5,109 research outputs found
Estimating the Explosion Time of Core-Collapse Supernovae from Their Optical Light Curves
Core-collapse supernovae are among the prime candidate sources of high energy
neutrinos. Accordingly, the IceCube collaboration has started a program to
search for such a signal. IceCube operates an online search for neutrino
bursts, forwarding the directions of candidate events to a network of optical
telescopes for immediate follow-up observations. If a supernova is identified
from the optical observations, in addition to a directional coincidence a
temporal photon-neutrino coincidence also needs to be established. To achieve
this, we present a method for estimating the supernova explosion time from its
light curve using a simple model. We test the model with supernova light curve
data from SN1987A, SN2006aj and SN2008D and show that the explosion times can
be determined with an accuracy of better than a few hours.Comment: Version accepted for publication by Astroparticle Physics; 13 pages,
5 figure
Student Attainment and the Milwaukee Parental Choice Program
In this report we examine high school completion and postsecondary enrollment (a.k.a. “educational attainment”) of the cohort of 9th grade students who were in the Milwaukee Parental Choice Program (MPCP) at the beginning of our state-mandated evaluation of the MPCP in 2006. After tracking the MPCP 9th graders following the 2006-07 year and comparing them to a carefully matched sample of 9th graders who were in Milwaukee Public Schools (MPS) during the 2006-07 year, we use a combination of parent surveys and administrative (school) records to estimate attainment
School and Sector Switching in Milwaukee
In this report we analyze the movement of students to and from the Milwaukee Parental Choice Program (MPCP) and Milwaukee Public Schools (MPS). We also analyze student mobility between schools within each sector. The analysis rests on two separate sets of data: the administrative records we have collected as part of our separate analysis of academic achievement in MPCP (Witte , Wolf, Cowen, Fleming, & Lucas-McLean, 2010), and the results of an extensive set of surveys collected from parents of private and public school students
Weak interactions and quasi-stable particle energy loss
We discuss the interplay between electromagnetic energy loss and weak
interactions in the context of quasistable particle particle propagation
through materials. As specific examples, we consider staus, where weak
interactions may play a role, and taus, where they don't.Comment: 4 pages, 4 figures, to appear in the proceedings of the Second
Workshop on TeV Particle Astrophysics (August 2006, Madison, WI
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