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

[vsnet-grb-info 36538] GRB 241209B: Mondy AZT-33IK and AbAO AS-32 optical observations
by GCN Circulars 12 Dec '24

12 Dec '24

TITLE: GCN CIRCULAR NUMBER: 38539 SUBJECT: GRB 241209B: Mondy AZT-33IK and AbAO AS-32 optical observations DATE: 24/12/12 06:24:33 GMT FROM: Nicolai Pankov at HSE, IKI RAS <colinsergesen(a)gmail.com> N. Pankov (HSE, IKI), A. Pozanenko (IKI), E. Klunko (ISTP), R. Ya. Inasaridze (AbAO) report on behalf of IKI-GRB-FuN: We performed optical observations of GRB 241209B (Xie et. al, GCN 38478; Evans, GCN 38494; Perez-Garcia et. al, GCN 38499; Qiu et. al, GCN 38516; Williams et. al, … [View More]

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[vsnet-grb-info 36537] GRB 241209A: Chandra X-ray Detection
by GCN Circulars 11 Dec '24

11 Dec '24

TITLE: GCN CIRCULAR NUMBER: 38538 SUBJECT: GRB 241209A: Chandra X-ray Detection DATE: 24/12/11 19:27:31 GMT FROM: Peter Blanchard at Harvard <peter.blanchard(a)cfa.harvard.edu> Peter K. Blanchard and Edo Berger (Harvard) report on behalf of a larger collaboration: We observed the short GRB 241209A (GCNs 38474, 38476) with Chandra/ACIS (Program 25500091, PI: Berger) starting at UT 2024-12-10 13:47:26 with an exposure time of 19.8 ks (mid-time of 38.4 hr post-burst). We detect a … [View More]

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[vsnet-grb-info 36536] Konus-Wind detection of GRB 241209B
by GCN Circulars 11 Dec '24

11 Dec '24

TITLE: GCN CIRCULAR NUMBER: 38537 SUBJECT: Konus-Wind detection of GRB 241209B DATE: 24/12/11 15:50:35 GMT FROM: Anna Ridnaia at Ioffe Institute <ridnaia(a)mail.ioffe.ru> A. Ridnaia, D. Frederiks, A. Lysenko, D. Svinkin, A. Tsvetkova, M. Ulanov, and T. Cline, on behalf of the Konus-Wind team, report: The long-duration GRB 241209B (SVOM/ECLAIRs and GRM detection: Xie et al., GCN 38478; Swift/BAT-GUANO localization: DeLaunay et al., GCN 38528; GRBAlpha detection: Dafcikova et al.… [View More]

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[vsnet-grb-info 36535] GRB 241207A: EIRSAT-1 GMOD Detection
by GCN Circulars 11 Dec '24

11 Dec '24

TITLE: GCN CIRCULAR NUMBER: 38536 SUBJECT: GRB 241207A: EIRSAT-1 GMOD Detection DATE: 24/12/11 14:44:53 GMT FROM: Caimin McKenna at University College Dublin <caimin.mckenna(a)ucdconnect.ie> C. McKenna, D. Murphy, C. de Barra, A. Ulyanov, P. McDermott, M. Doyle, R. Dunwoody, J. Mangan, G. Finneran, G. Corcoran, L. Cotter, A. Empey, J. Fisher, F. Gibson Kiely, J. Thompson, D. McKeown, A. Martin-Carrillo, L. Hanlon, S. McBreen, on behalf of the EIRSAT-1 team: EIRSAT-1 reports … [View More]

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[vsnet-grb-info 36534] GRB 241209A: Redshift of the likely host galaxy z = 0.784 from OSIRIS+/GTC
by GCN Circulars 11 Dec '24

