GCN Circular 22331
Subject
GRB 180111A: AbAO optical observations
Date
2018-01-13T19:36:34Z (6 years ago)
From
Alexei Pozanenko at IKI, Moscow <apozanen@iki.rssi.ru>
E. Mazaeva (IKI), A. Pozanenko (IKI), R. Inasaridze (AbAO), S. Schmalz
(ISON), V. Ayvazian (AbAO), O. Kvaratskhelia (AbAO), G. Inasaridze
(AbAO), A. Volnova (IKI), I. Molotov (KIAM), report on behalf of larger
GRB follow-up collaboration:
We observed the field of the Swift GRB 180111A (Lien et al., GCN 22318)
with AS-32 (0.7m) telescope of Abastumani Observatory starting on Jan., 11
(UT) 23:53:51. We obtained several unfiltered images of the field. Within
enhanced XRT error circle (Evans et al., GCN 22319) we detected the
afterglow (Lien et al., GCN 22318; Xin et al., 22320; GCN Butler et al.,
GCN 22323; Gropp et al., GCN 22327).
Preliminary photometry of the afterglow is following
Date UT start t-T0 Filter Exp. OT Err UpLim
(3 sigma)
(mid, days) (s)
2018-01-11 23:53:51 0.3213 CR 62*60 20.7 0.2 22.0
Photometry is based on nearby USNO-B1.0 stars (R2 magnitudes)
USNO-B.1_id R2
1382-0239231 15.78
1383-0226386 16.52
1383-0226440 15.90