[vsolj-alert 949] VSNET Weekly Campaign Summary

[Taichi Kato <tkato@kusastro.kyoto-u.ac.jp>]

From owner-vsnet-campaign@kusastro.kyoto-u.ac.jp Tue Sep 11 04:30 JST 2001
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Date: Tue, 11 Sep 2001 04:30:51 +0900
From: Makoto Uemura <uemura@kusastro.kyoto-u.ac.jp>
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VSNET Weekly Campaign Summary

*** Last week news ***

(new targets)
  SN 2001ed		(RA = 01h51m51s.08, Dec = +06d17'27".4)

    M. Migliardi discovered a supernova, SN 2001ed on September 
  2.96 and 3.01 when the object was 14.9mag.  The position is about 
  9" east and 20" south of the nucleus of the face-on spiral galaxy 
  NGC 706.  The reported magnitude is far brighter than the expected 
  maximum of SN Ia from the recession velocity of NGC 706.  It seems 
  the same case as SN 2001cj, who has a great concern of its distance
  (vsnet-campaign-sn 234, 235).  Prediscovery observations informed 
  in IAUC 7704 shows that the object can be a type II SN in its 
  plateau phase, or other type SN some days (or a week) after maximum 
  (vsnet-campaign-sn 236).
  
	
  Nova Sgr 2001 No. 3 = V4740 Sgr
			(RA = 18h11m45s.82, Dec = -30d30'49".9)

    IAUC 7706 informed that Nova Sgr 2001 No.3 was independently 
  discovered by A. J. S. Pereira (7.0mag on September 5) and W. Liller 
  (10.0mag on September 3)(vsnet-campaign-nova 517).  Confirmations 
  were reported to VSNET by J. Carvajal (vsnet-campaign-nova 516).  
  The object reached 6.5mag around September 6 (vsnet-campaign-nova 
  518, 519, 522, 523, 526, 527, 530).  Early multi-color observations 
  on September 6 were reported by A. Price (vsnet-campaign-nova 520).  
  H. Yamaoka reported that no object brighter than the limit 
  (rmag about 20) exists within 4" around the position 
  (vsnet-campaign-nova 521).  M. Fujii performed spectroscopy which 
  yielded the spectrum with H-alpha H-beta in emission.  The emission 
  lines of Fe II series are prominent, indicating that the object is 
  a Fe-II class nova (vsnet-campaign-nova 536).  There was a temporary 
  minimum of ~7.5mag around September 9, and then, the object 
  gradually brightened to 6.8-7.0mag (vsnet-campaign-nova 528, 531, 
  532, 534, 537, 538, 539, 540, 541, 545, 546).  

  
  XTE J1650-500		(RA = 16h50m01s.0, Decl. = -49d57'45")

    R. Remillard, RXTE/ASM team, reported that the RXTE/ASM has 
  detected X-ray emission from a new source, XTE J1650-500.  
  The first detection was made on September 5.637, with an X-ray
  intensity (2-12 keV) of 0.14(.02) Crab, rising to 0.24(.01) Crab 
  on Sept. 6.432 and 0.27(.01) Crab on Sept. 6.896 
  (vsnet-campaign-xray 87, vsnet-campaign 1158).  It was confirmed 
  with RXTE/PCA and J. Swank reported that the continuum spectrum 
  was a power law with a photon index of 1.5 and a small amount 
  of a black body with kT = 1.2 keV, typical of hard states of black 
  hole candidates (vsnet-campaign 1160, vsnet-campaign-xray 88).  
  Its optical counterpart was detected at B=17 and I=17.2+/-0.2 as 
  reported by Castro-Tirado et al. and Groot et al. 
  (vsnet-campaign-xray 89, 90, 91).

 
  MV Lyr		(RA = 19h07m15s.93, Dec = +44d01'10".7)

    As reported by M. Verdenet on September 4, MV Lyr is in outburst 
  at 14.1mag (vsnet-campaign-nl 27, 28).  The object further brightened 
  on September 5 (vsnet-campaign-nl 29).  The outburst continues 
  (vsnet-campaign-nl 30, 31).


