We present our near-real-time discoveries of ongoing transients (mainly supernovae, SNe) in the ~700 sq. deg. footprint of the OGLE-IV survey of the Magellanic System. With the average cadence of 3 days in the I-band filter, we discover annually 150 high quality SN candidates inside approximately 23.5h < RA < 6.3h and -80 deg < Decl. < -62 deg. All the transients are brighter than I<20.5 mag.
If you point to our discoveries in your publications (papers, ATels, CBATs, posters), we would highly appreciate acknowledging the OGLE-IV Transient Detection System (OTDS) by citing Wyrzykowski et al. ATEL #4495, Kozłowski et al. 2013, Acta Astronomica, 63, 1 and Wyrzykowski et al. 2014. Pointer to our transient website http://ogle.astrouw.edu.pl/ogle4/transients/ would be also greatly appreciated. The technical details and results from the first two seasons is presented in a paper Wyrzykowski et al. 2014.
For each candidate below, the panels show (from left to right):|
1) its light curve in I-band (upper limits marked with arrows),
Green V letters mark epochs with existing V-band images, however, the V-band photometry will be produced somewhat later.
2) its reference image (160''x160'', N is up, E is to the left),
3) maximum brightness image (or last available), and
4) the difference image between 2) and 3).
For each transient below there is: the transient's full designation
(allowed shortening: SN OGLEyy-nnn),
date and time of maximum brightness, internal OGLE DB ID (N suffix
indicates the object was new, no suffix means an outburst on an old object), discovery HJD,
discovery I mag, spectral classification (if available) with the hyperlink.|
The light curve displays only the last 100 days from the maximum brightness. The light curve plot (CLICKABLE!) links to all available photometric data containing columns: JD, I-band mag, error mag, seeing, background. Note, the data are only roughly calibrated to about 0.2 mag. Machine readable information on all transients is stored in the ASCII file transients.txt. Columns: id, OGLE DBid, ra, dec (hex), ra, dec (deg), HJDmax, magmax, date max, HJD of the last frame, last magnitude, date of last frame, discovery channel (N/O), x,y on full ref.image.
The false-color template cutout (2x2 arcmin) is produced from I and V if both templates are available - still in beta version!
From 25.Oct 2013 all photometry shows a net flux measured on subtracted images, i.e. it does not contain the background flux. For some transients detected on top of galaxies their observed magnitude will be brighter than stated here.
DISCLAIMER: All data are provided here for informative purposes only. Any scientific and publication use of the OGLE data (provided light curves) should be consulted with us.