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    A DECAM SEARCH FOR AN OPTICAL COUNTERPART TO THE LIGO GRAVITATIONAL-WAVE EVENT GW151226

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    Cowperthwaite_2016_ApJL_826_L29.pdf
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    Author
    Cowperthwaite, P. S. cc
    Berger, E. cc
    Soares-Santos, M. cc
    Annis, J. cc
    Brout, D.
    Brown, D. A. cc
    Buckley-Geer, E.
    Cenko, S. B. cc
    Chen, H. Y. cc
    Chornock, R.
    Diehl, H. T.
    Doctor, Z.
    Drlica-Wagner, A.
    Drout, M. R.
    Farr, B.
    Finley, D. A.
    Foley, R. J.
    Fong, W.
    Fox, D. B.
    Frieman, J.
    Garcia-Bellido, J.
    Gill, M. S. S.
    Gruendl, R. A. cc
    Herner, K.
    Holz, D. E.
    Kasen, D.
    Kessler, R. cc
    Lin, H.
    Margutti, R.
    Marriner, J.
    Matheson, T.
    Metzger, B. D.
    Neilsen Jr., E. H.
    Quataert, E.
    Rest, A.
    Sako, M.
    Scolnic, D.
    Smith, N.
    Sobreira, F.
    Strampelli, G. M.
    Villar, V. A.
    Walker, A. R.
    Wester, W.
    Williams, P. K. G.
    Yanny, B.
    Abbott, T. M. C.
    Abdalla, F. B.
    Allam, S.
    Armstrong, R.
    Bechtol, K.
    Benoit-Lévy, A.
    Bertin, E.
    Brooks, D.
    Burke, D. L.
    Rosell, A. Carnero
    Kind, M. Carrasco
    Carretero, J.
    Castander, F. J.
    Cunha, C. E.
    D’Andrea, C. B.
    Costa, L. N. da
    Desai, S.
    Dietrich, J. P. cc
    Evrard, A. E.
    Neto, A. Fausti
    Fosalba, P.
    Gerdes, D. W.
    Giannantonio, T.
    Goldstein, D. A.
    Gruen, D.
    Gutierrez, G.
    Honscheid, K.
    James, D. J.
    Johnson, M. W. G.
    Johnson, M. D.
    Krause, E.
    Kuehn, K.
    Kuropatkin, N.
    Lima, M.
    Maia, M. A. G.
    Marshall, J. L.
    Menanteau, F.
    Miquel, R.
    Mohr, J. J.
    Nichol, R. C.
    Nord, B. cc
    Ogando, R.
    Plazas, A. A.
    Reil, K.
    Romer, A. K.
    Sanchez, E.
    Scarpine, V.
    Sevilla-Noarbe, I.
    Smith, R. C.
    Suchyta, E.
    Tarle, G.
    Thomas, D.
    Thomas, R. C.
    Tucker, D. L.
    Weller, J.
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    Affiliation
    Univ Arizona, Steward Observ
    Issue Date
    2016-07-29
    Keywords
    binaries: close
    catalogs
    gravitational waves
    stars: neutron
    surveys
    
    Metadata
    Show full item record
    Publisher
    IOP PUBLISHING LTD
    Citation
    A DECAM SEARCH FOR AN OPTICAL COUNTERPART TO THE LIGO GRAVITATIONAL-WAVE EVENT GW151226 2016, 826 (2):L29 The Astrophysical Journal
    Journal
    The Astrophysical Journal
    Rights
    © 2016. The American Astronomical Society. All rights reserved.
    Collection Information
    This item from the UA Faculty Publications collection is made available by the University of Arizona with support from the University of Arizona Libraries. If you have questions, please contact us at repository@u.library.arizona.edu.
    Abstract
    We report the results of a Dark Energy Camera optical follow-up of the gravitational-wave (GW) event GW151226, discovered by the Advanced Laser Interferometer Gravitational-wave Observatory detectors. Our observations cover 28.8 deg(2) of the localization region in the i and z bands (containing 3% of the BAYESTAR localization probability), starting 10 hr after the event was announced and spanning four epochs at 2-24 days after the GW detection. We achieve 5 sigma point-source limiting magnitudes of i approximate to 21.7 and z approximate to 21.5, with a scatter of 0.4 mag, in our difference images. Given the two-day delay, we search this area for a rapidly declining optical counterpart with greater than or similar to 3 sigma significance steady decline between the first and final observations. We recover four sources that pass our selection criteria, of which three are cataloged active galactic nuclei. The fourth source is offset by 5.8 arcsec from the center of a galaxy at a distance of 187 Mpc, exhibits a rapid decline by 0.5 mag over 4 days, and has a red color of i - z approximate to 0.3 mag. These properties could satisfy a set of cuts designed to identify kilonovae. However, this source was detected several times, starting 94 days prior to GW151226, in the Pan-STARRS Survey for Transients (dubbed as PS15cdi) and is therefore unrelated to the GW event. Given its long-term behavior, PS15cdi is likely a Type IIP supernova that transitioned out of its plateau phase during our observations, mimicking a kilonova-like behavior. We comment on the implications of this detection for contamination in future optical follow-up observations.
    ISSN
    2041-8213
    DOI
    10.3847/2041-8205/826/2/L29
    Version
    Final published version
    Sponsors
    NSF through the Graduate Research Fellowship Program [DGE1144152]; NSF [AST-1518052, AST-1138766]; Alfred P. Sloan Foundation; NSF CAREER [PHY-1151836]; Kavli Institute for Cosmological Physics at the University of Chicago through NSF [PHY-1125897]; FAS Division of Science, Research Computing Group at Harvard University; National Aeronautics and Space Administration; DOE; NSF (USA); MEC/MICINN/MINECO (Spain); STFC (UK); HEFCE (UK); MINECO [AYA2012-39559, ESP2013-48274, FPA2013-47986]; Centro de Excelencia Severo Ochoa [SEV-2012-0234]; ERC under the EU's 7th Framework Programme [ERC 240672, 291329, 306478]
    Additional Links
    http://stacks.iop.org/2041-8205/826/i=2/a=L29?key=crossref.b1421e0dd349cd03be6011f729ee1e56
    ae974a485f413a2113503eed53cd6c53
    10.3847/2041-8205/826/2/L29
    Scopus Count
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    UA Faculty Publications

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