[vsnet-grb-info 9424] GRB100628A : MOA optical upper limit

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  10904
SUBJECT: GRB100628A : MOA optical upper limit
DATE:    10/06/29 05:31:35 GMT
FROM:    Suzuki Daisuke at MOA-II  <dsuke at stelab.nagoya-u.ac.jp>

D. Suzuki, K. Omori, F. Hayashi, S. Kobara, H. Naito and T. Sako (STE Lab. , Nagoya Univ.)
on behalf of the MOA Collaboration repot :

We searched for an optical afterglow of GRB100628A (GCN 10895, S. Immler et al.)
starting from 08:16:43 UT on 2010 June 28 ( 3 minutes after the burst) 
with the MOA-II 1.8m telescope at Mt.John observatory in New Zealand.
In a single image of a 300 sec exposure with a wideband Red filter (center 
wavelength ~ 750nm and FWHM ~ 250nm), we did not find any object
within the error circle of the Swift XRT source position (GCN 10899, R.L.C. Starling et al.).
A 3 sigma upper limit is set in the I magnitude at 22.7 mag.   

This photometry was done by using the DoPhot and calibrated against the 
USNO-B1.0 catalog stars, and not corrected for the Galactic extinction.