//////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 22105 SUBJECT: IceCube-171106A - IceCube observation of a high-energy neutrino candidate DATE: 17/11/06 22:37:07 GMT FROM: Ignacio Taboada at Georgia Inst of Tech The IceCube Collaboration (http://icecube.wisc.edu/) reports: On November 6, 2017 IceCube detected a track-like, very-high-energy event with a high probability of being of astrophysical origin. The event was identified by the Extremely High Energy (EHE) track event selection. The IceCube detector was in a normal operating state. EHE events typically have a neutrino interaction vertex that is outside the detector and produce a muon that traverses the detector volume, and have a high light level (a proxy for energy). After the initial automated alert (https://gcn.gsfc.nasa.gov/notices_amon/17569642_130214.amon), more sophisticated reconstruction algorithms have been applied offline, with the direction refined to: Date: 17/11/06 (yy/mm/dd) Time: 18:39:39.21 UT RA: 340.00 (-0.50/+0.70 deg 90% PSF containment) J2000 Dec: +7.40 (-0.25/+0.35 deg 90% PSF containment) J2000 Initial offline analysis of this event indicates that the event is consistent with being produced by a neutrino with energy in excess of 1 PeV. The initially reported signalness and energy values are likely underestimated. As indicated in the initial notice, the neutrino candidate is temporally close to Fermi GBM trigger 531686417. However, recently, Fermi GBM has been triggering frequently on a galactic source that is not spatially coincident with the event reported here. We encourage follow-up by ground and space-based instruments to help identify a possible astrophysical source for the candidate neutrino. 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: 22109 SUBJECT: INTEGRAL observation of IceCube-171106A DATE: 17/11/08 15:32:54 GMT FROM: Volodymyr Savchenko at ISDC,U of Geneve V. Savchenko, C. Ferrigno (ISDC, University of Geneva, CH) P. Ubertini, A. Bazzano, L. Natalucci. J. Rodi (INAF IAPS-Roma, Italy) S. Mereghetti (INAF IASF-Milano, Italy) P. Laurent (CEA, Saclay, France) E. Kuulkers (ESAC/ESA, Madrid, Spain) Using INTEGRAL we have performed a search for a prompt gamma-ray counterpart of the cosmic neutrino candidate IceCube-171106A (GCN 22105). At the time of the event (2017-11-06 18:39:39 UTC, hereafter T0), INTEGRAL was operating in nominal mode. The peak of the neutrino localization probability was at an angle of 44 deg with respect to the spacecraft pointing axis. This orientation implies strongly suppressed response of ISGRI and IBIS/Veto, and somewhat suppressed response of SPI-ACS. The background within +/-300 seconds around the event was very stable.  We do not detect any significant counterparts and estimate a 3-sigma upper limit on the 75-2000 keV fluence of 2.7e-07 erg/cm^2 for a burst lasting less than 1 s with a characteristic short GRB spectrum (an exponentially cut off power law with alpha=-0.5 and Ep=600 keV) occurring at any time in the interval within 300 s around T0. For a typical long GRB spectrum (Band function with alpha=-1, beta=-2.5, and Ep=300 keV), the derived peak flux upper limit is ~3e-07 (8.6e-07) erg/cm^2/s at 1 s (8 s) time scale in 75-2000 keV energy range. //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 22114 SUBJECT: HAWC follow-up of IceCube-171106A DATE: 17/11/09 22:42:33 GMT FROM: Simone