TITLE: GCN CIRCULAR NUMBER: 37544 SUBJECT: EP240918a: GMG Optical Upper Limit DATE: 24/09/18 15:44:35 GMT FROM: wangbaiting@ynao.ac.cn
B.-T. Wang, R.-Z. Li, F.-F. Song, J. Mao, Y.-F. Fan and J.-M. Bai (YNAO, CAS) report:
We observed the field of EP240918a (Zhang et al., GCN 37541, T0 at 2024-09-18T11:24:37) using the GMG-2.4m telescope at the Lijiang Observatory. The observation began at 2024-09-18T14:02:51, about 2.64 hours after the trigger.
No new credible optical counterpart of EP240918a was detected within the EP-FXT error circle (GCN 37541).
The preliminary analysis results are shown as follows: +----------------+------------+----------+----------------+ | Tmid-T0 [hr] | Exp. [s] | Filter | 5-sigma U.L. | +================+============+==========+================+ | 2.72 | 600 | R | 20.5 | +----------------+------------+----------+----------------+ The given magnitudes are derived based on calibrating against Pan-STARRS1 field stars.
We acknowledge the staff at the Lijiang Observatory for conducting the observation.
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