GCN Circular 24265
Subject
GRB 190427A: NOT optical observations
Date
2019-04-27T06:25:28Z (5 years ago)
From
Daniele Malesani at Dark Cosmology Centre, Niels Bohr Inst <malesani@dark-cosmology.dk>
L. Izzo (HETH/IAA-CSIC), D. B. Malesani (DAWN/NBI and DARK/NBI), D. Xu
(NAOC/CAS), and N. Jannsen (NOT), report:
We observed the field of the Swift GRB 190427A (Tohuvavohu et al., GCN
24261; Campana et al., GCN 24264) using the Nordic Optical Telescope
(NOT) located in La Palma (Canary Islands, Spain), equipped with the
ALFOSC camera. We have obtained a series of 2 exposures of 300 s each in
the SDSS r���, i��� and z��� filters.
The first r'-band image was acquired starting on 2019 Apr 27.19742 UT
(602 s after the GRB). Visual comparison with the Pan-STARRS archival
images reveals no new sources inside the BAT error circle, down to a
limiting magnitude r = 23.5 AB (calibrated against Pan-STARRS sources).
Further analysis is ongoing.