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Good news from BATSE-TASC data to MILAGRO

Good news from BATSE-TASC data to MILAGRO. Searching for a GRB second spectral component. magda. Detectors BATSE-LAD EGRET-TASC. no position determination E: 1-200 MeV 1,2,4,16,32 s t resolution 66% dead time. biggest GRB catalog position determination E: 25keV-2MeV

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Good news from BATSE-TASC data to MILAGRO

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  1. Good news from BATSE-TASC data to MILAGRO Searching for a GRB second spectral component magda

  2. DetectorsBATSE-LAD EGRET-TASC • no position determination • E: 1-200 MeV • 1,2,4,16,32 s t resolution • 66% dead time • biggest GRB catalog • position determination • E: 25keV-2MeV • 16-64ms t resolution magda

  3. Epeak and b are better determined Flux (photons keV cm-2 s-1) GRB910503 Energy (keV) magda

  4. GRB941017 Time after BATSE’s trigger(sec) magda

  5. GRB941017 • There is a second spectral component • observed by 2 different detectors • duration > 150sec • gamma = -1 • no peak seen • no temporal evolution • fluence = 4* fluenceBATSE magda

  6. GRB940217, Hurley 94, SSC 85, Harris 1998 GRB940417, Atkins 2000, SSC GRB941017, Gonzalez 03 magda

  7. Synchrotron Ne(ge) ge ge Es FIC SSC Fs Synchrotron ge Es EIC Understanding… magda

  8. INVERSE COMPTON SCATTERING E’IC = E’/(1+(E’/mc2)(1-cos f) Doppler shift EIC = ge2 ES E= E’ge(1 - bcos F’) = (103)2 105 eV E’=Ege(1 + bcos F) = 100 GeV -up Gamma = -1  in nFn Gamma’ = -1+2=1 For SSC LIC/LS = EIC/ES = 106!!!!! For IC temporal synchrotron part evolution  IC part will have same temporal evolution !!! magda

  9. HADRON CASCADES p po p 2g p g p p+ e +ne nmnm Sources of photons: p synchrotron po decay e+ synchrotron magda

  10. A second spectral component exists. There is not good enough theory that could explain it. It may or may not extend to MILAGRO energies It seems to last hundreds of seconds MILAGRO may see it if we search at lower energies in long time scales Need to improve our hadron rejection for lower energies. magda

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