[vsnet-grb-info 10470] GRB110407A: UVOT Upper Limits

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  11907
SUBJECT: GRB110407A: UVOT Upper Limits
DATE:    11/04/08 12:05:39 GMT
FROM:    Samantha Oates at MSSL  <sro at mssl.ucl.ac.uk>

S. R. Oates (MSSL-UCL) & C. W. Wolf (PSU) report on behalf of the 
Swift-UVOT team

The Swift/UVOT began settled observations of the field of GRB 110407A 168s
after the trigger (Wolf et al., GCN Circ. 11895). We do not detect a 
source at the position of the X-ray (Evans et al., GCN Circ. 11896, 11903) 
or optical afterglow reported by Lulin (Chuang et al, GCN Circ. 11899, 
11901), NOT (Malesani et al., GCN Circ. 11904) and GROND (Kann et al, GCN 
Circ. 11906).

Preliminary magnitudes using the UVOT photometric system (Poole et al. 
2008,MNRAS, 383, 627) for the finding chart (FC) and summed exposures at the
location of the optical afterglow are:

Filter  T_start(s)  T_stop(s)   Exp(s)       Mag/3sigUL
#####################################################
wh (FC)    168        317       147          >20.82
wh	   607        6514      580          >21.59
u (FC)	   327        577       246          >20.11
u          732        6104      413          >20.41
v          658        6873      382          >19.74
b	   583        6309      432          >20.75
uvw1	   708        5899      413          >20.34
uvm2	   5493       5693      197          >19.75
uvw2       808        6719      413          >20.68
#####################################################

The values quoted above are not corrected for the Galactic extinction
due to the reddening of E(B-V) = 0.03 in the direction of the burst
(Schlegel et al. 1998).