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GCN Circular 11612

Subject
GRB 110128A: Swift/UVOT observations
Date
2011-01-28T15:44:03Z (13 years ago)
From
Samantha Oates at MSSL <sro@mssl.ucl.ac.uk>
S. R. Oates (MSSL-UCL) & D. Grupe (PSU) report on behalf of the Swift- 
UVOT team

The Swift/UVOT began settled observations of the field of GRB 110128A
144 s after the BAT trigger (Grupe et al., GCN Circ. 11603). The optical
afterglow is detected in the first white and u exposures at a refined
UVOT position RA(J2000)=  193.89625 deg, DEC(J2000) = 28.06503,
which is:

      RA (J2000)  12:55:35.10
     Dec (J2000)  28:03:54.1

with an estimated uncertainty of 1.3 arcsec (radius, 90% confidence).
This position is consistent with the optical afterglow detection by
NOT (de Ugarte Postigo., GCN Circ 11605) and the enhanced XRT
position (Osborne et al., GCN Circ. 11606).

Preliminary magnitudes using the UVOT photometric system (Poole et al.  
2008,
MNRAS, 383, 627) for single and summed exposures are:

Filter  T_start(s)  T_stop(s)   Exp(s)       Mag/3sigUL
#####################################################
wh (FC)   144          294       147      20.98 +/- 0.29
u  (FC)   302          552  	 246      20.32 +/- 0.35
wh        582         6352       580        > 21.89
v         632         6763       432        > 20.09
u         707         5943       412        > 20.95
b         558         6148       432        > 21.32
uvw1      682         5738       221        > 20.34
uvm2      658         6874       340        > 20.43
uvw2      608         6558       393        > 20.88
#####################################################

The values quoted above are not corrected for the Galactic extinction
due to the reddening of E(B-V) = 0.01 in the direction of the burst
(Schlegel et al. 1998).
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