GCN GW-based Circulars Archive
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- The Latest GW-based Circulars
This is the archive of the GCN Observation Report Circulars for GW/LIGO/LVC events.
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About GW-based events, Listed in reverse serial number order -- newest first.
This is automatically updated whenever an appropriate GW event Circular was submitted.
- 32094 VLA observations of GW170817 at ~4.8 years after the merger
- 32065 Continued Chandra monitoring of GW170817 at ~4.8 yr post-merger
- 31231 Chandra observation of GW170817 at ~1575 days since merger (all epochs)
- 31187 Chandra observation of GW170817 at ~1573 days since merger (Epoch 1 of 4)
- 29375 Continued Chandra observations of GW170817 at ~3.3 years since merger
- 29263 GW170817: HST observations at 3.4 years from merger
- 29055 Chandra observations of GW170817 at ~3.3 years since merger (Full report)
- 29053 VLA observations of GW170817 at ~3.3 years post-merger
- 29041 Potential X-ray KN afterglow from Chandra observations of GW170817 ~3.3 years since merger (3 Epochs of 4)
- 29038 Long-lasting X-ray emission from GW170817 detected by Chandra
- 29019 Chandra observations of GW170817 at ~3.3 years since merger (Observation 1 of 4)
- 27990 LIGO/Virgo MS200618aq: Retraction of a test binary neutron star candidate
- 27989 LIGO/Virgo MS200619bf: Retraction of a test binary neutron star candidate
- 27988 LIGO/Virgo MS200618bx: Retraction of a test binary neutron star candidate
- 27987 LIGO/Virgo MS200618bq: Retraction of a test binary neutron star candidate
- 27977 LIGO/Virgo MS200614ct: Identification of a test binary black hole candidate
- 27965 LIGO/Virgo MS200615ce: Identification of a test binary black hole candidate
- 27963 LIGO/Virgo MS200614bz: Test Identification of a binary neutron star candidate
- 27951 LIGO/Virgo MS200615h: Retraction of a test binary neutron star candidate
- 27526 LIGO/Virgo S200225q: Swift XRT observations, 1 X-ray sources
- 27524 LIGO/Virgo S200224ca: Swift XRT observations, 8 X-ray sources
- 27488 LIGO/Virgo S200316bj: Upper limits from Konus-Wind observations
- 27487 LIGO/Virgo S200311bg: Upper limits from Konus-Wind observations
- 27486 LIGO/Virgo S200302c: Upper limits from Konus-Wind observations
- 27485 LIGO/Virgo S200225q: Upper limits from Konus-Wind observations
- 27483 LIGO/Virgo S200224ca: Upper limits from Konus-Wind observations
- 27421 LIGO/Virgo S200316bj: no counterpart candidate in SVOM/GWAC-F30 observations
- 27419 LIGO/Virgo S200316bj: Updated Sky Localization and EM Bright Classification
- 27414 Chandra observations of GW170817 at 2.5 years since merger (All epochs 4 of 4)
- 27411 GW170817: Continued X-ray emission detected with Chandra at 940 days post-merger
- 27409 LIGO/Virgo S200316bj : No significant candidates in TAROT - FRAM - GRANDMA observations.
