GCN Circular 37134
Subject
GRB240809A: Liverpool Telescope optical follow-up observations
Date
2024-08-10T21:29:26Z (7 months ago)
From
A. Bochenek at Liverpool John Moores University <a.m.bochenek@2023.ljmu.ac.uk>
Via
Web form
A. Bochenek and D. A. Perley (LJMU) report:
We observed the Gamma-Ray Burst GRB240809A (Evans et al. GCN 37110 ; Want et al. GCN37113) using the IO:O optical camera on the 2m robotic Liverpool Telescope. We obtained 5x120s exposures with the SDSS-R and SDSS-I filters starting at 2024-08-09 21:48:46 UT, approximately 13.3 hours after the trigger.
The afterglow is detected in every exposure at a position consistent with previous detections reported by Dubay et al. (GCN 37114) and Jiang et al. (GCN 37116). The obtained results are given below:
MJD (mid) T_mid - T_0 Filter Mag. (AB)
60531.91279 13.40 h r 20.54 ± 0.05
60531.18419 13.60 h i 20.43 ± 0.05
The photometry was obtained using nearby PanSTARRS secondary standards and was not corrected for extinction.