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HETE-2

HETE-2. Overview.

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HETE-2

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  1. HETE-2 Mike Corcoran

  2. Overview The High Energy Transient Explorer (HETE-2) is a “University-Class” (small) scientific satellite designed to detect and localize gamma-ray bursts. The coordinates of GRBs detected by HETE are distributed to interested ground-based observers within seconds of burst detection, thereby allowing detailed observations of the initial phases of GRBs. Follow-on to HETE (lost just after launch, Nov 1996). Hete-2 Launched Oct 9, 2000 • Instruments: • French Gamma Telescope (FREGATE): • Instrument type NaI(TI); cleaved • Energy Range 6 to 400 keV • Timing Resolution 10 microseconds • Effective Area 120 cm2 • Sensitivity (10 sigma) 3x10-8 erg cm-2s-1, over 8 keV-1 MeV • Field of View 3 steradians • Wide Field X-ray Monitor (WXM; Riken/LANL) • Instrument type Coded Mask with Position Sensitive Proportional Counter • Energy Range 2 to 25 keV • Timing Resolution 1 ms • Sensitivity (10 sigma) ~8x10 -9 erg cm -2s -1 over the 2-10 keV range • Field of View 1.6 steradians (FWZM) • Angular resolution +-11 arcmin (normal incidence, 8 keV) • Soft X-ray Camera (SXC; MIT/MKI) • Energy Range: 500 eV to 14 keV • Timing Resolution: 1.2 s • Field of View: 0.91 sr • Focal Plane scale: 33" per CCD pixel • Burst Sensitivity: (4 sigma) 0.47 cts cm-2 s-1 • Steady source Sensitivity: (4 sigma) ~700 mCrab t -1/2 • Localization Precision: 80" (systematic + statistical) 90% conf limits Mike Corcoran

  3. Mission Status • All instruments (Fregate, WXM & SXC) currently operating nominally; problems early on • Since last HUG meeting (2004): • 27 refereed publications in ADS • 34 bursts (24 Fregate triggers, 4 WXM triggers, 6 Ground Analysis) • GRB050709: first optical afterglow of a short-hard burst associated with a late-type galaxy at z=0.16. “Solved mystery of short-hard bursts” See Villasenor et al., 2005, Nature 437, 855 Mike Corcoran

  4. Archive Status HEASARC is the primary archive for HETE-2 • ~260 GB of data in IPP format - optimized for efficient burst analysis (not long-term archive) • Fregate 3-band lightcurves for all available GRBs • XSPEC-compatible spectra and response matrices for Fregate bursts • Hete2help: 3 contacts since 2000 • Data transfer to community ~700 MB (mostly in 2005) Mike Corcoran

  5. HETE2 Metadata • Browse tables: • hete2gcn: searchable list of all HETE2 gcn notices with links to data • hete2grb: searchable list of all HETE2 bursts with links to data and to MIT burst pages • hete2tl: searchable HETE2 timeline with data links • xtime: hete2 pointing timeline (like hete2tl) Mike Corcoran

  6. Website & Software • HEASARC Hete2 website contains general information about Hete2, links to burst web pages • /FTP/hete2/ops contains downloadable software (solaris binaries and perl/c-shell scripts): Not user friendly Mike Corcoran

  7. Future status • HETE-2 not involved in current senior review round • NASA 07 budget request Mike Corcoran

  8. Future Plans • MIT funding runs out in Jun 06; operations authorized until Sep 06 • HEASARC will • maintain archive of all IPP data • maintain mirror of MIT HETE2 website • transfer all processing/analysis software from MIT to HEASARC for download • maintain calibration data • Continue to investigate conversion of data into standard format on a best-effort basis Mike Corcoran

  9. Lessons Learned • Primary GRB science goals achieved/exceeded in an exceptionally low-cost mission (<$600K yr-1 for DA) • “Triage decision”: Insufficient funds were provided to PI team to undertake secondary (non-GRB) science analyses • Small missions often have to decide between main mission science vs. long-term archiving: Main mission science (usually) wins Mike Corcoran

  10. Lessons Learned (cont) • Producing data in standard formats readable by software outside of mission-developed tools is essential for broader use. • Projects should incorporate long-term archive plans in their PDMP to maximize long-term usefulness • Adherence to data standards (FITS) from outset is important for long-term archiving & data ease-of-use, but there are (some) mission costs. • Convert telemetry to FITS! • Adherence to software standards is important too (but this isn’t free either) Mike Corcoran

  11. How the HEASARC can Help The HEASARC helps minimize effort for small projects to standardize data: • enabling easy creation/verification of FITS files (cfitsio) • providing well-defined, easy to understand, easy to find data standards (“OGIP Standards”) • Expandable software standards (HEASoft) • Calibration infrastructure (CALDB) Even small missions can find “data attractiveness” Mike Corcoran

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