伽玛暴(Gamma-Ray Burst)笔记。记录有关伽玛暴的新文章,另外也包括看的老文章、自己的想法、以及跟天文相关的一些东西。 Feel free to leave me a message by comments or by email.

星期四, 十二月 11, 2008

Augusto 2008 地面望远镜好像看到了伽玛暴的GeV辐射

主要内容:
两个GBM的事例, 每个看到了3,4个events. 但是在别的时间也是有events的, 有些是背景.

精彩摘抄:


文章信息:

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· arXiv e-print (arXiv:0812.1935)
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Title:
Is there a GeV counterpart in the Fermi GBM events?
Authors:
Augusto, C. R. A.; Navia, C. E.; Tsui, K. H.; Shigueoka, H.
Publication:
eprint arXiv:0812.1935
Publication Date:
12/2008
Origin:
ARXIV
Keywords:
Astrophysics
Comment:
6 pages, 5 figures
Bibliographic Code:
2008arXiv0812.1935A

Abstract

In this paper we report a possible GeV counterpart observed at ground level as muons (or "photo-muons") of two Fermi gamma burst monitor (GBM) events, trigger bn081120618 and trigger bn081124060. In both cases, the trigger coordinates are within the field of view of the vertical Tupi telescope located at sea level and inside the South Atlantic Anomaly (SAA) region. We show that despite the first trigger being classified as GRB (due to a gamma ray burst), with an 100% probability assigned by GBM Flight Software, the trigger time 14:49:31 UT happened during particle precipitations in the SAA, which in most cases is $\sim 12h$ UT to $\sim 22h$ UT, and the probability of the trigger being attributed to particle precipitation, according to our analysis is 25%. The second Fermi trigger is also classified as GRB, with a 100% probability assigned by GBM Flight Software. The trigger time is 01:26:07 UT, which is outside the schedule of precipitation of particles. Another important observed characteristic is the existence of a ground level enhancement (GLE) with a sharp peak ($5.1\sigma$) coinciding with the Fermi trigger within the 10-second counting interval (raw data) of the vertical Tupi telescope. In addition it is possible to identify other GLEs before and after the trigger occurrence. In both cases, the scenario is similar to the long-duration GeV GRBs observed by EGRET within the BATSE field of view.
Bibtex entry for this abstract Preferred format for this abstract (see Preferences)

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