TITLE: GCN CIRCULAR NUMBER: 30271 SUBJECT: GRB 210619B: Liverpool telescope imaging of a red afterglow DATE: 21/06/20 11:14:52 GMT FROM: Daniel Perley at Liverpool JMU D. A. Perley (LJMU) reports: We acquired multicolor imaging of the optical afterglow of GRB 210619B (D'Avanzo et al., GCN 30261) using the IO:O camera of the 2m robotic Liverpool Telescope. The afterglow was observed twice in the ugriz filters on 2021-06-20 UT, with the first epoch taking place between 02:35:06 and 02:42:40 and the second between 03:49:15 and 03:56:49. Photometry with reference to Pan-STARRS 1 secondary standard stars in the field gives the following magnitudes: t-tburst(d) filter mag unc 0.10772 g 18.58 0.03 0.10879 r 17.82 0.03 0.10984 i 17.44 0.04 0.11227 z 17.17 0.04 0.15920 g 18.93 0.03 0.16028 r 18.11 0.03 0.16133 i 17.74 0.04 0.16376 z 17.47 0.04 These values have not been corrected for Galactic extintion. The colors (after applying a Galactic extinction correction) suggest a moderately dust-reddened afterglow. DisclaimerNone