June 2024 - vsnet-grb-info - ooruri.kusastro.kyoto-u.ac.jp

[vsnet-grb-info 34627] GRB 240627A: NuSTAR Detection of the long GRB
by GCN Circulars 28 Jun '24

28 Jun '24

TITLE: GCN CIRCULAR NUMBER: 36778 SUBJECT: GRB 240627A: NuSTAR Detection of the long GRB DATE: 24/06/28 16:44:53 GMT FROM: Brian Grefenstette at Caltech/NuSTAR <bwgref(a)srl.caltech.edu> B. Grefenstette (Caltech) reports on behalf of the NuSTAR Search for INteresting Gamma-ray Signals (SINGS) working group: The NuSTAR SINGS working group reports the detection of prompt emission from the Long GRB 240627A in both the NuSTAR CsI anti-coincidence shields. The NuSTAR CsI shield data … [View More]

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[vsnet-grb-info 34626] GRB 240615A: SAI CMO J- band observations
by GCN Circulars 28 Jun '24

28 Jun '24

TITLE: GCN CIRCULAR NUMBER: 36777 SUBJECT: GRB 240615A: SAI CMO J- band observations DATE: 24/06/28 12:50:00 GMT FROM: Alexei Pozanenko at IKI, Moscow <grb.alex(a)gmail.com> A. Volnova (IKI), A.A. Tatarnikov (SAI MSU), A.M. Tatarnikov (SAI MSU), N. Pankov (HSE, IKI), A. Pozanenko (IKI), S. Belkin (IKI, HSE) report on behalf of GRB-IKI-FuN: We observed the field of GRB 240615A (Fermi GBM team, GCN 36671; DeLaunay et al, GCN 36672; Evans, GCN 36673; Frederiks et al, GCN 36677; … [View More]

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[vsnet-grb-info 34625] GRB 240627A: AstroSat CZTI detection
by GCN Circulars 28 Jun '24

28 Jun '24

TITLE: GCN CIRCULAR NUMBER: 36776 SUBJECT: GRB 240627A: AstroSat CZTI detection DATE: 24/06/28 05:56:16 GMT FROM: Gaurav Waratkar at IIT Bombay <gauravwaratkar(a)iitb.ac.in> J. Joshi (IUCAA), G. Waratkar (IITB), A. Vibhute (IUCAA), V. Bhalerao (IITB), D. Bhattacharya (Ashoka University/IUCAA), A. R. Rao (IUCAA/TIFR), and S. Vadawale (PRL) report on behalf of the AstroSat CZTI collaboration: Analysis of AstroSat CZTI data with the CIFT framework (Sharma et al., 2021, JApA, 42, … [View More]73) showed the detection of a long-duration GRB 240627A. Inspection of INTEGRAL/SPI-ACS data also showed the detection of the burst. We also note that this trigger is ~13 min after a solar flare in NASA/GOES X-ray flux data. While we cannot accurately localize this GRB because of low counts in our detectors, the relative intensities in different quadrants of CZT and Veto detectors indicate a different source direction. The source was clearly detected in the CZT detectors in the 20-200 keV energy range. The light curve showed multiple peaks of emission with the strongest peak at 2024-06-27 23:59:01.50 UTC. The measured peak count rate associated with the burst is 502 (+47, -44) counts/s above the background in the combined data of all quadrants, with a total of 2665 (+211, -223) counts. We caution that there is a 0.3 s readout dead time in CZT data during the burst which affects the calculated total counts. The local mean background count rate was 320 (+3, -4) counts/s. Using cumulative rates, we measure a T90 of 11 (+1, -2) s. The source was also clearly detected in the CsI anticoincidence (Veto) detector in the 100-500 keV energy range. The light curve showed multiple peaks of emission with the strongest peak at 2024-06-27 23:59:00.62 UTC. The measured peak count rate associated with the burst is 1745 (+92, -99) counts/s above the background in the combined data of all quadrants, with a total of 9056 (+393, -439) counts. The local mean background count rate was 1452 (+7, -8) counts/s. We measure a T90 of 12 (+1, -1) s from the cumulative Veto light curve. CZTI is built by a TIFR-led consortium of institutes across India, including VSSC, URSC, IUCAA, SAC, and PRL. The Indian Space Research Organisation funded, managed, and facilitated the project. CZTI GRB detections are reported regularly on the payload site at: http://astrosat.iucaa.in/czti/?q=grb View this GCN Circular online at https://gcn.nasa.gov/circulars/36776. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L… [View Less]

