TITLE: GCN CIRCULAR NUMBER: 38199 SUBJECT: GRB 241112B: GMG Optical Upper Limit DATE: 24/11/13 14:02:50 GMT FROM: wangbaiting@ynao.ac.cn
B.-T. Wang, R.-Z. Li, F.-F. Song, J. Mao, H.-C. Feng and J.-M. Bai (YNAO, CAS) report:
We observed the field of GRB 241112B (SVOM/ECLAIRs team, GCN 38173; Evans, GCN 38174; Kumar et. al, GCN 38175; Du et. al, GCN 38176; SVOM/VT team, GCN 38179; SVOM/GRM team, GCN 38180; Turpin et. al, GCN 38181; Osborne et. al, GCN 38182; Du et. al, GCN 38183; Pankov et.al, GCN 38184) with the GMG-2.4m telescope at the Lijiang Observatory. The observation began at 2024-11-12T16:42:20, about 5.75 hours after the trigger.
No new uncataloged optical counterpart was detected within the SVOM/VT error circle (GCN 38179). It should be noted that due to the proximity and brightness of the Moon on the observational night, the optical signal from the GRB 241112B may have been affectd by the moonlight.
The preliminary photometry is as follows: ----------------------------------------------------------------------------- UT EXP(s) filter mag ----------------------------------------------------------------------------- 2024-11-12T16:42:20 600 sdss-r >21.4 ----------------------------------------------------------------------------- The magnitudes were calibrated using nearby stars of Pan-STARRS DR1 field and without corrections for Galactic extinction.
We acknowledge the staff at the Lijiang Observatory for conducting the observation.
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