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.