GCN Circular 17402
Subject
GRB 150203A: RAPTOR Limits Beginning at the Gamma-Ray Emitting Interval
Event
Date
2015-02-04T15:53:14Z (12 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 observations of Swift trigger 629578 (Ukwatta, et al., GCN 17377). Our narrow-field instruments located in Los Alamos, NM, USA, arrived on target 4.6 s after receipt of the notice (T+30.9 s after the BAT trigger time). No optical counterpart is detected within the Swift XRT counterpart location. Typical 3-sigma limiting magnitudes for our initial 5 s exposures were R~16.6 and I~15.7 based on comparision to the USNO-B1 R-band catalog.
The burst location was also within the field of view of our wide-field sky monitors during the gamma-ray emitting interval. No optical counterpart is detected in any of our wide-field monitor images. Typical 3-sigma unfiltered limiting magnitudes during this period were V~9.7 based on comparison to the
Tycho-2 V-band catalog.