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Date: Mon, 5 Apr 93 09:03:42 PDT
From: alex%bkyim.hepnet@Lbl.Gov (ALEX FILIPPENKO, UC BERKELEY, 510-642-1813)
Subject: SN 1993J update; sorry if you have already seen some of this.
4-5-93
Dear SN 1993J enthusiasts:
Note that there will be a workshop devoted to SN 1993J on the
first day of the upcoming IAU Symposium on Supernovae (in Xian,
China). Observers (and theorists) who might want to make a short
contribution during this workshop should contact me directly, as
I will be organizing it.
Rumor has it that there is a ROSAT detection of SN 1993J, but I
have not heard anything directly.
Here is some information that may be of use to you:
***
From Mark Kidger (La Palma; mrk@iac.dnet.nasa.gov):
I am introducing all amateur and profesional photometry that reaches me
into the computer. The light curve has a lot of scatter (eg: the
[preliminary] La Palma points from Steve Unger are all about 0.5 mags too
faint in V and lesser amounts in other filters), but various trends are
very clear. The light curve seems to have shown various phases:
1.) An initial rapid rise up to March 29th.
2.) A pronounced change of rate of rise, but linear increase in brightness to
maximum V=10.4 on March 31.
3.) A slower, but still linear decay from a very sharp maximum.
Assuming that the initial rapid rise was linear, it seems that it
started around March 25th. Does anyone have images from then I wonder?? I guess
that if there were any still around they would have been announced by now.
[Maybe not! All observers should check their records. -- Alex]
As far as comparison stars are concerned, the Guide Star 14.6 star
is catalogued (don't ask me where, I have it second hand) as a possible
variable and is not being recommended by amateurs as a good comparison star to
use.
[MORE RECENT UPDATE:}
I've added some more data to the light curve which has changed the
situation slightly, I've also looked at the estimated zero-time a little more
closely; these are my conclusions:
1.) The initial rise up to March 29.1 was 2.7 mags/day. Assuming that it start-
ed out at V=20.5 I come up with starting date for the rise of March 25.9. Ie:
that's my best estimate of when the explosion happeneded.
2.) I am having major problems with the observations from March 29-31st. I
stick by the monotonic initial rise and slow-down around March 29.0 but, then,
it's a bit more confusing. Some data from the Pacific area from about March
29.5 and 30.5 would help a lot. It seems that there may well have been a slow
rise for about 1 day, followed by a very rapid jump of about one magnitude
from about 11.2 to about 10.4 which is no seen directly. At least, there is
a sharp discontinuity in the data before and after March 30.5. It's a little
hard to tell, hjas as anyone any unpublished data from March 30.5+/-0.5?????
[ALL OBSERVERS SHOULD CHECK THEIR FILES TO SEE IF WE CAN FILL THIS GAP! -Alex]
****
Here is Mark Kidger's data table:
Profesional data (photoelectric or CCD):
Date
March+ U B V R I J H K L
28.3 -9.99 -9.99 13.80 -9.99 -9.99 -9.99 -9.99 -9.99 -9.99
29.18 -9.99 -9.99 11.20 -9.99 -9.99 -9.99 -9.99 -9.99 -9.99
30.9 9.98 10.83 10.78 -9.99 10.60 -9.99 -9.99 -9.99 -9.99
31.00 -9.99 11.05 -9.99 10.75 -9.99 -9.99 -9.99 -9.99 -9.99
31.1 10.21 10.95 10.85 10.74 10.62 -9.99 -9.99 -9.99 -9.99
31.17 -9.99 -9.99 10.31 -9.99 -9.99 -9.99 -9.99 -9.99 -9.99
