[vsnet-grb-info 17139] GRB 151027A : ISON-NM early optical detection
GCN Circulars
gcncirc at capella2.gsfc.nasa.gov
Tue Oct 27 14:49:48 JST 2015
TITLE: GCN CIRCULAR
NUMBER: 18480
SUBJECT: GRB 151027A : ISON-NM early optical detection
DATE: 15/10/27 05:47:05 GMT
FROM: Alexei Pozanenko at IKI, Moscow <apozanen at iki.rssi.ru>
L. Elenin (KIAM), E. Mazaeva (IKI), A. Volnova (IKI), I. Molotov (KIAM),
A. Pozanenko (IKI) report on behalf of larger GRB follow-up collaboration:
We observed the field of the Swift GRB 151027A (Maselli et al., GCN 18478)
with 0.4-m telescope of ISON-NM observatory in robotic mode starting on
Oct., 27 (UT) 03:59:43 i.e. 79 seconds after burst trigger. We obtained 50
unfiltered images of 30 s exposure. We clearly detect the optical
counterpart of GRB 151027A (Maselli et al., GCN 18478; Zheng and
Filippenko, GCN 18479) in coordinates (J2000) 18 09 56.69 +61 21 13.2. In
the first image we estimated brightness of the optical counterpart as ~14m.
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