GCN Circular 32317
Subject
GRB 220701A: AbAO optical upper limit
Date
2022-07-02T14:30:24Z (2 years ago)
From
Alexei Pozanenko at IKI, Moscow <apozanen@iki.rssi.ru>
S. Belkin (IKI), N. Pankov (IKI), A. Pozanenko (IKI), R. Ya. Inasaridze
(AbAO), V. R. Ayvazian (AbAO), D. Datashvili (AbAO), G. V. Kapanadze
(AbAO) report on behalf of GRB IKI FuN
We observed the field of GRB 220701A detected by Swift (Evans et al.,
GCN 32306;) with AS-32 telescope of Abastumani Observatory (AbAO)
starting on 2022-07-01 (UT) 17:54:12. We do not detect any optical
sources within enhanced XRT position (Evans et al., GCN 32308). This
upper limit is consistent with earlier and later non detection
(O'Connor et al. GCN 32309; Oates et al. GCN 32310; Hu et al. GCN
32311; Strausbaugh et al. GCN 32313; Zheng et al. GCN 32315).
Preliminary upper limit of a stacked image is following:
Date, UT start, t-T0, Exp., Filter, OT, Err, UL(3 sigma)
(mid, days)
2022-07-01 17:54:12 0.55016 22*60 R n/d n/d 21.0
The photometry is based on nearby USNO-B1.0 stars, R2 magnitude
RA DEC R2
16:10:21.85344 +55:26:18.9924 15.49
16:10:42.83688 +55:25:01.9920 17.38
16:10:59.99544 +55:21:15.1020 16.08
16:10:33.30600 +55:17:14.3520 16.76