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"bibcode": "2025GCN.39928....1I",
"eventId": "LIGO/Virgo/KAGRA S250329fl",
"subject": "LIGO/Virgo/KAGRA S250329fl: 2 counterpart neutrino candidate events from an IceCube neutrino search",
"createdOn": 1743267205836,
"submitter": "Zsuzsa Marka at IceCube/Columbia University <zsuzsa@astro.columbia.edu>",
"circularId": 39928,
"submittedHow": "web"
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"message_text": "IceCube Collaboration (http://icecube.wisc.edu/) reports:\n\nWe have performed a search for track-like muon neutrino candidate events detected by IceCube consistent with the sky localization of the low-significance gravitational-wave candidate event S250329fl in a time range of 1000 seconds centered on the alert event time (2025-03-29T14:58:44.29 UTC to 2025-03-29T15:15:24.29 UTC) [1,2]. During this time period, IceCube was collecting good quality data. A single hypothesis test was conducted using a Bayesian approach to quantify the joint GW + neutrino event significance, which assumes a binary merger scenario and accounts for known astrophysical priors, such as GW source distance, in the statistical significance estimation [3]. \n\nTwo track-like events were found in spatial and temporal coincidence with the gravitational-wave candidate S250329fl calculated from the map circulated in the S250329fl-2-Preliminary notice. This represents an overall p-value of 5.05e-05 for the Bayesian search. The p-value measures the consistency of the observed track-like events with the known atmospheric backgrounds for this single map (not accounting for statistical trials from multiple GW events). \n\nFurther details are available at https://gcn.nasa.gov/missions/icecube and at https://roc.icecube.wisc.edu/public/LvkNuTrackSearch.\n\nProperties of the coincident events are shown below:\n\n dt(s) RA(deg) Dec(deg) Angular uncertainty(deg) p-value(Bayesian)\n-------------------------------------------------------------------------------------\n 390.16 279.03\t -49.69 \t0.98\t\t\t0.0000505\n 153.42\t 87.16\t 47.51\t\t4.07\t\t\t0.0915\n\nwhere:\ndt = Time of track event minus time of GW trigger (sec)\nAngular uncertainty = Angular uncertainty of track event: the radius of a circle \n representing 90% CL containment by area.\np-value = the p-value for this specific track event from this search.\n\nThe IceCube Neutrino Observatory is a cubic-kilometer neutrino detector operating at the \ngeographic South Pole, Antarctica. The IceCube realtime alert point of contact can be \nreached at roc@icecube.wisc.edu\n\n[1] M. G. Aartsen et al 2020 ApJL 898 L10\n[2] Abbasi et al. Astrophys.J. 944 (2023) 1, 80\n[3] I. Bartos et al. 2019 Phys. Rev. D 100, 083017",
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"submitter": "cody.messick-30d512c8",
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],
"references": [
{
"id": 196812,
"topic": "gcn.circulars",
"uuid": "1aa8f78b-cbe5-4250-abdf-7daf798c323a",
"title": "LIGO/Virgo/KAGRA S250328ae: DECam DESGW Candidates (Final Epochs)",
"submitter": "Isaac McMahon at University of Zürich <isaac.mcmahon@ligo.org>",
"authors": "Isaac McMahon at University of Zürich <isaac.mcmahon@ligo.org>",
"data": {
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/40455"
},
"format": "text/markdown",
"$schema": "https://gcn.nasa.gov/schema/v4.3.2/gcn/circulars.schema.json",
"bibcode": "2025GCN.40455....1M",
"eventId": "LIGO/Virgo/KAGRA S250328ae",
"subject": "LIGO/Virgo/KAGRA S250328ae: DECam DESGW Candidates (Final Epochs)",
"createdOn": 1747158336130,
"submitter": "Isaac McMahon at University of Zürich <isaac.mcmahon@ligo.org>",
"circularId": 40455,
"submittedHow": "web"
},
"message_text": "Isaac McMahon, Sean MacBride, Marcelle Soares-Santos (UZH), Simran Kaur (U. of Michigan/UZH), Lillian Joseph (Benedictine U.), Ken Herner, Tom Diehl (Fermilab), Haibin Zhang, Mitsuru Kokubo, Nozomu Tominaga, Yousuke Utsumi, Michitoshi Yoshida (NAOJ), Tomoki Morokuma (Chiba Tech), Akira Arai, Wanqui He, Yuki Moritani, Masato Onodera, Vera Maria Passegger, Ichi Tanaka, Kiyoto Yabe (NAOJ) report on behalf of the Dark Energy Survey Gravitational Wave (DESGW) Team, the Japanese Collaboration for Gravitational-Wave Electro-Magnetic Follow-up (J-GEM), and Subaru Telescope:\n\nAt 01:20 UTC April 6th and 00:14 UTC April 25th, the Dark Energy Camera (DECam) began the third and fourth epochs of observations in final response to the LVK alert issued for the candidate gravitational-wave event S250328ae (GCN 39898). The pointings of these observations were identical to the first epoch observations from March 29th, 2025 (GCN 39934). All fields were observed in DECam r, i, and z filters with 90-second exposures. The limiting magnitude achieved is ~21.3 in r-band, ~21.2 in i-band, and ~21.0 in z-band for the third epoch and ~22.3 in r-band, ~22.1 in i-band, and ~21.6 in z-band for the fourth.\n\nWe process the images with our difference imaging pipeline (Herner et al. 2020) using DES and public DECam images as templates. We employ the autoscan machine learning code (Goldstein et al 2015) to reject subtraction artifacts, requiring an autoscan score of at least 0.7 on at least 3 nights of observations. We also match our candidates against the ALLWISE, Milliquas, Quaia, and LQAC-6 AGN catalogs (Secrest et al 2015, Flesch 2023, Storey-Fisher et al 2024, Souchay et al 2024) within the LVK localization volume. Of the 88 AGNs which exhibited transient variability in our observations, none lay within the localization volume.\n\nOf the 25 high confidence candidates reported previously (GCN 39992), 15 were observed by the J-GEM collaboration, using the Subaru Telescope Prime Focus Spectrograph (PFS), and ruled out by spectral identification and redshift (GCN 40221). Another 8 candidates either did not exhibit any further transient activity after the first two epochs or were determined to be likely stellar in origin. The final 2 candidates were not within the footprint observed by J-GEM and thus could not be determined. We report these two candidates and one last candidate which was observed only in the most recent epochs below, all likely of supernova origin.\n\n| TYPE | ID | ATNAME | RA | DEC | MAG_R | MAG_R_ERR | MAG_I | MAG_I_ERR | MAG_Z | MAG_Z_ERR |\n| -------- | ------- | --------- | ---------- | ---------- | ----- | ---- | ----- | ---- | ----- | ---- |\n| SN_LIKE | 2290001 | AT2025avp | 144.806008 | 10.632223 | 20.36 | 0.02 | 20.19 | 0.02 | 20.22 | 0.06 |\n| SN_LIKE | 2291473 | AT2025gem | 144.706509 | 11.560317 | 20.92 | 0.03 | 21.03 | 0.15 | 21.22 | 0.10 |\n| SN_LIKE | 2295351 | AT2025kjv | 143.077064 | 7.385021 | 22.3 | 0.10 | 21.81 | 0.07 | 22.86 | 0.44 |\n\nAdditionally, J-GEM reported 5 QSOs which had a redshift consistent with the localization volume. We do not find any evidence of any transient variability for any of these QSOs in our observations after the detection of S250328ae. We also do not recover any of the X-ray source candidates reported by Swift XRT (GCN 39972) within their reported error bounds. Thus, apart from the possibility that the three supernova-like candidates reported above are related to S250328ae, we find no suitable optical counterpart candidate for this binary black hole gravitational wave event.\n\nThe DECam Search & Discovery Program for Optical Signatures of Gravitational Wave Events (DESGW) is carried out by the Dark Energy Survey (DES) collaboration in partnership with wide-ranging groups in the community. DESGW uses data obtained with the Dark Energy Camera (DECam), which was constructed by the DES collaboration with support from the Department of Energy and member institutions, and utilizes data as distributed by the Science Data Archive at NOIRLAB. NOIRLAB is operated by the Association of Universities for Research in Astronomy (AURA) under a cooperative agreement with the National Science Foundation. We thank the Cerro Tololo observatory staff for their support in acquiring these observations. We also thank the J-GEM and Swift XRT teams for their contribution and support.\n\t \t\t \t\t \t \t \t\t\nWe are grateful to the staff at NAOJ and Subaru Telescope for their contributions to the deployments of PFS hardware and software, and the preparations of PFS system integration, engineering observations, and various other engineering works. Our thanks should also be propagated to the administrative staffs at Kavli IPMU, NAOJ, Subaru Telescope, and all the PFS institutes for kind support in such aspects as finances, contracts, asset managements, and so on.\nThis research is based on data collected at the Subaru Telescope, which is operated by the National Astronomical Observatory of Japan. We are honored and grateful for the opportunity of observing the Universe from Maunakea, which has cultural, historical, and natural significance in Hawaii.",
"published": "2025-05-19T08:11:24.674649Z",
"message_parser": "GCN Circular Parser v2",
"retracted": false,
"created": "2025-05-19T08:11:24.674674Z",
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},
{
"id": 195264,
"topic": "gcn.circulars",
"uuid": "edd2f07f-ad56-4aca-b34f-65bf215e6a48",
"title": "LIGO/Virgo/KAGRA S250328ae: DECam DESGW Candidates (Final Epochs)",
"submitter": "Isaac McMahon at University of Zürich <isaac.mcmahon@ligo.org>",
"authors": "Isaac McMahon at University of Zürich <isaac.mcmahon@ligo.org>",
"data": {
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"subject": "LIGO/Virgo/KAGRA S250328ae: DECam DESGW Candidates (Final Epochs)",
"createdOn": 1747158336130,
"submitter": "Isaac McMahon at University of Zürich <isaac.mcmahon@ligo.org>",
"circularId": 40455,
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},
"message_text": "Isaac McMahon, Sean MacBride, Marcelle Soares-Santos (UZH), Simran Kaur (U. of Michigan/UZH), Lillian Joseph (Benedictine U.), Ken Herner, Tom Diehl (Fermilab), Haibin Zhang, Mitsuru Kokubo, Nozomu Tominaga, Yousuke Utsumi, Michitoshi Yoshida (NAOJ), Tomoki Morokuma (Chiba Tech), Akira Arai, Wanqui He, Yuki Moritani, Masato Onodera, Vera Maria Passegger, Ichi Tanaka, Kiyoto Yabe (NAOJ) report on behalf of the Dark Energy Survey Gravitational Wave (DESGW) Team, the Japanese Collaboration for Gravitational-Wave Electro-Magnetic Follow-up (J-GEM), and Subaru Telescope:\n\nAt 01:20 UTC April 6th and 00:14 UTC April 25th, the Dark Energy Camera (DECam) began the third and fourth epochs of observations in final response to the LVK alert issued for the candidate gravitational-wave event S250328ae (GCN 39898). The pointings of these observations were identical to the first epoch observations from March 29th, 2025 (GCN 39934). All fields were observed in DECam r, i, and z filters with 90-second exposures. The limiting magnitude achieved is ~21.3 in r-band, ~21.2 in i-band, and ~21.0 in z-band for the third epoch and ~22.3 in r-band, ~22.1 in i-band, and ~21.6 in z-band for the fourth.\n\nWe process the images with our difference imaging pipeline (Herner et al. 2020) using DES and public DECam images as templates. We employ the autoscan machine learning code (Goldstein et al 2015) to reject subtraction artifacts, requiring an autoscan score of at least 0.7 on at least 3 nights of observations. We also match our candidates against the ALLWISE, Milliquas, Quaia, and LQAC-6 AGN catalogs (Secrest et al 2015, Flesch 2023, Storey-Fisher et al 2024, Souchay et al 2024) within the LVK localization volume. Of the 88 AGNs which exhibited transient variability in our observations, none lay within the localization volume.\n\nOf the 25 high confidence candidates reported previously (GCN 39992), 15 were observed by the J-GEM collaboration, using the Subaru Telescope Prime Focus Spectrograph (PFS), and ruled out by spectral identification and redshift (GCN 40221). Another 8 candidates either did not exhibit any further transient activity after the first two epochs or were determined to be likely stellar in origin. The final 2 candidates were not within the footprint observed by J-GEM and thus could not be determined. We report these two candidates and one last candidate which was observed only in the most recent epochs below, all likely of supernova origin.\n\n| TYPE | ID | ATNAME | RA | DEC | MAG_R | MAG_R_ERR | MAG_I | MAG_I_ERR | MAG_Z | MAG_Z_ERR |\n| -------- | ------- | --------- | ---------- | ---------- | ----- | ---- | ----- | ---- | ----- | ---- |\n| SN_LIKE | 2290001 | AT2025avp | 144.806008 | 10.632223 | 20.36 | 0.02 | 20.19 | 0.02 | 20.22 | 0.06 |\n| SN_LIKE | 2291473 | AT2025gem | 144.706509 | 11.560317 | 20.92 | 0.03 | 21.03 | 0.15 | 21.22 | 0.10 |\n| SN_LIKE | 2295351 | AT2025kjv | 143.077064 | 7.385021 | 22.3 | 0.10 | 21.81 | 0.07 | 22.86 | 0.44 |\n\nAdditionally, J-GEM reported 5 QSOs which had a redshift consistent with the localization volume. We do not find any evidence of any transient variability for any of these QSOs in our observations after the detection of S250328ae. We also do not recover any of the X-ray source candidates reported by Swift XRT (GCN 39972) within their reported error bounds. Thus, apart from the possibility that the three supernova-like candidates reported above are related to S250328ae, we find no suitable optical counterpart candidate for this binary black hole gravitational wave event.\n\nThe DECam Search & Discovery Program for Optical Signatures of Gravitational Wave Events (DESGW) is carried out by the Dark Energy Survey (DES) collaboration in partnership with wide-ranging groups in the community. DESGW uses data obtained with the Dark Energy Camera (DECam), which was constructed by the DES collaboration with support from the Department of Energy and member institutions, and utilizes data as distributed by the Science Data Archive at NOIRLAB. NOIRLAB is operated by the Association of Universities for Research in Astronomy (AURA) under a cooperative agreement with the National Science Foundation. We thank the Cerro Tololo observatory staff for their support in acquiring these observations. We also thank the J-GEM and Swift XRT teams for their contribution and support.\n\t \t\t \t\t \t \t \t\t\nWe are grateful to the staff at NAOJ and Subaru Telescope for their contributions to the deployments of PFS hardware and software, and the preparations of PFS system integration, engineering observations, and various other engineering works. Our thanks should also be propagated to the administrative staffs at Kavli IPMU, NAOJ, Subaru Telescope, and all the PFS institutes for kind support in such aspects as finances, contracts, asset managements, and so on.\nThis research is based on data collected at the Subaru Telescope, which is operated by the National Astronomical Observatory of Japan. We are honored and grateful for the opportunity of observing the Universe from Maunakea, which has cultural, historical, and natural significance in Hawaii.",
