GCN Circular 37361
Subject
GRB 240825A: SOAR observations
Date
2024-08-31T13:26:09Z (4 months ago)
From
James Freeburn at Swinburne University of Technology <jamesfreeburn54@gmail.com>
Via
Web form
J. Freeburn (Swinburne/OzGrav) and I. Andreoni (UNC/UMD/NASA)
We observed the field of GRB 240825A (The Fermi GBM team,
GCN 37273; Gupta et al., GCN 37274; Lalla et al., GCN 37288;
Evans et al., 37290; Gropp et al., GCN 37294; Joshi et al.,
GCN 37298; Sharma et al., GCN 37301; Frederiks et al., GCN 37302;
Wang and Xiong, GCN 37315; Moss et al., GCN 37355) with the
Goodman High Throughput Spectrograph mounted on the SOAR telescope
in imaging mode. We took one 300s exposure each in filters
g,r and i between 2024-08-31T04:45:51 and 2024-08-31T05:00:23 UTC.
We place upper limits on the optical counterpart to GRB 240825A
(Gupta et al., GCN 37274; Jiang et al., GCN 37275; Dutton et al.,
GCN 37276; Odeh et al., GCN 37277; Zhang et al., GCN 37278;
Li et al., GCN 37280; Izzo et al., GCN 37287; Lipunov et al.,
GCN 37289; Leonini et al., GCN 37291; Wu et al., GCN 37292;
Martin-Carrillo et al., GCN 37293; Brivio et al., GCN 37295;
Kuin et al., GCN 37296; Odeh et al., GCN 37299; Le Floc'h et al.,
GCN 37300; Guiffreda et al., GCN 37303; Zheng et al., GCN 37304;
Wang et al., GCN 37306; Maksut et al., GCN 37307; Melandri et al.,
GCN 37310; Romanov, GCN 37335; Moskvitin et al., GCN 37336;
Qiu et al., GCN 37338). Zeropoints for each filter were measured
using the Pan-STARRS1 catalogue. Our AB magnitude 5-sigma upper
limits are as follows:
g > 23.2
r > 23.1
i > 22.8