//////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 24920 SUBJECT: LIGO/Virgo S190630ag: Upper limits from IceCube neutrino searches DATE: 19/06/30 19:26:39 GMT FROM: Raamis Hussain at IceCube IceCube Collaboration (http://icecube.wisc.edu/) reports: Searches [1,2] for track-like muon neutrino events detected by IceCube consistent with the sky localization of gravitational-wave candidate S190630ag in a time range of 1000 seconds [3] centered on the alert event time (2019-06-30 18:43:45.180 UTC to 2019-06-30 19:00:25.180 UTC) have been performed. During this time period IceCube was collecting good quality data. No significant track-like events are found in spatial coincidence of S190630ag calculated from the map circulated in the 1-Preliminary notice. IceCube's sensitivity assuming an E^-2 spectrum (E^2 dN/dE) to neutrino point sources within the locations spanned by the 90% spatial containment of S190630ag ranges from 0.029 to 0.977 GeV cm^-2 in a 1000 second time window. 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 [1] Bartos et al. arXiv:1810.11467 (2018) and Countryman et al.arXiv:1901.05486 (2019) [2] Braun et al., Astroparticle Physics 29, 299 (2008) [3] Baret et al., Astroparticle Physics 35, 1 (2011) //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 24921 SUBJECT: LIGO/Virgo S190630ag Global MASTER-Net observations report DATE: 19/06/30 19:37:18 GMT FROM: Vladimir Lipunov at Moscow State U/Krylov Obs V. Lipunov, E. Gorbovskoy, V.Kornilov, N.Tyurina, P.Balanutsa, A.Kuznetsov, F.Balakin, V.Vladimirov, D. Vlasenko, I.Gorbunov, D.Zimnukhov, V.Senik, T.Pogrosheva, D.Kuvshinov (Lomonosov Moscow State University, SAI, Physics Department), R. Podesta, C.Lopez, F. Podesta, C.Francile (Observatorio Astronomico Felix Aguilar OAFA), H.Levato (Instituto de Ciencias Astronomicas, de la Tierra y del Espacio ICATE), R. Rebolo, M. Serra (The Instituto de Astrofisica de Canarias) D. Buckley (South African Astronomical Observatory), O.A. Gres, N.M. Budnev, O.Ershova (Irkutsk State University, API), A. Tlatov, D. Dormidontov (Kislovodsk Solar Station of the Pulkovo Observatory), V. Yurkov, A. Gabovich, Yu. Sergienko (Blagoveschensk Educational State University) MASTER-Tavrida robotic telescope (Global MASTER-Net: http://observ.pereplet.ru, Lipunov et al., 2010, Advances in Astronomy, vol. 2010, 30L) located in Russia (Lomonosov MSU, SAI Crimea astronomical station) started inspect of the LIGO/Virgo S190630ag errorbox 387 sec after trigger time at 2019-06-30 18:58:32 UT, with upper limit up to 18.6 mag. Observations started at twilight. The observations began at zenit distance = 113 deg. The sun altitude is -12.6 deg. The galactic latitude b = -60 deg., longitude l = 98 deg. Real time updated cover map and OT discovered available here: https://master.sai.msu.ru/site/master2/ligo_1.php?id=10447 We obtain a following upper limits. Tmid-T0 | Date Time | Site | Coord (J2000) |Filt.| Expt. | Limit| Comment _________|_____________________|_____________________|____________________________________|_____|_______|_______|________ 477 | 2019-06-30 18:58:32 | MASTER-Tavrida | ( 18h 46m 19.53s , + 0d 58m 53.19s) | C | 180 | 18.3 | 478 | 2019-06-30 18:58:32 | MASTER-Tavrida | ( 18h 45m 05.49s , + 0d 56m 03.34s) | C | 180 | 18.4 | 717 | 2019-06-30 19:02:32 | MASTER-Tavrida | ( 10h 51m 18.45s , +16d 5m 22.47s) | C | 180 | 17.9 | 938 | 2019-06-30 19:06:12 | MASTER-Tavrida | ( 10h 57m 51.75s , +22d 5m 24.42s) | C | 180 | 18.6 | 938 | 2019-06-30 19:06:12 | MASTER-Tavrida | ( 10h 59m 12.44s , +22d 9m 14.84s) | C | 180 | 17.2 | 1158 | 2019-06-30 19:09:52 | MASTER-Tavrida | ( 10h 49m 08.87s , +20d 5m 32.01s) | C | 180 | 13.6 | Filter C is a clear (unfiltred) band. The observation and reduction will continue. The message may be cited. //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 24922 SUBJECT: LIGO/Virgo S190630ag: Identification of a GW compact binary merger candidate DATE: 19/06/30 19:57:47 GMT FROM: Brandon Piotrzkowski at U of Wisconsin-Milwaukee The LIGO Scientific Collaboration and the Virgo Collaboration report: We identified the compact binary merger candidate S190630ag during real-time processing of data from LIGO Livingston Observatory (L1) and Virgo Observatory (V1) at 2019-06-30 18:52:05.180 UTC (GPS time: 1245955943.180). The candidate was found by the GstLAL [1] analysis pipeline. S190630ag is an event of interest because its false alarm rate, as estimated by the online analysis, is 1.4e-13 Hz, or about one in 1e5 years. The event's properties can be found at this URL: https://gracedb.ligo.org/superevents/S190630ag The classification of the GW signal, in order of descending probability, is BBH (94%), MassGap (5%), NSBH (<1%), Terrestrial (<1%), or BNS (<1%). Assuming the candidate is astrophysical in origin, there is strong evidence against the lighter compact object having a mass < 3 solar masses (HasNS: <1%). Using the masses and spins inferred from