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[vsnet-grb-info 34624] Fermi trigger No 741211696: Global MASTER-Net observations report
by GCN Circulars 28 Jun '24

28 Jun '24

TITLE: GCN CIRCULAR NUMBER: 36775 SUBJECT: Fermi trigger No 741211696: Global MASTER-Net observations report DATE: 24/06/28 00:31:20 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 … [View More]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 GRB240627.84 (trigger No 741211696,14h 21m 00.00s , +48d 31m 12.0s, R=2.29) errorbox 12 sec after notice time and 13640 sec after trigger time at 2024-06-27 23:55:32 UT, with upper limit up to 18.9 mag. Observations started at twilight. The observations began at zenith distance = 61 deg. The sun altitude is -16.4 deg. The galactic latitude b = 62 deg., longitude l = 89 deg. Real time updated cover map and OT discovered available here: https://master.sai.msu.ru/site/master2/observ.php?id=2510641 We obtain a following upper limits. Tmid-T0 | Date Time | Site | Coord (J2000) |Filt.| Expt. | Limit| Comment _________|_____________________|_____________________|____________________________________|_____|_______|_______|________ 13730 | 2024-06-27 23:55:32 | MASTER-Tavrida | (14h 21m 33.42s , +48d 29m 06.9s) | C | 180 | 18.9 | 13730 | 2024-06-27 23:55:32 | MASTER-Tavrida | (14h 21m 36.38s , +48d 24m 39.1s) | C | 180 | 18.2 | 13925 | 2024-06-27 23:58:47 | MASTER-Tavrida | (14h 21m 39.45s , +48d 29m 30.3s) | C | 180 | 18.8 | 13925 | 2024-06-27 23:58:47 | MASTER-Tavrida | (14h 21m 42.46s , +48d 25m 02.3s) | C | 180 | 18.2 | 14120 | 2024-06-28 00:02:02 | MASTER-Tavrida | (14h 21m 37.95s , +48d 30m 55.7s) | C | 180 | 18.8 | 14120 | 2024-06-28 00:02:02 | MASTER-Tavrida | (14h 21m 41.05s , +48d 26m 27.6s) | C | 180 | 18.2 | 14315 | 2024-06-28 00:05:17 | MASTER-Tavrida | (14h 21m 38.65s , +48d 29m 26.6s) | C | 180 | 18.7 | 14315 | 2024-06-28 00:05:17 | MASTER-Tavrida | (14h 21m 41.74s , +48d 24m 58.1s) | C | 180 | 18.1 | 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/36775. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L… [View Less]

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[vsnet-grb-info 34623] EP240626a: Montarrenti Observatory optical upper limit
by GCN Circulars 27 Jun '24

27 Jun '24

TITLE: GCN CIRCULAR NUMBER: 36774 SUBJECT: EP240626a: Montarrenti Observatory optical upper limit DATE: 24/06/27 22:11:13 GMT FROM: Simone Leonini at Montarrenti Observatory (Siena, Italy) <s.leonini(a)iol.it> S. Leonini, M. Conti, P. Rosi, L.M. Tinjaca Ramirez (Montarrenti Observatory, Siena, Italy, part of UAI/SSV-GRB section), M.G. Dainotti (National Astronomical Observatory of Japan), Y. Niino (Tokyo University, Institute of Astronomy), K. Kalinowski (Aarhus University, … [View More]

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[vsnet-grb-info 34622] EP240626a: KAIT optical upper limit
by GCN Circulars 27 Jun '24

