GCN Circular 16728
Subject
GRB 140818B: ISON-Kislovodsk and ISON-Burakan optical upper limit
Date
2014-08-20T14:50:32Z (10 years ago)
From
Alexei Pozanenko at IKI, Moscow <apozanen@iki.rssi.ru>
A. Pozanenko (IKI), E. Romas (ISON), V. Nevskiy (ISON), G. Ohanian
(Byurakan Astrophisical Observatory), H. Andreasyan (Byurakan
Astrophisical Observatory), A. Volnova (IKI), I. Molotov (KIAM),
report on behalf of larger collaboration:
We observed the field of GRB 140818B (Vargas et al., GCN 16709) with
Santel-400AN telescope of ISON-Kislovodsk observatory starting on (UT)
18:54:36 and ISON-Burakan ORI-40 starting on (UT) 18:55:08. In the
enhanced XRT position (Beardmore et al., GCN 16712) we do not detect
optical afterglow candidate (Aceituno et al., GCN 16711; Knust et al.,
GCN 16713) neither in the first image nor in the stacked images.
Preliminary photometry is based on nearby USNO-B1.0 stars, R2 magnitudes:
Date UT start t-T0 Filter Exp. UL(3 sigma) Observatory
(mid, days) (s)
2014-08-18 18:54:36 0.0198 None 7*100 19.0 Kislovodsk
2014-08-18 18:55:08 0.0174 None 21*60 18.5 Burakan