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... HST . ... Data . ... HST Overview . Overview . ... Data Analysis . ... CONTENTS: - GHRS NEWS + Throughput Changes + Background and Dark Measurements + Paper Products - NEW GHRS DOCUMENTATION + ISR-076: G140L Flat Fields - RECENT PREPRINTS - APPENDIX: GHRS CONTACTS ================================================================================ Throughput Changes ------------------ We remind observers that we have seen changes in the absolute throughput of the GHRS since the 1993 Servicing Mission. ...

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... Proposing for VLBI Time at Arecibo . ... Documentation (Field System, VLBA4 terminal, Mark 5 system) . ... In 2001, the Arecibo Observatory received its hybrid VLBA-MARK IV (VLBA4) data acquisition system, and currently NAIC commits Arecibo to support VLBI observing up to a maximum of 4% of the 305-m's observing time. ... Tracking Time (h:mm) . ... The inclusion of the 305-m Arecibo radio telescope can dramatically boost the sensitivity of VLBI observations, even with its limited source tracking...

From Paul S. Ray . Discovery of Periodic Phase Modulation in LSI +61 303 Radio Outbursts by P. C. Gregory, M. Peracaula, and A. R. Taylor, ApJ, in press (1999) . Bayesian Periodic Signal Detection: Analysis of 20 Years of Radio Flux Measurements of the X-ray Binary LSI +61 303 by P. C. Gregory, ApJ, in press (1999) . ... The ASCA X-ray Spectrum of the Unusual Binary LSI +61 303 ( 195k .ps ), D. Leahy, F. Harrison, and A. Yoshida, ApJ , 475 , 823 (1997). ...

. Please use the following for publications and media citations: . "Based on observations obtained with Apache Point Observatory's 0.5-m Astrophysical Research Consortium Small Aperture Telescope." . List of publications based on 0.5-m observations (TBD) . for questions or comments contact archive server .

... Armagh Observatory, College Hill, Armagh BT61 9DG, +44 (0)28 3752 2928 . Access to Information under the Data Protection Act and the Freedom of Information Act . ... Annual Reports . ... Armagh Observatory and Planetarium Annual Financial Reports . ... The Partial Solar Eclipse of Friday 20th March 2015 - leaflet, PDF . ... The Armagh Observatory Grounds and Astropark - leaflet, PDF . The Armagh Observatory Grounds and Astropark - flyer, PDF . ... A Tour of Armagh Observatory - PDF . ...

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CHIANTI - an atomic database for emission lines. ... K.P.Dere, E.Landi, H.E.Mason, B.C.Monsignori-Fossi, P.R.Young, 1997, A , 125, 149 . Article: Available from ADS . The Arcetri Spectral Code for thin plasmas . E.Landi M.Landini 1998, A , 133, 1 . ... E.Landi, M.Landini K.P.Dere, P.R.Young, H.E.Mason, 1999, A , 135, 339 . ... K.P.Dere, E.Landi, P.R.Young, G.Del Zanna, 2001, ApJS, 134, 331 . ... G.Del Zanna, B.J.I.Bromage, E.Landi, M.Landini, 2001, A , 379, 708 . ...

... Help pages are formatted and converted automatically to HTML for presentation in the GUI (or on the WWW), or to Postscript for hardcopy output. ... XHelp is a GUI browser for the IRAF help system which uses existing help facilities in IRAF to locate documents, but provides a familiar web-browser interface. ... Easy access to auxiliary help documents such as package ``system documents'' and task source code, . ... Extensions to LROFF to support HTML style document links within IRAF help pages. ...