  PKS 2155-304          (RA = 21h58m52s, Dec = -30d13'31")

    As reported by B. Monard in the last week, this blazar has 
  further brightened to 12.6-12.9mag (vsnet-campaign-blazar 223, 224).


  DM Lyr		(RA = 18h58m45s.02, Dec = +30d15'39".9)

    As observed by M. Simonsen on September 4, the SU UMa-type dwarf 
  nova DM Lyr experiences an outburst at 14.5mag (vsnet-campaign-dn 
  1495).  The outburst is ongoing (vsnet-campaign-dn 1505).

 
  RX J1155.4-5641	(RA = 11h55m27.6s, Dec = -56d41'48")

    The object experienced an bright outburst of 12.0mag on 
  September 6 as reported by B. Monard (vsnet-campaign-dn 1509).


  GX Cas		(RA = 00h49m01s.46, Dec = +56d52'44".8)

    As reported by H. McGee on September 9, the SU UMa-type dwarf 
  nova GX Cas experienced an outburst of 13.8mag, however significantly 
  faded rapidly (vsnet-campaign-dn 1526).


(continuous targets) 
  V844 Her		(RA = 16h25m01s.69, Dec = +39d09'25".9)

    The superoutburst continues and the current magnitude is around 
  13mag (vsnet-campaign-dn 1479, 1487, 1504, 1513, 1517, 1525).


  HO Del		(RA = 20h36m55s.49, Dec = +14d03'09".4)

    The superoutburst is still ongoing (vsnet-campaign-dn 1493, 1524).


  V4739 Sgr = Nova Sgr 2001 No. 2  
			(RA = 18h24m46s.04, -30d00'41".1)

    The nova has further faded.  It is now around 12.5mag 
  (vsnet-campaign-nova 509, 511, 513, 524, 535, 542).


  SN 2001du		(RA = 03h33m28s.7, Dec = -36d08'32")

    IAUC 7704 informed that SN 2001du was revealed as type II 
  caught on the early phase (vsnet-campaign-sn 237).


  V2275 Cyg = Nova Cyg 2002 No. 2	
			(RA = 21h03m02s.00, Dec = +48d45'52".9)

    The object has been smoothly fading (vsnet-campaign-nova 510, 512).
  The decline rate became somewhat slower around September 6 
  (vsnet-campaign-nova 514, 529, 543).
 

  WZ Sge		(RA = 20h07m36s.53, Dec = +17d42'15".3)

    The rebrightening phenomena are still ongoing (vsnet-campaign-dn 
  1478, 1480, 1486, 1494, 1497, 1506, 1508, 1512, 1514, 1516, 1523, 
  1531).
    At the top of the seventh rebrightening, eclipses were still 
  seen and humps became weak (vsnet-campaign-dn 1490).  It was faded 
  on September 3 and the humps were again stronger (vsnet-campaign 
  1156).  The onset of the eighth one was reported on September 4 by 
  L. Cook (vsnet-campaign-dn 1485, 1488).  At the top, no strong QPOs 
  were detected and two dips (not eclipse) were intensive 
  (vsnet-campaign-dn 1496, 1499).  The object started rapid fading 
  within one day, which means that the period of rebrightening has 
  shortened to 1.5 d (vsnet-campaign-dn 1489, 1498).  On September 5, 
  J. Pietz's observation detected the 9-th rebrightening 
  (vsnet-campaign-dn 1501).  D. Starkey's data shows defined humps 
  and a hard, sharp eclipse during this rebrightening 
  (vsnet-campaign-dn 1502).  The main humps occurred earlier than 
  before (vsnet-campaign-dn 1503).  The hump profile is similar 
  to that of the 4-th rebrightening, and it may be related to 
  9-d beat period (vsnet-campaign 1157).  After the 9-th rebrightening 
  had faded, the next 10-th brightening was detected on September 7 
  by D. Starkey's observations (vsnet-campaign-dn 1511).  On the 
  fading from the maximum, humps and eclipses, which were slightly 
  earlier than predicted times, clearly appeared (vsnet-campaign-dn 
  1518, 1521).  The rate of the fading seems to become larger 
  (vsnet-campaign-dn 1519).  Possible QPOs were reported in the data 
  by the Kyoto team (vsnet-campaign-dn 1522).  The 11-th rebrightening 
  was confirmed on September 9.  The humps were seen but, eclipses 
  were not very evident (vsnet-campaign-dn 1528).  The phase of humps 
  were different from those in the last rebrightening 
  (vsnet-campaign-dn 1529).
     On all re-brightenings, the maxima of them have strictly followed 
  the smooth extension of the decline of the main superoutburst.  
  The damping nature of the oscillation may be naturally explained at 
  a constant mass-transfer to the progressively shrinking accretion 
  disk (vsnet-campaign-dn 1515). 