31.2 -9.99 -9.99 -9.99 -9.99 -9.99 10.90 -9.99 10.60 -9.99
31.21 -9.99 -9.99 9.90 -9.99 -9.99 -9.99 -9.99 -9.99 -9.99
31.21 -9.99 -9.99 10.33 -9.99 -9.99 -9.99 -9.99 -9.99 -9.99
31.26 -9.99 -9.99 10.34 -9.99 -9.99 -9.99 -9.99 -9.99 -9.99
31.9 10.63 11.28 11.06 10.85 10.66 -9.99 -9.99 -9.99 -9.99
32.18 -9.99 -9.99 10.50 -9.99 -9.99 -9.99 -9.99 -9.99 -9.99
32.18 -9.99 -9.99 10.60 -9.99 -9.99 -9.99 -9.99 -9.99 -9.99
32.21 -9.99 -9.99 10.59 -9.99 -9.99 -9.99 -9.99 -9.99 -9.99
32.40 -9.99 -9.99 10.65 -9.99 -9.99 -9.99 -9.99 -9.99 -9.99
32.9 11.03 11.60 11.31 11.06 10.85 -9.99 -9.99 -9.99 -9.99
33.1 11.24 11.73 11.41 11.15 10.91 -9.99 -9.99 -9.99 -9.99
33.13 -9.99 -9.99 10.89 -9.99 -9.99 -9.99 -9.99 -9.99 -9.99
33.15 -9.99 -9.99 10.97 -9.99 -9.99 -9.99 -9.99 -9.99 -9.99
33.15 -9.99 -9.99 11.00 -9.99 -9.99 -9.99 -9.99 -9.99 -9.99
33.22 -9.99 -9.99 10.91 -9.99 -9.99 -9.99 -9.99 -9.99 -9.99
33.37 -9.99 -9.99 10.97 -9.99 -9.99 -9.99 -9.99 -9.99 -9.99
Amateur visual and CCD data (assumed to be V):
Date
March+
28.86 11.8
28.89 11.6
29.01 11.3
29.1 11.8
29.82 11.0
29.82 11.0
29.82 11.2
29.88 11.0
29.88 11.3
29.95 11.1
29.95 11.1
30.82 10.0
30.84 10.3
30.85 10.0
30.86 10.0
30.91 10.0
30.94 10.5
31.1 10.0
31.13 10.5
31.84 10.5
31.88 10.5
31.89 10.6
31.89 10.7
31.93 10.5
32.84 10.4
32.87 10.5
32.87 10.5
32.88 10.6
Upper limits reported to date:
Date
March+ U B V R I
25.60 -9.99 -9.99 17.5 17.5 -9.99 !V assuming neutral colour
26.9 -9.99 -9.99 14.0 -9.99 -9.99
26.92 -9.99 -9.99 14.5 -9.99 -9.99
***
From Taichi Kato (Kyoto; tkato@kusastro.kyoto-u.ac.jp"):
SN1993J photometric history
Updated list of observations obtained by Apr. 5.
Data and visual inspection of TV-monitor at Ouda tonight suggest that
the rapid decline phase may have stopped.
This table is based on that sent from B. H. Granslo (Norway).
For photoelectric photometry with mentioned comparisons, I have tried
to reduce them using suggested photometric standards rather than GSC
magnitudes. Such data are denoted as "corrected mag".
Visual observations from Japan have also been reduced using V sequences
in "Supernova Search Chart" (designated as SEQ="TB").
The compilation is only very preliminary and may contain errors.
Consult the original data sources for quantitative analysis.
Observations marked with * are communicated through this nova network.
color band: U,B,V Johnson system
R,I Kron-Cousins system unless notified
g,r Gunn g,r
mv visual (close to V)
p photographic (miscellaneous materials)
C unfiltered CCD
comparisons: TB Thompson-Bryan's "Supernova Search Chart" = V
TA "The Astronomer" sequence (system ?)
GP GSC photometric field = V
AC AAVSO chart = V?
1985 01 21. 21 r Cohen, J. G. (1.5-m, CCD) g-r=+0.9 IAUC 5742
1992 10 02. 20.0 R Salzer, J. et al. IAUC 5741
1993 02 24.687 <16.0 mv Kushida, R.
1993 03 16.542 <15.0 mv Kushida, R.
1993 03 16.90 20.0 R Prugniel, P. (CCD) IAUC 5742 several images
1993 03 23.10 20.0 R Prugniel, P. (CCD) IAUC 5742 between two dates
1993 03 21.667 <16.0 p Okamoto, Y.
1993 03 25.60 <17 R van Driel, W. (Kiso CCD) IAUC 5737
1993 03 26.9 <14.0 mv Pujol, P.; Ripero, J. IAUC 5731
1993 03 27.91 <16.0 p J.-C. Merlin, (Ektachrome 400) IAUC 5740
1993 03 28.30 13.8 C A. Neely, (unfiltered CCD) IAUC 5740
1993 03 28.86 11.8 mv Garcia, F. (25-cm f/3.9 refl.) IAUC 5731
1993 03 28.89 11.6 C Rodriguez, (20-cm f/5 refl. + ST-4 CCD)
1993 03 29.01 11.3 mv Garcia, F.