the signal, there is strong evidence against matter outside the final compact object (HasRemnant: <1%). One sky map is available at this time and can be retrieved from the GraceDB event page: * bayestar.fits.gz, an updated localization generated by BAYESTAR [2], distributed via GCN notice about 3 minutes after the candidate The preferred sky map at this time is bayestar.fits.gz, with 90% credible region of 8493 deg2. Marginalized over the whole sky, the a posteriori luminosity distance estimate is 1059 +/- 307 Mpc (a posteriori mean +/- standard deviation). For further information about analysis methodology and the contents of this alert, refer to the LIGO/Virgo Public Alerts User Guide . [1] Messick et al. PRD 95, 042001 (2017) [2] Singer & Price PRD 93, 024013 (2016) //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 24923 SUBJECT: LIGO/Virgo S190630ag: No counterpart candidates in HAWC observations DATE: 19/06/30 20:15:02 GMT FROM: Israel Martinez-Castellanos at UMD/HAWC The HAWC Collaboration (https://www.hawc-observatory.org) reports: The HAWC Collaboration performed a follow-up of the gravitational wave trigger S190630ag (GCN #24922). At the time of the trigger the HAWC local zenith was oriented towards (RA, Dec) = (104.0deg, 19deg). 26% of the GW candidate sky location probability fell within our observable field of view (0-45 deg zenith angle). We performed a search for a short timescale emission using 6 sliding time windows (dt = 0.3s, 1s, 3s, 10s, 30s and 100s), shifted forward in time by 20% of their width. We searched the 95% probability containment area in a timescale-dependent time period, from t0-5dt to t0+10dt, where t0 is the time of the GW trigger. No significant gamma-ray detection above the background was observed. The sensitivity of this analysis is greatly dependent on zenith angle, ranging from 0deg to 45deg for the area searched in this analysis. The 5sigma detection sensitivity to a 1s (100s) burst in the 80-800GeV energy range goes from 1.2e-06 erg/cm^2 to 1.1e-04 erg/cm^2 (6.4e-06 erg/cm^2 to 5.0e-04 erg/cm^2), depending on the zenith angle. HAWC is a TeV gamma ray water Cherenkov array located in the state of Puebla, Mexico. It is sensitive to the energy range ~0.1-100TeV, and monitors 2/3 of the sky every day with an instantaneous field-of-view of ~2 sr. //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 24924 SUBJECT: LIGO/Virgo S190630ag: No neutrino counterpart candidates in ANTARES search DATE: 19/06/30 20:43:39 GMT FROM: Alexis Coleiro at APC/U. Paris Diderot M. Ageron (CPPM/CNRS), B. Baret (APC/CNRS), A. Coleiro (APC/Universite Paris Diderot), M. Colomer (APC/Universite Paris Diderot)), D. Dornic (CPPM/CNRS), A. Kouchner (APC/Universite Paris Diderot), T. Pradier (IPHC/Universite de Strasbourg) report on behalf of the ANTARES Collaboration: Using on-line data from the ANTARES detector, we have performed a follow-up analysis of the recently reported LIGO/Virgo S190630ag event using the 90% contour of the bayestar probability map provided by the GW interferometers (GCN#24922). The ANTARES visibility at the time of the alert, together with the 50% and 90% contours of the probability map are shown at http://antares.in2p3.fr/GW/S190630ag.png . Considering the location probability provided by the LIGO/Virgo collaborations, there is a 68.6% chance that the GW emitter was in the ANTARES **upgoing** field of view at the time of the alert. No up-going muon neutrino candidate events were recorded in the ANTARES sky during a +/-500s time-window centered on the time 2019-06-30 18:52:05 and in the 90% contour of the S190630ag event. The expected number of atmospheric background events in the region visible by ANTARES is 1.25e-03 in the +/- 500s time window. An extended search during +/- 1 hour gives no up-going muon neutrino coincidence. The expected number of atmospheric background events in the region visible by ANTARES is 9.04e-03 in this larger time window. ANTARES is the largest undersea neutrino detector, installed in the Mediterranean Sea, and it is primarily sensitive to neutrinos in the TeV-PeV energy range. At 10 TeV, the median angular resolution for muon neutrinos is about 0.5 degrees. In the range 1-100 TeV ANTARES has a competitive sensitivity to this position in the sky. //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 24925 SUBJECT: LIGO/Virgo S190630ag: No counterpart candidates in INTEGRAL SPI-ACS prompt observation DATE: 19/06/30 21:30:10 GMT FROM: Alexis Coleiro at APC/U. Paris Diderot Alexis Coleiro (APC, France), F. Onori (IAPS-Roma, Italy) V. Savchenko, C. Ferrigno (ISDC/UniGE, Switzerland) J. Rodi (IAPS-Roma, Italy) S. Mereghetti (INAF IASF-Milano, Italy) on behalf of the INTEGRAL multi-messenger collaboration: https://www.astro.unige.ch/cdci/integral-multimessenger-collaboration Using INTEGRAL/SPI-ACS realtime data (following [1]) we have performed a search for a prompt gamma-ray counterpart of