Sökning: WFRF:(Jackson S) > (2005-2009) > FERMI OBSERVATIONS ...
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000 | 10929naa a2203001 4500 | |
001 | oai:DiVA.org:kth-12505 | |
003 | SwePub | |
008 | 100429s2009 | |||||||||||000 ||eng| | |
009 | oai:DiVA.org:su-33748 | |
009 | oai:DiVA.org:hik-2807 | |
024 | 7 | a https://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-125052 URI |
024 | 7 | a https://doi.org/10.1088/0004-637X/706/1/L1382 DOI |
024 | 7 | a https://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-337482 URI |
024 | 7 | a https://urn.kb.se/resolve?urn=urn:nbn:se:hik:diva-28072 URI |
040 | a (SwePub)kthd (SwePub)sud (SwePub)lnu | |
041 | a engb eng | |
042 | 9 SwePub | |
072 | 7 | a ref2 swepub-contenttype |
072 | 7 | a art2 swepub-publicationtype |
100 | 1 | a Abdo, A. A.4 aut |
245 | 1 0 | a FERMI OBSERVATIONS OF GRB 090902B :b A DISTINCT SPECTRAL COMPONENT IN THE PROMPT AND DELAYED EMISSION |
264 | 1 | c 2009 |
338 | a print2 rdacarrier | |
500 | a QC 20120221 | |
520 | a We report on the observation of the bright, long gamma-ray burst (GRB), GRB 090902B, by the Gamma-ray Burst Monitor (GBM) and Large Area Telescope (LAT) instruments on-board the Fermi observatory. This was one of the brightest GRBs to have been observed by the LAT, which detected several hundred photons during the prompt phase. With a redshift of z = 1.822, this burst is among the most luminous detected by Fermi. Time-resolved spectral analysis reveals a significant power-law component in the LAT data that is distinct from the usual Band model emission that is seen in the sub-MeV energy range. This power-law component appears to extrapolate from the GeV range to the lowest energies and is more intense than the Band component, both below similar to 50 keV and above 100 MeV. The Band component undergoes substantial spectral evolution over the entire course of the burst, while the photon index of the power-law component remains constant for most of the prompt phase, then hardens significantly toward the end. After the prompt phase, power-law emission persists in the LAT data as late as 1 ks post-trigger, with its flux declining as t(-1.5). The LAT detected a photon with the highest energy so far measured from a GRB, 33.4(-3.5)(+ 2.7) GeV. This event arrived 82 s after the GBM trigger and similar to 50 s after the prompt phase emission had ended in the GBM band. We discuss the implications of these results for models of GRB emission and for constraints on models of the extragalactic background light. | |
650 | 7 | a NATURVETENSKAPx Fysikx Astronomi, astrofysik och kosmologi0 (SwePub)103052 hsv//swe |
650 | 7 | a NATURAL SCIENCESx Physical Sciencesx Astronomy, Astrophysics and Cosmology0 (SwePub)103052 hsv//eng |
650 | 7 | a NATURVETENSKAPx Fysik0 (SwePub)1032 hsv//swe |
650 | 7 | a NATURAL SCIENCESx Physical Sciences0 (SwePub)1032 hsv//eng |
653 | a gamma rays: bursts | |
653 | a gamma-ray burst | |
653 | a high-energy | |
653 | a batse observations | |
653 | a redshift | |
653 | a behavior | |
653 | a photons | |
653 | a 080514b | |
653 | a mission | |
653 | a 080916c | |
653 | a escape | |
653 | a High energy astrophysics | |
653 | a Physics | |
700 | 1 | a Ackermann, M.4 aut |
700 | 1 | a Ajello, M.4 aut |
700 | 1 | a Asano, K.4 aut |
700 | 1 | a Atwood, W. B.4 aut |
700 | 1 | a Axelsson, M.u Stockholms universitet,Institutionen för astronomi4 aut0 (Swepub:su)aaxe |
700 | 1 | a Baldini, L.4 aut |
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700 | 1 | a Barbiellini, G.4 aut |
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710 | 2 | a Stockholms universitetb Institutionen för astronomi4 org |
773 | 0 | t Astrophysical Journal Lettersg 706:1, s. L138-L144q 706:1<L138-L144x 2041-8205x 0004-637Xx 1538-4357 |
856 | 4 8 | u https://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-12505 |
856 | 4 8 | u https://doi.org/10.1088/0004-637X/706/1/L138 |
856 | 4 8 | u https://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-33748 |
856 | 4 8 | u https://urn.kb.se/resolve?urn=urn:nbn:se:hik:diva-2807 |
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