presented on a separate page : SN 2025 )
(Note: Some images may roll over into the following year)

Galactic Transients (2025)
     Name, type, discovery date

AT 2025il - CV Type Transient, RU Peg (2025-01-07)

AT 2025la - Transient (2025-01-11) (non-detection)

AT 2025lc - CV Type Transient (2025-01-10)

AT 2025lr - Afterglow Type Transient (2025-01-14) (non-detection)

AT 2025md - CV Type Transient, V1948 Cyg (2025-01-12)

AT 2025oj - CV Type Transient (2025-01-15) (non-detection)

AT 2025esv - Type CV? Transient (2025-03-17)

AT 2025esy - Type CV? Transient (2025-03-17) (non-detection)

AT 2025euu - Type CV? Transient (2025-03-19)

AT 2025fbc - CV Type Transient (2025-03-20) (non-detection)

AT 2025fuz - Type CV? Transient (2025-03-25) (non-detection)

AT 2025ghv - Type CV? Transient (2025-03-31)

AT 2025gnb - Transient (2025-04-02)

AT 2025gsf - Transient (2025-04-04)

Extragalactic Transients (2025)
     Name, type, discovery date, host galaxy (if relevant)

M31 Transients

M33 Transients

Other Extragalactic Transients

AT 2025fk - Transient (2025-01-03) in MCG -2-28-37

AT 2025hy - Transient (2025-01-01) in UGC 10913

Galactic Transients (2025)

AT 2025il - CV Type Transient, RU Peg (discovered 2025-01-07)

AT 2025il (Pegasus)
AT 2025il (Type: CV) discovered 2025-01-07.343 UT by Gaia
using Gaia Spacecraft Telescope
Alias: Gaia25abx
Discovery Magnitude 11.34 (G-Gaia Filter)
vis Historic Magnitude 12.40 +/- 0.41 SD
Outburst in CV RU Peg
( TNS 2025il | Gaia25abx )

AT 2025il - 2025-04-02 (T+84.8d)
Image below (2025-04-02.169) was taken 84.8 days after discovery of 2025il
Position of reported transient (distinct) is shown by white cross-hairs
Measured Magnitude +12.41 (Clear Filter)
Likely back within normal range (12.1 to 12.75)

Annotated CCD Image (100% size, linear scale, cropped)
5 x 60s exposure (average combine), 3x3 binning, Clear Filter
2025-04-02 04:06 UT (#1308227-31)
12" LX200R (at f/10.4) + ST-10XME
Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

AT 2025la - Transient (discovered 2025-01-11) (non-detection)

AT 2025la (Cygnus)
AT 2025la (Type: unk) discovered 2025-01-11.109 UT by Gaia
Alias: Gaia25acy
Discovery Magnitude 16.89 (orange-ATLAS Filter)
vs Prior Non-Detection Limiting Magnitude 19.34
[ TNS 2025la | Gaia25acy ]

AT 2025la - 2025-03-18 (T+66.0d)
Image below (2025-03-18.125) was taken 66.0 days after discovery of 2025la
Positon of earlier transient (not visible) is shown by white cross hairs.
Non-Detection Limiting Magnitude +18.5 (Clear Filter)

Annotated CCD Image (100% size, linear scale, cropped)
4 x 180s exposure (average combine), 3x3 binning, Clear Filter
2025-03-18 03:08 UT (#1302182-86)
12" LX200R (at f/10.4) + ST-10XME
Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

AT 2025la - 2025-03-29 (T+77.0d)
Image below (2025-03-29.101) was taken 77.0 days after discovery of 2025la
Positon of earlier transient (very faint ?) is shown by white cross hairs.
Non-Detection Limiting Magnitude +18.5 (Clear Filter)

Annotated CCD Image (100% size, linear scale, cropped)
3 x 180s exposure (average combine), 3x3 binning, Clear Filter
2025-03-29 02:30 UT (#1306130-32)
12" LX200R (at f/10.4) + ST-10XME
Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

