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A DARK ENERGY CAMERA SEARCH FOR AN OPTICAL COUNTERPART TO THE FIRST ADVANCED LIGO GRAVITATIONAL WAVE EVENT GW150914

  • Authors: M. Soares-Santos, R. Kessler, E. Berger, J. Annis, D. Brout, E. Buckley-Geer, H. Chen, P. S. Cowperthwaite, H. T. Diehl, Z. Doctor, A. Drlica-Wagner, B. Farr, D. A. Finley, B. Flaugher, R. J. Foley, J. Frieman, R. A. Gruendl, K. Herner, D. Holz, H. Lin, J. Marriner, E. Neilsen, A. Rest, M. Sako, D. Scolnic, F. Sobreira, A. R. Walker, W. Wester, B. Yanny, T. M. C. Abbott, F. B. Abdalla, S. Allam, R. Armstrong, M. Banerji, A. Benoit-Lévy, R. A. Bernstein, E. Bertin, D. A. Brown, D. L. Burke, D. Capozzi, A. Carnero Rosell, M. Carrasco Kind, J. Carretero, F. J. Castander, S. B. Cenko, R. Chornock, M. Crocce, C. B. D'Andrea, L. N. da Costa, S. Desai, J. P. Dietrich, M. R. Drout, T. F. Eifler, J. Estrada, A. E. Evrard, S. Fairhurst, E. Fernandez, J. Fischer, W. Fong, P. Fosalba, D. B. Fox, C. L. Fryer, J. Garcia-Bellido, E. Gaztanaga, D. W. Gerdes, D. A. Goldstein, D. Gruen, G. Gutierrez, K. Honscheid, D. J. James, I. Karliner, D. Kasen, S. Kent, N. Kuropatkin, K. Kuehn, O. Lahav, T. S. Li, M. Lima, M. A. G. Maia, R. Margutti, P. Martini, T. Matheson, R. G. McMahon, B. D. Metzger, C. J. Miller, R. Miquel, J. J. Mohr, R. C. Nichol, B. Nord, R. Ogando, J. Peoples, A. A. Plazas, E. Quataert, A. K. Romer, A. Roodman, E. S. Rykoff, E. Sanchez, V. Scarpine, R. Schindler, M. Schubnell, I. Sevilla-Noarbe, E. Sheldon, M. Smith, N. Smith, R. C. Smith, A. Stebbins, P. J. Sutton, M. E. C. Swanson, G. Tarle, J. Thaler, R. C. Thomas, D. L. Tucker, V. Vikram, R. H. Wechsler, and J. Weller

2016 The Astrophysical Journal Letters 823 L33.

  • Provider: AAS Journals

Caption: Figure 1.

The color image shows the estimated limiting point-source magnitude for a 90 s i band exposure as a function of sky position for our first night of DECam observations just before sunrise. In this area and for this time of night, the variations are mostly due to interstellar dust extinction. The dotted contours show the initial (2015 September) skyprobcc_cWB_complete map, while the solid contours are for the final (2016 January) LALInference_skymap. There is an island of significant probability in the Northern hemisphere in the skyprobcc_cWB_complete map that is not present in the LALInference_skymap, so the dotted contours do not show the complete 50% or 90% areas. The hexagonal DECam fields observed are shown, with red for the main search and orange for the short exposure LMC data. Fields located on the west (left) side of the region of interest overlap with the DES area (footprint boundary shown in light-gold). The excluded region (dark gray) is beyond the horizon limit that could be observed with DECam at that time. The total area inside the camera pointings is about 102 deg2. We covered about 11% of the total localization probability in the final map, and 38% of the initial map. The projection shown is an equal-area McBryde-Thomas flat-polar quartic projection.

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