GCN Circular 37142
Subject
GRB 240811A: LCOGT Optical Upper Limit
Date
2024-08-11T22:45:39Z (3 months ago)
From
Robert Strausbaugh at Eastern Illinois University <rstrausbaugh@eiu.edu>
Via
email
R. Strausbaugh (Eastern Illinois University), A. Cucchiara (NASA) report on
behalf of a larger collaboration:
We observed the Swift GRB 240811A (Beardmore et al., GCN 37136) field with the LCOGT 1-meter Sinistro instrument at the Teide Observatory, Tenerife site, on August 11, from 20:43 to 21:13 UT (corresponding to 6.60 to 7.10 hours after the GRB trigger time) with the sdss r and i filters.
We performed a series of 3x300s exposures in each band. We do not detect an uncataloged source within the XRT error region in either band. This result is consistent with other optcal upper limits (Lipunov et al., GCN 37137; Du et al., GCN 37140).
The following 5-sigma upper limits are calculated using the PanSTARRS catalog as reference:
r > 22.6
i > 20.5
These magnitudes are not corrected for galactic extinction.