Swift ivo://nasa.heasarc/swiftmastr NASA/GSFC HEASARC Swift Project; HEASARC 2026-04-03 NASA/GSFC HEASARC help desk heasarc-vo at athena.gsfc.nasa.gov Observation This table records high-level information for each Swift observation and provides access to the data archive. Each record is associated with a single observation that contains data from all instruments on board Swift. The BAT is the large field of view instrument and operates in the 10-300 keV energy band. The narrow field instruments, XRT and UVOT, operate in the X-ray and UV/optical regime, respectively. An observation is defined as a collection of snapshots, where a snapshot is defined as the time spent observing the same position continuously. Because of observing constraints, the length of a snapshot can be shorter than a single orbit and it can be interrupted because the satellite will point in a different direction of the sky or because the time allocated to that observation ends. The typical Swift observing strategy for a Gamma Ray Burst (GRB) and/or afterglow, consists of a serious of observations aimed at following the GRB and its afterglow evolution. This strategy is achieved with two different type of observations named Automatic Targets and Pre-Planned Targets. The Automatic Target is initiated on board soon after an event is triggered by the BAT. The Figure of Merit (FOM) algorithm, part of the observatory's autonomy, decides if it is worth requesting a slew maneuver to point the narrow field instruments (NFI) on Swift, XRT and UVOT, in the direction of the trigger. If the conditions to slew to the new position are satisfied, the Automatic Target observation takes place; all the instruments have a pre-set standard configuration of operating modes and filters and about 20000 seconds on source will be collected. The Pre-Planned Target observations instead are initiated from the ground once the trigger is known. These observations are planned on ground and uploaded onto the spacecraft. This database table is generated at the Swift processing site. During operation, it is updated on daily basis. This is a service provided by NASA HEASARC . https://heasarc.gsfc.nasa.gov/W3Browse/all/swiftmastr.html Archive Research served-by HEASARC TAP https://heasarc.gsfc.nasa.gov/xamin/vo/cone?showoffsets&table=swiftmastr& GET text/xml 180 99999 true 168.89296642 -89.99299278 0.416666666666667 https://heasarc.gsfc.nasa.gov/xamin/vo/tap https://heasarc.gsfc.nasa.gov/cgi-bin/W3Browse/getvotable.pl?name=swiftmastr GET text/xml https://heasarc.gsfc.nasa.gov/cgi-bin/W3Browse/w3query.pl?tablehead=name=heasarc_swiftmastr&Action=More+Options&Action=Parameter+Search&ConeAdd=1 SWIFT 0.416666666666667 Gamma-ray public swiftmastr Swift Master Catalog prnb Proposal Number int nullable uvot_expo_uu Effective Exposure on Source of UVOT Filter U s time.duration;obs.exposure;em.UV double nullable ra Right Ascension (Pointing Position) degree pos.eq.ra;meta.main double nullable xrt_expo_lr Effective Exposure on Source of Low Rate XRT Mode s time.duration;obs.exposure;em.X-ray double nullable bat_expo_rt Effective Exposure BAT Rate Mode s time.duration;obs.exposure;em.gamma double nullable target_id Unique Trigger Number with Any Degeneracy Removed meta.id;src int nullable saa_fraction Fraction of Observation Spent in the South Atlantic Anomaly (SAA) meta.code.qual;time.duration;obs.exposure double nullable "__row" System index column char nullable "pi" Principal Investigator Last Name meta.id.PI char nullable name Designation of the Pointed Source meta.id;src char nullable tdrss_flag Flag Indicates TDRSS Message Exists char nullable af_insaa Time in SAA Per Sequence, According to the As-Flown Timeline (s) s double nullable uvot_expo_w1 Effective Exposure on Source of UVOT Filter UVW1 s time.duration;obs.exposure;em.UV double nullable orig_obsid Observation Number as Originally Assigned (Orig_Target_ID + Orig_Obs_Segment) meta.id char nullable uvot_expo_vv Effective Exposure on Source of UVOT Filter V s time.duration;obs.exposure;em.opt double nullable "__x_ra_dec" System unit vector column double nullable dec Declination (Pointing Position) degree pos.eq.dec;meta.main double nullable bii Galactic Latitude (Pointing Position) degree pos.galactic.lat double nullable start_time Start Time of the Observation mjd time.start;obs double nullable roll_angle Roll Angle (degree) degree double nullable uvot_expo_m2 Effective Exposure on Source of UVOT Filter UVM2 s time.duration;obs.exposure;em.UV double nullable att_flag Attitude Flag meta.code.qual char nullable xrt_expo_pc Effective Exposure on Source of Photon Counting XRT Mode s time.duration;obs.exposure;em.X-ray double nullable stop_time Stop Time of the Observation mjd time.end;obs double nullable xrt_expo_im Effective Exposure on Source of Image Modes s time.duration;obs.exposure;em.X-ray double nullable bat_expo_pl Effective Exposure BAT Pulsar Mode s time.duration;obs.exposure;em.gamma double nullable orig_target_id Trigger Number as Originally Assigned meta.id;src int nullable uvot_expo_wh Effective Exposure on Source of UVOT Filter WHITE s time.duration;obs.exposure;em.UV double nullable xrt_expo_wt Effective Exposure on Source of Windowed Timing XRT Mode s time.duration;obs.exposure;em.X-ray double nullable lii Galactic Longitude (Pointing Position) degree pos.galactic.lon double nullable processing_version Version of Processing Script meta.version char nullable uvot_expo_gv Effective Exposure on Source of UVOT Filter VGRISM s time.duration;obs.exposure;em.UV double nullable xrt_exposure Effective Exposure on Source Considering All XRT Modes s time.duration;obs.exposure;em.X-ray double nullable grb_flag Flag Indicates Gamma-Ray Burst meta.code;src;em.gamma char nullable "__z_ra_dec" System unit vector column double nullable xrt_expo_pu Effective Exposure on Source of Piled-up XRT Mode s time.duration;obs.exposure;em.X-ray double nullable af_inslew Time in Slew Per Sequence, According to the As-Flown Timeline (s) s double nullable bat_no_masktag Number of Sources with Mask-Tag Rate within This Observation short nullable software_version Software Version Used in the Pipeline meta.version;meta.software char nullable "__y_ra_dec" System unit vector column double nullable uvot_expo_w2 Effective Exposure on Source of UVOT Filter UVW2 s time.duration;obs.exposure;em.UV double nullable bat_exposure Effective Exposure on Source Considering All BAT Event and Survey Modes s time.duration;obs.exposure;em.gamma double nullable uvot_expo_bb Effective Exposure on Source of UVOT Filter B s time.duration;obs.exposure;em.UV double nullable obs_segment True Observation Segment (Corrected Value) meta.id int nullable bat_expo_ev Effective Exposure BAT Event Mode s time.duration;obs.exposure;em.gamma double nullable uvot_exposure Effective Exposure on Source Considering All UVOT Filters and Modes s time.duration;obs.exposure double nullable cycle Proposal Cycle Number short nullable num_processed Number of Times Sequence Has Been Processed short nullable orig_obs_segment Observation Segment as Originally Assigned meta.id int nullable uvot_expo_mg Effective Exposure on Source of UVOT Filter Magnifier s time.duration;obs.exposure;em.UV double nullable af_onsource Time on Source Per Sequence, According to the As-Flown Timeline (s) s time.duration;obs.exposure double nullable bat_expo_mt Effective Exposure BAT Mask-Tag Mode s time.duration;obs.exposure;em.gamma double nullable archive_date Public Date mjd time.release int nullable processing_date Date of Processing mjd time.processing double nullable obsid Unique Observation Number (Target_ID + Obs_Segment) meta.id;meta.main char nullable uvot_expo_gu Effective Exposure on Source of UVOT Filter UGRISM s time.duration;obs.exposure;em.UV double nullable bat_expo_sv Effective Exposure BAT Survey Mode s time.duration;obs.exposure;em.gamma double nullable uvot_expo_bl Effective Exposure of UVOT Blocked Filter s time.duration;obs.exposure;em.UV double nullable af_total Total Time Per Sequence, According to the As-Flown Timeline (s) s time.duration;obs.sequence double nullable