GCN Circular 29872
Subject
GRB 210420B: Montarrenti Observatory follow-up observations
Event
Date
2021-04-21T21:17:34Z (5 years ago)
From
Simone Leonini at Monarrenti Obs <s.leonini@iol.it>
Simone Leonini, M. Conti, P. Rosi and L.M. Tinjaca Ramirez (Montarrenti Observatory, Siena, Italy) report:
In reference to the GRB 210420B (Moss, et al., GCN 29844), as a follow-up of our early observations already reported in GCN 29851, we kept on imaging the afterglow until 2021-04-21 02:49:13 UT with the same conditions, set-up and analysis. Here our complete set of measurements:
2021 Apr 20.99207 UT (23:48:35 mid-time) R=19.0 +/-0.13
2021 Apr 21.03089 UT (00:44:29 mid-time) R=19.2 +/-0.14
2021 Apr 21.06793 UT (01:37:49 mid-time) R=19.1 +/-0.14
2021 Apr 21.11587 UT (02:46:51 mid-time) R=19.5 +/-0.12
Along the span of our observations we estimate from our measurements a decay rate of 1.02+/-0.35.