Dichiara at UNAM Simone Dichiara (UNAM-IA), Israel Martinez (University of Maryland), J.A. García-González (UNAM-IF), Ignacio Taboada (Georgia Tech) report on behalf of the HAWC collaboration (https://www.hawc-observatory.org/collaboration/): On 2017/11/06 18:39:39.21 UT IceCube detected a track-like, very-high-energy event with a high probability of being of astrophysical origin, at RA=340.00d and Dec=+7.40d J2000 as reported in GCN circular 22105. The event was not in the field of view of HAWC, so we analyze the data following two different approaches: *We searched for a steady source in archival data from November 2014 to September 2017. Assuming a spectral index of -2.5 we searched in the reported 90% PSF containment circle.The maximum significance is 1.57 sigma at RA=339.48deg and Dec=7.78deg. We estimate the number of trials to be ~20. We set an upper limit 95% CL on gamma rays for this period of: E^2 dN/dE = 4.60e-13 (E/TeV)^-0.5 TeV cm^-2 s^-1. *We also performed a study using data corresponding to the two nearest transits of IceCube-171106 in HAWC’s field of view (MJD 58062.96-58063.22 and 58063.95-58064.21). Using the same spectral index and search window, the maximum significance is 1.2 sigma at RA=340.35deg and Dec=7.12deg. We set an upper limit 95% CL on gamma rays for this period of: E^2 dN/dE = 9.38e-12 (E/TeV)^-0.5 TeV cm^-2 s^-1. HAWC is a very-high-energy gamma-ray observatory located in Central Mexico at latitude 19 deg North. It operates 24 hours per day with over 95% duty cycle. HAWC has an instantaneous field of view of 2 sr and surveys 2/3 of the sky every day. It is sensitive to gamma rays from 300 GeV to 100 TeV. //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 22115 SUBJECT: IceCube-171106A: Swift Observations DATE: 17/11/10 00:24:52 GMT FROM: Azadeh Keivani at PSU A. Keivani (PSU), D.B. Fox (PSU), J.J. DeLaunay (PSU), J.A. Kennea (PSU), P.A. Evans (U. Leicester), D.F. Cowen (PSU), J.P. Osborne (U. Leicester), and F.E. Marshall (GSFC) report on behalf of the Swift-IceCube collaboration: Swift has observed the field of the IceCube EHE event, IceCube-171106A (Revision 0, https://gcn.gsfc.nasa.gov/notices_amon/17569642_130214.amon; subsequently updated to Revision 1, GCN #22105), utilizing the on-board 19-point tiling pattern to cover a region centered on RA,Dec (J2000) = (340.0d, +7.4d), with a radius of approximately 0.8 degrees. Swift-XRT collected ~750 s per field of PC mode data per tile. The observations were taken between 21:51:12 UT on 2017 November 06 and 11:52:10 UT on 2017 November 07 (i.e. from 11.5 ks to 62.0 ks after the neutrino trigger), and covered 2.1 square degrees. Fourteen X-ray sources are detected in the observations, of which five lie within the refined neutrino localization. Of the fourteen identified sources, two correspond to known X-ray emitters, X1 to 1RXS J224124.3+071253, and X3 to UGC 12138. Two further sources, X4 and X14, have positions consistent with ROSAT Faint Source Catalog objects. Five further sources have potential counterparts from the SIMBAD database. X2 matches to HD 215109; detection of this optically bright star may be due to optical loading rather than bona fide X-ray emission. X5 matches to 87GB 223537.9+070825 (5BZQJ2238+0724 in BZcat), which is a flat-spectrum radio quasar and known blazar, not previously reported to emit in X-rays. X6 matches