- LandOfFree
- Scientists
- Astronomy and Astrophysics
- Astrophysics
Details
The Average Temporal and Spectral Evolution of Gamma-Ray Bursts
The Average Temporal and Spectral Evolution of Gamma-Ray Bursts
1997-12-26
-
arxiv.org/abs/astro-ph/9712331v1
Astronomy and Astrophysics
Astrophysics
10 pages, 3 figures, Tex, submitted to ApJ
Scientific paper
We have averaged bright BATSE bursts to uncover the average overall temporal and spectral evolution of gamma-ray bursts (GRBs). We align the temporal structure of each burst by setting its duration to a standard duration, which we call T_. The observed average ``aligned $T_'' profile for 32 bright bursts with intermediate durations (16 to 40 s) has a sharp rise (within the first 20% of T_) and then a linear decay. Exponentials and power laws do not fit this decay. In particular, the power law seen in the x-ray afterglow (T^{-1.4}) is not observed during the bursts, implying that the x-ray afterglow is not just an extension of the x-ray evolution seen during the gamma-ray phase. The average burst spectrum has a low energy slope of -1.03, a high energy slope of -3.31, and a peak in the \nu F_{\nu} distribution at 390 keV. We determine the average spectral evolution. Remarkably, it is also a linear function, with the peak of the \nu F_{\nu} distribution given by 680 - 600 (T/T_) keV. Since both the temporal profile and the peak energy are linear functions, the peak energy is linearly proportional to the intensity. This behavior is inconsistent with the external shock model. Previously, trends have been reported for GRB evolution, but our results are quantitative relationships that models should attempt to explain.
Affiliated with
Also associated with
No associations
LandOfFree
Say what you really think
Search LandOfFree.com for scientists and scientific papers. Rate them and share your experience with other people.
Rating
The Average Temporal and Spectral Evolution of Gamma-Ray Bursts does not yet have a rating.
At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with The Average Temporal and Spectral Evolution of Gamma-Ray Bursts, we encourage you to share that experience with our LandOfFree.com community.
Your opinion is very important and The Average Temporal and Spectral Evolution of Gamma-Ray Bursts will most certainly appreciate the feedback.
Rate now
Profile ID: LFWR-SCP-O-311053
All data on this website is collected from public sources.
Our data reflects the most accurate information available at the time of publication.