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Table 1

Summary of photometric and spectroscopic data.

Photometry a Spectroscopy b
Instrument Filter Exposure Seeing Photo- Instrument Grating Spectral Resolving Exposure Slit Position Seeing Photo-
time (s) metric? range (Å) power time (s) width angle metric?
GRB 050730: RA = , Dec = (J2000)
VLT/FORS2 R 8 × 250 + 24 × 300 06 yes VLT/FORS1 600V+GG435 4430–7370 990 5 × 1316 13 225 08 yes
HST/ACS F775W 6 × 1307 VLT/FORS2 600B 3300–6210 780 4 × 1316 13 –200 09 yes
VLT/ISAAC K s 32 × 60 07 yes 300V 3400–9500 440 600 + 1200 10 00 15 no
Spitzer/IRAC 3.6   &   5.8   μm 7200 600B 3300–6210 780 5 × 1316 13 335 12 yes
600B 3300–6210 780 4 × 1316 13 950 13 yes
VLT/UVES 346 and 580 3030–6840c  ~ 40   000 3000 10 00 18 no
437 and 860 3730–10 600d 11 yes
VLT/X-shootere UVB 3000–5500 4000 2 × 900 13 437 08 yes
VIS 5500–10 000 6700 2 × 900 12
NIR 10 000–25 000 4000 6 × 300 12
GRB 050820A: RA = , Dec = (J2000)
Keck/LRIS g 2620 07 yes VLT/FORS2 300V 3400–9500 440 4 × 1316 13 –520 12 yes
HST/ACS F625W 2238 300V 8 × 1316 13 340 13 yes
VLT/FORS2 R 4 × 500 08 no 300V 4 × 1316 13 830 07 yes
HST/ACS F775W 4404 1028z+OG590 7730–9480 2560 2 × 1316 13 –520 08 yes
HST/ACS F850LP 14 280 1028z+OG590 4 × 1316 13 340 12 yes
Magellan/PANIC H 8460 06 1028z+OG590 2 × 1316 13 830 07 yes
VLT/ISAAC K s 32 × 60 07 yes VLT/UVES 390 and 564 3260–6680f  ~40 000 1800+1815 10 00 10 yes
Spitzer/IRAC 3.6   &   5.8   μm 3600 437 and 860 3730–10 600d 2430
GRB 050908: RA = , Dec = (J2000)
VLT/FORS2 R 12 × 500 07 yes Gemini/GMOS-N B600+G0305 5118–7882 844 2 × 1200 075 1100
VLT/ISAAC K s 32 × 60 06 yes VLT/FORS1 300V 3400–9500 440 3 × 1200 10 00 06 yes
Spitzer/IRAC 3.6   &   5.8   μm 7200 600B 3300–6210 780 6 × 1345 13 538 12 yes
GRB 070721B: RA = , Dec =  −02°11′4080 (J2000)
VLT/FORS2 R 24 × 235 05 no VLT/FORS1 300V 3400–9500 440 5 × 2735 13 –1185 12 yes
HST/ACS F775W 6 × 1307 VLT/FORS2 300V 3400–9500 440 4 × 1800 10 –1183 12 yes
Magellan/PANIC H 10 320 05
VLT/ISAAC K s 32 × 60 10 yes

Notes. Co-ordinates were taken from Malesani et al. (in prep.) Photometry: observing conditions of Keck and Magellan data are quoted from Chen et al. (2009). Column “Photometric?” states if observing conditions were photometric. Spectroscopy: observing conditions of the afterglow spectroscopy campaigns, and the VLT/UVES data of GRB 050730 and of GRB 050820A are taken from Fynbo et al. (2009), Ledoux et al. (2009), and Vergani et al. (2009). The VLT/UVES and VLT/X-shooter spectrographs consist of two and three arms, respectively, displayed in the column “Grating”. Observations in the different arms are carried out simultaneously. Resolving power of VLT/FORS1+2 and Gemini grisms are given for a slit width of 1″. The stated resolving power of the X-shooter NIR spectrum was decreased during the data reduction to increase S/N. The effective resolving power of the X-shooter NIR arm is around ten times lower.

(a)

Date of observations. GRB 050730: VLT/FORS2 – 2006/03/04 – 05/25, HST/ACS – 2010/06/10, VLT/ISAAC – 2006/03/20, Spitzer/IRAC: 2008/03/11; GRB 050820A: Keck/LRIS – July 2006, HST/ACS – F625W, F775W, F850LP: 2005/09/26 and 2006/06/05-11, Magellan/PANIC: August 2007, VLT/FORS2 – 2006/05/24, VLT/ISAAC – 2006/05/20, Spitzer: 2007/12/23; GRB 050908: VLT/FORS2 – 2007/07/21-08/14, VLT/ISAAC – 2007/07/11, Spitzer/IRAC: 2008/08/18; GRB 070721B: VLT/FORS2 – 2007/10/04-11/13, HST/ACS – 2010/11/13, Magellan/PANIC – August 2007, VLT/ISAAC – 2007/09/22.

(b)

Date of observations. GRB 050730: VLT/FORS1 600V+GG435 – 2007/02/23-24, VLT/FORS2 600B – : 2006/06/22, : 2005/07/31, : 2006/04/28-05/28, : 2006/05/28, VLT/UVES: 2005/07/31, VLT/X-shooter: 2010/04/18; GRB 050820A: VLT/FORS2 300V – : 2006/07/22-08/16, : 2006/08/31-09/22, : 2006/08/17-09/15, 1028z – : 2006/08/16, : 2006/09/17-22, : 2006/08/17, VLT/UVES: 2005/08/20; GRB 050908: Gemini/GMOS-N – 2005/09/08, VLT/FORS1 – 300V: 2005/09/08, 600B: 2007/08/16-09/06; GRB 070721B: VLT/FORS1 – 2007/11/16-12/04, VLT/FORS2 – 2007/07/22.

(c)

Spectral range of the blue and red arms are 3030–3880 Å and 4760–6840 Å, respectively.

(d)

Spectral range of the blue and red arms are 3730–4990 Å and 6600–10 600 Å, respectively.

(e)

The target of the X-shooter observation was QSO J1408-0346.

(f)

Spectral range of the blue and red arms are 3260–4450 Å and 4580–6680 Å, respectively.

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