GRB 201221D: near-infrared observation with LBT
Abstract
We observed the location of the optical afterglow (Malesani et al., GCN 29117) of the short GRB 201221D (Page et al., GCN 29112) simultaneously in the J and Ks bands with the LUCI near-infrared imager and spectrograph mounted on the Large Binocular Telescope (LBT, Mt Graham, AZ, USA). Observations were obtained on 2020-12-24 at the UT midtime 11:40:00, i.e. ~2.5 days after the burst trigger, for a total of 20 min of exposure in each band. Inspection of the combined J and K-band images reveals a faint, extended source in both filters, for which we preliminary measure J=21.7+-0.3 (Vega system), calibrated against 2MASS field stars. We acknowledge the excellent support from the LBTO and LBT-INAF staff, particularly A. Cardwell, F. Cusano, and D. Paris, in obtaining these observations.
- Publication:
-
GRB Coordinates Network
- Pub Date:
- January 2021
- Bibcode:
- 2021GCN.29311....1R