Return to Home Page
*** News from VSNET ***
A number of observations of GRB030329 afterglow were reported.
The radio counterpart of IGR J17464-3213 shows a flat spectrum.
For more detail information about these objects,
see below, "VSNET Weekly Campaign Summary" of the last week.
---------------------------------------------------------------------------
VSNET (Variable Star Network) is an international variable star observing
network, covering various areas of novae, supernovae, cataclysmic variables
(CVs), X-ray transients, and other classical eruptive, pulsating, and
eclipsing variables. VSNET is one of invited contributing organizations
to the SkyPub AstroAlert system.
The "News from VSNET", mainly focusing on recent remarkable activities of
CVs and related systems, is issued on a weekly basis, except on occasions
of extremely urgent or transient events.
Please refer to the VSNET Home Page for more details of events and
objects listed.
VSNET Home Page: http://vsnet.kusastro.kyoto-u.ac.jp/vsnet/
VSNET provides a number of mailing lists, on which various news and topics
are discussed. Subscriptions to the VSNET mailing lists are free of charge;
please refer to the instruction on the above page if a reader needs more
information of the list structure.
CCD observations of such targets are a relatively easy task for a 20-40cm
telescope; simply take as many CCD frames (with exposure times 10-30 sec)
as possible, spanning several hours per night. The only requirements are
the weather and your patience! If you need more help on the observing
technique, please feel free to ask on the vsnet-campaign list.
We would sincerely appreciate volunteers who would join the VSNET
Collaboration team to study the wonders of these exotic variable stars.
To join the VSNET campaign collaborative list, send an e-mail to
vsnet-adm@kusastro.kyoto-u.ac.jp (VSNET administrator)
with a line "SUBSCRIBE vsnet-campaign."
(VSNET campaign members are strongly recommended to subscribe to vsnet-alert
at the same time).
Regards,
Taichi Kato
On behalf of the VSNET administrator team
----------------------------------------------------------------------------
The following was issued on April 8, 2003, as VSNET campaign
circulation 1381
[Note a large part of detailed information is posted to vsnet-campaign
sub-lists].
VSNET Weekly Campaign Summary
*** Last week news ***
(new targets)
SN 2003cj (RA = 12h15m51s.90, Dec = +08d59'15".7)
SN 2003cj is hosted by a very dim (mag about 20) galaxy
(vsnet-campaign-xn 592).
SN 2003ck (RA = 13h06m21s.72, Dec = +03d04'21".0)
SN 2003ck is hosted by MAPS-NGP O_557_1733751, also a dim (mag
18.5) galaxy (vsnet-campaign-sn 592).
SN 2003cl (RA = 12h38m50s.11, Dec = -02d49'58."8)
SN 2003cl is hosted by 2dFGRS N186Z103, a distant (v_r = 50000
km/s) galaxy (vsnet-campaign-sn 592).
SN 2003cm (RA = 16h50m55s.02, Dec = +59d43'18".1)
SN 2003cm is hosted by UGC 10590, a face-on barred-spiral galaxy.
The expected maximum for typical SN Ia is mag about 14.8. The
reported magnitude is about 19.4, so it is very subluminous or
reddened or old event (vsnet-campaign-sn 592).
SN 2003cn (RA = 13h07m37s.05, Dec = -00d56'49".9)
SN 2003cn is hosted by IC 849, a face-on spiral galaxy. The Las
Campanas spectrum taken on Mar. 31.31 UT revealed that it was type II
SN about 2-3 weeks after explosion (IAUC 8102). The discovery
magnitude (18.1: mag) is typical for the gravitational-collapse
event (vsnet-campaign-sn 592).
SN 2003co (RA = 10h49m39s.91, Dec = +29d21'44".6)
SN2003co is hosted by 2MASXi J1049404+292152, a distant (v_r =
25000 km/s) spiral galaxy (vsnet-campaign-sn 593).
SN 2003cp (RA = 08h09m11s.13, Dec = +57d41'14".0)
SN 2003cp is hosted by MCG +10-12-78, a spiral galaxy. The
expected maximum for typical SN Ia is consistent with the
discovery magnitude (about 16.2mag) (vsnet-campaign-sn 593).
The CfA team reported that the spectrum taken on Apr. 1.18 resembles
that of SN Ia 2-3 weeks after maximum, but there are some
unusuality. H. Yamaoka reported that it can be somewhat younger
(vsnet-campaign-sn 596).
