GRB 210822A: GROND observations
Abstract
We observed the field of GRB 210822A (Swift trigger #1069788; Page et al., GCN 30677) with GROND mounted at the 2.2m MPG telescope at La Silla Observatory (Chile). Observations started at 02:54 UT on August 23, about 17.6 hr after the GRB trigger. They were performed at an average seeing of 2.2 arcsec and at an average airmass of 1.2. Based on combined images with 10 min total exposure, at a mid-time of 03:02 UT on 2021-08-23 for the afterglow (Page et al., GCN 30677; Zheng & Filippenko, GCN 30679; Butler et al., GCN 30680; Fu et al., GCN 30684; Zhu et al., GCN 30692; Romanov & Lane, GCN 30701) we derive the following AB magnitudes: g' = 20.37 +/- 0.09, r' = 20.10 +/- 0.05, i' = 19.92 +/- 0.05. Given magnitudes are calibrated against Pan-STARRS and are not corrected for the expected Galactic foreground extinction corresponding to a reddening of E(B-V) = 0.14 mag in the direction of the burst (Schlegel et al. 1998). We thank Angela Hempel for excellent support and for performing the observations.
- Publication:
-
GRB Coordinates Network
- Pub Date:
- August 2021
- Bibcode:
- 2021GCN.30703....1N