to PMN J2243+0716, a radio-bright quasar. X8 matches to the GALEX “blue object” source 2690384041306227301. X10 matches to WISE J224206.68+073148.3, a known BL Lac-type blazar. Observing X-ray emission (or in the case of HD 215109, an optical loading detection) at the level seen here from any of these sources would not be remarkable. Given the recent observation of high-energy gamma-ray activity from TXS 0506+056, potentially associated with the high-energy neutrino IceCube-170922A (GCN #21916, ATel #10791, ATel #10817), we note in particular the two X-ray luminous blazars within the neutrino localization, 87GB 223537.9+070825 and WISE J224206.68+073148.3. Identified sources: Source RA Dec r_90 R_x** Catalog/Notes ================================================================= X1* 22:41:24.15 +07:12:57.6 4.1” 61(9) 1RXS J224124.3+071253 X2 22:42:48.20 +06:40:14.2 4.4” 82(3) HD 215109 (optical loading) X3 22:40:17.14 +08:03:13.4 2.1” 410(3) UGC 12138 X4 22:41:20.34 +06:48:58.7 5.4” 32(9) 1RXS J224122.2+064851 (?) X5* 22:38:10.41 +07:24:12.8 5.2” 30(8) 87GB 223537.9+070825 X6 22:43:05.82 +07:16:34.7 5.7” 9(5) PMN J2243+0716 X7 22:37:54.30 +07:22:02.9 6.8” ? X8 22:38:59.95 +07:02:43.7 6.3” 4(4) GALEX 2690384041306227301 X9* 22:38:47.59 +07:22:24.8 6.1” ? X10* 22:42:06.68 +07:31:52.6 7.4” 7(4) WISE J224206.68+073148.3 X11 22:40:15.96 +07:48:42.2 5.9” 9(4) X12 22:40:26.17 +06:50:14.3 5.9” 4(4) X13 22:38:21.18 +08:04:20.7 4.9” 3(5) X14* 22:39:52.53 +07:11:57.1 6.7” 9(5) 1RXS J223951.8+071132 (?) ================================================================= * inside the refined 90%-confidence neutrino localization ** R_x indicate count rate in units of counts ks^-1. Of the identified sources, the following lie outside the refined 90%-confidence neutrino localization reported by IceCube (GCN #22105): X2, X3, X4, X6, X7, X8, X11, X12, X13. The remaining sources (indicated with asterisks by their source names) lie within the neutrino localization. Excluding identified sources, 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=3e20 cm^-2, Gamma=1.7). Overlaps between the different tiles account for 0.5 square degrees: in these regions the 3-sigma upper limit is 0.009 ct s^-1, corresponding to 3.7e-13 erg cm^-2 s^-1. The neutrino localization was in the Swift's Burst Alert Telescope's (BAT) field of view from 404 seconds to 117 seconds prior to the EHE alert time. There were no triggered GRBs during this time. Using the 287 second BAT survey exposure (starting at 18:32:55 UT on 2017 November 06) we searched for any hard X-ray emission inside the 90%-confidence neutrino localization. We found no point source and set a 4-sigma upper limit on the fluence during that time period of 5e-7 erg cm^-2 (15-150 keV) assuming a photon index of -2. //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 22132 SUBJECT: Fermi-LAT Gamma-ray Observations of IceCube-171106A DATE: 17/11/18 01:29:26 GMT FROM: Sara Buson at GSFC/Fermi S. Buson (NASA/GSFC), M. Kreter (Wurzburg Univ.), D. Kocevski (NASA/MSFC) report on behalf of the Fermi-LAT collaboration We report follow-up observations of the [very] high-energy IceCube-171106A neutrino event (GCN #22105) with all-sky survey data from the Large Area Telescope (LAT), on board the Fermi Gamma-ray Space Telescope. The IceCube event was detected on 2017-1-06 18:39:39.21 UTC (T0) with J2000 position RA =340.25 deg, Dec = 7.314 deg (14.99 arcmin 50% containment). The closest cataloged >100 MeV gamma-ray source is 3FGL J2234.8+0945, at a distance of roughly 2.9 deg. The source is associated with the pulsar PSR J2234+0944. We searched for the existence of intermediate (days to months) timescale emission from a new gamma-ray transient source [or excess emission from a known catalog source]. Preliminary analysis indicates no significant excess gamma-ray emission (0.1 - 300 GeV) within the IceCube-171106A 50% confidence localisation. Assuming a power-law spectrum (photon index = 2.2 fixed) for a point source at the IceCube position, the >100 MeV photon flux upper limits (95% confidence) are < 2.0 x 10^-7 ph cm^-2 s^-1 in one day of exposure prior to T0, and < 3.4 x 10^-8 ph cm^-2 s^-1 in one week of exposure prior to T0, and < 1.8 x 10^-9 ph cm^-2 s^-1 in eight months of exposure prior to T0. Swift-XRT follow up observations of the IceCube-171106A field by Keivani et al (GCN #22115) reported the detection of several X-ray sources. Integrating the LAT data for the time intervals aforementioned, no significant gamma-ray emission is observed consistent with these sources. Because Fermi operates in an all-sky scanning mode, regular gamma-ray monitoring of this source region will continue. For this source the Fermi LAT contact person is S. Buson (email: sara.buson at nasa.gov). The Fermi LAT is a pair conversion telescope designed to cover the energy band from 20 MeV to greater than 300 GeV. It is the product of an international collaboration between NASA and DOE in the U.S. and many scientific institutions across France, Italy, Japan and Sweden. //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 22167 SUBJECT: INTEGRAL pointed follow-up of IceCube-171106A DATE: 17/11/24 21:08:15 GMT FROM: Marcos Santander at U of Alabama On 2017-11-06 18:39:39 UTC the IceCube detector observed an energetic neutrino event with a high probability of being astrophysical in origin (GCN 22105). The best-fit position of the neutrino provided by IceCube is RA2000 = 340.0 (-0.5/+0.5) deg and Dec2000 = 7.4 (-0.25/+0.35) deg, with uncertainties quoted at the 90% confidence level. Pointed Target-of-Opportunity observations of the neutrino location with INTEGRAL were obtained between 2017-11-16 19:07 UTC and 2017-11-17 08:28 UTC for a total observation time of 45 ks. A preliminary analysis of the data did not reveal any new sources in the combined ISGRI or JEM-X mosaics. The typical 3-sigma sensitivity reached for the position of IceCube-171106A was 1.9 mCrab (2.9e-11 erg/cm2/s) in JEM-X 3-10 keV mosaic and 3.5 mCrab (2.7e-11 erg/cm2/s) in 20-40 keV ISGRI mosaic. INTEGRAL observations of the neutrino position at the time of the trigger were reported in GCN 22109. We thank the INTEGRAL Science Operations Centre (ESA/ESAC, Madrid, Spain) and the Mission Operations Centre (ESA/ESOC, Darmstadt, Germany) for their prompt scheduling of these observations. M. Santander (University of Alabama, US) V. Savchenko (ISDC, University of Geneva, CH) A. Keivani (Dept. of Physics, Penn State University, US) E. Gotthelf (Columbia University, US) C. Ferrigno (ISDC, University of Geneva, CH), P. Ubertini, A. Bazzano, L. Natalucci (INAF IAPS-Roma, Italy), S. Mereghetti (INAF IASF-Milano, Italy), P. Laurent (CEA, Saclay, France), E. Kuulkers (ESTEC/ESA, The