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GCN Circular 2663

Subject
GRB040825B: optical observations
Date
2004-08-26T04:38:55Z (20 years ago)
From
Adalberto Piccioni at Astronomy, Bologna U. <piccioni@ermione.bo.astro.it>
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A. Piccioni, C. Bartolini, A. Guarnieri, G. Greco (Bologna University),
P. Ferrero (IASF-CNR, Bologna; Osservatorio e Universita' di Teramo),
G. Pizzichini (IASF-CNR, Sezione di Bologna), F. Giovannelli (IASF-CNR,
Sezione di Roma) and R. Gualandi (Osservatorio di Bologna) report:

We observed the error box of GRB040825B (HETE trigger 3510, GCN 2662,
Urata et al.) with the 152 cm Loiano Telescope and the BFOSC camera
system on August 25, in non optimal sky conditions (seeing ~3.5 arcsec).

The field has been divided in two subfields centered at the coordinates:

22hh 46mm 40ss; -2deg 21arcmin 42arcsec and approximately 22hh 46mm
38ss;
-2deg 28arcmin, respectively.
We got 5X300s images with Rc filter of each subfield at mean UT 25.96076

and 25.99013, respectively.
The magnitude limit, estimated by aperture photometry, is approximately
19.5.
By comparison of the coadded images with the corresponding DSS-2 field
we do not find any obvious OT source in agreement with Price and
McNaugth, (GCN 2657), whose limit was deeper and at an earlier epoch.
The coadded images and the observation log will be posted into a public
directory from where it will be possible to retrieve by sftp using the
hostname: ermione.bo.astro.it, username: publicGRB, password: GRB_bo
and directory: GRB040825B.

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