GRB 230228A: Nanshan/NEXT optical upper limit
Abstract
We observed the field of GRB 230228A detected by Swift (Dichiara et al., GCN 33378) using the NEXT-0.6m telescope located at Nanshan, Xinjiang, China. We obtained 12x200 s frames in the Sloan r-band and 12x200 s frames in the Sloan z-band, starting at 14:37:32 UT on 2023-02-28 (i.e., 8.77 hr after the BAT trigger). No optical source is detected in our stacked images at the enhanced XRT position (Evans, GCN 33379), and preliminary photometric results are as follows: T_mid-T0 (hr) Filter Upper limit(3-sigma) 9.86 r >20.6 9.14 z >19.5 calibrated with the nearby PanSTARRS field and not corrected for Galactic extinction.
- Publication:
-
GRB Coordinates Network
- Pub Date:
- February 2023
- Bibcode:
- 2023GCN.33381....1L