J/A+A/556/A22        R-band light curves of RX J1131-1231        (Tewes+, 2013)
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COSMOGRAIL: the COSmological MOnitoring of GRAvItational Lenses.
XIII. Time delays and 9-yr optical monitoring of the lensed quasar RX J1131-1231
    Tewes M., Courbin F., Meylan G., Kochanek C.S., Eulaers E., Cantale N.,
    Mosquera A.M., Magain P., Van Winckel H., Sluse D., Cataldi G., Voros D,
    Dye S.
   <Astron. Astrophys. 556, A22 (2013)>
   =2013A&A...556A..22T
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ADC_Keywords: QSOs ; Gravitational lensing ; Photometry
Keywords: gravitational lensing: strong - cosmological parameters -
          quasars: individual: RX J1131-1231

Abstract:
    We present the results from nine years of optically monitoring the
    gravitationally lensed z_QSO_=0.658 quasar RX J1131-1231. The R-band
    light curves of the four individual images of the quasar were obtained
    using deconvolution photometry for a total of 707 epochs. Several
    sharp quasar variability features strongly constrain the time delays
    between the quasar images. Using three different numerical techniques,
    we measured these delays for all possible pairs of quasar images while
    always processing the four light curves simultaneously. For all three
    methods, the delays between the three close images A, B, and C are
    compatible with being 0, while we measured the delay of image D to be
    91 days, with a fractional uncertainty of 1.5% (1{sigma}), including
    systematic errors. Our analysis of random and systematic errors
    accounts in a realistic way for the observed quasar variability,
    fluctuating microlensing magnification over a broad range of temporal
    scales, noise properties, and seasonal gaps. Finally, we find that our
    time-delay measurement methods yield compatible results when applied
    to subsets of the data.

Description:
    We have been monitoring the quadruply lensed quasar RX J1131-1231
    since December 2003 with different telescopes in the R band
    (~600-720nm). The resulting R-band light curves of the quadruply
    lensed quasar RX J1131-1231, is displayed in Fig. 4 of the paper.

    The light curves are obtained using deconvolution photometry of images
    from 3 different telescopes (the ESO Euler 1.2m, the CTIO SMARTS 1.3m
    and the Mercator 1.2m), for a total of 707 epochs. Several sharp
    quasar variability features strongly constrain the time delays between
    the quasar images.

Objects:
    ------------------------------------------------------------------
       RA   (2000)   DE       Designation(s)
    ------------------------------------------------------------------
    11 31 52     -12 31 59    RX J1131-1231  = 1RXS J113151.6-123158
    ------------------------------------------------------------------

File Summary:
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 FileName   Lrecl  Records   Explanations
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ReadMe         80        .   This file
fig4.dat       86      707   R-band light curves of RX J1131-1231
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See also:
 J/A+A/391/481  : R-band photometry of SBS1520+530 (Burud+, 2002)
 J/A+A/433/757  : Optical polarization of 203 QSOs (Sluse+, 2005)
 J/AJ/132/999   : SDSS quasar lens search (Oguri+, 2006)
 J/A+A/488/481  : Time delays and H0 from WFI J2033-4723 (Vuissoz+, 2008)
 J/A+A/536/A53  : R-band light curves of HE 0435-1223 (Courbin+, 2011)
 J/A+A/528/A42  : VRi light curves of the lensed QSO HE 0435-1223 (Ricci+, 2011)
 J/A+A/553/A121 : 2 lensed quasars light curves (Eulaers+, 2013)

Byte-by-byte Description of file: fig4.dat
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   Bytes Format Units   Label     Explanations
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   1- 13  F13.5 d       HJD       Julian Date (heliocentric)
  15- 21  F7.5  mag     Amag      Relative magnitude of quasar image A
  23- 29  F7.5  mag   e_Amag      Magnitude uncertainty of quasar image A
  31- 37  F7.5  mag     Bmag      Relative magnitude of quasar image B
  39- 45  F7.5  mag   e_Bmag      Magnitude uncertainty of quasar image B
  47- 53  F7.5  mag     Cmag      Relative magnitude of quasar image C
  55- 61  F7.5  mag   e_Cmag      Magnitude uncertainty of quasar image C
  63- 69  F7.5  mag     Dmag      Relative magnitude of quasar image D
  71- 77  F7.5  mag   e_Dmag      Magnitude uncertainty of quasar image D
  79- 86  A8    ---     Tel       Telescope used: EulerC2, EulerCAM, Mercator
                                  or SMARTS (1)
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Note (1): Telescopes are:
   EulerC2 = 1.2m Swiss telescope at ESO/La Silla, Chile (before 2010-Sep)
  EulerCAM = 1.2m Swiss telescope at ESO/La Silla, Chile (after 2010-Sep)
   SMARTS  = 1.3m telescope at Las Campanas, Chile
  Mercator = 1.2m telescope at La Palma Island
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Acknowledgements:
    Malte Tewes, malte.tewes(at)epfl.ch

References:
    Eigenbrod et al., Paper I     2005A&A...436...25E
    Eigenbrod et al., Paper II    2006A&A...451..747E
    Eigenbrod et al., Paper III   2006A&A...451..759E
    Saha et al.,      Paper IV    2006A&A...450..461S
    Vuissoz et al.,   Paper V     2007A&A...464..845V
    Eigenbrod et al., Paper VI    2007A&A...465...51E
    Vuissoz et al.,   Paper VII   2008A&A...488..481V, Cat. J/A+A/488/481
    Chantry et al.,   Paper VIII  2010A&A...522A..95C
    Courbin et al.,   Paper IX    2011A&A...536A..53C, Cat. J/A+A/536/A53
    Sluse et al.,     Paper X     2012A&A...538A..99S
    Tewes et al.,     Paper XI    2013A&A...553A.120T
    Eulaers et al.,   Paper XII   2013A&A...553A.121E, Cat. J/A+A/553/A121

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(End)       Malte Tewes [EPFL, Switzerland], Patricia Vannier [CDS]  18-Jun-2013
