Prompt Optical Detection of GRB 050401 with ROTSE-IIIa | Zendy

E. S. Rykoff | Zendy; S. A. Yost | Zendy; H. A. Krimm | Zendy; F. Aharonian | Zendy; C. Akerlof | Zendy; Katherine Alatalo | Zendy; M. C. B. Ashley | Zendy; S. D. Barthelmy | Zendy; N. Gehrels | Zendy; E. Göğüş | Zendy; T. Güver | Zendy; D. Horns | Zendy; Ü. Kıizıiloglu | Zendy; Timothy A. McKay | Zendy; M. E. Özel | Zendy; A. Phillips | Zendy; R. Quimby | Zendy; W. Rujopakarn | Zendy; Bradley 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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Prompt Optical Detection of GRB 050401 with ROTSE-IIIa

Author(s) -

E. S. Rykoff,

S. A. Yost,

H. A. Krimm,

F. Aharonian,

C. Akerlof,

Katherine Alatalo,

M. C. B. Ashley,

S. D. Barthelmy,

N. Gehrels,

E. Göğüş,

T. Güver,

D. Horns,

Ü. Kıizıiloglu,

Timothy A. McKay,

M. E. Özel,

A. Phillips,

R. Quimby,

W. Rujopakarn,

Bradley E. Schaefer,

D. A. Smith,

H. Swan,

W. T. Vestrand,

J. C. Wheeler,

J. Wren

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 - 10.1086/497370

Subject(s) - afterglow , gamma ray burst , physics , astrophysics , observatory , telescope , luminosity , observable , swift , astronomy , galaxy , quantum mechanics

The ROTSE-IIIa telescope at Siding Spring Observatory, Australia, detectedprompt optical emission from Swift GRB 050401. In this letter, we presentobservations of the early optical afterglow, first detected by the ROTSE-IIIatelescope 33 s after the start of gamma-ray emission, contemporaneous with thebrightest peak of this emission. This GRB was neither exceptionally long norbright. This is the first prompt optical detection of a GRB of typical durationand luminosity. We find that the early afterglow decay does not deviatesignificantly from the power-law decay observable at later times, and isuncorrelated with the prompt gamma-ray emission. We compare this detection withthe other two GRBs with prompt observations, GRB 990123 and GRB 041219a. Allthree bursts exhibit quite different behavior at early times.Comment: 4 pages, 3 figures. Accepted for publication in ApJ Letter

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