TITLE: GCN CIRCULAR NUMBER: 37350 SUBJECT: GRB 240828B: GMG Optical Upper Limit DATE: 24/08/30 09:03:28 GMT FROM: wangbaiting@ynao.ac.cn

B.-T. Wang, R.-Z. Li, F.-F. Song, J. Mao, K.-X. Lu and J.-M. Bai (YNAO, CAS) report:

We observed the field of GRB 240828B (SVOM/ECLAIRs, T0 at 2024-08-28T13:12:43, GCN 37318) using the GMG-2.4m telescope at the Lijiang Observatory. The observation began at 2024-08-28T19:21:41.934, about 6.13 hours after the trigger.

No new reliable optical counterpart was detected within the 2.6-arcsec Swift/XRT error circle (GCN 37334), down to a 5-sigma limiting magnitude of sdss-r ～ 21.7 mag, derived from calibration against the Pan-STARRS DR1 field stars.

We acknowledge the staff at the Lijiang Observatory for conducting the observation.

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