Nicholas H. M. Caldwell

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We present early observations of the afterglow of the Gamma-Ray Burst (GRB) 030329 and the spectroscopic discovery of its associated supernova SN 2003dh. We obtained spectra of the afterglow of GRB 030329 each night from March 30.12 (0.6 days after the burst) to April 8.13 (UT) (9.6 days after the burst). The spectra cover a wavelength range of 350 nm to(More)
A novel influenza A(H1N1)2009 variant with mildly reduced oseltamivir and zanamivir sensitivity has been detected in more than 10% of community specimens in Singapore and more than 30% of samples from northern Australia during the early months of 2011. The variant, which has also been detected in other regions of the Asia-Pacific, contains a S247N(More)
Pandemic H1N1 influenza virus is of global health concern and is currently the predominant influenza virus subtype circulating in the southern hemisphere 2010 winter. The virus has changed little since it emerged in 2009, however, in this report we describe several genetically distinct changes in the pandemic H1N1 influenza virus. These variants were first(More)
Observations of the quiescent X-ray nova XTE J1118+480 with the new 6.5 m MMT have revealed that the velocity amplitude of the dwarf secondary is 698 ± 14 km s −1 and the orbital period of the system is 0.17013 ± 0.00010 d. The implied value of the mass function, f(M) = 6.00 ± 0.36 M ⊙ , provides a hard lower limit on the mass of the compact primary that(More)
This paper describes a software tool that demonstrates the effects of common vision and hearing impairments on image and sound files. This helps designers to understand and empathize with the difficulties that less able users might experience when using their products and interfaces. A range of impairments and severity levels are simulated and guidance is(More)