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Imaging and Spectral Fitting of Bright Gamma-Ray Sources with the COSI Balloon Payload

  • Authors: Jarred M. Roberts, Steven Boggs, Thomas Siegert, John A. Tomsick, Marco Ajello, Peter von Ballmoos, Jacqueline Beechert, Floriane Cangemi, Savitri Gallego, Pierre Jean, Chris Karwin, Carolyn Kierans, Hadar Lazar, Alex Lowell, Israel Martinez Castellanos, Sean Pike, Clio Sleator, Yong Sheng, Hiroki Yoneda, Andreas Zoglauer

Jarred M. Roberts et al 2025 The Astrophysical Journal 979 .

  • Provider: AAS Journals

Caption: Figure 4.

Left: Crab image generated from the 2016 COSI-Balloon flight data. The pixels are separated into 6◦ bins, and the cyan circle drawn at the known source location with an ARM radius of 8° is shown to represent the instrument angular resolution for the energy bin 325–480 keV. Right: Crab spectrum as measured by NuSTAR (black, red), Swift/BAT (green), and the COSI-Balloon instrument (blue), fit with a broken power law. The fit has a reduced-χ2 value of 1.08 (see Table 2).

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