SN 2003cq (RA = 11h56m14s.17, Dec = +60d31'19".1)
SN 2003cq is hosted by NGC 3978, a face-on spiral galaxy making a
pair with 2' west NGC 3975. The expected maximum for typical SN Ia
is consistent with the discovery magnitude (about 17.0mag)
(vsnet-campaign-sn 593). The CfA team has revealed that it was type
Ia supernova, about a week before maximum on Apr. 3.28
(vsnet-campaign-sn 597).
SN 2003cr (RA = 14h58m35s.53, Dec = +44d53'06".4)
SN 2003cr is hosted by UGC 9639, a spiral galaxy. The expected
maximum for typical SN Ia is consistent with the discovery magnitude
(17.7-17.5mag) (vsnet-campaign-sn 593).
SN 2003cs (RA = 11h20m37s.52, Dec = -04d54'32".7)
SN 2003cs is hosted by 2MASXi J1120375-045437, a dim galaxy. The
discovery (early February) magnitude (about 17.9mag) is consistent
with the expected maximum for typical SN Ia (vsnet-campaign-sn 593).
SN 2003ct (RA = 11h22m56s.20, Dec = -02d56'59".9)
SN 2003ct is hosted by CGCG 011-083, a distant spiral galaxy. The
expected maximum for typical SN Ia is mag about 18.2
(vsnet-campaign-sn 593).
CC Cnc (RA = 08h36m19s.17, Dec = +21d21'05".4)
An outburst to 13th mag was reported by E. Muyllaert and H. McGee
on March 30 (vsnet-campaign-dn 3564).
SN 2003cu (RA = 10h53m02s.66, Dec = -00d41'03".9)
SN 2003cu is hosted by SDSS J105303.06-004107.1, an apparently
edge-on spiral galaxy. The expected maximum for typical SN Ia is
comparable to the observed magnitude (~20mag) (vsnet-campaign-sn 595).
SN 2003cv (RA = 11h17m48s.36, Dec = +19d09'08".5)
SN 2003cv is hosted by MAPS-NGP O_433_0206212, an apparently
disturbed spiral galaxy with mag about 19 (vsnet-campaign-sn 595).
SN 2003cw (RA = 11h24m03s.88, Dec = +23d20'44".8)
SN 2003cw is hosted by 2MASXi J1124038+232034, a dim galaxy
(vsnet-campaign-sn 595).
SN 2003cx (RA = 13h57m06s.46, Dec = -17d02'22".6)
SN 2003cx is hosted by a dim (mag about 18) galaxy, which has
stellar appearance on DSS images (vsnet-campaign-sn 596).
SN 2003cy (RA = 10h46m04s.27, Dec = +27d20'57".2)
SN 2003cy is hosted by an anonymous dim (rmag about 17) galaxy
(vsnet-campaign-sn 597).
SN 2003cz (RA = 12h05m53s.57, Dec = +33d27'13".0)
SN 2003cz is hosted by MAPS-NGP O_267_0568522, a dim (mag about
18.5) galaxy (vsnet-campaign-sn 597).
V729 Sgr (RA = 19h16m49s.15, Dec = -26d14'33".2)
The eclipsing dwarf nova V729 Sgr is in outburst as reported by
R. Stubbings on April 5 (vsnet-campaign-dn 3569).
AG Hya (RA = 09h50m30s.94, Dec = -23d45'03".7)
The outburst, which was detected by R. Stubbings on April 2, was
still ongoing on April 6 (vsnet-campaign-dn 3570).
Possible supernova in M3
A possible supernova was reported in M3. T. Kato reported that it
may be the Cepheid M3 V154, but further observations anc
confirmation are required (vsnet-campaign-sn 591).
KT Mon (RA = 06h25m18s.5, Dec = +05d26'32")
The 15-th mag magnitude in some catalogs refers to an incorrect
quiescent identification by Khatisov, A. S. (1971), which referred
to a GSC 2.2 star at 06:25:19.69 +05:26:32.9. The actual location
of KT Mon is void of a quiescent counterpart down to mag 20.
According to Kato and Yamaoka (2000), KT Mon can be either a WZ
Sge-type dwarf nova and an X-ray transient (vsnet-campaign-nova 1117).
theta CrB (RA = 15h32m55s.8, Dec = +31d21'33")
S. Otero reported that theta CrB is active again
(vsnet-campaign-be 227).
(continuous targets)
GRB030329 (RA = 10h44m50s.030, Dec = +21d31'18".15)
B. Monard reported that the afterglow remained constant at 16.7CR
between 19:51 and 23:35 UT on March 31 (vsnet-campaign-grb
16). Observations of the afterglow were reported to VSNET
(vsnet-campaign-grb 17, 18, 23, 25, 27, 19, 20, 21, 22, 24, 26).
