GCN Circular 37958
Subject
GRB 241030A: ULL-ASTRO-MASTER detection of a bright optical counterpart with the LCOGT 40-cm telescope at McDonald Observatory
Date
2024-10-30T09:02:17Z (2 days ago)
From
Ismael Perez-Fournon at Instituto de Astrofisica de Canarias <ipf@iac.es>
Via
Web form
G. Fernández-Rodríguez, B. Armas-Chinea, F. Dobrindt, P. Escudero-Coca, Á. García Lozano, A. Huertas Ferrer, C. Méndez-Lapido, I. Ortega-Casas, M. Torreiro Martínez, G. Villa (all ULL), S.R. Berlanas (IAC and ULL), and I. Pérez-Fournon (IAC and ULL)
We report on optical follow-up observations of the likely long GRB 241030A detected by the Fermi Gamma-ray Burst Monitor (GBM) at 05:48:03 UT on 30 Oct 2024 (Fermi GBM team, GCN 37955) and by Swift BAT, XRT, and UVOT (Klinger et al., GCN 37956).
We observed the field of GRB 241030A with the Las Cumbres Observatory Global telescope network (LCOGT) Planewave Delta Rho 350 telescope and QHY600 CMOS camera located at the LCOGT node at McDonald Observatory (Texas, USA) in the SDSS g' and r' filters (600 sec exposures in both filters).
We detect a bright optical counterpart at a position consistent with the Swift UVOT coordinates (Klinger et al., GCN 37956) with magnitudes g' = 15.92 +/- 0.02 (starting at 06:25:11 UT
on 30 Oct 2024, about 37 minutes after the Fermi trigger) and r'= 15.87 +/- 0.02 (starting at 06:35:19 UT on 30 Oct 2024, about 47 minutes after the Fermi trigger), calibrated against the PanSTARRS DR2 catalog and without corrections for Galactic extinction.
The bright optical counterpart has also been detected by COLIBRÍ (Watson et al., GCN 37957).
We encourage multiwavelength follow up.
These results are based on observations made with the Las Cumbres Observatory’s education network telescopes that were upgraded through generous support from the Gordon and Betty Moore Foundation, as part of a course on Astrophysical Techniques of the Master in Astrophysics of the Universidad de La Laguna, Tenerife, Spain (LCOGT observing programme IAC2024B-010, ULL-ASTRO-MASTER).