[vsnet-grb-info 4355] GRB 070224: MASTER-Net refind analysis

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  6140
SUBJECT: GRB 070224: MASTER-Net refind analysis
DATE:    07/02/24 22:53:17 GMT
FROM:    Vladimir Lipunov at Moscow State U/Krylov Obs  <gcncirc at observ.inetcomm.ru>

V. Lipunov, V.Kornilov, D.Kuvshinov,  A.Belinski, E.Gorbovskoy,
A.Krylov, N.Shatskiy, N.Tyurina,G.Borisov, A.Sankovich, V.Vladimirov, 
V.Vibornov, A.Kuznetsov
Sternberg Astronomical Institute, Moscow Union 'Optic'

A. Tlatov, I.Golubov
Kislovodsk Solar Station of the Pulkovo observatory

MASTER Very Wide Field Camera located at Kislovodsk Solar Station
(http://observ.pereplet.ru, D=70 mm, 420 square degrees, 11 Mpixel's CCD) 
has moved to the Swift-BAT trigger 261880 and it has taken a series of 5s
exposures starting 2 s after notice arrivel time at  20:29:38.285 UT under 
good weather  condition and waxing moon.

We note that the GBR position (J. L. Racusin et al. GCN Circ No. 6137) was
at 4 degrees outside of the our field of view.

We note that the VWF camera continuously takes frames during the night.
These unfiltered images are calibrated relative to USNO A2.0 (R).
The robot not find OT-candidate.

T-Tgrb     Mean Time     Limit   Coadd?   Exp

100s        100.5s        11.0     no      5s
100s        130 s         12.0     yes   12x5s
100s        222 s         13.3     yes   47x5s

MASTER  robotic system (D=355mm, http://observ.pereplet.ru, Moscow) 
responded to 
GRB070224  (GRB_TIME is 2007-02-24 20:27:58.21).
The first image was at 2007-02-24 20:30:04 UT, 51s after notice arrivel time 
and 00:02:05.79  after the GRB time at large zenit distance.
The unfiltered image is calibrated relative to USNO A2.0 (0.8 R + 0.2 B).
The robot not find OT-candidate.


T-Tgrb     Mean Time     Limit   Coadd?  Exp

125s        140s         16.2     no     30s
125s        924s         18.0    yes     31x30s


This message can be cited.
Mailto: lipunov at sai.msu.ru