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Detection of a spectral break in the extra hard component of GRB 090926A

dc.contributor.authorAckermann, M.
dc.contributor.authorAjello, M.
dc.contributor.authorAsano, K.
dc.contributor.authorAxelsson, M.
dc.contributor.authorBaldini, L.
dc.contributor.authorBallet, J.
dc.contributor.authorBarbiellini, G.
dc.contributor.authorBaring, M.G.
dc.contributor.authorBastieri, D.
dc.contributor.authorBechtol, K.
dc.contributor.authorBellazzini, R.
dc.contributor.authorBerenji, B.
dc.contributor.authorBhat, P.N.
dc.contributor.authorBissaldi, E.
dc.contributor.authorBlandford, R.
dc.contributor.authorBonamente, E.
dc.contributor.authorBorgland, A.W.
dc.contributor.authorBouvier, A.
dc.contributor.authorBregeon, J.
dc.contributor.authorBrez, A.
dc.contributor.authorBriggs, M.S.
dc.contributor.authorBrigida, M.
dc.contributor.authorBruel, P.
dc.contributor.authorBuehler, R.
dc.contributor.authorBuson, S.
dc.contributor.authorCaliandro, G.A.
dc.contributor.authorCameron, R.A.
dc.contributor.authorCaraveo, P.A.
dc.contributor.authorCarrigan, S.
dc.contributor.authorCasandjian, J.M.
dc.contributor.authorCecchi, C.
dc.contributor.authorCelik, O.
dc.contributor.authorChaplin, V.
dc.contributor.authorCharles, E.
dc.contributor.authorChekhtman, A.
dc.contributor.authorChiang, J.
dc.contributor.authorCiprini, S.
dc.contributor.authorClaus, R.
dc.contributor.authorCohen-Tanugi, J.
dc.contributor.authorConnaughton, V.
dc.contributor.authorConrad, J.
dc.contributor.authorCutini, S.
dc.contributor.authorDermer, C.
dc.contributor.authorde Angelis, A.
dc.contributor.authorde Palma, F.
dc.contributor.authorDingus, B.
dc.contributor.authordo Couto e Silva, E.
dc.contributor.authorDrell, P.S.
dc.contributor.authorDubois, R.
dc.contributor.authorFavuzzi, C.
dc.contributor.authorFegan, S.
dc.contributor.authorFerrara, E.C.
dc.contributor.authorFocke, W.B.
dc.contributor.authorFrailis, M.
dc.contributor.authorFukazawa, Y.
dc.contributor.authorFunk, S.
dc.contributor.authorFusco, P.
dc.contributor.authorGargano, F.
dc.contributor.authorGasparrini, D.
dc.contributor.authorGehrels, N.
dc.contributor.authorGiglietto, N.
dc.contributor.authorGiordano, N.
dc.contributor.authorVilchez, N.
dc.date.accessioned2011-04-07T14:29:13Z
dc.date.available2011-04-07T14:29:13Z
dc.date.issued2011
dc.identifier.citationAckermann , M , Ajello , M , Asano , K , Axelsson , M , Baldini , L , Ballet , J , Barbiellini , G , Baring , M G , Bastieri , D , Bechtol , K , Bellazzini , R , Berenji , B , Bhat , P N , Bissaldi , E , Blandford , R , Bonamente , E , Borgland , A W , Bouvier , A , Bregeon , J , Brez , A , Briggs , M S , Brigida , M , Bruel , P , Buehler , R , Buson , S , Caliandro , G A , Cameron , R A , Caraveo , P A , Carrigan , S , Casandjian , J M , Cecchi , C , Celik , O , Chaplin , V , Charles , E , Chekhtman , A , Chiang , J , Ciprini , S , Claus , R , Cohen-Tanugi , J , Connaughton , V , Conrad , J , Cutini , S , Dermer , C , de Angelis , A , de Palma , F , Dingus , B , do Couto e Silva , E , Drell , P S , Dubois , R , Favuzzi , C , Fegan , S , Ferrara , E C , Focke , W B , Frailis , M , Fukazawa , Y , Funk , S , Fusco , P , Gargano , F , Gasparrini , D , Gehrels , N , Giglietto , N , Giordano , N & Vilchez , N 2011 , ' Detection of a spectral break in the extra hard component of GRB 090926A ' , The Astrophysical Journal , vol. 729 , no. 2 . https://doi.org/10.1088/0004-637X/729/2/114
dc.identifier.issn0004-637X
dc.identifier.otherdspace: 2299/5589
dc.identifier.urihttp://hdl.handle.net/2299/5589
dc.description‘In these times, during the rise in the popularity of institutional repositories, the Society does not forbid authors from depositing their work in such repositories. However, the AAS regards the deposit of scholarly work in such repositories to be a decision of the individual scholar, as long as the individual's actions respect the diligence of the journals and their reviewers.’ Original article can be found at: http://iopscience.iop.org/ Copyright American Astronomical Society
dc.description.abstractWe report on the observation of the bright, long gamma-ray burst,GRB 090926A, by the Gamma-ray Burst Monitor (GBM) and Large Area Tele-scope (LAT) instruments on board the Fermi Gamma-ray Space Telescope. GRB 090926A shares several features with other bright LAT bursts. In particular, it clearly shows a short spike in the light curve that is present in all detectors that see the burst, and this in turn suggests that there is a common region of emission across the entire Fermi energy range. In addition, while a separate high-energy power-law component has already been observed in other GRBs, here we report for the first time the detection with good significance of a high-energy spectral break (or cutoff) in this power-law component around 1.4 GeV in the time-integrated spectrum. If the spectral break is caused by opacity to electron-positron pair production within the source, then this observation allows us to compute the bulk Lorentz factor for the outflow, rather than a lower limit.en
dc.format.extent571883
dc.language.isoeng
dc.relation.ispartofThe Astrophysical Journal
dc.subjectgamma rays: bursts
dc.titleDetection of a spectral break in the extra hard component of GRB 090926Aen
dc.contributor.institutionSchool of Physics, Astronomy and Mathematics
dc.description.statusPeer reviewed
rioxxterms.versionofrecord10.1088/0004-637X/729/2/114
rioxxterms.typeJournal Article/Review
herts.preservation.rarelyaccessedtrue


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