[vsnet-grb-info 13417] GRB 130603A: SON optical observations

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  14750
SUBJECT: GRB 130603A: SON optical observations
DATE:    13/06/04 06:39:09 GMT
FROM:    Arto Oksanen at Nyrola Obs., Finland  <oksanen at nyrola.jklsirius.fi>

P. Kehusmaa, A. Oksanen and C. Harlingten report on behalf of 
the Searchlight Observatory Network:

On 2013 June 03, starting at 06:42 UT (T0+42.5 minutes), we observed 
the field of GRB130603A (Melandri et al., GCN Circ. 14731) with 
the 0.40 m NM1 telescope located in New Mexico, USA with Apogee Alta 
U42 CCD for 3x120 seconds using the V filter and 7x120 seconds unfiltered. 
The afterglow reported by Melandri et. al. (GCNC 14732) is detected in 
all unfiltered images and in the coadded V band image.
 
We report following differental photometry:

UTC (mid)            T0+(h)    Mag     Err   Filter
----------------------------------------------------------
2013-06-03T06:44:21  0.75      18.78   0.13  V 
2013-06-03T06:59:55  1.00      18.79   0.07  clear
----------------------------------------------------------

The reference magnitude from the nearby USNO B1.0 star (1729-0016610) 
with R=16.49.

A snapshot showing our coadded unfiltered image can be found at the URL
http://pilvi.dyndns.org/arto/GRB130603A_C_840s.jpg