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GCN Circular 18697

Subject
GRB 151215A: MASTER early OT detection and light curve
Date
2015-12-15T12:19:35Z (8 years ago)
From
Vladimir Lipunov at Moscow State U/Krylov Obs <lipunov@xray.sai.msu.ru>
R. Rebolo, M. Serra-Ricart, N. Lodieu, G. Israelian, L. Suarez-Andres
The Instituto de Astrofisica de Canarias

E. Gorbovskoy, V. Lipunov, N.Tyurina, D. Vlasenko, V.Kornilov, 
P.Balanutsa, A.Kuznetsov, D. Vlasenko
Lomonosov Moscow State University, Sternberg Astronomical Institute

O. Gress, K. Ivanov, N.M. Budnev, V.A. Poleshchuk, S.A. Yazev
Irkutsk State University

V.Yurkov, Yu.Sergienko, A.Gabovich, E.Sinyakov
Blagoveschensk Educational State University, Blagoveschensk

report on behalf of the MASTER Team:

MASTER II  robotic telescope (MASTER-Net: http://observ.pereplet.ru, 
Lipunov et al., "MASTER Global Robotic Net", Advances in Astronomy, 2010, 
34917111)  located in IAC was pointed to the  GRB151215A (Gibson et al. 
GCN 18691) 18 sec after notice time and 33 sec after trigger time at 2015-12-15 03:02:05 
UT with 10s exposition in two perpendicular polarization  planes.
We detect  OT  (Cenko et al GCN 18691, Wiseman et al. GCN 18694)  in first 
image with magnitude 17.8 +- 0.5 at a growing stage (midle time 38 sec 
after trigger).
We definetely see OT on all images  till 1500-th second.

The GRB optical light curve have a maximum at third image (110 s after 
triger time) with 17.0 +- 0.1 mag.
The automatic light curve in one polarization available here
http://master.sai.msu.ru/static/GRB151215A_v1.png
All magnitudes are unfiltered (0.2B+0.8R) with respect to number USNO B1.0 
stars.

This is preliminary results.
The message may be cited.
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