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[vsnet-campaign 1314] VSNET Weekly Campaign Summary
VSNET Weekly Campaign Summary
*** Last week news ***
(continuous targets)
V4641 Sgr (RA = 18h19m21s.6, Dec = -25d24'25")
On May 20-21, short-term fluctuations up tp 0.4 mag were detected
(vsnet-campaign-v4641sgr 9, 10). The object has been active also in
X-ray as detected by RXTE/PCA on May 17 and 20. These X-ray
observations indicate that the X-ray activity may have slightly
preceded the optical rise (vsnet-campaign-v4641sgr 11).
The object then started fading. The system experienced a deep
fading between May 22.0 and 22.1 UT. T. Kato suggested that this
dip might be an eclipse (vsnet-campaign-v4641sgr 20, 21, 22, 23,
25).
On late May 22, it again brightened. And short-term variations
also became prominent (vsnet-campaign-v4641sgr 14, 15, 16, 17, 29,
30). The combined data sets sent to the VSNET team show
oscillations between 11.5-13mag with a time-scale of 1 d since May 19
(vsnet-campaign-v4641sgr 13). On May 23, the short-term
oscillations were still strong and some deep dip-like features
appeared (vsnet-campaign-v4641sgr 31, 33, 35). M. Linnolt reported
a momentary flash to mag 10.7 (vsnet-campaign-v4641sgr 26, 38, 42,
63, 64). M. Rupen reported that radio observations on May 23 show
no evidence for extremely rapid fluctuations, or for any dramatic
extension to the source (vsnet-campaign-v4641sgr 36).
On May 24, the object reached one of its brightest peaks at about
10.2mag, as reported by B. Monard (vsnet-campaign-v4641sgr 59). It
was still acitve, but hump-like features were dominate rather than
the dips (vsnet-campaign-v4641sgr 39). The hump amplitudes reached
up to 1.4mag (vsnet-campaign-v4641sgr 44, 45). The simultaneous
observation at Ouda and Kyoto revealed that the color became bluer
during the large humps (vsnet-campaign-v4641sgr 53). C. Markwardt
reported large amplitude X-ray fluctuations, similar to those in the
optical flux (vsnet-campaign-v4641sgr 41).
On May 25, a sudden fading to a near quiescent level was reported
by R. Stubbings (vsnet-campaign-v4641sgr 47, 48, 49, 52). Although
the outburst state seemed to finished, short-term modulations,
particularly 1-mag humps, were still seen in the May 25 light curves
(vsnet-campaign-v4641sgr 50). The object became bluer than on May 24
(vsnet-campaign-v4641sgr 55). B. Sault reported an inverted
spectrum in radio observation (vsnet-campaign-v4641sgr 51). T. Kato
commented that the rise of the radio flux on May 24 seems to be
associated with the optical "flare" following this rapid rise in the
radio (vsnet-campaign-v4641sgr 56). On May 26, the object further
faded to the quiescent level, however still showed 1-mag humps
(vsnet-campaign-v4641sgr 57, 58, 60). The object then suddenly
switched from the violently variable state to a calm state
(vsnet-campaign-v4641sgr 61). The "violently variable" segment of
the light curve lasted for ~hours (vsnet-campaign-v4641sgr 62).
The object is now at the quiescent level, but still active in
short time-scale (vsnet-campaign-v4641sgr 12, 19, 27, 28, 32, 43, 54).
Any kinds of observations are still urgent.
HL CMa (RA = 06h45m17s.0, Dec = -16d51'35")
The active state around 12mag still continues (vsnet-campaign-dn
2444).
PU CMa (RA = 06h40m47s.67, Dec = -24d23'14".6)
After the object faded from an outburst on May 13, it again
experienced an outburst of 12.0mag on May 24, as reported by
R. Stubbiings. The outburst interval is so short that the outburst
may be evolving into superoutburst (vsnet-campaign-dn 2454). The
outburst continues (vsnet-campaign-dn 2461).
V844 Her (RA = 16h25m01s.69, Dec = +39d09'25".9)
Superhumps decreased in amplitude from 0.3 to 0.1mag on May
20-24 (vsnet-campaign-dn 2448, 2462). The superoutburst continues
(vsnet-campaign-dn 2447, 2450).
OY Car (RA = 10h06m22s.46, Dec = -70d14'04".4)
The superoutburst continues (vsnet-campaign-dn 2449, 2453).
V1363 Cyg (RA = 20h06m11s.58, Dec = +33d42'37".7)
An outburst was detected on May 21 at 14.8mag by M. Simonsen
(vsnet-campaign-dn 2446). H. Yamaoka performed astrometry using
images taken by J. Pietz. It confirmed that the object is
identified with a USNO star of r=16.3, which indicates a somewhat
small outburst amplitude (vsnet-campaign-dn 2451, 2455, 2456, 2457,
2459, 2460).
