[vsnet-grb-info 15208] GRB 140629A: MASTER-Net preliminary light curve

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  16500
SUBJECT: GRB 140629A: MASTER-Net preliminary light curve  
DATE:    14/07/01 15:21:21 GMT
FROM:    Vladimir Lipunov at Moscow State U/Krylov Obs  <gcncirc at observ.inetcomm.ru>

E. Gorbovskoy   (Lomonosov Moscow University)
V. Krushinski   (Ural Federal State University)
M. Pruzhinskaya (Lomonosov Moscow University)


P.Balanutsa,  A.Kuznetsov, V.V.Chazov, N.Tyurina, D.Denisenko
Lomonosov Moscow State University,
Sternberg Astronomical Institute, Moscow State University


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


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

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

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

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)

Three MASTER system telescopes located in Blagoveshchensk, Tunka and
Kislovodsk have observed GRB140629A (Lien et al., GCN 16477) from 33
seconds till ~9 hours after the trigger. MASTER II robotic telescope
(MASTER-Net: http://observ.pereplet.ru) located in Blagoveschensk was
pointed to GRB140629A 15 sec after notice time and 33 sec after
trigger time at 2014-06-29 14:18:03.188 UT and found OT in SWIFT
error-box. MASTER II Tunka was pointed to GRB140629A 78 sec after
trigger time at 2014-06-29 14:18:48.102 UT on the evening twilight sky
(Sun ~5 d. below horizon) with dark sky observations starting ~ 50 min
after trigger time. MASTER II Kislovodsk was pointed to GRB140629A
~3.2 hours after the trigger directly after the Sun set and weather
conditions became suitable.

The preliminary light curve is available here:
http://master.sai.msu.ru/static/GRB/GRB140629A_slope2.png

The optical transient (Lien et al., GCN 16477; Yurkov et al., GCN
16478; Moskvitin et al., GCN 16489; Bikmaev et al., GCN 16482; Masi,
GCN 16483; Maehara, GCN 16484; Malesani et al., GCN 16485; Sonbas et
al., GCN 16486 etc.) has a maximum at ~ 150 sec. after the burst,
reaching 13.8 mag, after which it shows a power law decay. The power
law index (alpha) from 200 to 10000 seconds after the trigger is 1.12
+- 0.1  (F ~ t^-alpha).

There was no polarization more than 3% discovered on afterglow 
stage.