GRB 200425A: LCO Optical Upper Limits
Abstract
We observed Swift GRB 200425A (Bernardini et al., GCN 27638) with the LCO 1-m Sinistro instrument at the Siding Spring Observatory, Australia site, on April 25, from 08:26 to 09:07 UT (corresponding to 8.17 to 8.85 hours from the GRB trigger time) with the Bessel I and R filters. We performed a series of 5x240s exposures in R and I. We do not detect any fading sources in the individual frames (or in stacked images) in the Enhanced Swift-XRT position region (Beardmore et al., GCN 27639). Using the USNO-B.1 catalog as reference, we obtain the following 3-sigma upper limits: R > 22.45 I > 21.96 These magnitudes are not corrected for galactic extinction. R.S. is funded by NSF AST grant #1831682
- Publication:
-
GRB Coordinates Network
- Pub Date:
- April 2020
- Bibcode:
- 2020GCN.27646....1S