GRB 210504A: LCO Optical Afterglow Detection
Abstract
We observed Swift GRB 210504A (Beardmore, et al., GCN 29929) with the LCO 1-m Sinistro instrument at the South African Astronomical Observatory site, on May 5, from 18:49 to 18:56 UT (corresponding to 4.92 to 5.03 hours from the GRB trigger time) with the Bessel R filter. We performed a series of 3x180s exposures in R. We detect an uncatalogued optical source in the coadded images consistent with the UVOT position (Breeveld, et al., GCN 29933). Using the USNO-B.1 catalog as reference, we calculate the following magnitude: R=20.29+/-0.18 These magnitudes are not corrected for galactic extinction. R.S. is funded by NSF AST grant #1831682
- Publication:
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GRB Coordinates Network
- Pub Date:
- May 2021
- Bibcode:
- 2021GCN.30027....1S