S190630ag (GCN 24922). At the time of the event (2019-06-30 18:52:05 UTC, hereafter T0), INTEGRAL was operating in nominal mode. The peak of the event localization probability was at an angle of 150 deg with respect to the spacecraft pointing axis. This orientation implies strongly suppressed (4% of optimal) response of ISGRI, near-optimal (94% of optimal) response of IBIS/Veto, and strongly suppressed (24% of optimal) response of SPI-ACS. The background within +/-300 seconds around the event was rather stable (excess variance 1.3). We have performed a search for any impulsive events in INTEGRAL SPI-ACS (as described in [2]) data. We do not detect any significant counterparts and estimate a 3-sigma upper limit on the 75-2000 keV fluence of 1.9e-07 erg/cm^2 (within the 50% probability containement region of the source localization) 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 ~1.6e-07 (6.9e-08) erg/cm^2/s at 1 s (8 s) time scale in 75-2000 keV energy range. For the mean reported distance of 1059.0 Mpc, this corresponds to the limit on the total isotropic equivalent energy in 1 s of 2.5e+49 erg for the short GRB spectrum and for a long GRB spectrum isotropic equivalent luminosity in 1 s (8 s) of 2.1e+49 erg/s (9.3e+48 erg/s). All results quoted are preliminary. This circular is an official product of the INTEGRAL Multi-Messenger team. [1] Savchenko et al. 2017, A&A 603, A46 [2] Savchenko et al. 2012, A&A 541A, 122S //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 24926 SUBJECT: LIGO/Virgo S190630ag: Coverage and upper limits from MAXI/GSC observations DATE: 19/06/30 23:35:26 GMT FROM: Satoshi Sugita at Aoyama Gakuin U. N. Kawai, M. Sugizaki (Tokyo Tech), H. Negoro (Nihon U.), S. Sugita, M. Serino (AGU), M. Nakajima, W. Maruyama, M. Aoki, K. Kobayashi (Nihon U.), S. Nakahira, T. Mihara, T. Tamagawa, M. Matsuoka (RIKEN), T. Sakamoto, H. Nishida, A. Yoshida (AGU), Y. Tsuboi, W. Iwakiri, R. Sasaki, H. Kawai, T. Sato (Chuo U.), M. Shidatsu (Ehime U.), M. Oeda, K. Shiraishi (Tokyo Tech), S. Ueno, H. Tomida, M. Ishikawa, Y. Sugawara, N. Isobe, R. Shimomukai, M. Tominaga (JAXA), Y. Ueda, A. Tanimoto, S. Yamada, S. Ogawa, K. Setoguchi, T. Yoshitake (Kyoto U.), H. Tsunemi, T. Yoneyama, K. Asakura, S. Ide (Osaka U.), M. Yamauchi, S. Iwahori, Y. Kurihara, K. Kurogi, K. Miike (Miyazaki U.), T. Kawamuro (NAOJ), K. Yamaoka (Nagoya U.), Y. Kawakubo (LSU) report on behalf of the MAXI team: We examined MAXI/GSC all-sky X-ray images (2-20 keV) after the LVC trigger S190630ag at 2019-06-30 18:52:05.179 UTC (GCN 24922). At the trigger time of S190630ag, the high-voltage of MAXI/GSC was off, and it was turned on at T0+176 sec (+2.9 min). The first one-orbit (92 min) scan observation with GSC after the event covered 60% of the 90% credible region of the bayestar skymap from 18:58:20 to 20:05:46 UTC (T0+375 to T0+4421 sec). No significant new source was found in the region in the one-orbit scan observation. A typical 1-sigma averaged upper limit obtained in one scan observation is 20 mCrab at 2-20 keV. If you require information about X-ray flux by MAXI/GSC at specific coordinates, please contact the submitter of this circular by email. //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 24928 SUBJECT: LIGO/Virgo S190630ag: Upper limits from Fermi-GBM Observations DATE: 19/07/01 00:42:27 GMT FROM: Cori Fletcher at USRA C.A. Wilson-Hodge (NASA/MSFC) & R. Hamburg (UAH) on behalf of the Fermi-GBM Team and the GBM-LIGO/Virgo group For S190630ag and using the initial bayestar.fits skymap, Fermi-GBM was observing 87.7% of the localization probability at event time. There was no Fermi-GBM onboard trigger around the event time of the LIGO/Virgo detection of GW trigger S190630ag (GCN 24922). An automated, blind search for short gamma-ray bursts below the onboard triggering threshold in Fermi-GBM also identified no counterpart candidates. The GBM targeted search, the most sensitive, coherent search for GRB-like signals, was run from +/-30 s around merger time, and also identified no counterpart candidates. Part of the LVC localization region is behind the Earth for Fermi, located at RA = 169.7 and Dec = -3.8 with a radius of 67.5 degrees. We therefore set upper limits on impulsive gamma-ray emission. Using the representative soft, normal, and hard GRB-like templates described in arXiv:1612.02395, we set the following 3 sigma flux upper limits over 10-1000 keV (in units of 10^-7 erg/s/cm^2): Timescale Soft Normal Hard ------------------------------------ 0.1 s: 4.4 5.8 17.0 1.0 s: 1.1 1.9 4.4 10 s: 0.47 0.56 1.0 Assuming the median luminosity distance of 1059 Mpc from the GW detection, we estimate the following intrinsic luminosity upper limits over the 1 keV-10 MeV energy range (in units of 10^49 erg/s): Timescale Soft Normal Hard ------------------------------------ 0.1 s: 9.2 10. 53. 1.0 s: 2.3 3.6 14. 