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Swift-UVOT detection of GRB 050318 | | M. Still
; P.W.A. Roming
; K.O. Mason
; A. Blustin
; P. Boyd
; A. Breeveld
; P. Brown
; M. De Pasquale
; C. Gronwall
; S.T. Holland
; S. Hunsberger
; M. Ivanushkina
; C. James
; W. Landsman
; K. McGowan
; A. Morgan
; T. Poole
; S. Rosen
; P. Schady
; B. Zhang
; H. Krimm
; T. Sakamoto
; P. Giommi
; M.R. Goad
; V. Mangano
; K. Page
; M. Perri
; D.N. Burrows
; N. Gehrels
; J. Nousek
; | | Date: |
2 Sep 2005 | | Subject: | astro-ph | | Affiliation: | NASA/GSFC), P.W.A. Roming (PSU), K.O. Mason (MSSL), A. Blustin (MSSL), P. Boyd (NASA/GSFC), A. Breeveld (MSSL), P. Brown (PSU), M. De Pasquale (MSSL), C. Gronwall (PSU), S.T. Holland (NASA/GSFC), S. Hunsberger (PSU), M. Ivanushkina (PSU), C. James (MSS | | Abstract: | We present observations of GRB 050318 by the Ultra-Violet and Optical Telescope (UVOT) on-board the Swift observatory. The data are the first detections of a Gamma Ray Burst (GRB) afterglow decay by the UVOT instrument, launched specifically to open a new window on these transient sources. We showcase UVOTs ability to provide multi-color photometry and the advantages of combining UVOT data with simultaneous and contemporaneous observations from the high-energy detectors on the Swift spacecraft. Multiple filters covering 1,800-6,000 Angstroms reveal a red source with spectral slope steeper than the simultaneous X-ray continuum. Spectral fits indicate that the UVOT colors are consistent with dust extinction by systems at z = 1.2037 and z = 1.4436, redshifts where absorption systems have been pre-identified. However, the data can be most-easily reproduced with models containing a foreground system of neutral gas redshifted by z = 2.8 +/- 0.3. For both of the above scenarios, spectral and decay slopes are, for the most part, consistent with fireball expansion into a uniform medium, provided a cooling break occurs between the energy ranges of the UVOT and Swifts X-ray instrumentation. | | Source: | arXiv, astro-ph/0509060 | | Services: | Forum | Review | PDF | Favorites | |
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