[vsnet-grb-info 14398] GRB 140105A: MASTER-Net early optical observations and time correction

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  15712
SUBJECT: GRB 140105A:  MASTER-Net early optical observations and time correction
DATE:    14/01/09 17:35:59 GMT
FROM:    Vladimir Lipunov at Moscow State U/Krylov Obs  <gcncirc at observ.inetcomm.ru>

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

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

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

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

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 VWF robotic very wide field cameras (FOV=2x384 square degrees, 
D=72mm, f/1.2, 1 pix = 22 arcsec, http://observ.pereplet.ru) installed on 
MASTER-II robotic telescope syncronously covered ~15% part of 3 sigma 
FERMI-GBM error box (Xiong et al., GCN 15688). No credible transients have 
been found on our images. The 3 sigma unfiltered upper limit is 10.6.
MASTER-II robotic telescope (MASTER-Net: http://observ.pereplet.ru) 
located in Kislovodsk was pointed to the GRB140105A 21 sec after notice 
time and 45 sec after trigger time at 2014-01-05 01:33:46 UT.

After pointing by FERMI alert we cover 90% of 1-sigma and 70% of 3-sigma 
FERMI-GBM error box.  We didn't find new object in error box on single and 
coadd images. The 3 sigma upper limit on single 5 seconds exposure image 
is 10.6 and 12.0 on coadd of 24 images with total exposure 120 seconds.
The positions of all iPTF optical afterglow candidates (Singer et al., GCN 
15686) are covered by out cameras since 48 sec. after the trigger but 
there are no flares up to 10.6 mag. on their place.

The movie is available here 
http://master.sai.msu.ru/static/GRB/GRB140105A/GRB140105A.gif

The map of error box and our FOV is available at 
http://master.sai.msu.ru/static/GRB/GRB140105A/GRB140105A_map.png

The pointing time informations in our previous telegram Gorbovskoy et al. 
GCN 15692 are not correct. We apologize for this inaccuracy.



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