10 s: 1.0 1.1 3.1 //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 24932 SUBJECT: LIGO/Virgo S190630ag: No counterpart candidates in Fermi-LAT observations DATE: 19/07/01 07:00:45 GMT FROM: Magnus Axelsson at Stockholm U. M. Axelsson (KTH and Stockholm Univ.), D. Kocevski (NASA/MSFC), F. Piron (CNRS/IN2P3/LUPM) and E. Bissaldi (Politecnico and INFN Bari) report on behalf of the Fermi-LAT Collaboration: We have searched data collected by the Fermi Large Area Telescope (LAT) on June 30, 2019, for possible high-energy (E > 100 MeV) gamma-ray emission in spatial/temporal coincidence with the LIGO/Virgo trigger S190630ag (GCN 24922). We define "instantaneous coverage" as the integral over the region of the LIGO probability map that is within the LAT field of view at a given a time, and "cumulative coverage" as the integral of the instantaneous coverage over time. Fermi-LAT had instantaneous coverage of ~20% of the LIGO probability at the time of the trigger (T0 = 2019-06-30 18:52:05.180 UTC), and reached 98% cumulative coverage after ~7.2 ks. The remaining area was not observed within 10 ks after the trigger. We performed a search for a transient counterpart within the observed region of the 90% contour of the LIGO map in a fixed time window from T0 to T0+10 ks.No significant sources were found. We also performed a search which adapted the time interval of the analysis to the exposure of each region of the sky, and no additional excesses were found. Energy flux upper bounds for the fixed time interval between 100 MeV and 1 GeV for this search vary between 2.3e-10 and 1.8e-08 [erg/cm^2/s]. The Fermi-LAT point of contact for this event is Magnus Axelsson (magaxe@kth.se). 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: 24933 SUBJECT: LIGO/Virgo S190630ag: No counterpart candidates in AGILE-MCAL observations DATE: 19/07/01 09:35:58 GMT FROM: Alessandro Ursi at INAF/IAPS C. Pittori (SSDC, and INAF/OAR), A. Ursi (INAF/IAPS), M. Tavani (INAF/IAPS, and Univ. Roma Tor Vergata), M. Cardillo, C. Casentini, G. Piano (INAF/IAPS), F. Lucarelli, F. Verrecchia (SSDC, and INAF/OAR), A. Bulgarelli, V. Fioretti, N. Parmiggiani (INAF/OAS-Bologna), M. Pilia (INAF/OA-Cagliari), F. Longo (Univ. Trieste, and INFN Trieste), report on behalf of the AGILE Team: In response to the LIGO/Virgo GW event S190630ag at T0 = 2019-06-30 18:52:05 (UT), a preliminary analysis of the AGILE minicalorimeter (MCAL) triggered data found no event candidates within a time interval covering -/+ 15 sec from the LIGO/Virgo T0. At the T0, about 60% of the S190630ag 90% c.l. localization region was accessible to the AGILE MCAL. Three-sigma upper limits (ULs) are obtained for a 1 s integration time at different celestial positions within the accessible S190630ag localization region, from a minimum of 1.6E-06 erg cm^-2 to a maximum of 7.4E-06 erg cm^-2 (assuming as spectral model a single power law with photon index 1.5). The AGILE-MCAL detector is a CsI detector with a 4 pi FoV, sensitive in the energy range 0.4-100 MeV. Additional analysis of AGILE data is in progress. //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 24938 SUBJECT: LIGO/Virgo S190630ag: No counterpart candidates in the Swift/BAT Observations DATE: 19/07/01 12:15:15 GMT FROM: Amy Lien at GSFC D. M. Palmer (LANL), S. D. Barthelmy (NASA/GSFC), A. Y. Lien (GSFC/UMBC), T. Sakamoto (AGU), A. A. Breeveld (MSSL-UCL), A. P. Beardmore (U. Leicester), D. N. Burrows (PSU), S. Campana (INAF-OAB), S. B. Cenko (NASA/GSFC), G. Cusumano (INAF-IASF PA), A. D'Ai (INAF-IASFPA), P. D'Avanzo (INAF-OAB), V. D'Elia(ASDC), S. Emery (UCL-MSSL), P. A. Evans (U. Leicester), P. Giommi (ASI), C. Gronwall (PSU), D. Hartmann (Clemson U.), J. A. Kennea (PSU), H. A. Krimm (NSF), N. P. M. Kuin (UCL-MSSL), F. E. Marshall (NASA/GSFC), A. Melandri (INAF-OAB), J. A. Nousek (PSU), S. R. Oates (Uni. of Warwick), P. T. O'Brien (U. Leicester), J. P. Osborne (U. Leicester), C. Pagani (U. Leicester), K. L. Page (U.Leicester), M. Perri (ASDC), J. L. Racusin (NASA/GSFC), B. Sbarufatti (INAF-OAB/PSU), M. H. Siegel (PSU), G. Tagliaferri (INAF-OAB), A. Tohuvavohu (PSU), E. Troja (NASA/GSFC/UMCP) report on behalf of the Swift team: We report the search results in the BAT data within T0 +/- 100 s of the LVC event S190630ag (LIGO/VIRGO Collaboration GCN Circ. 24922), where T0 is the LVC trigger time (2019-06-30T18:52:05.179 UTC). The center of the BAT FOV at T0 is RA = 223.634 deg, DEC = 41.517 deg, ROLL = 310.061 deg. The BAT Field of View (>10% partial coding) covers 4.77% of the integrated LVC localization probability, and 2.54% of the galaxy convolved probability (Evans et al. 2016). Within T0 +/- 100 s, no significant detections (signal-to-noise ratio >~ 5 sigma) are found in the BAT raw light curves with time bins of 64 ms, 1 s, and 1.6 s. Assuming an on-axis (100% coded) short GRB with a typical spectrum in the BAT energy range (i.e., a simple power-law model with a power-law index of -1.32, Lien & Sakamoto et al. 2016), the 5-sigma upper limit in the 