- 27408 LIGO/Virgo S200316bj: Upper limits from Insight-HXMT/HE observations
- 27406 LIGO/Virgo S200316bj: no counterpart candidate in SVOM/GWAC observations
- 27405 LIGO/Virgo S200316bj: Upper limits from CALET observations
- 27404 LIGO/Virgo S200316bj: No neutrino candidates at Pierre Auger Observatory
- 27403 LIGO/Virgo S200316bj: No counterpart candidates in Fermi-LAT observations
- 27402 LIGO/Virgo S200316bj: No Counterparts in DDOTI/OAN Optical Observations
- 27401 LIGO/Virgo S200316bj: no counterpart candidates in the Swift/BAT observations
- 27400 LIGO/Virgo S200213t: Continued Swift UVOT and XRT observations of ZTF20aamvmzj (AT2020cja)
- 27397 LIGO/Virgo S200316bj: No counterpart candidates in INTEGRAL SPI-ACS, and IBIS prompt observation
- 27396 LIGO/Virgo S200316bj: upper limits from AGILE/GRID observations
- 27395 LIGO/Virgo S200316bj: upper limits from AGILE/MCAL observations
- 27394 LIGO/Virgo S200316bj: Upper limits from Fermi-GBM Observations
- 27391 LIGO/Virgo S200316bj: Coverage and upper limits from MAXI/GSC observations
- 27390 LIGO/Virgo S200316bj : no neutrino counterpart candidate in ANTARES search
- 27389 LIGO/Virgo S200316bj: Upper limits from IceCube neutrino searches
- 27388 LIGO/Virgo S200316bj: Identification of a GW compact binary merger candidate
- 27387 LIGO/Virgo S200316bj: Global MASTER-Net observations report
- 27382 LIGO/Virgo S200311bg: Updated Sky Localization and EM Bright Classification
- 27372 LIGO/Virgo S200311bg: Not observable by CALET
- 27369 LIGO/Virgo S200311bg: Swift/BAT in the South Atlantic Anomaly
- 27368 LIGO/Virgo S200311bg: No significant counterpart candidates in Fermi-LAT observations
- 27366 LIGO/Virgo S200224ca: DESGW Summary of DECam Observations
- 27364 LIGO/Virgo S200311bg: not observable by Fermi GBM
- 27362 LIGO/Virgo S200311bg: Coverage and upper limits from MAXI/GSC observations
- 27361 LIGO/Virgo S200311bg: not observable by AGILE at the event time
- 27360 LIGO/Virgo S200311bg: No counterpart candidates in INTEGRAL SPI-ACS,prompt observation
- 27359 LIGO/Virgo S200311bg: Upper limits from IceCube neutrino searches
- 27358 LIGO/Virgo S200311bg: Identification of a GW compact binary merger candidate
- 27357 Chandra observations of GW170817 /Home/xtelab/bacodine 2.5 years since merger (epoch 1 of 4)
- 27347 LIGO/Virgo S200308e: Retraction of GW compact binary merger candidate
- 27330 LIGO/Virgo S200302c: No notable candidates in GOTO imaging
- 27322 LIGO/Virgo S200302c : No significant candidates in FRAM - TAROT - GRANDMA observations.
- 27317 LIGO/Virgo S200225q: No notable candidates in GOTO imaging
- 27315 LIGO/Virgo S200302c: AstroSat CZTI upper limits
- 27310 LIGO/Virgo S200302c: Upper limits from Insight-HXMT/HE observations
- 27306 LIGO/Virgo S200303ba: Retraction of GW compact binary merger candidate
- 27299 LIGO/Virgo S200302c: No transient candidates in CALET observations
- 27293 LIGO/Virgo S200224ca: No counterpart candidates in TOROS observations
- 27292 LIGO/Virgo S200302c: Updated Sky Localization
- 27291 LIGO/Virgo S200302c: No significant counterpart candidates in Fermi-LAT observations
- 27290 LIGO/Virgo S200302c: No counterpart candidates in KAIT observations
- 27289 LIGO/Virgo S200302c: no counterpart candidates in the Swift/BAT observations
- 27288 LIGO/Virgo S200224ca: Transient found in Swift/UVOT counterpart search
- 27287 LIGO/Virgo S200302c: No counterpart candidates in HAWC observations
- 27286 LIGO/Virgo S200302c: Upper limits from Fermi-GBM Observations
- 27285 LIGO/Virgo S200302c: No counterpart candidates in INTEGRAL SPI-ACS and IBIS prompt observation
- 27284 LIGO/Virgo S200302c : no neutrino counterpart candidate in ANTARES search
- 27283 LIGO/Virgo S200302c: upper limits from AGILE/MCAL observations
- 27282 LIGO/Virgo S200225q: AstroSat CZTI upper limits
- 27281 LIGO/Virgo S200219ac: AstroSat CZTI upper limits
- 27280 LIGO/Virgo S200302c: Coverage and upper limits from MAXI/GSC observations
- 27279 LIGO/Virgo S200302c: Upper limits from IceCube neutrino searches
- 27278 LIGO/Virgo S200302c: Identification of a GW compact binary merger candidate
- 27277 LIGO/Virgo S200302c: Global MASTER-Net observations report
- 27275 LIGO/Virgo S200225q : No significant candidates in TAROT - FRAM - GRANDMA observations.
