GCN Circular 18618
Subject
GRB 151118A: ISON-NM early optical limit
Date
2015-11-18T14:44:20Z (9 years ago)
From
Alexei Pozanenko at IKI, Moscow <apozanen@iki.rssi.ru>
L. Elenin (KIAM), A. Volnova (IKI), E. Mazaeva (IKI), I. Molotov
(KIAM), A. Pozanenko (IKI) report on behalf of larger GRB follow-up
collaboration:
We observed the field of the Swift GRB 151118A (Amaral-Rogers et al.,
GCN 18611) with 0.4-m telescope of ISON-NM observatory in robotic mode
starting on Nov., 18 (UT) 03:08:32 i.e. 122 seconds after burst
trigger. We obtained 6 unfiltered images of 30 s exposure under
unfavorable weather conditions. We do not detect any source within
enhanced XRT error circle (Evans et al., GCN 18614):
Date UT start t-T0 Filter Exp. UL(3 sigma)
(mid, days) (s)
2015-11-28 03:08:32 0.00158 None 1*30 17.4
2015-11-28 03:08:32 0.00265 None 5*30 18.0
The photometry is based on nearby USNO-B1.0 stars:
USNO-B1.0 id R2
1559-0079254 15.66
1558-0078601 16.03
1558-0078636 14.62