Online material

Appendix A: SED data and plots

	Fig. A.1 SED plots.
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For each host galaxy we report the data used with a short description of the newly obtained ones. The SED fitting plots and results for each host galaxy are reported in Fig. A.1 and Table A.1, respectively.

Appendix A.1: GRB 050416A host

To build the SED of this host we used the public TNG/DOLORES J-band data¹²; programme ID: A22_TAC107 PI: D. Malesani and the photometry published by Soderberg et al. (2007), Perley et al. (2009), Hjorth et al. (2012).

Appendix A.2: GRB 050525A host

To build the SED of this host, we obtained GTC/OSIRIS data with the gi filters (programme ID: GTC31-13B PI: A. Fernandez-Soto), and we used the R and K-band photometry published by Hjorth et al. (2012), as well as the public Spitzer IRAC1and IRAC2 data obtained under programme ID: 3653, PI: P.M. Garnavich. The GTC/OSIRIS observations were obtained on the October 23, 2013 for a total exposure of 6 × 300 s and 15 × 160 s in g and i bands, respectively.

Appendix A.3: GRB 060614 host

To build the SED of this host, we used the photometry published by Della Valle et al. (2006), Mangano et al. (2007), Hjorth et al. (2012) and the public Spitzer IRAC1 data obtained under programme ID: 90062, PI: D. A. Perley.

Appendix A.4: GRB 060912A host

To build the SED of this host, we used the public TNG/DOLORES UBVIJ-band data¹³; program ID: A22_TAC107 PI: D. Malesani, the R and K-band photometry published by Hjorth et al. (2012), and the public Spitzer IRAC1 data obtained under programme ID: 90062, PI: D. A. Perley.

Appendix A.5: GRB 061021 host

To build the SED of this host, we obtained VLT/HAWK-I photometry (ID 092.D-0305, PI: S. D. Vergani). We also used the public TNG/DOLORES B and V-band data¹⁴; program ID: A22_TAC107 PI: D. Malesani, the public Spitzer IRAC1 data obtained under programme ID: 90062, PI: D. A. Perley, and the R-band photometry published by Hjorth et al. (2012).

VLT/HAWK-I observations were taken between December 28, 2013 and January 7, 2014 for a total of 30 min (15 × 120 s) in J-band and 80 min (40 × 120 s) in K-band.

Appendix A.6: GRB 071112C host

To build the SED of this host we obtained GTC/OSIRIS data with the z filter (programme ID: GTC31-13B PI: A. Fernandez-Soto). We also used R-band Gemini public data (programme ID: GN-2008B-Q-112 PI: A. Levan), TNG/DOLORES I-band data (programme ID: A17_TAC9 PI:C. Guidorzi), HST F160W data (programme ID: GN-2008B-Q-112 PI: A. Levan), and the public Spitzer IRAC1 data obtained under programme ID: 90062, PI: D. A. Perley.

The GTC/OSIRIS observations were obtained on February 1, 2014 under clear sky conditions for a total exposure of 21 × 100 s in z-band.

Appendix A.7: GRB0 80319B host

To build the SED of this host we used the photometry published by Tanvir et al. (2010).

Appendix A.8: GRB 080430 host

To build the SED of this host, we obtained TNG/DOLORES photometry with the g,i,z filters under the OPTICON (Optical Infrared Co-ordination Network for astronomy) programme OPT13B_71 (PI S. D. Vergani). We also used the r-band Keck LRIS photometry kindly made available by D. A. Perley in his preliminary LGRB hosts catalogue¹⁵, the HST F160W data (programme ID: GN-2008B-Q-112 PI: A. Levan), as well as the public Spitzer IRAC1 data obtained under programme ID: 90062, PI: D. A. Perley.

The TNG observations were obtained on January 28, 2014 and February 1, 2014 for a total of 8250 s, 6900 s, and 9630 s, in the g,i,z filters, respectively.

Appendix A.9: GRB 080916A host

To build the SED of this host, we obtained VLT/HAWK-I photometry (ID 092.D-0305, PI: S. D. Vergani), we used photometry obtained by the GROND (see 2.1), the HST F160W data (programme ID: GN-2008B-Q-112 PI: A. Levan), and the public Spitzer IRAC1 data obtained under programme ID: 90062, PI: D. A. Perley.

The K,J-band VLT/HAWK-I observations started on November 10 and 13, 2013, respectively, under excellent seeing conditions. We obtained a total of 26 min (13 × 120 s) in the J-band and 25 min (15 × 100 s) in the Ks-band. GROND observations started on December 21, 2008. The integration of the individual 12 griz and 360 JHK images is of 369 s and 10 s, respectively.

Appendix A.10: GRB 081007 host

To build the SED of this host, we used VLT/HAWK-I photometry (ID 092.A-0231, PI: T. Krühler), GROND photometry (see Sect. 2.1), the HST F160W data (programme ID: GN-2008B-Q-112 PI: A. Levan), the photometry published in Jin et al. (2013) and the public Spitzer IRAC1 data obtained under programme ID: 80153, PI: D. A. Perley.

The HST images reveal two objects: one falling in the UVOT afterglow error circle and another separated by less than 1′′ (<6.3 kpc). Those are not resolved by the other instruments used, and together they extend over ~1.5″. Even if it is not certain, in this paper we considered them as forming a single system.

VLT/HAWK-I observations started on October 13, 2013 for a total of 18 min (36 × 30 s) in J-band and 28 min (168 × 10 s) in K-band. GROND observations started on December 22, 2011. The integration of the individual 12 griz and 360 JHK images is 375 s and 10 s, respectively.

Appendix A.11: GRB 090924 host

To build the SED of this host, we used the photometry published in Jin et al. (2013), that available from the SDSS¹⁶ and the public Spitzer IRAC1 data obtained under programme ID: 90062, PI: D. A. Perley.

Appendix A.12: GRB 091018 host

To build the SED of this host, we obtained VLT/HAWK-I photometry (ID 092.D-0305, PI: S. D. Vergani), we used the photometry obtained by the GROND (see Sect. 2.1) and the public Spitzer IRAC1 data obtained under programme ID: 90062, PI: D. A. Perley.

VLT/HAWK-I observations started on November 13, 2013 under excellent seeing conditions for a total of 40 min

(20 × 120 s) in K-band. GROND observations started on August 30, 2011. The integration of the individual 16 griz and 480 JHK images is 375 s and 10 s, respectively.

Appendix A.13: GRB 091127 host

To build the SED of this host, we used the photometry published in Vergani et al. (2011) and the public Spitzer IRAC1 data obtained under programme ID: 90062, PI: D. A. Perley.

Appendix A.14: GRB 100621A host

To build the SED of this host, we used the photometry published in Krühler et al. (2011) and the public Spitzer IRAC1and IRAC2 data obtained under programme ID: 70036, PI: D. A. Perley.

© ESO, 2015