TITLE:   GCN CIRCULAR
NUMBER:  26913
SUBJECT: GRB200127A: Nordic Optical telecope optical upper limit
DATE:    20/01/28 10:21:58 GMT
FROM:    Johan Fynbo at Neils Bohr Institute  <jfynbo@nbi.ku.dk>

Johan P. U. Fynbo (DAWN/NBI), Daniele B. Malesani (DTU Space), Kasper E. Heintz (Univ. Iceland), Luca Izzo (DARK/NBI), Amanda Djupvik (NOT), report on behalf of a larger collaboration:

On 2020 Jan 28.292 UT (16.274 hr after the GRB) we observed the field of GRB200127A (Moss et al., GCN 26895; Evans et al., GCN26902) with the Nordic Optical Telescope in the SDSS r-filter for a total integration time of 900 s. Within the XRT position, we find no evidence for afterglow emission above a 3-sigma limit of about 23 mag AB, calibrated against field stars from the PAN-STARRS catalog.