- 27262 LIGO/Virgo S200224ca: Updated Sky Localization and EM Bright Classification
- 27258 SUBJECT : LIGO/Virgo S200213t: No significant EM counterparts identified from continued GECKO observation of host galaxy candidates
- 27238 LIGO/Virgo S200224ca : No significant candidates in TAROT - FRAM - GRANDMA observations
- 27232 LIGO/Virgo S200225q: Not observable by CALET
- 27231 LIGO/Virgo S200224ca: Upper limits from CALET observations.
- 27230 LIGO/Virgo S200224car: GRAWITA VST-ESO PARANAL observations.
- 27229 LIGO/Virgo S200225q: Updated Sky Localization
- 27227 LIGO/Virgo S200224ca: DESGW Optical counterpart candidates from DECam
- 27225 LIGO/Virgo S200219ac: Upper limits from Konus-Wind observations
- 27224 LIGO/Virgo S200213t: Upper limits from Konus-Wind observations
- 27223 LIGO/Virgo S200208q: Upper limits from Konus-Wind observations
- 27221 LIGO/Virgo S200225q: no counterpart candidate in SVOM/GWAC observations
- 27220 LIGO/Virgo S200225q: Upper limits from Insight-HXMT/HE observations
- 27219 LIGO/Virgo S200224ca: Upper limits from Insight-HXMT/HE observations
- 27217 LIGO/Virgo S200225q: no counterpart candidates in the Swift/BAT observations
- 27216 LIGO/Virgo S200224ca: no counterpart candidates in the Swift/BAT observations
- 27214 LIGO/Virgo S200219ac: Updated Sky Localization
- 27213 LIGO/Virgo S200224ca: No counterpart candidates in KAIT observations
- 27212 LIGO/Virgo S200224ca: No Counterparts in DDOTI/OAN Optical Observations
- 27211 LIGO/Virgo S200224ca: GRAWITA-Campo Imperatore observations.
- 27209 LIGO/Virgo S200225q: Upper limits from Fermi-GBM Observations
- 27207 LIGO/Virgo S200225q: No counterpart candidates in Fermi-LAT observations
- 27206 LIGO/Virgo S200225q: upper limits from AGILE/GRID observations
- 27205 LIGO/Virgo S200224ca: Subaru/Hyper Suprime-Cam follow-up observations
- 27204 LIGO/Virgo S200225q: upper limits from AGILE/MCAL observations
- 27203 LIGO/Virgo S200225q: Upper limits from IceCube neutrino searches
- 27202 LIGO/Virgo S200225q: No counterpart candidates in HAWC observations
- 27201 LIGO/Virgo S200225q : no neutrino counterpart candidate in ANTARES search
- 27200 LIGO/Virgo S200225q: Global MASTER-Net observations report
- 27199 LIGO/Virgo S200224ca: No counterpart candidates in Fermi-LAT observations
- 27198 LIGO/Virgo S200225q: No counterpart candidates in INTEGRAL SPI-ACS and IBIS prompt observation
- 27197 LIGO/Virgo S200225q: Coverage and upper limits from MAXI/GSC observations
- 27196 LIGO/Virgo S200219ac: No counterpart candidates from Nanshan/NEXT observations
- 27195 LIGO/Virgo S200224ca: upper limits from AGILE/GRID observations
- 27193 LIGO/Virgo S200225q: Identification of a GW compact binary merger candidate The LIGO Scientific Collaboration and the Virgo Collaboration
- 27192 LIGO/Virgo S200224ca: not observable by Fermi-GBM
- 27190 LIGO/Virgo S200224ca: No counterpart candidates in INTEGRAL SPI-ACS prompt observation
- 27188 LIGO/Virgo S200224ca: Coverage and upper limits from MAXI/GSC observations
- 27187 LIGO/Virgo S200224ca: upper limits from AGILE/MCAL observations
- 27186 LIGO/Virgo S200224ca: Global MASTER-Net observations report
- 27185 LIGO/Virgo S200224ca: Upper limits from IceCube neutrino searches
- 27184 LIGO/Virgo S200224ca: Identification of a GW compact binary merger candidate The LIGO Scientific Collaboration and the Virgo Collaboration
- 27170 LIGO/Virgo S200219ac: no counterpart candidate in SVOM/GWAC-F30 observations
- 27169 LIGO/Virgo S200219ac: no counterpart candidate in SVOM/GWAC observations
- 27168 LIGO/Virgo S200219ac : No significant candidates in TAROT - FRAM - GRANDMA observations.
