GCN Circular 29270
Subject
GRB 210102B: Assy optical afterglow identification
Event
Date
2021-01-06T15:55:15Z (5 years ago)
From
Alexei Pozanenko at IKI, Moscow <apozanen@iki.rssi.ru>
A. Pozanenko (IKI), S. Belkin (IKI), V. Kim (FAI, Pulkovo Observatory),
M. Krugov (FAI) report on behalf of GRB IKI FuN:
We continued observations of XRT candidate (Burrows et al., GCN 29230)
of MAXI GRB 210102B (Guo et al., GCN 29223) with AZT-20 telescope of
Assy-Turgen observatory starting on Jan. 05 (UT) 13:00:53, i.e. ~3.2
days after trigger. At the place of the only one of XRT candidate
(Burrows et al., GCN 29230) we do not detect the optical object found
early (Pozanenko et al., GCN 29240).
Preliminary photometry of the field is following
Date UT start t-T0 Filter Exp. OT Err. UL (3sigma)
(mid, days) (s)
2021-01-05 13:00:53 3.20177 r'(AB) 76*60 n/d n/d 23.1
The photometry is based on the stars of PanSTARRS-PS1
RA DEC r'
23:35:20.67802 -21:04:16.4688 19.656
23:35:47.99017 -21:11:53.6544 17.807
We confirm the optical object reported in GCN 29240 as an afterglow of
GRB 210102B.