TITLE: GCN CIRCULAR
NUMBER: 36738
SUBJECT: LIGO/Virgo/KAGRA S240622h: Updated Sky localization and Source Classification
DATE: 24/06/22 20:13:54 GMT
FROM: Michael J. Williams at University of Portsmouth <michael.williams(a)ligo.org>
The LIGO Scientific Collaboration, the Virgo Collaboration, and the KAGRA Collaboration report:
We 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 S240622h (GCN Circular 36730). 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:
https://gracedb.ligo.org/superevents/S240622h
After parameter estimation by RapidPE-RIFT [2], the updated classification of the GW signal, in order of descending probability, is BBH (99%), Terrestrial (1%), NSBH (<1%), or BNS (<1%).
For the Bilby.multiorder.fits,0 sky map, the 90% credible region is 199 deg2. Marginalized over the whole sky, the a posteriori luminosity distance estimate is 1350 +/- 303 Mpc (a posteriori mean +/- standard deviation).
For 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/.
[1] Ashton et al. ApJS 241, 27 (2019) doi:10.3847/1538-4365/ab06fc and Morisaki et al. (2023) arXiv:2307.13380
[2] Rose et al. (2022) arXiv:2201.05263 and Pankow et al. PRD 92, 023002 (2015) doi:10.1103/PhysRevD.92.023002
View this GCN Circular online at https://gcn.nasa.gov/circulars/36738.
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TITLE: GCN CIRCULAR
NUMBER: 36737
SUBJECT: Fermi trigger No 740744838: Global MASTER-Net observations report
DATE: 24/06/22 19:31:02 GMT
FROM: Vladimir Lipunov at Moscow State U/Krylov Obs <lipunov(a)xray.sai.msu.ru>
V. Lipunov, V.Kornilov, E. Gorbovskoy, K. Zhirkov, N.Tyurina, P.Balanutsa, A.Kuznetsov, V.Senik, D. Vlasenko,
G.Antipov, D.Zimnukhov, E.Minkina, A.Chasovnikov, V.Topolev, D.Kuvshinov, D. Cheryasov, Ya.Kechin, Yu.Tselik, A. Sosnovskij
(Lomonosov Moscow State University, SAI, Physics Department),
R. Podesta, C.Lopez, F. Podesta, C.Francile
(Observatorio Astronomico Felix Aguilar OAFA),
R. Rebolo, M. Serra
(The Instituto de Astrofisica de Canarias),
D. Buckley
(South African Astronomical Observatory),
O.A. Gress, N.M. Budnev, O.Ershova
(Irkutsk State University, API),
L.Carrasco, J.R.Valdes, V.Chavushyan, V.M.Patino Alvarez, J.Martinez,
A.R.Corella, L.H.Rodriguez
(INAOE, Guillermo Haro Astrophysics Observatory),
A. Tlatov, D. Dormidontov
(Kislovodsk Solar Station of the Pulkovo Observatory),
V. Yurkov, A. Gabovich
(Blagoveschensk Educational State University)
MASTER-Tavrida robotic telescope (Global MASTER-Net: http://observ.pereplet.ru, Lipunov et al., 2010, Advances in Astronomy, vol. 2010, 30L) located in Russia (Lomonosov MSU, SAI Crimea astronomical station) started inspect of the Fermi GRB240622.44 (trigger No 740744838,09h 39m 07.92s , +74d 46m 01.2s, R=35.72) errorbox 29252 sec after notice time and 29284 sec after trigger time at 2024-06-22 18:35:17 UT, with upper limit up to 15.7 mag. Observations started at twilight. The observations began at zenith distance = 75 deg. The sun altitude is -9.8 deg.
MASTER-Kislovodsk robotic telescope located in Russia (Lomonosov MSU, Kislovodsk Solar Station of Pulkovo observatory) started inspect of the Fermi GRB240622.44 errorbox 30316 sec after notice time and 30348 sec after trigger time at 2024-06-22 18:53:02 UT, with upper limit up to 16.6 mag. Observations started at twilight. The observations began at zenith distance = 81 deg. The sun altitude is -16.2 deg.
The galactic latitude b = 37 deg., longitude l = 137 deg.
Real time updated cover map and OT discovered available here:
https://master.sai.msu.ru/site/master2/observ.php?id=2503268
We obtain a following upper limits.
