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GCN Circular 35270

GRB 231205B: AKO Optical Upper Limit
2023-12-05T18:46:35Z (6 months ago)
Mohammad Odeh at Al Khatim Observatory M44 <>
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Mohammad Odeh (Al-Khatim Observatory, AKO, operated by the International
Astronomical Center in Abu Dhabi, UAE), and Dalya Akl (American University
of Sharjah, UAE), report:

We observed the field of GRB 231205B, which was detected by Swift/BAT (GCN
35269) with our 0.36m f/7.7 robotic telescope on December 05 starting at
17:37:44 UT (corresponding to 0.9 hours from the GRB trigger time) using an
(Ic) filter.

We obtained 17x180s images. We do not detect a credible source within the
Swift-XRT error region (Evans et al., GCN 35269). The following 5-sigma
 upper limit is calculated using the ATLAS catalog as a reference: Ic =

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