Netherlands) //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 22173 SUBJECT: Pan-STARRS follow-up of IceCube-171106A DATE: 17/11/28 12:57:11 GMT FROM: O. McBrien at QUB O. McBrien, K. W. Smith, S.J. Smartt, D. R. Young (Queen's University Belfast), M. Huber, K. C. Chambers, H. Flewelling, M. Willman, A. Schultz, E. Magnier, C. Waters, J. Bulger, R. J. Wainscoat (IfA, Hawaii), D. Wright, (Univ. of Minnesota), Further to the detection of the Extremely High Energy neutrino event IceCube-171106A (see GCN #22105), we report Pan-STARRS1 imaging of the field and the search for optical transients. We observed the field of the neutrino event at RA=340.0 degrees and DEC=+7.4 degrees (J2000) from MJD 58065.34 (2017-11-08 08:09:36.0 UTC), 37.44 hrs following the IceCube detection with the Pan-STARRS1 telescope in both the i-band and z-band filters (Chambers et al. arXiv:1612.05560). Difference imaging with respect to the Pan-STARRS1 3Pi stacked reference sky reached 5-sigma limiting magnitudes of around i~22.5. Observations were repeated on 10 subsequent nights. Similar to Lipunov et al. (GCN 22104), we find no bright transient source (i,z < 20) in the field. We found 7 fainter transients, which are not known AGN or variable stars, within 1.3 degrees of the estimated position of the neutrino (RA: 340.00, Dec: +7.40). These are all detected over multiple nights. None of them appear to be rising or have a lightcurve that points at a possible temporal coincidence with IceCube-171106A, though two are contained within a 0.7 degree (42 arcmin) radius of the neutrino detection. Three are supernova like candidates, and four are coincident with galaxy cores. These nuclear transients are probably real, but difficult to distinguish between low level nuclear variability and a true transient source. We report the discovery magnitudes, dates and sky locations of the transients for the transients in the 0.7 degree (42 arcmin) radius and those outside it separately as follows. Within 0.7 degree of IceCube-171106A PS Name | RA (J2000) | Dec (J2000) | Ang. Separation (arcmin) | Disc. Date | Disc. Mag. | Notes PS17fcc | 22 41 58.64 | +07 46 53.8 | 37.3 | 20171108 | 21.54 i | (1) PS17eym | 22 39 22.13 | +07 16 36.4 | 11.9 | 20171108 | 21.48 i | (2) Outside 0.7 degree of IceCube-171106A, but within PS1 footprint PS Name | RA (J2000) | Dec (J2000) | Ang. Separation (arcmin) | Disc. Date | Disc. Mag. | Notes PS17fcd | 22 44 01.84 | +08 13 27.6 | 77.7 | 20171109 | 21.53 z | (3) PS17eyn | 22 42 24.63 | +06 55 02.7 | 46.1 | 20171108 | 21.64 I | (4) PS17fem | 22 42 19.31 | +06 42 38.0 | 53.9 | 20171110 | 21.95 I | (5) PS17eyo | 22 40 40.92 | +06 26 29.6 | 58.4 | 20171108 | 22.16 I | (6) PS17eyl | 22 39 02.90 | +06 25 26.3 | 60.2 | 20171108 | 21.23 i | (7) (1) Nuclear transient candidate located 0.59 arcsec N, 0.28 arcsec W of host galaxy (SDSS J224158.66+074653.2). Transient is within 42 arcmin of neutrino detection. (2) SN-like candidate associated with galaxy SDSS J223922.20+071638.0, located 1.80 arcsec S, 0.97 arcsec W from galactic centre, with a host photometric redshift 0.38 +/- 0.11. Transient is within 42 arcmin of neutrino detection. (3) Nuclear transient candidate located 0.37 arcsec N, 0.13 arcsec W of host galaxy (SDSS J224401.85+081327.5). Difference imaging shows positive and negative net flux, implying some galactic core activity. (4) Nuclear transient candidate located 