TITLE: GCN CIRCULAR NUMBER: 40238 SUBJECT: GRB 250419A: Liverpool Telescope optical upper limit DATE: 25/04/24 15:05:29 GMT FROM: Dimple at University of Birmingham dimplepanchal96@gmail.com
Dimple and B. P. Gompertz (U. Birmingham) report:
We conducted follow-up observations of GRB 250419A (Wang et al., GCN 40168) with the IO:O camera on the 2m robotic Liverpool Telescope (LT). Observations began at 21:52:15.745 UT on 2025-04-23 and consisted of 5x120 s exposures in each of the SDSS g and r filters. We do not detect the optical afterglow (López et al., GCN 40169; Xin et al., GCN 40170; Zheng et al., GCN 40171; Kumar et al., GCN 40172; Thakur et al., GCN 40174; Lipunov et al., GCN 40179; Odeh et al., GCN 40180; Perley & Bochenek, GCN 40181; Pankov et al., GCN 40182; Pérez-Fournon et al., GCN 40183; Kuin et al., GCN 40185; Wu et al., GCN 40186; Xie et al., GCN 40187; Jiang et al., GCN 40188; Ghosh et al., GCN 40189; Bochenek & Perley, GCN 40190; Pankov et al., GCN 40202; Masi, GCN 40206; Calapai, GCN 40209) to 3-sigma limiting AB magnitudes of g > 22.42 and r >22.45, at a mid-time of 4.82 days after trigger. Observations were calibrated against nearby Pan-STARRS stars and are not corrected for foreground extinction.
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