//////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 19743 SUBJECT: HAWC follow up of IceCube 160731 DATE: 16/07/31 14:24:27 GMT FROM: Ignacio Taboada at Georgia Inst of Tech I. Taboada (Georgia Tech) reports on behalf of the HAWC collaboration (http://www.hawc-observatory.org/collaboration/): On July 31, 2016, 1:55:04 UTC, the IceCube collaboration reported a track-like very-high-energy event that has a high probability of being an astrophysical neutrino, IceCube-160731, at RA 215.1090 and Dec -0.4581 (J2000). In HAWC’s sky, the neutrino was at zenith 31.55 deg and setting. We have searched to a steady source as well as a transient source. * Search for a steady source in archival data from November 2014 to February 2016. Assuming a spectral index of -2.7 we searched in a 1.5 degree circle around IceCube’s reported location. The highest significance, 3.57 sigma, was at RA= 216.43 deg, Dec= 0.15 deg (J2000). Note that there are at least 100 trials in this search, so post-trials significance is lower. We set a time-integrated limit 95% CL upper limit on gamma rays of: E^2 dN/dE = 2.56e-12 (E/TeV)^-0.7 TeV.cm^-2.s^-1 * We have also searched for transient sources. We have studied the transit of the location (start 2016/07/30 21:28:57 UTC / stop 2016/07/31 02:59:15 UTC). The most significant location, within 1.5 degrees is 1.12 sigma (RA = 214.67 deg, Dec= 1.04 deg, J2000). HAWC is a very-high-energy gamma-ray observatory operating in Central Mexico at latitude 19 deg. north. Operating day and night 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: 19747 SUBJECT: Swift follow up of IceCube-160731A DATE: 16/08/01 15:00:23 GMT FROM: Phil Evans at U of Leicester P.A. Evans (U. Leicester), J.A. Kennea (PSU), A. Keivani (PSU), D.B. Fox (PSU), G. Tesic (PSU), D.F. Cowen (PSU), J.P. Osborne (U. Leicester), M.W.E. Smith (JPL) and F.E. Marshall (GSFC) report on behalf of the Swift-IceCube collaboration: Swift has observed the field of the IceCube HESE event IceCube-160731A, "AMON ICECUBE HESE 128290 6888376" (revision 0), utilising the on-board 19-point tiling pattern to cover a region centred on RA,Dec (J2000) = (215.109, -0.458), 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 03:00:46 and 14:51:52 on 2016 Jul 31 (i.e. from 3.9 ks to 46.5 ks after the neutrino trigger), and covered 2.1 square degrees. Six X-ray sources are detected in the observations. All of these correspond either to known X-ray emitters, or to objects catalogued (e.g. in SIMBAD) and from which X-rays may be expected. Therefore, 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 4.3e-13 erg cm^-2 s^-1 for a typical AGN spectrum (NH=3e20 cm^-2, Gamma=1.7). Overlaps between the different tiles accounts for 0.5 square degrees: in these regions the 3-sigma upper limit is 0.0071 ct s^-1, corresponding to 3.1e-13 erg cm^-2 s^-1. No transient sources were detected in the UVOT data, down to a 3-sigma upper limit of 18.0, in the u filter. Details of the six detected X-ray sources are below. All fluxes are 0.3-10 keV and assume the same AGN spectrum as above. Source 1 ======== RA: 14h 22m 46.57s = 215.69403d Dec: -00d 38' 16.0" = -0.63777d Error: 4.2 arcsec (90% confidence radius) Count rate: (1.7 +/- 0.4) x 10^-2 ct s^-1 Flux: (7.3 +/- 1.7) x 10^-13 erg cm^-2 s^-1 Notes: This source is 2.4" from HD 125981 which SIMBAD lists as an A0IV star (classified by the Michigan Spectral Survey). This detection may not be due to an X-ray source, but due to the bright (V = 6.7) stellar optical flux. Source 2 ======== RA: 14h 19m 36.50s = 214.90209d Dec: -01d 08' 45.3" = -0.14592d Error: 4.9 arcsec (90% confidence radius) Count rate: (1.3 +/- 0.6) x 10^-2 ct s^-1 Flux: (5.6 +/- 2.6) x 10^-13 erg cm^-2 s^-1 Notes: This source is 6.5" from [VV2006] J141936.0-010840 which SIMBAD lists as a quasar. Source 3 ======== RA: 14h 22m 53.44s = 215.72267d Dec: -00d 01' 50.7" = -0.03074d Error: 5.9 arcsec (90% confidence radius) Count rate: (2.2 +/- 0.7) x 10^-2 ct s^-1 Flux: (9.5 +/- 3.0) x 10^-13 erg cm^-2 s^-1 Notes: This source is 2.2" from QSO J1422-0001 which SIMBAD lists as a quasar, and 3.1" from the known X-ray source, 3XMM J142253.3-000149. The observed X-ray flux is consistent with the flux in the 3XMM catalogue. Source 4 ======== RA: 14h 22m 53.44s = 215.72267d Dec: -00d 36' 00.1" = -0.60004d Error: 8.1 arcsec (90% confidence radius) Count rate: (6.7 +/- 3.2) x 10^-3 ct s^-1 Flux: (2.9 +/- 1.4) x 10^-13 erg cm^-2 s^-1 Notes: This source has been previously detected by Swift (1SXPS J142252.8-003553) and the observed flux is consistent with the catalogued values. Source 5 ======== RA: 14h 19m 50.15s = 214.95898 Dec: -00d 06' 45.6" = -0.11266d Error: 5.5 arcsec (90% confidence radius) Count rate: (1.5 +/- 0.6) x 10^-2 ct s^-1 Flux: (6.5 +/- 2.6) x 10^-13 erg cm^-2 s^-1 Notes: This source is 2.3" from [VV2006] J141949.9-000644 which SIMBAD lists as a quasar. Source 6 ======== RA: 14h 19m 50.15s = 214.61169d Dec: -00d 06' 45.6" = 0.24144d Error: 6.6 arcsec (90% confidence radius) Count rate: (1.5 +/- 0.7) x 10^-2 ct s^-1 Flux: (6.5 +/- 3.0) x 10^-13 erg cm^-2 s^-1 Notes: This source is 2.3" from 2MASS J14182661+0014283, which appears to be a late-type star. //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 19748 SUBJECT: Global MASTER net follow up of IceCube-160731A DATE: 16/08/01 16:44:51 GMT FROM: Vladimir Lipunov at Moscow State U/Krylov Obs V. Lipunov, E.S. Gorbovskoy, N.Tyurina, V.Kornilov, P.Balanutsa, A.Kuznetsov, D.Kuvshinov, I.Gorbunov Lomonosov Moscow State University, Sternberg Astronomical Institute A. Tlatov, V.Senik, A.V. Parhomenko, D. Dormidontov Kislovodsk Solar Station of the Pulkovo Observatory D.Buckley, S. Potter, A.Kniazev, M.Kotze South African Astronomical Observatory R.Rebolo, M.Serra, N.Lodieu, G.Israelian The Instituto de Astrofisica de Canarias R.Podesta, C.Lopez and F.Podest Observatorio Astronomico Felix Aguilar (OAFA), San Juan National University H.Levato and C.Saffe Instituto de Ciencias Astronomicas, de la Tierra y del Espacio (ICATE) O.Gres, K.Ivanov, S.Yazev, N.M.Budnev, O.Chuvalaev, V.A.Poleshchuk Irkutsk State University V.Yurkov, Yu.Sergienko, A.Gabovich, E.Sinyakov Blagoveschensk Educational State University, Blagoveschensk MASTER Global robotic Net (MASTER-Net: http://observ.pereplet.ru) received IceCube HESE event IceCube-160731A (AMON ICECUBE HESE 128290 6888376) at 2016-07-31 01:55:34.5 UT (30s after the EHE_event_time). At the alert time there was a day at MASTER-Amur, -Tunka, -Kislovodsk. It was under the horizont at At MASTER-SAAO ( -42.52deg ) and MASTER-IAC ( -14.50). MASTER-OAFA (Argentina) did not received alert due to problems with internet. So we started observations at the following night. MASTER-Kislovodsk robotic telescope (Kislovodsk, Russia) was pointed to the IceCube neutrino 160731 event (Taboada et al GCN 19743) 61241 sec after trigger time at 2016-07-31 19:23:17 UT. The 5-sigma upper limit has been about 19.0 on single (180 sec) and 19.8 on coadd (1260 sec ) unfiletered images. MASTER-IAC robotic telescope (Teide observatory, Canary Islands/Spain) was pointed to the IceCube neutrino 160731 event 68442 sec after trigger time at 2016-07-31 21:25:16 UT. The 5-sigma upper limit has been about 20.0 on single (180 sec) and 20.7 on coadd (2160 sec ) unfiletered