GCN Circular 40331
Subject
GRB 250502A: AKO Optical Afterglow Detection
Date
2025-05-03T08:39:13Z (a day ago)
From
Mohammad Odeh at Al Khatim Observatory M44 <mshodeh@gmail.com>
Via
email
Mohammad Odeh (Al-Khatim Observatory, AKO, operated by the International
Astronomical Center in Abu Dhabi, UAE), and Nidhal Guessoum (American
University of Sharjah, UAE), report:
We observed the field of GRB 250502A detected by SVOM (Wang et al., GCN
40313), using our 0.36m f/7.7 robotic telescope. The observation session
began on 02 May 2025 at 15:40 UT, with a midpoint at 16:43 UT, approximately
8 hours after the trigger.
We obtained multiple 180-second exposures using the Ic filter. The optical
afterglow was marginally detected at:
R.A. (J2000): 13:46:05.4
Dec. (J2000): -10:45:32.4
Our detection is consistent with the results of (Rakotondrainibe et al., GCN
40315; An et al., GCN 40319; Li et al., GCN 40320; Ghosh et al., GCN 40322;
de Ugarte Postigo et al., GCN 40328; Pérez-Fournon et al., GCN 40330).
The following observation was calculated using the Atlas catalogue as a
reference:
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ObsTime (mid), Exposure (sec), Filter, Mag
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2025-05-02T16:43:29Z, 40 x 180s (stacked), Ic, 19.74 +/- 0.31
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The magnitude is not corrected for galactic extinction.