1. Update on the GRB Triggered Shower Analysis
Corey Reed (Nikhef)
Eleonora Presani (Nikhef)
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Reconstruction
Internal note registered
ANTARES-SOFT
Explains M-est shower fitter, bbfit hit selection
Includes study of value of sigma in M-estimator
Shows tagging of sparking events
Reference for how to run the fit module
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Background Data
Have re-run the 2008 background data
Use new calibs from Heide (include line offsets)
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Background Data
Have re-run the bkgnd
Alignment chosen automatically during running
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Background Data
Have re-run the bkgnd
Data looks fairly consistent. A couple of runs with large # of events.
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Background Data
2007 data has also been run
Diagnostic plots not yet checked, but very easy to do
All output files are on HPSS
See wiki page for
File locations
Software version used to make files
Dates productions were run
Software options
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7. Signal MC Have re-run the signal MC simulations
Use same neutrino generation files
Now processed with Trigger Efficiency
OLD MC
NEW MC bkg
Number lines 12
10-12, from data
Optical bkg rate
100 kHz
~60-80, from data
Optical bkg charge
1pe, smear + high pe tail, à la module from Erlangen
1pe, smear + high pe tail, à la Trigger Efficiency
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8. Signal MC The signal MC work-flow is now: NuGen (SeaTray)
MMC+Photonics (SeaTray)
MC Event Writer (SeaTray)
Trigger Efficiency
AntaresReader+ShowerFit (SeaTray)
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9. Signal MC The signal MC work-flow is now: This didn't exist before!
NuGen (SeaTray)
This didn't exist before!
MMC+Photonics (SeaTray)
MC Event Writer (SeaTray)
Trigger Efficiency
AntaresReader+ShowerFit (SeaTray)
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10. Signal MC Have re-run the signal MC simulations
Example check: were the right OM's turned off?
X-Y hit positions in MC when background timeslice from 10-line event
X-Y hit positions in 10-line data run
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Signal MC
Have re-run the signal MC simulations
Other checks led to issue discussed in the e-log
Analysis e-log #486
Basically, with Trigger Efficiency:
-C1 + no threshold = OK
-C2 + threshold file = OK
-C1 + threshold file = NOT ok
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Signal MC
Have re-run the signal MC simulations
Done for both:
2008 (10-12 line) background data set
2007 (5-line) background data set
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Signal MC
With this new signal MC
Have quickly re-optimized cuts
Old background + new signal MC: looks ok!
New background + new signal MC: still to do (~1 day)
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Systematic Study
One systematic study looked at
Smeared hit times after Trg Eff (2008 bkg)
Check effect on reconstruction
Smear by 2ns gaus
Hit residuals differ slightly
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Systematic Study
One systematic study looked at
Smeared hit times after Trg Eff (2008 bkg)
Basically no effect
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Systematic Study
One systematic study looked at
Smeared hit times after Trg Eff (2008 bkg)
Basically no effect
Hit selection has wide time windows
Resolution already ~6 ns anyway
Certainly no effect on analysis
Time resolution of shower fit completely unimportant
Search time window ~2 minutes!
2ns smearing has essentially no effect on efficiency
Aart/Claudio already showed: not bigger than 3ns
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Mupage MC
Want to have Mupage MC
NOT for background estimation!
BUT... MMC+photonics used for our signal MC
Not used before in Antares analysis
Photon tables made with older OM acceptance function
Therefore, want:
Mupage generated events
Muons, photons propagated in SeaTray
Compare to (background) data
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18. Mupage MC Mupage work-flow is:
Mupage gen. after km3 (to save time – hits ignored)
AntReader+MMC+Photonics (SeaTray)
MC Event Writer (SeaTray)
Trigger Efficiency
AntaresReader+ShowerFit (SeaTray)
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Mupage MC
Not so trivial...
Some details of the MC run header weren't being read in SeaTray yet
Made a new mediadef file for Mupage + r12 detector
See e-log analysis 488
MMC+Photonics is VERY slow on these events
Split processing of Mupage files to 50k event bunches
First files ready today (after Trg Eff)
But haven't had time to make diagnostic plots yet
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Plan
Still to do
1) Mupage / Data comparison
Most likely our biggest systematic
Both 2007, 2008 (TrgEff and later -- all very fast)
The hope: distributions have same shape
Determine scale factor from Mupage, apply to signal MC
ETA: next week
2) Optimize cuts for 2008, 2007
With new background + new MC ETA: before Wednesday (easy to do when Eleonora's back)
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Plan
Still to do
3) Systematic study: reduce efficiency
Throw away X% of hits (X<15% accord to Aart/Claudio)
What X to use?
Re-run trigger, reconstruction
Both 2008, 2007
ETA: Before 17th
4) Write analysis internal note
ETA: Before collaboration meeting
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Plan
Still to do
5) Do (or decide to ignore) time smear for MC
6) Ask for unblinding (first of 2007, then 2008)
ETA: 1-2 weeks after analysis note is submitted
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