"published": "2025-05-13T17:45:43.200872Z",
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"created": "2025-05-13T17:45:43.200890Z",
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},
{
"id": 186664,
"topic": "gcn.circulars",
"uuid": "31f38718-5018-4c16-8aff-829fa4876e03",
"title": "LIGO/Virgo/KAGRA S250328ae: Subaru/PFS Spectroscopic Follow up and Candidates",
"submitter": "Haibin Zhang at National Astronomical Observatory of Japan (NAOJ) <haibin.zhang@nao.ac.jp>",
"authors": "Haibin Zhang at National Astronomical Observatory of Japan (NAOJ) <haibin.zhang@nao.ac.jp>",
"data": {
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"subject": "LIGO/Virgo/KAGRA S250328ae: Subaru/PFS Spectroscopic Follow up and Candidates",
"createdOn": 1745471531232,
"submitter": "Haibin Zhang at National Astronomical Observatory of Japan (NAOJ) <haibin.zhang@nao.ac.jp>",
"circularId": 40221,
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},
"message_text": "Haibin Zhang, Mitsuru Kokubo, Nozomu Tominaga, Yousuke Utsumi, Michitoshi Yoshida (NAOJ), Tomoki Morokuma (Chiba Tech), Akira Arai, Wanqui He, Yuki Moritani, Masato Onodera, Vera Maria Passegger, Ichi Tanaka, Kiyoto Yabe (NAOJ), Sean MacBride, Isaac McMahon, Marcelle Soares-Santos (UZH), Ken Herner (Fermilab), Simran Kaur (University of Michigan/UZH), Lillian Joseph (Benedictine U.), and Tom Diehl (FNAL) report on behalf of the Japanese Collaboration for Gravitational-Wave Electro-Magnetic Follow-up (J-GEM), Subaru Telescope, and Dark Energy Survey Gravitational Wave (DESGW) Team:\n\nBetween 05:11 and 10:20 UTC on April 3, 2025, we carried out spectroscopic observations with the Subaru/Prime Focus Spectrograph (PFS) following the LVK alert issued for the gravitational-wave event S250328ae (GCN 39898). The Subaru/PFS is a fiber spectrograph capable of observing ~2400 targets simultaneously within a ~1.25 square degree field of view, and covers a wavelength range of 380 nm to 1260 nm with a resolving power of ~2500-5500 (Sugai et al. 2015; Tamura et al. 2024). We observed seven pointings centered on the ICRS coordinates listed below:\n\n|RA [deg]|Dec [deg]|\n| - | - |\n|144.130530|10.436230|\n|144.126501|11.595492|\n|145.151367|9.856599|\n|145.151367|11.015861|\n|145.151367|12.175123|\n|146.176234|11.595492|\n|146.180717|12.754753|\n\nThese seven pointings cover the ~50% localization region of the S250328ae event.\n\nWe observed targets selected from transient candidates of GCN 39934 and 39992 (including candidates before and after vetting), X-ray sources from GCN 39972, and potential host galaxies from GLADE+ (Dálya et al. 2022) and PS1-STRM (Beck et al. 2021) catalogs in our pointings. A total of ~3900 targets were observed with an on-source exposure time of 1800 seconds in six pointings and 900 seconds in one pointing (shortened due to bad weather conditions).\n\nWe reduced the data on-site using the quick reduction system based on the PFS Data Reduction Pipeline, and then carried out classification (fitting galaxy, QSO, star, and supernova templates) and visual inspection. After classification and visual inspection, we obtained confident spectroscopic redshifts of ~70% of our targets. Among these sources, five candidates listed below were identified to be the possible electromagnetic counterpart to the gravitational-wave event S250328ae (within the ~90% three-dimensional localization volume partly covered by our pointings). Because these five candidates were originally selected from the GLADE+ and PS1-STRM catalogs that do not contain information of variability, we encourage follow-up observations to confirm their variability. \n\n|ID_PFS|ATNAME|RA [deg]|Dec [deg]|Type_PFS|Redshift|\n| - | - | - | - | - | - |\n|761|AT2019uib|145.718857|12.412288|QSO|0.130|\n|9238|N/A|145.412644|12.717089|QSO|0.096|\n|13647|N/A|144.989553|10.636089|QSO|0.136|\n|17165|N/A|145.733559|11.593362|QSO|0.120|\n|19826|N/A|145.351893|12.503455|QSO|0.136|\n\nNo counterparts to X-ray sources (GCN 39972) are recovered within their reported error bounds by our observations. We do not identify any transient candidates (GCN 39934 and 39992) we observed within the ~90% three-dimensional localization volume of S250328ae. These transient candidates falling outside the ~90% localization volume are listed below.\n\n|ID_ DESGW|ATNAME|RA [deg]|Dec [deg]|Type_ DESGW|Type_PFS|Redshift|\n| - | - | - | - | - | - | - |\n|2290036|AT2025gek|145.199481|10.828527|SN_LIKE|SN Ic|0.233|\n|2290467|AT2020woa|144.388798|10.255536|SN_LIKE|SN Ib|0.050|\n|2292782|AT2025geo|144.928578|10.349243|SN_LIKE|SN Ia|0.182|\n|2290334|AT2025geq|145.235616|12.469694|SN_LIKE|SN Ia|0.186|\n|2290623|AT2025gen|144.112464|11.641817|AGN_LIKE|SN II|0.204|\n|2291223|N/A|146.389563|13.131801|AGN_LIKE|QSO|0.540|\n|2293190|AT2025cvb|144.191297|10.828462|SN_LIKE|SN Ia|0.140|\n|2290143|AT2025ggv|146.033906|11.088812|SN_LIKE|QSO|1.437|\n|2292040|AT2025ges|144.438216|9.885617|AGN_LIKE|SN Ia|0.434|\n|2290059|N/A|144.679961|10.018211|AGN_LIKE|QSO|0.209|\n|2292786|N/A|144.037664|10.810454|AGN_LIKE|SN Ia|0.254|\n|2293517|AT2025geu|145.956024|12.381673|AGN_LIKE|QSO|0.507|\n|2295862|N/A|145.361115|12.521385|AGN_LIKE|QSO|0.969|\n|2290563|N/A|145.149074|11.756403|AGN_LIKE|QSO|0.255|\n|2289995|AT2025ggx|144.57373|10.274445|SN_LIKE|SN II|0.358|\n\nWe are grateful to the staffs at NAOJ and Subaru Telescope for their contributions to the deployments of PFS hardware and software, and the preparations of PFS system integration, engineering observations, and various other engineering works. Our thanks should also be propagated to the administrative staffs at Kavli IPMU, NAOJ, Subaru Telescope, and all the PFS institutes for kind supports in such aspects as finances, contracts, asset managements, and so on. \n\nThis research is based on data collected at the Subaru Telescope, which is operated by the National Astronomical Observatory of Japan. We are honored and grateful for the opportunity of observing the Universe from Maunakea, which has the cultural, historical, and natural significance in Hawaii.\n\nThe DECam Search & Discovery Program for Optical Signatures of Gravitational Wave Events (DESGW) is carried out by the Dark Energy Survey (DES) collaboration in partnership with wide-ranging groups in the community. DESGW uses data obtained with the Dark Energy Camera (DECam), which was constructed by the DES collaboration with support from the Department of Energy and member institutions, and utilizes data as distributed by the Science Data Archive at NOIRLAB. NOIRLAB is operated by the Association of Universities for Research in Astronomy (AURA) under a cooperative agreement with the National Science Foundation. We thank the Cerro Tololo observatory staff for their support in acquiring these observations.\n\n\n\n",
"published": "2025-05-10T16:09:53.113122Z",
"message_parser": "GCN Circular Parser v2",
"retracted": false,
"created": "2025-05-10T16:09:53.113140Z",
"modified": "2025-05-10T16:09:53.116408Z",
"targets": []
},
{
"id": 186526,
"topic": "gcn.circulars",
"uuid": "ccbf547c-b4ca-488c-8f03-a560430253ce",
"title": "LIGO/Virgo/KAGRA S250328ae: Subaru/PFS Spectroscopic Follow up and Candidates",
"submitter": "Haibin Zhang at National Astronomical Observatory of Japan (NAOJ) <haibin.zhang@nao.ac.jp>",
"authors": "Haibin Zhang at National Astronomical Observatory of Japan (NAOJ) <haibin.zhang@nao.ac.jp>",
"data": {
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/40221"
},
"format": "text/markdown",
"$schema": "https://gcn.nasa.gov/schema/v4.2.0/gcn/circulars.schema.json",
"eventId": "LIGO/Virgo/KAGRA S250328ae",
"subject": "LIGO/Virgo/KAGRA S250328ae: Subaru/PFS Spectroscopic Follow up and Candidates",
"createdOn": 1745471531232,
"submitter": "Haibin Zhang at National Astronomical Observatory of Japan (NAOJ) <haibin.zhang@nao.ac.jp>",
"circularId": 40221,
"submittedHow": "web"
},
"message_text": "Haibin Zhang, Mitsuru Kokubo, Nozomu Tominaga, Yousuke Utsumi, Michitoshi Yoshida (NAOJ), Tomoki Morokuma (Chiba Tech), Akira Arai, Wanqui He, Yuki Moritani, Masato Onodera, Vera Maria Passegger, Ichi Tanaka, Kiyoto Yabe (NAOJ), Sean MacBride, Isaac McMahon, Marcelle Soares-Santos (UZH), Ken Herner (Fermilab), Simran Kaur (University of Michigan/UZH), Lillian Joseph (Benedictine U.), and Tom Diehl (FNAL) report on behalf of the Japanese Collaboration for Gravitational-Wave Electro-Magnetic Follow-up (J-GEM), Subaru Telescope, and Dark Energy Survey Gravitational Wave (DESGW) Team:\n\nBetween 05:11 and 10:20 UTC on April 3, 2025, we carried out spectroscopic observations with the Subaru/Prime Focus Spectrograph (PFS) following the LVK alert issued for the gravitational-wave event S250328ae (GCN 39898). The Subaru/PFS is a fiber spectrograph capable of observing ~2400 targets simultaneously within a ~1.25 square degree field of view, and covers a wavelength range of 380 nm to 1260 nm with a resolving power of ~2500-5500 (Sugai et al. 2015; Tamura et al. 2024). We observed seven pointings centered on the ICRS coordinates listed below:\n\n|RA [deg]|Dec [deg]|\n| - | - |\n|144.130530|10.436230|\n|144.126501|11.595492|\n|145.151367|9.856599|\n|145.151367|11.015861|\n|145.151367|12.175123|\n|146.176234|11.595492|\n|146.180717|12.754753|\n\nThese seven pointings cover the ~50% localization region of the S250328ae event.\n\nWe observed targets selected from transient candidates of GCN 39934 and 39992 (including candidates before and after vetting), X-ray sources from GCN 39972, and potential host galaxies from GLADE+ (Dálya et al. 2022) and PS1-STRM (Beck et al. 2021) catalogs in our pointings. A total of ~3900 targets were observed with an on-source exposure time of 1800 seconds in six pointings and 900 seconds in one pointing (shortened due to bad weather conditions).\n\nWe reduced the data on-site using the quick reduction system based on the PFS Data Reduction Pipeline, and then carried out classification (fitting galaxy, QSO, star, and supernova templates) and visual inspection. After classification and visual inspection, we obtained confident spectroscopic redshifts of ~70% of our targets. Among these sources, five candidates listed below were identified to be the possible electromagnetic counterpart to the gravitational-wave event S250328ae (within the ~90% three-dimensional localization volume partly covered by our pointings). Because these five candidates were originally selected from the GLADE+ and PS1-STRM catalogs that do not contain information of variability, we encourage follow-up observations to confirm their variability. \n\n|ID_PFS|ATNAME|RA [deg]|Dec [deg]|Type_PFS|Redshift|\n| - | - | - | - | - | - |\n|761|AT2019uib|145.718857|12.412288|QSO|0.130|\n|9238|N/A|145.412644|12.717089|QSO|0.096|\n|13647|N/A|144.989553|10.636089|QSO|0.136|\n|17165|N/A|145.733559|11.593362|QSO|0.120|\n|19826|N/A|145.351893|12.503455|QSO|0.136|\n\nNo counterparts to X-ray sources (GCN 39972) are recovered within their reported error bounds by our observations. We do not identify any transient candidates (GCN 39934 and 39992) we observed within the ~90% three-dimensional localization volume of S250328ae. These transient candidates falling outside the ~90% localization volume are listed below.\n\n|ID_ DESGW|ATNAME|RA [deg]|Dec [deg]|Type_ DESGW|Type_PFS|Redshift|\n| - | - | - | - | - | - | - |\n|2290036|AT2025gek|145.199481|10.828527|SN_LIKE|SN Ic|0.233|\n|2290467|AT2020woa|144.388798|10.255536|SN_LIKE|SN Ib|0.050|\n|2292782|AT2025geo|144.928578|10.349243|SN_LIKE|SN Ia|0.182|\n|2290334|AT2025geq|145.235616|12.469694|SN_LIKE|SN Ia|0.186|\n|2290623|AT2025gen|144.112464|11.641817|AGN_LIKE|SN II|0.204|\n|2291223|N/A|146.389563|13.131801|AGN_LIKE|QSO|0.540|\n|2293190|AT2025cvb|144.191297|10.828462|SN_LIKE|SN Ia|0.140|\n|2290143|AT2025ggv|146.033906|11.088812|SN_LIKE|QSO|1.437|\n|2292040|AT2025ges|144.438216|9.885617|AGN_LIKE|SN Ia|0.434|\n|2290059|N/A|144.679961|10.018211|AGN_LIKE|QSO|0.209|\n|2292786|N/A|144.037664|10.810454|AGN_LIKE|SN Ia|0.254|\n|2293517|AT2025geu|145.956024|12.381673|AGN_LIKE|QSO|0.507|\n|2295862|N/A|145.361115|12.521385|AGN_LIKE|QSO|0.969|\n|2290563|N/A|145.149074|11.756403|AGN_LIKE|QSO|0.255|\n|2289995|AT2025ggx|144.57373|10.274445|SN_LIKE|SN II|0.358|\n\nWe are grateful to the staffs at NAOJ and Subaru Telescope for their contributions to the deployments of PFS hardware and software, and the preparations of PFS system integration, engineering observations, and various other engineering works. Our thanks should also be propagated to the administrative staffs at Kavli IPMU, NAOJ, Subaru Telescope, and all the PFS institutes for kind supports in such aspects as finances, contracts, asset managements, and so on. \n\nThis research is based on data collected at the Subaru Telescope, which is operated by the National Astronomical Observatory of Japan. We are honored and grateful for the opportunity of observing the Universe from Maunakea, which has the cultural, historical, and natural significance in Hawaii.\n\nThe DECam Search & Discovery Program for Optical Signatures of Gravitational Wave Events (DESGW) is carried out by the Dark Energy Survey (DES) collaboration in partnership with wide-ranging groups in the community. DESGW uses data obtained with the Dark Energy Camera (DECam), which was constructed by the DES collaboration with support from the Department of Energy and member institutions, and utilizes data as distributed by the Science Data Archive at NOIRLAB. NOIRLAB is operated by the Association of Universities for Research in Astronomy (AURA) under a cooperative agreement with the National Science Foundation. We thank the Cerro Tololo observatory staff for their support in acquiring these observations.\n\n\n\n",
"published": "2025-05-10T16:09:51.936132Z",
"message_parser": "GCN Circular Parser v2",
"retracted": false,
"created": "2025-05-10T16:09:51.936150Z",
"modified": "2025-05-10T16:09:51.939372Z",
"targets": []
},
{
"id": 186376,
"topic": "gcn.circulars",
"uuid": "53d1c15c-7178-4cb2-b0a9-068308869ec4",
"title": "LIGO/Virgo/KAGRA S250328ae: DECam DESGW Candidates (Epoch 2)",
"submitter": "Isaac McMahon at University of Zürich <isaac.mcmahon@ligo.org>",
"authors": "Isaac McMahon at University of Zürich <isaac.mcmahon@ligo.org>",
"data": {
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/39992"
},
"format": "text/markdown",
"$schema": "https://gcn.nasa.gov/schema/v4.2.0/gcn/circulars.schema.json",
"bibcode": "2025GCN.39992....1M",
"eventId": "LIGO/Virgo/KAGRA S250328ae",
"subject": "LIGO/Virgo/KAGRA S250328ae: DECam DESGW Candidates (Epoch 2)",
"version": 2,
"editedBy": "Vidushi Sharma at NASA GSFC/UMBC <vidushi.sharma@nasa.gov> on behalf of Isaac McMahon at University of Zürich <isaac.mcmahon@ligo.org>",
