TITLE:   GCN CIRCULAR
NUMBER:  29930
SUBJECT: GRB 210504A: update on the BAT trigger time and burst duration
DATE:    21/05/04 17:11:37 GMT
FROM:    Amy Lien at GSFC  <amy.y.lien@nasa.gov>

A. Y. Lien (GSFC/UMBC), A. P. Beardmore (U Leicester),
and K. L. Page (U Leicester) report on behalf of the Neil Gehrels
Swift Observatory Team:

We received further data from recent telemetry downlink.
The trigger time for GRB 210504A (Swift trigger #1046782;
Beardmore et al., GCN Circ. 29929) is
2021-05-04T13:54:53 UTC.

Based on currently available data from T-60 to T+63 sec,
the burst duration is longer than 50 seconds.