GCN Circular 14013
Subject
GRB 121128A: RAPTOR Detection During Gamma-Ray Emitting Interval
Date
2012-11-28T16:42:41Z (11 years ago)
From
James Wren at LANL <jwren@nis.lanl.gov>
J. Wren, W.T. Vestrand, P. Wozniak, and H. Davis,
of Los Alamos National Laboratory report:
The RAPTOR network of robotic optical telescopes made follow-up observations
of Swift trigger 539866 (Oates, et al., GCN 14007). Our narrow-field
RAPTOR-S telescope located in Los Alamos, NM, began imaging at 05:06:12.6 UT,
35.4 s after the Swift BAT trigger and during the period that the BAT was
still detecting gamma-ray emission (Palmer, et al., GCN 14011). Starting
during the gamma-ray emitting interval we detect a brightening counterpart
that ultimately peaks at T+75s with a R-band equivalent magnitude of
approximately 13.9 before beginning to fade. Our unfiltered images are
calibrated to the USNO-B1 R-band.