  IX Dra                (RA = 18h12m32s.2, Dec = +67d04'41")

    A possible outburst of 16.0mag was reported on September 8 
  by M. Reszelski (vsnet-campaign-dn 1527).


  V1548 Aql		(RA = 19h07m28s.42, Dec = +11d44'45".8)

    The object is now around 14.3mag (vsnet-campaign-nova 544).


  V803 Cen		(RA = 13h23m44.5s, Dec = -41d44'30".1)

    Reported observations during the last week indicate that 
  the oscillation again appeared between <14.2 and 13.0 
  (vsnet-campaign-dn 1492, 1510).


  V818 Sco		(RA = 16h19m55s.07, Dec = -15d38'24".5)

    The object is still active at around 12.5 (vsnet-campaign-xray 
  85, 86).


*** 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
   ".... Therefore, professionals have been granted HST time
	 during September, October and November.  It will be possible
	 to obtain both visual (through large telescopes) and UV (HST)
	 spectra of nearby SNe.  The combined data will be used to
	 verify which models of SNe are correct resulting in the most
	 valuable data yet gained in the viability of using SNe as
	 standard candles.  HST time is hard to get and it is very
	 important that as many SNe searching systems are operating
	 cooperatively during these periods. ...."
   (from [vsnet-campaign-sn 233] by M. Schwartz.
  For more detailed information, see [vsnet-campaign-sn 233]


*** General information ***

  WZ Sge
    time-series photometry presented by RIT team:
	http://spiff.rit.edu/richmond/ritobs/sep03_2001/sep03_2001.html
					[vsnet-campaign-dn 1481]
	http://spiff.rit.edu/richmond/ritobs/sep04_2001/sep04_2001.html
					[vsnet-campaign-dn 1483]

    U-band light curves by A. Henden:
	http://ftp.nofs.navy.mil/pub/outgoing/aah/phot/wzsgeui.gif
	http://ftp.nofs.navy.mil/pub/outgoing/aah/phot/wzsgeuj.gif
					[vsnet-campaign-dn 1482,1484]
    light curve presented by L. Cook:
	http://vsnet.geocities.com/lcoo/wzsge.htm
					[vsnet-campaign-dn 1485]
    nightly averaged magnitude, see [vsnet-campaign-dn 1491, 1500, 1520]
    time-series photometry by S. Kiyota, see [vsnet-campaign-data 83]
    New information on the sequence from A. Henden: [vsnet-campaign-dn 1507]
    eclipse ephemeris, see [vsnet-campaign-dn 1530]

  V2275 Cyg
    multi-color photometry by G. Sostero and A. Lepardo,
	see [vsnet-campaign-nova 515 and 547]

  XTE J1650-500
    optical images:
	http://cfa-www.harvard.edu/~pgroot/XTEJ1650-50DDS.ps
	http://cfa-www.harvard.edu/~pgroot/XTEJ1650-50OGLE.ps
    Images and spectrum by M. Gavin:
	http://home.freeuk.com/m.gavin/nsgr01_3.htm
					[vsnet-campaign-nova 533]

  V4740 Sgr
    spectrum by M. Fujii:
	http://vsnet1.harenet.ne.jp/~aikow/V4740_Sgr.gif
					[vsnet-campaign-nova 536]


(This summary can be cited.)	

Regards,
Makoto Uemura

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