[vsnet-grb-info 13887] GRB 130907A: T21 optical observations

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  15201
SUBJECT: GRB 130907A: T21 optical observations
DATE:    13/09/08 22:35:10 GMT
FROM:    Veli-Pekka Hentunen at Taurus Hill Obs,A95  <veli-pekka.hentunen at kassiopeia.net>

Veli-Pekka Hentunen, Markku Nissinen, Harri Vilokki and Tuomo Salmi (Taurus
Hill Observatory, Varkaus, Finland) report:

We have detected GRB 130907A optical afterglow at iTelescope observatory
T21 (Mayhill, New Mexico) 0.43-m/6.8 astrograph and FLI-PL6303E CCD. 
Six unfiltered images and seven photometric R filter images with 300 sec
were made.

The afterglow was detected at the following position RA 14:23:34.06 and
DEC +45:36:27.1 J2000.

The following magnitudes were obtained from the observations using 
NOMAD1 1356-0257141 (R=15.220) as a comparison star:

Tmid(h)+T0     Filter             Exp. time     Mag             Mag err. 
4.70                 unfiltered        3x300         20.00CR       0.49
5.22                 R                   7x300         20.06R          0.47
5.77                 unfiltered        3x300         20.36CR       0.47