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GRB 170817A Spectral Fitting Analysis

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Questions and Answers

What is the purpose of assuming a source position for the GRB in the context of mapping incident photon energies?

To determine the duration of GRBs accurately

To generate detector responses and map incident photon energies to observed count energies (correct)

To understand the tradeoff between low detector response and systematics

To study the spectrum of gamma-ray emissions

Why are NaI detectors used for standard analysis with observing angles less than 60 degrees?

Because they have a better response beyond 60 degrees

Because they are less affected by spacecraft blockage

Because the response is reduced beyond 60 degrees (correct)

Because they have the highest sensitivity to gamma rays

Why is the BGO detector with the smallest viewing angle to the source used in analysis?

Because it has a better response at larger viewing angles

Because it is least affected by spacecraft blockage

Due to its reduced dependence on viewing angle compared to NaI detectors (correct)

Due to its higher sensitivity

Why are detectors not used for analysis if portions of the spacecraft or LAT block them from viewing the source?

Due to obstruction affecting detector responses Signup and view all the answers

How is the duration of GRBs typically defined?

By reaching 5% and 95% of the cumulative observed fluence Signup and view all the answers

What is T90 in the context of defining GRB duration?

The time between reaching 5% and 95% of cumulative observed fluence Signup and view all the answers

What is the canonical observing energy range for durations defined by T90?

$50-300$ keV Signup and view all the answers

In terms of duration analysis, what aspect of GRBs is usually considered at 5% and 95% of cumulative observed fluence?

Spectrum Signup and view all the answers

What is the main parameter that defines the duration of a GRB?

T90 Signup and view all the answers

How does observing energy range relate to defining the duration of a GRB burst?

It influences how quickly a burst reaches peak intensity and fades out Signup and view all the answers