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Title: MULTIWAVELENGTH OBSERVATIONS OF GRB 110731A: GeV EMISSION FROM ONSET TO AFTERGLOW

Journal Article · · Astrophysical Journal
 [1]; ; ; ; ; ;  [2];  [3]; ; ;  [4];  [5];  [6]; ;  [7];  [8];  [9];  [10];  [11];
  1. Deutsches Elektronen Synchrotron DESY, D-15738 Zeuthen (Germany)
  2. W. W. Hansen Experimental Physics Laboratory, Kavli Institute for Particle Astrophysics and Cosmology, Department of Physics and SLAC National Accelerator Laboratory, Stanford University, Stanford, CA 94305 (United States)
  3. Interactive Research Center of Science, Tokyo Institute of Technology, Meguro City, Tokyo 152-8551 (Japan)
  4. Istituto Nazionale di Fisica Nucleare, Sezione di Pisa, I-56127 Pisa (Italy)
  5. Istituto Nazionale di Fisica Nucleare, Sezione di Trieste, I-34127 Trieste (Italy)
  6. Department of Physics and Astronomy, Rice University, MS-108, P.O. Box 1892, Houston, TX 77251 (United States)
  7. Istituto Nazionale di Fisica Nucleare, Sezione di Padova, I-35131 Padova (Italy)
  8. Istituto Nazionale di Fisica Nucleare, Sezione di Perugia, I-06123 Perugia (Italy)
  9. Dipartimento di Fisica 'M. Merlin' dell'Universita e del Politecnico di Bari, I-70126 Bari (Italy)
  10. Laboratoire Leprince-Ringuet, Ecole polytechnique, CNRS/IN2P3, Palaiseau (France)
  11. Institut de Ciencies de l'Espai (IEEE-CSIC), Campus UAB, E-08193 Barcelona (Spain)
+ Show Author Affiliations

We report on the multiwavelength observations of the bright, long gamma-ray burst GRB 110731A, by the Fermi and Swift observatories, and by the MOA and GROND optical telescopes. The analysis of the prompt phase reveals that GRB 110731A shares many features with bright Large Area Telescope bursts observed by Fermi during the first three years on-orbit: a light curve with short time variability across the whole energy range during the prompt phase, delayed onset of the emission above 100 MeV, extra power-law component and temporally extended high-energy emission. In addition, this is the first GRB for which simultaneous GeV, X-ray, and optical data are available over multiple epochs beginning just after the trigger time and extending for more than 800 s, allowing temporal and spectral analysis in different epochs that favor emission from the forward shock in a wind-type medium. The observed temporally extended GeV emission is most likely part of the high-energy end of the afterglow emission. Both the single-zone pair transparency constraint for the prompt signal and the spectral and temporal analysis of the forward-shock afterglow emission independently lead to an estimate of the bulk Lorentz factor of the jet {Gamma} {approx} 500-550.

OSTI ID:
22167169
Journal Information:
Astrophysical Journal, Vol. 763, Issue 2; Other Information: Country of input: International Atomic Energy Agency (IAEA); ISSN 0004-637X
Country of Publication:
United States
Language:
English

Cited By (34)

Significant and variable linear polarization during the prompt optical flash of GRB 160625B journal July 2017
Phenomenology of Reverse-Shock Emission in the Optical Afterglows of Gamma-Ray Bursts journal March 2014
“SELF-ABSORBED” GeV LIGHT CURVES OF GAMMA-RAY BURST AFTERGLOWS journal May 2014
Grb 110731a: Early Afterglow in Stellar wind Powered by a Magnetized Outflow journal May 2015
On the magnetization of gamma-ray burst blast waves journal September 2013
Energies of GRB blast waves and prompt efficiencies as implied by modelling of X-ray and GeV afterglows journal September 2015
High-Energy Emission from Gamma-Ray Bursts journal January 2012
Unbiased Long-Term Monitoring at TeV Energies text January 2019
Modeling the Early Multiwavelength Emission in grb 130427a journal February 2016
Modeling the Early Afterglow in the Short and hard grb 090510 journal October 2016
Theoretical Description of GRB 160625B with Wind-to-ISM Transition and Implications for a Magnetized Outflow journal October 2017
Modeling the High-energy Emission in GRB 110721A and Implications on the Early Multiwavelength and Polarimetric Observations journal October 2017
The Origin of the Optical Flashes: The Case Study of GRB 080319B and GRB 130427A journal May 2018
The Bright and the Slow—GRBs 100724B and 160509A with High-energy Cutoffs at ≲100 MeV journal September 2018
The Environments of the Most Energetic Gamma-Ray Bursts journal October 2018
Closure Relations of Gamma-Ray Bursts in High Energy Emission journal September 2019
Origin for the Prompt Spectral Evolution Characteristics and High Energy Emission during the X-Ray Flare in GRB 180720B journal October 2019
Modeling the Observations of GRB 180720B: from Radio to Sub-TeV Gamma-Rays journal October 2019
Synchrotron Self-Compton as a Likely Mechanism of Photons beyond the Synchrotron Limit in GRB 190114C journal October 2019
Fermi and Swift Observations of GRB 190114C: Tracing the Evolution of High-energy Emission from Prompt to Afterglow journal February 2020
Analysis and Modeling of the Multi-wavelength Observations of the Luminous GRB 190114C journal July 2019
High-energy emission from gamma-ray bursts journal October 2018
Fermi and Swift Observations of GRB 190114C: Tracing the Evolution of High-Energy Emission from Prompt to Afterglow text January 2020
Unbiased Long-Term Monitoring at TeV Energies journal April 2019
On the magnetization of gamma-ray burst blast waves text January 2013
"Self-absorbed" GeV light-curves of Gamma-Ray Burst afterglows text January 2013
GRB 110731A: Early afterglow in stellar wind powered by a magnetized outflow text January 2015
Energies of GRB blast waves and prompt efficiencies as implied by modeling of X-ray and GeV afterglows text January 2015
Modeling the early multiwavelength emission in GRB130427A text January 2016
Theoretical Description Of GRB 160625B with Wind-to-ISM Transition and Implications for a Magnetized Outflow text January 2017
Modeling the high-energy emission in GRB 110721A and implications on the early multiwavelength and polarimetric observations text January 2017
The origin of the optical flashes: The case study of GRB 080319B and GRB 130427A text January 2018
Modeling the observations of GRB 180720B: From radio to sub-TeV gamma-rays text January 2019
Fermi and Swift Observations of GRB 190114C: Tracing the Evolution of High-Energy Emission from Prompt to Afterglow text January 2019

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Related Subjects

79 ASTROPHYSICS
COSMOLOGY AND ASTRONOMY
AFTERGLOW
COSMIC GAMMA BURSTS
EMISSION
GEV RANGE
MEV RANGE
OPACITY
TELESCOPES
X RADIATION