AT 2025la - Detail, 2025-03-29 (T+77.0d)
Image below (2025-03-29.101) was taken 77.0 days after discovery of 2025la
Positon of earlier transient (not visible) is shown by white cross hairs.
Non-Detection Limiting Magnitude +18.5 (Clear Filter)
The detailed image below when compared with reference images in Aladin
demonstrate that the earlier transient is not visible.
The fuzzy blob just left and above the A2025la location is galaxy WISEA J212348.12+284231.1
The object just to left of the A2025la location is a faint star (and is not AT2025la)

Annotated CCD Image (150% size, linear scale, cropped)
3 x 180s exposure (average combine), 3x3 binning, Clear Filter
2025-03-29 02:30 UT (#1306130-32)
12" LX200R (at f/10.4) + ST-10XME
Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

AT 2025lc - CV Type Transient (discovered 2025-01-10)

AT 2025lc (Cygnus)
AT 2025lc (Type: CV) discovered 2025-01-10.553 UT by Gaia
Alias: Gaia25add
Alerting Magnitude 14.48 (G-Gaia Filter)
vs Historic Magnitude 15.89 +/- 0.61 SD
Outburst in candidate CV
( TNS 2025lc | Gaia25add )

AT 2025lc - 2025-03-15 (T+63.5d)
Image below (2025-03-15.080) was taken 63.5 days after discovery of 2025lc
Position of earlier transient (faint) is shown by white cross-hairs
Measured Magnitude +13.69 (Clear Filter)
Appears to be either still be in outburst (from Jan 10th)
or has started a new outburst.

Annotated CCD Image (100% size, linear scale, cropped)
5 x 60s exposure (average combine), 3x3 binning, Clear Filter
2025-03-15 01:58 UT (#1301164-68)
12" LX200R (at f/10.4) + ST-10XME
Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

AT 2025lc - 2025-03-29 (T+77.5d)
Image below (2025-03-29.076) was taken 77.5 days after discovery of 2025lc
Position of earlier transient (very faint) is shown by white cross-hairs
Estimated Magnitude +15.9 (Clear Filter)
Star faded and is again at low-state.

Annotated CCD Image (100% size, linear scale, cropped)
5 x 60s exposure (average combine), 3x3 binning, Clear Filter
2025-03-29 01:53 UT (#1306105-09)
12" LX200R (at f/10.4) + ST-10XME
Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

AT 2025lc - 2025-04-10 (T+89.6d)
Image below (2025-04-10.126) was taken 89.6 days after discovery of 2025lc
Position of earlier transient (very faint) is shown by white cross-hairs
Estimated Magnitude +16.0 (Clear Filter)
Star is in its low-state.

Annotated CCD Image (100% size, linear scale, cropped)
4 x 60s exposure (average combine), 3x3 binning, Clear Filter
2025-04-10 03:05 UT (#1313163-67)
12" LX200R (at f/10.4) + ST-10XME
Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

AT 2025lr - Afterglow Type Transient (discovered 2025-01-14) (non-detection)

AT 2025lr (Crater)
AT 2025lr (Type: Afterglow) discovered 2025-01-14.316 UT by MASTER
Alias: MASTER OT J110618.40-150641.1, GRB 250114A
Discovery Magnitude 15.9 (? Filter)
vs Prior Non-Detection Limiting Magnitude 19.7
Remarks: GRB 250114A optical counterpart
[ TNS 2025lr ]

AT 2025lr - 2025-03-17 (T+62.7d)
Image below (2025-03-17.995) was taken 62.7 days after discovery of 2025lr
Positon of reported transient (faded & no longer visible) is shown by white circle
Non-Detection Limiting Magnitude +18.5 (Clear Filter)

Annotated CCD Image (100% size, square root scale, cropped)
2 x 180s exposure (average combine), 3x3 binning, Clear Filter
2025-03-17 23:56 UT (#1302100-01)
12" LX200R (at f/10.4) + ST-10XME
Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

AT 2025lr - 2025-03-28 (T+73.6d)
Image below (2025-03-28.915) was taken 73.6 days after discovery of 2025lr
Positon of reported transient (faded & no longer visible) is shown by white circle
Non-Detection Limiting Magnitude +19.0 (Clear Filter)

Annotated CCD Image (100% size, square root scale, cropped)
2 x 180s exposure (average combine), 3x3 binning, Clear Filter
2025-03-28 22:01 UT (#1306039-40)
12" LX200R (at f/10.4) + ST-10XME
Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

