SwiftUVOT Detection of GRB 050318 | Zendy

M. Still | Zendy; P. W. A. Roming | Zendy; K. O. Mason | Zendy; A. J. Blustin | Zendy; Patricia T. Boyd | Zendy; A. A. Breeveld | Zendy; P. J. Brown | Zendy; M. de Pasquale | Zendy; C. Gronwall | Zendy; S. T. Holland | Zendy; S. Hunsberger | Zendy; M. Ivanushkina | Zendy; Cynthia H. James | Zendy; V. La Parola | Zendy; K. McGowan | Zendy; A. Morgan | Zendy; T. Poole | Zendy; S. R. Rosen | Zendy; P. Schady | Zendy; Bing Zhang | Zendy; H. A. Krimm | Zendy; T. Sakamoto | Zendy; P. Giommi | Zendy; M. R. Goad | Zendy; V. Mangano | Zendy; K. L. Page | Zendy; M. Perri | Zendy; D. N. Burrows | Zendy; N. Gehrels | Zendy; J. A. Nousek | Zendy

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SwiftUVOT Detection of GRB 050318

Author(s) -

M. Still,

P. W. A. Roming,

K. O. Mason,

A. J. Blustin,

Patricia T. Boyd,

A. A. Breeveld,

P. J. Brown,

M. de Pasquale,

C. Gronwall,

S. T. Holland,

S. Hunsberger,

M. Ivanushkina,

Cynthia H. James,

V. La Parola,

K. McGowan,

A. Morgan,

T. Poole,

S. R. Rosen,

P. Schady,

Bing Zhang,

H. A. Krimm,

T. Sakamoto,

P. Giommi,

M. R. Goad,

V. Mangano,

K. L. Page,

M. Perri,

D. N. Burrows,

N. Gehrels,

J. A. Nousek

Publication year - 2005

Publication title -

the astrophysical journal

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 2.376

H-Index - 489

eISSN - 1538-4357

pISSN - 0004-637X

DOI - 10.1086/497627

Subject(s) - physics , gamma ray burst , astrophysics , swift , afterglow , redshift , photometry (optics) , observatory , telescope , optical telescope , extinction (optical mineralogy) , astronomy , optics , galaxy , stars

We present observations of GRB 050318 by the Ultra-Violet and OpticalTelescope (UVOT) on-board the Swift observatory. The data are the firstdetections of a Gamma Ray Burst (GRB) afterglow decay by the UVOT instrument,launched specifically to open a new window on these transient sources. Weshowcase UVOTs ability to provide multi-color photometry and the advantages ofcombining UVOT data with simultaneous and contemporaneous observations from thehigh-energy detectors on the Swift spacecraft. Multiple filters covering1,800-6,000 Angstroms reveal a red source with spectral slope steeper than thesimultaneous X-ray continuum. Spectral fits indicate that the UVOT colors areconsistent with dust extinction by systems at z = 1.2037 and z = 1.4436,redshifts where absorption systems have been pre-identified. However, the datacan be most-easily reproduced with models containing a foreground system ofneutral 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 fireballexpansion into a uniform medium, provided a cooling break occurs between theenergy ranges of the UVOT and Swifts X-ray instrumentation.Comment: 15 pages, 4 figures, ApJ Letters, in pres

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