Tmid-T0 | Date Time | Site | Coord (J2000) |Filt.| Expt. | Limit| Comment
_________|_____________________|_____________________|____________________________________|_____|_______|_______|________
29314 | 2024-06-22 18:35:17 | MASTER-Tavrida | (02h 37m 42.72s , +60d 36m 40.0s) | C | 60 | 13.8 |
30003 | 2024-06-22 18:46:46 | MASTER-Tavrida | (03h 43m 04.34s , +55d 36m 54.3s) | C | 60 | 14.2 |
30103 | 2024-06-22 18:48:26 | MASTER-Tavrida | (02h 37m 38.22s , +60d 38m 07.0s) | C | 60 | 14.8 |
30103 | 2024-06-22 18:48:26 | MASTER-Tavrida | (02h 37m 46.34s , +60d 34m 19.3s) | C | 60 | 15.4 |
30201 | 2024-06-22 18:50:04 | MASTER-Tavrida | (02h 54m 10.92s , +60d 42m 42.9s) | C | 60 | 14.7 |
30201 | 2024-06-22 18:50:04 | MASTER-Tavrida | (02h 53m 53.36s , +60d 47m 24.2s) | C | 60 | 14.8 |
30379 | 2024-06-22 18:53:02 | MASTER-Kislovodsk | (03h 46m 17.11s , +56d 07m 27.5s) | C | 60 | 16.6 |
31280 | 2024-06-22 19:08:03 | MASTER-Tavrida | (03h 43m 14.23s , +55d 27m 38.2s) | C | 60 | 13.3 |
31280 | 2024-06-22 19:08:03 | MASTER-Tavrida | (03h 43m 24.91s , +55d 23m 54.7s) | C | 60 | 14.2 |
31376 | 2024-06-22 19:09:39 | MASTER-Tavrida | (02h 54m 07.26s , +60d 41m 39.2s) | C | 60 | 15.7 |
31376 | 2024-06-22 19:09:39 | MASTER-Tavrida | (02h 53m 51.84s , +60d 46m 50.7s) | C | 60 | 15.3 |
Filter C is a clear (unfiltred) band.
The observation and reduction will continue.
The message may be cited.
View this GCN Circular online at https://gcn.nasa.gov/circulars/36737.
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TITLE: GCN CIRCULAR
NUMBER: 36736
SUBJECT: EP240618a: NOT optical counterpart candidate
DATE: 24/06/22 18:53:13 GMT
FROM: Dong Xu at NAOC/CAS <dxu(a)nao.cas.cn>
X. Liu, S.Y. Fu, J. An, Z.P. Zhu, S.Q. Jiang, D. Xu (NAOC), J. Terwel (NOT) report on behalf of a large collaboration:
We observed the field of EP240618a detected by EP/WXT (Sun et al., GCN 36690) using the the 2.56-m Nordic Optical Telescope (NOT) equipped with the ALFOSC camera. Observations started at 00:07:28 UT on 2024-06-20, i.e., ~ 1.77 day after the EP trigger, and 12x120 s Sloan z-filter images were obtained.
An uncatalogued optical transient (OT), within the 30 arcsec EP/FXT error circle (Sun et al., GCN 36690), is detected in the stacked z-band image at coordinates:
R.A. (J2000)= 18:46:35.78
Dec. (J2000)= +23:50:13.17
with an uncertainty of ~ 0.2 arcsec. The OT is 1.3 arcsec away from a nearby 18.4 magnitude star, and its preliminary photometry is z ~ 21 mag at 1.78 day since the EP trigger, calibrated against nearby Pan-STARRS stars and not corrected for Galactic extinction.
The OT is not detected by early TRT observation (Tinyanont et al., GCN 36710) down to R ~ 20.3 mag, and not by LCO observation (Li et al., GCN 36731) down to r ~ 21.5 mag.
If EP240618a is a GRB, the z-r color might indicate high redshift.
A finding chart of the candidate is available at
https://drive.google.com/file/d/1pPAKrFyVvk3D7QnpgCfBQHim1ieGQ8zq/view?usp=…
A second epoch in z-band at the NOT has been scheduled for the night of June 22.
View this GCN Circular online at https://gcn.nasa.gov/circulars/36736.
