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GCN Circular 3142

Subject
GRB050319, optical observations
Date
2005-03-25T18:14:38Z (20 years ago)
From
Adalberto Piccioni at Astronomy, Bologna U. <piccioni@ermione.bo.astro.it>
G. Greco, C. Bartolini, A. Guarnieri, A. Piccioni (Bologna University),
P. Ferrero (Osservatorio e Universita' di Teramo), G. Pizzichini (IASF-CNR,
Sezione di Bologna)  and I. Bruni (Osservatorio di Bologna) report:

We observed the error box of GRB050319 (SWIFT trigger 11162; Krimm et al.,
GCN 3117Loading...
 
 ) in Rc light on March 20 in good sky conditions (seeing approx.
1.5 - 2 arcsec) but in presence of high contribution of moonlight with
the 152 cm G.D. Cassini telescope of Bologna University, equipped with the
BFOSC CCD imager.
We got 4X1200s images with the following results: 
UT at start exposure        Exposure (s)       OT Rc mag        
2005 March 20, 2:14           1200               19.58 (+- 0.18)
2005 March 20, 2:37           1200               19.66 (+- 0.16)
2005 March 20, 3:02           1200               19.67 (+- 0.16)
 2005 March 20  3:25          1200               19.69 (+- 0.19)
obtained using as comparisons the following objects extracted from
the USNO A2 catalog:
                                     ID: 1275-07685084
                                     ID: 1275-07684473
                                     ID: 1275-07683651
                                     ID: 1275-07685059
                                     ID: 1275-07684793
                                     ID: 1275-07685268
                                     ID: 1275-07684751
 From our images, by comparison with the R magnitudes reported by CGN 3124,
3139 and 3140 we infer a substantial rebrightening. An image of the OT 
is posted
into a public directory from where it can be retrieved by sftp using
hostname: ermione.bo.astro.it,  username: publicGRB,  password: GRB_bo and
directory: GRB050319.