A Spectacular Radio Flare from XRF 050416a at 40 Days and Implications for the Nature of X-Ray Flashes
Soderberg, A M; Nakar, Ehud; Cenko, Stephen B; Cameron, P B; Frail, Dale A; Kulkarni, Shrinivas R; Fox, Derek B; Berger, Edo; Gal-Yam, Avishay; Moon, D-S; Anderson, Gemma; Price, Paul Antony; Schmidt, Brian; Salvo, Maria; Rich, Joshua; Rau, Arne; Ofek, Eran; Chevalier, Roger A; Hamuy, M; Harrison, F A; Kumar, P; MacFadyen, A I; McCarthy, P J; Park, H-S; Peterson, Bruce; Phillips, Mark M; Rauch, M; Roth, M; Shectman, Stephen
We present detailed optical, near-infrared, and radio observations of the X-ray flash XRF 050416a obtained with Palomar and Siding Springs Observatories, as well as the HST and VLA, placing this event among the best-studied X-ray flashes to date. In addition, we present an optical spectrum from Keck LRIS from which we measure the redshift of the burst, z = 0.6528. At this redshift the isotropic-equivalent prompt energy release was about 10 51 ergs, and using a standard afterglow synchrotron...[Show more]
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