GCN Circular 2141
Subject
GRB030329: VR Photometry at TNG
Date
2003-04-16T12:33:51Z (22 years ago)
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), A. Buzzoni, S. Di Tomaso, D. Fugazza,
F. Ghinassi, J.C. Guerra (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."
[GCN OPS NOTE (07Nov03): The INAF-TNG author list was changed from
"F. Ghinassi, D. Fugazza, S. Di Tomaso (INAF-TNG)" to
"A. Buzzoni, S. Di Tomaso, D. Fugazza, F. Ghinassi, J.C. Guerra (INAF-TNG)".]