[vsnet-grb-info 6684] Swift trigger 325707: Swift-XRT upper limit
GCN Circulars
gcncirc at capella.gsfc.nasa.gov
Wed Sep 24 18:27:36 JST 2008
TITLE: GCN CIRCULAR
NUMBER: 8286
SUBJECT: Swift trigger 325707: Swift-XRT upper limit
DATE: 08/09/24 09:27:20 GMT
FROM: Valentina La Parola at INAF-IASPA <laparola at ifc.inaf.it>
V. Mangano, B. Sbarufatti, V. La Parola (INAF-IASFPa), on behalf of the Swift-XRT team
The XRT started observing the field of the BAT trigger 325707
(Immler et al., GCN Circ. 8285) on 2008-09-23, at 21:50:46UT,
80.1s after the BAT trigger.
No X-ray source was found in or near the BAT error circle in a 3.3 ks
exposure (17 ksec elapsed time) Swift/XRT Photon Counting mode image
down to a 3 sigma limiting 0.3-10keV count
rate of 3.67e-3 count/s. Assuming a power-law spectrum of photon index 2
absorbed by the Galactic column density of 2.16e21 cm-2 at the position
of the BAT trigger, this corresponds to an observed 0.3-10 keV flux limit of
1.50e-13 erg cm-2 s-1.
This circular is an official product of the Swift-XRT team.
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