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GCN Circular 18480

Subject
GRB 151027A : ISON-NM early optical detection
Date
2015-10-27T05:47:05Z (8 years ago)
From
Alexei Pozanenko at IKI, Moscow <apozanen@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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