1-s binned light curve corresponds to a flux upper limit (15-350 keV) of ~ 1.98 x 10^-7 erg/s/cm^2. Please note that because Swift slewed at T+5.8 s, the background around T0 changes significantly, and thus results in a higher standard deviation calculated using data from T0 +/- 100 s and consequently a higher flux upper limit.. No event data are available around T0. BAT retains decreased, but significant, sensitivity to rate increases for gamma-ray events outside of its FOV. About 20.35% of the integrated LVC localization probability was outside of the BAT FOV but above the Earth's limb from Swift's location, and the corresponding flux upper limits for this region are within roughly an order of magnitude higher than those within the FOV. The results of the BAT analysis are available at https://swift.gsfc.nasa.gov/results/BATbursts/team_web/S190630ag/web/source.html //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 24942 SUBJECT: LIGO/Virgo S190630ag: No counterpart candidates in AGILE-GRID observations DATE: 19/07/01 16:07:45 GMT FROM: Carlotta Pittori at ASI SSDC, INAF-OAR C. Pittori (SSDC, and INAF/OAR), A. Ursi (INAF/IAPS), M. Tavani (INAF/IAPS, and Univ. Roma Tor Vergata), M. Cardillo, C. Casentini, G. Piano (INAF/IAPS), F. Lucarelli, F. Verrecchia (SSDC, and INAF/OAR), A. Bulgarelli, V. Fioretti, N. Parmiggiani (INAF/OAS-Bologna), M. Pilia (INAF/OA-Cagliari), F. Longo (Univ. Trieste, and INFN Trieste), report on behalf of the AGILE Team: In response to the LIGO-Virgo GW event S190630ag at T0 = 2019-06-30 18:52:05.180 UTC a preliminary analysis of the AGILE exposure at T0 shows that the Gamma-Ray Imaging Detector (GRID) exposure covered less than 20% of the 90% c.l. localization region (LR) (due to Earth occultation and Solar Panel constraints). We performed an analysis of the GRID data in the energy range 50 MeV -10 GeV over time intervals before and after T0, where good exposure of the S190630ag 90% c.l. LR was available. No candidate gamma-ray transient was detected. The following preliminary GRID values of 3-sigma upper limit (UL) are obtained: from 5.9e-08 to 5.5e-06 erg cm^-2 s^-1, with exposure of about 42% of the LR over the time interval ( T0 -200s ; T0 -100s ). These measurements were obtained with AGILE observing a large portion of the sky in spinning mode. Additional analysis of AGILE data is in progress. //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 24957 SUBJECT: LIGO/Virgo S190630ag: No counterpart candidates in KAIT observation DATE: 19/07/01 23:47:13 GMT FROM: Weikang Zheng at UC Berkeley Yukei Murakami, Shaunak Modak, Sergiy Vasylyev, Benjamin Stahl, WeiKang Zheng, Andrew Hoffman, Nachiket Girish, and Alexei Filippenko (UC Berkeley) report on behalf of the Lick/KAIT GW follow-up team: The 0.76-m Katzman Automatic Imaging Telescope (KAIT), located at Lick Observatory, observed the 90% region of the gravitational-wavei event S190630ag (GCN 24922) detected by LIGO/Virgo. More than one thousand galaxies were selected from the Glade catalog V1.0 (Dalya et al., 2018, MNRAS, 479, 2374; http://aquarius.elte.hu/glade/) according to their priority score. KAIT observed 148 of them based on their priority scores and elevation visibility, with each clear-filter exposure time being 60 s. The first image was taken at 10:39:35, July 1st UT, about 16.0 hours after the trigger, and the last image at 11:18:34 UT. Our typical limiting mag is 19.0. No viable counterparts were identified and the analysis is ongoing. A full list of galaxies observed by KAIT is given below. GladeID RA_deg(J2000) Dec_deg(J2000) ----------------------------------------------- G0061445 341.9249572753906 1.907817006111145 G0092394 319.9082946777344 23.86920928955078 G0110246 316.32904052734375 12.999917984008789 G0113330 343.4059143066406 1.6700730323791504 G0128008 343.24871826171875 3.5833311080932617 G0138166 318.15472412109375 12.344159126281738 G0146771 330.15570068359375 36.799217224121094 G0176149 342.5879211425781 5.086748123168945 G0188614 317.3526306152344 12.957232475280762 G0191566 316.4395751953125 7.965785026550293 G0197115 343.0567932128906 2.2420759201049805 G0203366 317.57708740234375 17.720905303955078 G0217228 319.831787109375 13.57975959777832 G0228798 343.8270568847656 9.654282569885254 G0253695 342.6175231933594 4.694252967834473 G0259099 306.0604553222656 21.34751319885254 G0288824 318.0233459472656 21.468807220458984 G0317142 314.04083251953125 15.730732917785645 G0331434 317.4542541503906 19.71814727783203 G0343435 319.633056640625 22.522260665893555 G0353352 318.4770202636719 19.369688034057617 G0364054 309.0512390136719 14.561393737792969 G0372182 318.5006103515625 17.060741424560547 G0381768 319.09576416015625 16.906875610351562 G0401046 316.5504455566406 13.690340995788574 G0522663 319.3000183105469 18.278528213500977 G0523053 343.2687683105469 4.272221088409424 G0527283 316.3482666015625 15.099641799926758 G0534476 318.4536437988281 