GCN Circular 33662
Subject
GRB 230420A: LCOGT Optical Upper Limit
Date
2023-04-20T23:21:17Z (a year ago)
From
Robert Strausbaugh at University of Minnesota <rstrausb@umn.edu>
R. Strausbaugh (University of Minnesota), A. Cucchiara (NASA) report on
behalf of a larger collaboration:
We observed the GRB 230420A (Klingler et al., GCN 33658) field with the
LCOGT 1-meter Sinistro instrument at the Teide Observatory, Tenerife site,
on April 20, from 20:28 to 20:55 UT (corresponding to 11.15 to 11.72 hours
from 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 a
source within the Swift-XRT enhanced error region (Osborne et al., GCN
33661) in either band.
The following upper limits are calculated using the PanSTARRS catalog as
reference:
r > 22.3
i > 21.8
These magnitudes are not corrected for galactic extinction.