"editedOn": 1743520033322,
"createdOn": 1743471309571,
"submitter": "Isaac McMahon at University of Zürich <isaac.mcmahon@ligo.org>",
"circularId": 39992,
"submittedHow": "web"
},
"message_text": "S. MacBride (UZH), I. McMahon (UZH), M. Soares-Santos (UZH), K. Herner (Fermilab), S. Kaur (University of Michigan/UZH), reporting on behalf of the Dark Energy Survey Gravitational Wave (DESGW) Team:\n\nAt 01:46 UTC, March 30th, the Dark Energy Camera (DECam) began the second epoch of observations in response to the LVK alert issued for the candidate gravitational-wave event S250328ae (GCN 39898). We observed eight fields centered on the following ICRS coordinates:\n\n| RA | DEC |\n| ---------- | ---------- |\n| 145.286221 | 10.615360 |\n| 145.996500 | 12.108130 |\n| 143.786221 | 10.715360 |\n| 144.496500 | 12.208130 |\n| 144.069167 | 9.115670 |\n| 143.344621 | 7.609550 |\n| 145.900667 | 13.593470 |\n| 142.620092 | 6.103430 |\n\nThese pointings are identical to the first epoch observations from March 29th, 2025 (GCN 39934).\n\nAll fields were observed in DECam r, i, and z filters with 90-second exposures. The limiting magnitude achieved is ~22.8 in r-band, ~22.5 in i-band, and ~21.9 in z-band. \n\nWe process the images with our difference imaging pipeline (Herner et al. 2020) using DES and public DECam images as templates. We employ the autoscan machine learning code (Goldstein et al 2015) to reject subtraction artifacts, requiring an autoscan score of at least 0.7 on both nights of observations. We also match our candidates against the ALLWISE, Milliquas, Quaia, and LQAC-6 AGN catalogs (Secrest et al 2015, Flesch 2023, Storey-Fisher et al 2024, Souchay et al 2024) within the LVK localization volume.\n\nAfter candidate selection, we report 25 high confidence candidates listed below. After vetting and identification, 15 candidates are classified as nuclear candidates (likely active galactic nuclei) and 10 candidates as possible supernovae. No candidates from the second epoch of observations match known AGNs within 1 arcsecond. 12 of the 20 candidates in the first epoch are listed here, while the candidates which do not appear did not have a confident detection in the second epoch. We also do not recover any of the X-ray source candidates reported by Swift XRT (GCN 39972) within their reported error bounds.\n\n| TYPE | ID | ATNAME | RA | DEC | MAG_R | MAG_R_ERR | MAG_I | MAG_I_ERR | MAG_Z | MAG_Z_ERR |\n| -------- | ------- | --------- | ---------- | ---------- | ----- | ---- | ----- | ---- | ----- | ---- |\n| SN_LIKE | 2290036 | AT2025gek | 145.199481 | 10.828527 | 20.77 | 0.04 | 20.62 | 0.03 | 20.69 | 0.1 |\n| SN_LIKE | 2290467 | AT2020woa | 144.388798 | 10.255536 | 19.87 | 0.02 | N/A | N/A | 20.1 | 0.04 |\n| SN_LIKE | 2292782 | AT2025geo | 144.928578 | 10.349243 | 20.92 | 0.04 | 21.07 | 0.04 | N/A | N/A |\n| SN_LIKE | 2290001 | AT2025avp | 144.806008 | 10.632223 | 20.36 | 0.02 | 20.19 | 0.02 | 20.22 | 0.06 |\n| SN_LIKE | 2290334 | AT2025geq | 145.235616 | 12.469694 | 20.22 | 0.02 | 20.57 | 0.03 | 21.11 | 0.11 |\n| AGN_LIKE | 2290623 | AT2025gen | 144.112464 | 11.641817 | 21.4 | 0.04 | 21.3 | 0.08 | 21.37 | 0.12 |\n| AGN_LIKE | 2291223 | N/A | 146.389563 | 13.131801 | 20.56 | 0.02 | 20.64 | 0.04 | 20.52 | 0.05 |\n| SN_LIKE | 2291473 | AT2025gem | 144.706509 | 11.560317 | 20.92 | 0.03 | N/A | N/A | 21.22 | 0.1 |\n| SN_LIKE | 2293190 | AT2025cvb | 144.191297 | 10.828462 | 20.86 | 0.03 | 20.87 | 0.03 | N/A | N/A |\n| SN_LIKE | 2290143 | AT2025ggv | 146.033906 | 11.088812 | 21.26 | 0.05 | 21.46 | 0.07 | 21.47 | 0.13 |\n| AGN_LIKE | 2292003 | N/A | 144.007084 | 9.336975 | 21.18 | 0.03 | 21.16 | 0.05 | 21.6 | 0.11 |\n| SN_LIKE | 2292854 | AT2025ggw | 142.67125 | 6.637349 | N/A | N/A | 20.75 | 0.04 | 20.72 | 0.06 |\n| AGN_LIKE | 2290453 | N/A | 146.299999 | 13.629839 | 21.7 | 0.06 | 21.89 | 0.11 | 22.14 | 0.19 |\n| AGN_LIKE | 2292040 | AT2025ges | 144.438216 | 9.885617 | 21.72 | 0.07 | 21.75 | 0.11 | 21.93 | 0.17 |\n| AGN_LIKE | 2290059 | N/A | 144.679961 | 10.018211 | N/A | N/A | 20.26 | 0.03 | 21.11 | 0.12 |\n| AGN_LIKE | 2290970 | AT2025ger | 142.543835 | 6.090899 | 21.71 | 0.05 | 21.43 | 0.06 | 21.28 | 0.09 |\n| AGN_LIKE | 2294074 | AT2025gew | 144.291829 | 8.349302 | 22.23 | 0.1 | 21.85 | 0.11 | 22.28 | 0.15 |\n| AGN_LIKE | 2292786 | N/A | 144.037664 | 10.810454 | 22.27 | 0.08 | 22.12 | 0.11 | 22.89 | 0.25 |\n| AGN_LIKE | 2293517 | AT2025geu | 145.956024 | 12.381673 | 21.73 | 0.08 | 21.65 | 0.07 | 21.51 | 0.14 |\n| AGN_LIKE | 2295862 | N/A | 145.361115 | 12.521385 | 22.44 | 0.11 | 23.33 | 0.36 | 23.47 | 0.46 |\n| AGN_LIKE | 2290563 | N/A | 145.149074 | 11.756403 | 23.41 | 0.33 | 22.11 | 0.11 | 22.3 | 0.24 |\n| AGN_LIKE | 2290298 | N/A | 144.167668 | 10.985136 | 21.59 | 0.05 | 21.99 | 0.12 | 21.1 | 0.1 |\n| SN_LIKE | 2289995 | AT2025ggx | 144.57373 | 10.274445 | 22.62 | 0.19 | 22.31 | 0.14 | 21.7 | 0.22 |\n| AGN_LIKE | 2291169 | N/A | 145.423743 | 11.834742 | 22.57 | 0.14 | 23.44 | 0.34 | 22.8 | 0.46 |\n| AGN_LIKE | 2293519 | N/A | 143.751725 | 9.714206 | 22.75 | 0.15 | 22.23 | 0.14 | 21.63 | 0.12 |\n\nWe encourage followup of the 25 candidates identified herein. \n\nThe DECam Search & Discovery Program for Optical Signatures of Gravitational Wave Events (DESGW) is carried out by the Dark Energy Survey (DES) collaboration in partnership with wide-ranging groups in the community. DESGW uses data obtained with the Dark Energy Camera (DECam), which was constructed by the DES collaboration with support from the Department of Energy and member institutions, and utilizes data as distributed by the Science Data Archive at NOIRLAB. NOIRLAB is operated by the Association of Universities for Research in Astronomy (AURA) under a cooperative agreement with the National Science Foundation. We thank the Cerro Tololo observatory staff for their support in acquiring these observations.",
"published": "2025-05-10T16:09:50.544858Z",
"message_parser": "GCN Circular Parser v2",
"retracted": false,
"created": "2025-05-10T16:09:50.544876Z",
"modified": "2025-05-10T16:09:50.548264Z",
"targets": []
},
{
"id": 186374,
"topic": "gcn.circulars",
"uuid": "b57b5bdb-b38e-423f-985e-b9e6eb457bfc",
"title": "LIGO/Virgo/KAGRA S250328ae: Swift XRT observations, 34 possible X-ray sources",
"submitter": "Phil Evans at U of Leicester <pae9@star.le.ac.uk>",
"authors": "Phil Evans at U of Leicester <pae9@star.le.ac.uk>",
"data": {
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/39972"
},
"$schema": "https://gcn.nasa.gov/schema/v4.2.0/gcn/circulars.schema.json",
"bibcode": "2025GCN.39972....1E",
"eventId": "LIGO/Virgo/KAGRA S250328ae",
"subject": "LIGO/Virgo/KAGRA S250328ae: Swift XRT observations, 34 possible X-ray sources",
"createdOn": 1743429847187,
"submitter": "Phil Evans at U of Leicester <pae9@star.le.ac.uk>",
"circularId": 39972,
"submittedHow": "email"
},
"message_text": "P.A. Evans (U. Leicester), J.A. Kennea (PSU), A. Tohuvavohu (U. Toronto), S.B. Cenko (NASA/GSFC),\nR.A.J. Eyles-Ferris (U. Leicester), K.L. Page (U. Leicester), A.P. Beardmore (U. Leicester), M.G.\nBernardini (INAF-OAB), A.A. Breeveld (UCL-MSSL), S. Campana (INAF-OAB), J.J. Delaunay (PSU), M. De\nPasquale (University of Messina), S. Dichiara (PSU), P. D’Avanzo (INAF-OAB), A. D’Aì\n(INAF-IASFPA) , V. D’Elia (ASI-SSDC & INAF-OAR), C. Gronwall (PSU), D. Hartmann (Clemson\nUniversity), N. Klingler (NASA-GSFC / UMBC / CRESST II), N.P.M. Kuin (UCL-MSSL), S. Laha\n(NASA/GSFC), S.R. Oates (U. Birmingham), J.P. Osborne (U. Leicester), P. O’Brien (U. Leicester),\nM.J. Page (UCL-MSSL), G. Raman (PSU) S. Ronchini (PSU), T. Sbarrato (INAF-OAB), B. Sbarufatti\n(INAF-OAB), M.H. Siegel (PSU), G. Tagliaferri (INAF-OAB), E. Troja (U Tor Vergata, INAF) report on\nbehalf of the Swift team:\n\nSwift has carried out 97 observations of the LVK error region for the GW trigger S250328ae\nconvolved with the 2MPZ catalogue (Bilicki et al. 2014, ApJS, 210, 9), using the 'BAYESTAR' GW\nlocalisation map. As this is a 3D skymap, galaxy distances were taken into account in selecting\nwhich ones to observe. The observations currently span from 3.0 ks to 38 ks after the LVK trigger,\nand the XRT has covered 5.3 deg^2 on the sky (corrected for overlaps). This covers 68% of the\nprobability in the 'ligo-skymap-from-samples' skymap, and 72% after convolving with the 2MPZ galaxy\ncatalogue, as described by Evans et al. (2016, MNRAS, 462, 1591).\n\nWe have detected 34 X-ray sources. Each source is assigned a rank of 1-4 which describes how likely\nit is to be related to the GW trigger, with 1 being the most likely and 4 being the least likely.\nThe ranks are described at https://www.swift.ac.uk/ranks.php.\n\nWe have found:\n\n * 0 sources of rank 1\n * 0 sources of rank 2\n * 34 sources of rank 3\n * 0 sources of rank 4\n\n\nRANK 3 sources\n==============\n\nThese are uncatalogued X-ray sources, however they are not brighter than previous upper limits, so\ndo not stand out as likely counterparts to the GW trigger.\n\n| Source ID\t | RA\t\t | Dec \t | Err90 | Detection Flag\t|\n| S250328ae_X1 | 09h 37m 34.26s | +11d 00' 47.1\" |\t8.3\" |\t\t POOR |\n| S250328ae_X2 | 09h 37m 40.59s | +11d 15' 09.3\" |\t5.4\" |\t REASONABLE |\n| S250328ae_X3 | 09h 38m 01.16s | +11d 14' 02.6\" |\t6.5\" |\t\t POOR |\n| S250328ae_X5 | 09h 38m 05.54s | +11d 24' 32.5\" |\t6.5\" |\t\t POOR |\n| S250328ae_X6 | 09h 37m 57.28s | +11d 18' 05.4\" |\t6.5\" |\t\t POOR |\n| S250328ae_X8 | 09h 38m 05.52s | +11d 19' 00.3\" |\t9.1\" |\t\t POOR |\n| S250328ae_X9 | 09h 38m 34.55s | +11d 14' 28.5\" |\t6.4\" |\t\t POOR |\n| S250328ae_X10 | 09h 38m 37.34s | +11d 16' 12.5\" |\t9.9\" |\t\t POOR |\n| S250328ae_X11 | 09h 38m 13.89s | +11d 16' 52.4\" |\t9.5\" |\t\t POOR |\n| S250328ae_X12 | 09h 37m 35.17s | +10d 47' 58.5\" |\t6.6\" |\t\t POOR |\n| S250328ae_X13 | 09h 39m 29.53s | +11d 47' 43.2\" |\t6.0\" |\t\t POOR |\n| S250328ae_X14 | 09h 39m 57.31s | +12d 06' 58.4\" |\t8.7\" |\t\t POOR |\n| S250328ae_X15 | 09h 39m 31.81s | +12d 06' 34.6\" |\t7.9\" |\t\t POOR |\n| S250328ae_X16 | 09h 40m 10.28s | +11d 53' 17.1\" |\t6.7\" |\t\t POOR |\n| S250328ae_X17 | 09h 39m 48.52s | +11d 55' 48.6\" |\t7.4\" |\t\t POOR |\n| S250328ae_X18 | 09h 39m 45.99s | +11d 54' 42.0\" |\t7.5\" |\t\t POOR |\n| S250328ae_X19 | 09h 39m 39.79s | +11d 54' 32.3\" |\t6.6\" |\t\t POOR |\n| S250328ae_X20 | 09h 39m 23.21s | +11d 57' 42.7\" |\t6.6\" |\t\t POOR |\n| S250328ae_X21 | 09h 39m 41.64s | +11d 53' 24.9\" | 13.1\" |\t\t POOR |\n| S250328ae_X22 | 09h 39m 45.64s | +11d 51' 32.9\" |\t9.1\" |\t\t POOR |\n| S250328ae_X23 | 09h 39m 28.69s | +11d 59' 35.2\" |\t8.2\" |\t\t POOR |\n| S250328ae_X24 | 09h 39m 51.34s | +11d 52' 24.6\" |\t6.2\" |\t\t POOR |\n| S250328ae_X25 | 09h 40m 08.46s | +11d 55' 52.5\" |\t8.9\" |\t\t POOR |\n| S250328ae_X26 | 09h 39m 51.33s | +11d 55' 00.9\" |\t6.6\" |\t\t POOR |\n| S250328ae_X27 | 09h 39m 34.55s | +12d 01' 50.9\" |\t7.2\" |\t\t POOR |\n| S250328ae_X28 | 09h 40m 17.23s | +11d 54' 47.3\" |\t9.7\" |\t\t POOR |\n| S250328ae_X29 | 09h 39m 31.19s | +11d 54' 35.1\" |\t8.4\" |\t\t POOR |\n| S250328ae_X30 | 09h 39m 39.91s | +12d 04' 29.3\" | 15.4\" |\t\t POOR |\n| S250328ae_X31 | 09h 38m 40.15s | +11d 14' 00.3\" |\t5.7\" |\t\t POOR |\n| S250328ae_X32 | 09h 38m 17.68s | +11d 19' 25.6\" | 13.5\" |\t\t POOR |\n| S250328ae_X33 | 09h 39m 18.34s | +11d 59' 40.6\" |\t8.9\" |\t\t POOR |\n| S250328ae_X34 | 09h 39m 52.80s | +11d 54' 16.5\" |\t8.0\" |\t\t POOR |\n| S250328ae_X35 | 09h 39m 34.91s | +12d 05' 56.6\" |\t9.0\" |\t\t POOR |\n| S250328ae_X36 | 09h 39m 29.20s | +12d 02' 51.1\" | 10.7\" |\t\t POOR |\n\nFor all flux conversions and comparisons with catalogues and upper limits from other missions, we\nassumed a power-law spectrum with NH=3x10^20 cm^-2, and photon index (Gamma)=1.7, unless otherwise\nstated.\n\nThe results of the XRT automated analysis, including details of the sources listed above, are\nonline at https://www.swift.ac.uk/LVC/S250328ae\n\nThis circular is an official product of the Swift XRT team.\n\n\n",
"published": "2025-05-10T16:09:50.520811Z",
"message_parser": "GCN Circular Parser v2",
"retracted": false,
"created": "2025-05-10T16:09:50.520828Z",
"modified": "2025-05-10T16:09:50.524045Z",
"targets": []
},
{
"id": 186362,
"topic": "gcn.circulars",
"uuid": "b2d8935c-0d66-4ddd-abd3-250451a32995",
"title": "LIGO/Virgo/KAGRA S250328ae: NED Galaxies in the 4-Update Localization Volume",
"submitter": "David Cook at Caltech/IPAC-NED <dcook@ipac.caltech.edu>",
"authors": "David Cook at Caltech/IPAC-NED <dcook@ipac.caltech.edu>",
"data": {
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/39908"
},
"format": "text/markdown",
"$schema": "https://gcn.nasa.gov/schema/v4.2.0/gcn/circulars.schema.json",
"bibcode": "2025GCN.39908....1C",
"eventId": "LIGO/Virgo/KAGRA S250328ae",
"subject": "LIGO/Virgo/KAGRA S250328ae: NED Galaxies in the 4-Update Localization Volume",
"createdOn": 1743175983914,
"submitter": "David Cook at Caltech/IPAC-NED <dcook@ipac.caltech.edu>",
"circularId": 39908,
"submittedHow": "web"
},
