GCN Circular 38551
Subject
GRB241212A: OHP/T193 optical observations
Event
Date
2024-12-13T10:32:53Z (a year ago)
Edited On
2024-12-13T13:30:49Z (a year ago)
From
Christophe Adami at LAM <christophe.adami@lam.fr>
Edited By
Judith Racusin at NASA/GSFC <judith.racusin@nasa.gov> on behalf of Christophe Adami at LAM <christophe.adami@lam.fr>
Via
Web form
C. Adami (LAM/Pytheas/AMU), J. Schmitt (OHP/Pytheas/AMU), S. Basa (LAM/OHP/Pytheas/AMU) report
on behalf of a larger collaboration:
We observed the field of GRB241212A (Fermi GBM team, GCN 38540; Zhang Li et al., GCN 38541; Joshi
et al., GCN 38544; Qiu et al., GCN 38545; Zhe Kang et al., GCN 38546) using the T193cm telescope
at Observatoire de Haute-Provence (France) equipped with the MISTRAL spectro-imager. Six exposures
were obtained in the Y-band (6x300s) with the MISTRAL red mode during technical time from 2024 12
December 18:43 UT to 2024 12 December 19:15 UT (~+9.5h after detection). The moon was at an
illumination of ~92% and at a distance of 13deg from target.
We do not detect the SVOM VT GRB counterpart provided by Qiu et al. (GCN 38545). The combined
frame has a detection upper limit of Y~19.25+/-0.6 (5sigma limit). The photometric calibration
was performed using objects from the PanSTARRS catalog. The magnitude is not corrected for
Galactic extinction.
We acknowledge the excellent support from Observatoire de Haute-Provence, in particular Jean Pierre
Troncin, Francois Huppert, and Jean-Claude Brunel and the SOPHIE observers Guillaume Hebrard and Florian Destriez.