TITLE: GCN CIRCULAR NUMBER: 38089 SUBJECT: GRB 241104A: NOT optical non-detection DATE: 24/11/05 21:36:21 GMT FROM: Daniele B. Malesani at IMAPP / Radboud University d.malesani@astro.ru.nl

D. B. Malesani (DAWN/NBI and Radboud Univ.), A. Martin-Carrillo (UCD), D. Xu (NAOC), M. Turkki (NOT) report on behalf of a larger collaboration:

We observed the candidate optical counterpart (Qiu et al., GCN 38086) of GRB 241104A (Fermi GBM team, GCN 38075; Schanne et al., GCN 38078; Zhang et al., GCN 38082), using the Nordic Optical Telescope (NOT) equipped with the ALFOSC imager. Observations were carried out in the SDSS r, i, and z filters.

No object is detected at the location of the candidate counterpart, down to the following 3-sigma limiting magnitudes:

r > 24.0 AB 2024 Nov 5.859 UT (1.088 days after the trigger) i > 23.7 AB 2024 Nov 5.871 UT (1.100 days after the trigger) z > 22.2 AB 2024 Nov 5.847 UT (1.077 days after the trigger)

Calibration was performed against nearby Pan-STARRS sources.

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