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Hi Francisco,
I'll have a look at your images on Tuesday and will comment more ad
hoc.
I have had several such transient starlike objects on images since I
started CCD-ing in Nov 2001. They are no pixel or other electronic artefacts.
Possibly cosmic rays although they are usually chaotic in form.
I have had one convincing such burst whereby it was bright on one image ,
very faint on the next one (about 30-60sec later) and not visible on any of the
other hundreds before and after those images of the same star field that night.
It was never sorted out whatit really was
Regards,
Berto Monard
Bronberg Observatory / CBA Pretoria
----- Original Message -----
Sent: Sunday, July 20, 2003 5:55 AM
Subject: [vsnet-chat 6714] Query object
by Cucarella
Query object by Cucarella
We have received
the following query on a bright transient stellar
object(?).
The images have been posted
at:
http://vsnet.kusastro.kyoto-u.ac.jp/pub/vsnet/others/Cucarella/
Could someone identify the nature?
Regards,
Taichi
Kato
===
Dear colleagues:
I send you two CCD images of an
unexpected object observed the past July
17th while I was completing a
program of search and characterization of
new variable stars. I was
surprised by a new bright star that appeared
in a picture but this star
wasn't visible neither in the preceding
images nor the following ones
(that night I took more than 300 images
and I'm currently analysing them).
This object cannot be an asteroid nor
a known variable star because
there's not an object in the Guide 5
Catalogue nor the Simbad
Database.
Because this phenomenon is very brief (less than one minute),
I suspect
that it could be the optic counterpart of a Gamma Ray Buster,
but I have
no news of recent GRB's near this position. Could you confirm
or reject
this observation, please? I have been observing variable stars
for more
than ten years (visual) and making CCD-photometry only for a few
months,
but I'm self-confident with these observations.
The
information about the pictures:
Gea1015p-0059: 60" exposure between
21:54:32 and 21:55:32 UT
Gea1015p-0060: 60" exposure between 21:55:50
and 21:56:50 UT
Position of the object (epoch J2000.0): Alpha:
20h 41' 15.8"
Delta: +21o 26' 41.3"
Telescope: Newton, D=3D150mm
f=3D750 mm
CCD: Starlight Xpresss MX5 camera with a Johnson V
filter.
Observer: Francisco Campos Cucarella
City: Vallirana
(Barcelona, Spain)
Yours faithfully,=20
Francisco
Campos Cucarella
francacu@ya.com
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