- 27167 IPN triangulation of GRB 200219B (inconsistent with the LIGO/Virgo S200219ac)
- 27160 LIGO/Virgo S200219ac: No counterpart candidates in KAIT observations
- 27154 LIGO/Virgo S200213t: AT2020clw/ZTF20aanaoyz, AT2020crd/ZTF20aanakge and AT2020cly/ZTF20aanakes 10.4m GTC spectroscopy
- 27153 LIGO/Virgo S200213t: Swift UVOT and XRT observations of ZTF20aamvmzj (AT2020cja)
- 27149 LIGO/Virgo S200219ac: No transient candidates in CALET observations
- 27147 LIGO/Virgo S200219ac: no counterpart candidates in the Swift/BAT observations
- 27144 LIGO/Virgo S200219ac: Fermi GBM transient event not confidently associated with GW signal
- 27143 LIGO/Virgo S200219ac: No counterpart candidates in Fermi-LAT observations
- 27141 LIGO/Virgo S200219ac: upper limits from AGILE/GRID observations
- 27140 LIGO/Virgo S200213t: Keck/LRIS spectroscopy of counterpart candidates from the Zwicky Transient Facility
- 27136 LIGO/Virgo S200219ac: upper limits from AGILE/MCAL observations
- 27135 LIGO/Virgo S200219ac : no neutrino counterpart candidate in ANTARES search
- 27134 LIGO/Virgo S200219ac: Upper limits from IceCube neutrino searches
- 27133 LIGO/Virgo S200219ac: No counterpart candidates in HAWC observations
- 27132 LIGO/Virgo S200219ac: Coverage and upper limits from MAXI/GSC observations
- 27131 LIGO/Virgo S200219ac: No counterpart candidates in INTEGRAL SPI-ACS and IBIS prompt observation
- 27130 LIGO/Virgo S200219ac: Identification of a GW compact binary merger candidate
- 27129 LIGO/Virgo S200219ac: Global MASTER-Net observations report
- 27121 LIGO/Virgo (S200213t/IceCube neutrino candidate: No counterpart candidates in the Swift-XRT Observations
- 27119 LIGO/Virgo S200213t: No EM counterparts found from continued GECKO observation of host galaxy candidates
- 27118 LIGO/Virgo S200213t: APO Upper Limits for ZTF20aanakes/AT2020cly
- 27116 LIGO/Virgo S200213t : No significant candidates in FRAM - OAJ - TAROT - GRANDMA observations
- 27111 LIGO/Virgo S200213t: AstroSat CZTI upper limits
- 27096 LIGO/Virgo S200213t: Updated Sky Localization
- 27095 LIGO/Virgo S200213t: Updated coverage and candidate list for the Zwicky Transient Facility
- 27094 LIGO/Virgo S200213t: CLU/NED Galaxies in the 4-Update Localization Volume
- 27093 LIGO/Virgo S200213t: Possible host galaxies in the bilby skymap
- 27092 LIGO/Virgo S200213t: Updated Sky Localization
- 27085 LIGO/Virgo S200213t: Pre-discovery detections of MASTER OT J044008.76-651302.3
- 27084 LIGO/Virgo S200213t: No transient candidates in CALET observations
- 27082 LIGO/Virgo S200213t: Lulin Follow-Up Observations
- 27077 LIGO/Virgo S200213t: MASTER possible Kilonova candidate in PGC315337
- 27076 LIGO/Virgo S200213t: No neutrino candidates at Pierre Auger Observatory
- 27075 LIGO/Virgo S200213t: P200 Spectroscopy of ZTF20aanakcd/AT2020cmr
- 27074 LIGO/Virgo S200213t: DBSP spectroscopy of AT2020cjb/ZTF20aamvnth, AT2020cja/ZTF20aamvmzj, AT2020cjc/ZTF20aamvoeh
- 27073 LIGO/Virgo S200114f: Gemini Spectra of AT 2020vu, AT 2020vw, AT 2020vy, and AT 2020vz
- 27072 LIGO/Virgo S200213t: MASTER OT detection in PGC673735
- 27071 LIGO/Virgo S200213t: Upper limits from Insight-HXMT/HE observations
- 27070 LIGO/Virgo S200213t: No counterpart candidates from Nanshan-0.6m observations
- 27069 LIGO/Virgo S200213t: No notable candidates in GOTO imaging
- 27068 LIGO/Virgo S200213t: One additional candidate from the Zwicky Transient Facility
