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[vsnet-campaign 1168] VSNET Weekly Campaign Summary
VSNET Weekly Campaign Summary
*** Last week news ***
(new targets)
SN 2001ef (RA = 04h44m28s.56, Dec = +75d38'30".3)
M. Armstrong discovered SN 2001ef on September 9 at mag 16.1.
The position is about 1" east and 8" north of the center of the
barred-spiral galaxy IC 381 = UGC 3130. From the recession
velocity of the host galaxy of 2476 km/s, the expected maximum of
the normal SN Ia is mag about 14.3. The SN did not detected on the
image taken by the discoverer on Aug. 29, so it seems to be
something fresh. On the other hand, the multicolor photometry
at Apache Point observatory (Sept. 10.44) shows that it seems to
be somewhat red. It can be reddened by the interstellar
(or circumstellar) matter (vsnet-campaign-sn 238).
CXOU J004305.5+411703 (RA = 00h43m05s.55, Dec = +41d17'03".3)
ATEL No. 76 tells that a new X-ray transient has been discovered
by Kong et al., in Chandra observation on 2001 August 31.54.
Its X-ray luminosity (0.5-10keV) is reported to be 2.7*10^38
erg/s, typical for X-ray novae (vsnet-campaign-xray 94).
(continuous targets)
V4740 Sgr = Nova Sgr 2001 No. 3
(RA = 18h11m45s.82, Dec = -30d30'49".9)
The object was slowly fading with some fluctuations until September
11 when a brightening to 6.9mag was reported (vsnet-campaign-nova
548, 551, 553, 554). T. Kato noted that there seems to be ~2 days
periodicity in reported magnitude to VSNET (vsnet-campaign-nova 555).
The object keeps the oscillations (vsnet-campaign-nova 559, 560)
and fading speed is very gradual. It is now around 7.1mag
(vsnet-campaign-nova 565).
XTE J1650-500 (RA = 16h50m01s.0, Decl. = -49d57'45")
IAUC No. 7710 tells that Augusteijn et al. obtained an optical
spectrum which shows Balmer emission lines, and they report that
the identification of the optical counterpart has been confirmed
(vsnet-campaign-xray 92). M. Revnivtsev reported the detection
of QPOs of 1.13-2.73 Hz with amplitudes of 5-7% through RXTE X-ray
observations. X-ray spectrum is similar to that of Cyg X-1 and
other black hole binaries in the low/hard spectral state
(vsnet-campaign-xray 93).
MV Lyr (RA = 19h07m15s.93, Dec = +44d01'10".7)
The outburst continues. The current magnitude is reported
to be around 13.8mag (vsnet-campaign-nl 32, 33, 34).
GX Cas (RA = 00h49m01s.46, Dec = +56d52'44".8)
The outburst faded as reported on September 13 (vsnet-campaign-dn
1557).
V844 Her (RA = 16h25m01s.69, Dec = +39d09'25".9)
The superoutburst continued until September 15 when the object
rapidly faded (vsnet-campaign-dn 1535, 1543, 1549, 1556, 1560,
1567, 1572).
HO Del (RA = 20h36m55s.49, Dec = +14d03'09".4)
The superoutburst continued until around September 8. The object
significantly faded on September 9 (vsnet-campaign-dn 1534).
V4739 Sgr = Nova Sgr 2001 No. 2
(RA = 18h24m46s.04, -30d00'41".1)
The fading seems to be stopped around September 8-9
(vsnet-campaign-nova 552), and again start fading on September 11
(vsnet-campaign-nova 556). H. Itoh reported an early observation
of 12mag on August 18 (vsnet-campaign-nova 562). The object is
currently at about 13.0mag (vsnet-campaign-nova 556).
V2275 Cyg = Nova Cyg 2002 No. 2
(RA = 21h03m02s.00, Dec = +48d45'52".9)
The fading speed became slower. It is now around 11.4mag
(vsnet-campaign-nova 564).
