GCN Circular 27637
Subject
GRB 200424A: LCO Optical Upper Limit
Date
2020-04-24T20:24:56Z (4 years ago)
From
Robert Strausbaugh at U. of the Virgin Islands <robert.strausbaugh@uvi.edu>
R. Strausbaugh (U. of the Virgin Islands), A. Cucchiara (U. of the Virgin Islands/College of Marin) report on behalf of a larger collaboration:
We observed INTEGRAL GRB 200424A (Mereghetti et al., GCN 27634) with the LCO 1-m Sinistro instrument at the Siding Spring Observatory, Australia site, on April 24, from 18:48 to 19:23 UT (corresponding to 6.68 to 7.27 hours from the GRB trigger time) with the Bessel I and R filters.
We performed a series of 5x240s exposures in R and 4x240s in I. We do not detect any fading sources in the individual frames (or in stacked images). Using the USNO-B.1 catalog as reference, we obtain the following 3-sigma upper limits:
R > 24.83
I > 22.93
These magnitudes are not corrected for galactic extinction.
R.S. is funded by NSF AST grant #1831682