GCN Circular 42087
Subject
GRB 251002A: AKO Early Optical Afterglow Detection
Event
Date
2025-10-03T11:28:22Z (5 days 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 Shaikha Alshamsi, and Nidhal
Guessoum (American University of Sharjah, UAE), report:
We observed the field of GRB 251002A detected by SVOM/ECLAIRs (Saccardi et
al., GCN 42060), using our 0.36m f/7.7 robotic telescope. The observation
session began on 02 October 2025 at 21:08 UT, with a midpoint at 21:44 UT,
approximately 1.49 hours after the trigger.
We obtained 20 exposures of 180 seconds each using the Ic filter. The
optical afterglow was detected at:
R.A. (J2000): 00:55:38.0
Dec. (J2000): -05:34:01.9
Our detection is consistent with the results of (Palmerio et al., GCN
42061), (Turpin et al., GCN 42062), (Jelinek et al., GCN 42063),
(Perez-Fournon et al., GCN 42064), (Moskvitin et al., GCN 42065),
(Perez-Garcia et al., GCN 42066), (Lipunov et al., GCN 42067), (Saccardi et
al., GCN 42076), (Mandrakas et al., GCN 42077), (Cao et al., GCN 42078),
(Schneider et al., GCN 42080), (Pankov et al., GCN 42081) and (Leonini et
al., GCN 42082).
The following observation was calculated using the Atlas catalogue as a
reference:
----------------------------------------------------------------------------
ObsTime (mid), Exposure (sec), Filter, Mag
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2025-10-02T21:44:20Z, 20x180s (stacked), Ic, 18.57 +/- 0.27
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The magnitude is not corrected for galactic extinction.