images. MASTER-OAFA robotic telescope (Felix Aguilar observatory, Argentina) was pointed to the IceCube neutrino 160731 event 75655 sec after trigger time at 2016-07-31 22:55:29 UT. The 5-sigma upper limit has been about 19.8 on single (180 sec) and 20.5 on coadd (3600 sec ) unfiletered images. No astrophysical OT detected inseide 2 square degrees around center AMON ICECUBE HESE 128290 6888376 error-box. However we detected and found: 1. MASTER OT J142038.73-002500.1 - the one point-like partical CCD event from AMON ICECUBE HESE 128290 6888376 event error box. Date Time Expt. Ra Dec Mag |---------------------|-------|-----------------|-----------------|------- 2016-07-31 19:26:57 180 (14h 20m 38.73s -00d 25m 00.1s) 17.9 2. The very bright NGC5584 galaxy (12.8 mag) presented at Ice Cube error box. Totaly there is 19 Galaxy up to 17 mag at Ice Cube error box. The brightest galaxy at error box highlighted at out most deep image: IAC images (lim = 20.7) is available at http://master.sai.msu.ru/static/IceCube160731.png OAFA image (lim= 20.4) is available at http://master.sai.msu.ru/static/IceCube160731a.png 3. We checked Swift X-ray sources (Evans et al., GCN 19747) inside this IceCube error-box. The Source1 (215.69403d, -0.63777d) is a bright known star HD 125981 (A3IV, Skiff, Catalogue of Stellar Spectral Classifications), MASTER doesnt' see variability. The Source2 (214.90209d, -0.14592d) : there is no OT in MASTER-Net database up to 20.7 unfiltered optical limit. There is infrared source (AllWise, etc) in 2.2". The Source3 (215.72267, -0.03074): there is a source with m_OT=19.0 without changhing with respect to MASTER-Net database. There is a USNO-B1 star with B2=19.49, R2=18.93.This star is a GALEX source (possible accretion to the white dwarf companion). The Source4 (215.72267, -0.60004): there is no source in MASTER images (20.7 unfiltered optical limit in 68442sec after trigger) and in VIZIER database (22m optical limit from POSS images). The Source 5(214.95898, -0.11266) . There is a Sloan QSO in 4.1" , no change with respect to MASTER database. The Source 6 (214.61169, 0.24144). Known bright star (USNO-B1 B2=15.30, R2=13.77,I=12.36), also a Galex source, i.e. possible accretting white dwarf) without variability on MASTER database. Results: Source 1, 3, 6 not coonected with IceCube event. Swift XRT sources 2,4,5 are interested. The message may be cited. //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 19752 SUBJECT: FACT follow-up of IceCube20160731 DATE: 16/08/01 21:38:13 GMT FROM: Daniela Dorner at U of Wuerzburg A. Biland (ETH Zurich) reports on behalf of the FACT collaboration: On July 31, 2016, 1:55:04 UTC, the IceCube collaboration reported the detection of a high-energy neutrino (run number 128290, event number 6888376). The alert was followed up by HAWC (GCN #19743), Swift (GCN #19747) and MASTER (GCN #19748). FACT observed the updated position on 2016-07-31 from 21:42 UTC to 22:25 UTC with a total on-time of 40 minutes. Apart from a bit of calima, the weather conditions were good. The source was observed at a zenith distance from 50 degree to 58 degree. The automatic Quick Look Analysis (http://www.fact-project.org/monitoring) does not show any signal from the position http://fact-project.org/monitoring/index.php?y=2016&m=07&d=31&source=21&timebin=3&plot=night The First G-APD Cherenkov Telescope (FACT) is an imaging air Cherenkov telescope monitoring at TeV energies. It is located in the Observatorio del Roque de los Muchachos on the Canary Island La Palma. //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 19758 SUBJECT: GBM Observations of IceCube 160731 DATE: 16/08/02 