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@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.