GCN Circular 31705
Subject
GRB 220306B: AbAO optical observations, possible afterglow candidate
Date
2022-03-07T15:44:23Z (2 years ago)
From
Alexei Pozanenko at IKI, Moscow <apozanen@iki.rssi.ru>
S. Belkin (IKI), A. Pozanenko (IKI), R. Ya. Inasaridze (AbAO), N.
Pankov (HSE, IKI), D. Datashvili (AbAO), V. R. Ayvazian (AbAO), G. V.
Kapanadze (AbAO) 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 AS-32
telescope of Abastumani observatory (AbAO) in R-filter starting on
Mar. 06 (UT) 18:32:11. We detected the object at the edge (2.6 arcsec
apart) of the enhanced XRT position (Evans et al. GCN 31700). The object
is also presented in Pan-STARRS as a red source (objID
193630053894966412, r=21.42, i= 20.70, z=20.54). 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)
2022-03-06 18:32:11���� 0.02886�� R�������� 50*60����19.98 0.12 ���� 22.7
The R magnitude of the object seems to be brighter than R_mag deduced
for the object assuming the object is a star. We may suggest the
afterglow superimposed of the object (Pan-STARRS objID
193630053894966412) and the red PanSTARRS object could be a host galaxy
of GRB 220306B.