[vsnet-grb-info 13073] GRB 130420A: T21 optical observations

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  14410
SUBJECT: GRB 130420A: T21 optical observations
DATE:    13/04/20 13:06:20 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 130420A optical afterglow at iTelescope 
Observatory T21 (Mayhill, New Mexico) 0.43-m/6.8 astrograph
and FLI ProLine PL6303E CCD. Two unfiltered images with 600
sec exposure time were made.

The afterglow was detected at following position RA 13:04:25.51
and DEC +59:25:27.2.

The following magnitudes were obtained from the observations using 
NOMAD1 1494-0215473 (R=16.220) as the comparison:

Tmid(sec)+T0  Filter         Exp. time   Mag           Mag err.  Limit
7258                unfiltered   600            19.49CR   0.20        20.60
7885                unfiltered   600            19.61CR   0.24        20.48