"message_text": "David O. Cook (Caltech/IPAC), Rick Ebert (Caltech/IPAC), George Helou (Caltech/IPAC), Joseph M. Mazzarella (Caltech/IPAC), Marion Schmitz (Caltech/IPAC), and Leo Singer (NASA/GSFC)\n\nOn behalf of the NASA/IPAC Extragalactic Database (NED) Team.\n\nWe spatially cross-matched the LVK S250328ae-4-Update sky localization with the NED Local Volume Sample (NED-LVS; Cook et al. 2023), which is a subset of NED with a redshift or redshift-independent distance less than 1000 Mpc. We find 839 galaxies within the 90% containment volume, and we list here the top 20 galaxies sorted by the joint probability of the 3D localization and the WISE W1 luminosity (an observable proxy for stellar mass). For the full or top 20 list of galaxies in the 90% volume go either to the NED Gravitational Wave Followup service at https://ned.ipac.caltech.edu/uri/NED::GWF/ or click on the following links:\n\nFull List Download: https://ned.ipac.caltech.edu/uri/NED::GWFglist/fits/S250328ae/4 \nTop 20 List Download: https://ned.ipac.caltech.edu/uri/NED::GWFglist/fits/S250328ae/4/20\n\nThe NED-GWF service provides downloadable galaxy lists and visualizations for candidate host galaxies. For each GW alert, these products are automatically generated and made available within minutes to expedite efficient electromagnetic follow-up observations. The NED top 20 list is sorted by the joint probability of the 3D localization and the WISE W1 luminosity, but users can sort on additional pre-computed prioritization metrics (star formation rate, P_3D * P_SFR; and specific star formation rate, P_3D * P_sSFR; etc.) which are available via downloading the entire galaxy list inside the event's probability volume.\n\n| objname| ra| dec|objtype| DistMpc|DistMpc_unc| m_NUV| m_NUV_unc| m_Ks| m_Ks_unc| m_W1| m_W1_unc| P_3D|P_3D_LumW1|\n|-------------------------|--------------|--------------|-------|-----------|-----------|------------|------------|------------|------------|------------|------------|--------|----------|\n|WISEA J094227.03+110047.4| 145.61266| 11.01318| G| 612.35| null| null| null| 12.661| 0.096| 10.577| 0.006|2.63e-06| 5.47e-08|\n|WISEA J093435.61+082700.3| 143.64838| 8.45010| G| 507.10| 0.11| null| null| 13.186| 0.203| 10.854| 0.006|3.85e-06| 4.28e-08|\n|WISEA J093458.83+094902.6| 143.74516| 9.81741| G| 564.56| 0.09| null| null| 14.250| 0.157| 10.944| 0.007|2.12e-06| 2.69e-08|\n|WISEA J093555.60+093752.8| 143.98169| 9.63134| G| 589.67| 0.08| null| null| 13.465| 0.202| 11.501| 0.007|2.87e-06| 2.37e-08|\n|WISEA J093938.05+110947.9| 144.90857| 11.16332| G| 482.07| 0.08| null| null| 13.597| 0.141| 12.972| 0.014|1.58e-05| 2.25e-08|\n|WISEA J094028.13+111733.4| 145.11722| 11.29263| G| 556.24| 0.11| null| null| 13.110| 0.111| 12.941| 0.015|9.93e-06| 1.94e-08|\n|WISEA J094035.77+103104.6| 145.14905| 10.51795| G| 495.66| 0.07| null| null| 13.045| 0.080| 12.298| 0.012|6.77e-06| 1.90e-08|\n|WISEA J093657.39+085125.0| 144.23916| 8.85696| G| 557.28| 0.06| null| null| null| null| 11.769| 0.007|3.22e-06| 1.86e-08|\n|WISEA J094109.87+105038.6| 145.29116| 10.84407| G| 439.67| 0.07| null| null| 12.109| 0.080| 12.120| 0.012|6.55e-06| 1.70e-08|\n|WISEA J094121.23+112617.1| 145.33849| 11.43811| G| 564.36| 0.09| null| null| 13.311| 0.123| 13.095| 0.017|9.76e-06| 1.70e-08|\n|WISEA J094025.05+111347.9| 145.10441| 11.23000| G| 557.91| 0.09| null| null| 13.243| 0.108| 13.078| 0.020|9.62e-06| 1.66e-08|\n|WISEA J093619.16+091944.6| 144.07983| 9.32906| G| 588.58| 0.11| null| null| 13.919| 0.167| 12.015| 0.007|3.16e-06| 1.62e-08|\n|WISEA J093619.13+091936.4| 144.07971| 9.32680| G| 591.85| 0.08| null| null| 12.365| 0.106| 12.060| 0.010|3.00e-06| 1.49e-08|\n|WISEA J093747.49+101024.7| 144.44789| 10.17354| G| 432.26| 0.05| null| null| 12.881| 0.108| 12.438| 0.013|7.81e-06| 1.46e-08|\n|WISEA J093417.20+081006.5| 143.57167| 8.16848| G| 347.36| 0.08| 21.156| 0.071| 13.681| 0.191| 10.002| 0.006|1.22e-06| 1.39e-08|\n|WISEA J094125.76+110548.3| 145.35737| 11.09678| G| 557.02| 0.07| null| null| 13.696| 0.126| 13.350| 0.021|9.58e-06| 1.28e-08|\n|WISEA J094051.38+102028.4| 145.21409| 10.34125| G| 444.19| 0.03| null| null| 15.275| 0.145| 12.091| 0.007|4.61e-06| 1.25e-08|\n|WISEA J094106.66+105024.2| 145.27777| 10.84008| G| 487.71| null| null| null| 14.219| 0.109| 13.198| 0.021|1.00e-05| 1.18e-08|\n|WISEA J093537.73+091115.6| 143.90721| 9.18768| G| 552.71| 0.11| null| null| 13.648| 0.222| 12.528| 0.013|4.10e-06| 1.16e-08|\n|WISEA J093620.06+092335.0| 144.08362| 9.39307| G| 582.84| 0.07| 20.401| 0.231| 13.508| 0.189| 12.534| 0.014|3.60e-06| 1.12e-08|\n\nTable 1: Top 20 galaxies in NED-LVS that fall in the 90% probability volume for S250328ae sorted by the joint probability of 3D position and WISE W1 luminosity (P_3D * P_LumW1). Galaxy is the NED preferred name. RA and Dec are the Equatorial coordinates in degrees (J2000). Objtype is the object type of the galaxy candidate. Distance is the distance to the galaxy in Mpc. m_NUV and mErr_NUV are the apparent magnitude and error from GALEX. m_Ks and mErr_Ks are the apparent magnitude and error from 2MASS. m_W1 and mErr_W1 are the apparent magnitude and error from AllWISE. P_3D is the probability that the galaxy is in the volume given the distance of GW event. P_3D_LumW1 is the joint probability within the volume weighted by the WISE1 luminosity of the galaxy (P_3D * P_LumW1). \n",
"published": "2025-05-10T16:09:50.400032Z",
"message_parser": "GCN Circular Parser v2",
"retracted": false,
"created": "2025-05-10T16:09:50.400050Z",
"modified": "2025-05-10T16:09:50.403331Z",
"targets": []
},
{
"id": 186336,
"topic": "gcn.circulars",
"uuid": "ad1657ac-01db-44c4-a63d-e439564a0401",
"title": "LIGO/Virgo/KAGRA S250328ae: DECam DESGW Candidates (Epoch 1)",
"submitter": "Isaac McMahon at University of Zürich <isaac.mcmahon@ligo.org>",
"authors": "Isaac McMahon at University of Zürich <isaac.mcmahon@ligo.org>",
"data": {
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/39934"
},
"format": "text/plain",
"$schema": "https://gcn.nasa.gov/schema/v4.2.0/gcn/circulars.schema.json",
"bibcode": "2025GCN.39934....1M",
"eventId": "LIGO/Virgo/KAGRA S250328ae",
"subject": "LIGO/Virgo/KAGRA S250328ae: DECam DESGW Candidates (Epoch 1)",
"version": 2,
"editedBy": "Vidushi Sharma at NASA GSFC/UMBC <vidushi.sharma@nasa.gov> on behalf of Isaac McMahon at University of Zürich <isaac.mcmahon@ligo.org>",
"editedOn": 1743520052288,
"createdOn": 1743287424832,
"submitter": "Isaac McMahon at University of Zürich <isaac.mcmahon@ligo.org>",
"circularId": 39934,
"submittedHow": "web"
},
"message_text": "S. MacBride (UZH), I. McMahon (UZH), S. Kaur (University of Michigan/UZH), M. Soares-Santos (UZH), reporting on behalf of the Dark Energy Survey Gravitational Wave (DESGW) Team:\n\nAt 01:43 UTC, March 29th, the Dark Energy Camera (DECam) began the first epoch of observations in response to the LVK alert issued for the candidate gravitational-wave event S250328ae (GCN 39898). We observed eight fields centered on the following ICRS coordinates:\n(145.286221, 10.615360)\n(145.996500, 12.108130)\n(143.786221, 10.715360)\n(144.496500, 12.208130)\n(144.069167, 9.115670)\n(143.344621, 7.609550)\n(145.900667, 13.593470)\n(142.620092, 6.103430)\nThese pointings cover the 90% localization region of candidate gravitational-wave event S250328ae.\n\nAll fields were observed in DECam r, i, and z filters with 90-second exposures. The limiting magnitude achieved is ~22.7 in r-band, ~22.1 in i-band, and ~21.4 in z-band. \n\nWe process the images with our difference imaging pipeline (Herner et al. 2020) using DES and public DECam images as templates. We employ the autoscan machine learning code (Goldstein et al 2015) to reject subtraction artifacts. Candidates were selected by requiring at least two high signal to noise detections. We also require an autoscan score of at least 0.7 on at least one of those detections. We also match our candidates against the ALLWISE, Milliquas, and Quaia AGN catalogs (Secrest et al 2015, Flesch 2023, Storey-Fisher et al 2024) within the LVK localization volume to determine if any correspond to known active galactic nuclei.\n\nAfter candidate selection, we report the 20 high confidence candidates listed below. After vetting and identification, 8 candidates are classified as nuclear candidates (likely active galactic nuclei), 8 candidates as possible supernovae, and 3 other candidates do not fall in either category. 1 additional candidate (2292763) has been identified as a known AGN WISEA J093710.05+082057.2. We have numerous other transient candidates which require further observation to confidently classify. Further observations are ongoing, and we encourage followup of the 20 candidates identified herein. \n\n| TYPE | ID | ATNAME | RA | DEC | MAG_R | MAG_R_ERR | MAG_I | MAG_I_ERR | MAG_Z | MAG_Z_ERR |\n| -------- | ------- | --------- | ---------- | ---------- | ----- | ---- | ----- | ---- | ----- | ---- |\n| SN_LIKE | 2290892 | AT2025gei | 143.636743 | 9.980209 | N/A | N/A | 20.59 | 0.03 | N/A | N/A |\n| OTHER | 2292987 | AT2025gej | 143.183373 | 6.893136 | 21.37 | 0.04 | 21.45 | 0.08 | N/A | N/A |\n| AGN_LIKE | 2290036 | AT2025gek | 145.199481 | 10.828527 | 20.77 | 0.04 | 20.62 | 0.03 | 20.69 | 0.1 |\n| SN_LIKE | 2290467 | AT2020woa | 144.388798 | 10.255536 | 19.87 | 0.02 | N/A | N/A | 20.1 | 0.04 |\n| SN_LIKE | 2290524 | AT2025gel | 144.524917 | 10.199936 | N/A | N/A | N/A | N/A | 20.47 | 0.06 |\n| OTHER | 2290001 | AT2025avp | 144.806008 | 10.632223 | 20.36 | 0.02 | 20.19 | 0.02 | 20.22 | 0.06 |\n| SN_LIKE | 2291473 | AT2025gem | 144.706509 | 11.560317 | 20.92 | 0.03 | N/A | N/A | 21.22 | 0.1 |\n| AGN_LIKE | 2293190 | AT2025cvb | 144.191297 | 10.828462 | 20.86 | 0.03 | 20.87 | 0.03 | N/A | N/A |\n| AGN_LIKE | 2290623 | AT2025gen | 144.112464 | 11.641817 | 21.4 | 0.04 | 21.3 | 0.08 | 21.37 | 0.12 |\n| SN_LIKE | 2292782 | AT2025geo | 144.928578 | 10.349243 | 20.92 | 0.04 | 21.07 | 0.04 | N/A | N/A |\n| SN_LIKE | 2291779 | AT2025gej | 143.182187 | 6.894174 | N/A | N/A | N/A | N/A | 20.76 | 0.06 |\n| OTHER | 2290762 | AT2025gep | 144.259773 | 11.511316 | 21.29 | 0.04 | N/A | N/A | N/A | N/A |\n| SN_LIKE | 2290334 | AT2025geq | 145.235616 | 12.469694 | 20.22 | 0.02 | 20.57 | 0.03 | N/A | N/A |\n| AGN_LIKE | 2290970 | AT2025ger | 142.543835 | 6.090899 | 21.71 | 0.05 | 21.43 | 0.06 | 21.28 | 0.09 |\n| AGN_LIKE | 2292040 | AT2025ges | 144.438216 | 9.885617 | 21.72 | 0.07 | 21.75 | 0.11 | 21.93 | 0.17 |\n| SN_LIKE | 2292645 | AT2025get | 144.053408 | 11.422277 | N/A | N/A | 22.67 | 0.21 | N/A | N/A |\n| AGN_LIKE | 2293517 | AT2025geu | 145.956024 | 12.381673 | 21.73 | 0.08 | 21.65 | 0.07 | N/A | N/A |\n| AGN_LIKE | 2291833 | AT2025gev | 143.241035 | 8.651865 | 22.16 | 0.09 | 21.99 | 0.13 | 22.22 | 0.22 |\n| AGN_LIKE | 2294074 | AT2025gew | 144.291829 | 8.349302 | 22.23 | 0.1 | 21.85 | 0.11 | N/A | N/A |\n| AGN | 2292763 | AT2025gex | 146.071329 | 11.839902 | 21.89 | 0.11 | 21.92 | 0.12 | 21.05 | 0.1 |\n\nThe DECam Search & Discovery Program for Optical Signatures of Gravitational Wave Events (DESGW) is carried out by the Dark Energy Survey (DES) collaboration in partnership with wide-ranging groups in the community. DESGW uses data obtained with the Dark Energy Camera (DECam), which was constructed by the DES collaboration with support from the Department of Energy and member institutions, and utilizes data as distributed by the Science Data Archive at NOIRLAB. NOIRLAB is operated by the Association of Universities for Research in Astronomy (AURA) under a cooperative agreement with the National Science Foundation. We thank the Cerro Tololo observatory staff for their support in acquiring these observations.",
"published": "2025-05-10T16:09:50.159277Z",
"message_parser": "GCN Circular Parser v2",
"retracted": false,
"created": "2025-05-10T16:09:50.159294Z",
"modified": "2025-05-10T16:09:50.162582Z",
"targets": []
}
]
},
{
"event_id": "S250401cw",
"sequences": [
{
"id": 8645,
"sequence_number": 1,
"sequence_type": "PRELIMINARY",
"message": {
"id": 186096,
"topic": "igwn.gwalert",
"uuid": "c5f36192-9ed7-4cb5-855d-cdb13c5f3ea3",
"title": "S250401cw - PRELIMINARY",
"submitter": "cody.messick-30d512c8",
"authors": "LVK",
"data": {
"urls": {
"skymap": "https://gracedb.ligo.org/api/superevents/S250401cw/files/cwb.multiorder.fits,0",
"gracedb": "https://gracedb.ligo.org/superevents/S250401cw/view/"
},
"event": {
"far": 2.80291e-06,
"time": "2025-04-01T13:39:39.383Z",
"group": "CBC",
"search": "BBH",
"area_50": 439.78987009065145,
"area_90": 1482.192577442921,
"duration": null,
"pipeline": "CWB",
"properties": {
"HasNS": 0.0,
"HasMassGap": 0.031025641025641024,
"HasRemnant": 0.0
},
"instruments": [
"H1",
"L1"
],
"significant": false,
"skymap_hash": "a2f78fe5bd04b8043cae64a75e0099f7",
"classification": {
"BBH": 0.012419149896701676,
"BNS": 0.0,
"NSBH": 0.0,
"Terrestrial": 0.9875808501032983
},
"skymap_version": 0,
"central_frequency": null
},
"alert_type": "PRELIMINARY",
"sequence_num": 1,
"time_created": "2025-04-01T13:40:52Z",
"superevent_id": "S250401cw",
"external_coinc": null
},
"message_text": "",
"published": "2025-04-01T13:40:52.671047Z",
"message_parser": "IGWN Alert Avro Parser v1",
"retracted": false,
"created": "2025-04-01T13:40:52.671070Z",
"modified": "2025-04-01T13:40:52.679123Z"
}
},
{
"id": 8646,
"sequence_number": 2,
"sequence_type": "PRELIMINARY",
"message": {
"id": 186097,
"topic": "igwn.gwalert",
"uuid": "ff8b16c5-6583-4e93-86a1-e7d1d5436de7",
"title": "S250401cw - PRELIMINARY",
"submitter": "cody.messick-30d512c8",
"authors": "LVK",
"data": {
"urls": {
"skymap": "https://gracedb.ligo.org/api/superevents/S250401cw/files/cwb.multiorder.fits,0",
"gracedb": "https://gracedb.ligo.org/superevents/S250401cw/view/"
},
"event": {
"far": 2.80291e-06,
"time": "2025-04-01T13:39:39.383Z",
"group": "CBC",
"search": "BBH",
"area_50": 439.78987009065145,
"area_90": 1482.192577442921,
"duration": null,
"pipeline": "CWB",
"properties": {
"HasNS": 0.0,
"HasMassGap": 0.031025641025641024,
"HasRemnant": 0.0
},
"instruments": [
"H1",
"L1"
],
"significant": false,
"skymap_hash": "a2f78fe5bd04b8043cae64a75e0099f7",
"classification": {
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"BNS": 0.0,
"NSBH": 0.0,
"Terrestrial": 0.9875808501032983
},
"skymap_version": 0,
"central_frequency": null
},
"alert_type": "PRELIMINARY",
"sequence_num": 2,
"time_created": "2025-04-01T13:45:27Z",
"superevent_id": "S250401cw",
"external_coinc": null
},
"message_text": "",
"published": "2025-04-01T13:45:28.481787Z",
"message_parser": "IGWN Alert Avro Parser v1",
"retracted": false,
"created": "2025-04-01T13:45:28.481824Z",
"modified": "2025-04-01T13:45:28.492121Z"
}
}
],
"references": []
},
{
"event_id": "S190524q",
"sequences": [],
"references": [
{
"id": 186140,
"topic": "gcn.circulars",
"uuid": "28373757-2ad2-43ac-b9de-764accf3825a",
"title": "LIGO/Virgo S190524q: Retraction of GW compact binary merger candidate",
"submitter": "Brandon Piotrzkowski at U of Wisconsin-Milwaukee <piotrzk3@uwm.edu>",
"authors": "Brandon Piotrzkowski at U of Wisconsin-Milwaukee <piotrzk3@uwm.edu>",
"data": {
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/24656"
},
"email": "piotrzk3@uwm.edu",
"format": "text/plain",
"$schema": "https://gcn.nasa.gov/schema/v4.2.0/gcn/circulars.schema.json",
"bibcode": "2019GCN.24656....1L",
"eventId": "LIGO/Virgo S190524q",
"subject": "LIGO/Virgo S190524q: Retraction of GW compact binary merger candidate",
"version": 2,
"editedBy": "Judith Racusin at NASA/GSFC <judith.racusin@nasa.gov> on behalf of Tyler Barna at University of Minnesota <tylerpbarna@gmail.com>",
"editedOn": 1744224194469,
"createdOn": 1558675240000,
"submitter": "Brandon Piotrzkowski at U of Wisconsin-Milwaukee <piotrzk3@uwm.edu>",
"circularId": 24656
},
"message_text": "The LIGO Scientific Collaboration and the Virgo Collaboration report:\n\n\nThe trigger S190524q is no longer considered to be a gravitational\n\nwave signal.\n\n\nThe data in LIGO-Livingston were highly non-stationary leading up to\n\nthe reported trigger time.",
"published": "2025-05-10T16:09:47.462574Z",
"message_parser": "GCN Circular Parser v2",
"retracted": false,
"created": "2025-05-10T16:09:47.462592Z",
"modified": "2025-05-10T16:09:47.465882Z",
"targets": []
}
]
},
{
"event_id": "S200213t",
"sequences": [],
"references": [
{
"id": 186141,
"topic": "gcn.circulars",
"uuid": "b276fb07-6387-4410-b270-19271de70646",
"title": "LIGO/Virgo S200213t: No significant EM counterparts identified from continued GECKO observation of host galaxy candidates",
