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2014ApJ...781L..11A - Astrophys. J., 781, L11 (2014/January-3)

A search for enhanced very high energy gamma-ray emission from the 2013 March Crab nebula flare.

ALIU E., ARCHAMBAULT S., AUNE T., BENBOW W., BERGER K., BIRD R., BOUVIER A., BUCKLEY J.H., BUGAEV V., BYRUM K., CERRUTI M., CHEN X., CIUPIK L., CONNOLLY M.P., CUI W., DUMM J., ERRANDO M., FALCONE A., FEDERICI S., FENG Q., FINLEY J.P., FORTIN P., FORTSON L., FURNISS A., GALANTE N., GILLANDERS G.H., GRIFFIN S., GRIFFITHS S.T., GRUBE J., GYUK G., HANNA D., HOLDER J., HUGHES G., HUMENSKY T.B., KAARET P., KERTZMAN M., KHASSEN Y., KIEDA D., KRENNRICH F., KUMAR S., LANG M.J., LYUTIKOV M., MAIER G., McARTHUR S., McCANN A., MEAGHER K., MILLIS J., MORIARTY P., MUKHERJEE R., DE BHROITHE A.O., ONG R.A., OTTE A.N., PARK N., PERKINS J.S., POHL M., POPKOW A., QUINN J., RAGAN K., RAJOTTE J., REYES L.C., REYNOLDS P.T., RICHARDS G.T., ROACHE E., SEMBROSKI G.H., SHEIDAEI F., SMITH A.W., STASZAK D., TELEZHINSKY I., THEILING M., TUCCI J.V., TYLER J., VARLOTTA A., WAKELY S.P., WEEKES T.C., WEINSTEIN A., WELSING R., WILLIAMS D.A., ZAJCZYK A. and ZITZER B.

Abstract (from CDS):

In 2013 March, a flaring episode from the Crab Nebula lasting ∼2 weeks was detected by Fermi-LAT (Large Area Telescope on board the Fermi Gamma-ray Space Telescope). The Very Energetic Radiation Imaging Telescope Array System (VERITAS) provides simultaneous observations throughout this period. During the flare, Fermi-LAT detected a 20 fold increase in flux above the average synchrotron flux >100 MeV seen from the Crab Nebula. Simultaneous measurements with VERITAS are consistent with the non-variable long-term average Crab Nebula flux at TeV energies. Assuming a linear correlation between the very high energy flux change >1 TeV and the flux change seen in the Fermi-LAT band >100 MeV during the period of simultaneous observations, the linear correlation factor can be constrained to be at most 8.6x10–3 with 95% confidence.

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Journal keyword(s): gamma rays: general - ISM: individual: Crab Nebula

Simbad objects: 2

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