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This article has an erratum: [https://doi.org/10.1051/0004-6361/201525810e]


Table 1

TIGRE spectra.

Date [days] JD start-exp Exp.time S/N Vmag
(2 400 000+) (s) (blue;red)

2013-08-17 [3] 56 521.787 4260 215; 352 4.8
2013-08-19 [5] 56 523.786 5400 334; 669 4.9
2013-08-20 [6] 56 524.755 4920 286; 586 5.1

2013-08-29 [15] 56 533.774 1350 84; 177 6.7
2013-08-30 [16] 56 534.778 1890 92; 188 6.8
2013-09-01 [18] 56 536.742 660 71; 143 7.1
2013-09-02 [19] 56 537.837 1890 64; 137 7.2
2013-09-03 [20] 56 538.837 1050 29; 66 7.3
2013-09-11 [28] 56 546.785 560 37; 79 7.7

2013-09-25 [42] 56 560.735 1980 43; 88 8.4
2013-09-30 [47] 56 565.691 180 10; 21 9.0
2013-10-03 [50] 56 568.668 540 17; 33 9.4
2013-10-08 [55] 56 573.712 1440 12; 24 10.0
2013-10-14 [61] 56 579.584 1800 16; 28 10.7
2013-10-25 [72] 56 590.682 1800 8; 14 11.1

2013-12-14 [121] 56 640.550 1800 8; 26 11.2

Notes. Horizontal lines separate the different characteristic phases introduced in Sect. 3. We provide the observation dates as calendar dates and Julian dates, give the number of days since the discovery, the exposure time, typical S/N values, and the visual magnitude at the time of observation.

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