GCN Circular 31714
Subject
GRB 220306B: Mondy optical observations, confirmation afterglow candidate
Date
2022-03-08T22:01:09Z (2 years ago)
From
Alexei Pozanenko at IKI, Moscow <apozanen@iki.rssi.ru>
S. Belkin (IKI), A. Pozanenko (IKI), E. Klunko (ISTP), R. Ya.
Inasaridze (AbAO), N. Pankov (HSE) report on behalf of GRB IKI FuN:
We observed the field of Swift GRB 220306B (Caputo et al. GCN 31697)
which is also detected by GBM/Fermi (Wood et al., GCN 31702) with
AZT-33IK telescope of Mondy observatory in R-filter starting on
Mar. 07 (UT) 16:42:31. We detected the object (Belkin et al., GCN
31705; Klose et al., GCN 31711) at the S-E edge of the enhanced XRT
position (Evans et al. GCN 31700). Due to non-optimal seeing we cannot
discriminate a possible optical afterglow from the object. Preliminary
aperture photometry of the object is following
Date UT start t-T0 Filter Exp. OT Err. UL(3sigma)
(mid, days) (s)
2022-03-07 16:42:31 0.94924 R 20*120 21.20 0.22 22.0
The R magnitude of the object seems still to be brighter than R_mag
deduced for the object assuming the object is a star. Taking into
account results of observations (Belkin et al., GCN 31705; this GCN)
and Tautenburg observations (Klose et al., GCN 31711) we would more
firmly suggest the object is the afterglow of GRB 220306B. The object
Pan-STARRS objID 193630053894966412 could be a host galaxy of GRB
220306B.