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GCN Circular 16653

Subject
GRB 140801A (FERMI trigger 428612396): MASTER brigth OT discovery
Date
2014-08-01T20:52:09Z (10 years ago)
From
Vladimir Lipunov at Moscow State U/Krylov Obs <gcncirc@observ.inetcomm.ru>
E. Gorbovskoy, V. Lipunov, D.Denisenko, M.Pruzhinskaya, V.Kornilov, 
D.Kuvshinov, A.Belinski, N.Tyurina, N.Shatskiy, P.Balanutsa, D.Zimnukhov, 
A.Kuznetsov, V.V.Chazov, A.Sankovich
Lomonosov Moscow State University,
Sternberg Astronomical Institute, Moscow State University

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.Krushinsky, I.Zalozhnih,  A. Popov
Ural Federal University, Yekaterinburg, 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  GRB140801A (FERMI trig. 428612396) 54 
sec after notice time and 100 sec after trigger time at 2014-08-01 19:01:33 UT
in two polarizations.

MASTER-Tunka auto-detection system discovered bright OT 
source at (RA, Dec) = 02h 56m 16.44s +30d 56m 16.8s on 2014-08-01.79376 
UT. The OT unfiltered magnitude is 14.6m (limit 18.3m) within FERMI 
error-box  (trig. N 428612396).


Preliminary automatic photometry and astrometry

Date         Time           Ra                Dec       Mag
2014-08-01 19:01:31.886	02h 56m 16.42s , +30d 56m 16s.8	14.64
2014-08-01 19:03:02.863	02h 56m 16.43s , +30d 56m 17s.0	15.72
2014-08-01 19:04:38.384	02h 56m 16.43s , +30d 56m 17s.0	16.30


Our band is well described by a parity 0.8R+0.2B (USNO B1).

The discovery and reference images are available at:
http://master.sai.msu.ru/static/GRB/GRB140801_FERMI.png


The 5-sigma upper limit has been about 18.53mag
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