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The Robotic Palomar 60-inch Optical Afterglow Catalog: 2007 János Kelemen , Konkoly Observatory

The Robotic Palomar 60-inch Optical Afterglow Catalog: 2007 János Kelemen , Konkoly Observatory S. Bradley Cenko, CalTech. SRL Derek Fox, Penn State Univ. 2008 Nanjing GRB Meeting Session 4. - telescope - observations & data reductions - photometric results

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The Robotic Palomar 60-inch Optical Afterglow Catalog: 2007 János Kelemen , Konkoly Observatory

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  1. The Robotic Palomar 60-inch Optical Afterglow Catalog: 2007 János Kelemen, Konkoly Observatory S. Bradley Cenko, CalTech. SRL Derek Fox, Penn State Univ. 2008 Nanjing GRB MeetingSession 4

  2. - telescope - observations & data reductions - photometric results - some preliminary results - conclusions 2008 Nanjing GRB MeetingSession 4

  3. - telescope See reference: The Automated Palomar 60 Inch Telescope S. Bradley Cenko,1 Derek B. Fox,2 Dae-Sik Moon,1,3 Fiona A. Harrison,1 S. R. Kulkarni,4 John R. Henning,5 C. Dani Guzman,6 Marco Bonati,5 Roger M. Smith,5 Robert P. Thicksten,5 Michael W. Doyle,5 Hal L. Petrie,5 Avishay Gal-Yam,4,7 Alicia M. Soderberg,4 Nathaniel L. Anagnostou,8 and Anastasia C. Laity8 Publications of the Astronomical Society of the Pacific, 118:1396–1406, October 2006 2008 Nanjing GRB MeetingSession 4

  4. - telescope Filter characteristics Filter calibrations: Jordiet al. (2006). 2008 Nanjing GRB MeetingSession 4

  5. - observations & data reductions 2008 Nanjing GRB MeetingSession 4

  6. - observations & data reductions • No automatic methods • Data reduction by manual aperture photometry • Photometric standards: USNO, SDSS • Accuracy : 18  0.05 mg. • 22  0. 2 mg. • >22  0.3 – 0.5 mg. 2008 Nanjing GRB MeetingSession 4

  7. - some preliminary results • Ref: Cenko et al, in preparation 2008 Nanjing GRB MeetingSession 4

  8. - some preliminary results • Ref: A. Zeh, and S. Klose, and D.A. Kann, ApJ Vol. 637, 2006, pp. 889 - 900 2008 Nanjing GRB MeetingSession 4

  9. - some preliminary results: the case of „dark” bursts Ref: Cenko et al, in preparation In our sample, nearly 50%of afterglows are“dark” bursts (OX < 0.5) 2008 Nanjing GRB MeetingSession 4

  10. - some preliminary results: the case of „dark” GRB-s • DEFINITION based on optical versus X ray spectral index:βOX< 0.5 • (Jakobsson et al. 2004). Correction for host absorption assuming β(optical) ~0.6 (average for bright SWIFT events) • Ref: Cenko et al, in preparation 2008 Nanjing GRB MeetingSession 4

  11. - some preliminary results: the case of „dark” bursts Early period: optical to X –ray spectral index highly variable Later: became constant but below 0.5 => DARK burst • Ref: Cenko et al, in preparation 2008 Nanjing GRB MeetingSession 4

  12. - some preliminary results α Z 2008 Nanjing GRB MeetingSession 4

  13. - some preliminary results Color diagrams based on all 2005-2006-2007 P60 g, r, i, z, observations GRB OT 2008 Nanjing GRB MeetingSession 4

  14. - some preliminary results Color diagrams based on all 2005-2006-2007 P60 g, r, i, z, observations GRB OT Stars 2008 Nanjing GRB MeetingSession 4

  15. - some preliminary results Color diagrams based on all 2005-2006-2007 P60 g, r, i, z, observations GRB OT 2008 Nanjing GRB MeetingSession 4

  16. - some preliminary results Color diagrams based on all 2005-2006-2007 P60 g, r, i, z, observations GRB OTStars 2008 Nanjing GRB MeetingSession 4

  17. - What about the individual colors? Z values from http://www.mpe.mpg.de/~jcg/grbgen.html • Pseudo-redshift Calculatorfor G-Ray Bursts, A. Pélangeon & J-L. Atteia 2008 Nanjing GRB MeetingSession 4

  18. - some preliminary results • What about the individual colors? 0 < Z < 2.5 2008 Nanjing GRB MeetingSession 4

  19. - some preliminary results • (grb060206: 4.048; grb060210: 3.91; grb060906:3.686) 2008 Nanjing GRB MeetingSession 4

  20. - some preliminary results • why the big scatter? What about the individual colors? offset at high Z 2008 Nanjing GRB MeetingSession 4

  21. - some preliminary results • High redshift bump ?? 2008 Nanjing GRB MeetingSession 4

  22. - some preliminary results • High redshift bump • synthetic colors based on polinomial regression • of the redshift – magnitude(1Day) diagrams 2008 Nanjing GRB MeetingSession 4

  23. - some preliminary results • synthetic colors based on polinomial regression • (similar structure) 2008 Nanjing GRB MeetingSession 4

  24. - some preliminary results • synthetic colors based on polinomial regression • (similar structure) 2008 Nanjing GRB MeetingSession 4

  25. - conclusions 2008 Nanjing GRB MeetingSession 4

  26. - conclusions • the case of the „dark” bursts 2008 Nanjing GRB MeetingSession 4

  27. - conclusions • the case of the „dark” bursts • P60 80 % detection efficiency P60 was able to detect optical afterglow emissionfrom a large fraction (∼ 80%) of events for which observationsbegan within an hour of theburst trigger. 2008 Nanjing GRB MeetingSession 4

  28. - conclusions • the case of the „dark” bursts • P60 80 % detection efficiency • strange color-color diagrams 2008 Nanjing GRB MeetingSession 4

  29. - conclusions • the case of the „dark” bursts • P60 80 % detection efficiency • strange color-color diagrams • further GRBs needed 2008 Nanjing GRB MeetingSession 4

  30. - conclusions • the case of the „dark” bursts • P60 80 % detection efficiency • strange color-color diagrams • further GRBs needed COMING SOON !!! ADVERTISEMENT 2008 Nanjing GRB MeetingSession 4

  31. - conclusions • the case of the „dark” bursts • P60 80 % detection efficiency • strange color-color diagrams • further GRBs needed ... Now this is not the end. It is not even the beginning of the end. But it is, perhaps, the end of the beginning... Sir Winston Churchill, Speech in November 1942 2008 Nanjing GRB MeetingSession 4

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