[vsnet-grb-info 12856] GRB 130131B: CTIO 0.9-m optical upper-limits
GCN Circulars
gcncirc at capella2.gsfc.nasa.gov
Thu Feb 14 03:58:01 JST 2013
TITLE: GCN CIRCULAR
NUMBER: 14202
SUBJECT: GRB 130131B: CTIO 0.9-m optical upper-limits
DATE: 13/02/13 18:57:53 GMT
FROM: Francisco Virgili at Liverpool John Moores U <fjv at astro.livjm.ac.uk>
D. Calderón 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."
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