TITLE: GCN CIRCULAR NUMBER: 38558 SUBJECT: GRB 241213A: LCOGT Optical Upper Limits DATE: 24/12/13 14:28:54 GMT FROM: Robert Strausbaugh at Eastern Illinois University rstrausbaugh@eiu.edu
R. Strausbaugh (Eastern Illinois University), A. Cucchiara (NASA) report on behalf of a larger collaboration:
We observed the Swift GRB 241213A field (Gupta et al., GCN 38547) with the LCOGT 1-meter Sinistro instrument at the McDonald Observatory USA site, on December 13, from 06:49 to 07:19 UT (corresponding to 4.50 to 5.00 hours after the GRB trigger time) with the sdss r and i filters.
We performed a series of 3x300s exposures in i-band and 2x300s in r-band. We do not detect a source within the Swift XRT enhanced error region (Osborne et al., GCN 38552) in either band, consistent with other optical upper limits (Lipunov et al., GCN 38548; Spiridonova et al., GCN 38550; Brivio et al., GCN 38553).
The following 5-sigma upper limits are calculated using the PanSTARRS catalog as reference:
r > 21.2 i > 21.5
These magnitudes are not corrected for galactic extinction.
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