AT 2025md - CV Type Transient, V1948 Cyg (discovered 2025-01-12)

AT 2025md (Cygnus)
AT 2025md (Type: CV) discovered 2025-01-12.882 UT by Gaia
Alias: Gaia25adm, V1948 Cyg
Alerting Magnitude 13.47 (G-Gaia Filter)
vs Historic Magnitude 14.94 +/- 0.65 SD
Outburst in known CV named V1948 Cyg
( TNS 2025md | Gaia25adm )

AT 2025md - 2025-03-15 (T+61.2d)
Image below (2025-03-15.072) was taken 61.2 days after discovery of 2025md
Position of earlier transient (faint but distinct) is shown by white cross-hairs
Measured Magnitude +12.49 ? (Clear Filter)
A very faint star lies directly adjacent to AT2025md
The AT 2025md star seems somewhat fainter than the magnitude measurement (+12.49) suggests
(this view is supported by later image at T+75.2d which shows magnitude +15.49)

Annotated CCD Image (150% size, linear scale, cropped)
5 x 60s exposure (average combine), 3x3 binning, Clear Filter
2025-03-15 01:46 UT (#1301157-61)
12" LX200R (at f/10.4) + ST-10XME
Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

AT 2025md - 2025-03-29 (T+75.2d)
Image below (2025-03-29.085) was taken 75.2 days after discovery of 2025md
Position of earlier transient (faint but distinct) is shown by white cross-hairs
Measured Magnitude +15.49 (Clear Filter)

Annotated CCD Image (150% size, linear scale, cropped)
4 x 60s exposure (average combine), 3x3 binning, Clear Filter
2025-03-29 02:05 UT (#1306112-15)
12" LX200R (at f/10.4) + ST-10XME
Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

AT 2025md - 2025-04-09 (T+87.1d)
Image below (2025-04-09.962) was taken 87.1 days after discovery of 2025md
Position of earlier transient (faint but distinct, brightening?) is shown by white cross-hairs
Measured Magnitude +14.48 (Clear Filter)

Annotated CCD Image (150% size, linear scale, cropped)
5 x 60s exposure (average combine), 3x3 binning, Clear Filter
2025-04-09 23:08 UT (#1313052-56)
12" LX200R (at f/10.4) + ST-10XME
Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

AT 2025oj - CV Type Transient (discovered 2025-01-15) (non-detection)

AT 2025oj (Vulpecula)
AT 2025oj (Type: CV) discovered 2025-01-15.040 UT by Gaia
Alias: Gaia25aeh
Alerting Magnitude 15.86 (G-Gaia Filter)
vs Historic Magnitude 18.31 +/- 0.26 SD
Outburst in candidate eclipsing CV ZTF18abmnvsq
( TNS 2025oj | Gaia25aeh )

AT 2025oj - 2025-03-15 (T+59.1d)
Image below (2025-03-15.120) was taken 59.1 days after discovery of 2025oj
Position of earlier transient (not visible) is shown by white cross-hairs
Non Detection Limiting Magnitude +17.0 (Clear Filter)
Star seems to have faded back to within its normal magnitude range (+17.7 to +19.5, Gaia)
Propose to reschedule target using 5 x 180s frames for better chance of detection

Annotated CCD Image (125% size, linear scale, cropped)
3 x 60s exposure (average combine), 3x3 binning, Clear Filter
2025-03-15 02:55 UT (#1301194-96)
12" LX200R (at f/10.4) + ST-10XME
Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

AT 2025oj - 2025-04-03 (T+78.1d)
Image below (2025-04-03.119) was taken 78.1 days after discovery of 2025oj
Position of earlier transient (not visible) is shown by white cross-hairs
Non Detection Limiting Magnitude +17.0 (Clear Filter)
Star seems to have faded back to within its normal magnitude range (+17.7 to +19.5, Gaia)
Star is not visible even after increasing subframe exposure from 60s to 180s

Annotated CCD Image (125% size, linear scale, cropped)
4 x 180s exposure (average combine), 3x3 binning, Clear Filter
2025-04-03 02:59 UT (#1309157-60)
12" LX200R (at f/10.4) + ST-10XME
Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

AT 2025esv - Type CV? Transient (discovered 2025-03-17)

