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Short-Hard Gamma-Ray Bursts in Young Host Galaxies: the Effect of Prompt Twins
Krzysztof Belczynski, K. Z. Stanek, Chris L. Fryer
We investigate the effect of including a significant ``binary twin'' population (binaries with almost equal mass stars, q = M2/M1 > 0.95) for the production of double compact objec…
Go Long, Go Deep: Finding Optical Jet Breaks for Swift-Era GRBs with the LBT
X. Dai, P. M. Garnavich, J. L. Prieto +20
Using the 8.4m Large Binocular Telescope, we observed six GRB afterglows from 2.8 hours to 30.8 days after the burst triggers to systematically probe the late time behaviors of aft…
A Photometric Survey for Variables and Transits in the Field of Praesepe with KELT
Joshua Pepper, K. Z. Stanek, Richard W. Pogge +5
The Kilodegree Extremely Little Telescope (KELT) project is a small aperture, wide-angle search for planetary transits of solar-type stars. In this paper, we present the results of…
Deep MMT Transit Survey of the Open Cluster M37 I: Observations and Cluster Parameters
J. D. Hartman, B. S. Gaudi, M. J. Holman +6
We have conducted a deep ($15 \la r \la 23$), 20 night survey for transiting planets in the intermediate age open cluster M37 (NGC 2099) using the Megacam wide-field mosaic CCD cam…
LBT Discovery of a Yellow Supergiant Eclipsing Binary in the Dwarf Galaxy Holmberg IX
J. L. Prieto, K. Z. Stanek, C. S. Kochanek +14
In a variability survey of M81 using the Large Binocular Telescope we have discovered a peculiar eclipsing binary (MV ~ -7.1) in the field of the dwarf galaxy Holmberg IX. It has a…
An Unexpectedly Swift Rise in the Gamma-ray Burst Rate
Matthew D. Kistler, Hasan Yuksel, John F. Beacom +1
The association of long gamma-ray bursts with supernovae naturally suggests that the cosmic GRB rate should trace the star formation history. Finding otherwise would provide import…