GRB 210222B: NEXT early optical afterglow observations
Abstract
We observed the field of GRB 210222B (Gropp et al., GCN 29545) using the NEXT-0.6m optical telescope located at Nanshan, Xinjiang, China. Observations automatically started at 22:39:01 UT on 2021-02-22, i.e., 95 s after the BAT trigger. We obtained a series of 40 s and 60 s frames during the local morning twilight in the Sloan r-filter. The previously reported optical afterglow (Gropp et al., GCN 29545; Hu et al., GCN 29546; Strausbaugh et al., GCN 29547; Mong et al., GCN 29548, 29550; Perley et al., GCN 29549) is detected in the stacked images of the first three exposures, with r = 14.5 +/- 0.3 mag, calibrated with nearby PS1 stars.
- Publication:
-
GRB Coordinates Network
- Pub Date:
- February 2021
- Bibcode:
- 2021GCN.29551....1Z