GRB 201221D: Nanshan/NEXT early optical upper limit
Abstract
We observed the field of GRB 201221D (Page et al., GCN 29112) using the NEXT-0.6m optical telescope located at Nanshan, Xinjiang, China. Observations automatically started at 23:07:39 UT on 2020-12-21, i.e., 65 s after the BAT trigger. We obtained 3x40s, 4x60s and 12x90s frames in the Sloan r-filter. No optical source is detected in our stacked image at the XRT enhanced position (Evans et al., GCN 29113), down to a upper limit of r~21.3, calibrated with the nearby PanSTARRS field.
- Publication:
-
GRB Coordinates Network
- Pub Date:
- December 2020
- Bibcode:
- 2020GCN.29118....1X