GCN Circular 22988
Subject
GRB 180720B: LCO optical afterglow observations
Event
Date
2018-07-21T04:59:42Z (7 years ago)
From
Daniele Malesani at Dark Cosmology Centre, Niels Bohr Inst <malesani@dark-cosmology.dk>
Nicolas Crouzet (IAC) and Daniele B. Malesani (DAWN/NBI and DARK/NBI)
report:
We observed the optical afterglow of GRB 180720B (Siegel et al., GCN
22973; Martone et al., GCN 22976) using the 0.4-m telescope located at
the Teide Observatory, part of the Las Cumbres Observatory (LCO)
telescope network.
A single 600-s exposure in the SDSS r band was obtained with mean time
July 21.094 UT (0.495 days after the GRB). The PSF of the image is not
optimal, being double-peaked.
Aperture photometry, compared to nearby stars from the Pan-STARRS
catalog, provides for the afterglow a preliminary magnitude r = 17.85 +-
0.10 AB.