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Nicole Marie Lloyd-Ronning

Nicole Lloyd-Ronning

Phone (505) 665-5421


My expertise is in high energy astrophysics, with a focus on gamma-ray bursts.  Some of my work is devoted to using gamma-ray bursts as cosmological tools, but the majority involves understanding their intrinsic properties - their emission mechanisms, particle acceleration processes, and the nature of their inner engine. 

 I am heavily involved in public scientific outreach.  I lead the outreach effort at the Center for Theoretical Astrophysics at LANL, developing a variety of programs and regularly visiting schools throughout northern New Mexico to do hands-on physics experiments with students. I run a UNM-LA Community Education class on modern astrophysics, have helped develop the curriculum and a mentorship program for an astronomy class at Los Alamos Middle School, occasionally give planetarium shows at the PEEC, and participate in the Bradbury's Scientist Ambassador program.

 I am on the faculty at University of New Mexico, Los Alamos where I teach a variety of physics classes for undergraduates.


B.A. in Physics, Cornell University, 1996

Ph.D. in Physics, Stanford University, 2001


LANL Positions


Scientist, CCS-2 (Computational Physics; Compa Industries), Sept. 2016 - present

M. Hildred Blewett Fellow; Aug. 2015 - Aug. 2016

Director’s Postdoctoral Fellow, Jan. 2004 - Jan. 2005


Professional Societies

American Physical Society

American Astronomical Society




Distinguished Mentor Award, 2019

Compa/LANL Spot Award, 2019

M. Hildred Blewett Fellowship, American Physical Society, 2015


LANL Director's Postdoctoral Fellowship Award, 2003

National Research Council Award (declined), 2001

CITA Postdoctoral Fellowship award, 2001

McMicking Fellowship for Excellence in Graduate Physics, Stanford, 2000



Selected Publications:

Lloyd-Ronning, Nicole M.; Aykutalp, Aycin; Johnson, Jarrett L.; On the Cosmological Evolution of Long Gamma-ray Burst Properties, 2019, MNRAS, in press

Besla, Gurtina; Huppenkothen, Daniela; Lloyd-Ronning, Nicole; et al.; Astro2020: Training the Future Generation of Computational Researchers, 2019, White paper for the Astro2020 Decadal Survey

Corsi, Alessandra; Lloyd-Ronning, Nicole M.; Carbone, Dario, et al.; Radio Counterparts of Compact Object Mergers in the Era of Gravitational-Wave Astronomy, 2019, White paper for the Astro2020 Decadal Survey

Fryer, Chris L.; Lloyd-Ronning, Nicole; Wollaeger, Ryan; Wiggins, Brandon; Miller, Jonah; Dolence, Josh; Ryan, Ben; Fields, Carl E.; Understanding the Engines and Progenitors of Gamma-Ray Bursts, 2019, Review Paper

Lloyd-Ronning, Nicole M; Fryer, Chris; Miller, Jonah M.; Prasad, Neelima; Torres, Chris; Martin, Phillip; Constraints on gamma-ray burst inner engines in a Blandford-Znajek framework, 2019, MNRAS, 485, 203

Lloyd-Ronning, Nicole M.; Gompertz, Ben; Pe'er, Asaf; Dainotti, Maria; Fruchter, Andy; A Comparison between Radio Loud and Quiet Gamma-Ray Bursts, and Evidence for a Potential Correlation between Intrinsic Duration and Redshift in the Radio Loud Population, 2019, ApJ, 871, 118

Lloyd-Ronning, Nicole; Reverse Shock Emission from Short GRBs; 2018, Galaxies, 6, 103

Wiggins, Brandon K.; Fryer, Christopher L.; Smidt, Joseph M.; Hartmann, Dieter; Lloyd-Ronning, Nicole; Belcynski, Chris; The Location and Environments of Neutron Star Mergers in an Evolving Universe, 2018, ApJ, 865, 27

Lloyd-Ronning, Nicole M; Lei, Wei-hua; Xie, Wei; A MAD Explanation for the Correlation between Bulk Lorentz Factor and Minimum Variability Timescale; 2018, MNRAS, 979

Lloyd-Ronning, Nicole M; Science with an ngVLA: Radio Emission from Short Gamma-ray Bursts in the Multi-Messenger Era; 2018, Chapter to be published in ngVLA book.