AT 2025esv (Cygnus)
AT 2025esv (Type: CV?) discovered 2025-03-17.910 UT by XOSS
Alias: KATS25F002, TCP J19584776+4119174
Discovery Magnitude 16.93 (Clear Filter)
( TNS 2025esv )

AT 2025esv - 2025-04-01 (T+14.2d)
Image below (2025-04-01.112) was taken 14.2 days after discovery of 2025esv
Position of reported transient (very faint) is shown by white cross-hairs

Annotated CCD Image (100% size, linear scale, cropped)
3 x 180s exposure (average combine), 3x3 binning, Clear Filter
2025-04-01 02:49 UT (#1307116-20)
12" LX200R (at f/10.4) + ST-10XME
Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

AT 2025esv - Detail (T+14.2d)
Position of reported transient (very faint) is shown by white cross-hairs
Measured Magnitude +17.59 (Clear Filter)

Annotated CCD Image (175% size, linear scale, cropped)
3 x 180s exposure (average combine), 3x3 binning, Clear Filter
2025-04-01 02:49 UT (#1307116-20)
12" LX200R (at f/10.4) + ST-10XME
Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

AT 2025esy - 2025-04-03 (T+16.2d)
Image below (2025-04-03.144) was taken 16.2 days after discovery of 2025esy
Position of reported transient (not visible) is shown by white cross-hairs

Annotated CCD Image (175% size, linear scale, cropped)
4 x 180s exposure (average combine), 3x3 binning, Clear Filter
2025-04-03 03:36 UT (#1309169-72)
12" LX200R (at f/10.4) + ST-10XME
Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

AT 2025esy - Type CV? Transient (discovered 2025-03-17) (non-detection)

AT 2025esy (Serpens)
AT 2025esy (Type: CV?) discovered 2025-03-17.919 UT by XOSS
Alias: KATS25F005, TCP J17265310-1544375
Discovery Magnitude 15.77 (Clear Filter)
( TNS 2025esx )

AT 2025esy - 2025-04-01 (T+14.2d)
Image below (2025-04-01.140) was taken 14.2 days after discovery of 2025esy
Position of reported transient (not visible) is shown by white cross-hairs

Annotated CCD Image (100% size, linear scale, cropped)
4 x 180s exposure (average combine), 3x3 binning, Clear Filter
2025-04-01 03:28 UT (#1307137-40)
12" LX200R (at f/10.4) + ST-10XME
Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

AT 2025esy - Detail (T+14.2d)

Annotated CCD Image (175% size, linear scale, cropped)
4 x 180s exposure (average combine), 3x3 binning, Clear Filter
2025-04-01 03:28 UT (#1307137-40)
12" LX200R (at f/10.4) + ST-10XME
Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

AT 2025esy - 2025-04-03 (T+16.2d)
Image below (2025-04-03.144) was taken 16.2 days after discovery of 2025esy
Position of reported transient (not visible) is shown by white cross-hairs

AT 2025euu - Type CV? Transient (discovered 2025-03-19)

AT 2025euu (Perseus)
AT 2025euu (Type: CV?) discovered 2025-03-19.629 UT by XOSS
Alias: KATS25F011, TCP J03453451+4157182
Discovery Magnitude 13.84 (Clear Filter)
( TNS 2025euu )

AT 2025euu - 2025-03-28 (T+9.3d)
Image below (2025-03-28.946) was taken 9.3 days after discovery of 2025euu
Position of reported transient (barely separable) is shown by white cross-hairs

Annotated CCD Image (100% size, linear scale, cropped)
180s exposure (single frame), 3x3 binning, Clear Filter
2025-03-28 22:42 UT (#1306051)
12" LX200R (at f/10.4) + ST-10XME
Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

AT 2025euu - Detail, 2025-03-28 (T+9.3d)
Position of reported transient (barely separable) is shown by white cross-hairs
Estimated Magnitude +15.2 (Clear Filter)

Annotated CCD Image (200% size, linear scale, cropped)
180s exposure (single frame), 3x3 binning, Clear Filter
2025-03-28 22:42 UT (#1306051)
12" LX200R (at f/10.4) + ST-10XME
Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