0.58 arcsec N, 0.84 arcsec E of host galaxy (SDSS J224224.58+065502.1). (5) Nuclear transient candidate located 0.57 arcsec N, 0.41 arcsec E of host galaxy (SDSS J224219.29+064237.5). (6) SN-like candidate not matched with catalogued galaxy. (7) SN-like candidate associated with galaxy SDSS J223902.90+062526.6, located 0.28 arcsec S, 0.04 arcsec E from galactic centre, with a host photometric redshift 0.24 +/- 0.10. //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 22283 SUBJECT: IceCube-171106A: Konus-Wind upper limits DATE: 17/12/25 10:45:15 GMT FROM: Anna Kozlova at Ioffe Institute A. Kozlova, S. Golenetskii, R.Aptekar, D. Frederiks, P. Oleynik, M. Ulanov, D. Svinkin, A. Tsvetkova, A. Lysenko, and T. Cline, on behalf of the Konus-Wind team, report: Using Konus-Wind (KW) data, we have performed a search for a gamma-ray transient around the time of the cosmic neutrino candidate IceCube-171106A (2017-11-06 18:39:39.21 UT, hereafter T0; Taboada, GCN 22105; https://gcn.gsfc.nasa.gov/notices_amon/17569642_130214.amon) No triggered KW event happened from ~6.7 hours before and up to ~1.8 days after T0. The closest waiting-mode event was ~7.7 hours before T0. Using waiting-mode data within the interval T0 +/- 1000 s, we found no significant (> 5 sigma) excess over the background in both KW detectors on temporal scales from 2.944 s to 100 s in the 80-1000 keV band. Significant variations in the 20-80 keV band is due to activity of Swift J0243+61. We estimate an upper limit (90% conf.) on the 10 keV – 10 MeV fluence to 9.0x10^-7 erg/cm^2 for a burst lasting less than 2.944 s and having a typical KW short GRB spectrum (an exponentially cut off power law with alpha =-0.5 and Ep=500 keV). For a typical long GRB spectrum (the Band function with alpha=-1, beta=-2.5, and Ep=300 keV), the corresponding limiting peak flux is 3.1x10^-7 erg/cm^2/s (10 keV - 10 MeV, 2.944 s scale). All the quoted values are preliminary. //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 22945 SUBJECT: IceCube-171106A: MASTER optical observation DATE: 18/07/14 12:49:20 GMT FROM: Vladimir Lipunov at Moscow State U/Krylov Obs V. Lipunov, E. Gorbovskoy, V.Kornilov, N.Tiurina, A.Kuznetsov, V.Chazov, I. Gorbunov, D. Vlasenko, D.Zimnukhov, D.Kuvshinov, P.Balanutsa, V.Vladimirov Lomonosov Moscow State University,SAI D. Buckley, South African Astronomical Observatory (SAAO) R. Rebolo, M. Serra, N. Lodieu, G. Israelian, L. Suarez-Andres The Instituto de Astrofisica de Canarias (IAC) A. Tlatov, V.Senik, D. Dormidontov Kislovodsk Solar Station of the Pulkovo Observatory R. Podesta, F. Podesta, C. Lopez, C.Francile Observatorio Astronomico Felix Aguilar (OAFA) H.Levato, Instituto de Ciencias Astronomicas, de la Tierra y del Espacio (ICATE) O. Gres, N.M.Budnev, Yu.Ishmuhametova Irkutsk State University (ISU) A. Gabovich, V. Yurkov, Yu. Sergienko Blagoveschensk Educational State University (BSPU) MASTER Global Robotic Net observed the field of the IceCube EHE event IceCube-171106A Taboada et al. GCN 22105 (also observed by Swift, see Keivani et al. ATEL #10942) The IC171106A altitude at alert time (Date: 17/11/06 18:39:39.21 UT J2000 RA:340.00 (-0.50/+0.70 deg 90% PSF containment) Dec: +7.40 (-0.25/+0.35 deg 90% PSF containment)) MASTER-IAC (Tenerife) Object: Altitude: 54.48 Azimuth: 300.17 Sun: Altitude: -5.64 Azimuth: 74.70 Moon: Altitude: -22.37 Azimuth: 232.01 