Guest Observer Facilities & Science Centers Select One AGILE ASCA BeppoSAX COBE CGRO Chandra EUVE Fermi (formerly GLAST) GALEX HETE-2 INTEGRAL ROSAT RXTE Suzaku Swift WMAP XMM-Newton NASA Archives Select One ADS AstroGravS EOSDIS HORIZONS IRSA LAMBDA MAST Michelson NED NSSDC NStED PDS SDAC SPDF Spitzer Science Center HEASARC Tip: View all tips Recommendation for HEASARC Dataset Identification To help the HEASARC (and readers) identify which particular mission datasets have been analyzed in any paper presenting such results, the HEASARC recommends that the standard observation identifiers for the relevant datasets be explicitly listed in the paper, e.g., the 'seq id' value(s) for an ASCA or ROSAT observation, or the 'obsid' value(s) for an RXTE or XMM-Newton observation. Please contact the HEASARC if you need information about what the recommended observation identifiers for other X-ray and gamma-ray missions are.