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Swift-UVOT Observations of the X-Ray Flash 050406 | | P. Schady
; K. O. Mason
; J. P. Osborne
; M. J. Page
; P. W. A. Roming
; M. Still
; B. Zhang
; A. J. Blustin
; P. Boyd
; A. Cucchiara
; N. Gehrels
; C. Gronwall
; M. De Pasquale
; S. T. Holland
; F. E. Marshall
; K. E. McGowan
; J. A. Nousek
; | | Date: |
9 Jan 2006 | | Abstract: | We present Swift-UVOT data on the optical afterglow of the X-ray flash of 2005 April 6 (XRF 050406) from 88s to sim 10^5s after the initial prompt gamma-ray emission. Our observations in the V, B and U bands are the earliest that have been taken of an XRF optical counterpart. Combining the early -time optical temporal and spectral properties with gamma- and simultaneous X-ray data taken with the BAT and XRT telescopes on-board Swift, we are able to constrain possible origins of the XRF. The prompt emission had a FRED profile (fast-rise, exponential decay) with a duration of T_90 = 5.7pm 0.2s, putting it at the short end of the long-burst duration distribution. The absence of photoelectric absorption red-ward of 4000 AA in the UV/optical spectrum provides a firm upper limit of zleq 3.1 on the redshift, thus excluding a high redshift as the sole reason for the soft spectrum. The optical light curve is consistent with a power-law decay with slope alpha = -0.75pm 0.26 (F_{
u}propto t^{alpha}), and a maximum occurring in the first 200s after the initial gamma-ray emission. The softness of the prompt emission is well described by an off-axis structured jet model, which is able to account for the early peak flux and shallow decay observed in the optical and X-ray bands. | | Source: | arXiv, astro-ph/0601182 | | Services: | Forum | Review | PDF | Favorites | |
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