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DR. ANDREW S. FRIEDMAN
Massachusetts Institute of Technology, 77 Massachusetts Ave
Bldg. E51-185B, Cambridge MA, 02139, USA. (617) 253-4041
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Gamma Ray Burst Energetics and Cosmology
   Gamma-Ray Bursts (GRBs) are the brightest known explosions in the universe, thought to result from the collapse of massive stars and the formation of neutron stars or black holes, in a process that produces a highly energetic beam of gamma radiation, occasionally at the right viewing angle to be seen from earth, followed by a bright, multiwavelength afterglow at optical and other wavelengths. My master's thesis work in the Harvard University Department of Astronomy with Professor Ramesh Narayan and Professor Joshua Bloom focused on testing the potential applications of Gamma-Ray Bursts for cosmology by studying GRB spectra and energetics. We found that GRBs are currently not well-suited for precision cosmology compared to other better studied standardizable candles such as Type Ia supernovae, underscoring the difficulty of developing cosmological distance determination methods with novel classes of astrophysical events.
Papers
Toward a More Standardized Candle Using GRB Energetics and Spectra, Friedman, A.S. & Bloom, J.S. 2005, The Astrophysical Journal, Vol. 627, Issue 1, pp. 1-25, (astro-ph/0408413) (DOI)

Present and Future Prospects for GRB Standard Candles, Friedman, A.S. & Bloom, J.S. 2005, Il Nuovo Cimento C, Vol. 028, Issue 04-05, pp. 669-672, (astro-ph/0502559) (DOI)

Talks
The Promise and Limitations of GRB Standard Candles, Graduate Student Research Forum, Harvard University, (March 14, 2006)

The Present and Future of GRB Cosmology, Supernova Acceleration Probe (SNAP) Science Meeting, Lawrence Berkeley National Laboratories, Berkeley, California, (July 15, 2005)

Toward a More Standardized Candle Using GRB Energetics and Spectra, High Energy Astrophysics Division (HEAD) Lunch Talk, Harvard-Smithsonian CfA, Cambridge, MA, (Feb 9, 2005)

The Present and Future of GRB Cosmography, AAS Meeting #205, San Diego, CA, (Jan 9-13, 2005)

“Using GRBs For Cosmology” by Andrew Friedman,Sky & Telescope [PDF] (with Robert Naeye article below)
Posters
Toward a More Standardized Candle Using GRB Energetics and Spectra, 4th Workshop on Gamma-Ray Bursts in the Afterglow Era, Rome, Italy, (Oct 18-22, 2004)

Massachusetts Institute of Technology Harvard University Astronomy Smithsonian Astrophysical Observatory UC Berkeley Astronomy NSF Graduate Research Fellowship NASA Graduate Student Research Program Peters Automated Infrared Imaging Telescope (PAIRITEL) NASA Swift Satellite
Last Updated: Andrew Samuel Friedman, 9/2015

This material is based upon work supported by the National Science Foundation under NSF Award #1056580 (2012-2014) through an NSF Science, Technology, and Society Postdoctoral Fellowship at MIT and the NSF INSPIRE program via NSF Award #1541160 (2015-1018).

Original animations are shared under a
Creative Commons Attribution-NonCommercial-ShareAlike 3.0 US License