GCN Circular 40000
Subject
GRB 250219A: NOT candidate host galaxy detection
Date
2025-04-01T09:28:18Z (12 days ago)
From
Daniele B. Malesani at IMAPP / Radboud University <d.malesani@astro.ru.nl>
Via
Web form
Daniele B. Malesani (DAWN/NBI and Radboud Univ.), Benjamin Schneider (LAM), Gregory Corcoran (UCD), A. Martin-Carrillo (UCD), and Nikko Pyykkinen (NOT and Turku) report on behalf of a larger collaboration:
We observed the field of GRB 250219A (Daigne et al., GCN 39376) using the Nordic Optical Telescope (NOT) equipped with the ALFOSC imager. Observations were carried out with the r-band filter and started on 2025 March 26 at 02:18 UT (34.4 days after the GRB), for a total of 50 min on source. Seeing and Moon conditions were favorable.
Consistent with the position of the optical afterglow (Xin et al., GCN 39380; Magnani et al., GCN 39382; Fu et al., GCN 39383), we detect a faint object with AB magnitude r = 25.2 +- 0.3, calibrated against nearby objects from Pan-STARRS.
While we note a slight offset (~0.9") compared to the afterglow position (Fu et al., GCN 39383), we suggest the above object to be a candidate host galaxy of GRB 250219A.
We thank Liping Xin, Francis Fortin and Susanna Vergani for helpful discussion.