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On the Deceleration and Spreading of Relativistic Jets I: Jet Dynamics
Paul C. Duffell, Tanmoy Laskar
Jet breaks in gamma ray burst (GRB) afterglows provide a direct probe of their collimation angle. Modeling a jet break requires an understanding of the "jet spreading" process, whe…
Hydrogen-Poor Superluminous Supernovae from the Pan-STARRS1 Medium Deep Survey
R. Lunnan, R. Chornock, E. Berger +31
We present light curves and classification spectra of 17 hydrogen-poor superluminous supernovae (SLSNe) from the Pan-STARRS1 Medium Deep Survey (PS1 MDS). Our sample contains all o…
A VLA Study of High-redshift GRBs II - The Complex Radio Afterglow of GRB 140304A: Shell Collisions and Two Reverse Shocks
Tanmoy Laskar, Edo Berger, Raffaella Margutti +6
We present detailed multi-frequency, multi-epoch radio observations of GRB 140304A at from 1 to 86 GHz and 0.45 d to 89 d. The radio and mm data exhibit unusual multiple…
A VLA Study of High-redshift GRBs I - Multi-wavelength Observations and Modeling of GRB 140311A
Tanmoy Laskar, Edo Berger, Ryan Chornock +3
We present the first results from a recently concluded study of GRBs at with the Karl G. Jansky Very Large Array (VLA). Spanning to GHz and 7 epochs from 1.5…
A Reverse Shock and Unusual Radio Properties in GRB 160625B
K. D. Alexander, T. Laskar, E. Berger +9
We present multi-wavelength observations and modeling of the exceptionally bright long -ray burst GRB 160625B. The optical and X-ray data are well-fit by synchrotron emission fr…
The properties of GRB 120923A at a spectroscopic redshift of z=7.8
N. R. Tanvir, T. Laskar, A. J. Levan +37
Gamma-ray bursts (GRBs) are powerful probes of early stars and galaxies, during and potentially even before the era of reionization. Although the number of GRBs identified at z>6 r…