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GCN Circular 32894

Subject
GRB 221028A: AKO Optical Upper Limit
Date
2022-10-30T20:24:14Z (a year ago)
From
Mohammad Odeh at Al Khatim Observatory M44 <mshodeh@gmail.com>
Mohammad Odeh at Al-Khatim Astronomical Observatory (AKO), operated by the
International Astronomical Center (IAC), in Abu Dhabi, the United Arab
Emirates.



We observed the GRB 221028A  (Lien et al., GCN 32874) with our 0.36m
telescope on 30 October from 15:39 to 16:44 (UT). We obtained exposures in
the B, V, and Ic filters and did not detect any afterglow within XRT
localization (Lien et al., GCN 32874). This is consistent with the reported
non-detections of (Hu et al., GCN 32878; Lipunov et al., GCN 32879;
Strausbaugh et al., GCN 32881; Niwano et al., GCN 32883; Kumar et al., GCN
32886; Watson et al., GCN 32888; Belkin et al., GCN 32889).



Each image consists of seven stacked frames, each frame is a 3-minute
exposure. The obtained upper limits are as follows:



Mid Time (UT), Filter, Lim. Mag.

2022-10-30T16:16:06Z, B, > 18.3

2022-10-30T16:13:03Z, V, > 19.6

2022-10-30T16:09:22Z, Ic, > 20.2
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