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Table C.1.

Reference stars for GROND and X-shooter photometry.

RA Dec (J2000) g′ r′ i′ z′
253.5730 −54.0389 16.728 (1) 16.027 (1) 15.750 (1) 15.559 (1)
253.5714 −54.0442 17.200 (2) 16.635 (1) 16.410 (2) 16.260 (2)
253.5738 −54.0550 17.425 (2) 16.758 (1) 16.518 (2) 16.355 (2)
253.5807 −54.0370 18.022 (3) 17.331 (2) 17.076 (3) 16.903 (5)
253.5661 −54.0404 18.072 (5) 17.466 (3) 17.220 (6) 17.044 (6)
253.5681 −54.0489 18.277 (3) 17.558 (2) 17.225 (3) 17.014 (3)
253.5900 −54.0397 18.326 (5) 17.571 (2) 17.278 (5) 17.078 (5)
253.5509 −54.0445 18.321 (5) 17.582 (2) 17.282 (3) 17.077 (5)
253.5566 −54.0514 18.449 (5) 17.801 (2) 17.550 (5) 17.392 (5)
253.5591 −54.0291 18.563 (7) 17.851 (5) 17.542 (6) 17.340 (7)
253.5573 −54.0339 18.958 (8) 18.014 (3) 17.635 (5) 17.397 (6)
253.5641 −54.0485 18.901 (6) 18.114 (3) 17.825 (6)
253.5727 −54.0487 18.853 (6) 18.173 (5) 17.888 (7)
253.5641 −54.0506 19.125 (8) 18.311 (5) 17.924 (7)
253.5662 −54.0461 19.323 (8) 18.638 (5) 18.329 (8)
253.5536 −54.0400 19.522 (9) 18.699 (6) 18.387 (9)
253.5591 −54.0473 19.584 (9) 18.856 (7)
253.5602 −54.0376 19.243 (7)
253.5779 −54.0431 19.466 (9)

Notes. AB magnitudes obtained using a 2 × FWHM aperture. They have been obtained using zeropoints calibrated via the observations of the STD17 SDSS field. Numbers in parentheses give the photometric 1σ statistical uncertainty of the secondary standards in units of milli-mag.

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