A search for high energy neutrinos from SN 1987A, the Carb, Hercules X-1, and Cygnus X-3 with the Fréjus detector

With the Fréjus detector we studied four astrophysical point-like sources by using <img src="/fulltext-image.asp?format=htmlnonpaginated&src=P7534L741254J854_html\10052_2005_Article_BF01554469_TeX2GIFIE1.gif" border="0" alt=" $$v_e (\bar v_e )$$ " /> and <img src="/fulltext-image.asp?format=htmlnonpaginated&src=P7534L741254J854_html\10052_2005_Article_BF01554469_TeX2GIFIE2.gif" border="0" alt=" $$v_\mu (\bar v_\mu )$$ " /> interactions in the detector and <img src="/fulltext-image.asp?format=htmlnonpaginated&src=P7534L741254J854_html\10052_2005_Article_BF01554469_TeX2GIFIE3.gif" border="0" alt=" $$v_\mu (\bar v_\mu )$$ " /> interactions in the surrounding rock. No excess of events was found. Therefore upper limits of neutrino fluxes and source luminositics are quoted. These limits confirm results from other experiments. In addition new limits are presented for spectral indices above 3.