764 citations
Counting papers with at most 25 authors, so collaboration author lists do not stand in for the people here.
- University College DublinIE182 papers
- Center for Astrophysics Harvard & SmithsonianUS167 papers
- Purdue University West LafayetteUS154 papers
- McGill UniversityCA153 papers
- University of California, Santa CruzUS151 papers
- Washington University in St. LouisUS150 papers
- Iowa State UniversityUS149 papers
- University of California, Los AngelesUS149 papers
- University of UtahUS149 papers
- Columbia UniversityUS138 papers
- Munster Technological UniversityIE138 papers
- University of ChicagoUS138 papers
6 papers · 2 filters
A Photometric Method for estimating CNO Abundances in Globular Clusters
David Peat, Raymond Butler
Stromgren indices v and b are combined with broad-band index I, and a new index p, the short wavelength half of the v band, to estimate CN 4215A molecular absorption in a sample of…
A new survey of variability in the core of M15 with TRIFFID-2
Seathrun O'Tuairisg, Raymond Butler, Andy Shearer +2
A two-week campaign of high-resolution imaging of the centre of M15 using the tip/tilt correcting TRIFFID-2 camera, followed by analysis with ISIS (image matching & subtraction sof…
PSR B1951+32 and PSR J0537-6910 - where are the optical counterparts?
R. F. Butler, A. Golden, A. Shearer +1
There remain several definitive gamma-ray pulsars that are as yet undetected in the optical regime. A classic case is the pulsar PSR B1951+32, associated with the complex CTB 80 SN…
Detection of new Optical Counterpart candidates to PSR B1951+32 with HST/WFPC2
R. F. Butler, A. Golden, A. Shearer
There remain several definitive gamma-ray pulsars that are as yet undetected in the optical regime. A classic case is the pulsar PSR B1951+32, associated with the complex CTB 80 SN…
Discovery of Spectral Variability of Markarian 421 at TeV Energies
F. Krennrich, I. H. Bond, S. M. Bradbury +38
The detection of spectral variability of the gamma-ray blazar Mrk 421 at TeV energies is reported. Observations with the Whipple Observatory 10m gamma-ray telescope taken in 2000/2…
Detection of the BL Lac Object H1426+428 at TeV Gamma Ray Energies
D. Horan
A very high energy (VHE) gamma-ray signal has been detected at the 5.4 sigma level from H1426+428, an x-ray selected BL Lacertae object at a redshift of 0.129. The object was monit…