GCN Circular 34247
Subject
GRB 230723B: non-detections from Observatoire de Haute-Provence
Date
2023-07-24T09:43:47Z (2 years ago)
From
Emeric Le Floc'h at CEA-Saclay <emeric.lefloch@cea.fr>
C. Adami (LAM), J.-C. Cuillandre (CEA Paris-Saclay), M. Ollivier, H. Dole (IAS, Université Paris-Saclay), T. Adami (ENS Paris-Saclay), A. de Ugarte Postigo (OCA/CNRS), E. Le Floc’h, D. Götz (CEA Paris-Saclay), A.Saccardi, S.Vergani (GEPI, Obs. de Paris), S. Basa (LAM), report on behalf of a larger collaboration :
We observed the field of GRB 230723B (Page et al. GCN 34234) using the T193cm and T120cm telescopes at Observatoire de Haute-Provence (France). We obtained 26 exposures in the r’-band (4x30sec + 22x150sec) with MISTRAL on the T193cm for a total exposure time of 57min, starting at 20:54 UT with a mean epoch at ~0.42days after trigger. At the same time we also obtained 10 exposures of 6min in the I-band at T120cm (total time of 1h). In the r’-band and I-band combined frames, we do not detect any new source within the XRT error box (Page & Evans, GCN 34238). Our photometric calibration was performed using nearby stars from the PanSTARRS catalog, leading to the following lower limits :
r’ > 21 mag (AB, 3 sigma)
I > 19.25 mag (AB, 3 sigma)
These non-detections are consistent with the CAHA deeper observations in the i-band reported earlier by Agui Fernandez et al. (GCN 34241).
We acknowledge the excellent support from Observatoire de Haute-Provence, in particular Yoann Degot-Longhi, and we also thank Alice Morel.