MASTER-SAAO (South Africa) Object: Altitude: 49.68 Azimuth: 169.40 Sun: Altitude: -18.49 Azimuth: 56.02 Moon: Altitude: -11.82 Azimuth: 255.21 MASTER-Kislovodsk (Russia) Object: Altitude: 45.89 Azimuth: 43.01 Sun: Altitude: -50.59 Azimuth: 123.99 Moon: Altitude: 26.64 Azimuth: 269.05 MASTER-Tavrida Object: Altitude: 48.79 Azimuth: 31.15 Sun: Altitude: -44.81 Azimuth: 115.65 Moon: Altitude: 20.62 Azimuth: 263.71 MASTER-Kislovodsk pointed to the IC 171106A at 2017-11-06 18:40:45UT, 66s after trigger time . There were 4 alert images: Date,UT Exp mlim MASTERtube 2017-11-06 18:50:16 180 19.3 EAST 2017-11-06 18:47:06 180 19.3 EAST 2017-11-06 18:43:56 180 19.1 EAST 2017-11-06 18:40:45 180 18.9 EAST then MASTER-Kislovodsk returned to Fermi trigger 531665037 inspection https://gcn.gsfc.nasa.gov/other/531665037.fermi (GRB_TIME: 17/11/06 12:43:52.33UT 02h 00m 50s +59d 29' 24") MASTER-SAAO was pointed to IC 171106A at 2017-11-06 18:40:50UT 71s after trigger time Unfiltered limits of alert images are the following: Date,UT Exp mlim MASTER_tube 2017-11-06 18:40:50 540 20.3 EAST 2017-11-06 18:40:50 180 19.9 EAST 2017-11-06 18:40:50 540 20.6 WEST 2017-11-06 18:40:50 180 20.2 WEST 2017-11-06 18:44:07 180 20.0 EAST 2017-11-06 18:44:07 180 20.2 WEST 2017-11-06 18:47:22 180 20.0 EAST 2017-11-06 18:50:38 180 20.0 EAST 2017-11-06 18:50:38 180 20.1 WEST 2017-11-29 18:44:51 180 19.4 EAST 2017-11-29 18:44:51 540 19.6 EAST 2017-11-29 18:44:51 180 19.1 WEST 2017-11-29 18:44:51 540 19.9 WEST 2017-11-29 18:49:52 180 19.0 EAST 2017-11-29 18:49:52 180 19.4 WEST 2017-11-29 18:53:56 180 18.9 EAST 2017-11-29 18:53:56 180 19.1 WEST 2017-11-29 19:11:09 540 19.8 EAST 2017-11-29 19:11:09 180 19.0 EAST 2017-11-29 19:11:09 180 19.4 WEST 2017-11-29 19:11:09 540 20.0 WEST 2017-11-29 19:17:27 180 19.1 EAST 2017-11-29 19:17:27 180 19.3 WEST 2017-11-29 19:24:21 180 19.1 EAST 2017-11-29 19:24:21 180 19.3 WEST 2017-11-29 19:30:27 180 19.0 EAST 2017-11-29 19:30:27 180 19.3 WEST MASTER-IAC pointed to the IC 171106A at 2017-11-06 18:41:11UT 91.8s after trigger time. The Sun_Altitude was -5.64, and so as MASTER-Kislovodsk and MASTER-SAAO followed up alert observations, MASTER-IAC followed Fermi inspection after sunset, and followed IceCube inspection on next day by usual inspect program 2017-11-07 19:33:49 540 20.0 EAST 2017-11-07 19:33:49 180 19.3 EAST 2017-11-07 19:37:42 540 20.0 WEST 2017-11-07 19:37:42 180 19.6 WEST 2017-11-07 19:37:36 180 19.4 EAST 2017-11-07 19:41:35 180 19.6 WEST 2017-11-07 19:41:35 180 19.4 EAST 2017-11-07 19:45:36 180 17.8 WEST 2017-11-07 19:49:45 180 18.7 EAST 2017-11-07 19:53:17 180 18.9 EAST 2017-11-07 19:53:17 180 18.0 WEST MASTER-Tavrida started inspect IC171106A in a weak as usual inspect program on 2017-11-13 19:03:59 UT with the following unfiltered limits Date,UT Exp mlim MASTER_tube 2017-11-13 19:55:03 180 18.4 EAST 2017-11-13 19:55:03 180 17.8 WEST 2017-11-13 19:51:01 180 18.8 WEST 2017-11-13 19:47:28 180 18.8 WEST 2017-11-13 19:32:55 180 18.8 WEST 2017-11-13 19:29:21 180 18.8 WEST 2017-11-13 19:25:45 540 19.5 WEST 2017-11-13 19:25:45 180 18.8 WEST 2017-11-13 19:07:32 180 18.0 WEST 2017-11-13 19:03:59 180 18.0 WEST There is one BL Lac type object with Radio and Gamma inside IceCube error box (see Gamma-ray blazar candidates (Sowards-Emmerd+, 2005) J223810.3+072413 . There are large number AGN and QSO candidates. This message may be cited.