1993 03 29.019 11.2 C Ulfheden,P.; Hamberg,I. (15-cm refl+ST-6 CCD)
1993 03 29.1 11.8 C Rodriguez, CCD IAUC 5731
1993 03 29.18 11.7 C Neely, A. W. (unfiltered CCD, corrected mag)
IAUC 5742
1993 03 29.691 10.3 p Y. Hashimoto (10.5cm, Fuji SG-400, no filter)
1993 03 29.82 11.2 mv Pujol, P. IAUC 5731
1993 03 29.82 11.0 mv Ripero, J.
1993 03 29.88 11.0 C Rodriguez, D. IAUC 5731
1993 03 29.95 11.1 mv Garcia, F. IAUC 5733
1993 03 30.006 11.0: C TB Solberg, R. (40.6-cm refl. + ST-6 CCD)
1993 03 30.1 11 mv Treffers, R. R. (0.8-m, CCD) IAUC 5731
1993 03 30.25 10.2 V Hartwick, F. et al. (50-cm refl. + CCD) IAUC 5731
1993 03 30.538 10.4 mv TB Yamada, M.
1993 03 30.845 10.3: mv TA Schmeer, P. (20.3-cm SCT) IAUC 5733
1993 03 30.865 10.6 mv Poyner, G. (40-cm refl.)
1993 03 30.9 10.78 V *Unger, S. (via Filippenko) B-V=0.05
1993 03 30.9 10.83 B *Unger, S. (via Filippenko) B-V=0.05
1993 03 30.90 11.0 mv GP Midtskogen, O. (31.6-cm refl.)
1993 03 30.906 10.5 mv TB Schmeer, P. (20.3-cm SCT)
1993 03 30.916 10.6 mv Poyner, G. (40-cm refl.)
1993 03 30.93 10.5 mv TA Bengtsson, H. (15-cm refl.)
1993 03 30.94 10.5 mv Shanklin, J. D. IAUC 5736
1993 03 30.989 10.6 mv Poyner, G. (40-cm refl.)
1993 03 31.00 11.05 B Prugniel, P. (0.8-m, CCD) B-R=+0.3 IAUC 5736
1993 03 31.00 10.75 R Prugniel, P. (0.8-m, CCD) B-R=+0.3 IAUC 5736
1993 03 31.1 10 mv Kohl, R. (independent discovery) IAUC 5736
1993 03 31.1 10.85 V *Unger, S. (via Filippenko) B-V=0.10
1993 03 31.1 10.95 B *Unger, S. (via Filippenko) B-V=0.10
1993 03 31.13 10.6 mv GP Midtskogen, O. (31.6-cm refl.)
1993 03 31.13 10.5 mv Caimciolo, F. IAUC 5736
1993 03 31.17 10.79 V Balonek, T. J. et al., CCD
corrected mag IAUC 5746
1993 03 31.2 10.7 R Salzer, J. et al. IAUC 5741
1993 03 31.21 10.81 V Neely, A. W. (corrected mag) IAUC 5742
1993 03 31.21 10.4 C Neely, A. W. (unfiltered CCD, corrected mag)
IAUC 5742
1993 03 31.26 10.82 V Balonek, T. J. et al., CCD,
corrected mag IAUC5746
1993 03 31.424 10.5 mv TB Yamada, M.
1993 03 31.440 10.5 mv TB Yamada, M.
1993 03 31.576 10.5 mv TB Kato, T.
1993 03 31.84 10.5 mv Zanotta, M. V. and Pesci, S. IAUC 5737
1993 03 31.9 11.06 V *Unger, S. (via Filippenko) B-V=0.22
1993 03 31.9 11.28 B *Unger, S. (via Filippenko) B-V=0.22
1993 03 31.961 10.97 V Hanzl, D. B-V=+0.33 IAUC 5742
1993 03 31.961 11.30 B Hanzl, D. B-V=+0.33 IAUC 5742
1993 03 31.972 11.06 V Sostero, G. et al. B-V=0.35 IAUC 5741
1993 03 31.972 11.41 B Sostero, G. et al. B-V=0.35 IAUC 5741
1993 04 01.00 11.40 B Prugniel, P. (CCD) B-R=+0.45 IAUC 5741
1993 04 01.00 10.95 R Prugniel, P. (CCD) B-R=+0.45 IAUC 5741
1993 04 01.055 10.4 mv Beauchamp, D. (20.3-cm SCT, 100x)
1993 04 01.08 10.7 mv Schmeer, P. (IAUC 5740)
1993 04 01.18 11.08 V Neely, A. W. (corrected mag) IAUC 5742
1993 04 01.18 11.0 C Neely, A. W. (unfiltered CCD, corrected mag)
IAUC 5742
1993 04 01.21 11.07 V Balonek, T. J. et al., CCD,
corrected mag IAUC 5746
1993 04 01.40 11.13 V Balonek, T. J. et al., CCD,
corrected mag IAUC 5746
1993 04 01.453 10.5 mv TB Takahashi, S.
