[vsnet-grb-info 13405] Swift/UVOT observations of GRB130603A

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  14738
SUBJECT: Swift/UVOT observations of GRB130603A
DATE:    13/06/03 19:36:24 GMT
FROM:    Massimiliano de Pasquale at MSSL-UCL  <m.depasquale at ucl.ac.uk>

M. De Pasquale (MSSL/UCL) and A. Melandri (INAF/OAB) report on behalf
of the Swift/UVOT team:

The Swift/UVOT began settled observations of the field of GRB 130603A
3325 s after the BAT trigger (Melandri et al., GCN Circ. 14731). The
uncatalogued source reported in Melandri et al., GCN Circ. 14732, is
detected in the summed exposures.

Preliminary detections and 3-sigma upper limits using the UVOT
photometric system (Breeveld et al. 2011, AIP Conf. Proc. 1358, 373) for
the summed exposures are:

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

white         3686       5322       393       19.61 ± 0.15
v             4097       5562       197      >19.02
b             3481      16641      1278       19.71 ± 0.15
u             3275      15729      1278       19.19 ± 0.13
uvw1          4507       4707       197       19.62 ± 0.39 (2.8 sigma)
uvm2          4302       4502       197      >19.63
uvw2          3892       5528       393       20.25 ± 0.37 (2.8 sigma)

The possible detection of the optical source in uw2 filter indicates
a redshift z < ~1.5 for this event.

The magnitudes in the table are not corrected for the Galactic
extinction due to the reddening of E(B-V) = 0.06 in the direction of
the burst (Schlegel et al. 1998).