TITLE: GCN CIRCULAR NUMBER: 32617 SUBJECT: GRB 220930A: AbAO Optical Upper Limit DATE: 22/10/02 22:48:28 GMT FROM: Alexei Pozanenko at IKI, Moscow apozanen@iki.rssi.ru
N. Pankov (IKI), R. Ya. Inasaridze (AbAO), A. Pozanenko (IKI), S. Belkin (IKI, HSE), V. R. Ayvazian (AbAO), D. Datashvili (AbAO), G. V. Kapanadze (AbAO) report on behalf of GRB IKI FuN:
We observed the field of GRB 220930A (Cenko et. al, GCN 32603) with AS-32 telescope of Abastumani Observatory (AbAO). We do not detect any objects within enhanced Swift-XRT error region (Evans et. al, GCN 32608). The 3-sigma upper limit is following:
Date, UT start, t-T0, Exp., Filter, OT, Err, UL(3 sigma) (mid, days)
2022-09-30 22:09:17 0.48085 70*60 R n/d n/d 22.3
The photometry is based on nearby USNO-B1.0 stars USNO_B10_id R2 1033-0057261 16.60 1033-0057239 17.39
The obtained result is consistent with non-detections reported earlier (Watson et. al, GCN 32604; Hu et al, GCN 32606; Lipunov et al, GCN 32607; Belles and Cenko, GCN 32609; Strausbaugh and Cucchiara, GCN 32610).