CBAT
This webpage is based on the M31 webpage also run by the CBAT. This webpage was begun in 2009 to address the reports of apparent M81 novae sent to the CBAT. To warrant inclusion here, we go by the same rules that govern assignment of supernova and nova designations -- namely, that multiple nights of observations must be reported (excepting where multiple observatories report confirming observations on a single night, or spectroscopy is immediately available). This page is patterned after the CBAT's Unconfirmed Supernovae webpage.
An asterisk (*) after the designation in the table below indicates that the object has been shown to not be a nova (see the associated notes).
The observations of apparent novae in M81 are listed below in plain ASCII text (with NO tabs!) in a 98-column format. The designation scheme is M81N YYYY-MMa, where YYYY is the year and MM is the 2-digit month of discovery, and 'a' is a lower-case letter (a, b, c, etc.) representing the order of discovery within that month; note that multiple lines for the same object are tabulated when there is more than one independent discovery of a particular nova (i.e., one line per discovery report). Note the following template to guide you in producing a similar list to send for inclusion.
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M81N DATE (UT) R.A. (2000.0) Decl. Mag. OFFSET REPORTER
YYYY-MMa YYYY MM DD.DDD hh mm ss.ss +oo '' ""." MM.MLx rrrD rrrD Person sending text
Above, the date (given as year, month, date in Universal Time) should be given to 0.01 or 0.001 day, with leading zeroes if appropriate, in columns 12-25. The right ascension (columns 28-38) and declination (columns 40-50) should be given to full precision (0s.01 in R.A. and 0".1 in Decl.), with leading zeroes if appropriate. The magnitude should be given to tenths in columns 53-56, with column 57 for the bandpass (and column 58 for any additional bandpass character); use usual upper- and lower-letter band letters, "H" for H-alpha narrowband magnitudes, and use "U" for unfiltered CCD. The offset (columns 60-64 for right ascension and columns 66-70 for declination) of the new object from the center of M81 should be given in arc seconds for both R.A. and Decl., with the values given to 0".1 and the directional letters (E = east = 90 degrees clockwise from north toward south, and W = west for R.A. offsets; N = north and S = south for Decl. offsets) specified. The person(s) who actually send the e-mail with the discovery should be placed (first initial, full last name) in columns 75-93. Columns 95-98 contains the number for the note that will contain additional information (including the name of the survey, any other contributing astronomers, and important succinct details regarding reference images and their dates and limiting magnitudes, etc.); the appropriate sequential designation number and letter will be added by the webmaster.
For reference, the nucleus or core of M81 is located at R.A. = 9h55m33s.2, Decl. = +69o03'55" (equinox 2000.0; according to measurements by M. M. Kasliwal et al. and by K. Hornoch for M81N 2008-12a and M81N 2008-12b and their offsets for the galaxy center).
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M81N DATE (UT) R.A. (2000.0) Decl. Mag. OFFSET REPORTER
2003-02a 2003 02 09.4 09 55 48.59 +69 03 04.3 17.8U 83E 51S W. Li
2007-04a 2007 04 08.874 09 55 28.58 +69 04 21.6 19.2U 25W 26N K. Hornoch
2007-04b 2007 04 11.865 09 55 31.30 +69 05 28.9 19.9U 10W 94N K. Hornoch
2008-03a 2008 03 02.775 09 55 58.31 +69 06 07.9 20.3U 135E 133N K. Hornoch
2008-09a 2008 09 25.49 09 55 59.35 +69 05 57.1 19.5g 141E 122N M. M. Kasliwal
2008-12a 2008 12 03.303 09 55 16.92 +69 02 17.7 20.5g 87W 97S M. Kasliwal
2008-12a 2008 12 09.164 09 55 16.79 +69 02 17.4 20.7U 88W 98S K. Hornoch
2008-12b 2008 12 29.202 09 55 38.30 +69 01 43.2 18.6U 28E 132S K. Hornoch
NOTES:
(2003-02a) Discovered by D. Weisz and W. Li (University of California) on unfiltered KAIT
images. Spectroscopy by A. Filippenko and R. Chornock on Feb. 27 shows it to be a nova.
Details on IAUCs 8069 and 8086.
(2007-04a) Discovered by K. Hornoch et al. on images taken by P. Cagas. Details on CBET 924.
(2007-04b) Discovered by K. Hornoch et al. on images taken by P. Cagas. Spectroscopy by
J. Silverman et al. on Apr. 15 showed a nearly featureless blue continuum with wide H-alpha
absorption. Details on CBETs 924 and 938.
(2008-03a) Discovered by K. Hornoch. Details on CBET 1281.
(2008-09a) Discovered by M. M. Kasliwal et al. Spectroscopy shows it to be a "Fe II"-type
nova. Details on CBET 1528.
(2008-12a) Discovered by M. M. Kasliwal et al.,
and independently by Kamil Hornoch (details on CBET 1632).
(2008-12b) Discovered by Kamil Hornoch (details on CBET 1653).
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