GCN Circular 15861
Subject
GRB 140215A: RAPTOR Observations During Gamma-Ray Emitting Interval
Date
2014-02-19T15:35:54Z (10 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 586680 (Markwardt, et al., GCN 15837). Our narrow-field
instruments in Los Alamos, NM, began imaging at 04:07:37.21 UT,
26.9 seconds after the BAT trigger time. We do not detect the counterpart
in our three initial images, with limiting magnitudes near 14.0. The
counterpart then rises above our detection limit and reaches peak brightness
at magnitude 13.5 around T-Tbat=90s. The counterpart then plateaus for
a period of about 50 seconds before beginning a power-law decay. Our
unfiltered observations were calibrated to the USNO-B1 R-band. The following
table summarizes some of our early observations.
t-mid(s) exp(s) mag error
------------------------------------
29.45 5 >14.0
56.85 5 13.8287 0.033
83.85 5 13.5381 0.011
128.95 10 13.5608 0.008
283.35 10 14.3725 0.024
470.75 30 14.9185 0.020