WZ Sge (RA = 20h07m36s.53, Dec = +17d42'15".3)
The rebrightening activity has became changed. This historical
event seems to enter a new period (vsnet-campaign-dn 1533, 1542,
1544, 1546, 1548, 1553, 1554, 1559, 1563, 1566, 1573). International
campaign is still extensively ongoing (vsnet-campaign-dn 1547,
1564, 1565).
On September 10, the object was fading from the 11-th rebrightening.
The humps became very apparent (vsnet-campaign-dn 1537), however
their profiles were quite different from the previous one. It
shows sinusoidal variations and no hump like feature
(vsnet-campaign-dn 1538). The fading was ongoing, and the object
became faintest since the first rebrightening (vsnet-campaign-dn 1540,
vsnet-campaign 1163, vsnet-campaign-dn 1541).
On September 11, the HST observation of WZ Sge was performed
(vsnet-campaign-dn 1532). The fading stopped (vsnet-campaign 1165),
and the 12-th rebrightening was reported (vsnet-campaign-dn 1545).
The object took a very slow rise between Sep. 11.5 and 12.5.
The rise time of ~1 d is extremely long compared to those of the
previous rebrightenings (vsnet-campaign 1166). On this ascending,
there were huge humps at phase 0.85. Sharp eclipses and phase 0.5
dip are also seen (vsnet-campaign-dn 1551).
After the peak on September 12, the object again faded
(vsnet-campaign-dn 1550). The fading speed was comparable to the
last one (vsnet-campaign-dn 1558).
On early September 13, the fading continued, and then stopped
this trend (vsnet-campaign-dn 1561). At the bottom, the amplitude
of humps are reduced (vsnet-campaign-dn 1562). On September 15,
the object remained the same magnitude and not in rapid fading or
rebrightening (vsnet-campaign-dn 1568, 1570, 1571). Low-amplitude
humps were seen (vsnet-campaign-dn 1569).
V1548 Aql (RA = 19h07m28s.42, Dec = +11d44'45".8)
The object became brighter to 13.6mag as reported by M. Verdenet
on September 11 (vsnet-campaign-nova 557, 558, 563).
V2274 Cyg (RA = 20h07m17s.94, Dec = +36d04'37".2)
The object was reported to be very faint at around 16.2mag during
the last week (vsnet-campaign-nova 549).
KV And (RA = 02h17m13s.85, Dec = +40d41'30".6)
The summary of the last superoutburst can be seen in
[vsnet-campaign-dn 1536].
V445 Pup (RA = 07h37m56s.88, Dec = -25d56'59".1)
M. Rupen reported that ratio observations with VLA detected
radio emission from the peculiar variable V445 Pup. The observations
show a new, ~10 mJy radio source coincident with the optical source
(vsnet-campaign-nova 550, vsnet-campaign 1164).
BL Lac (RA = 22h02m42.86s, Dec = +42d16'37.6")
The object is still rather faint at around 15mag
(vsnet-campaign-blazar 225).
*** Future schedule ***
WZ Sge campaign
D. Steeghs wrote:
"Several of us are organizing a campaign on the current outburst
of WZ Sge, using a large variety of ground based facilities as well as
space observatories. A web-page has been setup listing the scheduled
observations so far which we intend to keep up to date at:
http://vsnet.astro.soton.ac.uk/~ds/wzsge.html
"
For more information, see [vsnet-campaign 1039]
V446 Her campaign until September
conducted by Matthias Schreiber, Boris Gaensicke, and Daisaku Nogami
For more detailed information, see [vsnet-campaign-dn 918],
[vsnet-campaign-nova 349], or [vsnet-campaign 983]
Supernova campaign: A great opportunity for amateurs by M. Schwartz.
For more detailed information, see [vsnet-campaign-sn 233]
*** General information ***
WZ Sge
nightly averaged magnitudes, see [vsnet-campaign-dn 1539, 1552]
CCD photometry by S. Kiyota is available at [vsnet-campaign-nova 561]
(This summary can be cited.)
Regards,
Makoto Uemura
vsnet-adm@kusastro.kyoto-u.ac.jp
Return to Daisaku Nogami
vsnet-adm@kusastro.kyoto-u.ac.jp
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