[vsnet-grb-info 14220] GRB 131127B: MASTER-Net optical observations

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  15534
SUBJECT: GRB 131127B: MASTER-Net  optical observations 
DATE:    13/11/28 15:22:44 GMT
FROM:    Vladimir Lipunov at Moscow State U/Krylov Obs  <gcncirc at observ.inetcomm.ru>

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

E. Gorbovskoy, V. Lipunov, V.Kornilov, D.Kuvshinov, A.Belinski, N.Tyurina, 
N.Shatskiy, P.Balanutsa, D.Zimnukhov, A.Kuznetsov, V.V.Chazov, D.Denisenko, 
Sternberg Astronomical Institute, Moscow 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  GRB131127.59 73 sec after GRB time at 
2013-11-27 14:13:31.093 UT.

Fortunately, the central part (42%) of the IPN error box (Golenetskii et 
al., GCN 15529) was covered by first MASTER image (10s exposure). 
Unfortunatelly, observations was done at the very high zenit distance (~85 
degrees).

We haven`t  found optical transient.
The 5-sigma upper limit has been about 14.1 mag
We have 4 images (the one of the tube was under horizont):

Id (image)     Coord	             Pro.type     time    Exp.time  Limit

587443  20h 19m 27.4s -02d 51m 25s   Alert       14:13:31    10      14.1
587444  20h 19m 27.3s -02d 51m 31s   Alert       14:14:29    30      15.0
587446  20h 19m 27.0s -02d 51m 41s   Alert       14:15:52    40      14.8
587448	20h 19m 27.1s -02d 51m 42s   Alert 	 14:17:38    60      15.0

The fist image (FOW = 2x2 degrees) with IPN error box is available at 
http://master.sai.msu.ru/static/GRB/grb131127_IPN.jpeg .
The reduction is continued.
The message may be cited.