"submitter": "Gu Lim at Seoul National U <lim9gu@gmail.com>",
"authors": "Gu Lim at Seoul National U <lim9gu@gmail.com>",
"data": {
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/27258"
},
"email": "lim9gu@gmail.com",
"format": "text/plain",
"$schema": "https://gcn.nasa.gov/schema/v4.2.0/gcn/circulars.schema.json",
"bibcode": "2020GCN.27258....1C",
"eventId": "LIGO/Virgo S200213t",
"subject": "LIGO/Virgo S200213t: No significant EM counterparts identified from continued GECKO observation of host galaxy candidates",
"version": 2,
"editedBy": "Judith Racusin at NASA/GSFC <judith.racusin@nasa.gov> on behalf of Tyler Barna at University of Minnesota <tylerpbarna@gmail.com>",
"editedOn": 1744224210387,
"createdOn": 1582900954000,
"submitter": "Gu Lim at Seoul National U <lim9gu@gmail.com>",
"circularId": 27258
},
"message_text": "SUBJECT : LIGO/Virgo S200213t: No significant EM counterparts identified\nfrom continued GECKO observation of host galaxy candidates\n\nGu Lim (SNU), Myungshin Im (SNU), Gregory S.H. Paek (SNU), Joonho Kim\n(SNU), Sungyong Hwang (SNU), Bomi Park (SNU), Sophia Kim (SNU), Changsu\nChoi (SNU), Shuhrat A. Ehgamberdiev (UBAI), Otabek Burkhonov (UBAI), Davron\nMirzaqulov (UBAI), Hyung Mok Lee (KASI), on behalf of GECKO team\n\nWe performed follow-up observation for host galaxy candidates (Paek et al.\nGCN #27067, GCN #27119) continuously using AZT-22 1.5m telescope at\nMaidanak Astronomical Observatory in Uzbekistan in the initial and updated\nlocaliztion area of S200213t (Singer et al, GCN #27042) and overlapped\nneutrino detection area (Hussain et al, GCN #27043).\n\nNo significant EM counterpart candidates were found in the stacked images.\nSingle images were taken in B and R-band of 180 or 300 seconds. Observation\nresults are listed below. DEPTH is 5-sigma detection limit for point source\nin AB magnitude. Flux calibration is conducted using APASS DR9 catalog.\n\n NAME RA[J2000] DEC[J2000]\nDISTANCE[Mpc] DATE-OBS [UT] FILTER EXPTIME[s] DEPTH[AB]\n================================================================================================================================\nPGC11312 02:59:27.180 +31:23:09.161 169\n 2020-02-14T14:33:57 B 1500 23.35\nPGC11312 02:59:27.180 +31:23:09.161 169\n 2020-02-20T14:33:12 B 900 23.05\nPGC11312 02:59:27.180 +31:23:09.161 169\n 2020-02-14T15:01:51 R 1500 22.08\nPGC11312 02:59:27.180 +31:23:09.161 169\n 2020-02-20T14:50:37 R 900 22.64\nUGC02483 03:01:36.753 +31:49:09.293 91\n 2020-02-14T16:33:02 B 600 18.42\nUGC02483 03:01:36.753 +31:49:09.293 91\n 2020-02-20T15:53:40 B 900 22.29\nUGC02483 03:01:36.753 +31:49:09.293 91\n 2020-02-20T16:11:05 R 900 21.84\n2MASS+03014097+3153413 03:01:40.977 +31:53:41.330 97\n 2020-02-20T16:34:54 B 900 22.72\n2MASS+03014097+3153413 03:01:40.977 +31:53:41.330 97\n 2020-02-20T16:52:18 R 900 22.00\n2MASS+03012583+3135093 03:01:25.837 +31:35:09.301 254\n 2020-02-14T15:39:28 B 1500 23.40\n2MASS+03012583+3135093 03:01:25.837 +31:35:09.301 254\n 2020-02-20T15:13:47 B 900 23.18\n2MASS+03012583+3135093 03:01:25.837 +31:35:09.301 254\n 2020-02-14T16:06:57 R 1500 22.88\n\nWe thank all staff in Maidanak observatory for performing the observation.\nGravitational-wave EM Counterpart Korean Observatory (GECKO) is a network\nof 10+ 0.5m to 1m class telescopes over the world.\n���",
"published": "2025-05-10T16:09:47.497282Z",
"message_parser": "GCN Circular Parser v2",
"retracted": false,
"created": "2025-05-10T16:09:47.497300Z",
"modified": "2025-05-10T16:09:47.500590Z",
"targets": []
}
]
},
{
"event_id": "S190808ae",
"sequences": [],
"references": [
{
"id": 186148,
"topic": "gcn.circulars",
"uuid": "67da7eb5-8b5a-4f7e-8472-61b720526f47",
"title": "LIGO/Virgo S190808ae: Retraction of GW compact binary merger candidate",
"submitter": "Deep Chatterjee at University of Wisconsin, Milwaukee <deep@uwm.edu>",
"authors": "Deep Chatterjee at University of Wisconsin, Milwaukee <deep@uwm.edu>",
"data": {
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/25301"
},
"email": "deep@uwm.edu",
"format": "text/plain",
"$schema": "https://gcn.nasa.gov/schema/v4.2.0/gcn/circulars.schema.json",
"bibcode": "2019GCN.25301....1L",
"eventId": "LIGO/Virgo S190808ae",
"subject": "LIGO/Virgo S190808ae: Retraction of GW compact binary merger candidate",
"version": 2,
"editedBy": "Judith Racusin at NASA/GSFC <judith.racusin@nasa.gov> on behalf of Tyler Barna at University of Minnesota <tylerpbarna@gmail.com>",
"editedOn": 1744224288666,
"createdOn": 1565323409000,
"submitter": "Deep Chatterjee at University of Wisconsin, Milwaukee <deep@uwm.edu>",
"circularId": 25301
},
"message_text": "The LIGO Scientific Collaboration and the Virgo Collaboration report:\n\nThe trigger S190808ae (GCN Circular 25296) is no longer considered to\nbe a gravitational wave signal.\n\nFurther analysis after removing instrumental artifacts resulted in\nthe candidate no longer passing our threshold for a public alert.",
"published": "2025-05-10T16:09:47.568615Z",
"message_parser": "GCN Circular Parser v2",
"retracted": false,
"created": "2025-05-10T16:09:47.568633Z",
"modified": "2025-05-10T16:09:47.571684Z",
"targets": []
}
]
},
{
"event_id": "S190828j",
"sequences": [],
"references": [
{
"id": 186152,
"topic": "gcn.circulars",
"uuid": "4a90a273-e427-4686-bfcd-4d7849379319",
"title": "LIGO/Virgo S190828j: Updated Sky Localization",
"submitter": "Olivier Minazzoli at LIGO Virgo Collaboration <olivier.minazzoli@ligo.org>",
"authors": "Olivier Minazzoli at LIGO Virgo Collaboration <olivier.minazzoli@ligo.org>",
"data": {
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/25504"
},
"email": "olivier.minazzoli@ligo.org",
"format": "text/plain",
"$schema": "https://gcn.nasa.gov/schema/v4.2.0/gcn/circulars.schema.json",
"bibcode": "2019GCN.25504....1L",
"eventId": "LIGO/Virgo S190828j",
"subject": "LIGO/Virgo S190828j: Updated Sky Localization",
"version": 2,
"editedBy": "Judith Racusin at NASA/GSFC <judith.racusin@nasa.gov> on behalf of Tyler Barna at University of Minnesota <tylerpbarna@gmail.com>",
"editedOn": 1744224249945,
"createdOn": 1566982579000,
"submitter": "Olivier Minazzoli at LIGO Virgo Collaboration <olivier.minazzoli@ligo.org>",
"circularId": 25504
},
"message_text": "The LIGO Scientific Collaboration and Virgo Collaboration report:\n\nWe have updated the skymap for the compact binary merger candidate S190828j\n(GCN 25497). The event's properties can be found at this URL:\n\nhttps://gracedb.ligo.org/superevents/S190828j/\n\nbayestar.fits.gz is the preferred sky map at this time and can be retrieved\nfrom the\n\nGraceDB event page:\n\n * bayestar.fits.gz, an updated localization generated by BAYESTAR [1],\ndistributed via GCN update notice about 1.5 hours after the candidate\n\nThe 90% credible region is 587 deg2. Marginalized over the whole sky, the a\nposteriori luminosity distance estimate is 1803 +/- 423 Mpc (a posteriori\nmean +/- standard deviation).\n\nNote that S190828j (GCN 25497) and S190828l (GCN 25503) are distinct events\nthat occurred 21 minutes apart.\n\nFor further information about analysis methodology and the contents of this\nalert, refer to the LIGO/Virgo Public Alerts User Guide <\nhttps://emfollow.docs.ligo.org/userguide/>.\n\n [1] Singer & Price PRD 93, 024013 (2016)",
"published": "2025-05-10T16:09:47.617195Z",
"message_parser": "GCN Circular Parser v2",
"retracted": false,
"created": "2025-05-10T16:09:47.617224Z",
"modified": "2025-05-10T16:09:47.620492Z",
"targets": []
}
]
},
{
"event_id": "S190425z",
"sequences": [],
"references": [
{
"id": 186161,
"topic": "gcn.circulars",
"uuid": "4408dd85-ac79-4dc8-bd7a-f293050169ea",
"title": "LIGO/Virgo S190425z: GRAWITA LBT spectroscopic observations",
"submitter": "Roberta Carini at INAF <roberta.carini@inaf.it>",
"authors": "Roberta Carini at INAF <roberta.carini@inaf.it>",
"data": {
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/24252"
},
"email": "roberta.carini@inaf.it",
"format": "text/plain",
"$schema": "https://gcn.nasa.gov/schema/v4.2.0/gcn/circulars.schema.json",
"bibcode": "2019GCN.24252....1C",
"eventId": "LIGO/Virgo S190425z",
"subject": "LIGO/Virgo S190425z: GRAWITA LBT spectroscopic observations",
"version": 2,
"editedBy": "Judith Racusin at NASA/GSFC <judith.racusin@nasa.gov> on behalf of Tyler Barna at University of Minnesota <tylerpbarna@gmail.com>",
"editedOn": 1744224396340,
"createdOn": 1556321791000,
"submitter": "Roberta Carini at INAF <roberta.carini@inaf.it>",
"circularId": 24252
},
"message_text": "R. Carini (INAF-OAR), L. Izzo (IAA), E. Palazzi (INAF-OAS), D. Sand (U of\nArizona), A. Rossi (INAF-OAS), L. Cassar�� (INAF-IASF Mi), A. Gargiulo\n(INAF-IASF Mi), P. D'Avanzo (INAF-OAB), A. Melandri (INAF-OAB), L.\nTomasella (INAF-OAPd), S. Benetti (INAF-OAPd), M.T. Botticella\n(INAF-OAC), M. Branchesi (GSSI), V. D'Elia (ASI-SSDC), E. Brocato\n(INAF-OAAb, INAF-OAR), M. Della Valle (INAF-OAPd), G. Greco (Univ.\nUrbino), O. Kuhn (LBTO), I. Shivaei (U of Arizona), X. Fan (U of\nArizona), J. Andrews (U of Arizona), W.-F. Fong (Northwestern), K. Paterson\n(Northwestern), M. Lundquist (U of Arizona), F. Cusano (INAF-OAS) on behalf\nof GRAWITA report:\n\n\n\nWe observed the transient source AT2019ebq/PS19qp reported by Pan-STARRS\n(Smith, et al., GCN 24210) within the skymap of the GW event S190425z (GCN\n24168) with the two 8.4 m telescopes of the Large Binocular Telescope (LBT,\nMount Graham, Arizona) equipped with the MODS1 and MODS2 cameras in\nspectroscopic mode. The observations started on 2019-04-26 at 11:00:44 UT.\nFour optical spectra, lasting 600 s each, were obtained using the dual\ngrating (wavelength range ~ 320-1000 nm).\n\nThe combined spectrum has a low S/N. A classification attempt performed\nwith GELATO (Harutyunyan et al., 2008, A&A, 488, 383) shows that the\nspectrum is similar to those of type Ib/c SNe few days after the maximum.\nOur results are in agreement with the findings of Morokuma et al. (GCN\n24230) and Jencson et al. (GCN 24233).\n\n\n\nWe thank the LBT team for the observations.\n\n[GCN OPS NOTE(27apr19): Per author's request, Kuhn's affilliation was changed\nto LBTO.]",
"published": "2025-05-10T16:09:47.708124Z",
"message_parser": "GCN Circular Parser v2",
"retracted": false,
"created": "2025-05-10T16:09:47.708142Z",
"modified": "2025-05-10T16:09:47.711356Z",
"targets": []
}
]
},
{
"event_id": "S190421ar",
"sequences": [],
"references": [
{
"id": 186165,
"topic": "gcn.circulars",
"uuid": "2ed6e9f4-008b-4796-a28f-91bdcf134376",
"title": "LIGO/VIRGO S190421ar: IceCube Neutrino Search",
"submitter": "Erik Blaufuss at U. Maryland/IceCube <blaufuss@umd.edu>",
"authors": "Erik Blaufuss at U. Maryland/IceCube <blaufuss@umd.edu>",
"data": {
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/24142"
},
"email": "blaufuss@umd.edu",
"format": "text/plain",
"$schema": "https://gcn.nasa.gov/schema/v4.2.0/gcn/circulars.schema.json",
"bibcode": "2019GCN.24142....1I",
"eventId": "LIGO/VIRGO S190421ar",
"subject": "LIGO/VIRGO S190421ar: IceCube Neutrino Search",
"version": 2,
"editedBy": "Judith Racusin at NASA/GSFC <judith.racusin@nasa.gov> on behalf of Tyler Barna at University of Minnesota <tylerpbarna@gmail.com>",
"editedOn": 1744226276016,
"createdOn": 1555955628000,
"submitter": "Erik Blaufuss at U. Maryland/IceCube <blaufuss@umd.edu>",
"circularId": 24142
},
"message_text": "The IceCube Collaboration (http://icecube.wisc.edu/) reports:\n\nIceCube has performed a search for track-like muon neutrino events\nconsistent with the sky localization of S190421ar in a time range of 1000\nseconds centered on the alert event time (2019-04-21 21:30:36.251 UTC to \n2019-04-21 21:47:16.251 UTC)\nduring which IceCube was collecting good quality data.\nNo track-like events are found in spatial coincidence with the 90% \nspatial containment of S190421ar calculated from the map\ncirculated in the preliminary notice.\n\nIceCube's sensitivity to point sources within the location spanned by \nthe 90% spatial containment of S190421ar ranges from\n0.029 to 1.150 GeV cm^-2 in a 1000 second time window.\n\nThe IceCube Neutrino Observatory is a cubic-kilometer neutrino detector \noperating at the geographic South Pole, Antarctica.\nThe IceCube realtime alert point of contact can be reached at \nroc@icecube.wisc.edu",
"published": "2025-05-10T16:09:47.752688Z",
"message_parser": "GCN Circular Parser v2",
"retracted": false,
"created": "2025-05-10T16:09:47.752705Z",
"modified": "2025-05-10T16:09:47.755977Z",
"targets": []
}
]
},
{
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"sequences": [
{
"id": 8913,
"sequence_number": 1,
"sequence_type": "PRELIMINARY",
"message": {
"id": 307509,
"topic": "igwn.gwalert",
"uuid": "8dc2c3ff-a1d6-44cf-8059-398c06cb86af",
"title": "S250628f - PRELIMINARY",
"submitter": "cody.messick-30d512c8",
"authors": "LVK",
"data": {
"urls": {
"gracedb": "https://gracedb.ligo.org/superevents/S250628f/view/"
},
"event": {
"far": 2.9545144055824087e-06,
"time": "2025-06-28T02:27:57.360Z",
"group": "Burst",
"search": "AllSky",
"area_50": 7640.929346002465,
"area_90": 22667.642769863196,
"duration": 0.1875,
"pipeline": "MLy",
"properties": {},
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],
"significant": false,
"skymap_hash": "2af34e7bf4b4f4aff160d18ab41bb8c0",
"classification": {},
"skymap_version": 0,
"central_frequency": 104.0
},
"alert_type": "PRELIMINARY",
"sequence_num": 1,
"time_created": "2025-06-28T02:28:46Z",
"superevent_id": "S250628f",
"external_coinc": null
},
"message_text": "",
"published": "2025-06-28T02:28:48.310924Z",
"message_parser": "IGWN Alert Avro Parser v1",
"retracted": false,
"created": "2025-06-28T02:28:48.310943Z",
"modified": "2025-06-28T02:28:48.316122Z"
}
},
{
"id": 8914,
"sequence_number": 2,
"sequence_type": "PRELIMINARY",
"message": {
"id": 307529,
"topic": "igwn.gwalert",
"uuid": "243301a0-4b30-4a52-92c9-3981de8b55a7",
"title": "S250628f - PRELIMINARY",
"submitter": "cody.messick-30d512c8",
"authors": "LVK",
"data": {
"urls": {
"gracedb": "https://gracedb.ligo.org/superevents/S250628f/view/"
},
"event": {
"far": 2.9545144055824087e-06,
"time": "2025-06-28T02:27:57.360Z",
"group": "Burst",
"search": "AllSky",
"area_50": 7640.929346002465,
"area_90": 22667.642769863196,
"duration": 0.1875,
"pipeline": "MLy",
"properties": {},
"instruments": [
"H1",
"L1"
],
"significant": false,
"skymap_hash": "2af34e7bf4b4f4aff160d18ab41bb8c0",
"classification": {},
"skymap_version": 0,
"central_frequency": 104.0
},
"alert_type": "PRELIMINARY",
"sequence_num": 2,
"time_created": "2025-06-28T02:33:20Z",
"superevent_id": "S250628f",
"external_coinc": null
},
"message_text": "",
"published": "2025-06-28T02:33:22.236160Z",
"message_parser": "IGWN Alert Avro Parser v1",
"retracted": false,
"created": "2025-06-28T02:33:22.236178Z",
