| | |
| | |
Stat |
Members: 3643 Articles: 2'488'730 Articles rated: 2609
29 March 2024 |
|
| | | |
|
Article overview
| |
|
GRB 071003: Broadband Follow-up Observations of a Very Bright Gamma-Ray Burst in a Galactic Halo | D. A. Perley
; W. Li
; R. Chornock
; J. X. Prochaska
; N. R. Butler
; P. Chandra
; L. K. Pollack
; J. S. Bloom
; A. V. Filippenko
; C. Akerlof
; M. W. Auger
; S. B. Cenko
; H.-W. Chen
; C. D. Fassnacht
; D. Fox
; D. Frail
; E. M. Johansson
; D. Le Mignant
; M. Modjaz
; M. A. Skinner
; G. H. Smith
; H. Swan
; M. A. van Dam
; F. Yuan
; | Date: |
15 May 2008 | Abstract: | The optical afterglow of long-duration gamma-ray burst (GRB) 071003 is among
the brightest yet to be detected from any GRB, with R ~ 12 mag in Katzman
Automatic Imaging Telescope observations starting 42 s after the GRB trigger,
including filtered detections during prompt emission. However, our high
signal-to-noise ratio afterglow spectrum displays only extremely weak
absorption lines at what we argue is the host redshift of z=1.60435 - in
contrast to the three other, much stronger Mg II absorption systems observed at
lower redshifts. Together with Keck Adaptive Optics observations which fail to
reveal a host galaxy coincident with the burst position, our observations
suggest a halo progenitor and offer a cautionary tale about the use of Mg II
for GRB redshift determination. We present early through late-time observations
spanning the electromagnetic spectrum, constrain the connection between the
prompt emission and early variations in the light curve (we observe no
correlation), and discuss possible origins for an unusual, marked rebrightening
that occurs a few hours after the burst: likely either a late-time refreshed
shock or a wide-angle secondary jet. Analysis of the late-time afterglow is
most consistent with a wind environment, suggesting a massive star progenitor.
Together with GRB 070125, this may indicate that a small but significant
portion of star formation in the early universe occurred far outside what we
consider a normal galactic disk. | Source: | arXiv, 0805.2394 | Services: | Forum | Review | PDF | Favorites |
|
|
No review found.
Did you like this article?
Note: answers to reviews or questions about the article must be posted in the forum section.
Authors are not allowed to review their own article. They can use the forum section.
browser claudebot
|
| |
|
|
|
| News, job offers and information for researchers and scientists:
| |