GCN Circular 32255
Subject
GRB 220623A: AbAO optical upper limit
Event
Date
2022-06-24T01:50:04Z (4 years ago)
From
Alexei Pozanenko at IKI, Moscow <apozanen@iki.rssi.ru>
N. Pankov (IKI), A. Pozanenko (IKI), R. Ya. Inasaridze (AbAO), S.
Belkin (IKI), V. R. Ayvazian (AbAO), D. Datashvili (AbAO), G. V.
Kapanadze (AbAO) report on behalf of GRB IKI FuN
We observed the field of GRB 220623A detected by Swift (Sbarufatti et
al., GCN 32243; Kennea et al., GCN 32244), AstroSat (Gopalakrishnan et
al., GCN 32246) and AGILE (Ursi et al., GCN 32247) with AS-32 telescope
of Abastumani Observatory (AbAO). We do not detect any optical sources
within enhanced XRT position (Beardmore et al., GCN 32248). In
particular we do not detect the source reported by Y.-D. Hu et al. (GCN
32251). Preliminary upper limit of a stacked image is following:
Date, UT start, t-T0, Exp., Filter, OT, Err, UL(3 sigma)
(mid, days)
2022-06-23 17:53:02 0.47313 65*60 R n/d n/d 21.5
The photometry is based on nearby USNO-B1.0 stars, R2 magnitude
USNO-B1.0_id R2
1658-0059467 15.40
1658-0059509 15.39