Hatena::Groupkanatatmp

KANATA ObsLog

2008-12-27

[]QSO 0133+476 : update the data

f:id:kanataobslog:20081227235747p:image

We continue the observation QSO 0133+476. The object has faded.

[]3C 454.3 : update the data

f:id:kanataobslog:20081227235605p:image

We update the data of 3C 454.3. The object is still fading and the color

is becoming blue.

2008-12-24

[]S2 0109+224 : light curve and color

f:id:kanataobslog:20081224224047p:image

We continue the observation of S2 0109+224. The object has the large amplitude of the variability. The V-J color seems to correlate with the flux, it is bluer when the object is brighter.

[]OJ 287 : update the data

f:id:kanataobslog:20081224223923p:image

We update the data of OJ 287. The object has been faint. The V-J color seems correlate with the flux.

2008-12-22

[]S5 0716+714 : after the flare

f:id:kanataobslog:20081223031830p:image

The figure shows the light curve in V band and the V-J color of the object. The object was bright and blue on JD 2454800. Now, the object is brighter than that before the flare but color is redder than that before the flare.

[]3C 66A : update the data

f:id:kanataobslog:20081223031619p:image

We continue the observation of 3C 66A. The figure shows the light curve in V band and the V-J color of the object.

2008-12-19

[]QSO 0133+476 : starting the observation

f:id:kanataobslog:20081220020738p:image

We started the observation of QSO 0133+476. The flaring was detected by MISAO project on Nov. 2008. The Fermi LAT also detected the transient of this object in gamma-ray (Atel #1877). We confirmed the brightening in the V ,J and Ks bands. The luminosity of the quiescence is 18mag.(SIMBAD). The object has high polarization degrees.

[]3C 371 : update the data

f:id:kanataobslog:20081220020557p:image

We continue the observ ation of 3C 371. The figure shows the light curves of the object in V, J and Ks bands. We have thought that the amplitudes of variations in V and Ks bands might be larger than those of J band. But it might be mistake from this figure.

2008-12-18

[]3C 279: light curve and polarization

f:id:kanataobslog:20081219012730p:image

The figure shows the light curve and the polarization degree of the object of the object.

[]PKS 0422+004 : update the data

f:id:kanataobslog:20081219012208p:image

We continue the observation of PKS 0422+004. The figure shows the light curve and the kj.

2008-12-17

[]1ES 1959+650 : brightening

f:id:kanataobslog:20081218031438p:image

We continue the observation of 1ES 1959+650. The figure shows the light curve and the polarization degree of the object in V band. The object became bright. Now the object is bright state.

[] PKS 0048-097 : detection of three flare

f:id:kanataobslog:20081218023212p:image

We continue the observation of PKS 0048-097. The figure shows the light curve and the polarization degree of obeject in V band. We detect three flare. The flux of the object seems to vary periodically.

2008-12-16

[] SN 2008hy : the characteristics of subluminous SNe Ia

f:id:kanataobslog:20081217025249p:image

f:id:kanataobslog:20081217025248p:image

We have performed spectroscopic and photometric observations of Type Ia SN 2008hy. The spectroscopic characteristics suggest that SN 2008hy is similar to subluminous SNe Ia. The SiII6355 feature is not completely symmetric profile and the CaI IR triplet profile has a split structure. The MgII triplet feature is seen at 9500A. These features also are seen in subluminous SNe Ia (ex. SN 1999by, Garnavich et al. 2005). The decline rate of light curve would be larger than that of normal SNe Ia, and the I-band light curve has a small bump. We will continue the observation of SN 2008hy.

2008-12-15

[]AO 0235+164 : update the data

f:id:kanataobslog:20081215230012p:image

We update the data of AO 0235+164. The figure shows the light curve in V band and V-J color of the object.

[]S2 0109+224 : current behavior

f:id:kanataobslog:20081215225433p:image

The figure shows the light curve and the polarization degree of S2 0109+224 in V band.

2008-12-14

[] Preliminary photometric results of Type Ia SN 2008hy : reddened or dim ?

f:id:kanataobslog:20081214194024p:image

We began optical and near-infrared observations of SN 2008hy in Dec.7 2008. We had already reported the spectroscopic type identification to CBAT (CBET1610), as SN 2008hy was apparently normal SNe Ia. The multi-band light curves have declined since our observation started. Preliminary photometric results show SN 2008hy looks highly reddened. It is explained that the the reddening would be suffered from not only our galaxy (Av=0.68, Schlegel et al.1998) but also the host galaxy IC 334, like in SN 2003cg (Elias-Rosa et al. 2006) and SN 2006X (Wang et al. 2008, Yamanaka et al. 2009 submitted to PASJ). Alternatively, the color of SN 2008hy might be intrinsically red. The decline rate may be faster than those of normal SNe Ia, which is characteristics of intrinsically red SNe Ia, like SN 2004eo (Pastorello et al.2007). We will continue the multi color observations SN 2008hy.

2008-12-12

[] 3C 279 : start of the observation

f:id:kanataobslog:20081213050730p:image

We began the observation of 3C 279 on Dec. 9 2008. The light curve and the polarizaion degree of the object are shown in the figure. The object has high polarization degrees.

[] 3C 371 : light curve and polarization

f:id:kanataobslog:20081213045046p:image

We report the observation of 3C 371. The figure shows the light curve and the polarization degree of the object in V band. The polarization degree seems to correlate with the light curve.

[] Spectroscopic observations of bright Type Ic supernova 2007gr

f:id:kanataobslog:20081213014832p:image

We performed spectroscopic observations of bright supernova (SN) 2007gr. There is no hydrogen and helium line in early spectra, and the SiII6355 line absorption is shallow, which suggested that SN 2007gr is a Type Ic SN. We also confirmed strong absorptions of OI7773 and Ca IR triplet in ealry spectra, which these lines is blue-shifted due to the fast expanding photosphere.

