GCN Circular 14770
Subject
GRB 130603B: MASTER-Net early observations and optical sloap limit
Event
Date
2013-06-05T17:11:24Z (12 years ago)
From
Vladimir Lipunov at Moscow State U/Krylov Obs <gcncirc@observ.inetcomm.ru>
Maria Pruzhinskaya, D.Denisenko, E. Gorbovskoy, V. Lipunov, V.Kornilov,
D.Kuvshinov, N.Tyurina, N.Shatskiy, P.Balanutsa, D.Zimnukhov, A.Kuznetsov,
V.V.Chazov
Sternberg Astronomical Institute, Lomonosov Moscow State University
K.Ivanov, S.Yazev, N.M.Budnev, O.Gres, O.Chuvalaev, V.A.Poleshchuk
Irkutsk State University, Irkutsk
V.Yurkov, Yu.Sergienko, D.Varda, E.Sinyakov, A.Gabovich
Blagoveschensk Educational State University, Blagoveschensk
A. Tlatov, A.V. Parhomenko, D. Dormidontov, V.Sennik
Kislovodsk Solar Station of the Pulkovo Observatory
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 II robotic telescope (MASTER-Net: http://observ.pereplet.ru)
located in Tunka was pointed to GRB130603B 35 sec after Notice time
and 52 sec after Trigger time (Melandri et al., GCN 14735) in two
mutually perpendicular polarizations.
We didn't find OT at the position reported by Levan et al., GCN 14742
and A. de Ugarte Postigo et al., GCN 14743.
Our photometry (upper limits) during the first 20 minutes until the
clouds started coming in is as follows:
t_UT Exp T-T_trig Limit Filter Tube
-------------------------------------------------------
2013-06-03 15:50:06 10 52 15.4 P| EAST
2013-06-03 15:50:07 10 53 15.1 P- WEST
2013-06-03 15:51:06 20 112 15.9 P| EAST
2013-06-03 15:51:07 20 113 15.8 P- WEST
2013-06-03 15:52:08 30 174 16.2 P| EAST
2013-06-03 15:52:08 30 174 16.1 P- WEST
2013-06-03 15:53:18 50 244 16.7 P| EAST
2013-06-03 15:53:19 50 245 16.7 P- WEST
2013-06-03 15:55:01 70 348 16.7 P| EAST
2013-06-03 15:55:02 70 349 16.6 P- WEST
2013-06-03 15:56:48 90 454 17.2 P| EAST
2013-06-03 15:56:49 90 455 16.9 P- WEST
2013-06-03 15:58:57 120 583 17.6 P| EAST
2013-06-03 15:58:58 120 584 17.5 P- WEST
2013-06-03 16:01:43 150 749 18.0 P| EAST
2013-06-03 16:01:43 150 749 17.6 P- WEST
2013-06-03 16:04:54 180 940 18.0 P| EAST
2013-06-03 16:04:54 180 940 17.5 P- WEST
The OT upper limit available on the plot :
http://master.sai.msu.ru/static/OT/grb130306B.gif
We have tried to compare our data with the photometry from the large
telescopes in the filters similar to ours. In fact, we have used the
observations in r filter.
The following data have been published so far.
Afterglow:
t+5.8 hours r=20.94 WHT Levan et al., GCN 14742
t+5.8 hours r=20.9 NOT A. de Ugarte Postigo et al., GCN 14743
t+7.5 hours r=21.2 Gemini-South Cucchiara et al., GCN 14748
Large aperture to include both objects:
t+12.2 hours r'=20.8 P60 (Palomar 60 inch) Cenko et al., GCN 14761
t+14.78 hours r'=20.78 RATIR (1.5m Harold Johnson) Eleonora Troja et
al., GCN 14764
We were not able to use the Swift UVOT data in the white light (De
Pasquale et al., GCN 14759) since their exact times of mid-exposures
are not easy to determine.
Obviously, the last two points involve the host galaxy.
In order to constrain the slope we have used the data from WHT, NOT
and Gemini South.
The results are presented here:
http://master.sai.msu.ru/static/OT/grb130306B_all.gif
Thus, supposing the power law of the fading afterglow
F ~ t^-alpha
we are providing the following limitation:
alpha < 0.84.
The message may be cited.