GRB210222B: LCO Optical Afterglow Detection
Abstract
We observed Swift GRB 210222B (Gropp et al., GCN 29545) with the LCO 1-m Sinistro instrument at the Sutherland, South Africa site, on February 22, from 22:53 to 23:06 UT (corresponding to 0.27 to 0.43 hours from the GRB trigger time) with the Bessel R and I filters. We performed a series of 3x120s exposures in R and I. We clearly detect an optical source in R and I band in stacked images at a location consistent with the initial UVOT detection (Gropp at al., GCN 29444); this source is not present in either USNO or 2MASS catalogs. Using the USNO-B.1 catalog as reference, we calculate the following magnitudes: R = 16.95 +/- 0.01 I = 16.32 +/- 0.01 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:
- February 2021
- Bibcode:
- 2021GCN.29547....1S