NGC 2366 : An optical search for possible supernova remnants
  The results of an optical search for supernova remnants (SNRs) in the nearby
irregular galaxy NGC 2366 are presented. We took interference filter images and
collected spectral data in three epochs with the f/7.7 1.5 m Russian Turkish
Telescope (RTT150) at T\"{U}B\.{I}TAK National Observatory (TUG) located in
Antalya, Turkey. The continuum-subtracted H$\alpha$ and continuum-subtracted
[SII]$\lambda \lambda$6716, 6731 images and their ratios were used for the
identification of SNRs. With [SII]/H$\alpha$ $\geq$ 0.4 criteria, four possible
SNR candidates were identified in NGC 2366 with [SII]/H$\alpha$ ratios of
$\sim$(0.68, 0.57, 0.55 and 0.75), H$\alpha$ intensities of $\sim$(2.10, 0.36,
0.14, 0.11)$\times 10^{-15}$ erg cm$^{-2}$ s$^{-1}$
[SII]$\lambda$6716/$\lambda$6731 average flux ratios of $\sim$(1.01 and 1.04),
electron densities of $N_{\rm e}$ $\sim$(582 and 513) cm$^{-3}$ and [OIII]
$\lambda$5007/H$\beta$ $\lambda$4861 $\sim$(3.6 and 2.6) line ratio values are
obtained for two of the SNR candidates. A shock velocity $V_{\rm s}$ of 80
$\leq$ $V_{\rm s}$ $\leq$ 100 km s$^{-1}$ is reported. The spectral parameters
are obtained for the first time for these possible SNR candidates. The
locations of the four SNRs obtained here are found to be consistent with
optical and radio results reported so far. One of the sources categorised
earlier by XMM-Newton observations as an extended X-ray source position is
found to be consistent with one of four possible SNR candidates reported here.
