1. Results from 2007-08 data unblinding on point source analysis with the EM algorithm AWG videoconference meeting 24/03/2011(II) J.P Gómez-González AWG videoconference meet. 24/03/2011 0

2.  Search method review  Results from the candidate list search  Results for the all sky search  Summary Outline J.P Gómez-González AWG videoconference meet. 24/03/2011 1

3. Clustering algorithm EM free likelihood distribution example The EM algorithm is a clustering algorithm that analytically maximizes the likelihood We assume that source events follow a Gaussian distribution The width of this Gaussian includes the dependence of on the angular resolution of the detector: In the “free sigma case” the width can change during the maximization process between reasonable values. Remind that both sigmas are keep as independent parameters. In the “fixed sigma case” the width do not change and keeps the value extracted from the mc simulations J.P Gómez-González AWG videoconference meet. 24/03/2011 2

4. Data sample J.P Gómez-González AWG videoconference meet. 24/03/2011 Same events coordinates (checked) ~304 days of livetime 2190 events in the sample Cuts:  > -5.4,  < 1º, upgoing events Reconstruction method: aafit v0r8 3

5. Sky map J.P Gómez-González AWG videoconference meet. 24/03/2011 Sky map in equatorial coordinates showing the positions of the 2190 events used in the analysis 4

6. EM free candidate list search J.P Gómez-González AWG videoconference meet. 24/03/2011 pre-trial 5

7. EM fix candidate list search J.P Gómez-González AWG videoconference meet. 24/03/2011 pre-trial 6

8. NIKHEF PS analysis results J.P Gómez-González AWG videoconference meet. 24/03/2011 7

9. Summary of results J.P Gómez-González AWG videoconference meet. 24/03/2011 methodsourcedeclransiglikp-value EM freeHESS J1023-575-57.76155.833.324.320.18 EM freeGX 339-104.3-48.794.772.530.10 EM fixHESS J1023-575-57.76155.832.533.250.09 EM fixGX 339-104.3-48.791.772.460.25 Lik (NIKHEF)HESS J1023-575-57.76155.832.652.530.17 Lik (NIKHEF)GX 339-104.3-48.792.182.150.26 The most significant sources on the candidate list are found by all the “different” methods (compatible results in all cases) 8

10. Clusters from candidate list search Number of events fitted by the algorithm: 3.32 Likelihood ratio value: 4.32 P-value: 0.0074 x 24 ~ 17.8% probability (< 1.5  ) Gaussian width: sx = 1.10º, sy = 0.5º The gaussian is wider in the RA plane. Sigma parameters (X,Y) are independent EM free HESS J1023-575 J.P Gómez-González AWG videoconference meet. 24/03/2011 Green ellipse: pre-clustering cone Blue ellipse: fitted gaussian 9

11. Clusters from candidate list search Number of events fitted by the algorithm: 2.53 Likelihood ratio values: 3.25 P-value: 0.0036 x 24 ~ 8.7 % probability Now, the sigma values of the Gaussian are fixed EM fix HESS J1023-575 J.P Gómez-González AWG videoconference meet. 24/03/2011 Green ellipse: pre-clustering cone Blue ellipse: fitted gaussian event id: 1 -- decl: -57.839516 -- ar: 157.401820 -- nhit: 52 -- nline: 4 -- run: 27892 event id: 2 -- decl: -57.641273 -- ar: 154.210445 -- nhit: 39 -- nline: 8 -- run: 32490 event id: 3 -- decl: -57.742114 -- ar: 159.541817 -- nhit: 25 -- nline: 5 -- run: 33486 event id: 4 -- decl: -57.535276 -- ar: 156.459877 -- nhit: 70 -- nline: 6 -- run: 33713 Same cluster was found in the 5line analysis, but now we have only one event from that period 10

12. Clusters from candidate list search Number of events fitted by the algorithm: 4.77 Likelihood ratio value: 2.53 EM free GX 339 J.P Gómez-González AWG videoconference meet. 24/03/2011 Green ellipse: pre-clustering cone Blue ellipse: fitted gaussian 11

13. Clusters from all sky search EM free J.P Gómez-González AWG videoconference meet. 24/03/2011 clustdeclrabicnsig 1-36.7139.927.92.89 2-0.5043.267.12.89 clust 1 clust 2 Same cluster found in the NIKHEF analysis P > 95% (BG) 12

14. Clusters from all sky search EM fix J.P Gómez-González AWG videoconference meet. 24/03/2011 Green ellipse: pre-clustering cone Blue ellipse: fitted gaussian declrabicnsig -0.5043.287.12.89 Same cluster found by NIKHEF analysis event id: 0 -- decl: -0.569987 -- ar: 43.104131 -- nhit: 50 -- nline: 6 -- run: 36133 event id: 1 -- decl: -0.566569 -- ar: 42.962954 -- nhit: 42 -- nline: 8 -- run: 37151 event id: 2 -- decl: -0.348181 -- ar: 43.711867 -- nhit: 49 -- nline: 6 -- run: 34397 event id: 3 -- decl: -2.853588 -- ar: 42.782587 -- nhit: 24 -- nline: 3 -- run: 30437 13

15. J.P Gómez-González AWG videoconference meet. 24/03/2011  Sample from 2007-08 data unblinded  Similar results than previous analysis were found  Candidate list: HESS J1023-575  p ~ 17.8%  All sky: fully compatible with BG hypothesis Summary 14