Lloyd-Ronning, Nicole M.; Fryer, Christopher L.; On the Lack of Radio Afterglow from Some Gamma-Ray Bursts: Insight Into their Progenitors?; 2017, MNRAS, 467, 3413

Lloyd-Ronning, Nicole M.; Dolence, Joshua C.; Fryer, Christopher L;  A MAD Model for Gamma-ray Burst Variability; 2016, MNRAS, 461, 1045

Lloyd-Ronning, Nicole M.; Fryer, Christopher L.; Particle Acceleration in Relativistic Electron-Ion Outlfows; 2016, arXiv1603.04190

Guo, Fan; Li, Xiaocan; Li, Hui; Daughton, William; Zhang, Bing; Lloyd-Ronning, Nicole; Liu, Yi-Hsin; Zhang, Haocheng; Deng, Wei; Efficient Production of High-energy Nonthermal Particles during Magnetic Reconnection in a Magnetically Dominated Ion–Electron Plasma; 2016, ApJ, 818, L9

Mesler, R. A.; Whalen, Daniel J.; Smidt, Joseph; Fryer, Chris L.; Lloyd-Ronning, N. M.; Pihlström, Y. M.; The First Gamma-Ray Bursts in the Universe; 2014 ApJ, 787, 91

Mesler, Robert A.; Whalen, Daniel J.; Lloyd-Ronning, Nicole M.; Fryer, Chris L.; Pihlström, Ylva M.; Gamma-Ray Bursts in Circumstellar Shells: A Possible Explanation for Flares; 2012, ApJ, 757, 117

 Lloyd-Ronning, Nicole M.; Zhang, Bing; On the Kinetic Energy and Radiative Efficiency of Gamma-Ray Bursts; 2004, ApJ, 613, 477

Gehrels, N.; Chincarini, G.; Giommi, P.; Mason, K. O.; Nousek, J. A.; Wells, A. A.; White, N. E.; Barthelmy, S. D.; Burrows, D. N.; Cominsky, L. R.; and 61 coauthors; The Swift Gamma-Ray Burst Mission; 2004, ApJ, 611, 1005

Zhang, Bing; Dai, Xinyu; Lloyd-Ronning, Nicole M.; Mészáros, Peter; Quasi-universal Gaussian Jets: A Unified Picture for Gamma-Ray Bursts and X-Ray Flashes; 2004, ApJ, 601, L119

Lloyd-Ronning, Nicole M.; Dai, Xinyu; Zhang, Bing; On the Structure of Quasi-universal Jets for Gamma-Ray Bursts; 2004, ApJ, 601, 371

Lloyd-Ronning, Nicole M.; Ramirez-Ruiz, Enrico; On the Spectral Energy Dependence of Gamma-Ray Burst Variability; 2002, ApJ, 576, 101

Lloyd-Ronning, Nicole M.; Fryer, Chris L.; Ramirez-Ruiz, Enrico; Cosmological Aspects of Gamma-Ray Bursts: Luminosity Evolution and an Estimate of the Star Formation Rate at High Redshifts; 2002, ApJ, 574, 554

Ramirez-Ruiz, Enrico; Lloyd-Ronning, Nicole M.; Beam models for gamma-ray bursts sources: outflow structure, kinematics and emission mechanisms; 2002, New Astronomy, 7, 197

Lloyd-Ronning, Nicole M.; Petrosian, Vahé; Interpreting the Behavior of Time-resolved Gamma-Ray Burst Spectra; 2002, ApJ, 565, 182

Lloyd, Nicole M.; Petrosian, Vahé; Mallozzi, Robert S.; Cosmological versus Intrinsic: The Correlation between Intensity and the Peak of the νFν Spectrum of Gamma-Ray Bursts; 2000, ApJ, 534, 227

Lloyd, Nicole M.; Petrosian, Vahé; Synchrotron Radiation as the Source of Gamma-Ray Burst Spectra; 2000, ApJ, 543, 722

Lloyd, Nicole M.; Petrosian, Vahé; Distribution of Spectral Characteristics and the Cosmological Evolution of Gamma-Ray Bursts; 1999, ApJ, 511, 550