First-year results of broadband spectroscopy of the brightest Fermi-GBM gamma-ray bursts
| العنوان: | First-year results of broadband spectroscopy of the brightest Fermi-GBM gamma-ray bursts |
|---|---|
| المؤلفون: | Lin Lin, Roland Diehl, William S. Paciesas, Sheila McBreen, R. Marc Kippen, Suzanne Foley, Michael Burgess, Arne Rau, Chryssa Kouveliotou, Elisabetta Bissaldi, Gerald J. Fishman, Valerie Connaughton, Dave Tierney, Misty Giles, Jochen Greiner, Robert D. Preece, Adam Goldstein, Sylvain Guiriec, David Gruber, Charles A. Meegan, Gerard Fitzpatrick, Andreas von Kienlin, Alexander J. van der Horst, Vandiver Chaplin, Colleen A. Wilson-Hodge, P. N. Bhat, Michael S. Briggs, G. G. Lichti, Melissa Gibby |
| المساهمون: | Bissaldi, Elisabetta, A. v., Kienlin, C., Kouveliotou, M. S., Brigg, V., Connaughton, J., Greiner, D., Gruber, G., Lichti, P. N., Bhat, M., Burge, V., Chaplin, R., Diehl, G. J., Fishman, G., Fitzpatrick, S., Foley, M. H., Gibby, M. M., Gile, A., Goldstein, S., Guiriec, A. J., Van, R. M., Kippen, L., Lin, S., Mcbreen, C. A., Meegan, W. S., Paciesa, R. D., Preece, A., Rau, D., Tierney, C., Wilson Hodge |
| سنة النشر: | 2011 |
| مصطلحات موضوعية: | Astrophysics::High Energy Astrophysical Phenomena, FOS: Physical sciences, Astrophysics, general [gamma-ray burst], 01 natural sciences, Power law, Gamma-ray burst: general, methods: data analysis, law.invention, Telescope, law, 0103 physical sciences, data analysis [methods], Range (statistics), Cutoff, Spectroscopy, 010303 astronomy & astrophysics, High Energy Astrophysical Phenomena (astro-ph.HE), Physics, 010308 nuclear & particles physics, Astronomy and Astrophysics, Light curve, 3. Good health, Space and Planetary Science, Astrophysics - High Energy Astrophysical Phenomena, Gamma-ray burst, Fermi Gamma-ray Space Telescope |
| الوصف: | 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. 40 pages, 11 figures, 3 tables, Submitted to ApJ |
| اللغة: | English |
| الوصول الحر: | https://explore.openaire.eu/search/publication?articleId=doi_dedup___::6b3c39a4cc57052e4e7bee8a8f53475bTest http://hdl.handle.net/11589/205170Test |
| حقوق: | OPEN |
| رقم الانضمام: | edsair.doi.dedup.....6b3c39a4cc57052e4e7bee8a8f53475b |
| قاعدة البيانات: | OpenAIRE |
| الوصف غير متاح. |