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HETE-II HETE-II CatalogueCatalogue

Filip MFilip Müünz andnz andGraziella Pizzichini Graziella Pizzichini

for HETE for HETE team team

Burst statistics in

HETE GRB Catalogue SAIt meeting, Teramo 2008 2

► gamma-ray detectorgamma-ray detectorFrench Gamma-ray TelescopeFrench Gamma-ray Telescope (FREGATE): (FREGATE): 5-400 keV; ~5-400 keV; ~ππ FOV FOVno localizationno localization

► position sensitive instrumentsposition sensitive instrumentsWide-Field X-ray MonitorWide-Field X-ray Monitor (WXM): (WXM): 2-25 keV; ~5’-10’ localizations2-25 keV; ~5’-10’ localizationsSoft X-ray CamerasSoft X-ray Cameras (SXC): (SXC): 2-10 keV; ~40” 2-10 keV; ~40” localizationslocalizationssmall eff. surface / sensitivitysmall eff. surface / sensitivity

► direct alert transmission direct alert transmission through simple VHF stations through simple VHF stations along the equatorial trajectory along the equatorial trajectory (incl. Italian base at (incl. Italian base at MalindiMalindi))

High Energy Transient Experiment – High Energy Transient Experiment – IIII

very small scale missionvery small scale missionmass: 123 kgsize: 89 x 66 cm (launch size)

HETE GRB Catalogue SAIt meeting, Teramo 2008 3

Alert distributionAlert distribution

IASF-BO people

E. MorelliF. GianottiP. FerreroF. MunzG. Pizzichini

equatorial orbit @ 625 km

HETE GRB Catalogue SAIt meeting, Teramo 2008 4

Detector responseDetector response► FREGATEFREGATE

large FoV implies high large FoV implies high background (with Earth background (with Earth occultation of sources due occultation of sources due to fixed pointing )to fixed pointing )

► WXMWXM extension to lower extension to lower

energies with complicated energies with complicated response matrix (1-D response matrix (1-D coded masks)coded masks)

HETE GRB Catalogue SAIt meeting, Teramo 2008 5

HETE bursts and flashesHETE bursts and flashes

► 1292 GCN alerts1292 GCN alerts► 173 bursts173 bursts

► 143 localized143 localized► (110 within 1 hour)(110 within 1 hour)

HETE GRB Catalogue SAIt meeting, Teramo 2008 7

HETE catalogHETE catalogcompleting, verifying, mining … completing, verifying, mining …

HETE GRB Catalogue SAIt meeting, Teramo 2008 8

Catalogue structureCatalogue structure► Database (mySQL) with object Database (mySQL) with object

interface (and interface (and web replication web replication )) Numerical Python, Django, JQueryNumerical Python, Django, JQuery

► light-curve profiles in ASCII/FITSlight-curve profiles in ASCII/FITS procedures to load and subtract procedures to load and subtract

backgroundbackground

Burst (trigger info)

Alert (time of distribution)

Spectral fits

Band (X/gamma)

Peak (times,fluence)

Literature refer.Afterglow measures

GCN notices

Position info

HETE GRB Catalogue SAIt meeting, Teramo 2008 9

GRB entryGRB entry

► All links on one pageAll links on one page to general catalogueto general catalogue to GCN noticesto GCN notices to literatureto literature custom noticescustom notices

HETE GRB Catalogue SAIt meeting, Teramo 2008 10

Checking the catalogueChecking the catalogue

► correlation of different correlation of different variables (160 entries)variables (160 entries) looking for outlierslooking for outliers

HETE GRB Catalogue SAIt meeting, Teramo 2008 12

AfterglowsAfterglows• Many bursts have good coverage of optical afterglowsMany bursts have good coverage of optical afterglows

• Combining with analysis of prompt lightcurvesCombining with analysis of prompt lightcurves

HETE GRB Catalogue SAIt meeting, Teramo 2008 13

Success of followupsSuccess of followups

► highlightshighlights► GRB 030329B (690/488)GRB 030329B (690/488)► GRB 021004 (178/123)GRB 021004 (178/123)► GRB 020813 (77/67)GRB 020813 (77/67)

• result of ground-obs. friendly (anti-solar) HETE pointing

• too many bursts in SWIFT era

(until 2007)

HETE GRB Catalogue SAIt meeting, Teramo 2008 14

Prompt emissionPrompt emission► FREGATE analysis FREGATE analysis

in 4 spectral in 4 spectral bandsbands time sampling time sampling

at cca 0.1 sat cca 0.1 s conversion to conversion to

physical units physical units using off-axis using off-axis angle and spectral angle and spectral shapeshape

► spectrum fitted spectrum fitted in 69 casesin 69 cases

HETE GRB Catalogue SAIt meeting, Teramo 2008 15

Lightcurve analysisLightcurve analysis

• trying to extract trying to extract more detailed more detailed information information besides besides T90/fluenceT90/fluence

• developing developing methods for methods for identification of identification of peaks peaks rise/fall timerise/fall time variation of variation of

hardness ratiohardness ratio

HETE GRB Catalogue SAIt meeting, Teramo 2008 16

Lightcurve paradeLightcurve parade

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Lightcurve analysisLightcurve analysis• Sometimes Sometimes

the main the main structurestructurecomes with comes with considerable considerable delaydelay

(no (no backgroundbackgroundinformation information afterafter the the burst)burst)

HETE GRB Catalogue SAIt meeting, Teramo 2008 18

Lightcurve analysisLightcurve analysis• in some cases in some cases

the baseline the baseline level islevel isnot evident not evident at all!at all!

• aim is to verify aim is to verify the catalogued the catalogued values and values and deepen the deepen the understanding of understanding of X-ray rich events X-ray rich events

HETE GRB Catalogue SAIt meeting, Teramo 2008 19

Work in progressWork in progress

► make catalogue ready for publicmake catalogue ready for public checking outlierschecking outliers linking the literaturelinking the literature polishing the interfacepolishing the interface

► prompt emission studiesprompt emission studies more detailed statisticsmore detailed statistics comparison with other datasets (BATSE, Swift)comparison with other datasets (BATSE, Swift)

► need for robust peak-analysis techniqueneed for robust peak-analysis technique

► better pseudo-redshift indicatorbetter pseudo-redshift indicator