14.539608001708984 G0539495 318.87933349609375 20.40052032470703 G0545746 316.9638366699219 14.697251319885254 G0547445 341.9770202636719 5.525643825531006 G0554727 306.6247863769531 11.826129913330078 G0556840 341.6595153808594 -5.284846782684326 G0573762 317.7817077636719 -2.038830041885376 G0598776 341.6076354980469 -0.02823299914598465 G0602666 342.7663879394531 7.761270999908447 G0605573 342.9013671875 11.007864952087402 G0607582 342.7892150878906 14.765083312988281 G0614708 341.5901184082031 -0.0615679994225502 G0620749 327.75787353515625 36.54386901855469 G0631040 341.7713623046875 1.530542016029358 G0635624 341.1427307128906 -4.696380138397217 G0642167 341.23883056640625 -4.472480773925781 G0653922 341.8634338378906 -4.3395609855651855 G0660376 319.55120849609375 65.61320495605469 G0662217 342.4907531738281 10.862078666687012 G0689029 311.7810363769531 0.3004690110683441 G0744560 342.2490539550781 -0.039427999407052994 G0747850 341.4222717285156 -1.4947960376739502 G0751988 342.1326599121094 12.047146797180176 G0751994 342.0005187988281 12.067659378051758 G0770966 341.9466247558594 12.857375144958496 G0771349 341.1048278808594 -5.725611209869385 G0809046 315.7451477050781 10.550166130065918 G0823379 342.5821228027344 10.903489112854004 G0829519 342.0823059082031 -5.330543041229248 G0830281 305.8343811035156 20.03953742980957 G0851960 318.37353515625 16.89679718017578 G0866592 319.7909851074219 19.712661743164062 G0867336 341.8969421386719 3.8530919551849365 G0870427 343.1185607910156 7.70672082901001 G0886808 343.18524169921875 6.3733930587768555 G0888699 341.6392517089844 -2.4654040336608887 G0888752 317.9061584472656 20.872385025024414 G0898451 319.516357421875 23.73065948486328 G0915065 308.6819763183594 17.92630386352539 G0915839 305.86822509765625 23.06815528869629 G0928322 330.2781066894531 36.06706237792969 G0929178 316.63287353515625 23.183130264282227 G0932932 315.3785400390625 11.500997543334961 G0935605 307.2861328125 14.036181449890137 G0941438 316.7498474121094 16.186092376708984 G0945181 342.4139404296875 1.4307090044021606 G0952296 342.9849853515625 6.389228820800781 G0994698 316.0340881347656 14.70421314239502 G0999336 341.67108154296875 1.467797040939331 G1005682 319.7104797363281 23.598472595214844 G1008274 341.0709228515625 11.441901206970215 G1009351 317.86376953125 18.007173538208008 G1016681 306.0959777832031 20.025863647460938 G1021078 304.6157531738281 24.826311111450195 G1026057 332.6576232910156 27.30628776550293 G1034138 343.5093078613281 1.7944929599761963 G1037493 342.1183776855469 3.353332996368408 G1046084 341.8002624511719 1.3708219528198242 G1051237 319.9819030761719 19.465940475463867 G1054477 316.6243896484375 9.170035362243652 G1055764 319.5661926269531 19.174840927124023 G1067663 318.821044921875 21.971057891845703 G1077484 318.376220703125 14.921242713928223 G1079830 317.7655029296875 15.193946838378906 G1080012 315.2541809082031 12.184548377990723 G1080147 317.9605407714844 20.99880027770996 G1086075 304.7977600097656 22.706878662109375 G1090502 330.4983215332031 33.39694595336914 G1090610 331.0491027832031 38.59846115112305 G1104348 318.2252197265625 13.14095401763916 G1106349 318.9924011230469 21.520658493041992 G1107026 315.6747131347656 22.257457733154297 G1108527 319.6886901855469 19.316713333129883 G1110425 318.8880310058594 23.226354598999023 G1121342 317.30206298828125 15.693902015686035 G1125633 342.62713623046875 3.7509210109710693 G1139958 341.84130859375 -1.8711689710617065 G1140068 314.84710693359375 12.177216529846191 G1140350 317.4183654785156 15.956110954284668 G1156117 343.60394287109375 5.693478107452393 G1178742 318.2795104980469 21.693946838378906 G1185561 306.64056396484375 21.61431884765625 G1192099 342.04345703125 -4.658606052398682 G1195858 318.24822998046875 21.24338722229004 G1196493 304.9854736328125 18.736492156982422 G1198664 342.1663513183594 1.5813930034637451 G1199228 342.7058410644531 1.948989987373352 G1205282 317.37872314453125 19.153308868408203 G1212826 303.58270263671875 19.835834503173828 G1244768 342.6612854003906 4.645647048950195 G1249024 343.2779541015625 3.833332061767578 G1275042 315.7004699707031 24.66737937927246 G1275459 344.1455383300781 7.17429780960083 G1283274 341.17327880859375 0.6272280216217041 G1284258 316.2783508300781 13.577127456665039 G1301461 318.7709655761719 17.448251724243164 G1308708 318.75531005859375 12.57158374786377 G1314325 342.0331115722656 8.019875526428223 G1319236 319.9844055175781 23.858163833618164 G1334362 318.15118408203125 22.59657859802246 G1342808 341.9000549316406 -3.1834468841552734 G1361431 342.41815185546875 7.987196922302246 G1366506 318.9411926269531 22.696460723876953 G1367112 341.81072998046875 7.746367931365967 G1367500 341.3768615722656 2.083343982696533 G1369863 343.3456115722656 5.787590980529785 G1371060 305.9384460449219 19.860227584838867 G1389431 310.9674377441406 15.59082317352295 G1391634 317.9789733886719 18.553525924682617 