[vsnet-grb-info 8148] GRB 090715B: MASTER optical limit

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  9681
SUBJECT: GRB 090715B: MASTER optical limit
DATE:    09/07/16 13:32:17 GMT
FROM:    Vladimir Lipunov at Moscow State U/Krylov Obs  <gcncirc at observ.inetcomm.ru>

D.Kuvshinov, V. Lipunov, V.Kornilov,  E. Gorbovskoy,
A.Belinski,  A. Krylov, N.Shatskiy, N.Tyurina, P.Balanutsa, V.V.Chazov, 
P.V.Kortunov
Sternberg Astronomical Institute, Moscow State University

A. Tlatov, A.V. Parkhomenko,
Kislovodsk Solar Station of the Pulkovo Observatory

V.Krushinski, I.Zalognikh, T.Kopytova, Alexander Popov
Ural State University, Kourovka

S.Yazev, K.Ivanov
Irkutsk State University



MASTER  robotic telescope (MASTER-Net: http://observ.pereplet.ru, 
355 mm, 6 square degrees, 16Mpx Apogee CCD) located
at Vostrykovo (Moscow) responded to the  GRB 090715B (Swift 
trigger 357512,  L. Vetere , GCN 9668), producing images
beginning 19 s after the GCN notice time. An automated response took
the first image at 21:11:18 UT, 8m 04s after the  burst, under summer 
Moscow sky.
We have 160 images with 30 sec exposition each.
These unfiltered images are calibrated relative to USNO 08.R+0.2B (Usno 
A2.0).

Individual images have limiting magnitudes ranging from 17.8-17.0; we
set the following specific limits.

GRB_time     start UT       end UT      t_exp(s)   mlim     Coadd?
-------------------------------------------------------------------

484 - 514s    21:11:18      21:41:18        30      17.8       no
484 - 699s    21:11:18      21:14:57        90      18.5        3 
484 - 6699S   21:11:18      22:54:27      3330      20.0       111



Robot do not detect OT with limit 20.0 .

The message may be cited.

mailto: lipunov at sai.msu.ru