GCN Circular 21203
Subject
GRB 170604A: AbAO optical observations
Date
2017-06-05T15:48:31Z (7 years ago)
From
Alexei Pozanenko at IKI, Moscow <apozanen@iki.rssi.ru>
E. Mazaeva (IKI), R. Inasaridze (AbAO), A. Pozanenko (IKI), A. Volnova
(IKI), V. Ayvazian (AbAO), O. Kvaratskhelia (AbAO), G. Inasaridze
(AbAO), I. Molotov (KIAM), report on behalf of larger GRB follow-up
collaboration:
We observed the field of the Swift GRB 170604A (Page et al., GCN 21191)
with AS-32 (0.7m) telescope of Abastumani Observatory starting on
June, 04 (UT) 23:52:07. We obtained several unfiltered images of the
field. Within enhanced XRT error circle (Page et al., GCN 21196) we
detected the afterglow (Izzo et al, GCN 21192; Izzo et al, GCN 21197;
Schady, , GCN 21200). Preliminary photometry of the afterglow is following
Date UT start t-T0 Filter Exp. OT Err UpLim (3 sigma)
(mid, days) (s)
2017-06-04 23:52:07 0.19950 CR 5*60 19.13 0.18 21.0
2017-06-05 00:00:50 0.20675 CR 7*60 19.23 0.16 21.1
2017-06-05 00:13:02 0.21885 CR 13*60 19.30 0.22 20.6
Photometry is based on nearby USNO-B1.0 stars (R2 magnitudes)
USNO-B.1_id R2
0746-0830331 14.71
0746-0830367 14.76
0746-0830438 15.14
0746-0830455 14.77
0747-0821123 14.60
[GCN OPS NOTE(05jun17): Per author's request, the duplicate text
of this circular was removed.]