GCN Circular 37993
Subject
GRB 241030A: detection of the bright optical counterpart in ATLAS forced photometry
Date
2024-10-30T23:47:05Z (8 months ago)
From
Ismael Perez-Fournon at Instituto de Astrofisica de Canarias <ipf@iac.es>
Via
Web form
C. Méndez-Lapido, B. Armas-Chinea, F. Dobrindt, P. Escudero-Coca, G. Fernández-Rodríguez, Á. García Lozano, A. Huertas Ferrer, I. Ortega-Casas, M. Torreiro Martínez, G. Villa (all ULL), S.R. Berlanas (IAC and ULL), and I. Pérez-Fournon (IAC and ULL)
We have used the ATLAS forced photometry server (Shingles et al. 2021, Transient Name Server AstroNote 2021-7) to search for detections of the optical/UV counterpart (Klingler et al, GCN 37956;
Watson et al., GCN 37957; Fernández-Rodríguez et al., GCN 37958; Zheng et al., GCN 37959;
An et al.; GCN 37960; Higuchi et al., GCN 37963; SVOM/VT commissioning team and SVOM JSW, GCN 37965;
Lin et al., GCN 37966; SVOM/C-GFT team and SVOM JSWG, GCN 37970; Breeveld and Klingler, GCN 37974; and Odeh et al., GCN 37976) of GRB 241030A, detected by Fermi GMB (Fermi GBM team, GCN 37955) and LAT (Pillera et al., GCN 37979), Swift BAT, XRT, and UVOT (Klingler et al., GCN 37956; Beardmore et al., GCN 37962; Breeveld and Klingler, GCN 37974; and Ambrosi et al., GCN 37988),
Konus-Wind (Ridnaia et al., GCN 37982), and SVOM/GRM (SVOM/GRM team and SVOM JSWG, GCN 37972).
Using the ATLAS (Tonry et al. 2018, PASP 130 064505; Smith et al. 2020, PASP 132 085002) forced photometry server (Shingles et al. 2021, Transient Name Server AstroNote 2021-7) at the position of the Swift UVOT bright optical counterpart (Klingler et al., GCN 37956) reveals three strong detections in the ATLAS cyan filter with magnitudes 17.178 +/- 0.032, 17.258 +/- 0.031, and 17.332 +/- 0.035, at MJDs 60613.335407, 60613.338646, and 60613.344651, respectively, with a clear flux fading in these three epochs.
This work has made use of data from the Asteroid Terrestrial-impact Last Alert System (ATLAS) project. The Asteroid Terrestrial-impact Last Alert System (ATLAS) project is primarily funded to search for near earth asteroids through NASA grants NN12AR55G, 80NSSC18K0284, and 80NSSC18K1575; byproducts of the NEO search include images and catalogs from the survey area. This work was partially funded by Kepler/K2 grant J1944/80NSSC19K0112 and HST GO-15889, and STFC grants ST/T000198/1 and ST/S006109/1. The ATLAS science products have been made possible through the contributions of the University of Hawaii Institute for Astronomy, the Queen’s University Belfast, the Space Telescope Science Institute, the South African Astronomical Observatory, and The Millennium Institute of Astrophysics (MAS), Chile.