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|
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 Fν ∝ tανβ;
the flux is reported with the 1σ statistical error, and the upper limit is at the confidence level of 3σ.
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