- Conference date: 8−10 Jun 1989
- Location: Newark, Delaware (USA)
We show how the spectral analysis code ROBFIT has been used in analyzing gamma‐rays output from Supernova 1987A. The observations were performed using the GRAD detector which was on‐board a balloon launched from McMurdo Station, Antarctica on January 8 1986. A spectral analysis code, ROBFIT, capable of distinguishing peak at the noise level used to analyze the data. ROBFIT is a general purpose spectral analysis package which as been developed at the University of Florida.
ROBFIT represents gamma‐ray peak shapes and background continuum as combinations of spline functions. The background is fitted over the entire spectrum using a robust fitting technique. This removes the need to independently fit small regions of a spectrum which can lead to mis‐representation of the background under certain conditions. The code has the ability to model any peak shape as a combination of spline functions. Both background and peaks are adjusted simultaneously until χ2 is minimized. Then the background can be modified and new peaks searched for a new minimum found. This iterative procedure is carried out until a user supplied limit is reached. ROBFIT then outputs peak positions, widths strengths and their associated errors.
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