GCN Circular 7750
Subject
GRB 080514B: second epoch Swift XRT data confirms the X-ray afterglow
Date
2008-05-19T10:23:12Z (16 years ago)
From
Paolo Esposito at INAF-IASF,Milano <paoloesp@iasf-milano.inaf.it>
P. Esposito, A. De Luca, A. Tiengo, G. Vianello (INAF-IASF MI),
K.L. Page (U. Leicester) report:
GRB 080514B was discovered by the SuperAGILE detector on May
14th, at 09:55:56 UT (Rapisarda et al., GCN Circ. 7715) and
possibly detected at energies E>50 MeV in AGILE GRID data
(Giuliani et al., GCN Circ. 7716).
The first Swift/XRT observation was performed on May 14th at
20:12, starting about 37 ks after the GRB trigger (Page et al.,
GCN Circ. 7723). A likely afterglow candidate was found, with a
flux decay described by a power-law (slope: 1.5+/-1.0; GCN Circ.
7723). The spectrum was modelled with an absorbed ( 1.2x10^21 cm^-2)
power-law, with photon index = 2.06 (GCN Circ. 7723).
Swift/XRT observed again the field of GRB 080514B on May 16th at
20:13, about 58 hours after the trigger. 6 ks of data in Photon
Counting mode were collected in three consecutive orbits, spanning
5 hours.
The candidate X-ray afterglow (GCN Circ. 7723) is significantly
detected with a 0.3-10 keV observed flux of (1.9+/-0.8)x10^-13
erg cm^-2 s^-1 (assuming the spectrum of Circ. 7723).
The new XRT data confirm the fading trend reported in (GCN Circ.
7723) and better constrain the decay slope at 1.6 +0.3/-0.2.
We thank the Swift PI, N. Gehrels, for approval of this TOO, and
the the Swift team (in particular the duty scientists and science
planners) for performing it.