"modified": "2025-06-28T02:33:22.240584Z"
}
}
],
"references": []
},
{
"event_id": "S250628m",
"sequences": [
{
"id": 8915,
"sequence_number": 1,
"sequence_type": "PRELIMINARY",
"message": {
"id": 307712,
"topic": "igwn.gwalert",
"uuid": "6a373bea-5022-46b2-8f11-09c729cf4c4e",
"title": "S250628m - PRELIMINARY",
"submitter": "cody.messick-30d512c8",
"authors": "LVK",
"data": {
"urls": {
"skymap": "https://gracedb.ligo.org/api/superevents/S250628m/files/bayestar.multiorder.fits,0",
"gracedb": "https://gracedb.ligo.org/superevents/S250628m/view/"
},
"event": {
"far": 6.968265056825623e-06,
"time": "2025-06-28T03:15:06.832Z",
"group": "CBC",
"search": "AllSky",
"area_50": 2078.0910655428493,
"area_90": 13616.700099905975,
"duration": null,
"pipeline": "gstlal",
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{
"id": 186464,
"topic": "gcn.circulars",
"uuid": "107f9f4f-21f0-4189-a8a1-74d2ee55a913",
"title": "LIGO/Virgo/KAGRA S250331o: NED Galaxies in the 3-Initial Localization Volume",
"submitter": "David Cook at Caltech/IPAC-NED <dcook@ipac.caltech.edu>",
"authors": "David Cook at Caltech/IPAC-NED <dcook@ipac.caltech.edu>",
"data": {
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},
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"bibcode": "2025GCN.39975....1C",
"eventId": "LIGO/Virgo/KAGRA S250331o",
"subject": "LIGO/Virgo/KAGRA S250331o: NED Galaxies in the 3-Initial Localization Volume",
"createdOn": 1743436112055,
"submitter": "David Cook at Caltech/IPAC-NED <dcook@ipac.caltech.edu>",
"circularId": 39975,
"submittedHow": "web"
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"message_text": "David O. Cook (Caltech/IPAC), Rick Ebert (Caltech/IPAC), George Helou (Caltech/IPAC), Joseph M. Mazzarella (Caltech/IPAC), Marion Schmitz (Caltech/IPAC), and Leo Singer (NASA/GSFC)\n\nOn behalf of the NASA/IPAC Extragalactic Database (NED) Team.\n\nWe spatially cross-matched the LVK S250331o-3-Initial sky localization with the NED Local Volume Sample (NED-LVS; Cook et al. 2023), which is a subset of NED with a redshift or redshift-independent distance less than 1000 Mpc. We find 582 galaxies within the 90% containment volume, and we list here the top 20 galaxies sorted by the joint probability of the 3D localization and the WISE W1 luminosity (an observable proxy for stellar mass). For the full or top 20 list of galaxies in the 90% volume go either to the NED Gravitational Wave Followup service at https://ned.ipac.caltech.edu/uri/NED::GWF/ or click on the following links:\n\nFull List Download: https://ned.ipac.caltech.edu/uri/NED::GWFglist/fits/S250331o/3 \nTop 20 List Download: https://ned.ipac.caltech.edu/uri/NED::GWFglist/fits/S250331o/3/20\n\nThe NED-GWF service provides downloadable galaxy lists and visualizations for candidate host galaxies. For each GW alert, these products are automatically generated and made available within minutes to expedite efficient electromagnetic follow-up observations. The NED top 20 list is sorted by the joint probability of the 3D localization and the WISE W1 luminosity, but users can sort on additional pre-computed prioritization metrics (star formation rate, P_3D * P_SFR; and specific star formation rate, P_3D * P_sSFR; etc.) which are available via downloading the entire galaxy list inside the event's probability volume.\n\n| objname| ra| dec|objtype| DistMpc|DistMpc_unc| m_NUV| m_NUV_unc| m_Ks| m_Ks_unc| m_W1| m_W1_unc| P_3D|P_3D_LumW1|\n|-------------------------|--------------|--------------|-------|-----------|-----------|------------|------------|------------|------------|------------|------------|--------|----------|\n|WISEA J020352.96+300418.6| 30.97068| 30.07186| G| 450.96| null| null| null| 13.417| 0.135| 10.147| 0.006|2.21e-06| 3.99e-08|\n|WISEA J020524.84+300356.4| 31.35354| 30.06568| G| 653.76| null| null| null| 13.537| 0.143| 12.061| 0.009|1.69e-06| 1.10e-08|\n| 3C 059 NED01| 31.75919| 29.51278| G| 510.64| 2.89| 18.553| 0.047| 12.531| 0.068| 11.452| 0.006|1.47e-06| 1.02e-08|\n|WISEA J020815.86+330236.7| 32.06612| 33.04354| G| 528.82| null| null| null| 12.409| 0.098| 12.307| 0.010|1.99e-06| 6.80e-09|\n|WISEA J020728.78+301402.8| 31.86992| 30.23411| G| 488.46| null| 22.228| 0.345| 12.899| 0.118| 12.205| 0.008|2.12e-06| 6.76e-09|\n|WISEA J021035.33+303608.5| 32.64721| 30.60238| G| 569.79| null| null| null| 12.895| 0.117| 12.315| 0.013|1.64e-06| 6.45e-09|\n|WISEA J020735.81+301139.9| 31.89924| 30.19442| G| 697.62| null| null| null| 13.258| 0.120| 12.206| 0.008|9.86e-07| 6.42e-09|\n|WISEA J020447.91+305422.6| 31.19964| 30.90630| G| 421.78| null| null| null| 12.281| 0.097| 11.835| 0.007|1.92e-06| 6.41e-09|\n|WISEA J021036.53+303612.4| 32.65223| 30.60347| G| 607.46| null| null| null| 13.762| 0.178| 12.435| 0.008|1.55e-06| 6.19e-09|\n|WISEA J020031.78+285022.0| 30.13243| 28.83945| G| 548.45| null| null| null| 13.274| 0.142| 12.152| 0.008|1.32e-06| 5.57e-09|\n|WISEA J020247.16+295941.4| 30.69650| 29.99484| G| 557.31| null| 20.629| 0.118| 13.505| 0.133| 12.951| 0.014|2.62e-06| 5.47e-09|\n|WISEA J020311.55+300127.5| 30.79816| 30.02432| G| 512.31| 0.08| null| null| 13.071| 0.101| 12.808| 0.010|2.61e-06| 5.24e-09|\n|WISEA J021613.00+340524.3| 34.05421| 34.09010| G| 677.00| null| null| null| 13.485| 0.160| 11.789| 0.007|5.73e-07| 5.16e-09|\n|WISEA J020959.78+325524.0| 32.49910| 32.92334| G| 589.92| 0.10| 21.761| 0.336| 13.738| 0.179| 13.027| 0.012|2.33e-06| 5.10e-09|\n|WISEA J020619.97+294730.7| 31.58324| 29.79188| G| 507.55| 0.07| null| null| 12.533| 0.104| 12.599| 0.020|2.12e-06| 5.09e-09|\n|WISEA J020633.75+303828.7| 31.64066| 30.64131| G| 429.37| null| null| null| 12.181| 0.101| 12.041| 0.008|1.73e-06| 4.95e-09|\n| VI Zw 139| 30.40470| 30.82735| G| 509.90| 0.06| null| null| 13.148| 0.120| 12.551| 0.009|1.91e-06| 4.80e-09|\n|WISEA J020659.62+303130.8| 31.74842| 30.52523| G| 462.52| null| 21.179| 0.192| 13.405| 0.144| 12.477| 0.009|2.02e-06| 4.49e-09|\n|WISEA J020919.83+314709.5| 32.33265| 31.78598| G| 656.06| 0.12| null| null| 14.209| 0.268| 13.409| 0.016|2.34e-06| 4.46e-09|\n|WISEA J020626.94+302913.7| 31.61227| 30.48715| G| 672.91| 0.08| null| null| 13.829| 0.091| 13.152| 0.013|1.69e-06| 4.27e-09|\n\nTable 1: Top 20 galaxies in NED-LVS that fall in the 90% probability volume for S250331o sorted by the joint probability of 3D position and WISE W1 luminosity (P_3D * P_LumW1). Galaxy is the NED preferred name. RA and Dec are the Equatorial coordinates in degrees (J2000). Objtype is the object type of the galaxy candidate. Distance is the distance to the galaxy in Mpc. m_NUV and mErr_NUV are the apparent magnitude and error from GALEX. m_Ks and mErr_Ks are the apparent magnitude and error from 2MASS. m_W1 and mErr_W1 are the apparent magnitude and error from AllWISE. P_3D is the probability that the galaxy is in the volume given the distance of GW event. P_3D_LumW1 is the joint probability within the volume weighted by the WISE1 luminosity of the galaxy (P_3D * P_LumW1). \n",
"published": "2025-05-10T16:09:51.370934Z",
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"retracted": false,
"created": "2025-05-10T16:09:51.370951Z",
"modified": "2025-05-10T16:09:51.374020Z",
"targets": []
},
{
"id": 186436,
"topic": "gcn.circulars",
"uuid": "50b8596f-58ea-4afc-8b06-fdf6cd6b8bd5",
"title": "LIGO/Virgo/KAGRA S250331o: Updated Sky localization",
"submitter": "Michael J. Williams at University of Portsmouth <michael.williams@ligo.org>",
"authors": "Michael J. Williams at University of Portsmouth <michael.williams@ligo.org>",
"data": {
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},
"format": "text/plain",
"$schema": "https://gcn.nasa.gov/schema/v4.2.0/gcn/circulars.schema.json",
"bibcode": "2025GCN.39986....1L",
"eventId": "LIGO/Virgo/KAGRA S250331o",
"subject": "LIGO/Virgo/KAGRA S250331o: Updated Sky localization",
"createdOn": 1743450646734,
"submitter": "Michael J. Williams at University of Portsmouth <michael.williams@ligo.org>",
"circularId": 39986,
"submittedHow": "web"
},
"message_text": "The LIGO Scientific Collaboration, the Virgo Collaboration, and the KAGRA Collaboration report:\n\nWe have conducted further analysis of the LIGO Hanford Observatory (H1), LIGO Livingston Observatory (L1), and Virgo Observatory (V1) data around the time of the compact binary merger (CBC) candidate S250331o (GCN Circular 39953). Parameter estimation has been performed using Bilby [1] and a new sky map, Bilby.multiorder.fits,0, distributed via GCN Notice, is available for retrieval from the GraceDB event page:\n\nhttps://gracedb.ligo.org/superevents/S250331o\n\nFor the Bilby.multiorder.fits,0 sky map, the 90% credible region is well fit by an ellipse with an area of 18 deg2 described by the following DS9 region (right ascension, declination, semi-major axis, semi-minor axis, position angle of the semi-minor axis):\n icrs; ellipse(02h07m, +31d03m, 3.98d, 1.46d, 114.57d)\nMarginalized over the whole sky, the a posteriori luminosity distance estimate is 657 +/- 91 Mpc (a posteriori mean +/- standard deviation).\n\nFor further information about analysis methodology and the contents of this alert, refer to the LIGO/Virgo/KAGRA Public Alerts User Guide https://emfollow.docs.ligo.org/.\n\n [1] Ashton et al. ApJS 241, 27 (2019) doi:10.3847/1538-4365/ab06fc and Morisaki et al. PRD 108, 123040 (2023) doi:10.1103/PhysRevD.108.123040",
"published": "2025-05-10T16:09:51.089353Z",
"message_parser": "GCN Circular Parser v2",
"retracted": false,
"created": "2025-05-10T16:09:51.089371Z",
"modified": "2025-05-10T16:09:51.092765Z",
"targets": []
},
{
"id": 186369,
"topic": "gcn.circulars",
"uuid": "245c1308-10fc-4a9f-a3de-728077a215a4",
"title": "LIGO/Virgo/KAGRA S250331o: Identification of a GW compact binary merger candidate",
"submitter": "Gyoik Kim at Yonsei University <gyoik_kim@yonsei.ac.kr>",
"authors": "Gyoik Kim at Yonsei University <gyoik_kim@yonsei.ac.kr>",
"data": {
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},
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"$schema": "https://gcn.nasa.gov/schema/v4.2.0/gcn/circulars.schema.json",
"bibcode": "2025GCN.39953....1L",
"eventId": "LIGO/Virgo/KAGRA S250331o",
"subject": "LIGO/Virgo/KAGRA S250331o: Identification of a GW compact binary merger candidate",
"createdOn": 1743386814469,
"submitter": "Gyoik Kim at Yonsei University <gyoik_kim@yonsei.ac.kr>",
"circularId": 39953,
"submittedHow": "web"
},
"message_text": "The LIGO Scientific Collaboration, the Virgo Collaboration, and the KAGRA Collaboration report:\n\nWe identified the compact binary merger candidate S250331o during real-time processing of data from LIGO Hanford Observatory (H1), LIGO Livingston Observatory (L1), and Virgo Observatory (V1) at 2025-03-31 01:34:48.438 UTC (GPS time: 1427420106.438). The candidate was found by the cWB [1], cWB BBH [2], GstLAL [3], PyCBC Live [4], and SPIIR [5] analysis pipelines.\n\nS250331o is an event of interest because its false alarm rate, as estimated by the online analysis, is 3.2e-10 Hz, or about one in 1e2 years. The event's properties can be found at this URL:\n\nhttps://gracedb.ligo.org/superevents/S250331o\n\nAfter parameter estimation by RapidPE-RIFT [6], the classification of the GW signal, in order of descending probability, is BBH (>99%), Terrestrial (<1%), NSBH (<1%), or BNS (<1%).\n\nAssuming the candidate is astrophysical in origin, the probability that at least one of the compact objects is consistent with a neutron star mass (HasNS) is <1%. [7] Using the masses and spins inferred from the signal, the probability of matter outside the final compact object (HasRemnant) is <1%. [7] Both HasNS and HasRemnant consider the support of several neutron star equations of state for maximum neutron star mass. The probability that either of the binary components lies between 3 and 5 solar masses (HasMassGap) is <1%.\n\nTwo sky maps are available at this time and can be retrieved from the GraceDB event page:\n * bayestar.multiorder.fits,0, an initial localization generated by BAYESTAR [8], distributed via GCN notice about 23 seconds after the candidate event time.\n * bayestar.multiorder.fits,1, an initial localization generated by BAYESTAR [8], distributed via GCN notice about 5 minutes after the candidate event time.\n\nThe preferred sky map at this time is bayestar.multiorder.fits,1. For the bayestar.multiorder.fits,1 sky map, the 90% credible region is well fit by an ellipse with an area of 27 deg2 described by the following DS9 region (right ascension, declination, semi-major axis, semi-minor axis, position angle of the semi-minor axis):\n icrs; ellipse(02h07m, +31d24m, 4.57d, 1.87d, 116.86d)\nMarginalized over the whole sky, the a posteriori luminosity distance estimate is 582 +/- 120 Mpc (a posteriori mean +/- standard deviation).\n\nFor further information about analysis methodology and the contents of this alert, refer to the LIGO/Virgo/KAGRA Public Alerts User Guide https://emfollow.docs.ligo.org/.\n\n [1] Klimenko et al. PRD 93, 042004 (2016) doi:10.1103/PhysRevD.93.042004\n [2] T. Mishra et al. PRD 105, 083018 (2022) doi:10.1103/PhysRevD.105.083018\n [3] Tsukada et al. PRD 108, 043004 (2023) doi:10.1103/PhysRevD.108.043004 and Ewing et al. PRD 109, 042008 (2024) doi:10.1103/PhysRevD.109.042008\n [4] Dal Canton et al. ApJ 923, 254 (2021) doi:10.3847/1538-4357/ac2f9a\n [5] Chu et al. PRD 105, 024023 (2022) doi:10.1103/PhysRevD.105.024023\n [6] Rose et al. (2022) arXiv:2201.05263 and Pankow et al. PRD 92, 023002 (2015) doi:10.1103/PhysRevD.92.023002\n [7] Chatterjee et al. ApJ 896, 54 (2020) doi:10.3847/1538-4357/ab8dbe\n [8] Singer & Price PRD 93, 024013 (2016) doi:10.1103/PhysRevD.93.024013\n",
"published": "2025-05-10T16:09:50.470206Z",
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{
"id": 186318,
"topic": "gcn.circulars",
"uuid": "75442f5b-6391-40bf-8c89-fc2ea8125ca4",
"title": "LIGO/Virgo/KAGRA S250331o: Upper limits from Swift/BAT-GUANO",
"submitter": "Maia Williams at PSU <mjw6837@psu.edu>",
"authors": "Maia Williams at PSU <mjw6837@psu.edu>",
"data": {
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"bibcode": "2025GCN.40109....1W",
"eventId": "LIGO/Virgo/KAGRA S250331o",
"subject": "LIGO/Virgo/KAGRA S250331o: Upper limits from Swift/BAT-GUANO",
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"submitter": "Maia Williams at PSU <mjw6837@psu.edu>",
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"submittedHow": "web"