AT 2025euu - 2025-04-02 (T+13.4d)
Image below (2025-04-02.019) was taken 13.4 days after discovery of 2025euu
Position of reported transient (barely separable) is shown by white cross-hairs

Annotated CCD Image (200% size, linear scale, cropped)
4 x 180s exposure (average combine), 3x3 binning, Clear Filter
2025-04-02 00:36 UT (#1308092-96)
12" LX200R (at f/10.4) + ST-10XME
Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

AT 2025euu - 2025-04-03 (T+15.3d)
Image below (2025-04-03.944) was taken 15.3 days after discovery of 2025euu
Position of reported transient (barely separable) is shown by white cross-hairs

Annotated CCD Image (200% size, linear scale, cropped)
4 x 180s exposure (average combine), 3x3 binning, Clear Filter
2025-04-03 22:47 UT (#1310057-61)
12" LX200R (at f/10.4) + ST-10XME
Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

AT 2025fbc - CV Type Transient (discovered 2025-03-20) (non-detection)

AT 2025fbc (Hercules)
AT 2025fbc (Type: CV) discovered 2025-03-20.918 UT by XOSS
Alias: KATS25F020, TCP J18453198+2349289
Alerting Magnitude 16.25 (Clear Filter)
CV candidate classified by XOSS
( TNS 2025fbc )

AT 2025fbc - 2025-04-08 (T+18.2d)
Image below (2025-04-08.069) was taken 18.2 days after discovery of 2025fbc
Position of earlier transient (not visible) is shown by white cross-hairs
Non-Detection Limiting Magnitude +19.3 (Clear Filter)

Annotated CCD Image (125% size, linear scale, cropped)
4 x 180s exposure (average combine), 3x3 binning, Clear Filter
2025-04-08 01:46 UT (#1312151-54)
12" LX200R (at f/10.4) + ST-10XME
Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

AT 2025fuz - Type CV? Transient (discovered 2025-03-25) (non-detection)

AT 2025fuz (Virgo)
AT 2025fuz (Type: CV?) discovered 2025-03-25.975 UT by MASTER
from MASTER-SAAO Observatory (South Africa)
Alias: MASTER OT J131625.63-151314.3
Discovery Magnitude 15.9 (Other Filter)
vs Prior Non-Detection Limiting Magnitude 20.7
Suggesting a 4.8+ mag rise
( TNS 2025fuz )

AT 2025fuz - 2025-04-02 (T+8.0d)
Image below (2025-04-02.989) was taken 8.0 days after discovery of 2025fuz
Position of reported transient (not visible) is shown by white cross-hairs
Non-detection Limiting Magnitude +19.4 (Clear Filter)
It would seem that the transient has faded rapidly
(having dropped at least 3.5 mag in just 8 days)

Annotated CCD Image (175% size, linear scale, cropped)
5 x 180s exposure (average combine), 3x3 binning, Clear Filter
2025-04-02 23:52 UT (#1309082-86)
12" LX200R (at f/10.4) + ST-10XME
Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

AT 2025ghv - Type CV? Transient (discovered 2025-03-31)

AT 2025ghv (Gemini)
AT 2025ghv (Type: CV?) discovered 2025-03-31.589 UT by XOSS
Alias: PSP25H, TCP J06455595+1210577
Discovery Magnitude 14.88 (Clear Filter)
( TNS 2025ghv )

AT 2025ghv - 2025-04-01 (T+1.3d)
Image below (2025-04-01.899) was taken 1.3 days after discovery of 2025ghv
Position of reported transient (faint) is shown by white cross-hairs

Annotated CCD Image (175% size, linear scale, cropped)
4 x 180s exposure (average combine), 3x3 binning, Clear Filter
2025-04-01 21:42 UT (#1308022-25)
12" LX200R (at f/10.4) + ST-10XME
Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

AT 2025ghv - 2025-04-01 (T+1.3d)
Image below (2025-04-01.899) was taken 1.3 days after discovery of 2025ghv
Position of reported transient (faint) is shown by white cross-hairs
Estimated Magnitude +16.0 (Clear Filter)

Annotated CCD Image (100% size, linear scale, cropped)
4 x 180s exposure (average combine), 3x3 binning, Clear Filter
2025-04-01 21:42 UT (#1308022-25)
12" LX200R (at f/10.4) + ST-10XME
Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

