TITLE:   GCN CIRCULAR
NUMBER:  37361
SUBJECT: GRB 240825A: SOAR observations
DATE:    24/08/31 13:26:09 GMT
FROM:    James Freeburn at Swinburne University of Technology <jamesfreeburn54@gmail.com>

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