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TITLE: GCN CIRCULAR
NUMBER: 36735
SUBJECT: LIGO/Virgo/KAGRA S240621em: Updated Sky localization and Source Classification
DATE: 24/06/22 14:26:04 GMT
FROM: Nihar.Gupte(a)aei.mpg.de
The LIGO Scientific Collaboration, the Virgo Collaboration, and the KAGRA Collaboration report:
We 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 S240621em (GCN Circular 36729). Parameter estimation has been performed using Bilby [1] and a new sky map, Bilby.offline0.multiorder.fits, distributed via GCN Notice, is available for retrieval from the GraceDB event page:
https://gracedb.ligo.org/superevents/S240621em
After parameter estimation by RapidPE-RIFT [2], the updated classification of the GW signal, in order of descending probability, is BBH (96%), Terrestrial (4%), NSBH (<1%), or BNS (<1%).
For the Bilby.offline0.multiorder.fits sky map, the 90% credible region is 3069 deg2. Marginalized over the whole sky, the a posteriori luminosity distance estimate is 7458 +/- 2672 Mpc (a posteriori mean +/- standard deviation).
For 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/.
[1] Ashton et al. ApJS 241, 27 (2019) doi:10.3847/1538-4365/ab06fc and Morisaki et al. (2023) arXiv:2307.13380
[2] Rose et al. (2022) arXiv:2201.05263 and Pankow et al. PRD 92, 023002 (2015) doi:10.1103/PhysRevD.92.023002
View this GCN Circular online at https://gcn.nasa.gov/circulars/36735.
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TITLE: GCN CIRCULAR
NUMBER: 36734
SUBJECT: GRB 240529A: JinShan optical observations
DATE: 24/06/22 14:23:13 GMT
FROM: Dong Xu at NAOC/CAS <dxu(a)nao.cas.cn>
J. An, X. Liu, Z.P. Zhu, S.Q. Jiang, S.Y. Fu, T.H. Lu, D. Xu (NAOC), J.Z. Liu (XAO) report on behalf of a large collaboration:
We observed the field of GRB 240529A by Swift (Eyles-Ferris et al. GCN 36556) using the 50cm-B, 50cm-C, 100cm-C telescopes (50B,50C,100C) of the JinShan project located at Altay, Xinjiang, China.
Observations were carried out between 16:14:18 UT and 17:55:39 UT on 2024-05-29 in the g, r, i, and z filters. The previously reported optical afterglow, e.g., by Swift/UVOT (Eyles-Ferris et al. GCN 36556; Shilling et al., GCN 36562) was clearly detected in our images.
Photometric results are reported as follows
T-T0(d) | Filter | Mag | MagErr
---------------------------------
0.5639 | g | 19.76 | 0.18
0.5691 | r | 18.56 | 0.06
0.5639 | i | 17.80 | 0.05
0.6037 | z | 17.65 | 0.06
calibrated with nearby PanSTARRS stars and not corrected for Galactic extinction.
Furthers observations have also been done by JinShan.
We acknowledge the excellent support from S.W Luo, M.M. Yang, Z. K. Feng, and L.F. Huo for enabling these observations.
View this GCN Circular online at https://gcn.nasa.gov/circulars/36734.
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TITLE: GCN CIRCULAR
NUMBER: 36733
SUBJECT: LIGO/Virgo/KAGRA S240621dy: Updated Sky localization and Source Classification
DATE: 24/06/22 12:07:22 GMT
FROM: Nihar.Gupte(a)aei.mpg.de
The LIGO Scientific Collaboration, the Virgo Collaboration, and the KAGRA Collaboration report:
We 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 S240621dy (GCN Circular 36727). 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:
https://gracedb.ligo.org/superevents/S240621dy
After parameter estimation by RapidPE-RIFT [2], the updated classification of the GW signal, in order of descending probability, is BBH (>99%), NSBH (<1%), BNS (<1%), or Terrestrial (<1%).
For the Bilby.multiorder.fits,0 sky map, the 90% credible region is well fit by an ellipse with an area of 22 deg2 described by the following DS9 region (right ascension, declination, semi-major axis, semi-minor axis, position angle of the semi-minor axis): icrs; ellipse(03h12m, +45d20m, 3.53d, 1.95d, 105.53d)
Marginalized over the whole sky, the a posteriori luminosity distance estimate is 1184 +/- 199 Mpc (a posteriori mean +/- standard deviation).
For 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/.
[1] Ashton et al. ApJS 241, 27 (2019) doi:10.3847/1538-4365/ab06fc and Morisaki et al. (2023) arXiv:2307.13380
[2] Rose et al. (2022) arXiv:2201.05263 and Pankow et al. PRD 92, 023002 (2015) doi:10.1103/PhysRevD.92.023002
View this GCN Circular online at https://gcn.nasa.gov/circulars/36733.
