GCN Circular 7816
Subject
GRB 080604: Swift-XRT refined analysis
Event
Date
2008-06-04T17:55:28Z (18 years ago)
From
Valentina La Parola at INAF-IASPA <laparola@ifc.inaf.it>
V. La Parola, B. Sbarufatti, V. Mangano (INAF-IASF Pa) report on behalf
of the Swift-XRT team
The Swift-XRT observed GRB 080604 (trigger 313116, La Parola et
al. GCN Circ 7800) for 6.3 ksec, starting 119.3 seconds after
the BAT trigger.
We detect an X-ray counterpart at the position
(astrometrically corrected using the XRT-UVOT alignment and matching UVOT field sources to the USNO-B1 catalogue): RA, Dec = 236.96516, +20.55777 which is equivalent to:
RA (J2000): 15h 47m 51.64s
Dec (J2000): +20d 33' 28.0"
with an uncertainty of 1.7 arcsec (radius, 90% confidence).
The X-ray light curve shows a power law decay with slope -2.18 +/-0.06, with a hint of a flare at ~T+1000 s.
The spectrum accumulated over the whole observation can be modelled with an absorbed powerlaw with the following parameters (Galactic nH is
4.0e20cm**-2):
nH = (8 +/- 4)e20 cm**-2
Gamma= 1.8 +/- 0.2
Flux (0.3-10 keV) 4.18E-12 ergs cm**-2 s**-1
Unabsorbed Flux (0.3-10 keV) = 4.9E-12 ergs cm**-2 s**-1
The predicted XRT count rate after 24 hours from the burst is 1.5e-5
counts/s
This circular is an official product of the Swift-XRT team.
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