David's Astronomy Pages Images - Session 1282 (2024-12-12)

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Images (S1283)

Objects	Session Notes
GRB 241213A - Attempted GRB afterglow observation (non-detection)             Variable Stars (photometric monitoring) - None     Nearby Stars (astrometric monitoring) - None	- Post-Midnight Session (6.7 hr) partially interrupted by cloud.  Cold night  (-2°C).     - 12" LX200 + ST-10XME for imaging - TS 80mm APO + ZWO ASI178MC for guiding & imaging - Ambient Temperature: -2°C (min) - CCD Temperature: -25°C - Notes from 2024-12-12 >>     -

Observing Result

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GRB 241213A - Attempted GRB afterglow observation (non-detection)

GRB 241213A  (Lynx) Alias: GRB Swift 1274039 Burst at 2024-12-13 02:19:00 UT, Trigger: 1274039 Trigger Coords  07 44 35.496, +35 16 49.44 (confidence 3') Final Coords  07 44 41.130,  +35 16 44.60 (90% confidence 2") https://www.swift.ac.uk/sper/1274039/ https://www.swift.ac.uk/xrt_positions/01274039/ https://swift.gsfc.nasa.gov/results/BATbursts/1274039/bascript/top.html

GRB Swift 1274039 / GRB 241213A - 2024-12-13 (T+0.0d) Position of GRB (not visible) is shown by white circle

Annotated CCD Image (50% size, square root scale) 5 x 180s exposure (average combine), 3x3 binning, Clear Filter 2024-12-13 02:38 UT (#1282039-43) 12" LX200R (at f/10.4) + ST-10XME Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

First Image of the GRB Swift 1274039 Target (02:19:57) taken 57s after the GRB Burst This is 5s Locate Frame that was used for fine-centering the telescope Image Linking (PlateSolving) indicated the telescope positional error after slew was 1.3' Yellow cross-hairs is the GRB Position from the Swift-BAT GRB Position Notice with a 3' error radius (blue circle). The white cross-hairs is the image centre Distance between yellow and white cross-hairs is 1.3'

Annotated Raw CCD Image (70% size, linear scale) 5s exposure (single frame), 3x3 binning, Clear Filter 2024-12-13 02:19:58 UT (#1282030) 12" LX200R (at f/10.4) + ST-10XME

First 30s image of the GRB Swift 1274039 Target (02:21:20) taken 2m 19s after the GRB Burst Blue circle is a 3.0' confidence (error) radius centred on the Swift BAT Alert Coordinates for 1274039 The final XRT determined position of the GRB 241213A (white cross-hairs) was added later.

Annotated Raw CCD Image (70% size, linear scale) 30s exposure (single frame), 3x3 binning, Clear Filter 2024-12-13 02:21:20 UT (#1282031) 12" LX200R (at f/10.4) + ST-10XME Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

GRB Swift 1274039 / GRB 241213A  - 2024-12-13 (T+02m19s to T+04m15) Image below (2024-12-13.103) was taken 0.00007 - 0.00012  days after discovery of  GRB 241213A Position of GRB (not visible) is shown by white cross-hairs Non-Detection Limiting Magnitude +18.5 (Clear Filter)

Annotated CCD Image (150% size, square root scale, cropped 3 x 30s exposure (average combine), 3x3 binning, Clear Filter 2024-12-13 02:22 UT (#1282031-33) 12" LX200R (at f/10.4) + ST-10XME Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

Negative CCD Image (150% size, square root scale, cropped Image details as above

GRB Swift 1274039 / GRB 241213A  - 2024-12-13 (T+10m06s to T+26m34s) Image below (2024-12-13.103) was taken 0.00029 - 0.00077 days after discovery of  GRB 241213A Position of GRB (not visible) is shown by white cross-hairs Non-Detection Limiting Magnitude +19.3 (Clear Filter)

Annotated CCD Image (150% size, square root scale, cropped 5 x 180s exposure (average combine), 3x3 binning, Clear Filter 2024-12-13 02:38 UT (#1282039-43) 12" LX200R (at f/10.4) + ST-10XME Auto-guided using TS 80mm APO, ZWO ASI178MC & PHD2

Negative CCD Image (150% size, square root scale, cropped Image details as above

Assessment was that the imaging had successfully made an immediate post-GRB optical observation, but no optical counterpart was visible. The non-detection limiting magnitude was +19.3,  so any optical counterpart to the GRB  (if any) must be dimmer than this value.

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