Skip to main content
Announcing GCN Classic Migration Survey, End of Legacy Circulars Email. See news and announcements

GCN Circular 15266

Subject
GRB 130925A: Swift/UVOT Upper Limits
Date
2013-09-27T11:37:03Z (11 years ago)
From
Stephen Holland at STScI <sholland@stsci.edu>
S. T. Holland (STScI) and
A. Y. Lien (NASA/GSFC/ORAU)
report on behalf of the Swift/UVOT team:

    The Swift/UVOT began settled observations of the field of GRB
130925A 157 s after the BAT trigger (Lien et al. 2013, GCNC 15246).
We do not detect any new source consistent with the GROND afterglow
position (Sudilovsky et al. 2013, GCNC 15247) in any of the UVOT
exposures.  Preliminary 3-sigma upper limits, using the UVOT
photometric system (Breeveld et al. 2011, AIP Conf. Proc. 1358, 373),
for the finding chart and summed exposures are presented below.

---------------------------------------------------
Filter        TSTART     TSTOP   Exposure       Mag
---------------------------------------------------
white (FC)      157        306        147     >21.4
    u (FC)      315        564        246     >20.6
---------------------------------------------------
    v           645       7269        381     >20.0
    b           571       6121        170     >20.6
    u           719       5983        274     >20.4
 uvw1          5579     11,956        701     >21.1
 uvm2          5374     11,436       1082     >21.2
 uvw2          4964       7136        393     >20.7
white           595       6929        618     >22.0
---------------------------------------------------

    The quoted upper limits have not been corrected for the expected
extinction due to the Galactic reddening along the line of sight to
this burst of E(B-V) = 0.02 mag (Schlafly et al. 2011, ApJS, 737,
103).
Looking for U.S. government information and services? Visit USA.gov