Early‐Time Observations of the GRB 050319 Optical Transient | Zendy

R. Quimby | Zendy; E. S. Rykoff | Zendy; S. A. Yost | Zendy; Felix Aharonian | Zendy; C. W. Akerlof | Zendy; Katherine Alatalo | Zendy; M. C. B. Ashley | Zendy; E. Göğüş | Zendy; T. Güver | Zendy; D. Horns | Zendy; R. Kehoe | Zendy; U. Kιzιloğlu | Zendy; T. A. McKay | Zendy; M. E. Özel | Zendy; A. Phillips | Zendy; B. E. Schaefer | Zendy; D. A. Smith | Zendy; H. Swan | Zendy; W. T. Vestrand | Zendy; J. C. Wheeler | Zendy; J. Wren | Zendy

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Early‐Time Observations of the GRB 050319 Optical Transient

Author(s) -

R. Quimby,

E. S. Rykoff,

S. A. Yost,

Felix Aharonian,

C. W. Akerlof,

Katherine Alatalo,

M. C. B. Ashley,

E. Göğüş,

T. Güver,

D. Horns,

R. Kehoe,

U. Kιzιloğlu,

T. A. McKay,

M. E. Özel,

A. Phillips,

B. E. Schaefer,

D. A. Smith,

H. Swan,

W. T. Vestrand,

J. C. Wheeler,

J. Wren

Publication year - 2006

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 - 10.1086/499803

Subject(s) - afterglow , gamma ray burst , transient (computer programming) , swift , power law , light curve , physics , astrophysics , power (physics) , law , computer science , statistics , political science , mathematics , quantum mechanics , operating system

We present the unfiltered ROTSE-III light curve of the optical transientassociated with GRB 050319 beginning 4 s after the cessation of gamma-rayactivity. We fit a power-law function to the data using the revised triggertime given by Chincarini et al. (2005), and a smoothly broken power-law to thedata using the original trigger disseminated through the GCN notices. Includingthe RAPTOR data from Wozniak et al. (2005), the best fit power-law indices arealpha=-0.854 (+/- 0.014) for the single power-law and alpha_1=-0.364 (+/-0.020), alpha_2= -0.881 (+/- 0.030), with a break at t_b = 418 (+/- 30) s forthe smoothly broken fit. We discuss the fit results with emphasis placed on theimportance of knowing the true start time of the optical transient for thismulti-peaked burst. As Swift continues to provide prompt GRB locations, itbecomes more important to answer the question, "when does the afterglow begin"to correctly interpret the light curves.Comment: 14 pages including 2 figures; Accepted for publication in Ap

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