Update on the GRB Triggered Shower Analysis Corey Reed (Nikhef) Eleonora Presani (Nikhef) 04 . 11 . 10 Astronomy Working Group Phone Conference

Astronomy Working Group Phone Conference Reconstruction Internal note registered ANTARES-SOFT-2010-006 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 04 . 11 . 10 Astronomy Working Group Phone Conference

Astronomy Working Group Phone Conference Background Data Have re-run the 2008 background data Use new calibs from Heide (include line offsets) 04 . 11 . 10 Astronomy Working Group Phone Conference

Astronomy Working Group Phone Conference Background Data Have re-run the 2008 bkgnd Alignment chosen automatically during running 04 . 11 . 10 Astronomy Working Group Phone Conference

Astronomy Working Group Phone Conference Background Data Have re-run the 2008 bkgnd Data looks fairly consistent. A couple of runs with large # of events. 04 . 11 . 10 Astronomy Working Group Phone Conference

Astronomy Working Group Phone Conference 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 04 . 11 . 10 Astronomy Working Group Phone Conference

Signal MC Have re-run the signal MC simulations Use same neutrino generation files Now processed with Trigger Efficiency OLD MC NEW MC + 2008 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 04 . 11 . 10 Astronomy Working Group Phone Conference

Signal MC The signal MC work-flow is now: NuGen (SeaTray) MMC+Photonics (SeaTray) MC Event Writer (SeaTray) Trigger Efficiency AntaresReader+ShowerFit (SeaTray) 04 . 11 . 10 Astronomy Working Group Phone Conference

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) 04 . 11 . 10 Astronomy Working Group Phone Conference

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 04 . 11 . 10 Astronomy Working Group Phone Conference

Astronomy Working Group Phone Conference 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 04 . 11 . 10 Astronomy Working Group Phone Conference

Astronomy Working Group Phone Conference 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 04 . 11 . 10 Astronomy Working Group Phone Conference

Astronomy Working Group Phone Conference 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) 04 . 11 . 10 Astronomy Working Group Phone Conference

Astronomy Working Group Phone Conference 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 04 . 11 . 10 Astronomy Working Group Phone Conference

Astronomy Working Group Phone Conference Systematic Study One systematic study looked at Smeared hit times after Trg Eff (2008 bkg) Basically no effect 04 . 11 . 10 Astronomy Working Group Phone Conference

Astronomy Working Group Phone Conference 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 04 . 11 . 10 Astronomy Working Group Phone Conference

Astronomy Working Group Phone Conference 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 04 . 11 . 10 Astronomy Working Group Phone Conference

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) 04 . 11 . 10 Astronomy Working Group Phone Conference

Astronomy Working Group Phone Conference 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 04 . 11 . 10 Astronomy Working Group Phone Conference

Astronomy Working Group Phone Conference 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) 04 . 11 . 10 Astronomy Working Group Phone Conference

Astronomy Working Group Phone Conference 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 04 . 11 . 10 Astronomy Working Group Phone Conference

Astronomy Working Group Phone Conference Plan Still to do 5) Do (or decide to ignore) time smear for 2007 MC 6) Ask for unblinding (first of 2007, then 2008) ETA: 1-2 weeks after analysis note is submitted 04 . 11 . 10 Astronomy Working Group Phone Conference