[vsnet-grb-info 13961] GRB 130929A: Swift/UVOT Upper Limits

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  15275
SUBJECT: GRB 130929A: Swift/UVOT Upper Limits
DATE:    13/09/30 18:07:07 GMT
FROM:    Frank Marshall at GSFC  <femarsha at khamseen.gsfc.nasa.gov>

F. E. Marshall (NASA/GSFC) reports on behalf of the Swift/UVOT team:

The Swift/UVOT began settled observations of the field of GRB 130929A
280 s after the BAT trigger (Marshall et al., GCN Circ. 15269).
No optical afterglow consistent with the XRT position
(Goad et al. GCN Circ. 15271) is detected in the initial UVOT exposures.
Preliminary 3-sigma upper limits using the UVOT photometric system
(Breeveld et al. 2011, AIP Conf. Proc. 1358, 373) for the first
finding chart (FC) exposure and subsequent exposures are:

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

white_FC           280          430          147         >21.0
white              280         1008          334         >21.4
v                  586         4628          236         >19.7
b                  512          705           39         >19.0
u                  487        10592          709         >20.6
w1                 462         6710          255         >19.6
m2                 437         6505          308         >19.7
w2                 562         4423          236         >19.7

The magnitudes in the table are not corrected for the 
large Galactic extinction in the direction of the burst
(Schlegel et al. 1998).