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GCN Circular 3052

Subject
GRB050219b: CORRECTION to time of UVOT observations
Date
2005-02-21T20:34:24Z (19 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.
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