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Home All issues Volume 507 / No 3 (December I 2009) A&A, 507 3 (2009) L45-L48 Full HTML
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Table 1:

Observation log for GRB 090426.

Mean time 		Exposure time Time since GRB  Seeing Instrument Magnitude1 Filter Comments
(UT) (s) (days) ( $^{\prime\prime}$)     Grism  
2009 Apr. 26.97190 $ 4 \times 120$ 0.43802 1.4 TNG/DOLORES $22.05 \pm 0.08$ B AG detection
2009 Apr. 26.97679 $ 2 \times 120$ 0.44291 1.4 TNG/DOLORES $21.69 \pm 0.07$ V AG detection
2009 Apr. 26.98818 $ 1 \times 180$ 0.45430 1.4 TNG/DOLORES $21.38 \pm 0.06$ R AG detection
2009 Apr. 26.99583 $ 1 \times 180$ 0.46195 1.4 TNG/DOLORES $21.25 \pm 0.09$ I AG detection
2009 Apr. 26.98457 $ 2 \times 1800$ 0.45069 1.4 TNG/DOLORES - LR-B AG spectra
2009 May 02.04516 $16 \times 120$ 5.51128 1.4 TNG/DOLORES $23.54 \pm 0.16$ R HG detection
2009 May 13.05282 $30 \times 180$ 16.51894 1.0 TNG/DOLORES $23.70 \pm 0.12$ R HG detection
2009 May 18.97929 $20 \times 180$ 22.44541 1.0 TNG/DOLORES > 24.0 I $3\sigma$ u.l.
2009 May 31.20833 $21\times 180$ 35.67445 0.9 LBT/LBC_blue $24.11 \pm 0.10$ g' HG + knot
2009 May 31.21875 $17\times 180$ 35.68487 1.1 LBT/LBC_blue $23.83 \pm 0.13$ r' HG + knot
2009 May 31.20833 $16\times 180$ 35.67445 0.7 LBT/LBC_red $24.06 \pm 0.18$ i' HG + knot
2009 May 31.21875 $12\times 180$ 35.68487 0.8 LBT/LBC_red $23.32 \pm 0.15$ z' HG + knot
2009 May 31.20833 $21\times 180$ 35.67445 0.9 LBT/LBC_blue $24.70 \pm 0.10$ g' HG
2009 May 31.21875 $17\times 180$ 35.68487 1.1 LBT/LBC_blue $23.86 \pm 0.07$ r' HG
2009 May 31.20833 $16\times 180$ 35.67445 0.7 LBT/LBC_red $24.15 \pm 0.13$ i' HG
2009 May 31.21875 $12\times 180$ 35.68487 0.8 LBT/LBC_red $23.73 \pm 0.13$ z' HG
2009 May 31.20833 $21\times 180$ 35.67445 0.9 LBT/LBC_blue $25.46 \pm 0.20$ g' N-E knot
2009 May 31.21875 $17\times 180$ 35.68487 1.1 LBT/LBC_blue $24.72 \pm 0.15$ r' N-E knot
2009 May 31.20833 $16\times 180$ 35.67445 0.7 LBT/LBC_red $25.53 \pm 0.32$ i' N-E knot
2009 May 31.21875 $12\times 180$ 35.68487 0.8 LBT/LBC_red $24.87 \pm 0.29$ z' N-E knot

1 Magnitudes are in the AB system and are not corrected for Galactic extinction ( E(B-V)= 0.02 mag Schegel et al. 1998). Point spread function (PSF) and aperture photometry were performed, on both the afterglow and the host galaxy respectively, by using the Daophot II within the ESO-MIDAS package, the task Phot/Apphot within the IRAF package and the SExtractor package (Bertin & Arnouts 1996). In particular, an aperture radius of 2.2'' was adopted to cover the entire extended object observed in the LBT images. The calibration of TNG data was performed using Landolt standard stars. The calibration of LBT was done against the SLOAN catalogue. Errors and upper limits are given at $1\sigma$ confidence level.

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