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.
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.
Reference.
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