GCN Circular 37957
Subject
GRB 241030A: COLIBRÍ Detection of the Bright Optical Counterpart
Date
2024-10-30T08:19:57Z (a month ago)
From
Alan Watson at UNAM <alan@astro.unam.mx>
Via
legacy email
Alan M. Watson (UNAM), S. Antier (OCA), Stéphane Basa (UAR Pytheas),
William H. Lee (UNAM), Dahlia Akl (AUS), Jean-Luc Atteia (IRAP), Nathaniel
R. Butler (ASU), Damien Dornic (CPPM), J.-G. Ducoin (CPPM), Francis Fortin
(IRAP), Simona Lombardo (LAM), Francesco Magnani (CPPM), and Margarita
Pereyra (UNAM) report:
We imaged the field of GRB 241030A detected by Fermi/GBM, Swift/BAT, and
Swift/XRT (Fermi GBM Team, GCN Circ. 37955; Klingler et al., GCN Circ.
37956) during the commissioning of the COLIBRÍ (SVOM/F-GFT) telescope at
the Observatorio Astronómico Nacional on the Sierra de San Pedro Mártir in
Mexico.
We observed with the engineering test camera in a red filter that
approximates SDSS r. We observed from 2024-10-30 07:33 to 07:43 UTC (1.8
hours after the trigger) and obtained 480 seconds of exposure. The data
were reduced using custom software and then analyzed and calibrated against
the PS1 catalog using the STDWeb service (Karpov et al., 2022).
We detect the optical counterpart at RA =343.13994 and Dec = 80.44994
(J2000) with an AB magnitude of:
r = 16.68 +/- 0.01
Further observations are planned.
We warmly thank the COLIBRÍ engineering team and the staff of the
Observatorio Astronómico Nacional on the Sierra de San Pedro Mártir.