GRB 210218A: GWAC-F60A optical upper limit
Abstract
We began to observe GRB 210218A (Sbarufatti al., GCN 29529) with Xinglong GWAC-F60A telescope, China, at 11:37:45 (UT), 18th. Feb. 2021, about 146 sec after the burst, under bad seeing condition. A series of R, I images were obtained. Preliminary analysis shows that no any new optical source was found in single images within the Swift errorbox (Sbarufatti al., GCN 29529), down to the 3 sigma upper limit of 15.0 mag in R band. The upper limit is calibrated to the USNO B1.0 catalog. This result is consistent with the previous report (Zhu et al., GCN 29530).
- Publication:
-
GRB Coordinates Network
- Pub Date:
- February 2021
- Bibcode:
- 2021GCN.29531....1X