GRB 200716C: Optical observations from HCT
Abstract
We observed the field of GRB 200716C (Fermi GBM, GCN #28123; Ukwatta et al., GCN #28124) with the Himalaya Faint Object Spectrograph and Camera (HFOSC) mounted on the 2-m Himalayan Chandra Telescope (IAO, Hanle, India). Multiple frames (each 300 sec) of the GRB field in Bessell R and I bands were obtained under moderate sky conditions. Preliminary PSF photometry on the stacked images was performed and calibrated against USNO-B1 catalogue. The estimated magnitudes are listed below: DATE | UT (mean) | Exposure | Filter | Mag 2020-07-17 17:06:34 300x3 R 17.55 +/- 0.18 2020-07-17 17:23:33 300X3 I 17.19 +/- 0.15 Here, we caution that there is an extended object near the GRB location (possibly the host galaxy, D'Avanzo et al. GCN #28132). However, the extended source is fainter (~19.23 and ~18.67 mag in R and I bands, respectively, USNO-B1). Therefore, the estimated magnitudes likely belong to the OT candidate (Lipunov et al., GCN #28125; Hu et al., GCN #28126), affected by the host contamination. We thank the staff at IAO and CREST for helping with the observations.
- Publication:
-
GRB Coordinates Network
- Pub Date:
- July 2020
- Bibcode:
- 2020GCN.28138....1K