1. Neutrino Point Source Searches with AMANDA-II m-DAQ
Jim Braun
IceCube Fall 2007 Collaboration Meeting

2. Progress Since Lake Geneva
2005 unblinded:
2006 unblinded:
Improvements in methodology:
Internal report on methodology coming soon

3. Review: Sensitivity
Improvement:
~30%

4. Use of Energy Information
Mean number of signal events required to reach 5s in 50% of simulated experiments at d=42.5o
2006 data is background
Compare unbinned search with and without using Nch
Utilizing Nch information improves discovery potential for spectral indices g < 3.3
Effect is 30% for E-2, representing a 45% total improvement over the binned search

5. 2005 Unblinding NGC 1275 0.064 Object P-value MGRO J2019+37 0.152
Mrk 501
0.184
Mrk 421 ~1
NGC 1275
0.064
Crab Nebula
Cyg X-3
0.458
GRS
0.581
log10(p-value)
80% Chance of observing
p = given 26 sources
Highest Significance: 3.58s
Chance Probability: 69%

6. 2006 Unblinding GRS 1915+105 0.005 Object P-value MGRO J2019+37 0.064
Mrk 501 ~1
Mrk 421
0.227
NGC 1275
Crab Nebula
0.456
Cyg X-3
0.012
GRS
0.005
Significance
12% Chance of observing
p = given 26 sources
Highest Significance: 3.58s
Chance Probability: 84%

7. 2005 + 2006 3.82s * 10-11 TeV cm-2 s-1 Significance
Sensitivity of analysis near
E2dF/dE = 7x10-11 TeV cm-2 s-1
5 year search: 5x10-11 TeV cm-2 s-1
Object
P-value
m90*
MGRO J
0.065
12.83
Mrk 501
0.228
8.83
Mrk 421 ~1
5.71
NGC 1275
0.106
10.98
Crab Nebula
0.438
6.67
Cyg X-3
0.033
13.37
GRS
0.031
14.12
Significance
3.82s
* TeV cm-2 s-1

8. Plans for
Expect to combine with Zeuthen five year data set
Will not reoptimize cuts for
Expected sensitivity: ~3x10-11 TeV cm-2 s-1
Finish by the end of the year
Will not include B10 data as previously planned
465 total events in most recent analysis
Considering poorer angular resolution and 25% contamination, equivalent to less than 40 days AMANDA-II livetime

9. The Crab (Because Everyone Keeps Asking)
: Excess (10 events, 6 expected)
: Slight excess
2006 IC-9: Excess
If the excesses are indeed a signal, we would possibly observe ~3s for this source
Significance reduced to ~2s with a catalogue of 26 sources
Depends on Nch values of events observed in