Aug 14th, 2007| 12:47 pm | Posted by hlee
From arxiv/astro-ph:0708.1510v1
Connecting GRBs and galaxies: the probability of chance coincidence by Cobb and Bailyn
Without an optical afterglow, a galaxy within the 2 arc second error region of a GRB x-ray afterglow is identified as a host galaxy; however confusion can rise due to the facts that 1. the edge of a galaxy is diffused, 2. multiple sources could exist within 2 arc second error region, 3.the distance between the galaxy and the x-ray afterglow is measured by projection, and 4. lensing causes increase of brightness and position shifts. In this paper, the authors “investigated the fields of 72 GRBs in order to examine the general issue of associations between GRBs and host galaxies.”
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Tags:
afterglow,
false discovery,
GRB,
host galaxy,
lensing,
source matching Category:
arXiv,
Data Processing,
Galaxies,
gamma-ray,
Objects,
Uncertainty |
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Jul 16th, 2007| 12:15 pm | Posted by hlee
From arxiv/astro-ph:0707.1900v1
The complete catalogue of gamma-ray bursts observed by the Wide Field Cameras on board BeppoSAX by Vetere, et.al.
This paper intend to publicize the largest data set of Gamma Ray Burst (GRB) X-ray afterglows (right curves after the event), which is available from http://www.asdc.asi.it. It is claimed to be a complete on-line catalog of GRB observed by two wide-Field Cameras on board BeppoSAX (Click for its Wiki) in the period of 1996-2002. It is comprised with 77 bursts and 56 GRBs with Xray light curves, covering the energy range 40-700keV. A brief introduction to the instrument, data reduction, and catalog description is given.
Tags:
afterglow,
BeppoSAX,
catalog,
GRB,
light curve Category:
arXiv,
Data Processing,
gamma-ray,
Objects,
Spectral,
Timing,
X-ray |
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