//////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 20857 SUBJECT: IceCube-170312A - IceCube update on a high-energy neutrino candidate event DATE: 17/03/13 02:29:21 GMT FROM: Erik Blaufuss at U. Maryland/IceCube Erik Blaufuss (U. of Maryland) reports on behalf of the IceCube Collaboration (http://icecube.wisc.edu/). On 03 March, 2017 IceCube detected a track-like, very-high-energy event with a possibility of being of astrophysical origin. The event was identified by the High Energy Starting Event (HESE) selection. The IceCube detector was in a normal operating state. HESE events have a neutrino vertex inside of the detector (to reduce background) and have a high light level (a proxy for energy). After the initial automated alert (https://gcn.gsfc.nasa.gov/notices_amon/65274589_129281.amon), more sophisticated reconstruction algorithms have been applied offline, with the direction refined to: Date: 2017-03-12 Time: 13:49:39.83 UT RA: 305.15 deg (<+/- 0.5 ra uncertainty> deg 90% PSF containment) J2000 Dec: -26.61 deg (<+/- 0.5 dec uncertainty> deg 90% PSF containment) J2000 Additionally, after closer inspection of the event details, it shows signs of being consistent with rare atmospheric muon background events that are expected from the realtime event selection. The IceCube Neutrino Observatory is a cubic-kilometer neutrino detector operating at the geographic South Pole, Antarctica. The IceCube realtime alert point of contact can be reached at roc@icecube.wisc.edu //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 20890 SUBJECT: IceCube-170312A: Swift-XRT observations DATE: 17/03/17 14:59:20 GMT FROM: Azadeh Keivani at PSU A. Keivani (PSU), P.A. Evans (U. Leicester), J.A. Kennea (PSU), D.B. Fox (PSU), G. Tesic (PSU), D.F. Cowen (PSU), J.P. Osborne (U. Leicester) and M.W.E. Smith (JPL) report on behalf of the Swift-IceCube collaboration: Swift has observed the field of the IceCube HESE neutrino, IceCube-170312A (https://gcn.gsfc.nasa.gov/gcn3/20857.gcn3), utilizing the on-board 19-point tiling pattern to cover a region centered on RA,Dec (J2000) = (304.7300, -26.2380), with a radius of approximately 0.8 degrees. Swift-XRT collected ~800 s per field of PC mode data per tile. The observations were taken between 15:51:22 on 2017-03-12 and 05:04:48 on 2017-03-13 (i.e. from 7.3 ks to 54.9 ks after the neutrino trigger), and covered 2.1 square degrees. Five X-ray sources are detected in the observations. One of these corresponds to a known X-ray emitter, and others are faint objects well below the RASS limits, therefore we do not consider any of them to be likely counterparts to the IceCube trigger. We conclude that we have not discovered a transient X-ray event associated with the IceCube trigger. The 3-sigma upper limit on the count rate in the rest of the field is 0.01 ct s^-1, which corresponds to a 0.3-10 keV flux of 4.1e-13 erg cm^-2 s^-1 for a typical AGN spectrum (NH=3e20cm^-2, Gamma=1.7). Overlaps between the different tiles accounts for 0.5 square degrees: in these regions the 3-sigma upper limit is .007 ct s^-1, corresponding to 2.9e-13 erg cm^-2 s^-1. Details of the five detected X-ray sources are below. All fluxes are 0.3-10 keV and assume the same AGN spectrum as above. Source 1 ======== RA: 20h 21m 21.41s = 305.33920d Dec: -26d 01' 32.3" = -26.02565d Error: 6.3 arcsec (90% confidence radius) Count rate: (2.8 [+0.8, -0.7]) x 10^-2 ct s^-1 Flux: (1.1 [+0.3, -0.2]) x 10^-12 erg cm^-2 s^-1 Notes: Matches known X-ray source: 1RXS J202121.5-260149 (from ROSAT/RASSFSC), 16.7102046720847" away. Source 2 ======== RA: 20h 21m 54.52s = 305.47717d Dec: -26d 04′ 12.0″ = -26.07000d Error: 4.9 arcsec (90% confidence radius) Count rate: (2.1 +/- 0.6) x 10^-2 ct s^-1 Flux: (8.6 +/- 2.5) x 10^-13 erg cm^-2 s^-1 Source 3 ======== RA: 20h 18m 26.48s = 304.61032d Dec: -26d 50′ 24.6″ = -26.84017d Error: 6.5 arcsec (90% confidence radius) Count rate: (1.0 [+0.6, -0.4]) x 10^-2 ct s^-1 Flux: (4.1 [+2.5, -1.6]) x 10^-13 erg cm^-2 s^-1 Source 4 ======== RA: 20h 16m 34.69s = 304.14452d Dec: -26d 38′ 56.6″ = -26.64904d Error: 5.8 arcsec (90% confidence radius) Count rate: (1.6 [+0.6, -0.5]) x 10^-2 ct s^-1 Flux: (6.6 [+2.5, -2.1]) x 