27 Jun '24

TITLE: GCN CIRCULAR NUMBER: 36773 SUBJECT: EP240626a: KAIT optical upper limit DATE: 24/06/27 14:49:19 GMT FROM: Weikang Zheng at UC Berkeley <weikang(a)berkeley.edu> WeiKang Zheng (UCB), Xuhui Han (NAOC), Pinpin Zhang (NAOC) and Alexei V. Filippenko (UCB) report on behalf of the KAIT GRB team: The 0.76-m Katzman Automatic Imaging Telescope (KAIT), located at Lick Observatory, responded to the fast X-ray transient EP240626a from the Einstein Probe (Wu et al. GCNC 36766) … [View More]

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[vsnet-grb-info 34621] LIGO/Virgo/KAGRA S240627by: Identification of a GW compact binary merger candidate
by GCN Circulars 27 Jun '24

27 Jun '24

TITLE: GCN CIRCULAR NUMBER: 36772 SUBJECT: LIGO/Virgo/KAGRA S240627by: Identification of a GW compact binary merger candidate DATE: 24/06/27 13:50:28 GMT FROM: andrea.moscatello(a)phd.unipd.it The LIGO Scientific Collaboration, the Virgo Collaboration, and the KAGRA Collaboration report: We identified the compact binary merger candidate S240627by during real-time processing of data from LIGO Hanford Observatory (H1), LIGO Livingston Observatory (L1), and Virgo Observatory (V1) at … [View More]2024-06-27 13:16:22.202 UTC (GPS time: 1403529400.202). The candidate was found by the GstLAL [1], MBTA [2], and PyCBC Live [3] analysis pipelines. S240627by 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/S240627by The classification of the GW signal, in order of descending probability, is BBH (>99%), Terrestrial (<1%), 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 8%. Two sky maps are available at this time and can be retrieved from the GraceDB event page: * bayestar.multiorder.fits,0, an initial localization generated by BAYESTAR [5], distributed via GCN notice about 28 seconds after the candidate event time. * bayestar.multiorder.fits,1, 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,1. For the bayestar.multiorder.fits,1 sky map, the 90% credible region is 934 deg2. Marginalized over the whole sky, the a posteriori luminosity distance estimate is 1479 +/- 420 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] Tsukada et al. PRD 108, 043004 (2023) doi:10.1103/PhysRevD.108.043004 and Ewing et al. (2023) arXiv:2305.05625 [2] Aubin et al. CQG 38, 095004 (2021) doi:10.1088/1361-6382/abe913 [3] Dal Canton et al. ApJ 923, 254 (2021) doi:10.3847/1538-4357/ac2f9a [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/36772. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L… [View Less]

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[vsnet-grb-info 34620] EP240625a: GRANDMA Optical Upper Limits
by GCN Circulars 27 Jun '24

