{
  "bibcode": "2015GCN.18494....1L",
  "body": "V.M. Lipunov (Lomonosov Moscow State University, SAI MSU), E.S. Gorbovskoy\n(SAI Lomonosow MSU), R.Rebolo (IAC), N.Budnev (API Irkutsk State Uni),\nA.Tlatov (Kislovodsk Solar Station, Pulkovo), V.V.Yurkov (Blagoveschensk\nState Pedagogical University)\n and D. Buckley(SAAO) behalf MASTER-team.\n\nMASTER-Net of robotic telescope spent a great sky survey for research LVC\ntrigger G194575.\nWe have not received an automatic socket messages through GCN.\nTherefore, we were not able to immediately start automatically survey\ninside error box  and began  it in the manual mode at 2015-10-22 23:17:52\non the MASTER-Kislovodsk telescope,\nwhich at that time had suitable weather condition. In the subsequent time\nMASTER-II  telescopes SAAO (South Africa), IAC (Tenerife), Tunka (Baykal),\nBlagoveschensk and Kislovodsk  cover approximately 9000 sq. degree of sky\ndue to very flat probability distributuion (which actually includes all the\nsky).  The observations inside on the lobe nead 1 h RA  were greatly\ncomplicated by the proximity of the moon. It was finally covered 87% of the\nlobe nead 1 h RA and 14% of full probability. The remaining 13% of 1h lobo\nare overexposed background light of the moon. 3 sigma upper limit in our\nsurvey ranged from 17 to 20 depending on the distance to the moon and\nweather conditions. The best limit, which is obtained in our survey shows\na color on a coverage map:\n\nhttp://master.sai.msu.ru/static/G194575/limits2.png\n\nWe found following transitents during this survey:\n\n\n\n1) MASTER OT J194142.51-563815.7 discovery ��� dwarf nova outburst, Amplitude\nmore then 4.9m.\n\nMASTER-SAAO auto-detection system discovered OT source at (RA, Dec) = 19h\n41m 42.51s -56d 38m 15.7s on 2015-10-25.80803 UT.\nThe OT unfiltered magnitude is m_OT=17.1 (the limit is 18.5m, 6 images),\nm_OT=17.4 on 2015-10-26 18:38:50.366UT(2 images). There is no minor planet\nat this place. We have reference image without OT on 2015-03-23.04023 UT\nwith unfiltered magnitude limit 20.2m.\nThere is no known optical source at this place (VIZIER database, POSS limit\nis 22m). There is only Allwise source with W1=17.109, W2=17.373, W3=12.745.\nSo there is a dwarf nova outburst with Amplitude more then 4.9m.\n\nThe discovery and reference images are available at:\nhttp://master.sai.msu.ru/static/OT/194142.51-563815.7_1.png\n\n2) MASTER OT J184709.24-495633.9 discovery ��� dwarf nova outburst with\nAmplitude more then 3.4m\n\nMASTER-SAAO auto-detection system discovered OT source at (RA, Dec) = 18h\n47m 09.24s -49d 56m 33.9s on 2015-10-25.79044 UT.\nThe OT unfiltered magnitude is 17.2m (limit is 18.3m, 4 images). There is\nno minor planet at this place.\nMASTER-SAAO reobserved it on 2015-10-26 18:06:20.857 , m_OT=17.7 (2\nimages). We have reference image without OT on 2015-02-17.102UT with\nunfiltered magnitude limit 19.4m. There is USNO B1 star with B2=20.83,\nR2=20.58. So there is classic dwarf nova outburst with amplitude more then\n3.4m.\nThe discovery and reference images are available at\nhttp://master.sai.msu.ru/static/OT/184709.24-495633.9.png\n\n\n3) MASTER OT J020836.79-104018.8 discovery\n\nMASTER-IAC auto-detection system discovered OT source at (RA, Dec) = 02h\n08m 36.79s -10d 40m 18.8s on 2015-10-23.07405 UT.\nThe OT magnitude in I-band is 17.0m (limit 18.4m). The OT is seen in 3\nimages. There is no minor planet at this place. We have reference image\nwithout OT on 2015-10-21.07257 UT with unfiltered magnitude limit 21.1m.\n\nThere is 2MASS and WISE source with J=14.873, H=14.243, K=13.851\nhttp://vizier.u-strasbg.fr/viz-bin/VizieR?-source=&-out.add=_r&-out.add=_RAJ%2C_DEJ&-sort=_r&-to=&-out.max=20&-meta.ucd=2&-meta.foot=1&-c=32.153291666667+-10.671888888889&-c.rs=5\n\nThe discovery and reference images are available at:\nhttp://master.sai.msu.ru/static/OT/020836.79-104018.8.png\n\n\n4). MASTER OT J060553.93+283325.6 discovery  -dwarf nova outburst with\nAmplitude more then 3.9m\n\nMASTER-Tunka auto-detection system discovered OT source at (RA, Dec) = 06h\n05m 53.93s +28d 33m 25.6s on 2015-10-25.75079 UT.\nThe OT unfiltered (W=0.2B+0.8R, calibrated to USNO-B) magnitude is 15.5m\n(the limit is 18.0m).\nThe OT is seen in 9 images.\nWe have reference image without OT on 2013-12-01.66689 UT with unfiltered\nmagnitude limit 18.9m.\nThere is USNO-B1 star with B2=20.53,R2=19.10,I=17.9, no JHK, so this OT is\ndwarf nova outburst with Amplitude more then 3.9m.\n\nSpectral observations are required. The discovery and reference images are\navailable at\nhttp://master.sai.msu.ru/static/OT/MASTEROTJ060553.93+283325.6.jpg\n\n\n5). MASTER-IAC automaticaly found the QUEST optical transient reported by\nGCN Circ.18473 (Rabinovich et al.) inside the LIGO error region for trigger\nG194575.\n\nMASTER-IAC auto-detection system detected OT source at (RA, Dec) = 00h 11m\n27.62s -06d 25m 38.0s on 2015-10-26.97009 UT  with unfiltered magnitude\nm_OT= 17.0 m +-0.3 (W=0.2B+0.8R calibrated to USNO-B1). Photometry is not\nvery good because proximity of the Moon.\n\nThe OT is seen in 5 images. There is no minor planet at this place. We have\nreference image without OT on 2015-10-09.09056 UT with 19.9 unfiltered\nmagnitude limit.",
  "circularId": 18494,
  "createdOn": 1445964462000,
  "email": "lipunov2007@gmail.com",
  "eventId": "LIGO/Virgo G194575",
  "subject": "LIGO/Virgo G194575: MASTER Optical Inspection",
  "submitter": "Vladimir Lipunov at Moscow State U/Krylov Obs  <lipunov2007@gmail.com>"
}