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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…
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…
When Did the Remnant of GW170817 Collapse to a Black Hole?
Ramandeep Gill, Antonios Nathanail, Luciano Rezzolla
The main hard pulse of prompt gamma-ray emission in GRB170817A had a duration of and its onset was delayed with respect to the gravitational-wave chirp signa…