22:51:16 GMT FROM: Eric Burns at U of Alabama E. Burns (UAH) and P. Jenke (UAH) report on behalf of the GBM Team: At 01:55:04 UTC on July 31 2016 the IceCube collaboration observed an event that has a high probability of being an astrophysical neutrino at RA 215.1090, Dec -0.4581 (J2000) (AMON ICECUBE HESE 128290 6888376). This position was occulted by the Earth for Fermi at the time the neutrino was detected. GBM therefore cannot set any limits on impulsive emission. Measurements using the Earth Occultation technique around this position place a three sigma flux upper limit of about 230 mCrab between 12 and 100 keV between July 30th and August 1st. //////////////////////////////////////////////////////////////////////// ATEL #9301 ATEL #9301 Title: H.E.S.S. follow-up of IceCube-160731A Author: Mathieu de Naurois for the H. E.S. S. collaboration Queries: contact.hess@hess-experiment.eu Posted: 2 Aug 2016; 15:57 UT Subjects:Gamma Ray, TeV, Neutrinos, Transient The H.E.S.S. instrument was used to carry out follow-up observations of a high energy neutrino detected by IceCube on the 31st July 2016 at 01:55:04 UTC. The IceCube best fit position is Ra = 214.54, Dec = -0.33 with a radius of 0.75 deg at 90% confidence. The event was classified as Extremely-High-Energy (EHE) event suggesting a neutrino energy of more than 1 PeV. H.E.S.S. observed the region in two consecutive nights (2016-07-31/08-01 and 2016-08-01/02) for roughly 1 hour each. The observations were taken with the full array consisting of one 28m diameter telescope and four 12m diameter telescopes. A preliminary on-site calibration and analysis searching for a point-like gamma-ray source from within the 90% uncertainty region of IceCube160731 revealed no significant emission. H.E.S.S. is an array of five imaging atmospheric Cherenkov telescopes for the detection of very-high-energy gamma-ray sources and is located in the Khomas Highlands in Namibia. It was constructed and is operated by researchers from Armenia, Australia, Austria, the Czech Republic, France, Germany, Ireland, Netherlands, Japan, Poland, South Africa, Sweden, UK, and the host country, Namibia. //////////////////////////////////////////////////////////////////////// ATEL #9303 ATEL #9303 Title: Fermi LAT Gamma-ray Observations of IceCube-160731 Author: C. C. Cheung (NRL), M. W. Toomey (Penn State), D. Kocevski (NASA/GSFC), S. Buson (NASA/GSFC), on behalf of the Fermi-LAT collaboration Queries: Teddy.Cheung@nrl.navy.mil Posted: 2 Aug 2016; 22:13 UT Subjects:Gamma Ray, >GeV, Neutrinos We report follow-up of the extremely high-energy (EHE) IceCube-160731 neutrino event (AMON GCN notice; http://gcn.gsfc.nasa.gov/notices_amon/6888376_128290.amon) 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 2016 July 31 at 01:55:04 UTC with J2000 position, RA = 214.54 deg, Decl. = -0.33 deg. Follow up observations from other observatories have been reported (ATEL #9294, #9295, #9298, #9301, GCN #19743, #19752). Preliminary analysis indicates no significant gamma-ray emission. Assuming a single power-law (photon index = 2.2 fixed) for a point source at the IceCube position, the >100 MeV flux upper limits (95% confidence) are <1 x 10^-7 ph cm^-2 s^-1 in 2.25 days of exposure (beginning on 2016 July 31 at 00:00 UTC) and <0.6 x 10^-7 ph cm^-2 s^-1 in 8.25 days of exposure (beginning 2016 July 25 at 00:00 UTC). The latter time interval covers the period observed with AGILE (ATEL #9295). 