[vsnet-grb-info 13120] GRB 130427A: iTelescope T11 optical observations

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  14457
SUBJECT: GRB 130427A: iTelescope T11 optical observations
DATE:    13/04/27 12:26:03 GMT
FROM:    Veli-Pekka Hentunen at Taurus Hill Obs,A95  <veli-pekka.hentunen at kassiopeia.net>

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

We have detected GRB 130427A optical afterglow at iTelescope 
observatory T11 (Mayhill, New Mexico) 0.50-m/6.8 astrograph and FLI 
ProLine PL11002M CCD. Three unfiltered and three photometric V filter 
images with 120 sec exposure time were made.

The afterglow was detected at following position RA 11:32:32.83
and DEC +27:41:56.4

The following magnitudes were obtained from the observations using
NOMAD1 1176-0248446 (R=13.520, V=13.120) as the comparison:

Tmid(sec)+T0   Filter         Exp. time    Mag          Mag err. 
4597              unfiltered     120            15.02CR     0.04
4743              unfiltered     120            15.09CR     0.05
4887              unfiltered     120            15.11CR     0.05
5438              V                120            14.89V       0.04
5582              V                120            14.89V       0.04
5726              V                120            14.86V       0.04