GCN Circular 40181
Subject
GRB 250419A: Liverpool Telescope observations
Date
2025-04-20T07:27:45Z (4 days ago)
From
Daniel Perley at Liverpool JMU <d.a.perley@ljmu.ac.uk>
Via
Web form
D. A. Perley and A. Bochenek (LJMU) report:
We obtained imaging observations of the SVOM-detected GRB250419A (Wang et al., GCN 40168) with IO:O on the Liverpool Telescope on the night of 2025-04-19 between 22:02 and 22:26 UT. 6x100s exposures were acquired in both SDSS r-band and SDSS i-band. We clearly detect the optical counterpart (e.g. Ocelotl López et al., GCN 40169; Xin et al., GCN 40170) at the following magnitudes, calibrated using PanSTARRS secondary standards:
MJD dt filter mag +/- unc
60784.91810 0.814 r 19.96 +/- 0.06
60784.92664 0.822 i 19.76 +/- 0.06