GRB 231205B: r'-band observations from MISTRAL at Observatoire de Haute-Provence
Abstract
We observed the field of GRB231205B (GCN 35269; Evans et al., GCN 35270, Odeh et al.) using the MISTRAL spectro-imager mounted at the T193cm telescope at Observatoire de Haute-Provence (France) under a poor seeing of ~3arcsec. We began our observations on 2023 05 December 20:56:18 UT (~5.2h after the trigger time) with a series of r'-band (300s + 6x720s) images. Last image was taken at 22:26:25 UT. Consistently with Evans et al. and Odeh et al., we do not detect any credible optical counterpart to GRB231205B within the GCN 35269 Swift XRT error box. Using the r-band PanStarr public image, the faintest detected object in our r-band image with a measured PanStarr magnitude is at rmeanKronmag=20.65. Using the i-band PanStarr public image, the faintest detected object in our r-band image with a measured PanStarr magnitude is at imeanKronmag=21.60. We acknowledge the excellent support from Observatoire de Haute-Provence, in particular Jean Balcaen..
- Publication:
-
GRB Coordinates Network
- Pub Date:
- December 2023
- Bibcode:
- 2023GCN.35286....1A