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 persons are C.C. Cheung (Teddy.Cheung at nrl.navy.mil) and D. Kocevski (e-mail: daniel.kocevski 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: 19760 SUBJECT: IceCube-160731A: iPTF P48 Observations DATE: 16/08/04 00:11:38 GMT FROM: Leo Singer at GSFC/iPTF L. P. Singer (NASA/GSFC), M. M. Kasliwal (Caltech), Varun Bhalerao (IUCAA), Anna Ho (Caltech), Tom Barlow (Caltech), S. B. Cenko (NASA/GSFC), E. O. Ofek (Weizmann), N. Strotjohann (DESY), A. Franckowiak (DESY), M. Kowalski (DESY), and G. Tesic (PSU) report on behalf of the Intermediate Palomar Transient Factory (iPTF) collaboration: Following the detection and updated localization of the cosmic neutrino candidate IceCube-160731A (http://gcn.gsfc.nasa.gov/notices_amon/6888376_128290.amon), we began searching for optical counterparts using the Palomar 48-inch Oschin telescope (P48) on 2016-07-31 at 05:22 UT, 3.5 hours after the trigger. We imaged one field covering an area of 7.1 deg^2 to a limiting magnitude of R=19.1--19.7. Unfortunately, the EHE localization coincides with an inoperable CCD. Sifting through candidate variable sources using image subtraction and standard iPTF vetting procedures, we do not detect any optical transients close to the IceCube error circle. Two optical transient candidates are found at 1.1 and 2.0 deg from the neutrino candidate position: name RA Dec sep mag t ----------------------------------------------- iPTF16elf 213.555124 -0.894361 1.1 17.25 3.5 iPTF16elg 212.640918 -0.988094 2.0 18.71 3.75 The two transients are positionally consistent with the nuclei of their respective host galaxies, CGCG 018-088 at z=0.038 and SDSS J141033.84-005918.0 at z=0.054. Positions are in J2000. Separations are in degrees and relative to the best-estimate IceCube position (214.5440d -0.3347d). Magnitudes are in the Mould R filter and in the AB system, calibrated with respect to point sources in SDSS as described in Ofek et al. (2012, http://dx.doi.org/10.1086/664065). Times are in hours since the IceCube trigger. The diagram http://asd.gsfc.nasa.gov/Leo.Singer/iptf/IceCube-160731.pdf shows the P48 field in relation to the IceCube 1-sigma error circles. //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 19772 SUBJECT: Search for counterpart to IceCube-160731A with ANTARES DATE: 16/08/05 06:20:35 GMT FROM: Damien Dornic at CPPM,France D. Dornic (CPPM/CNRS), A. Coleiro (APC/Universite Paris Diderot), report on behalf of the ANTARES Collaboration: Using data from the ANTARES detector, we have performed a follow-up analysis of the recently reported single extremely high-energy (EHE) neutrino +IceCube-160731A (AMON IceCube HESE 128290 6888376). Its position is -28.1 degrees below the horizon for ANTARES which could yield to an up-going +event at the time of the event. ANTARES is the largest neutrino detector installed in the Mediterranean Sea primarily sensitive to astrophysical neutrinos in the TeV-PeV energy +range. At 10 TeV, the median angular resolution for muon neutrinos is below 0.5 degrees. In the range 1-100 TeV, ANTARES has the best +sensitivity to this position in the sky. No up-going muon neutrino candidate events were recorded within three degrees of the IceCube event coordinates during a +/- 1h time-window +centered on the IceCube event time. A search on an extended time window of +/- 1 day has also yielded no detection (50% visibility probability). This yields a preliminary 90% upper limit on the fluence from a point source of 14 GeV.cm^-2 (2.8 TeV-3.1PeV, energy range corresponding to +5-95% of the energy distribution) and 27 GeV.cm^-2 (0.4-280 TeV) assuming a E^-2 and E^-2.5 power law spectrum, respectively. [GCN OPS NOTE(05aug16): Per operator, the double TITLE-block was removed.] //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 19777 SUBJECT: