README for MOA-2013-BLG-220

Name of Microlensing event : MOA-2013-BLG-220 (MB13220)

Discovery paper : Yee et al 2014, ApJ 790, 14
Keck Follow-up paper : Vandorou et al 2020, AJ, in press, (arXiv:1909.04444)

RA Dec = 18:03:56.50 -29:32:41.0, J2000.0

files: 
KWMB13220Ks.fits      Wide camera stack of 22 images from 2015 in Ks band  FWHM 50-60 mas
KNMB13220Ks.fits      Narrow camera stack of 21 image from 2019 in Ks band FWHM 100 mas
VVV_VKB130220J.fits   J-band image from VVV survey centered on event
VVV_VKB130220H.fits   H-band image from VVV survey centered on event
VVV_VKB130220Ks.fits  Ks-band image from VVV survey centered on event
VVV_KMB13220JHK.tst   2MASS calibrated, JHKs band PSF fitting photometry of VVV images
                         (Used for calibration of Keck narrow camera image photometry)
phot_export_MB13220.tar.gz  light curve photometry used in analysis
README_MB13220        this file

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Keck Narrow 
Source star: K_S = 17.20 +- 0.02
x_S:     609.540 +- 0.029
y_S:     637.006 +- 0.031
Lens star:   K_L = 17.92 +- 0.02
x_L:     602.261 +- 0.029
y_L:     639.832 +- 0.031

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Target location from MOA difference image:
high resolution image (Keck NIRC2 Narrow Camera): mb13220_KWMB13220Ks.fits
light curve reference image (MOA-II image):       mb13220_B1447-gb13-R-4.fit

Coordinates are defined with the first pixel as (0,0). Add 1 to each coordinate
to get the coordinate system used by ds9.

Transformation from Keck image to MOA image:
X_moa = 361.8475989821 + -0.0008463541 * X_keck + 0.0680430967 * Y_keck
Y_moa = 439.1344002918 + -0.0684771861 * X_keck + -0.0001016912 * Y_keck

Transformation from MOA image to Keck image:
X_keck =  6420.6356804087 + -0.0218245538 * X_moa + -14.6031340604 * Y_moa
Y_keck = -5238.0547760899 + 14.6962965708 * X_moa + -0.1816410920 * Y_moa

Keck image event position:
XCEN =     573.7512 +/-   0.2767
YCEN =     569.5419 +/-   0.5892

MOA image event position:
XCEN =     400.1154 +/-   0.0399
YCEN =     399.7876 +/-   0.0189
