GRB 220403B: Nanshan/NEXT optical afterglow power-law decay
Abstract
We observed the field of GRB 220403B detected by Swift (Klingler et al., GCN 31820) using the NEXT-0.6m telescope located at Nanshan, Xinjiang, China. Observations started at 21:10:31 UT on 2022-04-03 (i.e., 27.8 min after the BAT trigger), and a series of 300 s frames were obtained in the Sloan r-filters. The optical afterglow (Klingler et al., GCN 31820) is clearly detected in each of our images. The preliminary photometric analysis shows that the afterglow decays from r ~ 19.04 to r ~ 19.64 in 47 minutes, with a decay index of \alpha ~ 0.6 (F_t ~ t^-\alpha), calibrated the nearby PS1 stars. Our measurement is consistent with that in other reports (Jelinek et al., GCN 31821; Nicuesa Guelbenzu et al., GCN 31822).
- Publication:
-
GRB Coordinates Network
- Pub Date:
- April 2022
- Bibcode:
- 2022GCN.31823....1Z