Bayesian Time-resolved Spectroscopy of Multipulse GRBs: Variations of Emission Properties among Pulses
نویسندگان
چکیده
Gamma-ray bursts (GRBs) are highly variable and exhibit strong spectral evolution. In particular, the emission properties vary from pulse to in multipulse bursts. Here we present a time-resolved Bayesian analysis of compilation GRB pulses observed by {\it Fermi}/Gamma-ray Burst Monitor. The selected have at least four timebins with high statistical significance, which ensures that fits well determined correlations can be established. sample consists 39 bursts, 117 pulses, 1228 spectra. We confirm general trend become softer over time, mainly low-energy power-law index $\alpha$ becoming smaller. A few exceptions this exist, hardest occurring late times. first burst is clearly different later pulses; three-fourths them violate synchrotron line death, while around half significantly prefer photospheric emission. These fractions decrease for subsequent pulses. also find two-thirds parameters ($\alpha$ peak energy) track light-curve variations. This larger fraction compared what found previous samples. conclusion, compatible photosphere typically close trigger chance detecting greatest allows coexistence mechanisms
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ژورنال
عنوان ژورنال: Astrophysical Journal Supplement Series
سال: 2021
ISSN: ['1538-4365', '0067-0049']
DOI: https://doi.org/10.3847/1538-4365/abee2a