Chandra ivo://nasa.heasarc/chanmaster NASA/GSFC HEASARC SAO/CXC; HEASARC 2026-10-09 NASA/GSFC HEASARC help desk heasarc-vo at athena.gsfc.nasa.gov Observation This database table contains all of the observations made by the Chandra X-Ray Observatory (CXO, formerly known as the Advanced X-ray Astrophysics Facility or AXAF) as part of the Performance Verification and Calibration (PVC) phase and also contains all of the subsequent Cycles' Guaranteed Time Observers (GTO) and General Observer (GO) targets, and any Director's Discretionary Time (DDT) targets that have been observed. It also includes scheduled and as-yet-not-scheduled targets. The HEASARC updates this database table on a twice-weekly basis by querying the database table at the Chandra X-Ray Center (CXC) website, as discussed in the Provenance section. For observations whose status is 'archived', data products can be retrieved from the HEASARC's mirror of the CXC's Chandra Data Archive (CDA). The CXC should be acknowledged as the source of Chandra data. The PVC phase was during the first few months of the CXO mission; some of the calibration observations that are for monitoring purposes will be performed in later mission cycles. All calibration data (entries with Type = CAL in this database) are placed immediately into the CXO public data archive at the Chandra X-Ray Observatory Center (CXC); please see the Web page at <a href="http://asc.harvard.edu/">http://asc.harvard.edu/</a> for more information on the CXC data archive). GTO observations during Cycle 1 or any subsequent Cycle will probably occupy 100% of months 3-4, 30% of months 5-22, and 15% of the available time for the remainder of the mission. Guaranteed Time Observers will have the same proprietary data rights as General Observers (i.e., their data will be placed in the public CXC archive 12 months after they have received the data in usable form). For detailed information on the Chandra Observatory and datasets see: <pre> <a href="http://cxc.harvard.edu/">http://cxc.harvard.edu/</a> for general Chandra information <a href="http://cxc.harvard.edu/cda/">http://cxc.harvard.edu/cda/</a> for the Chandra Data Archive <a href="http://cxc.harvard.edu/cal/">http://cxc.harvard.edu/cal/</a> for calibration information <a href="http://cxc.harvard.edu/caldb/">http://cxc.harvard.edu/caldb/</a> for the calibration database <a href="http://cxc.harvard.edu/ciao/">http://cxc.harvard.edu/ciao/</a> for data analysis <a href="http://cxc.harvard.edu/ciao/download/">http://cxc.harvard.edu/ciao/download/</a> for analysis software <a href="http://cxc.harvard.edu/ciao/threads/">http://cxc.harvard.edu/ciao/threads/</a> for analysis threads <a href="http://cda.harvard.edu/chaser/">http://cda.harvard.edu/chaser/</a> for WebChaSeR </pre> The HEASARC updates this database table on a twice-weekly basis based on information obtained from the Chandra Data Archive at the CXC website. This is a service provided by NASA HEASARC . https://heasarc.gsfc.nasa.gov/W3Browse/all/chanmaster.html Archive Research served-by HEASARC TAP https://heasarc.gsfc.nasa.gov/xamin/vo/cone?showoffsets&table=chanmaster& GET text/xml 180 99999 true 91.42333 -86.63194 0.35 https://heasarc.gsfc.nasa.gov/xamin/vo/tap https://heasarc.gsfc.nasa.gov/cgi-bin/W3Browse/getvotable.pl?name=chanmaster GET text/xml https://heasarc.gsfc.nasa.gov/cgi-bin/W3Browse/w3query.pl?tablehead=name=heasarc_chanmaster&Action=More+Options&Action=Parameter+Search&ConeAdd=1 https://heasarc.gsfc.nasa.gov/xamin/vo/ssa?table=chanmaster& GET text/xml+votable query pointed archival FK4 360.0 500 10000 180 10000000 POS=91.42333,-86.63194&SIZE=0.35&REQUEST=queryData https://heasarc.gsfc.nasa.gov/xamin/vo/sia?table=chanmaster& GET text/xml+votable POS Search Position in the form "ra,dec" where ra and dec are given in decimal degrees in the ICRS coordinate system. Cutout 91.42333 -86.63194 0.35 0.35 CHANDRA 0.35 X-ray public chanmaster Chandra Observations obsid Observation Identifier meta.id;obs int nullable status Status of Observation meta.code.status;obs char nullable name Target Designation meta.id;meta.main char nullable ra Right Ascension degree pos.eq.ra;meta.main double nullable dec Declination degree pos.eq.dec;meta.main double nullable "time" Start Time of Observation (UTC) mjd time.start;obs double nullable detector Detector instr;instr.det char nullable grating Grating Setting instr;instr.det char nullable exposure Actual Exposure Time If Observed, Otherwise the Approved Exposure (s) s time.duration;obs.exposure double nullable type Type of Observation (GO,GTO,CAL,TOO,DDT) meta.note;obs char nullable "pi" PI of Observation meta.id.PI char nullable public_date Public Date mjd time.release int nullable bii Galactic Latitude degree pos.galactic.lat double nullable cycle AO Number (0=calibration phase) short nullable sequence_number Sequence Number meta.id int nullable lii Galactic Longitude degree pos.galactic.lon double nullable category Subject Category src.class char nullable class Browse Object Classification src.class short nullable data_mode Operational Mode of the Detector instr.setup;instr.det char nullable proposal Proposal Number char nullable "__x_ra_dec" System unit vector column double nullable "__y_ra_dec" System unit vector column double nullable "__z_ra_dec" System unit vector column double nullable "__row" System index column char nullable