At late phase, the hydrogen emission lines become strong at 6500A, which doesn't come from SN, it would be originated from HII region in host galaxy. The OI and CaII line emission is seen at 6300A and 7400A, respectively. The OI line may be double-peaked structure, the red component would be strong at least. The observational fact suggested that the ring-like structure material would be ejected at inner region of SN 2007gr.

2008-12-11

[] S5 0716+714 : detection of a flare

f:id:kanataobslog:20081212015941p:image

The figure shows the light curve and the polarization degree of the object in V band. The flux of the object increased by about 1.2 mag. with a flare of the polarization degree in JD 2454800.

[] OJ 287 : update the data

f:id:kanataobslog:20081212080501p:image

We update the data of OJ 287. The figure shows the light curve and the polarization degree of the object in V band.

2008-12-09

[] Photometric Observations of Supernova 2008fv

f:id:kanataobslog:20081210054103p:imagef:id:kanataobslog:20081210063413p:image

We have performed multi-color optical photometric observations of Type Ia Supernova (SN) 2008fv since Oct.2. The light curve exhibits some characteristics of a normal Type Ia SN. The B, V, R-band light curve profile around maximum are typical, and the maximum of I-band light curve precedes than that of other band, which suggested that SN 2008fv is a normal Type Ia SN. The secondary maximum of I-band light curve is seen, while the photometric observation is lacking around secondary. We will continue observation of this object.

[] 3C 66A : light curve & polarization degree

f:id:kanataobslog:20081210040655p:image

The figure shows the light curve and the polarization degree in V band. The polarization degree seems to correlate with light curve but it doesn't correlate in some days.

[] PKS 2155-304 : light curve & polarization

f:id:kanataobslog:20081210030848p:image

We continue the observation of PKS 2155-304. We report the current behavior. The figure shows the light curve and the polarization degree in V band.

2008-12-08

[] Spectroscopic identification of SN2008hy

f:id:kanataobslog:20081209031442p:image

The object was discovered in IC 334 at Dec. 6.22 by T. Puckett and A. Langoussis (CBET1608). Thereafer, we performed a spectroscopic observation of this object. The spectrum exhibits strong SiII6355 and SiII5972 absorption features, which blue-shifted by 12000km/s, respectively. The W-shape proflie feature is also seen at 520-550nm. The spectrum is similar to Type Ia SN 2007af at maximum, suggested that SN 2008hy is typical Type Ia Supernova at around maximum. We reported these results in CBET1610. The observation will continue.

2008-12-07

[] Peculiar Type IIn Supernova 2008fz: light curve

f:id:kanataobslog:20081208060534p:image

We have observed peculiar Type IIn SN 2008fz since Oct. 9. The redshift of SN 2008fz was spectroscopically determined as z=0.133 (CBET 1533). We obtained as 16.7 mag in V-band. Assuming the redshift, we estimated the absolute magnitude as -22.1! Such an extremely luminous object may be similar to SN 2006gy. But the V-band light curve decline rate of SN 2008fz would be steeper than that of SN 2006gy. On the other hand, J-band light curve would be flat. In order to reveal the origin of the conspicuous luminosity, we should continue to observe.

2008-12-06

[] 3C 454.3 : fading

f:id:kanataobslog:20081207004327p:image

The figure shows the light curve in V band and V-J color of the object. The object is still fading and color is becoming blue.

[] S2 0109+224 : update the data

f:id:kanataobslog:20081206231809p:image

We continue the observation of S2 0109+224. The object still has an large variability of the flux.

2008-12-04

[] Spectroscopic Observations of Type Ia SN 2008fv

f:id:kanataobslog:20081205015001p:image

We have performed spectroscopic observations of bright Type Ia SN 2008fv since Oct. 2. We obtained 9 specra. The broad and deep SiII6355 line was seen at 6100A in our spectra until Oct.20. The CaII IR triplet line also showed strong blue-shifts at 8200A. The both lines indicate that SN 2008fv is a normal Type Ia supernova. The observations will continue.

[] PKS 0422+004 : correlation between light curve and polarization degree??

f:id:kanataobslog:20081204223511p:image

The figure shows the light curve and the polarization degree of the object in V band. The polarization degree seems to correlate with light curve.

[] PKS 0048-097 : brightening

f:id:kanataobslog:20081204223153p:image

The figure shows the light curve and the polarization degree of the object in V band. The flux of the object increased by about 0.5 mag..

2008-12-03

[] 1ES 1959+650 : current behavior

f:id:kanataobslog:20081204012249p:image

We continue the observation of 1ES 1959+650. The figure shows the light curve and the polarization degree of the object in V band.

[] 3C 371 : update the data

f:id:kanataobslog:20081204011750p:image

We update the data of 3C 371. The figure shows the lifht curve of the object in V, J and Ks band.

blazar AO 0235+164 : update the data

f:id:kanataobslog:20081204005621p:image

The figure shows the light curve of the object in V band and the V-J color variation. The object reached about 17.5 mag and the V-J color became red.

2008-12-02

[] ON 325 : restart observation

f:id:kanataobslog:20081203021054p:image

We restart the observation of ON 325. We couldn't observe this object from July 24 when the object was a little faint. Now, the object is usual brighteness.

[] S5 0716+714 : brightening

f:id:kanataobslog:20081202230807p:image

The figure shows the light curve in V band and the V-J color of S5 0716+714. The object became bright about 1 mag.. This amplitude is larger than the flare in JD 2454750.