GRB spectral-energy correlations:perspectives and issues
The spectral-energy correlations (Epeak-Eiso and Epeak-Liso) holding for the population of long GRBs havebeen recently discussed．The question is if they have a physical origin or they are due to instrumantal selection efiects．Byconsidering GRBs with and without redshifts it is possible to study the instrumental selection effects in the observer frameEobs peak-Fluence and Eobs peak-Peak Flus plane,where strong correlations are found．The results suggests that while beth the triggerthreshold and the spectral analysis thresholds do not bias the sample of GRBs used to define the Epeak-Eiso and Epeak-Lisocorrelations in the pre-Swift era,a strong bias iS present in the Swift sample．If selection effects are difficult to model,aconclusive proof of the physical origin of the spectra-energy correlations comes from the time resolved spectral analysis．Byconsidering BATSE GRBs with known redshifts,it is shown that a correlation similar to the Epeak-Liso one(defined with thetime integrated spectral propeaies)also holds within single bursts．This result concludes the discussion about selection effectsand opens the path to the physical interpretations of these correlations．Finally we show the updated Epeak-Er correlation．
Gamma Ray Bursts Prompt Emission
G.Ghirlanda
INAF-Osservatorio Astronomico di Brera,Via E.Bianchi 46,I-23807 Merate(LC),Italy
国际会议
2008 NanJing Gamma-Ray Burst Conference(2008年伽马暴国际研讨会)
南京
英文
361-366
2008-06-23（万方平台首次上网日期，不代表论文的发表时间）