GCN Circular 14202
Subject
GRB 130131B: CTIO 0.9-m optical upper-limits
Date
2013-02-13T18:57:53Z (11 years ago)
From
Francisco Virgili at Liverpool John Moores U <fjv@astro.livjm.ac.uk>
D. Calder�n Espinoza, B. Indahl, L. Paredes Alvarez, C. Kaleida (CTIO), and F. J. Virgili (LJMU) report:
"As part of the REU/PIA student program at the Cerro Tololo Inter-American Observatory (CTIO) we observed
GRB 130131B (Siegel et al., GCN 14159) with the SMARTS 0.9-m telescope beginning 11.6 hrs after the Swift
trigger. No optical counterpart is detected within the XRT error circle to the following conservative limits:
Midtime of exposure Exposure time Filter Magnitude
--------------------------------------------------------------------------
12.7 hr 7x450s R > 20.7
12.8 hr 7x450s V > 20.3
--------------------------------------------------------------------------
Magnitudes are calibrated using nearby USNOB-1 (R-band) and NOMAD (V-band) stars."