[vsnet-grb-info 10817] GRB 110801A: MASTER OT observations
GCN Circulars
gcncirc at capella2.gsfc.nasa.gov
Wed Aug 3 02:32:40 JST 2011
TITLE: GCN CIRCULAR
NUMBER: 12238
SUBJECT: GRB 110801A: MASTER OT observations
DATE: 11/08/02 17:32:35 GMT
FROM: Vladimir Lipunov at Moscow State U/Krylov Obs <gcncirc at observ.inetcomm.ru>
A.V. Parhomenko, A. Tlatov, D. Dormidontov
Kislovodsk Solar Station of the Pulkovo Observatory
K.Ivanov, V.A.Poleshchuk, S.Yazev, N.M.Budnev, O.Gres,
O.Chuvalaev,E.Konstantinov,
Irkutsk State University
E. Gorbovskoy, V. Lipunov, V.Kornilov, D.Kuvshinov, A.Belinski, N.Tyurina,
N.Shatskiy, P.Balanutsa, V.V.Chazov, P.V.Kortunov, A.Kuznetsov, D.Zimnukhov, M.
Kornilov,A.Sankovich
Sternberg Astronomical Institute, Moscow State University
V.Krushinski, I.Zalozhnich, T.Kopytova, A. Popov
Ural State University, Kourovka
V.Yurkov, Yu.Sergienko, D.Varda, I.Kudelina
Blagoveschensk Educational State University, Blagoveschensk
MASTER II robotic telescope (MASTER-Net: http://observ.pereplet.ru)
located in Tunka(Siberia) was pointed to the GRB110801A 101 sec after GRB
time at 2011-08-01 19:51:23 UT. Unfortunatelly the objects was not in
focus because recently photometer modification. On our first (20s
exposure) set we haven`t found optical transient within SWIFT error-box
(De Pasquale et al., GCN 12228).
The 3-sigma upper limit has been about 14.0 mag (white+polarizator).
MASTER II robotic telescope (MASTER-Net: http://observ.pereplet.ru) located
near Kislovodsk (Caucasus Mountains) closed roof 20 min before
trigger due to cloudy condidtions. The telescope was repointed to the
GRB110901A only 47 min 40 sec after trigger time at 2011-08-01 20:37:22 UT.
We found OT at UVOT postion (De Pasquale et al., GCN 12228).
The results of our photometry are:
Time_Start T_mean-T_trig exp time m error Band
UT s s
20:37:22 2950 180 16.13 0.06 R
20:44:29 3377 180 16.12 0.06 R
20:48:01 3589 180 16.29 0.08 R
20:48:01 3589 180 16.03 0.06 White
20:51:24 3792 180 16.43 0.06 R
20:51:24 3792 180 16.19 0.06 White
23:20:14 12722 180 17.75 0.10 R
The magnitudes in the table are not corrected for the Galactic extinction
due to the reddening of E(B-V) = 0.08 in the direction of the burst
(Schlegel et al. 1998).
The power low index (F~t^-aplha) apha ~1.0+-0.1 during this
observations in R-band.
The message may be cited.
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