G1398951 317.0672302246094 18.098711013793945 G1405412 317.8551940917969 18.500783920288086 G1410444 306.4672546386719 22.671737670898438 G1410599 313.4918518066406 10.406656265258789 G1417508 315.5130615234375 16.657384872436523 G1426221 319.7685852050781 13.95448112487793 G1445948 340.8894958496094 -5.12808895111084 G1449047 342.3941650390625 1.8826509714126587 G1451963 316.8103332519531 19.12601661682129 G1462570 318.6368408203125 18.65683364868164 G1738900 342.4949951171875 0.918330013751983 //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 24960 SUBJECT: LIGO/Virgo S190630ag: Upper limits from CALET observations DATE: 19/07/02 02:33:59 GMT FROM: Yuta Kawakubo at Louisiana State U./CALET M. L. Cherry (LSU), A. Yoshida, T. Sakamoto, V. Pal'shin, S. Sugita (AGU), Y. Kawakubo (LSU), K. Yamaoka (Nagoya U), S. Nakahira (RIKEN), Y. Asaoka, S. Ozawa, S. Torii (Waseda U), Y. Shimizu, T. Tamura (Kanagawa U), N. Cannady (GSFC/UMBC), S. Ricciarini (U of Florence), P. S. Marrocchesi (U of Siena), and the CALET collaboration: At the trigger time of the compact binary merger candidate S190630ag, T0 = 2019-06-30 18:52:05.180 UT (The LIGO Scientific Collaboration and Virgo Collaboration, GCN Circ. 24922), the CALET Gamma-ray Burst Monitor (CGBM) high voltages were off (from T0-15 min to T0+0.5 min). The CALET Calorimeter (CAL) was operating in the high energy trigger mode at the trigger time of S190630ag. Using the CAL data, we have searched for gamma-ray events in the 10-100 GeV band from -60 sec to +60 sec from the GW trigger time and found no candidates. The 90% upper limit of CAL is 1.2x10^-5 erg/cm^2/s (10-100 GeV) when the summed LIGO-Virgo probability reaches 25%. The CAL FOV was centered at RA= 84.0 deg, DEC= 31.5 deg at T0. //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 24963 SUBJECT: LIGO/Virgo S190630ag: Upper limits from Insight-HXMT/HE observations DATE: 19/07/02 06:26:24 GMT FROM: QiBin Yi at IHEP, HXMT Q. B. Yi, S. Xiao, C. Cai, Q. Luo, C. K. Li, X. B. Li, G. Li, J. Y. Liao, S. L. Xiong, C. Z. Liu, X. F. Li, Z. W. Li, Z. Chang, A. M. Zhang, Y. F. Zhang, X. F. Lu, C. L. Zou (IHEP), Y. J. Jin, Z. Zhang (THU), T. P. Li (IHEP/THU), F. J. Lu, L. M. Song, M. Wu, Y. P. Xu, S. N. Zhang (IHEP), report on behalf of the Insight-HXMT team: Insight-HXMT was taking data normally around the reported LIGO/Virgo S190630ag event (GCN #24922), trigger time 2019-06-30T18:52:05.18 UTC. At T0, more than 78% of the LIGO localization region was covered by Insight-HXMT without occultation by the Earth. Within T0 +/- 100 s, no significant excess events (SNR > 3 sigma) are found in a search of the Insight-HXMT/HE raw light curves. Assuming the GW counterpart GRB with three typical GRB Band spectral models, two typical duration timescales (1 s, 10 s) from the center of the LIGO-Virgo location probability map (RA=220 deg, DEC=-60 deg), the 5-sigma upper-limits fluence (0.2 - 5 MeV, incident energy) are reported below: Band model 1 (alpha=-1.9, beta=-3.7, Ep=70 keV): 1 s: 1.4e-07 erg cm^-2 10 s: 9.6e-07 erg cm^-2 Band model 2 (alpha=-1.0, beta=-2.3, Ep=230 keV): 1 s: 2.3e-07 erg cm^-2 10 s: 1.6e-06 erg cm^-2 Band model 3 (alpha=-0.0, beta=-1.5, Ep=1000 keV): 1 s: 5.3e-07 erg cm^-2 10 s: 4.5e-06 erg cm^-2 All measurements above are made with the CsI detectors operating in the regular mode with the energy range of about 80-800 keV (deposited energy). Only gamma-rays with energy greater than about 200 keV can penetrate the spacecraft and leave signals in the CsI detectors installed inside of the spacecraft. Insight-HXMT is the first Chinese space X-ray telescope, which was funded jointly by the China National Space Administration (CNSA) and the Chinese Academy of Sciences (CAS). More information could be found at: http://www.hxmt.org. //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 24974 SUBJECT: LIGO/Virgo S190630ag: no counterpart candidate in the SVOM/GWAC observations DATE: 19/07/03 15:25:11 GMT FROM: Diego Gotz at CEA D. Gotz (CEA/AIM), X.H. Han (NAOC), D. Dornic (CPPM), L.P. Xin (NAOC), D. Turpin (NAOC), Y.T. Zheng (GXU), C. Wu (NAOC) on behalf of the SVOM consortium We observed 52 sky regions (total: 7800 square degrees with overlaps) to cover the skymap of the advanced LIGO/Virgo trigger S190630ag, with SVOM/GWAC, at Xinglong Observatory equipped with a set of two types of wide angle cameras: FFOV cameras (FOV~900 square degrees/camera, aperture = 3.5 cm) and JFOV cameras (FOV~150 square degrees/camera, aperture = 18 cm). SVOM/GWAC currently comprises 4 FFOV cameras and 16 JFOV cameras, working with unfiltered band. The observations are operated in time-series mode, taking one exposure every 15 seconds (10s exposure + 5s readout). The observations were made during two nights (2019.06.30-2019.07.01). During the night of 2019.06.30, GWAC worked in survey mode. The survey area covered over 5000 square degrees, including 15.2 % of the 90% c.l. GW error box. The