GCN Circular 44589

Subject

GRB 260510C: Infrared J and Hs detections with MDM/MIRAGE

Event

GRB 260510C

Date

2026-05-12T20:44:36Z (3 days ago)

From

Geoffrey Mo at Caltech / Carnegie Observatories <gmo@mit.edu>

Via

Web form

Geoffrey Mo (Carnegie/Caltech), K. De, V. Karambelkar, S. Ibrahim, D. Schiminovich (Columbia University) report:

We observed the field of GRB 260510C (Fermi GBM Team, GCN 44520

; Gotz et al., GCN ; Iwakiri et al., GCN ; Fu et al., GCN ; Arya et al., GCN ; Palafox et al., GCN ) in the near-infrared J and Hs bands with the MDM InfraRed Astronomy inGaas Explorer (MIRAGE) instrument on the MDM 1.3 m telescope.

Observations began at 2026-05-11T03:31:14 (+10.3 hours after the GRB trigger) in the J band and 2026-05-11T04:04:31 (+10.8 hours) in the Hs band, lasting 1620 s in each filter.

The optical counterpart (Li et al, GCN 44527

; Angulo et al., GCN ; Li et al., GCN ; Lee et al., GCN ) is detected in both filters, with the following AB magnitudes: J = 19.64 ± 0.16, Hs = 19.42 ± 0.24.

MIRAGE is a new YJHs-band near-infrared imager for the MDM 1.3m telescope. We thank the MDM Observatory staff for supporting the observations.