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"message_text": "Maia Williams (PSU), Samuele Ronchini (PSU), Gayathri Raman (PSU), James DeLaunay (PSU), Tyler Parsotan (NASA GSFC), Jamie A. Kennea (PSU), Aaron Tohuvavohu (Caltech) report:\n\nSwift/BAT was observing 100.0% of the GW localization probability ([Bilby.multiorder.fits](https://gracedb.ligo.org/api/superevents/S250331o/files/Bilby.multiorder.fits)) at merger time. A fraction 96.02% of the GW localization posterior is contained inside the BAT coded FoV.\n\nThe LVK notice, distributed in near real-time, triggered the Swift Mission Operations Center operated Gamma-ray Urgent Archiver for Novel Opportunities (GUANO; [Tohuvavohu et al. 2020, ApJ, 900, 1](https://iopscience.iop.org/article/10.3847/1538-4357/aba94f)).\n\nUpon trigger by this notice, GUANO sent a command to the Swift Burst Alert Telescope (BAT) to save 200 seconds of BAT event-mode data from [-50,+150] seconds around the time of the burst. All the requested event mode data was delivered to the ground.\n\nUsing the NITRATES analysis ([DeLaunay + Tohuvavohu 2022, ApJ, 941, 169](https://iopscience.iop.org/article/10.3847/1538-4357/ac9d38)) we searched for emission on 8 timescales from 0.128s to 16.384s in the interval [-20,+20] seconds around the merger time. We find no evidence for a signal, and derive the following upper limits.\n\nWe quote the 5-sigma flux upper limits in the 15-350 keV band, weighted over the GW localization, for four spectral templates (soft, normal, and hard GRB-like templates described in [arXiv:1612.02395], and spectral shape from GRB170817A [arXiv:1710.05446]) and for four time bins.\nIn units of 10^-7 erg/s/cm^2:\n\n|time_bin (s) |soft |normal|hard |GRB170817\n|-|-|-|-|-|\n|0.256 |3.32 |3.49 |3.33 |3.61 \n|1.024 |1.69 |1.78 |1.70 |1.84 \n|4.096 |0.91 |0.95 |0.91 |0.99 \n|16.384 |0.55 |0.58 |0.56 |0.60 \n\n\nThe upper limits as function of sky position are plotted here, alongside the GW localization:\nhttps://zenodo.org/records/15169889\n\nThe solid and dashed lines indicate the 90% and 50% GW contour levels, respectively. The corresponding fits file is also included.\n\nGUANO is a fully autonomous, extremely low latency, spacecraft commanding pipeline designed for targeted recovery of BAT event mode data around the times of compelling astrophysical events to enable more sensitive GRB searches.\n\nA live reporting of Swift/BAT event data recovered by GUANO can be found at: https://www.swift.psu.edu/guano/",
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"title": "S250628aa - PRELIMINARY",
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"message_text": "TITLE: GCN/AMON NOTICE\nNOTICE_DATE: Tue 29 Apr 25 19:07:54 UT\nNOTICE_TYPE: ICECUBE Astrotrack Gold \nSTREAM: 24\nRUN_NUM: 140870\nEVENT_NUM: 26727884\nSRC_RA: 59.6799d {+03h 58m 43s} (J2000),\n 60.0622d {+04h 00m 15s} (current),\n 58.9265d {+03h 55m 42s} (1950)\nSRC_DEC: +25.3200d {+25d 19' 12\"} (J2000),\n +25.3908d {+25d 23' 27\"} (current),\n +25.1779d {+25d 10' 40\"} (1950)\nSRC_ERROR: 28.05 [arcmin radius, stat-only, 90% containment]\nSRC_ERROR50: 14.39 [arcmin radius, stat-only, 50% containment]\nDISCOVERY_DATE: 20794 TJD; 119 DOY; 25/04/29 (yy/mm/dd)\nDISCOVERY_TIME: 55395 SOD {15:23:15.62} UT\nREVISION: 1\nENERGY: 3.9737e+02 [TeV]\nSIGNALNESS: 8.2016e-01 [dn]\nFAR: 0.4961 [yr^-1]\nSUN_POSTN: 37.31d {+02h 29m 15s} +14.72d {+14d 43' 21\"}\nSUN_DIST: 23.83 [deg] Sun_angle= -1.5 [hr] (East of Sun)\nMOON_POSTN: 65.34d {+04h 21m 21s} +26.41d {+26d 24' 25\"}\nMOON_DIST: 4.85 [deg]\nGAL_COORDS: 167.78,-20.82 [deg] galactic lon,lat of the event\nECL_COORDS: 62.75, 4.70 [deg] ecliptic lon,lat of the event\nCOMMENTS: IceCube Gold event. \nCOMMENTS: The position error is statistical only, there is no systematic added. \n",
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"message_text": "TITLE: GCN/AMON NOTICE\nNOTICE_DATE: Tue 29 Apr 25 19:07:54 UT\nNOTICE_TYPE: ICECUBE Astrotrack Gold \nSTREAM: 24\nRUN_NUM: 140870\nEVENT_NUM: 26727884\nSRC_RA: 59.6799d {+03h 58m 43s} (J2000),\n 60.0622d {+04h 00m 15s} (current),\n 58.9265d {+03h 55m 42s} (1950)\nSRC_DEC: +25.3200d {+25d 19' 12\"} (J2000),\n +25.3908d {+25d 23' 27\"} (current),\n +25.1779d {+25d 10' 40\"} (1950)\nSRC_ERROR: 28.05 [arcmin radius, stat-only, 90% containment]\nSRC_ERROR50: 14.39 [arcmin radius, stat-only, 50% containment]\nDISCOVERY_DATE: 20794 TJD; 119 DOY; 25/04/29 (yy/mm/dd)\nDISCOVERY_TIME: 55395 SOD {15:23:15.62} UT\nREVISION: 1\nENERGY: 3.9737e+02 [TeV]\nSIGNALNESS: 8.2016e-01 [dn]\nFAR: 0.4961 [yr^-1]\nSUN_POSTN: 37.31d {+02h 29m 15s} +14.72d {+14d 43' 21\"}\nSUN_DIST: 23.83 [deg] Sun_angle= -1.5 [hr] (East of Sun)\nMOON_POSTN: 65.34d {+04h 21m 21s} +26.41d {+26d 24' 25\"}\nMOON_DIST: 4.85 [deg]\nGAL_COORDS: 167.78,-20.82 [deg] galactic lon,lat of the event\nECL_COORDS: 62.75, 4.70 [deg] ecliptic lon,lat of the event\nCOMMENTS: IceCube Gold event. \nCOMMENTS: The position error is statistical only, there is no systematic added. \n",
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"gal_coords": "167.84,-20.92 [deg] galactic lon,lat of the event",
"moon_postn": "62.82d {+04h 11m 16s} +25.93d {+25d 55' 56\"}",
"signalness": "8.2016e-01 [dn]",
"notice_date": "Tue 29 Apr 25 15:24:15 UT",
"notice_type": "ICECUBE Astrotrack Gold",
"src_error50": "12.00 [arcmin radius, stat-only, 50% containment]",
"discovery_date": "20794 TJD; 119 DOY; 25/04/29 (yy/mm/dd)",
"discovery_time": "55395 SOD {15:23:15.62} UT"
},
"message_text": "TITLE: GCN/AMON NOTICE\nNOTICE_DATE: Tue 29 Apr 25 15:24:15 UT\nNOTICE_TYPE: ICECUBE Astrotrack Gold \nSTREAM: 24\nRUN_NUM: 140870\nEVENT_NUM: 26727884\nSRC_RA: 59.6563d {+03h 58m 38s} (J2000),\n 60.0383d {+04h 00m 09s} (current),\n 58.9035d {+03h 55m 37s} (1950)\nSRC_DEC: +25.2127d {+25d 12' 46\"} (J2000),\n +25.2835d {+25d 17' 01\"} (current),\n +25.0705d {+25d 04' 14\"} (1950)\nSRC_ERROR: 30.80 [arcmin radius, stat-only, 90% containment]\nSRC_ERROR50: 12.00 [arcmin radius, stat-only, 50% containment]\nDISCOVERY_DATE: 20794 TJD; 119 DOY; 25/04/29 (yy/mm/dd)\nDISCOVERY_TIME: 55395 SOD {15:23:15.62} UT\nREVISION: 0\nENERGY: 3.9737e+02 [TeV]\nSIGNALNESS: 8.2016e-01 [dn]\nFAR: 0.4961 [yr^-1]\nSUN_POSTN: 37.17d {+02h 28m 40s} +14.67d {+14d 40' 29\"}\nSUN_DIST: 23.92 [deg] Sun_angle= -1.5 [hr] (East of Sun)\nMOON_POSTN: 62.82d {+04h 11m 16s} +25.93d {+25d 55' 56\"}\nMOON_DIST: 2.59 [deg]\nGAL_COORDS: 167.84,-20.92 [deg] galactic lon,lat of the event\nECL_COORDS: 62.71, 4.60 [deg] ecliptic lon,lat of the event\nCOMMENTS: IceCube Gold event. \nCOMMENTS: The position error is statistical only, there is no systematic added. \n",
"published": "2025-04-29T15:24:15Z",
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"data": {
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"data": {
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"urls": {
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"title": "GCN/AMON NOTICE",
"energy": "1.1447e+02 [TeV]",
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"comments": "IceCube Bronze event.\nThe position error is statistical only, there is no systematic added.",
"revision": "0",
"sun_dist": "56.96 [deg] Sun_angle= -3.9 [hr] (East of Sun)",
"event_num": "37236133",
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"signalness": "3.4842e-01 [dn]",
"notice_date": "Wed 16 Apr 25 18:33:11 UT",
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"discovery_date": "20781 TJD; 106 DOY; 25/04/16 (yy/mm/dd)",
"discovery_time": "66734 SOD {18:32:14.97} UT"
},
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"topic": "gcn.classic.text.ICECUBE_ASTROTRACK_BRONZE",
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"revision": "1",
"sun_dist": "56.89 [deg] Sun_angle= -3.9 [hr] (East of Sun)",
"event_num": "37236133",
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"src_error": "31.21 [arcmin radius, stat-only, 90% containment]",
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"signalness": "3.4842e-01 [dn]",
"notice_date": "Wed 16 Apr 25 20:18:31 UT",
"notice_type": "ICECUBE Astrotrack Bronze",
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"discovery_date": "20781 TJD; 106 DOY; 25/04/16 (yy/mm/dd)",
"discovery_time": "73074 SOD {20:17:54.00} UT"
},
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"published": "2025-04-16T20:18:31Z",
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"title": "GCN/AMON NOTICE",
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"revision": "1",
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"notice_date": "Wed 16 Apr 25 20:18:31 UT",
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},
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"published": "2025-04-16T20:18:31Z",
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"signalness": "3.4842e-01 [dn]",
"notice_date": "Wed 16 Apr 25 18:33:11 UT",
"notice_type": "ICECUBE Astrotrack Bronze",
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"discovery_date": "20781 TJD; 106 DOY; 25/04/16 (yy/mm/dd)",
"discovery_time": "66734 SOD {18:32:14.97} UT"
},
"message_text": "TITLE: GCN/AMON NOTICE\nNOTICE_DATE: Wed 16 Apr 25 18:33:11 UT\nNOTICE_TYPE: ICECUBE Astrotrack Bronze \nSTREAM: 25\nRUN_NUM: 140799\nEVENT_NUM: 37236133\nSRC_RA: 83.0910d {+05h 32m 22s} (J2000),\n 83.4537d {+05h 33m 49s} (current),\n 82.3743d {+05h 29m 30s} (1950)\nSRC_DEC: +15.4414d {+15d 26' 29\"} (J2000),\n +15.4579d {+15d 27' 28\"} (current),\n +15.4062d {+15d 24' 22\"} (1950)\nSRC_ERROR: 30.80 [arcmin radius, stat-only, 90% containment]\nSRC_ERROR50: 12.00 [arcmin radius, stat-only, 50% containment]\nDISCOVERY_DATE: 20781 TJD; 106 DOY; 25/04/16 (yy/mm/dd)\nDISCOVERY_TIME: 66734 SOD {18:32:14.97} UT\nREVISION: 0\nENERGY: 1.1447e+02 [TeV]\nSIGNALNESS: 3.4842e-01 [dn]\nFAR: 2.3036 [yr^-1]\nSUN_POSTN: 25.08d {+01h 40m 18s} +10.41d {+10d 24' 35\"}\nSUN_DIST: 56.96 [deg] Sun_angle= -3.9 [hr] (East of Sun)\nMOON_POSTN: 245.19d {+16h 20m 47s} -26.51d {-26d 30' 29\"}\nMOON_DIST: 159.72 [deg]\nGAL_COORDS: 189.90, -9.71 [deg] galactic lon,lat of the event\nECL_COORDS: 83.28, -7.84 [deg] ecliptic lon,lat of the event\nCOMMENTS: IceCube Bronze event. \nCOMMENTS: The position error is statistical only, there is no systematic added. \n",
"published": "2025-04-16T18:33:11Z",
"message_parser": "Icecube Notice Plaintext Parser v1",
"retracted": false,
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]
}
]
},
{
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"title": "GCN/AMON NOTICE",
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"authors": "",
"data": {
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"comments": "IceCube Bronze event.\nThe position error is statistical only, there is no systematic added.",
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"sun_postn": "29.68d {+01h 58m 43s} +12.11d {+12d 06' 50\"}",
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"gal_coords": "46.66, 47.96 [deg] galactic lon,lat of the event",
"moon_postn": "313.06d {+20h 52m 15s} -21.49d {-21d 29' 09\"}",
"signalness": "4.8073e-01 [dn]",
"notice_date": "Mon 21 Apr 25 17:07:01 UT",
"notice_type": "ICECUBE Astrotrack Bronze",
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"discovery_date": "20786 TJD; 111 DOY; 25/04/21 (yy/mm/dd)",
"discovery_time": "61568 SOD {17:06:08.07} UT"
},
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"moon_postn": "315.31d {+21h 01m 14s} -20.73d {-20d 43' 33\"}",
"signalness": "4.8073e-01 [dn]",
"notice_date": "Mon 21 Apr 25 21:07:41 UT",
"notice_type": "ICECUBE Astrotrack Bronze",
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"discovery_date": "20786 TJD; 111 DOY; 25/04/21 (yy/mm/dd)",
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},
"message_text": "TITLE: GCN/AMON NOTICE\nNOTICE_DATE: Mon 21 Apr 25 21:07:41 UT\nNOTICE_TYPE: ICECUBE Astrotrack Bronze \nSTREAM: 25\nRUN_NUM: 140824\nEVENT_NUM: 2517159\nSRC_RA: 240.9099d {+16h 03m 38s} (J2000),\n 241.1668d {+16h 04m 40s} (current),\n 240.4025d {+16h 01m 37s} (1950)\nSRC_DEC: +28.6700d {+28d 40' 12\"} (J2000),\n +28.6018d {+28d 36' 06\"} (current),\n +28.8064d {+28d 48' 23\"} (1950)\nSRC_ERROR: 157.20 [arcmin radius, stat-only, 90% containment]\nSRC_ERROR50: 75.60 [arcmin radius, stat-only, 50% containment]\nDISCOVERY_DATE: 20786 TJD; 111 DOY; 25/04/21 (yy/mm/dd)\nDISCOVERY_TIME: 61568 SOD {17:06:08.07} UT\nREVISION: 1\nENERGY: 1.5143e+02 [TeV]\nSIGNALNESS: 4.8073e-01 [dn]\nFAR: 1.0254 [yr^-1]\nSUN_POSTN: 29.84d {+01h 59m 21s} +12.17d {+12d 10' 12\"}\nSUN_DIST: 129.21 [deg] Sun_angle= 9.9 [hr] (West of Sun)\nMOON_POSTN: 315.31d {+21h 01m 14s} -20.73d {-20d 43' 33\"}\nMOON_DIST: 86.85 [deg]\nGAL_COORDS: 46.67, 47.80 [deg] galactic lon,lat of the event\nECL_COORDS: 230.23, 48.17 [deg] ecliptic lon,lat of the event\nCOMMENTS: IceCube Bronze event. \nCOMMENTS: The position error is statistical only, there is no systematic added. \n",
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},
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{
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"signalness": "4.8073e-01 [dn]",
"notice_date": "Mon 21 Apr 25 17:07:01 UT",
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"discovery_date": "20786 TJD; 111 DOY; 25/04/21 (yy/mm/dd)",
"discovery_time": "61568 SOD {17:06:08.07} UT"
},
"message_text": "TITLE: GCN/AMON NOTICE\nNOTICE_DATE: Mon 21 Apr 25 17:07:01 UT\nNOTICE_TYPE: ICECUBE Astrotrack Bronze \nSTREAM: 25\nRUN_NUM: 140824\nEVENT_NUM: 2517159\nSRC_RA: 240.7203d {+16h 02m 53s} (J2000),\n 240.9773d {+16h 03m 55s} (current),\n 240.2127d {+16h 00m 51s} (1950)\nSRC_DEC: +28.6896d {+28d 41' 23\"} (J2000),\n +28.6210d {+28d 37' 16\"} (current),\n +28.8268d {+28d 49' 37\"} (1950)\nSRC_ERROR: 77.49 [arcmin radius, stat-only, 90% containment]\nSRC_ERROR50: 30.19 [arcmin radius, stat-only, 50% containment]\nDISCOVERY_DATE: 20786 TJD; 111 DOY; 25/04/21 (yy/mm/dd)\nDISCOVERY_TIME: 61568 SOD {17:06:08.07} UT\nREVISION: 0\nENERGY: 1.5143e+02 [TeV]\nSIGNALNESS: 4.8073e-01 [dn]\nFAR: 1.0254 [yr^-1]\nSUN_POSTN: 29.68d {+01h 58m 43s} +12.11d {+12d 06' 50\"}\nSUN_DIST: 129.26 [deg] Sun_angle= 9.9 [hr] (West of Sun)\nMOON_POSTN: 313.06d {+20h 52m 15s} -21.49d {-21d 29' 09\"}\nMOON_DIST: 85.65 [deg]\nGAL_COORDS: 46.66, 47.96 [deg] galactic lon,lat of the event\nECL_COORDS: 229.99, 48.14 [deg] ecliptic lon,lat of the event\nCOMMENTS: IceCube Bronze event. \nCOMMENTS: The position error is statistical only, there is no systematic added. \n",
"published": "2025-04-21T17:07:01Z",
"message_parser": "Icecube Notice Plaintext Parser v1",
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"created": "2025-05-10T16:10:30.302315Z",
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},
{
"event_id": "140790_14362468",
"sequences": [
{
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"sequence_number": 0,
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"message": {
"id": 188846,
"topic": "gcn.classic.text.ICECUBE_CASCADE",
"uuid": "ffb1eb6c-1ad3-49ce-b8eb-f60991dc8228",
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"signalness": "9.0012e-01 [dn]",
"notice_date": "Mon 14 Apr 25 07:51:11 UT",
"notice_type": "ICECUBE Cascade",
