Photometric redshifts for gamma-ray burst afterglows from GROND and Swift/UVOT

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Table 2

GROND photometric measurements of GRB afterglows in the photo-z sample.

GRB	Δt	g′^a	r′	i′	z′	J	H	K _S	Calibration^b

	[h]	[mag_AB]	[mag_AB]	[mag_AB]	[mag_AB]	[mag_Vega]	[mag_Vega]	[mag_Vega]

080825B	7.20	22.45 ± 0.07	19.91 ± 0.04	18.62 ± 0.04	18.24 ± 0.04	16.83 ± 0.04	16.03 ± 0.05	15.30 ± 0.05	SA103-626/2M
080906	10.9	22.11 ± 0.07	21.72 ± 0.05	21.49 ± 0.06	21.37 ± 0.07	20.18 ± 0.16	19.55 ± 0.23	18.75 ± 0.32	SDSS/2M
081228	0.719	22.10 ± 0.14	20.79 ± 0.04	20.30 ± 0.05	20.12 ± 0.08	18.64 ± 0.14	17.63 ± 0.14	16.87 ± 0.15	SDSS/2M
081230	5.44	21.62 ± 0.04	21.16 ± 0.03	20.98 ± 0.04	19.75 ± 0.04	19.62 ± 0.05	18.99 ± 0.06	18.50 ± 0.14	SA94-242/2M
090530	21.8	22.15 ± 0.14	22.08 ± 0.10	21.78 ± 0.14	21.64 ± 0.18	>20.33	>19.50	>18.74	SDSS/2M

Notes.

^(a)

All magnitudes are observed magnitudes, i.e. uncorrected for the corresponding Galactic foreground reddening.

^(b)

Calibration source for the data. All magnitudes from SA standard stars and fields are taken from the primary Sloan standard star network (Smith et al. 2002). 2M and SDSS denote a calibration against stars from the 2MASS catalog (Skrutskie et al. 2006) in case of J, H, and K_S measurements, and the SDSS DR7 (Abazajian et al. 2009) for g′, r′, i′, z′ band data.

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