GCN Circular 2915
Subject
GRB041226: ROTSE-III Optical Observations
Event
Date
2004-12-27T03:02:30Z (21 years ago)
From
Eli Rykoff at U of Michigan/ROTSE <erykoff@umich.edu>
E. Rykoff (U. Michigan) reports on behalf of the ROTSE collaboration:
ROTSE-IIIb, located at McDonald Observatory, Texas, responded to Swift
GRB041226 (GCN #2914). An automatic response was initiated during early
twilight hours. The first usable image taken at 27 Dec. 00:46:47 UT,
4.2 hours after the burst. We took 300 20-s exposures. All the images
were taken with >99% moon illumination. The unfiltered images were
calibrated relative to USNO A2.0. Individual images have limiting
magnitudes improving from 15 to 16.8 as the sky darkened. Comparison to
DSS (second epoch) reveals no new sources within the 3-sigma error
circle to a limiting magnitude of 16.1 for stacks of 10 images taken 4.2
hours after the burst and 17.7 for stacks of 10 images taken 5 hours
after the burst.