[vsnet-grb-info 7896] GRB 090530A: ROTSE-III Detection of Optical Counterpart

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  9439
SUBJECT: GRB 090530A: ROTSE-III Detection of Optical Counterpart
DATE:    09/05/30 03:30:24 GMT
FROM:    Heather Flewelling at IfA/Hawaii  <flewelling.heather at gmail.com>

H. Flewelling (IfA), B. E. Schaefer (Louisiana State), Shashi Pandey (UMich)
report on behalf of the ROTSE collaboration:

ROTSE-IIIb, located at McDonald Observatory, Texas, responded to GRB 090530A
(Swift trigger 353567). The first image was at 03:18:35.8 UT, 17.4 s after
the burst (6.8 s after the GCN notice time). The unfiltered images are
calibrated relative to USNO A2.0. We detect a new object, not visible in the
DSS (second epoch), with coordinates:

     11:57:40.5      +26:35:37.9    (J2000), with positional uncertainty of
1" or better

start UT    	mag     mlim(of image)
----------------------------------
03:18:42.7     16.0     16.2

A jpeg image is available at
http://www.rotse.net/images/gsb353567_3b00_img.jpg Note that the object
marked 48 is the candidate in question.

Continuing observations are in progress.