[vsnet-grb-info 11839] GRB 120404A: MASTER OT observations
GCN Circulars
gcncirc at capella2.gsfc.nasa.gov
Sat Apr 7 01:00:58 JST 2012
TITLE: GCN CIRCULAR
NUMBER: 13230
SUBJECT: GRB 120404A: MASTER OT observations
DATE: 12/04/06 16:00:51 GMT
FROM: Vladimir Lipunov at Moscow State U/Krylov Obs <gcncirc at observ.inetcomm.ru>
E. Gorbovskoy, V. Lipunov, V.Kornilov, D.Kuvshinov, A.Belinski, N.Tyurina,
N.Shatskiy, P.Balanutsa, D.Zimnukhov, A.Kuznetsov, V.V.Chazov,
A.Kuznetsov,A.Sankovich
Moscow Lomonosov State University, Sternberg Astronomical Institute,
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.Zalozhnich, A. Popov, A. Bourdanov, A. Punanova
Ural Federal University
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 Blagoveschensk was pointed to the GRB120404A 24 sec after
notice time and 71 sec after GRB time at 2012-04-04 12:52:13.917 UT
(Yurkov et al., GCN 13210).
The observations was made with a full moon and at high zenith distance.
We see an OT (G. Stratta et. al., GCN 13208) on 3 single and some coadd
images. First time the OT seen at coadd of six first images set with
magnitude about 16.8. After this time the object was decay below 17.5
mag for an hour. The OT have a flash to 16.9 mag in our unfiltered band
(0.8R+0.2B) ~ 1 h after trigger time.
The detail imformation about observations in a table 1.
Table 1.
T_mid UT | T-T_grb sec.| Exptime | Coadd | Mag | err.mag
---------+-------------+---------+--------+------+--------
12:55:25 | 263 | 180 | 6 | 16.8 | 0.3
13:46:14 | 3311 | 180 | 1 | 17.2 | 0.4
13:49:40 | 3517 | 180 | 1 | 16.9 | 0.4
13:56:33 | 3930 | 180 | 1 | 17.1 | 0.4
14:10:22 | 4760 | 900 | 5 | 17.8 | 0.3
14:36:13 | 6311 | 1800 | 10 | 18.1 | 0.3
15:21:03 | 9001 | 1800 | 10 | 18.2 | 0.3
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