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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 6.

Cygnus X-1 flux measured by MAXI and Swift-BAT during the COSI-Balloon 2016 flight. The COSI-Balloon flight period is marked by solid vertical lines, and the two NuSTAR observations considered for this analysis in the combined spectrum are marked by two vertical dashed lines. The low 2–4 keV count rate measured by MAXI and the high 15–50 keV count rate measured by Swift-BAT are strong indicators that Cyg X-1 was in the LHS during the COSI-Balloon observations.

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