CR Boo (RA = 13h48m55s.42, Dec = +07d57'30".3)
Reported observations may indicate that it is now in a oscillating
phase (vsnet-campaign-dn 3573).
AK Cnc (RA = 08h55m21s.21, Dec = +11d18'14".7)
The superoutburst continues (vsnet-campaign-dn 3562).
AD Men (RA = 06h04m28s.60, Dec = -71d25'15".6)
The light curve taken by B. Monard did not reveal a definte
periodicity, although there is a slight increase of a power around
period 0.06 d. Combined with the fading reported on March 31, the
object is likely an SS Cyg-type dwarf nova (vsnet-campaign-dn 3561, 3565).
IGR J17464-3213 (RA = 17h46m15s.61, Dec= -32d13'59".9)
B. Monard reported no bright counterpart was detected
(vsnet-campaign-xray 212, 214, vsnet-campaign 1380BR). E. Kuulkers
reported that apparently IGR J17464-3213's position is quite close
to the catalogued position of the black-hole candidate transient
H1743-322 (vsnet-campaign-xray 213). M. Rupen et al. reported that
the radio flux continues increasing and the spectrum can be
described with a flat spectrum, indicating a bright IR counterpart
(vsnet-campaign 1379, vsnet-campaign-xray 216). According to ATEL
#140, I. Khamitov et al. detected a possible optical counterpart
(I~20) of this new X-ray transient at R.A.=17h46m15.6s,
Dec=-32o14'01.2'' (vsnet-campaign-xray 217).
R CrB (RA = 15h48m34s.40, Dec = +28d09'23".)7
The object is brightening, but the brightening trend has become
slower (vsnet-campaign-rcb 121, 125).
SN 2003cg (RA = 10h14m15s.97, Dec = +03d28'02".5)
Recently reported observations can be seen in [vsnet-campaign-sn 594].
V348 Sgr (RA = 18h40m19s.94, Dec = -22d54'29".1)
The object has been fading again since early March
(vsnet-campaign-rcb 122).
1RXP J113123+4322.5 (RA = 11h31m22s.426, Dec = +43d22'38".51)
The object is now in a post-superoutburst stage (vsnet-campaign-dn 3563).
SN 2003bv (RA = 07h22m11s.92, Dec = +40d28'01".5)
The CfA team revealed that it is a type II supernova. The
recession velocity deduced from the H-alpha emission peak is about
14000 km/s, which is consistent with the NED value. The SN can be a
very luminous event, or the host galaxy has a peculiarly large
proper motion relative to the Hubble flow. The apparent size of the
galaxy seems large, so the latter possibility should be considered
(vsnet-campaign-sn 597).
Z UMi (RA = 15h02m01s.35, Dec = +83d03'48".7)
The gradual brightening continues (vsnet-campaign-rcb 123).
V854 Cen (RA = 14h34m49s.8, Dec = -39d33'18")
The object is now at faint minimum (vsnet-campaign-rcb 124).
SN 2003bw (RA = 14h57m22s.44, Dec = -19d12'45".9)
The Las Campanas spectrum taken on Mar 31.39 revealed that it was
of type II, at least two months after explosion (vsnet-campaign-sn 593).
eta Car (RA = 10h45m03s.65, Dec = -59d41'03".7)
S. Otero reported that Eta Carinae is not acting too much in the
visual. It stays around V=5.2, although it seems to be brightening
slowly (vsnet-campaign-sdor 30).
V4743 Sgr (RA = 19h01m09s.38, Dec = -22d00'06".2)
D. West reported a decrease in H Alpha emission from the 12 Oct
2002 (vsnet-campaign-nova 1178). He also reported that it has
undergone large changes in the V-Rc color during the coarse of the
outburst (vsnet-campaign-nova 1179, 1181, 1182, 1184, 1185).
Time-series observations on April 5 showed no clear short-term
variation (vsnet-campaign-nova 1183).
BR Lup (RA = 15h35m51s.61, Dec = -40d34'25".4)
An outburst to 14.6mag was reported on April 3 by R. Stubbings.
The object further brightened to 14.0mag on April 6, which indicates
that it is definitely a superoutburst (vsnet-campaign-dn 3571).
The data obtained by G. Bolt on April 7 clearly show fully grown
superhumps with an amplitude of 0.20 mag. The data also show some
hint of quasi-periodic oscillations (QPOs). The superhump period
determined from this single-night run is 0.083 d, which is generally
in agreement with, but seems to be slightly longer than the
previously determined period (vsnet-campaign-dn 3574).
