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Table 1

Optical observations of the field of GRB 130912A.

Telescope Data start Observation time after trigger Filtera Magnitudeb Flux
(UT) (s) (erg cm-2 s-1 Hz-1)

GROND 08:50/12/09/2013 960 GROND r 22.0 ± 0.20(1) 5.75 × 10-29
P60 08:58/12/09/2013 1380 GROND r 21.77 ± 0.20(2) 7.11 × 10-29
P60 09:28/12/09/2013 3180 GROND r 22.09 ± 0.25(2) 5.29 × 10-29
RATIR 07:33/13/09/2013 ~ 8.1 × 104 SDSS r >23.89(3) < 1.01 × 10-29

Notes.

(a)

The difference between GROND r and SDSS r is less than 0.04 mag assuming a power-law spectrum with an index β between 1 and −2. Here the flux of the afterglow is expressed as Fνtανβ;

(b)

the flux is reported with the 1σ statistical error, and the upper limit is at the confidence level of 3σ.

Reference.

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