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