GCN Circular 37692
Subject
GRB 241002B: ULL-ASTRO-MASTER LCOGT 0.4m + QHY600 detection of the GOTO optical counterpart candidate AT 2024xbg / GOTO24gpc
Date
2024-10-03T12:45:46Z (4 months ago)
From
Ismael Perez-Fournon at Instituto de Astrofisica de Canarias <ipf@iac.es>
Via
Web form
M. Torreiro Martínez, B. Armas-Chinea, F. Dobrindt, P. Escudero-Coca, G. Fernández-Rodríguez, Á. García Lozano, A. Huertas Ferrer, C. Méndez-Lapido, I. Ortega-Casas, Guillermo Villa (ULL), S.R. Berlanas, and I. Pérez-Fournon (IAC and ULL)
We report on optical follow-up observations of the GOTO optical counterpart candidate AT 2024xbg / GOTO24gpc (Kumar et al. GCN 37676) of the FERMI long GRB GRB 241002B (Fermi GBM Team, GCN 37368, trigger 749542463.76265 / 241002260, trigger time 2024-10-02T06:14:18 UT).
We observed the field of AT 2024xbg with one of the Las Cumbres Observatory Global telescope network (LCOGT) 40-cm telescopes located at the LCOGT node at Siding Spring Observatory (Australia). Observations were performed using one of the LCOGT Planewave Delta Rho 350 telescopes equipped with QHY600 CMOS cameras in the SDSS g´and r´filters, with 500 sec exposures in each of the filters.
We detect a faint source at the position of AT 2024xbg (GOTO24gpc) with magnitudes g'= 20.18 +/- 0.3 at 2014-10-02T12:26:41 UT and r´ = 19.90 +/- 0.25 at 2014-10-02T12:35:09 UT, calibrated using stars from the catalog of Gaia DR3 synthetic photometry generated from the Gaia BP/RP mean spectra (Gaia collaboration 2022) and without corrections for Milky Way extinction.
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 (programme IAC2024B-010), as part of a course on Astrophysical Techniques of the Master in Astrophysics of the Universidad de La Laguna, Tenerife, Spain.