TITLE: GCN CIRCULAR NUMBER: 40181 SUBJECT: GRB 250419A: Liverpool Telescope observations DATE: 25/04/20 07:27:45 GMT FROM: Daniel Perley at Liverpool JMU d.a.perley@ljmu.ac.uk
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
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