TITLE: GCN CIRCULAR NUMBER: 38605 SUBJECT: GRB 241218A: LCOGT Optical Upper Limit DATE: 24/12/18 04:35:43 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 241218A field (Williams et al., GCN 38601) with the LCOGT 1-meter Sinistro instrument at the Teide Tenerife site, on December 18, from 03:45 to 04:17 UT (corresponding to 3.62 to 4.15 hours after the GRB trigger time) with the sdss r and i filters.
We performed a series of 3x300s exposures in i-band and r-band. We do not detect a source within the Swift XRT enhanced error region (Beardmore et al., GCN 38604) in either band.
The following 5-sigma upper limits are calculated using the PanSTARRS catalog as reference:
r > 21.2 i > 20.9
These magnitudes are not corrected for galactic extinction.
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