2011ApJ...729..114A

Query : 2011ApJ...729..114A

2011ApJ...729..114A - Astrophys. J., 729, 114 (2011/March-2)

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

ACKERMANN 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.D., 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.D., DE ANGELIS A., DE PALMA F., DINGUS B.L., DO COUTO E SILVA E., DRELL P.S., DUBOIS R., FAVUZZI C., FEGAN S.J., FERRARA E.C., FOCKE W.B., FRAILIS M., FUKAZAWA Y., FUNK S., FUSCO P., GARGANO F., GASPARRINI D., GEHRELS N., GERMANI S., GIGLIETTO N., GIORDANO F., GIROLETTI M., GLANZMAN T., GODFREY G., GOLDSTEIN A., GRANOT J., GREINER J., GRENIER I.A., GROVE J.E., GUIRIEC S., HADASCH D., HANABATA Y., HARDING A.K., HAYASHI K., HAYASHIDA M., HAYS E., HORAN D., HUGHES R.E., ITOH R., JOHANNESSON G., JOHNSON A.S., JOHNSON W.N., KAMAE T., KATAGIRI H., KATAOKA J., KIPPEN R.M., KNODLSEDER J., KOCEVSKI D., KOUVELIOTOU C., KUSS M., LANDE J., LATRONICO L., LEE S.-H., LLENA GARDE M., LONGO F., LOPARCO F., LOVELLETTE M.N., LUBRANO P., MAKEEV A., MAZZIOTTA M.N., McBREEN S., McENERY J.E., McGLYNN S., MEEGAN C., MEHAULT J., MESZAROS P., MICHELSON P.F., MIZUNO T., MONTE C., MONZANI M.E., MORETTI E., MORSELLI A., MOSKALENKO I.V., MURGIA S., NAKAJIMA H., NAKAMORI T., NAUMANN-GODO M., NISHINO S., NOLAN P.L., NORRIS J.P., NUSS E., OHNO M., OHSUGI T., OKUMURA A., OMODEI N., ORLANDO E., ORMES J.F., OZAKI M., PACIESAS W.S., PANEQUE D., PANETTA J.H., PARENT D., PELASSA V., PEPE M., PESCE-ROLLINS M., PETROSIAN V., PIRON F., PORTER T.A., PREECE R., RACUSIN J.L., RAINO S., RANDO R., RAU A., RAZZANO M., RAZZAQUE S., REIMER A., REIMER O., REPOSEUR T., REYES L.C., RIPKEN J., RITZ S., ROTH M., RYDE F., SADROZINSKI H.F.-W., SANDER A., SCARGLE J.D., SCHALK T.L., SGRO C., SISKIND E.J., SMITH P.D., SPANDRE G., SPINELLI P., STAMATIKOS M., STECKER F.W., STRICKMAN M.S., SUSON D.J., TAJIMA H., TAKAHASHI H., TANAKA T., TANAKA Y., THAYER J.B., THAYER J.G., TIBALDO L., TIERNEY D., TOMA K., TORRES D.F., TOSTI G., TRAMACERE A., UCHIYAMA Y., UEHARA T., USHER T.L., VANDENBROUCKE J., VAN DER HORST A.J., VASILEIOU V., VILCHEZ N., VITALE V., VON KIENLIN A., WAITE A.P., WANG P., WILSON-HODGE C., WINER B.L., WOOD K.S., WU X.F., YAMAZAKI R., YANG Z., YLINEN T. and ZIEGLER M.

Abstract (from CDS):

We report on the observation of the bright, long gamma-ray burst, GRB 090926A, by the Gamma-ray Burst Monitor and Large Area Telescope (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 gamma-ray bursts, 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.

Abstract Copyright: ∼

Journal keyword(s): gamma-ray burst: individual: GRB 090926A

Simbad objects: 7

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Number of rows : 7
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2026 		#notes
1 GRB 080916C gB 07 59 23.24 -56 38 16.8           ~ 386 0
2 Fermi bn090217206 gB 13 40 -08.4           ~ 56 0
3 GRB 080825C gB 15 28.8 -04 54           ~ 71 0
4 Fermi bn090902462 gB 17 39 45.26 +27 19 28.1           ~ 440 0
5 Fermi bn081024891 gB 21 31 36.00 +21 12 14.4           ~ 91 0
6 Fermi bn090510016 G 22 14 12.6230 -26 34 58.550           ~ 548 0
7 Fermi bn090926181 gB 23 33 36.18 -66 19 25.9           ~ 339 0

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