GCN Circular 27842
Subject
GRB 200528A: NOT optical upper limits
Date
2020-05-29T00:02:50Z (4 years ago)
From
Daniele B Malesani at DTU Space <malesani@space.dtu.dk>
D. B. Malesani (DTU Space), J. P. U. Fynbo (DAWN/NBI), L. Izzo
(DARK/NBI), D. Xu (NAOC/CAS), T. Pursimo (NOT), report on behalf of a
larger collaboration:
We observed the field of GRB 200528A (Ambrosi et al., GCN 27832) using
the Nordic Optical Telescope (NOT) equipped with the ALFOSC camera.
Observations were carried out under variable, thin clouds. After
stacking the good images in each filter, no afterglow is visible in
either band within the XRT position (Evans et al., GCN 27836). At mean
epochs May 28.926 and 28.927 UT (11.78 and 11.80 hr after the GRB,
respectively), we derive limiting magnitudes r > 23.5 and z > 22 AB
(calibrated against nearby stars in the Pan-STARRS catalog).
We note that the galaxy visible in the archival surveys and noted by de
Ugarte Postigo & Kann (GCN 27833) is about 10.6 arcsec away of the
UVOT-enhanced XRT position (1.5" error; Evans et al., GCN 27836), and is
thus likely unrelated to the GRB.