GCN Circular 37877

Malte Busmann (LMU), Daniel Gruen (LMU), Brendan O’Connor (Carnegie Mellon U.), Antonella Palmese (Carnegie Mellon U.) and Michael Schmidt (LMU) report:

We observed the counterpart of EP241021a (Hu et al., GCN 37834
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; Fu et al., GCN 37840
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) with the 3KK imager at the Fraunhofer Telescope Wendelstein in rzJ simultaneously for 11 x 180 s starting on 2024-10-24T02:12:17 UT (2.88 days after the trigger) and 40 x 180 s starting on 2024-10-24T23:42:00 (3.77 days after the trigger).

The counterpart is marginally detected in the first observations and clearly visible in the second round of observations in all bands. At 3.77 days after the trigger, the counterpart is at r=22.49+/-0.05 mag (not corrected for Galactic extinction) which is consistent with previous reports from Fu et al., GCN 37840
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; Fu et al., GCN 37842
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; Li et al., GCN 37844
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; Ror et al., GCN 37845
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; Li et al., GCN 37846
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; Zheng et al., GCN 37849
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; Moskvitin and Spiridonova, GCN 37850
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; Pugliese et al., GCN 37852
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.

We thank the staff of the Wendelstein Observatory for obtaining these observations.