GRB 080330A
GCN Circular 7538
Subject
GRB 080330A: ROTSE-III Detection of Optical Counterpart
Date
2008-03-30T04:04:25Z (17 years ago)
From
Brad Schaefer at LSU <schaefer@grb.phys.lsu.edu>
B. E. Schaefer (Louisiana State) and T. Guver (U Istanbul) report on
behalf of the ROTSE collaboration:
ROTSE-IIIb, located at McDonald Observatory, Texas, responded to GRB
080330A (Swift trigger 308041). The first image was at 03:41:39.2 UT, 22.4
s after the burst (7.2 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:
11:17:04.5 +30:37:24.0 (J2000),
with positional uncertainty of 1" or better. This is inside the XRT error
box. The object is roughly 17.5 magnitude, and it declined immediately
only to rise again to a peak at 16.9 mag roughly ~300 seconds after the
burst. A jpeg image is available at
http://www.rotse.net/images/gsb308041_3b00_img.jpg
Continuing observations are in progress.
GCN Circular 7542
Subject
GRB 080330A: PAIRITEL Infrared Detections
Date
2008-03-30T05:22:44Z (17 years ago)
From
Josh Bloom at UC Berkeley <jbloom@astron.berkeley.edu>
J. S. Bloom (UC Berkeley) and D. L. Starr (UCB; LCOGT) report:
"We began observing the field of GRB 080330A (Mao et al. GCN 7537) at
2008-03-30 03:53:24.8 UT with PAIRITEL. In a stack of the first 33
frames (each 7.8 sec) exposures, consistent with the BAT/XRT/UVOT
(7537, also Burrows et al. GCN 7541) and groundbased position (7536,
7539, 7538), we find a point source in JHKs bands. The preliminary
photometry yields:
# t (MJD) terr (day) filt mag merr
54555.164606 0.001499 h 15.33 0.04
54555.164606 0.001499 k 14.59 0.04
54555.164606 0.001499 j 16.00 0.04
We find a position relative to 2MASS of (700 mas rms uncertainty):
ra = 11:17:04.496 dec = +30:37:23.53 J2000
Observations are ongoing."