标题： 长伽马射线暴的伽马光度学红移 显示英文标题

标题： Gamma photometric redshifts for long gamma-ray bursts

摘要： 已知伽马射线暴谱的软尾显示出与纯幂律依赖关系的偏差。本文显示这种偏差可以在不同BATSE DISCSC能量信道的峰值流量比中被检测到。这一效应允许估算BATSE目录中明亮长伽马射线暴的红移。对于同时拥有BATSE DISCSC数据和测量光学光谱红移的8个伽马射线暴（GRB），验证了这些红移。测量值与估算值之间有很好的相关性，平均误差为$\Delta z \approx 0.33$。该方法类似于光学范围内星系的测光红移估算，因此可以称之为“伽马测光红移估算”。对明亮长伽马射线暴估算的红移可达$z \simeq 4$。对于较暗弱的长伽马射线暴（应达$z \simeq 20$），用这种方法不能明确确定红移。 显示英文摘要

摘要： It is known that the soft tail of the gamma-ray bursts' spectra show excesses from the exact power-law dependence. In this article we show that this departure can be detected in the peak flux ratios of different BATSE DISCSC energy channels. This effect allows to estimate the redshift of the bright long gamma-ray bursts in the BATSE Catalog. A verification of these redshifts is obtained for the 8 GRB which have both BATSE DISCSC data and measured optical spectroscopic redshifts. There is good correlation between the measured and esti redshifts, and the average error is $\Delta z \approx 0.33$. The method is similar to the photometric redshift estimation of galaxies in the optical range, hence it can be called as "gamma photometric redshift estimation". The estimated redshifts for the long bright gamma-ray bursts are up to $z \simeq 4$. For the the faint long bursts - which should be up to $z \simeq 20$ - the redshifts cannot be determined unambiguously with this method.