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The GROND gamma-ray burst sample. I. Overview and statistics
J. Greiner, T. Krühler, J. Bolmer +17
A dedicated gamma-ray burst (GRB) afterglow observing program was performed between 2007 and 2016 with GROND, a seven-channel optical and near-infrared imager at the 2.2m telescope…
The late-time afterglow evolution of long gamma-ray bursts GRB 160625B and GRB 160509A
Tuomas Kangas, Andrew S. Fruchter, S. Bradley Cenko +12
We present post-jet-break \textit{HST}, VLA and \textit{Chandra} observations of the afterglow of the long -ray bursts GRB 160625B (between 69 and 209 days) and GRB 160509A (bet…
A Surprising Lack of Metallicity Evolution with Redshift in the Long Gamma-Ray Burst Host Galaxy Population
J. F. Graham, P. Schady, A. S. Fruchter
The number of long-duration Gamma Ray Burst (LGRB) host galaxies with measured metallicities and host masses has now grown to over one hundred, allowing us to investigate how the d…
GRB 151027B - large-amplitude late-time radio variability
J. Greiner, J. Bolmer, M. Wieringa +20
Deriving physical parameters from gamma-ray burst afterglow observations remains a challenge, even now, 20 years after the discovery of afterglows. The main reason for the lack of…
A long optical plateau in the afterglow of the Extended Emission short GRB 150424A: Evidence for energy injection by a magnetar?
F. Knust, J. Greiner, H. J. van Eerten +14
Short-duration GRBs with extended emission form a subclass of short GRBs, comprising about 15% of the short-duration sample. Afterglow detections of short GRBs are also rare (about…
The Optical/NIR afterglow of GRB 111209A: Complex yet not Unprecedented
D. A. Kann, P. Schady, F. Olivares E. +24
Afterglows of Gamma-Ray Bursts (GRBs) are simple in the most basic model, but can show many complex features. The ultra-long duration GRB 111209A, one of the longest GRBs ever dete…