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TITLE: GCN GRB OBSERVATION REPORT NUMBER: 2141 SUBJECT: GRB030329: VR Photometry at TNG DATE: 03/04/16 12:33:51 GMT FROM: Angelo Antonelli at Obs. Astro. di Roma <angelo@coma.mporzio.astro.it> V. Testa, G. Cocozza, A. Melandri, L.A. Antonelli (INAF-Roma, I), D. Malesani (SISSA, Trieste, I), F. Ghinassi, D. Fugazza, S. Di Tomaso (INAF-TNG), S. Covino (INAF-Merate, I), N. Masetti (IASF-CNR, Bologna, I), E. Pian (INAF-Trieste, I) on behalf of a larger Italian collaboration, report: "We have obtained VR images of the afterglow (Peterson & Price, GCN 1985) of GRB 030329 (Vanderspek et al., GCN 1997), with the Italian 3.6m TNG equipped with DOLORES. Observations were performed on Apr. 10,11 and 14; seeing in the R band was 1.0 arcsec during the first night, 1.2 arcsec during the second night, and 1.3 arcsec during the last night. The afterglow was detected in both bands with S/N(R,peak) = 43 (first night), 37 (second night) and 23 (third night). During the second and third nights measurements have been affected by a bright sky background, likely due to the moon being relatively close to the target (21 and 24 degrees respectively). We measured the following VR magnitudes, with respect to the calibration performed by Henden (GCN 2082): Obs._date(UT) t_exp(s) Filt. Mag Err(Mag) ---------------------------------------------- 10/4 21:38:37 240 V 19.72 0.05 10/4 21:31:28 240 R 19.34 0.05 11/4 21:35:49 240 V 19.68 0.11 11/4 22:04:56 240 R 19.45 0.09 14/4 20:33:01 240 V 20.10 0.12 14/4 20:48:30 240 R 19.71 0.11 All TNG measurements are consistent with a continuosly fading transient. This message can be cited."
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