AT 2025ghv - 2025-04-02 (T+2.3d)
Image below (2025-04-02.883) was taken 2.3 days after discovery of 2025ghv
Position of reported transient (faint) is shown by white cross-hairs
Estimated Magnitude +15.5 (Clear Filter)

Annotated CCD Image (100% size, linear scale, cropped)
5 x 180s exposure (average combine), 3x3 binning, Clear Filter
2025-04-02 21:19 UT (#1309025-29)
12" LX200R (at f/10.4) + ST-10XME
Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

AT 2025ghv - Detail (T+2.3d)
Position of reported transient (faint) is shown by white cross-hairs
Estimated Magnitude +15.5 (Clear Filter)

AT 2025ghv - 2025-04-03 (T+3.3d)
Image below (2025-04-03.897) was taken 3.3 days after discovery of 2025ghv
Position of reported transient (faint) is shown by white cross-hairs
Estimated Magnitude +16.0 (Clear Filter)

Annotated CCD Image (175% size, linear scale, cropped)
5 x 180s exposure (average combine), 3x3 binning, Clear Filter
2025-04-03 21:41 UT (#1310030-34)
12" LX200R (at f/10.4) + ST-10XME
Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

AT 2025ghv - 2025-04-07 (T+7.3d)
Image below (2025-04-07.872) was taken 7.3 days after discovery of 2025ghv
Position of reported transient (faint) is shown by white cross-hairs
Estimated Magnitude +16.2 (Clear Filter)

Annotated CCD Image (175% size, linear scale, cropped)
5 x 180s exposure (average combine), 3x3 binning, Clear Filter
2025-04-07 21:05 UT (#1312006-10)
12" LX200R (at f/10.4) + ST-10XME
Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

AT 2025ghv - 2025-04-09 (T+9.3d)
Image below (2025-04-09.938) was taken 9.3 days after discovery of 2025ghv
Position of reported transient (faint, fading) is shown by white cross-hairs
Estimated Magnitude +16.8 (Clear Filter)

Annotated CCD Image (175% size, linear scale, cropped)
4 x 180s exposure (average combine), 3x3 binning, Clear Filter
2025-04-09 22:40 UT (#1313040-44)
12" LX200R (at f/10.4) + ST-10XME
Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

AT 2025gnb - Transient (discovered 2025-04-02) (non-detection)

AT 2025gnb (Gemini)
AT 2025gnb (Type: unk) discovered 2025-04-02.782 UT by MASTER
Alias: MASTER OT J074640.62+173413.1
Discovery Magnitude 16.20 (Clear Filter)
vs Prior Non-Detection Limiting Magnitude 19.9
( TNS 2025gnb )

AT 2025gnb - 2025-04-03 (T+1.1d)
Image below (2025-04-03.869) was taken 1.1 days after discovery of 2025gnb
Position of reported transient (faint) is shown by white cross-hairs
Measured Magnitude +16.91 (Clear Filter)

Annotated CCD Image (100% size, linear scale, cropped)
4 x 180s exposure (average combine), 3x3 binning, Clear Filter
2025-04-03 20:58 UT (#1310015-18)
12" LX200R (at f/10.4) + ST-10XME
Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

AT 2025gnb - 2025-04-09 (T+7.1d)
Image below (2025-04-09.886) was taken 7.1 days after discovery of 2025gnb
Position of reported transient (not visible) is shown by white cross-hairs
Non-Detection Limiting Magnitude +18.6 (Clear Filter)

Annotated CCD Image (100% size, linear scale, cropped)
4 x 180s exposure (average combine), 3x3 binning, Clear Filter
2025-04-09 21:26 UT (#1313009-13)
12" LX200R (at f/10.4) + ST-10XME
Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

AT 2025gsf - Transient (discovered 2025-04-04)

AT 2025gsf (Canes Venatici)
Alias: In WISEA J121839.40+470627.6
AT 2025gsf (Type: unk) discovered 2025-04-04.174 UT by GEOTS
using 0.36-m f/2 astrograph telescope
Alias: GEOTS-Balaji-2025-001, TCP J12183941+4706273
Discovery Magnitude 16.9 (Clear Filter)
vs Prior Non-Detection Limiting Magnitude 17.8
( TNS 2025gsf )

