Bissaldi 2011 GBM亮暴的谱

主要内容:
从253个中选了52个（34长，18短），GBM甚至比BATSE都包含更多的短暴。确认了短暴比长暴更硬。

精彩摘抄:

居然有这样一个统计关系！估计没什么意义，就是时间越长，流量越大，意思就是观测到的基本上所有的暴都大致上每秒钟得到差不多的能量（这个是这样的吗？）。如果每个暴的流量密度都差不多这个说法是粗糙，但是统计关系还“不错“，说明其他看起来还不错的统计关系实际上也没什么意义。

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Title:		First-year Results of Broadband Spectroscopy of the Brightest Fermi-GBM Gamma-Ray Bursts
Authors:		Bissaldi, Elisabetta; von Kienlin, Andreas; Kouveliotou, Chryssa; Briggs, Michael S.; Connaughton, Valerie;Greiner, Jochen; Gruber, David; Lichti, Giselher; Bhat, P. N.; Burgess, J. Michael; Chaplin, Vandiver; Diehl, Roland;Fishman, Gerald J.; Fitzpatrick, Gerard; Foley, Suzanne; Gibby, Melissa; Giles, Misty; Goldstein, Adam;Guiriec, Sylvain; van der Horst, Alexander J.; Kippen, Marc; Lin, Lin; McBreen, Sheila; Meegan, Charles A.;Paciesas, William S.; Preece, Robert D.; Rau, Arne; Tierney, Dave; Wilson-Hodge, Colleen
Publication:		eprint arXiv:1101.3325
Publication Date:		01/2011
Origin:		ARXIV
Keywords:		Astrophysics - High Energy Astrophysical Phenomena
Comment:		40 pages, 11 figures, 3 tables, Submitted to ApJ
Bibliographic Code:		2011arXiv1101.3325B

Abstract

We present here our results of the temporal and spectral analysis of a sample of 52 bright and hard gamma-ray bursts (GRBs) observed with the Fermi Gamma-ray Burst Monitor (GBM) during its first year of operation (July 2008-July 2009). Our sample was selected from a total of 253 GBM GRBs based on each event peak count rate measured between 0.2 and 40MeV. The final sample comprised 34 long and 18 short GRBs. These numbers show that the GBM sample contains a much larger fraction of short GRBs, than the CGRO/BATSE data set, which we explain as the result of our (different) selection criteria and the improved GBM trigger algorithms, which favor collection of short, bright GRBs over BATSE. A first by-product of our selection methodology is the determination of a detection threshold from the GBM data alone, above which GRBs most likely will be detected in the MeV/GeV range with the Large Area Telescope (LAT) onboard Fermi. This predictor will be very useful for future multiwavelength GRB follow ups with ground and space based observatories. Further we have estimated the burst durations up to 10MeV and for the first time expanded the duration-energy relationship in the GRB light curves to high energies. We confirm that GRB durations decline with energy as a power law with index approximately -0.4, as was found earlier with the BATSE data and we also notice evidence of a possible cutoff or break at higher energies. Finally, we performed time-integrated spectral analysis of all 52 bursts and compared their spectral parameters with those obtained with the larger data sample of the BATSE data. We find that the two parameter data sets are similar and confirm that short GRBs are in general harder than longer ones.

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