10^-13 erg cm^-2 s^-1 Source 5 ======== RA: 20h 19m 25.94s = 304.85809d Dec: -26d 06′ 09.9″ = -26.10276d Error: 5.5 arcsec (90% confidence radius) Count rate: (6.4 [+3.5, -2.6]) x 10^-2 ct s^-1 Flux: (2.6 [+1.4, -1.1]) x 10^-12 erg cm^-2 s^-1 [GCN OPS NOTE(17mar17): Per author's request, the Subject line now includes the event designation and the type of observation.] //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 20903 SUBJECT: IceCube-170312A: MASTER follow-up observations DATE: 17/03/18 10:12:27 GMT FROM: Vladimir Lipunov at Moscow State U/Krylov Obs N.V.Tyurina, V.M. Lipunov, E.S. Gorbovskoy, A.S.Kuznetsov, P.Balanutsa, V.V.Vladimirov, V.V.Chazov, D.Kuvshinov Lomonosov Moscow State University, Sternberg Astronomical Institute D.Buckley, S. Potter, A.Kniazev, M.Kotze, South African Astronomical Observatory R. Rebolo, M. Serra-Ricart, N. Lodieu, G. Israelian, L. Suarez-Andres The Instituto de Astrofisica de Canarias K.Ivanov, O.Gress, N.M.Budnev, S.Yazev, O.Chuvalaev, V.A.Poleshchuk, Irkutsk State University A. Tlatov, V.Senik, D. Dormidontov, Kislovodsk Solar Station of the Pulkovo Observatory H. Levato, C. Saffe, Instituto de Ciencias Astronomicas, de la Tierra y del Espacio (ICATE) R. Podesta, C. Lopez, F.Podest Observatorio Astronomico Felix Aguilar (OAFA) A.Gabovich, V.Yurkov, Yu.Sergienko Blagoveschensk Educational State University, Blagoveschensk MASTER Global Robotic Net was starting inspection of IceCube HESE neutrino alert IceCube-170312A (Blaufuss et al. GCN #20857: RA(2000)= 305.15 -26.61, Triggertime= 2017-03-12 13:49:39.83 UT) on 2017-03-13 02:06:34UT at MASTER-SAAO (Object: Altitude: 20.35, Sun: Altitude: -30.72,Dist. to Moon: 123.282677, Moon disk: 0.997328) and on 2017-03-14 08:38:51UT at MASTER-OAFA (Object: Altitude: 27.61, Sun: Altitude: -25.02,Dist. to Moon: 107.465652, Moon disk: 0.968195). MASTER-II is 2x4sq.degrees (Lipunov et al., 2010, Advances in Astronomy, 2010, 30L) At alert time the state at MASTER observatories are: MASTER-Amur Object: Altitude: -61.72 Sun: Altitude: -37.55 MASTER-Tunka Object: Altitude: -64.60 Sun: Altitude: -25.23 MASTER-Kislovodsk Object: Altitude: -35.78 Sun: Altitude: 13.57 MASTER-SAAO Object: Altitude: 11.19 Sun: Altitude: 37.97, inspect on13 Mar, mlim=19.2, 20 images MASTEC-IAC(Tenerife) Object: Altitude: 13.06 Sun: Altitude: 57.41 MASTER-OAFA(Argentina) Object: Altitude: 84.05 Sun: Altitude: 39.69, inspect on 13,19 Mar, mlim=18.5-19.1, 16 images MASTER auto-detection software doesn't detect optical transient, that can be connected with IC alert. We analized SWIFT Xray sources (Keivani et al., GCN#20890) 1) 20 21 21.41 -26 01 32.3 There is no optical sources up to unfiltered mlim=19.2 during MASTER-SAAO inspection of this IC170312 alert on 2017-03-13 02:37:14UT, and mlim=18.5 (2017-03-14 08:38:51UT), mlim=18.7(2017-03-18 07:38:23UT) in MASTER-OAFA . There is a faint MASTER optical detection with m<< (unfiltered mlim=19.9) in MASTER-IAC database on 2016-07-28 00:13:46UT. The nearest optical source in VIZIER database is in 5.5", also GALEX source(offset is 6.7"). 2)20 21 54.52 -26 04 12.0 There is a variable optical source in MASTER database (17.5-18.7 MASTER-IAC, MASTER-SAAO) with m_OT=18.3 on 2017-03-13 02:59:57.059UT (MASTER-SAAO) There is a GALEX source in 2.6", also optical (USNO,etc) and possible AGN (Secrest+, 2015). http://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=305.47716666667+-26.07&-c.rs=5 3) 20 18 26.4s -26 50 24.6 Variable optical source in MASTER database : m_OT=18.7 on 2017-03-13 02:59:57.059UT (MASTER-SAAO) 17.8(2016-10-21 00:34:28.062UT) - 18.8 (2017-03-18 07:34:39.474) MASTER-OAFA 4) 20 16 34.69 -26 38 56.6 There is no optical sources brighter then unfiltered mlim=19.2 during MASTER-SAAO inspection on 2017-03-13 02:24:33UT, and in archive images in MASTER-IAC on 2016-07-11 01:42:30UT with mlim=20.2 There is no sources in VIZIER 5) 20 19 25.94 -26 06 09.9 There is an optical source in MASTER-SAAO with m_OT~19.3 (mlim=19.5) There is USNO-B1 star with R1=19.20, B2=20.44 in 1.6", also candidate to AGN (Secrest+, 2015). http://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=304.85808333333+-26.10275&-c.rs=5 The message may be cited.