Nelson 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 SN2003dh. 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 850(More)
Based on data from the MMTO 6.5m telescope, the Magellan 6.5m Clay telescope, and the FLWO 1.5m telescope Harvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, MA 02138; kstanek, tmatheson, ncaldwell, pchallis, wbrown, rschild, dbersier@cfa.harvard.edu Department of Physics, University of Notre Dame, 225 Nieuwland Science Hall, Notre(More)
We present optical and near-infrared photometry and spectroscopy of the type Ia SN 1998bu in the Leo I Group galaxy M96 (NGC 3368). The data set consists of 356 photometric measurements and 29 spectra of SN 1998bu between UT 1998 May 11 and July 15. The well-sampled light curve indicates the supernova reached maximum light in B on UT 1998 May 19.3 (JD(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)
The vasopressin (AVP) antagonist, SK&F 101926 (beta-mercapto-beta beta-cyclopentamethylene propionic acid1, D-Tyr(Et)2, Phe3, Val4, Asn5, Cys6, Pro7, Arg8-NH2), is an antidiuretic antagonist in rats and squirrel monkeys in vivo. In rat, dog, pig, squirrel monkey and human in vitro studies, SK&F 101926 is an AVP antagonist with no discernable agonist(More)
We present UBVRI photometry of 44 type-Ia supernovae (SN Ia) observed from 1997 to 2001 as part of a continuing monitoring campaign at the Fred Lawrence Whipple Observatory of the Harvard-Smithsonian Center for Astrophysics. The data set comprises 2190 observations and is the largest homogeneously observed and reduced sample of SN Ia to date, nearly(More)
We present multiband photometry of 185 type-Ia supernovae (SNe Ia), with over 11,500 observations. These were acquired between 2001 and 2008 at the F. L. Whipple Observatory of the Harvard-Smithsonian Center for Astrophysics (CfA). This sample contains the largest number of homogeneously observed and reduced nearby SNe Ia (z 0.08) published to date. It more(More)
Physiological regulation of receptor-effector pathways is recognized as a significant factor determining target organ selectivity and sensitivity in several hormonal systems. Whether or not physiological regulation of the renal vasopressin (V2) receptor-effector pathway participates in the control of body fluid homeostasis is unknown. We evaluated four(More)