AST3: dwarf nova outbursts

ATel #9033; Bin Ma (NAOC), Yi Hu (NAOC), Zhaohui Shang (TJNU, NAOC), Lifan Wang (PMO, TA&MU)
on 9 May 2016; 16:13 UT
Distributed as an Instant Email Notice Novae
Credential Certification: Bin Ma (mabin22@gmail.com)

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AST3#2 OT J024453.11-580940.1 discovery - new dwarf nova outburst with ampl>5.8 The 2nd Antarctic Survey Telescope (AST3#2) discovered OT source at (RA, Dec) = 02:44:53.11 -58:09:40.1 on 2016-05-06.071 UT with Sloan-g magnitude of 15.5m (limit 18.6m). And there is no minor planet at this place. The OT was detected with the g-magnitude of 15.8 on 5.126UT, then becomes 15.6 mag on 7.184UT, and 15.7 mag on 8.589UT. The OT was not detected on 2.654UT with g-magnitude limit 17.6m, nor on 1.643UT with g-magnitude limit 18.3m. It matches a GSC 2.3.2 star with Bj=21.32, i.e. the amplitude of outburst is more than 5.8m. And there is a GALEX source in 0.4". Spectral observations are required. The discovery and reference images are available at http://aag.bao.ac.cn/mabin/varcheck/160506/rank2/diff_bi_0240-5933_160506.014335_1x1_1_1_1.jpg . AST3#2 OT J054457.27-522430.1 discovery - new dwarf nova outburst with ampl>5 The 2nd Antarctic Survey Telescope (AST3#2) discovered OT source at (RA, Dec) = 05:44:57.27 -52:24:30.1 on 2016-05-08.789 UT with Sloan-g magnitude of 16.56 (limit 18.8m). And there is no minor planet at this place. The OT becomes 17.50 mag on 9.597UT. The OT was not detected on 7.657UT with g-magnitude limit 18.6m, nor on 6.588UT with g-magnitude limit 18.9m. It matches a GSC 2.3.2 star with Bj=22.57, and a Blanco Cosmology Survey star with g=21.59, i.e. the amplitude of outburst is more than 5.8m. And there is a GALEX source in 0.5". Spectral observations are required. The discovery and reference images are available at http://aag.bao.ac.cn/mabin/varcheck/160508/rank2/diff_bi_0545-5341_160508.185642_1x1_1_1_49.jpg . AST3#2 OT J213948.19-595933.0 discovery - known dwarf nova outburst with ampl>2 The 2nd Antarctic Survey Telescope (AST3#2) discovered OT source at(RA, Dec) = 21:39:48.19 -59:59:33.0 on 2016-05-09.037UT with Sloan-g magnitude of 17.55 (limit 19.1m). And there is no minor planet at this place. The OT was not detected on 7.153UT with g-magnitude limit 18.5m, nor on 6.040UT with g-magnitude limit 18.7m. It matches a GSC 2.3.2 star with Bj=19.58. And there is a GALEX source in 2.8". There is previous outburst reported as ASASSN-14cc, when the magnitude range was 15.8 to 19.8. Spectral observations are required. The discovery and reference images are available at http://aag.bao.ac.cn/mabin/varcheck/160509/rank2/diff_bi_2141-5933_160509.005322_1x1_1_1_21.jpg .