1. Marcus Ziegler SCIPP/UCSCPulsar VRVS Meeting 1 Pulsar Blind search on DC2 data Gamma-ray Large Area Space Telescope Marcus Ziegler Bill Atwood Brian Baughman Robert Johnson

2. Marcus Ziegler SCIPP/UCSCPulsar VRVS Meeting 2 Basic Idea take only differences with  t < max_diff max_diff used for DC2 data = 20 000s Calculate the Fourier-Transform of the time differences of the photon arrival times  t n.

3. Marcus Ziegler SCIPP/UCSCPulsar VRVS Meeting 3 Data Selection As input all sources listed in the LATSourceCatalog_v1 were used (=> 380 sources) James Chiang and Johann Cohen helped to write a Python script to: - Pick a source from the catalog - Select all photons within a 2° radius around the source (no energy dependent cut yet!) - Correct the photon arrival time - Output the data into a text file -> Calculate differences and Perform the FFT

4. Marcus Ziegler SCIPP/UCSCPulsar VRVS Meeting 4 Finding a Pulsar Candidate -> Calculate differences and Perform the FFT Source MRF0035 Look for frequency with the highest power Found F0 = 19.371213 1/s DC2 Catalog = 19.371221 1/s -> Scan takes about 5s

5. Marcus Ziegler SCIPP/UCSCPulsar VRVS Meeting 5 Scan in Frequency derivative No F1 correction F1 corrected for Crab Found 2x Crab F0 = 59.81810 1/s F1 = -7.5370E-10 -> 1x Crab F0 = 29.90905 1/s F1 = -3.7685E-10 DC2 Catalog F0 = 29.90928 1/s F1 = -3.7638E-10 -> Scan takes about 15 min

6. Marcus Ziegler SCIPP/UCSCPulsar VRVS Meeting 6 Source_IDLBFrequency_F0Best_F1Significance deg 1/s1/s*sPower/RMSIdentified asName MRF005460.7250-0.14905.885930-1.65E-1214446? MRF0168263.5487-2.779211.197233-1.44E-117442PSR_B0833m45Vela MRF0138195.12984.27064.217670-9.35E-142190PSR_J0633p1746Geminga MRF0139193.59443.67634.217677-7.00E-131384PSR_J0633p1746**Geminga MRF0035106.58082.907919.371214-3.07E-111068PSR_J2229p6114 MRF010659.3618-27.63390.602221-9.55E-12839? MRF0143359.20441.09023.097110-1.00E-13821PSR_J1739m2903 MRF0154313.61650.165914.667230-1.80E-11423PSR_J1420m6048 MRF00410.1154-0.06453.097115-1.30E-12417PSR_J1739m2903* MRF0184350.5521-4.78961.952324-6.00E-13404PSR_J1741m3927 MRF005843.4240-0.34623.916926-2.82E-12326? MRF0157283.1113-0.60457.148900-1.10E-12312PSR_J1015m5719 MRF0142358.9358-0.61363.097115-6.00E-13242PSR_J1739m2903* MRF0109173.7560-28.97680.304744-7.50E-13224? MRF00819.4664-11.90352.973213-1.27E-12198PSR_J1638m5226 MRF0187184.5983-5.824059.818109-7.54E-10129PSR_B0531p212xCrab MRF0182333.6831-3.73322.936838-6.99E-1393PSR_J1638m5226 MRF0158284.0851-2.03627.148929-7.48E-1284PSR_J1015m5719* MRF0151337.15010.17526.492376-2.50E-1279PSR_J1637m4642 MRF0169265.9231-1.554011.197200-1.99E-1173PSR_B0833m45**Vela MRF0219344.705735.626040.404841-1.16E-1070? MRF0150337.87800.10726.492376-2.90E-1267PSR_J1637m4642* MRF0149290.3235-0.83173.559923-7.12E-1360PSR_J1104m6103 MRF0222340.050641.554912.011871-4.03E-1154? MRF0175312.0262-0.895714.667253-1.43E-1153PSR_J1420m6048* MRF047139.9590-42.250845.085335-1.17E-1047? MRF0156284.9472-0.54167.148895-4.99E-1247PSR_J1015m5719* MRF0437142.4304-44.832725.362730-3.42E-1047?

7. Marcus Ziegler SCIPP/UCSCPulsar VRVS Meeting 7 The most significant sources MRF0054

8. Marcus Ziegler SCIPP/UCSCPulsar VRVS Meeting 8 Summary + Future plans - Scan found 12 Pulsars that were listed in the DC2 pulsar database - The scan found one unknown high significance pulsing source Things to improve - Use photon selection criteria based on the GLAST PSF - Use a longer integration time (increase the maximum difference) to increase the sensitivity.