IceCube-160731A: Konus-Wind limits DATE: 16/08/05 15:52:16 GMT FROM: Dmitry Frederiks at Ioffe Institute D. Frederiks, S. Golenetskii, R.Aptekar, P. Oleynik, M. Ulanov, D. Svinkin, A. Tsvetkova, A.Lysenko, A. Kozlova, 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- 160731A (http://gcn.gsfc.nasa.gov/notices_amon/6888376_128290.amon) No triggered KW event happened from ~5 days before to ~1 day after the IceCube event. The nearest KW triggers are GRB 160726A (Frederiks et al, GCN 19733) and GRB 160802A (Kozlova et al, GCN 19767) Using Konus-Wind waiting mode data in the interval ±1000 s around the IceCube trigger (July 31, 2016, 1:55:04 UTC), we estimate an upper limit (90% conf.) on the 20 – 1200 keV fluence to ~7.7x10^-7 erg/cm^2 for a burst with duration less than 2.944 s and with a typical KW short GRB spectrum (an exponentially cut off power law with alpha^K=-0.5 and Ep=500 keV, Svinkin et al. 2016). For a typical long GRB spectrum (the Band function with alpha=-1, beta=-2.5, and Ep=250 keV), the corresponding limiting peak flux is ~5.8x10^-7 erg/cm^2/s (20 – 1200 keV, 2.944 s scale). A plot of the KW waiting mode data can be found at http://www.ioffe.ru/LEA/IceCube/kw20160731_06904_bg.png All the quoted values are preliminary. //////////////////////////////////////////////////////////////////////// ATEL #9327 ATEL #9327 Title: LCOGT Optical Followup Observations of IceCube-160731 Author: I. Arcavi, G. Hosseinzadeh, D. Guevel, R. Kirptarick, S. Vasylyev, C. McCully, D. A. Howell (LCOGT / UCSB) and S. Valenti (UC Davis) Queries: iarcavi@lcogt.net Posted: 5 Aug 2016; 16:45 UT Subjects:Optical, Neutrinos, Transient We observed the following fields with the Las Cumbres Observatory Global Telescope (LCOGT) Network's 1-meter telescopes in response to the IceCube-160731 event: Center RA Center Dec Date Time Site Instrument 215.096125 -0.4198714 2016-07-31 23:04:41 Chile Sinistro 215.0903862 -0.4211 2016-07-31 23:04:53 Chile SBIG 215.0946317 -0.4198569 2016-08-01 16:56:06 S. Africa SBIG 214.568725 -0.3829144 2016-08-01 18:09:39 S. Africa SBIG 214.5682004 -0.378775 2016-08-02 16:58:26 S. Africa SBIG 214.5645821 -0.3793739 2016-08-02 23:06:07 Chile SBIG 214.5687292 -0.3787639 2016-08-03 16:57:12 S. Africa SBIG 214.5687167 -0.3787667 2016-08-03 18:29:11 S. Africa SBIG 215.59905 -0.3876583 2016-08-01 08:24:06 Australia SBIG 215.59905 -0.3881914 2016-08-01 16:56:06 S. Africa SBIG 215.6009804 -0.3859047 2016-08-01 23:05:20 Chile Sinistro 215.5986554 -0.3878431 2016-08-02 02:47:55 Texas Sinistro 215.5990458 -0.3904944 2016-08-03 17:57:46 S. Africa SBIG 214.5400396 -0.3347533 2016-08-01 00:00:50 Chile Sinistro 214.5439958 -0.3349103 2016-08-01 17:50:07 S. Africa SBIG 214.5393775 -0.3348056 2016-08-02 00:12:25 Chile SBIG 214.5439958 -0.3378797 2016-08-02 16:58:40 S. Africa SBIG 214.5482496 -0.333645 2016-08-02 16:58:53 S. Africa Sinistro 214.5439958 -0.3348056 2016-08-02 23:06:32 Chile Sinistro 214.5487471 -0.3305631 2016-08-03 16:57:22 S. Africa Sinistro The field of view of the SBIG cameras is 15.8' by 15.8', and that of the Sinistro cameras is 26.5' by 26.5'. Our pointings are centered on the centers of the reported IceCube error regions and on two nearby galaxies in those regions: NGC5584 and 2MASX J14181651-0022435. All fields were imaged in U,B,V,g,r,i filters. For the images taken in the g,r,i filters, we subtracted corresponding SDSS images and searched for new sources. Initial inspection of the subtraction images reveals no new sources down to 3-sigma limiting magnitudes >19. Additional observations and analysis are ongoing. ////////////////////////////////////////////////////////////////////////