Uncovering low-level Fermi/GBM emission using orbital background subtraction

Dave Tierney; Gerard Fitzpatrick; Sheila McBreen; Valerie Connaughton

Uncovering low-level Fermi/GBM emission using orbital background subtraction

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arxiv 1111.3779 v1 pith:M3IZSTDB submitted 2011-11-16 astro-ph.HE astro-ph.IM

Uncovering low-level Fermi/GBM emission using orbital background subtraction

Gerard Fitzpatrick , Valerie Connaughton , Sheila McBreen , Dave Tierney This is my paper

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The secondary instrument onboard Fermi, the Gamma-ray Burst Monitor (GBM) is an all sky monitor consisting of 14 scintillation detectors. When analysing transient events such as Gamma-Ray Bursts (GRBs) and Solar Flares (SFs) the background is usually modelled as a polynomial (order 0-4). However, for long events the background may vary more than can be accounted for with a simple polynomial. In these cases a more accurate knowledge of GBM's background rates is required. Here we present an alternative method of both determining the background and distinguishing low-level emission from the instrumental background.

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