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"discovery_date": "20779 TJD; 104 DOY; 25/04/14 (yy/mm/dd)",
"discovery_time": "28033 SOD {07:47:13.61} UT",
"skymap_png_url": "https://roc.icecube.wisc.edu/public/hese_cascades/hese_60779_run00140790.evt000014362468.png",
"skymap_fits_url": "https://roc.icecube.wisc.edu/public/hese_cascades/hese_60779_run00140790.evt000014362468.fits"
},
"message_text": "TITLE: GCN/AMON NOTICE\nNOTICE_DATE: Mon 14 Apr 25 07:51:11 UT\nNOTICE_TYPE: ICECUBE Cascade \nEVENT_NAME: IceCubeCascade-250414a\nSTREAM: 26\nRUN_NUM: 140790\nEVENT_NUM: 14362468\nSRC_RA: 157.9197d {+10h 31m 41s} (J2000),\n 158.2523d {+10h 33m 01s} (current),\n 157.2615d {+10h 29m 03s} (1950)\nSRC_DEC: +9.3545d {+09d 21' 16\"} (J2000),\n +9.2239d {+09d 13' 26\"} (current),\n +9.6119d {+09d 36' 43\"} (1950)\nSRC_ERROR: 6.82 [deg radius, stat+systematic, 90% containment]\nSRC_ERROR50: 3.74 [deg radius, stat+systematic, 50% containment]\nDISCOVERY_DATE: 20779 TJD; 104 DOY; 25/04/14 (yy/mm/dd)\nDISCOVERY_TIME: 28033 SOD {07:47:13.61} UT\nREVISION: 0\nENERGY: 100.02 [TeV]\nSIGNALNESS: 9.0012e-01 [dn]\nFAR: 0.3110 [yr^-1]\nSUN_POSTN: 22.81d {+01h 31m 15s} +9.54d {+09d 32' 22\"}\nSUN_DIST: 131.84 [deg] Sun_angle= -9.0 [hr] (East of Sun)\nMOON_POSTN: 215.21d {+14h 20m 51s} -17.72d {-17d 43' 19\"}\nMOON_DIST: 62.37 [deg]\nGAL_COORDS: 234.57, 52.56 [deg] galactic lon,lat of the event\nECL_COORDS: 156.11, 0.09 [deg] ecliptic lon,lat of the event\nSKYMAP_FITS_URL: https://roc.icecube.wisc.edu/public/hese_cascades/hese_60779_run00140790.evt000014362468.fits\nSKYMAP_PNG_URL: https://roc.icecube.wisc.edu/public/hese_cascades/hese_60779_run00140790.evt000014362468.png\nCOMMENTS: IceCube Cascade event. \nCOMMENTS: The position error is the combined statistical and the systematic. \n",
"published": "2025-04-14T07:51:11Z",
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}
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"title": "GCN/AMON NOTICE",
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"title": "GCN/AMON NOTICE",
"energy": "100.02 [TeV]",
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"revision": "0",
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"event_num": "14362468",
"moon_dist": "62.37 [deg]",
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"event_name": "IceCubeCascade-250414a",
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"moon_postn": "215.21d {+14h 20m 51s} -17.72d {-17d 43' 19\"}",
"signalness": "9.0012e-01 [dn]",
"notice_date": "Mon 14 Apr 25 07:51:11 UT",
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"src_error50": "3.74 [deg radius, stat+systematic, 50% containment]",
"discovery_date": "20779 TJD; 104 DOY; 25/04/14 (yy/mm/dd)",
"discovery_time": "28033 SOD {07:47:13.61} UT",
"skymap_png_url": "https://roc.icecube.wisc.edu/public/hese_cascades/hese_60779_run00140790.evt000014362468.png",
"skymap_fits_url": "https://roc.icecube.wisc.edu/public/hese_cascades/hese_60779_run00140790.evt000014362468.fits"
},
"message_text": "TITLE: GCN/AMON NOTICE\nNOTICE_DATE: Mon 14 Apr 25 07:51:11 UT\nNOTICE_TYPE: ICECUBE Cascade \nEVENT_NAME: IceCubeCascade-250414a\nSTREAM: 26\nRUN_NUM: 140790\nEVENT_NUM: 14362468\nSRC_RA: 157.9197d {+10h 31m 41s} (J2000),\n 158.2523d {+10h 33m 01s} (current),\n 157.2615d {+10h 29m 03s} (1950)\nSRC_DEC: +9.3545d {+09d 21' 16\"} (J2000),\n +9.2239d {+09d 13' 26\"} (current),\n +9.6119d {+09d 36' 43\"} (1950)\nSRC_ERROR: 6.82 [deg radius, stat+systematic, 90% containment]\nSRC_ERROR50: 3.74 [deg radius, stat+systematic, 50% containment]\nDISCOVERY_DATE: 20779 TJD; 104 DOY; 25/04/14 (yy/mm/dd)\nDISCOVERY_TIME: 28033 SOD {07:47:13.61} UT\nREVISION: 0\nENERGY: 100.02 [TeV]\nSIGNALNESS: 9.0012e-01 [dn]\nFAR: 0.3110 [yr^-1]\nSUN_POSTN: 22.81d {+01h 31m 15s} +9.54d {+09d 32' 22\"}\nSUN_DIST: 131.84 [deg] Sun_angle= -9.0 [hr] (East of Sun)\nMOON_POSTN: 215.21d {+14h 20m 51s} -17.72d {-17d 43' 19\"}\nMOON_DIST: 62.37 [deg]\nGAL_COORDS: 234.57, 52.56 [deg] galactic lon,lat of the event\nECL_COORDS: 156.11, 0.09 [deg] ecliptic lon,lat of the event\nSKYMAP_FITS_URL: https://roc.icecube.wisc.edu/public/hese_cascades/hese_60779_run00140790.evt000014362468.fits\nSKYMAP_PNG_URL: https://roc.icecube.wisc.edu/public/hese_cascades/hese_60779_run00140790.evt000014362468.png\nCOMMENTS: IceCube Cascade event. \nCOMMENTS: The position error is the combined statistical and the systematic. \n",
"published": "2025-04-14T07:51:11Z",
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"retracted": false,
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"sequence_number": 1,
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"message": {
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"title": "S250628au - PRELIMINARY",
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"data": {
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"time": "2025-06-28T23:30:10.330Z",
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"sequence_num": 1,
"time_created": "2025-06-28T23:30:40Z",
"superevent_id": "S250628au",
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},
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"published": "2025-06-28T23:30:41.356630Z",
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"topic": "igwn.gwalert",
"uuid": "1bb18b1e-a902-4431-a424-d8d14fb7f7f9",
"title": "S250628au - PRELIMINARY",
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"data": {
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"time": "2025-06-28T23:30:10.330Z",
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"time_created": "2025-06-28T23:35:14Z",
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"published": "2025-06-28T23:35:15.376098Z",
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"created": "2025-06-28T23:35:15.376117Z",
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{
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"sequence_number": 0,
"sequence_type": "INITIAL",
"message": {
"id": 189774,
"topic": "gcn.classic.text.ICECUBE_ASTROTRACK_BRONZE",
"uuid": "e06b7c7f-49a3-4a2a-906a-64852f937f79",
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"submitter": "",
"authors": "",
"data": {
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"urls": {
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"title": "GCN/AMON NOTICE",
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"comments": "IceCube Bronze event.\nThe position error is statistical only, there is no systematic added.",
"revision": "0",
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"event_num": "52432631",
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"gal_coords": "57.36, -1.83 [deg] galactic lon,lat of the event",
"moon_postn": "19.18d {+01h 16m 43s} +10.49d {+10d 29' 41\"}",
"signalness": "3.6116e-01 [dn]",
"notice_date": "Sat 26 Apr 25 17:45:51 UT",
"notice_type": "ICECUBE Astrotrack Bronze",
"src_error50": "13.05 [arcmin radius, stat-only, 50% containment]",
"discovery_date": "20791 TJD; 116 DOY; 25/04/26 (yy/mm/dd)",
"discovery_time": "63898 SOD {17:44:58.16} UT"
},
"message_text": "TITLE: GCN/AMON NOTICE\nNOTICE_DATE: Sat 26 Apr 25 17:45:51 UT\nNOTICE_TYPE: ICECUBE Astrotrack Bronze \nSTREAM: 25\nRUN_NUM: 140843\nEVENT_NUM: 52432631\nSRC_RA: 296.2668d {+19h 45m 04s} (J2000),\n 296.5434d {+19h 46m 10s} (current),\n 295.7205d {+19h 42m 53s} (1950)\nSRC_DEC: +20.6912d {+20d 41' 28\"} (J2000),\n +20.7539d {+20d 45' 14\"} (current),\n +20.5692d {+20d 34' 09\"} (1950)\nSRC_ERROR: 33.50 [arcmin radius, stat-only, 90% containment]\nSRC_ERROR50: 13.05 [arcmin radius, stat-only, 50% containment]\nDISCOVERY_DATE: 20791 TJD; 116 DOY; 25/04/26 (yy/mm/dd)\nDISCOVERY_TIME: 63898 SOD {17:44:58.16} UT\nREVISION: 0\nENERGY: 1.1194e+02 [TeV]\nSIGNALNESS: 3.6116e-01 [dn]\nFAR: 2.2610 [yr^-1]\nSUN_POSTN: 34.41d {+02h 17m 39s} +13.76d {+13d 45' 52\"}\nSUN_DIST: 92.29 [deg] Sun_angle= 6.5 [hr] (West of Sun)\nMOON_POSTN: 19.18d {+01h 16m 43s} +10.49d {+10d 29' 41\"}\nMOON_DIST: 79.49 [deg]\nGAL_COORDS: 57.36, -1.83 [deg] galactic lon,lat of the event\nECL_COORDS: 303.35, 41.14 [deg] ecliptic lon,lat of the event\nCOMMENTS: IceCube Bronze event. \nCOMMENTS: The position error is statistical only, there is no systematic added. \n",
"published": "2025-04-26T17:45:51Z",
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"created": "2025-05-10T16:11:26.447488Z",
"modified": "2025-05-10T16:11:26.451494Z"
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{
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"message": {
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"uuid": "40f42690-7b98-4ee6-ba7c-fa8dcd60e922",
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"title": "GCN/AMON NOTICE",
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"stream": "25",
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"comments": "IceCube Bronze event.\nThe position error is statistical only, there is no systematic added.",
"revision": "1",
"sun_dist": "92.24 [deg] Sun_angle= 6.5 [hr] (West of Sun)",
"event_num": "52432631",
"moon_dist": "80.07 [deg]",
"src_error": "31.04 [arcmin radius, stat-only, 90% containment]",
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"gal_coords": "57.42, -1.91 [deg] galactic lon,lat of the event",
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"signalness": "3.6116e-01 [dn]",
"notice_date": "Sat 26 Apr 25 19:18:21 UT",
"notice_type": "ICECUBE Astrotrack Bronze",
"src_error50": "16.94 [arcmin radius, stat-only, 50% containment]",
"discovery_date": "20791 TJD; 116 DOY; 25/04/26 (yy/mm/dd)",
"discovery_time": "63898 SOD {17:44:58.16} UT"
},
"message_text": "TITLE: GCN/AMON NOTICE\nNOTICE_DATE: Sat 26 Apr 25 19:18:21 UT\nNOTICE_TYPE: ICECUBE Astrotrack Bronze \nSTREAM: 25\nRUN_NUM: 140843\nEVENT_NUM: 52432631\nSRC_RA: 296.3700d {+19h 45m 29s} (J2000),\n 296.6467d {+19h 46m 35s} (current),\n 295.8236d {+19h 43m 18s} (1950)\nSRC_DEC: +20.6999d {+20d 41' 60\"} (J2000),\n +20.7628d {+20d 45' 46\"} (current),\n +20.5774d {+20d 34' 39\"} (1950)\nSRC_ERROR: 31.04 [arcmin radius, stat-only, 90% containment]\nSRC_ERROR50: 16.94 [arcmin radius, stat-only, 50% containment]\nDISCOVERY_DATE: 20791 TJD; 116 DOY; 25/04/26 (yy/mm/dd)\nDISCOVERY_TIME: 63898 SOD {17:44:58.16} UT\nREVISION: 1\nENERGY: 1.1194e+02 [TeV]\nSIGNALNESS: 3.6116e-01 [dn]\nFAR: 2.2610 [yr^-1]\nSUN_POSTN: 34.47d {+02h 17m 53s} +13.79d {+13d 47' 06\"}\nSUN_DIST: 92.24 [deg] Sun_angle= 6.5 [hr] (West of Sun)\nMOON_POSTN: 20.07d {+01h 20m 16s} +10.93d {+10d 55' 48\"}\nMOON_DIST: 80.07 [deg]\nGAL_COORDS: 57.42, -1.91 [deg] galactic lon,lat of the event\nECL_COORDS: 303.47, 41.12 [deg] ecliptic lon,lat of the event\nCOMMENTS: IceCube Bronze event. \nCOMMENTS: The position error is statistical only, there is no systematic added. \n",
"published": "2025-04-26T19:18:21Z",
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"retracted": false,
"created": "2025-05-10T16:11:26.500512Z",
"modified": "2025-05-10T16:11:26.505969Z"
}
}
],
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"topic": "gcn.classic.text.ICECUBE_ASTROTRACK_BRONZE",
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"title": "GCN/AMON NOTICE",
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"title": "GCN/AMON NOTICE",
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"event_num": "52432631",
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"moon_postn": "20.07d {+01h 20m 16s} +10.93d {+10d 55' 48\"}",
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"notice_date": "Sat 26 Apr 25 19:18:21 UT",
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"discovery_date": "20791 TJD; 116 DOY; 25/04/26 (yy/mm/dd)",
"discovery_time": "63898 SOD {17:44:58.16} UT"
},
"message_text": "TITLE: GCN/AMON NOTICE\nNOTICE_DATE: Sat 26 Apr 25 19:18:21 UT\nNOTICE_TYPE: ICECUBE Astrotrack Bronze \nSTREAM: 25\nRUN_NUM: 140843\nEVENT_NUM: 52432631\nSRC_RA: 296.3700d {+19h 45m 29s} (J2000),\n 296.6467d {+19h 46m 35s} (current),\n 295.8236d {+19h 43m 18s} (1950)\nSRC_DEC: +20.6999d {+20d 41' 60\"} (J2000),\n +20.7628d {+20d 45' 46\"} (current),\n +20.5774d {+20d 34' 39\"} (1950)\nSRC_ERROR: 31.04 [arcmin radius, stat-only, 90% containment]\nSRC_ERROR50: 16.94 [arcmin radius, stat-only, 50% containment]\nDISCOVERY_DATE: 20791 TJD; 116 DOY; 25/04/26 (yy/mm/dd)\nDISCOVERY_TIME: 63898 SOD {17:44:58.16} UT\nREVISION: 1\nENERGY: 1.1194e+02 [TeV]\nSIGNALNESS: 3.6116e-01 [dn]\nFAR: 2.2610 [yr^-1]\nSUN_POSTN: 34.47d {+02h 17m 53s} +13.79d {+13d 47' 06\"}\nSUN_DIST: 92.24 [deg] Sun_angle= 6.5 [hr] (West of Sun)\nMOON_POSTN: 20.07d {+01h 20m 16s} +10.93d {+10d 55' 48\"}\nMOON_DIST: 80.07 [deg]\nGAL_COORDS: 57.42, -1.91 [deg] galactic lon,lat of the event\nECL_COORDS: 303.47, 41.12 [deg] ecliptic lon,lat of the event\nCOMMENTS: IceCube Bronze event. \nCOMMENTS: The position error is statistical only, there is no systematic added. \n",
"published": "2025-04-26T19:18:21Z",
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{
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"moon_postn": "19.18d {+01h 16m 43s} +10.49d {+10d 29' 41\"}",
"signalness": "3.6116e-01 [dn]",
"notice_date": "Sat 26 Apr 25 17:45:51 UT",
"notice_type": "ICECUBE Astrotrack Bronze",
"src_error50": "13.05 [arcmin radius, stat-only, 50% containment]",
"discovery_date": "20791 TJD; 116 DOY; 25/04/26 (yy/mm/dd)",
"discovery_time": "63898 SOD {17:44:58.16} UT"
},
"message_text": "TITLE: GCN/AMON NOTICE\nNOTICE_DATE: Sat 26 Apr 25 17:45:51 UT\nNOTICE_TYPE: ICECUBE Astrotrack Bronze \nSTREAM: 25\nRUN_NUM: 140843\nEVENT_NUM: 52432631\nSRC_RA: 296.2668d {+19h 45m 04s} (J2000),\n 296.5434d {+19h 46m 10s} (current),\n 295.7205d {+19h 42m 53s} (1950)\nSRC_DEC: +20.6912d {+20d 41' 28\"} (J2000),\n +20.7539d {+20d 45' 14\"} (current),\n +20.5692d {+20d 34' 09\"} (1950)\nSRC_ERROR: 33.50 [arcmin radius, stat-only, 90% containment]\nSRC_ERROR50: 13.05 [arcmin radius, stat-only, 50% containment]\nDISCOVERY_DATE: 20791 TJD; 116 DOY; 25/04/26 (yy/mm/dd)\nDISCOVERY_TIME: 63898 SOD {17:44:58.16} UT\nREVISION: 0\nENERGY: 1.1194e+02 [TeV]\nSIGNALNESS: 3.6116e-01 [dn]\nFAR: 2.2610 [yr^-1]\nSUN_POSTN: 34.41d {+02h 17m 39s} +13.76d {+13d 45' 52\"}\nSUN_DIST: 92.29 [deg] Sun_angle= 6.5 [hr] (West of Sun)\nMOON_POSTN: 19.18d {+01h 16m 43s} +10.49d {+10d 29' 41\"}\nMOON_DIST: 79.49 [deg]\nGAL_COORDS: 57.36, -1.83 [deg] galactic lon,lat of the event\nECL_COORDS: 303.35, 41.14 [deg] ecliptic lon,lat of the event\nCOMMENTS: IceCube Bronze event. \nCOMMENTS: The position error is statistical only, there is no systematic added. \n",
"published": "2025-04-26T17:45:51Z",
"message_parser": "Icecube Notice Plaintext Parser v1",
"retracted": false,
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}
]
},
{
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{
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