GCN Circular 3052
Subject
GRB050219b: CORRECTION to time of UVOT observations
Event
Date
2005-02-21T20:34:24Z (22 years ago)
From
Patricia Schady at MSSL/Swift <ps@mssl.ucl.ac.uk>
T. Poole (MSSL), C. Gronwall (PSU), A. Blustin (MSSL), P. Brown (PSU), S.
Rosen, K. McGowan, M. De Pasquale (MSSL), P. Boyd (GSFC/UMBC), S. Holland,
M. Still (GSFC/USRA), W. Landsman (GSFC), S. Hunsberger (PSU), A. Breeveld
(MSSL), P. Roming (PSU), K. Mason, P. Schady (MSSL), M. Ivanushkina (PSU),
T. Kennedy, P. Smith, B. Hancock (MSSL), S. Koch (PSU), M. Carter, H.
Huckle (MSSL), P. Broos, J. Racusin (PSU), E. Fenimore (LANL),
B. Zhang (UNLV), J. Nousek (PSU), N. Gehrels (GSFC), on behalf of the
Swift UVOT team.
CORRECTION: The time at which the UVOT began observations of GRB050219b
should read as 21:57:51 in GCN 3046 and GCN 3050. This was 52 minutes
after the initial Swift BAT trigger (Cummings et al, GCN 3044), the delay
being caused by the Earth-limb constraint.
No new source was detected at the corrected XRT position (Racusin et al,
GCN 3049), and the 3-sigma limiting magnitudes given in GCN 3050 still
apply:
Filter Lim_Mag Tot_Exposure(s) T_start (s)
UVW2 ~ 22.16 1154 T+3120
UVM2 ~ 22.24 1435 T+3243
UVW1 ~ 22.23 940 T+3349
U ~ 20.74 100 T+3455
B ~ 20.9 100 T+3561
V ~ 19.41 100 T+3136
We caution that the instrument is not yet fully calibrated and that the
magnitude limits presented here may need to be refined.