images were taken between ~5 hours and ~1 hour before the event trigger time, and no electromagnetic precursor has been found down to a 15.5 mag 3 sigma limit in the R band. During the night of 2019.07.01, the GWAC worked on follow-up mode. Over 5500 square degrees were observed. We estimate a 7.2% prior probability that the 19 observed and processed regions contain the true location of the source. The coordinates of the 19 sky regions and observation times are listed below: No. Ra Dec start-obs(UTC) end-obs(UTC) Camera_ID 1 15:39:28.56 -15:20:36.24 2019-07-01 13:42:36 2019-07-01 14:10:58 034 2 17:06:36.00 -06:00:32.08 2019-07-01 13:37:08 2019-07-01 14:05:27 021 3 17:53:38.64 -06:34:09.05 2019-07-01 13:48:27 2019-07-01 14:08:40 022 4 18:03:11.52 +12:48:53.64 2019-07-01 14:32:56 2019-07-01 14:34:09 031 5 18:45:49.44 +01:11:14.78 2019-07-01 14:47:55 2019-07-01 15:09:24 033 6 18:53:52.32 +18:03:08.64 2019-07-01 13:21:25 2019-07-01 13:55:51 044 7 18:52:12.48 +30:09:05.40 2019-07-01 13:51:48 2019-07-01 13:55:51 041 8 19:16:11.76 +01:05:37.93 2019-07-01 14:09:31 2019-07-01 14:48:26 044 9 20:06:25.68 +01:07:06.78 2019-07-01 14:09:31 2019-07-01 14:57:44 043 10 20:07:04.56 +13:22:56.64 2019-07-01 14:09:32 2019-07-01 14:56:31 042 11 19:16:34.56 +13:12:15.48 2019-07-01 14:23:42 2019-07-01 14:57:44 041 12 21:10:37.92 +15:33:32.76 2019-07-01 14:32:34 2019-07-01 15:06:58 023 13 20:24:27.60 +15:51:24.48 2019-07-01 14:39:51 2019-07-01 15:02:54 024 14 20:22:31.20 +27:54:07.20 2019-07-01 14:41:28 2019-07-01 14:52:24 021 15 21:15:18.72 +27:15:52.92 2019-07-01 14:51:59 2019-07-01 15:08:09 022 16 21:19:04.56 +13:22:06.60 2019-07-01 15:03:19 2019-07-01 15:25:12 042 17 22:25:53.28 +15:31:49.44 2019-07-01 15:13:30 2019-07-01 15:27:40 023 18 21:39:43.20 +15:49:36.84 2019-07-01 15:13:30 2019-07-01 15:26:27 024 19 22:30:33.12 +27:14:10.32 2019-07-01 15:13:30 2019-07-01 15:28:52 022 The sky coverage map of the night 07.01 is available at: http://cmm.svom.cn/gwpub/O3/S190630ag/S190630ag_GWAC.png (user:svomo3 pwd:gwo3) The weather conditions were good during the observations. A 3 sigma limiting magnitude of about 15.5 mag in R band was obtained in the single frames. No credible new source is detected by our online pipeline during follow-up observations. A more detailed image analysis including co-addition is ongoing with our offline pipeline to search for transient candidates. //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 24977 SUBJECT: LIGO/Virgo S190630ag: Gaia Photometric Alerts transient candidate DATE: 19/07/04 14:53:39 GMT FROM: Deepak Eappachen at SRON Netherlands Z. Kostrzewa-Rutkowska, D. Eappachen (SRON/RU), S. Hodgkin, A. Delgado, D.L. Harrison, M.van Leeuwen, G. Rixon, A. Yoldas (IoA Cambridge), P.G. Jonker (SRON/RU) on behalf of Gaia Alerts team report the discovery of a transient candidate within the probability skymap of S190630ag (LIGO/VIRGO Collaboration GCN 24922): --------------------------------------------------------------------------- Name TNSid Date [TCB] RaDeg DecDeg AlertMag URL ---------------------------------------------------------------------------- Gaia19cua AT2019kih 2019-07-02T10:26:22 219.41432 -54.98491 18.86 http://gsaweb.ast.cam.ac.uk/alerts/alert/Gaia19cua/ --------------------------------------------------------------------------- Note: Hostless galactic plane transient Acknowledgements: This work has made use of data from the European Space Agency (ESA) mission Gaia (https://www.cosmos.esa.int/gaia), processed by the Gaia Data Processing and Analysis Consortium (DPAC, https://www.cosmos.esa.int/web/gaia/dpac/consortium). Funding for the DPAC has been provided by national institutions, in particular the institutions participating in the Gaia Multilateral Agreement. ZKR, DE, and PGJ acknowledge support from the European Research Council under ERC Consolidator Grant agreement no 647208. //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 25094 SUBJECT: LIGO/Virgo S190630ag: Updated sky localization DATE: 19/07/18 20:04:07 GMT FROM: Brandon Piotrzkowski at U of Wisconsin-Milwaukee The LIGO Scientific Collaboration and the Virgo Collaboration report: We have conducted further analysis of the LIGO and Virgo data around the time of the compact binary coalescence (CBC) candidate S190630ag (GCN 24922). Parameter estimation has been performed using LALInference [1] and a new sky map, LALInference.offline.fits.gz, distributed via GCN Notice, is available for retrieval from the GraceDB event page: https://gracedb.ligo.org/superevents/S190630ag LALInference.offline.fits.gz is the preferred sky map at this time. The 90% credible region is 1483 deg2. Marginalized over the whole sky, the a posteriori luminosity distance estimate is 926 ± 259 Mpc (a posteriori mean ± standard deviation). For further information about analysis methodology and the contents of this alert, refer to the LIGO/Virgo Public Alerts User Guide . [1] Veitch et al. PRD 91, 042003 (2015)