TITLE: GCN CIRCULAR NUMBER: 38617 SUBJECT: GRB 241218a: Liverpool Telescope optical follow-up DATE: 24/12/18 13:28:21 GMT FROM: A. Bochenek at Liverpool John Moores University a.m.bochenek@2023.ljmu.ac.uk

A. Bochenek and D. A. Perley (LJMU) report:

We observed the Gamma-Ray Burst GRB 241218a (Williams et al., GCN 38601) using the IO:O optical camera on the 2m robotic Liverpool Telescope. We obtained 3x200s exposures with the SDSS r’ and SDSS i’ filters starting at 2024-12-18 03:33:56 UT, approximately 3.4 hours after the trigger.

We do not detect any new sources at the Swift/XRT enhanced position (Beardmore et al., GCN 38604). The 3-sigma limiting magnitudes on the stacked images are r > 20.9 mag and i > 21.0 mag, calculated using the nearby PanSTARRS secondary standards as reference. The photometry was not corrected for extinction.

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