伽玛射线暴的能谱性质

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1、thecorrelationbetweenobservedflux∽andpeakenergy㈣)of1痧spectruminrisinganddecayingphasesofthesepulses．Twokindsof岛evolutiontrends，i⋯ehard-to—soft(two—thi池ofpulsesinoursample)and屏-tracing—F(one-thirdofpulsesinOursample)，areobservedinpulsesfromdifferentGRBsandevenfro

2、mdifferentpulsesofsameburst．Nodependenceofspectralevolutionfeatureonpulseshapeisfound．Atightp耳positivecorrelationisobservedindecayingphases，withapower-lawindex。2．2，whichismuchshallowerthanthatexpectedfromcurvatureeffect．Inrisingphase，theobservedFiseithercorrelat

3、edoranti—correlatedwim屏，dependingonspectralevolutionfeature，andpower-lawindexofcorrelationisdramaticallydifferentamongpulses．Morethan80％oflow—energyphotonindicesintime-resolvedspectra,whoseep’Sareanti—correlatedwithFduringrisingphase，violatedeathlineofsynchrotro

4、nradiation,disfavoringsynchrotronradiationmodelforthesegammarays．Thep昂correlation，especiallyforthoseGRBswithEp-tracking-Fspectralevolution，maybeduetoviewingangleandjetstructureeffects．Inthisscenario，theobservedp岛correlationinrisingphasemaybeduetolineofsighttowar

5、dastructuredjetmovingfromoff-beamtoon—beam(jitter)，andbothon—beamemissionanddecayedphotonsfromhighlatitudeofGRBfireballcontributetodecayingphase，resultinginashallowerslopeofIVobservedp岛correlationthanthatpredictedbythepurecurvatureeffect．Low—energyphotonsgeneral

6、lylagbehindthehighenergyphotonsinGRBs．WestudythespectrallagsinboththeGRBpulsesandlateX-rayflares．WeshowthatthelagsintheflaresaremuchlongerthanthatintheGRBpulses，andthelongerdurationofapulse／flaretendstohavelongerspectrallag．Normalizedthelagtothedurationofthecorr

7、espondingpulse／flare，wefindthatthenormalizedlagsintheflaresandpulsesroughlyfollowthesamerelation，likelyindicatingthatphysicaloriginofthelaginboththepulsesandflaresaresimilar．KEYWORDS：Gamma-RayBursts，Spectrum，blackbodyV1．1伽玛暴的观测⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯．21．1．

8、1观测仪器⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯．21．1．2观测特征⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯61．2伽玛暴的分类⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯171．2．1长暴和短暴⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯．171．2．2TypeI型和Typ