GCN Circular 18481
Subject
GRB 151027A: P60 afterglow confirmation and rebrightening
Date
2015-10-27T05:57:03Z (9 years ago)
From
Daniel Perley at Caltech <dperley@astro.caltech.edu>
D. A. Perley (DARK/NBI) and S. B. Cenko (NASA/GSFC) report:
The Palomar 60-inch robotic telescope responded automatically to the
alert for GRB 151027A (Maselli et al., GCN151027A) and began a sequence
of i, r, and z-band imaging at 04:00:49 UT, 145 seconds after the BAT
trigger. We identify a very bright afterglow consistent with the UVOT
and KAIT (Zheng et al., GCN18479) positions in all filters.
The preliminary afterglow light curve shows a slow rise to a peak at
about ~5 minutes after the GRB trigger, then slowly fades by about 1
magnitude between then and approximately 30 minutes after the trigger.
Over the next 20 minutes it then rapidly rebrightens by about 0.7
magnitude. Little or no fading is seen after that point (through to at
least 90 minutes after the trigger.)
Continued monitoring is encouraged, and should remain possible even from
small telescopes for quite some time. High-resolution spectroscopy is
also strongly encouraged.