Astronomy GRB & Transients Astrophysics Data System (ADS) astro-ph ApJ Recent Supernovae Magellan Telescopes (schedule, instruments) Gemini Telescopes (operations) Keck Observatory (schedule, instruments) Spitzer science center Chandra X-ray Observatory HST DwarfArchives.org Ned Wright's Cosmology Calculator Airmass table NED Simbad IRSA Jochen Greiner's GRB page GCN Swift Swift GRB table Swift quick-look data GRBlog Pan-STARRS (wiki) Shri Kulkarni Dale Frail Derek Fox