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TITLE: GCN CIRCULAR
NUMBER: 36732
SUBJECT: LIGO/Virgo/KAGRA S240621eb: Updated Sky localization and Source Classification
DATE: 24/06/22 11:11:54 GMT
FROM: Michael J. Williams at University of Portsmouth <michael.williams(a)ligo.org>
The LIGO Scientific Collaboration, the Virgo Collaboration, and the KAGRA Collaboration report:
We 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 S240621eb (GCN Circular 36728). 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:
https://gracedb.ligo.org/superevents/S240621eb
After parameter estimation by RapidPE-RIFT [2], the updated classification of the GW signal, in order of descending probability, is BBH (>99%), Terrestrial (<1%), NSBH (<1%), or BNS (<1%).
For the Bilby.multiorder.fits,0 sky map, the 90% credible region is 920 deg2. Marginalized over the whole sky, the a posteriori luminosity distance estimate is 4492 +/- 1407 Mpc (a posteriori mean +/- standard deviation).
For 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/.
[1] Ashton et al. ApJS 241, 27 (2019) doi:10.3847/1538-4365/ab06fc and Morisaki et al. (2023) arXiv:2307.13380
[2] Rose et al. (2022) arXiv:2201.05263 and Pankow et al. PRD 92, 023002 (2015) doi:10.1103/PhysRevD.92.023002
View this GCN Circular online at https://gcn.nasa.gov/circulars/36732.
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TITLE: GCN CIRCULAR
NUMBER: 36731
SUBJECT: EP240618a: GSP optical upper limit
DATE: 24/06/22 09:48:46 GMT
FROM: Wenxiong Li <liwenxiong1992(a)gmail.com>
W. X. Li, S. J. Xue, (NAOC), M. Andrews, J. Farrah, D. A. Howell, M. Newsome, E. Padilla Gonzalez, C. McCully, and G. Terreran (Las Cumbres Observatory), on behalf of a larger collaboration, report:
Following the detection of the fast X-ray transient EP240618a by the Einstein Probe (Sun et al., GCN 36690), we initiated observations of the fast X-ray transient location starting on June 18 at 7:43 UT (~2 hours after the trigger) in the r band. These observations were conducted using the 1-meter telescope at the Las Cumbres Observatory node located at McDonald Observatory in USA.
No new optical source was detected in the co-added images within the EP/FXT error box down to ~21.5 mag.
These observations were taken as part of the Global Supernova Project.
View this GCN Circular online at https://gcn.nasa.gov/circulars/36731.
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TITLE: GCN CIRCULAR
NUMBER: 36730
SUBJECT: LIGO/Virgo/KAGRA S240622h: Identification of a GW compact binary merger candidate
DATE: 24/06/22 01:17:58 GMT
FROM: Surojit Saha at Institute of Astronomy, National Tsing Hua University <surojitsaha(a)gapp.nthu.edu.tw>
The LIGO Scientific Collaboration, the Virgo Collaboration, and the KAGRA Collaboration report:
We identified the compact binary merger candidate S240622h during real-time processing of data from LIGO Hanford Observatory (H1), LIGO Livingston Observatory (L1), and Virgo Observatory (V1) at 2024-06-22 00:40:08.415 UTC (GPS time: 1403052026.415). The candidate was found by the CWB [1], GstLAL [2], MBTA [3], and PyCBC Live [4] analysis pipelines.
S240622h is an event of interest because its false alarm rate, as estimated by the online analysis, is 1.2e-08 Hz, or about one in 2 years. The event's properties can be found at this URL:
https://gracedb.ligo.org/superevents/S240622h
The classification of the GW signal, in order of descending probability, is BBH (99%), Terrestrial (1%), BNS (<1%), or NSBH (<1%).
Assuming the candidate is astrophysical in origin, the probability that the lighter compact object is consistent with a neutron star mass (HasNS) is <1%. [5] Using the masses and spins inferred from the signal, the probability of matter outside the final compact object (HasRemnant) is <1%. [5] Both HasNS and HasRemnant consider the support of several neutron star equations of state. The probability that either of the binary components lies between 3 and 5 solar masses (HasMassGap) is 1%.