11 Dec '24

TITLE: GCN CIRCULAR NUMBER: 38535 SUBJECT: GRB 241209A: Redshift of the likely host galaxy z = 0.784 from OSIRIS+/GTC DATE: 24/12/11 13:22:54 GMT FROM: Antonio de Ugarte Postigo at LAM/OCA, CNRS <deugarte(a)oca.eu> A. de Ugarte Postigo (OCA and LAM, CNRS), D. B. Malesani (DAWN/NBI and Radboud Univ.), J. F. Agui Fernandez (CAHA), N. R. Tanvir (U. Leicester), C. C. Thoene (ASU-CAS, AbAO), N. A. Rakotondrainibe (LAM), L. Izzo (INAF-OACn & DARK/NBI), A. Martin-Carrillo (UCD), J. … [View More]P. U. Fynbo (DAWN/NBI), S. Geier (GTC), G. L. Lombardi (GTC), N. Castro Rodriguez (GTC), A. Marante-Barreto (GTC), A. Cabrera Lavers (GTC) report: The refined X-ray counterpart error region (Evans et al., GCN 38486) of the short GRB 241209A (Fermi collaboration, GCN 38474; Parson et al., GCN 38476; Cie et al., GCN 38478) includes two galaxies, which were identified in FORS2/VLT imaging (de Ugarte Postigo et al., GCN 38484). The fainter one, which was favoured by the initial X-ray localisation (Page et al., GCN 38479) has a redshift of z=1.490, as measured with X-shooter/VLT (Saccardi et al., GCN 38487). The inclusion of the brighter one within the refined X-ray error box, makes it a more likely candidate host for the GRB, because of a lower chance coincidence, as already mentioned by Saccardi et al. The candidate NIR counterpart reported by Schneider et al. (GCN 38506) also lies within the extension of the brighter galaxy. Should it be confirmed to fade, this would also favour this as the GRB host. We obtained spectroscopy of this, brighter and more likely host galaxy candidate (located at RA = 10:21:35.09, Dec = +06:19:45.4) using OSIRIS+ mounted on the 10.4m GTC telescope, at the Roque de los Muchachos observatory, on the island of La Palma (Spain). The observation consisted of 3x900s using grism R1000R, which has a spectral coverage between 5100 and 10000Å at a resolving power of 670. The spectrum shows continuum over the complete range and bright emission features that we identify as due to [OII], H-beta and [OIII] as well as CaII H and K absorptions at a common redshift of z = 0.784, which we identify as the redshift of the most likely host galaxy of GRB 241209A. We note that this is consistent with the Legacy Survey photometric redshift of 0.78+/- 0.08 (Zhou et al. 2021, MNRAS, 501, 3309). View this GCN Circular online at https://gcn.nasa.gov/circulars/38535. --- 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 36533] GRB 241209B: GRBAlpha detection
by GCN Circulars 11 Dec '24

11 Dec '24

TITLE: GCN CIRCULAR NUMBER: 38534 SUBJECT: GRB 241209B: GRBAlpha detection DATE: 24/12/11 11:01:02 GMT FROM: Marianna Dafčíková at Masaryk University <500025(a)mail.muni.cz> M. Dafcikova, J. Ripa, M. Kolar (Masaryk U.), A. Pal (Konkoly Observatory), N. Werner (Masaryk U.), M. Ohno, H. Takahashi (Hiroshima U.), L. Meszaros, B. Csak (Konkoly Observatory), N. Husarikova, F. Munz , M. Topinka, M. Duriskova, L. Szakszonova, J.-P. Breuer, F. Hroch (Masaryk U.), T. Urbanec, M. Kasal, … [View More]A. Povalac (Brno U. of Technology), J. Hudec, J. Kapus, M. Frajt (Spacemanic s.r.o), R. Laszlo, M. Koleda (Needronix s.r.o), M. Smelko, P. Hanak, P. Lipovsky (Technical U. of Kosice), G. Galgoczi (Wigner Research Center/Eotvos U.), Y. Uchida, H. Poon, H. Matake (Hiroshima U.), N. Uchida (ISAS/JAXA), T. Bozoki (Eotvos U.), G. Dalya (Eotvos U.), T. Enoto (Kyoto U.), Zs. Frei (Eotvos U.), G. Friss (Eotvos U.), Y. Fukazawa, K. Hirose (Hiroshima U.), S. Hisadomi (Nagoya U.), Y. Ichinohe (Rikkyo U.), K. Kapas (Eotvos U.), L. L. Kiss (Konkoly Observatory), T. Mizuno (Hiroshima U.), K. Nakazawa (Nagoya U.), H. Odaka (Univ of Tokyo), J. Takatsy (Eotvos U.), K. Torigoe (Hiroshima U.), N. Kogiso, M. Yoneyama (Osaka Metropolitan U.), M. Moritaki (U. Tokyo), T. Kano (U. Michigan) -- the GRBAlpha collaboration. The long-duration GRB 241209B (SVOM/GRM detection: GCN 38478; Swift/BAT-GUANO detection: GCN 38528) was observed by the GRBAlpha 1U CubeSat (Pal et al. 2023, A&A, 677, 40; https://ui.adsabs.harvard.edu/abs/2023A%26A...677A..40P/abstract). The detection was confirmed at the peak time 2024-12-09 03:56:19.7 UTC. The T90 duration measured by GRBAlpha is 1.5 s and the overall significance during T90 reaches 6.7 sigma. The light curve obtained by GRBAlpha is available here: https://grbalpha.konkoly.hu/static/share/GRB241209B_GCN.pdf All GRBAlpha detections are listed at: https://monoceros.physics.muni.cz/hea/GRBAlpha/ GRBAlpha, launched on 2021 March 22, is a demonstration mission for a future CubeSat constellation (Werner et al. Proc. SPIE 2018). The detector of GRBAlpha consists of a 75 x 75 x 5 mm3 CsI scintillator read out by a SiPM array, covering the energy range from ~50 keV to ~1000 keV. To increase the duty cycle and the downlink rate, the upgrade of the on-board data acquisition software stack is in progress. The ground segment is also supported by the radio amateur community and it takes advantage of the SatNOGS network for increased data downlink volume. View this GCN Circular online at https://gcn.nasa.gov/circulars/38534. --- 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 36532] GRB 241206C: GRBAlpha detection
by GCN Circulars 11 Dec '24

