Imperial College London
Alternate

ProfessorDanielMortlock

Faculty of Natural Sciences, Department of Physics

Professor of Astrophysics and Statistics
 
 
 
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Contact

 

+44 (0)20 7594 7878d.mortlock Website

 
 
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Location

 

1018ABlackett LaboratorySouth Kensington Campus

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Summary

 

Publications

Citation

BibTex format

@article{Burgess:2018:mnras/stx2853,
author = {Burgess, JM and Yu, HF and Greiner, J and Mortlock, DJ},
doi = {mnras/stx2853},
journal = {Monthly Notices of the Royal Astronomical Society},
pages = {1427--1444},
title = {Awakening the BALROG: bayesian location reconstruction of GRBs},
url = {http://dx.doi.org/10.1093/mnras/stx2853},
volume = {476},
year = {2018}
}
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RIS format (EndNote, RefMan)

TY  - JOUR
AB  - The accurate spatial location of gamma-ray bursts (GRBs) is crucial for both accurately characterizing their spectra and follow-up observations by other instruments. The Fermi Gamma-ray Burst Monitor (GBM) has the largest field of view for detecting GRBs as it views the entire unocculted sky, but as a non-imaging instrument it relies on the relative count rates observed in each of its 14 detectors to localize transients. Improving its ability to accurately locate GRBs and other transients is vital to the paradigm of multimessenger astronomy, including the electromagnetic follow-up of gravitational wave signals. Here we present the BAyesian Location Reconstruction Of GRBs (balrog) method for localizing and characterizing GBM transients. Our approach eliminates the systematics of previous approaches by simultaneously fitting for the location and spectrum of a source. It also correctly incorporates the uncertainties in the location of a transient into the spectral parameters and produces reliable positional uncertainties for both well-localized sources and those for which the GBM data cannot effectively constrain the position. While computationally expensive, balrog can be implemented to enable quick follow-up of all GBM transient signals. Also, we identify possible response problems that require attention and caution when using standard, public GBM detector response matrices. Finally, we examine the effects of including the uncertainty in location on the spectral parameters of GRB 080916C. We find that spectral parameters change and no extra components are required when these effects are included in contrast to when we use a fixed location. This finding has the potential to alter both the GRB spectral catalogues and the reported spectral composition of some well-known GRBs.
AU  - Burgess,JM
AU  - Yu,HF
AU  - Greiner,J
AU  - Mortlock,DJ
DO  - mnras/stx2853
EP  - 1444
PY  - 2018///
SN  - 0035-8711
SP  - 1427
TI  - Awakening the BALROG: bayesian location reconstruction of GRBs
T2  - Monthly Notices of the Royal Astronomical Society
UR  - http://dx.doi.org/10.1093/mnras/stx2853
UR  - http://hdl.handle.net/10044/1/52841
VL  - 476
ER  -
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