27 Jun '24

TITLE: GCN CIRCULAR NUMBER: 36771 SUBJECT: EP240625a: GRANDMA Optical Upper Limits DATE: 24/06/27 09:44:18 GMT FROM: Sarah Antier at OCA <sarah.antier(a)oca.eu> D. Akl (AUS), A. Le Calloch (Berkeley), Y.Rajabov (UBAI), M. Molham (KAO), S. Antier (OCA), S. Karpov (FZU), M. Coughlin (UMN), C. Andrade (UMN), I. Tosta e Melo (UniCT-DFA), P. Hello, N. Leroy (IJCLAB), P-A Duverne (APC), D. Turpin (CEA-Saclay/Irfu), T. Pradier (Unistra/IPHC), N. Guessoum (AUS), M. Masek (FZU), M. … [View More]Prouza (FZU), A. Kaeouch (OUCA), M. Freeberg (KNC), N. Leroy (IJCLAB) on behalf of the GRANDMA collaboration: We performed observations with GRANDMA and its citizen science project Kilonova-catcher (KNC) on the X-ray transient EP240625a detected by Einstein Probe (EP) WXT on T0 = 2024-06-25T01:48:23 (Pan et al., GCN 36757). We monitored the source with three telescopes, including FRAM-CTA-N, KNC-T32, KNC-ASO, from 2024-06-26T00:33:03.632 to 2024-06-26T16:15:48 UTC, starting 0.95 days after the EP trigger. We did not find any new optical counterpart in any of our frames within 10 arcsec radius centered around Ra/Dec: 310.7308, -15.9760. All our observations and upper limits, which correspond to the depth of the full image (given in the AB system), can be found here: https://skyportal-icare.ijclab.in2p3.fr/public/sources/EP240625a/version/fb… Below is the version that can be downloaded from the link above: +--------------+----------+----------------+-------------------+ | MJD | Filter | Lim.Mag | Instrument | +==============+==========+================+===================+ | 60487.008465 | L | 20.04 | KNC-ASO | +--------------+----------+----------------+-------------------+ | 60487.061847 | G | 19.84 | KNC-ASO | +--------------+----------+----------------+-------------------+ | 60487.034262 | R | 19.46 | KNC-ASO | +--------------+----------+----------------+-------------------+ | 60487.091242 | B | 20.13 | KNC-ASO | +--------------+----------+----------------+-------------------+ | 60487.182141 | R | 16.95 | FRAM-CTA-N | +--------------+----------+----------------+-------------------+ | 60487.626447 | V | 19.88 | KNC-T32 | +--------------+----------+----------------+-------------------+ We note that bessellv and bessellr filters correspond to V and R Johnson Cousin filters, respectively.Images obtained in Johnson Cousin filters were calibrated using the Gaia DR3 Synphot catalog while images taken with Sloan filters were calibrated using the Pan-STARRS DR1 Catalog. We also note that some amateur telescopes use green filters, which were calibrated with the Gaia eDR3 catalog.Generic telescopes correspond to KNC telescopes. We performed force photometry on our images at Ra, Dec: 20:42:55.47, -15:58:24.00 (S.Y. Fu et al., GCN 36761). We did not detect a source at that position at 20.7 upper limit in the V-band (Vega, 5 sigma). All the data have been reduced by a single data processing pipeline STDPIPE (Karpov et al., 2022). We use the Skyportal application (skyportal.io) to monitor our observational campaign. We thank the Einstein Probe team for useful communication. GRANDMA is a worldwide telescope network (grandma.ijclab.in2p3.fr) devoted to the observation of transients in the context of multi-messenger astrophysics (Antier et al. 2020 MNRAS 497, 5518). Kilonova-Catcher (KNC) is the citizen science program of GRANDMA (http://kilonovacatcher.in2p3.fr/). View this GCN Circular online at https://gcn.nasa.gov/circulars/36771. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L… [View Less]

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[vsnet-grb-info 34619] EP240626a: EP-FXT detection of the X-ray emission
by GCN Circulars 27 Jun '24

27 Jun '24

TITLE: GCN CIRCULAR NUMBER: 36770 SUBJECT: EP240626a: EP-FXT detection of the X-ray emission DATE: 24/06/27 05:45:49 GMT FROM: EP Team at NAOC/CAS <ep_ta(a)bao.ac.cn> Q.Y. Wu, Z. Z. Lv (NAOC, CAS), Q. C. Shui (IHEP, CAS), Z. X. Ling, Y. Liu, C. Zhang, C. C. Jin, W. Chen, H. Q. Cheng, C. Z. Cui, D. W. Fan, H. B. Hu, J. W. Hu, M. H. Huang, D. Y. Li, H. Y. Liu, M. J. Liu, T. Y. Lian, X. Mao, H. W. Pan, X. Pan, H. Sun, W. X. Wang, Y. L. Wang, X. P. Xu, Y. F. Xu, H. N. Yang, W. Yuan, … [View More]

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[vsnet-grb-info 34618] GRB 240624A: Swift-BAT refined analysis
by GCN Circulars 26 Jun '24

26 Jun '24

TITLE: GCN CIRCULAR NUMBER: 36769 SUBJECT: GRB 240624A: Swift-BAT refined analysis DATE: 24/06/26 22:29:41 GMT FROM: Amy <yarleen(a)gmail.com> D. M. Palmer (LANL), S. D. Barthelmy (GSFC), R. Gupta (GSFC), H. A. Krimm (NSF), S. Laha (GSFC/UMBC), A. Y. Lien (U Tampa), C. B. Markwardt (GSFC), M. J. Moss (GSFC), T. Parsotan (GSFC), D. Sadaula (GSFC/UMBC), T. Sakamoto (AGU) (i.e. the Swift-BAT team): Using the data set from T-240 to T+962 sec from the recent telemetry downlink, we … [View More]

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