Sziasztok,

Ha meg valaki emlekszik: az XTE J1118+480, maskeppen KV UMa par eve
volt eloszor kitoresben, amikor megmertek a rontgenkettos tomeget,
s kiderult, hogy egy ~10 naptomegu fekete lyuk van benne. Mint az
alabbi korlevelekbol kiderul, ujra aktiv, torok eszlelok szerint 13
magni koruli maximumban van eppen. CCD-sek fenhetik a fogukat es
chipuket... (es elofizethetik a mira-listat is, hogy ne kelljen
mindent ketszer mondani, ketszer mondani)

Ksl

----------  Forwarded Message  ----------

Subject: ATel  385, 386, 387. Daily Email Digest
Date: Friday 14 January 2005 17:30
From: atel@astronomerstelegram.org
To: l.kiss@physics.usyd.edu.au

-----------
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------------ The Astronomer´s Telegram
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------------ Posted: Thu Jan 13 01:30:00 EST 2005 -- Fri Jan 14
01:30:01 EST 2005
=================================================================
============ ATEL #385      ATEL #385

Title: Radio detection of XTE J1118+480 at 15 GHz
Author: G.G.Pooley
Queries: ggp1@cam.ac.uk
Posted: 13 Jan 2005;  10:32  UT
Subjects: Radio, Request for Observations, Black Holes, Transients

A renewed optical and X-ray outburst of the Black Hole candidate
XTE J1118+480 is reported in ATEL#383 and ATEL#384. A radio
observation at 15 GHz was made with the Ryle Telescope at
Cambridge from 2005 Jan 12 21h59m to Jan 13 09h57m (UT). The mean
flux density was 8.7 mJy, with an increase of about 10% during the
12-h observation. This flux density is close to the mean (9.0 mJy)
found during observations of the previous outburst in 2000 Mar -
Jun.

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Observations). Password Certification:  Guy Pooley
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http://www.astronomerstelegram.org/?read=385
=========== ATEL #386      ATEL #386

Title: Optical Outburst of  XTE J1118+480
Author: U.Kiziloglu (METU), S. Balman (METU), A. Baykal (METU), E.
Gogus (SU), A. Alpar (SU), C. Inam (Baskent)
Queries: solen@astroa.physics.metu.edu.tr
Posted: 13 Jan 2005;  17:34  UT
Subjects: Optical, Request for Observations, Binaries, Black Holes,
Transients

We report the monitoring of black hole X-ray transient XTE
J1118+480(=KV UMa) during its new optical outburst and faint X-ray
outburst. The data is obtained with the ROTSE IIId telescope
(Robotic Optical Transient Search Experiment III) at TUG (Tubitak
National Observatory) Antalya, Turkey (IAUC#7418, ATEL#64, #67,
#383, #384, #385). The observations stared on UT 2004 Dec 12.9 and
the source is still being monitored by our group. XTE J1118+480
was found in quiescence (using ROTSE calibrated [USNO A2.0] R
magnitudes) on 2005 Jan 4.95 at a magnitude of R=17.7 . Following
this date, on 2005 Jan 6.94 R=14.3, and on 2005 Jan 9.94 R=13.3.
Our final observation on 2005 Jan 12.93 indicates R=12.93 for the
source. The lightcurve is tending to a plateau (probable maximum).
The rise in the light curve can not be fitted with a single power
law or exponential function. We find that the rise can be modelled
using a power law with an index of ~ 0.14    followed by an
exponentail rise with a time constant of ~1.55 days. A light curve
of the optical outburst of XTE J1118+480 can be found at the URL
http://astroa.physics.metu.edu.tr/BHC along with images in
quiesence and outburst.

----------- Password Certification:  Ersin Gogus
(ersing@sabanciuniv.edu)
http://www.astronomerstelegram.org/?read=386
=========== ATEL #387      ATEL #387

Title: Further radio observations of XTE J1118+480
Author: M.P. Rupen (NRAO/GSFC), V. Dhawan, A.J. Mioduszewski
(NRAO) Queries: mrupen@nrao.edu
Posted: 13 Jan 2005;  21:50  UT
Subjects: Radio, Optical, X-ray, Binaries, Black Holes, Transients

Very Large Array (VLA) observations of the black hole candidate
binary XTE J1118+480 (e.g., ATEL #383, ATEL #384, ATEL #386)
confirm   Pooley´s report of renewed radio activity (ATEL #385).
All data were   observed on MJD 53383.32-.35, overlapping the end
of Pooley´s observations.   A preliminary reduction gives the
following spectrum:

4.86 GHz: 5.8 +/- 0.1 mJy
8.46 GHz: 9.5 +/- 0.1 mJy
14.94 GHz: 8.5 +/- 0.5 mJy
22.46 GHz: 10.1 +/- 1.1 mJy
43.34 GHz: > 5.8 +/- 1.0 mJy

The uncertainties are 1sigma based on the rms noise in the map.
The overall   spectrum is roughly flat above 8 GHz, consistent
with Pooley´s 15 GHz datum,   and as expected for a source in the
low/hard state.  The sharply rising   spectrum from 4.9 to 8.5 GHz
(nu^0.89+/-0.04) is more surprising, and may   suggest an
additional source of absorption, e.g., from ionized gas near   the
source.  Further radio observations are planned.

The National Radio Astronomy Observatory is a facility of the
National Science Foundation operated under cooperative agreement
by Associated Universities, Inc.

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--
Laszlo L. KISS
PhD, postdoctoral fellow
# School of Physics, University of Sydney, Australia
# Hungarian Astronomical Association, Variable Star Section
## e-mail        : laszlo@physics.usyd.edu.au
## URL           : http://www.physics.usyd.edu.au/~laszlo
## phone         : 9351-4058