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GCN Circular 15932

Subject
GRB 140304A: MASTER OT light curve
Date
2014-03-05T18:41:37Z (10 years ago)
From
Vladimir Lipunov at Moscow State U/Krylov Obs <gcncirc@observ.inetcomm.ru>
E. Gorbovskoy, V. Lipunov, M. Pruzhinskaya, D.Denisenko, V.Kornilov, N.Tyurina, 
P.Balanutsa, A.Kuznetsov, V.V.Chazov, D.Kuvshinov
Lomonosov Moscow State University, Sternberg Astronomical Institute

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

V.Yurkov, Yu.Sergienko, D.Varda, E.Sinyakov
Blagoveschensk Educational State University, Blagoveschensk

A. Tlatov, A.V. Parhomenko, D. Dormidontov, V.Sennik
Kislovodsk Solar Station of the Pulkovo Observatory

V.Krushinski, I.Zalozhnih,  A. Popov
Ural Federal University, Kourovka

Hugo Levato and Carlos Saffe
Instituto de Ciencias Astronomicas, de la Tierra y del Espacio (ICATE)

Claudio Mallamaci, Carlos Lopez and Federico Podest
Observatorio Astronomico Felix Aguilar (OAFA)

MASTER II  robotic telescope (MASTER-Net: http://observ.pereplet.ru)
located in Tunka was pointed to the  GRB140304A (Evans et. al GCN 15915) 
26 sec after notice time and 77 sec after trigger
time at 2014-03-04 13:23:49 UT.  We detect OT (Gorbovskoy et. al GCN 
15914) in two polarization bands during ~1 h while the source was brighter 
than our upper limit.
The preliminary photometry result available in table 1 and here 
http://master.sai.msu.ru/static/GRB/grb140304A.png  .

Table 1. Preliminary early GRB140304A observations.

T_start(JD)    T_trig-T_mid   Exptime   Mag1    Mag2   Coadd
2456721.05834       82            10    16.8    16.2    -
2456721.05931      172            30    17.2    16.9    -
2456721.06073      294            50    18.0    17.6    -
2456721.06142      358           120    18.1    17.6    2
2456721.06211      413            70    18.3    18.0    -
2456721.06724      894           580    18.5    18.5    4
2456721.08121      2070         1080    19.6    19.0    6
2456721.09812      3526         1080    19.9    19.4    6

Mag1 and Mag2 - Magnitude in two perpendicular polarizations.
The power low index alpha is 0.77+-0.05  (F ~ t-apha).


MASTER II  robotic telescope (MASTER-Net: http://observ.pereplet.ru) 
located in Blagoveschensk was pointed to the  GRB140304A  5 sec after 
notice time and 46 sec after trigger time at 2014-03-04 13:23:17 UT.
The observations  on this site made on bad weather conditions and on high 
zenith distance. The 5-sigma upper limit On our first (10s exposure) image 
has been about 13.0 mag.


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