V803 Cen (RA = 13h23m44.5s, Dec = -41d44'30".1)
Reported observations show that it is still in a bright state,
which may be a superoutburst or a oscillatory stage
(vsnet-campaign-dn 3572).
*** Future schedule ***
"X-ray and Radio Emission of Young Stars"
July 28 - 29, 2003, Rikkyo University, Tokyo, Japan
for more information , please contact to kitamoto@rikkyo.ne.jp
[vsnet-campaign-xray 218]
Conference: THE INTERPLAY AMONG BLACK HOLES, STARS AND ISM IN
GALACTIC NUCLEI
in Gramado, south of Brasil, March 1-5, 2004
for more information, please contact to BHSIGN@if.ufrgs.br
[vsnet-campaign-agn 3]
V4641 Sgr: XMM-Newton observation
Start time: 2003-04-12 21:51:39 UT
End time : 2003-04-13 11:44:59 UT
Simultaneous observations are encouraged.
For more information, please contact to M. Uemura
uemura@kusastro.kyoto-u.ac.jp
[vsnet-campaign-xray 204]
[vsnet-campaign-v4641sgr 165]
eta Car: The next "shell event"/X-ray eclipse
M. Corcoran reported the event will occur this summer.
Coordinated ground-based observations of eta car along with the
X-ray observations would be really important.
For more information:
Latest X-ray light curve:
http://lheawww.gsfc.nasa.gov/users/corcoran/eta_car/etacar_rxte_lightcurve/
[vsnet-campaign-sdor 23, 24,
25, 26, 28, 29]
[vsnet-campaign-xray 172]
Light curve provided by S. Otero:
http://ar.geocities.com/varsao/Curva_Eta_Carinae.htm
[vsnet-campaign-sdor 22]
The 2003 Gamma Ray Burst conference
Hosted by Los Alamos,
in Santa Fe, New Mexico (USA), between September 8 and 12, 2003
http://grb2003.lanl.gov/
[vsnet-campaign-grb 13]
SUPERNOVAE (10 YEARS OF SN1993J)
22-26 April 2003, Valencia, Spain
Web site: http://vsnet.uv.es/2003supernovae/ [vsnet-campaign-sn 342]
[vsnet-campaign-sn 452]
[vsnet-campaign-sn 512]
*** General information ***
AD Men
Ourtubrst image taken by B. Heathcote:
http://vsnet.kusastro.kyoto-u.ac.jp/pub/vsnet/AD_Men/admen.gif
[vsnet-campaign-dn 3561]
XTE J1550-564
VSNET page:
http://vsnet.kusastro.kyoto-u.ac.jp/vsnet/Xray/v381nor.html
[vsnet-campaign-xray 211]
theta CrB
Be star newsletter:
http://vsnet.astro.virginia.edu/~dam3ma/benews/volume36/rivi/rivi1.html
Chart:
http://ar.geocities.com/varsao/Carta_theta_CrB.htm
[vsnet-campaign-be 227]
SN 2003cp
The spectrum taken by the CfA team:
http://cfa-www.harvard.edu/cfa/oir/Research/supernova/spectra/sn2003cp-20030401.flm.gif
[vsnet-campaign-sn 596]
IGR J17464-3213
VSNET page:
http://vsnet.kusastro.kyoto-u.ac.jp/vsnet/Xray/igrj1746.html
[vsnet-campaign-xray 215]
V4742 Sgr and GSC 6846:6
Observations by D. West:
http://members.aol.com/dwest61506/page25.html
[vsnet-campaign-nova 1180]
[vsnet-campaign-unknown 196]
V601 Sco
CCD image taken by P. Nelson:
http://vsnet.kusastro.kyoto-u.ac.jp/pub/vsnet/DNe/V601_Sco/nel1.jpg
http://vsnet.kusastro.kyoto-u.ac.jp/pub/vsnet/DNe/V601_Sco/nel1.fit [FITS]
[vsnet-campaign-dn 3568]
also see, [vsnet-campaign-dn 3566, 3567]
V729 Sgr
Eclipse ephemeris, see [vsnet-campaign-dn 3569]
Corrigendum:
In the last "VSNET Campaign Summary",
> XTE J1550-564 (RA= 15h50m58s.68, Dec = -56d28'34".8)
...
> X-ray outburst was detected also with RXTE/PCA
^^^^^^^^
RXTE/ASM
Sorry for confusion.
(This summary can be cited.)
Regards,
Makoto Uemura
Return to the Daisaku Nogami
vsnet-adm@kusastro.kyoto-u.ac.jp