AT 2025gsf - 2025-04-10 (T+5.8d)
Image below (2025-04-10.000) was taken 5.8 days after discovery of 2025gsf
Position of reported transient (faint) is shown by white cross-hairs
Measured Magnitude +16.72 (Clear Filter)

Annotated CCD Image (100% size, linear scale, cropped)
5 x 180s exposure (average combine), 3x3 binning, Clear Filter
2025-04-10 00:09 UT (#1313073-77)
12" LX200R (at f/10.4) + ST-10XME
Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

Extragalactic Transients (2025)

M31 Transients (2025)

M33 Transients (2025)

Other Extragalactic Transients (2025)

AT 2025fk - Transient (discovered 2025-01-03) in MCG -2-28-37

MCG -2-28-37 with AT 2025fk (Crater)
AT 2025fk (Type: unk) discovered 2025-01-03.523 UT by ZTF
Alias: ZTF25aaaqfrf
Discovery Magnitude 18.25 (orange-ATLAS Filter)
vs Prior Non-Detection Limiting Magnitude 18.76
( TNS 2025fk )

MCG -2-28-37 - Spiral Galaxy
MCG -2-28-37 / PGC 33211 (catalog mag +14.7)
with other galaxies in same FOV: PGC 33194 (catalog mag +15.4),
PGC 33178 (catalog mag +16.0), PGC 33179 (catalog mag +16.2)

Annotated CCD Image (50% size, square root scale)
5 x 180s exposure (average combine), 3x3 binning, Clear Filter
2025-03-19 00:23 UT (#1303095-99)
12" LX200R (at f/10.4) + ST-10XME
Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

MCG -2-28-37 with AT 2025fk - 2025-03-19 (T+74.5d)
Image below (2025-03-19.010) was taken 74.5 days after discovery of 2025fk
Position of reported transient (not separately distinguishable) is shown by white cross-hairs
Measured Magnitude, Nucleus + SN +14.19 (Clear Filter)

Annotated CCD Image (150% size, square root scale, cropped)
5 x 180s exposure (average combine), 3x3 binning, Clear Filter
2025-03-19 00:23 UT (#1303095-99)
12" LX200R (at f/10.4) + ST-10XME
Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

AT 2025hy - Transient (discovered 2025-01-01) in UGC 10913

UGC 10913 with AT 2025hy (Hercules)
AT 2025hy (Type: unk) discovered 2025-01-01.573 UT by ZTF
Using Palomar 1.2m Oschin Telescope
Alias: ZTF25aabaclh
Discovery Magnitude 18.29 (r-ZTF Filter)
( TNS 2025hy )

UGC 10913 - Spiral Galaxy

Annotated CCD Image (70% size, square root scale, cropped)
4 x 180s exposure (average combine), 3x3 binning, Clear Filter
2025-03-18 01:52 UT (#1302136-40)
12" LX200R (at f/10.4) + ST-10XME
Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

UGC 10913 with AT 2025hy - 2025-03-18 (T+75.5d)
Image below (2025-03-18.072) was taken 75.5 days after discovery of 2025hy
Position of reported transient (very faint / barely detectable) is shown by white cross-hairs
Poor quality image (trailed stars)

Annotated CCD Image (150% size, square root scale, cropped)
4 x 180s exposure (average combine), 3x3 binning, Clear Filter
2025-03-18 01:52 UT (#1302136-40)
12" LX200R (at f/10.4) + ST-10XME
Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

UGC 10913 with AT 2025hy - 2025-04-07 (T+95.5d)
Image below (2025-04-07.117) was taken 95.5 days after discovery of 2025hy
Position of reported transient (very faint / barely detectable) is shown by white cross-hairs
Poor quality image (trailed stars)

Annotated CCD Image (150% size, square root scale, cropped)
4 x 180s exposure (average combine), 3x3 binning, Clear Filter
2025-04-07 02:58 UT (#1311186-90)
12" LX200R (at f/10.4) + ST-10XME
Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

This Web Page:	Astronomical Transients - 2025
Last Updated :	2025-04-16
Site Owner :	David Richards
Home Page :	David's Astronomy Web Site

David's Astronomy Pages (Deep Sky) Astronomical Transients - 2025