V Sge (RA = 20h20m14s.75, Dec = +21d06'09".0)
The object is now bright at about 10.8mag (May 21-23)
(vsnet-campaign-nl 83).
IY UMa (RA = 10h43m56s.87, Dec = +58d07'32".5)
Superhumps and 1.5-mag eclipses were observed on May 20
(vsnet-campaign-dn 2445). The object has faded from the
superoutburst since about May 22 (vsnet-campaign-dn 2442). Possible
late superhumps were seen on the light curve on May 23
(vsnet-campaign-dn 2458). M. Uemura reported that it was still
slightly above the quiescent level on May 24 (vsnet-campaign-dn 2452).
delta Sco (RA = 16h00m19s.9, Dec = -22d37'17")
S. Otero reported that delta Sco has faded to 1.8mag after its
brightest maximum reached a month ago (vsnet-campaign-be 185).
V2051 Oph (RA = 17h08m19.1s, Dec = -25d48m31.1s)
A rebrightening to 14.5mag was reported on May 23
(vsnet-campaign-v2051oph 19).
*** Future schedule ***
Texas in Tuscany
XXI Symposium on Relativistic Astrophysics
Florence, Italy, December 9-13, 2002
For more information:
http://vsnet.arcetri.astro.it/~texaflor/
[vsnet-campaign-xray 142]
NEW X-RAY RESULTS FROM CLUSTERS OF GALAXIES AND BLACK HOLES
34th COSPAR Scientific Assembly
10th to 12th October 2002 - Houston, Texas
For more information, visit the session website:
www.mssl.ucl.ac.uk/www_astro/cospar
[vsnet-campaign-xray 124]
[vsnet-campaign-agn 2]
[vsnet-campaign-xray 133]
SUPERNOVAE (10 YEARS OF SN1993J)
22-26 April 2003, Valencia, Spain
Web site: http://vsnet.uv.es/2003supernovae/
[vsnet-campaign-sn 342]
34TH COSPAR - GRB AFTERGLOW PHYSICS
HOUSTON, TX, USA, 10-19 OCTOBER 2002
Main Scientific Organizer (MSO):
Elena Pian - INAF, Astronomical Observatory of Trieste, Italy -
pian@ts.astro.it
http://vsnet.ts.astro.it/topics/topix.html
[vsnet-campaign-grb 1]
MASS-LOSING PULSATING STARS AND THEIR CIRCUMSTELLAR MATTER
Sendai, Japan: May 13-16, 2002
contact to: Dr. M. Seki or wsloc@astr.tohoku.ac.jp
http://vsnet.astr.tohoku.ac.jp/ws2002/
[vsnet-campaign-mira 3]
International Conference on Classical Nova Explosions
Sitges (Barcelona), Spain: 20-24 May 2002
For more detailed information, see http://vsnet.ieec.fcr.es/novaconf
[vsnet-campaign-nova 643]
[vsnet-campaign-nova 666]
Blazar meeting at Tuorla: June 17-21, 2002
for more information, see http://vsnet.astro.utu.fi/blazar02
[vsnet-campaign-blazar 232]
*** General information ***
V4641 Sgr
VSNET web page for the current activity:
http://vsnet.kusastro.kyoto-u.ac.jp/vsnet/Xray/v4641sgr02.html
[vsnet-campaign-v4641sgr 24,40,46]
Time-series observations by B. Monard:
http://vsnet.kusastro.kyoto-u.ac.jp/vsnet/Mail/alert7000/msg00339.html
[vsnet-campaign-v4641sgr 18]
Radio light curve presented by M. Rupen:
http://vsnet.aoc.nrao.edu/~mrupen/XRT/V4641Sgr/v4641sgr.shtml
[vsnet-campaign-v4641sgr 37]
X-ray light curve with RXTE/PCA:
http://lheawww.gsfc.nasa.gov/users/swank/v4641sgr/
[vsnet-campaign-v4641sgr 41]
Radio observation by B. Sault:
http://vsnet.atnf.csiro.au/~rsault/astro/v4641
[vsnet-campaign-v4641sgr 51]
SN 2002cv
Web page by A. Paola:
http://vsnet.mporzio.astro.it/cimperatore/WWW/
[vsnet-campaign-sn 430]
V1363 Cyg
CCD images taken by J. Pietz:
http://home.t-online.de/home/Jochen.Pietz/v1363cyg.jpg
[vsnet-campaign-dn 2443]
(This summary can be cited.)
Regards,
Makoto Uemura
Return to Daisaku Nogami
vsnet-adm@kusastro.kyoto-u.ac.jp
VSNET Home Page