GRB 050421: A possible naked burst with X-ray flares

Details GRB 050421: A possible naked burst with X-ray flares GRB 050421: A possible naked burst with X-ray flares

May 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006aipc..836..281g&link_type=abstract

GAMMA-RAY BURSTS IN THE SWIFT ERA: Sixteenth Maryland Astrophysics Conference. AIP Conference Proceedings, Volume 836, pp. 281-

Astronomy and Astrophysics

Astrophysics

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

Scientific paper

We present Swift observations of the faint burst GRB 050421. The X-ray light-curve shows two flares: the first peaking at ~ 110 s after the BAT trigger (T0) and the second one peaking at ~ 154 s. We argue that the mechanism producing these flares is probably late internal shocks. The X-ray light-curve is consistent with a power-law with a temporal index α1 ~ 3.1. The X-ray flux decays from ~ 10-9 erg cm-2 s-1 at T0 + 100 s to < 7 × 10-13 erg cm-2 s-1 at T0 + 1000 s. An X-ray spectral softening is also observed with time from β ~ 0.1 to ~ 1.2, where β is the spectral index such as Fv ~ v-βt-α. A good joint fit to the BAT and XRT spectra indicates that the early X-ray and Gamma-ray emissions are produced by the same mechanism. The X-ray spectral softening is likely due to a shift down to lower energies of the peak of the prompt emission, and the rapid decline of the X-ray emission is probably the tail of the prompt emission. This suggests that the X-ray emission is completely dominated by high latitude radiation and the external shock, if any, is extremely faint and below the detection threshold. GRB 050421 is likely the first ``naked burst'' detected by Swift.

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