11 Dec '24

TITLE: GCN CIRCULAR NUMBER: 38533 SUBJECT: GRB 241206C: GRBAlpha detection DATE: 24/12/11 10:59:48 GMT FROM: Marianna Dafčíková at Masaryk University <500025(a)mail.muni.cz> M. Dafcikova, J. Ripa, M. Kolar (Masaryk U.), A. Pal (Konkoly Observatory), N. Werner (Masaryk U.), M. Ohno, H. Takahashi (Hiroshima U.), L. Meszaros, B. Csak (Konkoly Observatory), N. Husarikova, F. Munz , M. Topinka, M. Duriskova, L. Szakszonova, J.-P. Breuer, F. Hroch (Masaryk U.), T. Urbanec, M. Kasal, … [View More]A. Povalac (Brno U. of Technology), J. Hudec, J. Kapus, M. Frajt (Spacemanic s.r.o), R. Laszlo, M. Koleda (Needronix s.r.o), M. Smelko, P. Hanak, P. Lipovsky (Technical U. of Kosice), G. Galgoczi (Wigner Research Center/Eotvos U.), Y. Uchida, H. Poon, H. Matake (Hiroshima U.), N. Uchida (ISAS/JAXA), T. Bozoki (Eotvos U.), G. Dalya (Eotvos U.), T. Enoto (Kyoto U.), Zs. Frei (Eotvos U.), G. Friss (Eotvos U.), Y. Fukazawa, K. Hirose (Hiroshima U.), S. Hisadomi (Nagoya U.), Y. Ichinohe (Rikkyo U.), K. Kapas (Eotvos U.), L. L. Kiss (Konkoly Observatory), T. Mizuno (Hiroshima U.), K. Nakazawa (Nagoya U.), H. Odaka (Univ of Tokyo), J. Takatsy (Eotvos U.), K. Torigoe (Hiroshima U.), N. Kogiso, M. Yoneyama (Osaka Metropolitan U.), M. Moritaki (U. Tokyo), T. Kano (U. Michigan) -- the GRBAlpha collaboration. We report a possible sub-threshold detection of the short-duration GRB 241206C (SVOM/GRM detection: GCN 38455) by the GRBAlpha 1U CubeSat (Pal et al. 2023, A&A, 677, 40; https://ui.adsabs.harvard.edu/abs/2023A%26A...677A..40P/abstract). The detection peak time is at 2024-12-06 10:03:43.5 UTC. The light curve observed by GRBAlpha shows a spike within a 0.5 s bin where the significance reaches 3.6 sigma in the ~80-120 keV band. The light curve obtained by GRBAlpha is available here: https://grbalpha.konkoly.hu/static/share/GRB241206C_GCN.pdf All GRBAlpha detections are listed at: https://monoceros.physics.muni.cz/hea/GRBAlpha/ GRBAlpha, launched on 2021 March 22, is a demonstration mission for a future CubeSat constellation (Werner et al. Proc. SPIE 2018). The detector of GRBAlpha consists of a 75 x 75 x 5 mm3 CsI scintillator read out by a SiPM array, covering the energy range from ~50 keV to ~1000 keV. To increase the duty cycle and the downlink rate, the upgrade of the on-board data acquisition software stack is in progress. The ground segment is also supported by the radio amateur community and it takes advantage of the SatNOGS network for increased data downlink volume. View this GCN Circular online at https://gcn.nasa.gov/circulars/38533. --- 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 36531] LIGO/Virgo/KAGRA S241210cw: Updated Sky localization
by GCN Circulars 11 Dec '24

11 Dec '24

TITLE: GCN CIRCULAR NUMBER: 38532 SUBJECT: LIGO/Virgo/KAGRA S241210cw: Updated Sky localization DATE: 24/12/11 10:35:27 GMT FROM: Soichiro Morisaki at U. of Tokyo <soichiro.morisaki(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) … [View More]

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[vsnet-grb-info 36530] LIGO/Virgo/KAGRA S241210d: Updated Sky localization and EM Bright Classification
by GCN Circulars 11 Dec '24

11 Dec '24

TITLE: GCN CIRCULAR NUMBER: 38531 SUBJECT: LIGO/Virgo/KAGRA S241210d: Updated Sky localization and EM Bright Classification DATE: 24/12/11 10:24:18 GMT FROM: Soichiro Morisaki at U. of Tokyo <soichiro.morisaki(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) and LIGO Livingston Observatory (L1) data around the time of the compact binary merger (CBC) … [View More]

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[vsnet-grb-info 36529] GRB 241211A: Fermi GBM Final Real-time Localization
by GCN Circulars 11 Dec '24

11 Dec '24

TITLE: GCN CIRCULAR NUMBER: 38530 SUBJECT: GRB 241211A: Fermi GBM Final Real-time Localization DATE: 24/12/11 02:33:44 GMT FROM: Fermi GBM Team at MSFC/Fermi-GBM <do_not_reply(a)GIOC.nsstc.nasa.gov> The Fermi GBM team reports the detection of a likely SHORT GRB At 02:23:21 UT on 11 Dec 2024, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 241211A (trigger 755576606.874556 / 241211100). The on-ground calculated location, using the Fermi GBM trigger data, is RA … [View More]

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