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GRB 221009A: Discovery of an Exceptionally Rare Nearby and Energetic Gamma-Ray Burst

Authors: Maia A. Williams, Jamie A. Kennea, S. Dichiara, Kohei Kobayashi, Wataru B. Iwakiri, Andrew P. Beardmore, P. A. Evans, Sebastian Heinz, Amy Lien, S. R. Oates, Hitoshi Negoro, S. Bradley Cenko, Douglas J. K. Buisson, Dieter H. Hartmann, Gaurava K. Jaisawal, N. P. M. Kuin, Stephen Lesage, Kim L. Page, Tyler Parsotan, Dheeraj R. Pasham, B. Sbarufatti, Michael H. Siegel, Satoshi Sugita, George Younes, Elena Ambrosi, Zaven Arzoumanian, M. G. Bernardini, S. Campana, Milvia Capalbi, Regina Caputo, Antonino D'Aì, P. D'Avanzo, V. D'Elia, Massimiliano De Pasquale, R. A. J. Eyles-Ferris, Elizabeth Ferrara, Keith C. Gendreau, Jeffrey D. Gropp, Nobuyuki Kawai, Noel Klingler, Sibasish Laha, A. Melandri, Tatehiro Mihara, Michael Moss, Paul O'Brien, Julian P. Osborne, David M. Palmer, Matteo Perri, Motoko Serino, E. Sonbas, Michael Stamatikos, Rhaana Starling, G. Tagliaferri, Aaron Tohuvavohu, Silvia Zane, Houri Ziaeepour

Maia A. Williams et al 2023 The Astrophysical Journal Letters 946 .

Provider: AAS Journals

Caption: Figure 1.

BAT raw light curve from the rate data. Panel (a) shows the raw light curve in the 15–350 keV band with a time binning of 1.6 s. This light curve was made from BAT quad-rate data, which records continuous count rates from all active detectors in four different energy ranges (15–25, 25–50, 50–100, and 100–350 keV). The time period when the GRB was occulted by the Earth (within 69° of the Earth center) is marked in green. Spacecraft slew times are marked in gray. The two BAT trigger times are marked by red lines. Panel (b) shows the partial coding fraction as a function of time. A partial coding fraction of 0 indicates that the GRB was outside of the BAT coded field of view, and a value of 1 indicates that the source is in the highest sensitivity region of the BAT coded field of view.

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