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7 papers · 2 filters
Constraining the magnetic field structure in collisionless relativistic shocks with a radio afterglow polarization upper limit in GW170817
Ramandeep Gill, Jonathan Granot
Gamma-ray burst afterglows arise from relativistic collisionless shocks in which the postshock tangled magnetic field is produced by the two-stream and/or Weibel instabil…
Fermi and Swift Observations of GRB 190114C: Tracing the Evolution of High-Energy Emission from Prompt to Afterglow
M. Ajello, M. Arimoto, M. Axelsson +147
We report on the observations of gamma-ray burst (GRB) 190114C by the Fermi Gamma-ray Space Telescope and the Neil Gehrels Swift Observatory. The early-time observations reveal mul…
Discovery and Identification of MAXI J1621-501 as a Type I X-ray Burster with a Super-Orbital Period
Nicholas M. Gorgone, Chryssa Kouveliotou, Hitoshi Negoro +26
MAXI J1621-501 is the first Swift/XRT Deep Galactic Plane Survey transient that was followed up with a multitude of space missions (NuSTAR, Swift, Chandra, NICER, INTEGRAL, and MAX…
Anisotropic electron populations in BL Lac jets: consequences for the observed emission
F. Tavecchio, E. Sobacchi
We investigate the impact on the properties of high-energy emitting BL Lac objects of a population of electrons with an anisotropic momentum distribution. We adopt a simple phenome…
ALMA Detection of a Linearly Polarized Reverse Shock in GRB 190114C
Tanmoy Laskar, Kate D. Alexander, Ramandeep Gill +11
We present ALMA 97.5 GHz total intensity and linear polarization observations of the mm-band afterglow of GRB 190114C spanning 2.2 to 5.2 hours after the burst. We detect linear po…
Numerical Simulations of an Initially Top-Hat Jet and the Afterglow of GW170817/GRB170817A
Ramandeep Gill, Jonathan Granot, Fabio De Colle +1
The afterglow of GRB170817A/GW170817 was very unusual, slowly rising as , peaking at days, and sharply d…