X-ray flare in XRF 050406: evidence for prolonged engine activity

Details X-ray flare in XRF 050406: evidence for prolonged engine activity X-ray flare in XRF 050406: evidence for prolonged engine activity

May 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006aipc..836..570r&link_type=abstract

GAMMA-RAY BURSTS IN THE SWIFT ERA: Sixteenth Maryland Astrophysics Conference. AIP Conference Proceedings, Volume 836, pp. 570-

Astronomy and Astrophysics

Astrophysics

X-Ray Sources, X-Ray Bursts, Gamma-Ray Sources, Gamma-Ray Bursts

Scientific paper

We present observations of XRF 050406, an X-ray flash with a relatively low fluence (~ 10-7 erg cm-2 in the 15-350 keV band), a soft spectrum (photon index Γγ = 2.65), no significant flux above ~ 50 keV and a peak energy Ep < 15 keV. XRF 050406 is the first burst detected by Swift clearly showing a flare in its X-ray light curve. The flare peaks 210 s after the BAT trigger, presents a flux variation δF/F ~ 6 in a timescale δt/tpeak << 1 and a measured fluence of 1-15% of the prompt one. We argue that the producing mechanism is late internal shocks, which implies that the central engine is still active at 210 s, though with a reduced power with respect to the prompt emission. The X-ray light curve flattens to a more shallow slope with a decay index of ~ 0.5 after ~ 4400 s, also supporting continued central engine activity.

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