GCN Circular 37911

J. Freeburn (Swinburne/OzGrav), I. Andreoni (UNC), J. Quirola-Vasquez (Radboud Univ.), D. B. Malesani (DAWN/NBI and Radboud Univ.), F. E. Bauer (PUC), P. G. Jonker (Radboud Univ)

We observed the field of EP241021a (Hu et al., GCN 37834
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) with the Goodman High Throughput Spectrograph mounted on the SOAR telescope in imaging mode (Prop. ID: SOAR2024B-021, SOAR2024B-016). We took four 300s exposures i-band between 2024-10-27T04:56:18 and 2024-10-27T05:16:54 UTC. 

We detect the optical counterpart associated with EP241021a (Fu et al., GCN 37840
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; Gompertz et al., GCN 37835
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; Lipunov et al., GCN 37839
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; Fu et al., GCN 37842
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; Yang et al., GCN 37843
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; Li et al., GCN 37844
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; Li et al., GCN 37846
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; Zheng et al., GCN 37849
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; Moskvitin et al., GCN 37850
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; Pugliese et al., GCN 37852
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; Pérez-Fournon et al., GCN 37858
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; Bochenek et al., GCN 37869
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; Kumar et al., GCN 37875
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; Jin et al., GCN 37892
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).  With photometric calibration using the Pan-STARRS1 catalogue, we measure an r=2.5” aperture magnitude of:

i = 22.355 +/- 0.066 AB mag