NICERMASTR ivo://nasa.heasarc/nicermastr NASA/GSFC HEASARC NICER Science and Mission Operations Center 2026-10-09 NASA/GSFC HEASARC help desk heasarc-vo at athena.gsfc.nasa.gov Observation This table records high-level information for the observations obtained with NICER (Neutron star Interior Composition ExploreR) and provides access to the NICER data archive. NICER is a NASA Explorer program Mission of Opportunity dedicated to the study of the neutron stars, exploring the exotic states of matter where density and pressure are higher than in atomic nuclei. NICER instrument is a payload aboard the International Space Station (ISS). It was launched on 3 June 2017 on a SpaceX Falcon 9 rocket and placed on the ISS. Normal operation started on 17 July 2017 after a commission phase to test the system and perform initial calibration. NICER's X-ray Timing Instrument (XTI) consists of an aligned collection of 56 X-ray "concentrator" optics (XRC) and silicon drift detector (SDD) pairs working in the energy range of 0.2-12 keV. Each XRC collects X-rays over a large geometric area from a roughly 30 arcmin<sup>2</sup> region of the sky and focuses them onto a small SDD. The SDD detects individual photons, recording both energies (with a 3% energy resolution at 6 keV) and high precision times (with 100 nanoseconds RMS relative to Universal Time). During one day of operation, NICER monitors several sources. For each observed source the data are divided into intervals of one day and labeled with a sequence number. This database table contains one record for each sequence number and includes parameters related to the observation. This contents of this database table are generated at the NICER Science and Mission Operations Center (SMOC) and updated regularly with new observations. Note that some fields have been added and are populated by the HEASARC. This is a service provided by NASA HEASARC . https://heasarc.gsfc.nasa.gov/W3Browse/all/nicermastr.html Archive Research served-by HEASARC TAP https://heasarc.gsfc.nasa.gov/xamin/vo/cone?showoffsets&table=nicermastr& GET text/xml 180 99999 true 0 -90 0.25 https://heasarc.gsfc.nasa.gov/xamin/vo/tap https://heasarc.gsfc.nasa.gov/cgi-bin/W3Browse/getvotable.pl?name=nicermastr GET text/xml https://heasarc.gsfc.nasa.gov/cgi-bin/W3Browse/w3query.pl?tablehead=name=heasarc_nicermastr&Action=More+Options&Action=Parameter+Search&ConeAdd=1 NICER 0.25 X-ray public nicermastr NICER Master Catalog name Designation of the Pointed Source meta.id;meta.main char nullable ra Right Ascension (Pointing Position) degree pos.eq.ra;meta.main double nullable dec Declination (Pointing Position) degree pos.eq.dec;meta.main double nullable "time" Start Time of the Observation mjd time.start;obs double nullable obsid Unique Observation/Sequence Number meta.id;obs char nullable exposure Effective Total Observation Exposure s time.duration;obs.exposure double nullable processing_status Status of Processing meta.code char nullable processing_date Date of Processing mjd time.processing double nullable public_date Public Date mjd time.release int nullable obs_type Observation Type: NOR, CAL, DDT, NOR-TOO, CAL-TOO, or DDT-TOO meta.code;obs char nullable mpu0_exposure Unfiltered Exposure of MPU0 s time.duration;obs.exposure double nullable abstract Proposal Abstract meta.abstract char nullable num_processed Number of Times Sequence Has Been Processed meta.number short nullable cycle Proposal Cycle Number obs.proposal.cycle short nullable coordinated Flag Indicates Observation Was Coordinated with Other Facility meta.code;instr.obsty short nullable time_awarded Time Awarded for Observation s time.duration double nullable caldb_version Version of the Calibration Database (CALDB) Used for Processing meta.version;instr.calib char nullable mpu3_exposure Unfiltered Exposure of MPU3 s time.duration;obs.exposure double nullable end_time Stop Time of the Observation mjd time.end;obs double nullable remarks Remarks Concerning Observation meta.note char nullable target_ra Target Right Ascension degree pos.eq.ra double nullable target_id Unique Target Identifier meta.id;src int nullable subject_category Proposal Category src.class char nullable pi_fname Proposal Principal Investigator First Name meta.id.PI char nullable mpu2_exposure Unfiltered Exposure of MPU2 s time.duration;obs.exposure double nullable mpu1_exposure Unfiltered Exposure of MPU1 s time.duration;obs.exposure double nullable title Proposal Title meta.title;obs.proposal char nullable num_fpm Number of Focal Plain Modules (FPM) After Screening meta.number short nullable facility If Coordinated, Short Name of Other Facility meta.note;instr.obsty char nullable mpu6_exposure Unfiltered Exposure of MPU6 s time.duration;obs.exposure double nullable processing_version Version of Processing Software meta.version;meta.dataset char nullable orig_target_id Original Target Identifier from NICER Planning System meta.id;src int nullable mpu5_exposure Unfiltered Exposure of MPU5 s time.duration;obs.exposure double nullable bii Galactic Latitude (Pointing Position) degree pos.galactic.lat double nullable target_class Target Classification src.class char nullable galactic_nh Galactic Column Density cm^-2 phys.columnDensity double nullable lii Galactic Longitude (Pointing Position) degree pos.galactic.lon double nullable mpu4_exposure Unfiltered Exposure of MPU4 s time.duration;obs.exposure double nullable target_dec Target Declination degree pos.eq.dec double nullable software_version Software Version Used in the Pipeline meta.version;meta.software char nullable category_code Category Code meta.code;src.class short nullable pi_lname Proposal Principal Investigator Last Name meta.id.PI char nullable prnb Proposal Number meta.number;obs.proposal 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