2 NRAO.GBTSA ivo://nrao/GBTSA National Radio Astronomy Observatory National Radio Astronomy Observatory https://info.nrao.edu/nrao-brand/logo-1/logo-png 2015-10-30 1.0 National Radio Astronomy Observatory megamasers nrao green bank neutral hydrogen radio galaxies extragalactic agn spectra spectroscopy spectral water maser galaxy gbt High frequency water maser and HI spectra are available through this web service. The water maser phenomena are found in active galactic nuclei (AGN) and have been surveyed with the NRAO Green Bank Telescope. HI spectra are measured mostly from galaxies in the local Universe. https://vo.nrao.edu/gbtsa/ Archive Research 2 https://vo.nrao.edu/apps/gbtsa/ssap? minimal pointed archival ICRS 23 10 20 https://vo.nrao.edu/apps/gbtsa/ssap?pos=23.0,10&size=20 2 https://vo.nrao.edu/apps/gbtsa/ssap?pos=23.0,10&size=20 text/xml 2 https://vo.nrao.edu/gbtsa/ Radio