1993 04 01.465 10.5 mv TB Iida, M.
1993 04 01.538 10.4 mv TB Kato, T.
1993 04 01.58 10.8 p TB Kushida (40cm Fuji SuperG400, no filter)
1993 04 01.604 11.0 mv TB Kiyota, S.
1993 04 01.622 10.4 mv TB Watanabe, Y.
1993 04 01.632 11.2 mv Shioi, H.
1993 04 01.633 10.5 p Kushida, Y. (Tri-X no filter)
1993 04 01.660 11.21 V Okyudo, M. (CCD)
1993 04 01.726 11.0 mv TB Watanabe, T.
1993 04 01.750 11.0 mv TB Koyama, H.
1993 04 01.785 10.8 p TB Koyama, H. (GX 3200, no filter)
1993 04 01.795 10.5 mv TB Hirosawa, K.
1993 04 01.803 10.7 mv AC Schmeer, P. (20.3-cm SCT)
1993 04 01.81 10.5 mv Vanmunster, T. (IAUC 5740)
1993 04 01.86 11.32 V Mikolajewski, M., B-V=0.26, V-R=0.37, V-I=0.37,
1993 04 01.86 11.58 B Mikolajewski, M., B-V=0.26, V-R=0.37, V-I=0.37,
1993 04 01.86 10.95 R Mikolajewski, M., B-V=0.26, V-R=0.37, V-I=0.37,
1993 04 01.86 10.95 I Mikolajewski, M., B-V=0.26, V-R=0.37, V-I=0.37,
IAUC 5742
1993 04 01.816 11.19 V Hanzl, D. B-V=0.32, IAUC 5742
1993 04 01.9 11.31 V *Unger, S. (via Filippenko) B-V=0.29
1993 04 01.9 11.60 B *Unger, S. (via Filippenko) B-V=0.29
1993 04 02. 10.6 mv TB Kratz, D. (20-cm f/3.5 refl.)
1993 04 02.1 11.41 V *Unger, S. (via Filippenko) B-V=0.32
1993 04 02.1 11.73 B *Unger, S. (via Filippenko) B-V=0.32
1993 04 02.13 11.37 V Balonek, T. J. et al., CCD,
corrected mag IAUC 5746
1993 04 02.15 11.45 V Neely, A. W. (corrected mag) IAUC 5742
1993 04 02.15 11.5 C Neely, A. W. (unfiltered CCD, corrected mag)
IAUC 5742
1993 04 02.22 11.39 V Balonek, T. J. et al., CCD,
corrected mag IAUC 5746
1993 04 02.37 11.45 V Balonek, T. J. et al., CCD,
corrected mag IAUC 5746
1993 04 02.439 11.0 mv TB Yamada, M.
1993 04 02.453 10.9 mv TB Takahashi, S.
1993 04 02.494 11.50 V Kato, T. (CCD)
1993 04 02.611 11.78 B Kato, T. (CCD)
1993 04 02.637 11.08 I Kato, T. (CCD)
1993 04 02.585 11.1 mv TB Watanabe, M.
1993 04 02.608 11.5 mv TB Sakuma, S.
1993 04 02.716 10.6 mv TB Abe, S.
1993 04 02.843 11.3 mv Poyner, G. (40-cm refl.)
1993 04 02.867 11.3 mv TB Granslo, B. H. (20.3-cm SCT, 123x)
1993 04 02.95 11.5 mv TA Bengtsson, H. (15-cm refl.)
1993 04 03.011 11.2 mv TB Granslo, B. H. (20.3-cm SCT, 123x)
1993 04 03.448 11.3 mv TB Takahashi, S.
1993 04 03.555 11.76 V Kato, T. (CCD)
1993 04 03.561 12.09 B Kato, T. (CCD)
1993 04 03.574 11.15 I Kato, T. (CCD)
1993 04 03.574 11.5 mv TB Takahashi, S.
1993 04 03.66 11.8 mv TB Kushida, R.
1993 04 03.68 11.9 mv TB Kushida, Y.
1993 04 04.029 11.6 mv TB Schmeer, P.
1993 04 05.120 11.9 mv TB Schmeer, P.
1993 04 05.431 11.8 mv TB Takahashi, S.
1993 04 05.437 12.2 mv TB Kiyota, S.
1993 04 05.517 12.0 mv TB Kushida, Y.
1993 04 05.517 12.0 mv TB Kushida, R.
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