- 27067 LIGO/Virgo S200213t: No Counterparts from GECKO observation of host galaxy candidates in GW-neutrino detection overlap area
- 27066 LIGO/Virgo S200213t: No candidates found in J-GEM follow-up observations
- 27065 LIGO/Virgo S200213t: More Candidates from the Zwicky Transient Facility
- 27064 LIGO/Virgo S200213t: No counterpart candidates in KAIT observations
- 27063 LIGO/Virgo S200213t: AT2020ciz/ZTF20aamvnat, AT2020cjb/ZTF20aamvnth and 2020cjf/ZTF20aamvodd 10.4m GTC spectroscopy
- 27062 LIGO/Virgo S200213t: No counterpart candidates in Fermi-LAT observations
- 27061 LIGO/Virgo S200213t: No Counterparts in DDOTI/OAN Optical Observations
- 27060 LIGO/Virgo S200213t: AT2020ciy/ZTF20aamvqxl, AT2020cjg/ZTF20aamvoxx and AT2020cje/ZTF20aamvtip 10.4m GTC spectroscopy
- 27059 LIGO/Virgo S200213t: MANGROVE catalog galaxy ranking
- 27058 LIGO/Virgo S200213t: Swift/BAT in the South Atlantic Anomaly
- 27057 LIGO/Virgo S191213g: AT2019wxt Wendelstein optical observations
- 27056 LIGO/Virgo S200213t: not observable by Fermi-GBM
- 27055 LIGO/Virgo S200213t: upper limits from AGILE/GRID observations
- 27054 LIGO/Virgo S200208q : No significant candidates in TAROT - FRAM - GRANDMA observations
- 27053 LIGO/Virgo S200208q: no counterpart candidate in SVOM/C-GFT observations
- 27052 LIGO/VIRGO S200213t: upper limits from AGILE/MCAL observations
- 27051 LIGO/Virgo S200213t: Candidates from the Zwicky Transient Facility
- 27050 LIGO/Virgo S200213t: No counterpart candidates in INTEGRAL SPI-ACS prompt observation
- 27049 LIGO/Virgo S200213t : no neutrino counterpart candidate in ANTARES search
- 27048 LIGO/Virgo S200213t: Coverage and upper limits from MAXI/GSC observations
- 27047 LIGO/Virgo S200213t: Neutrino and galaxies cross-match
- 27045 LIGO/Virgo trigger S200213t: Possible host galaxies
- 27044 LIGO/Virgo S200213t: NED Galaxies in the 90% Localization Volume
- 27043 LIGO/Virgo S200213t: 1 counterpart neutrino candidate from IceCube neutrino searches
- 27042 LIGO/Virgo S200213t: Identification of a GW compact binary merger candidate
- 27041 LIGO/Virgo S200213t: Global MASTER-Net observations report
- 27036 LIGO/Virgo S200208q: Updated Sky Localization
- 27033 LIGO/Virgo S200208q: No counterpart candidates in KAIT observations
- 27030 LIGO/Virgo S200208q: Not observable by CALET
- 27028 LIGO/Virgo S200208q: No counterpart candidates in Fermi-LAT observations
- 27026 LIGO/Virgo S200129m: Upper limits from Insight-HXMT/HE observations
- 27024 LIGO/Virgo S200208q: Coverage and upper limits from MAXI/GSC observations
- 27023 LIGO/Virgo S200208q: no counterpart candidates in the Swift/BAT observations
- 27022 LIGO/Virgo S200208q: Upper limits from Fermi-GBM Observations
- 27021 LIGO/Virgo S200208q : upper limits from AGILE/GRID observations
- 27020 LIGO/Virgo S200208q: upper limits from AGILE/MCAL observations
- 27019 LIGO/Virgo S200208q: No counterpart candidates in INTEGRAL SPI-ACS prompt observation
- 27018 LIGO/Virgo S200208q: Global MASTER-Net observations report
- 27017 LIGO/Virgo S200208q: No counterpart candidates in HAWC observations
- 27016 LIGO/Virgo S200208q : no neutrino counterpart candidate in ANTARES search
- 27015 LIGO/Virgo S200208q: Upper limits from IceCube neutrino searches
- 27014 LIGO/Virgo S200208q: Identification of a GW compact binary merger candidate
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This file was last modified by a human on 24-May-20.