GCN Circular 12162

N.P.M. Kuin (MSSL-UCL) and E. Sonbas (GSFC/USRA/Adiyaman Univ.)
report on behalf of the Swift/UVOT team:

The Swift/UVOT began settled observations of the field of GRB 110715A
100 s after the BAT trigger (Sonbas et al., GCN Circ. 12158
Not found
 
 
).

The preliminary UVOT position is:
  RA  (J2000) =  15:50:44.09 = 237.68369 (deg.)
  Dec (J2000) = -46:14:06.53 = -46.23515 (deg.)
with an estimated uncertainty of 0.56 arc sec. (radius, 90% confidence).

Preliminary detections and 3-sigma upper limits using the UVOT
photometric system
(Poole et al. 2008, MNRAS, 383, 627) for the early exposures are:

Filter         T_start(s)   T_stop(s)      Exp(s)           Mag

white              100          249          147         17.37 +/- 0.06
u                  312          501          187         17.86 +/- 0.09
b                 3734         3857          121         19.5  +/- 0.3
white             3960         4160          197         19.92 +/- 0.16
uvw2              4166         4366          197        >20.1
v                 4371         4571          197         19.3  +/- 0.3
uvm2              4576         6211          393        >20.3
uvw1              4781         6280          259        >20.1
u                 4986         5186          197         20.1  +/- 0.4
b                 5192         5391          197         19.9  +/- 0.2

The magnitudes in the table are not corrected for the Galactic extinction
due to the reddening of E(B-V) = 0.59 in the direction of the burst
(Schlegel et al. 1998).