Two sky maps are available at this time and can be retrieved from the GraceDB event page:
* bayestar.multiorder.fits,1, an initial localization generated by BAYESTAR [6], distributed via GCN notice about 31 seconds after the candidate event time.
* bayestar.multiorder.fits,2, an initial localization generated by BAYESTAR [6], distributed via GCN notice about 5 minutes after the candidate event time.
The preferred sky map at this time is bayestar.multiorder.fits,2. For the bayestar.multiorder.fits,2 sky map, the 90% credible region is 271 deg2. Marginalized over the whole sky, the a posteriori luminosity distance estimate is 1655 +/- 399 Mpc (a posteriori mean +/- standard deviation).
For 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/.
[1] Klimenko et al. PRD 93, 042004 (2016) doi:10.1103/PhysRevD.93.042004
[2] Tsukada et al. PRD 108, 043004 (2023) doi:10.1103/PhysRevD.108.043004 and Ewing et al. (2023) arXiv:2305.05625
[3] Aubin et al. CQG 38, 095004 (2021) doi:10.1088/1361-6382/abe913
[4] Dal Canton et al. ApJ 923, 254 (2021) doi:10.3847/1538-4357/ac2f9a
[5] Chatterjee et al. ApJ 896, 54 (2020) doi:10.3847/1538-4357/ab8dbe
[6] Singer & Price PRD 93, 024013 (2016) doi:10.1103/PhysRevD.93.024013
View this GCN Circular online at https://gcn.nasa.gov/circulars/36730.
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TITLE: GCN CIRCULAR
NUMBER: 36729
SUBJECT: LIGO/Virgo/KAGRA S240621em: Identification of a GW compact binary merger candidate
DATE: 24/06/21 22:12:18 GMT
FROM: hsiang-yu.huang(a)ligo.org
The LIGO Scientific Collaboration, the Virgo Collaboration, and the KAGRA Collaboration report:
We identified the compact binary merger candidate S240621em during real-time processing of data from LIGO Hanford Observatory (H1), LIGO Livingston Observatory (L1), and Virgo Observatory (V1) at 2024-06-21 21:40:41.721 UTC (GPS time: 1403041259.721). The candidate was found by the CWB [1], GstLAL [2], and MBTA [3] analysis pipelines.
S240621em is an event of interest because its false alarm rate, as estimated by the online analysis, is 6.8e-08 Hz, or about one in 5 months. The event's properties can be found at this URL:
https://gracedb.ligo.org/superevents/S240621em
The classification of the GW signal, in order of descending probability, is BBH (96%), Terrestrial (4%), NSBH (<1%), or BNS (<1%).
Assuming the candidate is astrophysical in origin, the probability that the lighter compact object is consistent with a neutron star mass (HasNS) is <1%. [4] Using the masses and spins inferred from the signal, the probability of matter outside the final compact object (HasRemnant) is <1%. [4] Both HasNS and HasRemnant consider the support of several neutron star equations of state. The probability that either of the binary components lies between 3 and 5 solar masses (HasMassGap) is 4%.
Two sky maps are available at this time and can be retrieved from the GraceDB event page:
* bayestar.multiorder.fits,1, an initial localization generated by BAYESTAR [5], distributed via GCN notice about 28 seconds after the candidate event time.
* bayestar.multiorder.fits,2, an initial localization generated by BAYESTAR [5], distributed via GCN notice about 5 minutes after the candidate event time.
The preferred sky map at this time is bayestar.multiorder.fits,2. For the bayestar.multiorder.fits,2 sky map, the 90% credible region is 3223 deg2. Marginalized over the whole sky, the a posteriori luminosity distance estimate is 8682 +/- 2510 Mpc (a posteriori mean +/- standard deviation).
For 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/.
[1] Klimenko et al. PRD 93, 042004 (2016) doi:10.1103/PhysRevD.93.042004
[2] Tsukada et al. PRD 108, 043004 (2023) doi:10.1103/PhysRevD.108.043004 and Ewing et al. (2023) arXiv:2305.05625
[3] Aubin et al. CQG 38, 095004 (2021) doi:10.1088/1361-6382/abe913
[4] Chatterjee et al. ApJ 896, 54 (2020) doi:10.3847/1538-4357/ab8dbe
[5] Singer & Price PRD 93, 024013 (2016) doi:10.1103/PhysRevD.93.024013
View this GCN Circular online at https://gcn.nasa.gov/circulars/36729.
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