TITLE:   GCN CIRCULAR
NUMBER:  29854
SUBJECT: GRB 210420B: update on the BAT trigger time
DATE:    21/04/21 02:52:39 GMT
FROM:    Amy Lien at GSFC  <amy.y.lien@nasa.gov>

A. Y. Lien (GSFC/UMBC), M. J. Moss (GWU),
and A. Tohuvavohu (U Toronto)
report on behalf of the Neil Gehrels Swift
Observatory Team:

We received further data from recent telemetry downlink,
The trigger time for GRB 210420B (Swift trigger #1044382;
Moss et al., GCN Circ. 29844) is
2021-04-20T18:34:37 UTC.

The burst duration is at least 30 seconds, the full data
products will allow a complete duration estimate.