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title = {{Constraining properties of {GRB} magnetar central engines using the observed plateau luminosity and duration correlation}},  journal = {Monthly Notices of the Royal Astronomical Society},  }  @article{Richardson_2002,  author = {Dean Richardson and David Branch and Darrin Casebeer and Jennifer Millard and R. C. Thomas and E. Baron},  title = {{A Comparative Study of the Absolute Magnitude Distributions of Supernovae}},  journal = {The Astronomical Journal},  volume = {123},  number = {2},  pages = {745},  url = {http://stacks.iop.org/1538-3881/123/i=2/a=745},  year = {2002},  abstract = {The Asiago Supernova Catalog is used to carry out a comparative study of supernova absolute magnitude distributions. An overview of the absolute magnitudes of the supernovae in the current observational sample is presented, and the evidence for subluminous and overluminous events is examined. The fraction of supernovae that are subluminous ( M B > -15) appears to be higher (perhaps much higher) than ##IMG## [http://ej.iop.org/images/1538-3881/123/2/745/img1.gif] but it remains very uncertain. The fraction that are overluminous ( M B > -20) is lower (probably much lower) than 0.01. The absolute magnitude distributions for each supernova type, restricted to events within 1 Gpc, are compared. Although these distributions are affected by observational bias in favor of the more luminous events, they are useful for comparative studies. We find mean absolute blue magnitudes (for H 0 = 60) of -19.46 for normal Type Ia supernovae (SNe Ia), -18.04 for SNe Ibc, -17.61 and -20.26 for normal and bright SNe Ibc considered separately, -18.03 for SNe II-L, -17.56 and -19.27 for normal and bright SNe II-L considered separately, -17.00 for SNe II-P, and -19.15 for SNe IIn.},  }