TITLE:   GCN CIRCULAR
NUMBER:  45330
SUBJECT: GRB 260808B: Liverpool Telescope optical observations
DATE:    26/08/09 12:05:07 GMT
FROM:    A. Bochenek at Liverpool John Moores University <a.m.bochenek@2023.ljmu.ac.uk>

A. Bochenek, D. A. Perley (LJMU), report:

We observed the field of GRB 260808B (Bouchet et al., GCN 45316) using the IO:O optical camera on the 2m robotic Liverpool Telescope. We obtained 8x120s exposures in SDSS griz filters, starting at 2026-08-09 00:32:11 UT, approximately 10.17 hours after SVOM/ECLAIRS trigger.

We detect a source in the stacked images at the counterpart position reported by Turpin et al. (GCN 45318), Li et al. (GCN 45320), also observed by Wang et al. (GCN 45322), Adami et al. (GCN 45323), Saccardi et al. (GCN 45328), and Schneider et al. (GCN 45329), with preliminary photometry given below:

MJD (mid)         T_mid-T_0        Filter       Mag. (AB)
61261.02909        10.35 h           i         22.50 ± 0.23
61261.04320        10.88 h           z         21.96 ± 0.28
61261.05760        11.03 h           g         22.95 ± 0.25
61261.07154        11.37 h           r         22.74 ± 0.19

The photometry is in the AB magnitude system, was calibrated using nearby PanSTARRS secondary standards and was not corrected for extinction.