The long-lasting optical afterglow plateau of short burst GRB 130912A

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Table 1

Optical observations of the field of GRB 130912A.

Telescope	Data start	Observation time after trigger	Filter^a	Magnitude^b	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 F_ν ∝ t^αν^β;

^(b)

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

Reference.

⁽¹⁾

Tanga et al. (2013),

⁽²⁾

Cenko et al. (2013),

⁽³⁾

Butler et al. (2013).

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