Post on 19-Jan-2016
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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
HETE GRB Catalogue SAIt meeting, Teramo 2008 17
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