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

[vsnet-grb-info 34819] GRB 240720B: GRBAlpha detection
by GCN Circulars 27 Jul '24

27 Jul '24

TITLE: GCN CIRCULAR NUMBER: 36955 SUBJECT: GRB 240720B: GRBAlpha detection DATE: 24/07/27 19:59:34 GMT FROM: Marianna Dafčíková at Masaryk University <500025(a)mail.muni.cz> J. Ripa, M. Dafcikova, 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, 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 short-duration GRB 240720B (AstroSat/CZTI detection: GCN 36913; SVOM/GRM detection: GCN 36915; INTEGRAL/SPI-ACS detection: trigger no. 10798; Konus/Wind detection trigger at 2024-07-20 16:11:28.495 UTC) 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 2024-07-20 16:11:29.1 UTC. The T90 duration measured by GRBAlpha is 0.5 s and the overall significance during T90 reaches 11.6 sigma. The light curve obtained by GRBAlpha is available here: https://grbalpha.konkoly.hu/static/share/GRB240720B_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/36955. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

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[vsnet-grb-info 34818] GRB 240718A: GRBAlpha detection
by GCN Circulars 27 Jul '24

27 Jul '24

TITLE: GCN CIRCULAR NUMBER: 36954 SUBJECT: GRB 240718A: GRBAlpha detection DATE: 24/07/27 19:57:33 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, 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 240718A (Fermi/GBM detection: GCN 36898; SVOM/GRM detection: GCN 36900; Konus/Wind detection: GCN 36907; INTEGRAL/SPI-ACS detection: trigger no. 10795) 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 2024-07-18 06:29:06.7 UTC. The T90 duration measured by GRBAlpha is 13.5 s and the overall significance during T90 reaches 27 sigma. The light curve obtained by GRBAlpha is available here: https://grbalpha.konkoly.hu/static/share/GRB240718A_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/36954. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

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[vsnet-grb-info 34817] GRB 240710B: GRBAlpha detection
by GCN Circulars 27 Jul '24

27 Jul '24

TITLE: GCN CIRCULAR NUMBER: 36953 SUBJECT: GRB 240710B: GRBAlpha detection DATE: 24/07/27 19:56:12 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, 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 240710B (Fermi/GBM detection: trigger no. 742317942; Konus/Wind detection trigger at 2024-07-10 15:25:41.692 UT) 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 2024-07-10 15:25:39.9 UTC. The T90 duration measured by GRBAlpha is 5.0 s and the overall significance during T90 reaches 7.2 sigma. The light curve obtained by GRBAlpha is available here: https://grbalpha.konkoly.hu/static/share/GRB240710B_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/36953. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

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[vsnet-grb-info 34816] GRB 240627A: GRBAlpha detection
by GCN Circulars 27 Jul '24

27 Jul '24

TITLE: GCN CIRCULAR NUMBER: 36952 SUBJECT: GRB 240627A: GRBAlpha detection DATE: 24/07/27 19:53:40 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, 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 240627A (AstroSat/CZTI detection: GCN 36776; NuSTAR detection: GCN 36778; CALET/CGBM detection: GCN 36798; Konus/Wind detection: GCN 36830; INTEGRAL/SPI-ACS peak detection at 2024-06-27 ~23:59:03 UT) 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 2024-06-27 23:59:07.2 UTC. The T90 duration measured by GRBAlpha is 13.5 s and the overall significance during T90 reaches 29 sigma. The light curve obtained by GRBAlpha is available here: https://grbalpha.konkoly.hu/static/share/GRB240627A_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/36952. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

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[vsnet-grb-info 34815] Fermi GRB 240726A: Global MASTER-Net observations report
by GCN Circulars 27 Jul '24

27 Jul '24

TITLE: GCN CIRCULAR NUMBER: 36951 SUBJECT: Fermi GRB 240726A: Global MASTER-Net observations report DATE: 24/07/27 19:45:22 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 GRB 240726A ( Fermi GBM team, GCN 36935) errorbox 1 days 37487 sec after notice time and 1 days 37518 sec after trigger time at 2024-07-27 18:33:07 UT, with upper limit up to 17.8 mag. Observations started at twilight. The observations began at zenith distance = 66 deg. The sun altitude is -12.7 deg. The galactic latitude b = 29 deg., longitude l = 149 deg. Real time updated cover map and OT discovered available here: https://master.sai.msu.ru/site/master2/observ.php?id=2541434 We obtain a following upper limits. Tmid-T0 | Date Time | Site | Coord (J2000) |Filt.| Expt. | Limit| Comment _________|_____________________|_____________________|____________________________________|_____|_______|_______|________ 123949 | 2024-07-27 18:33:07 | MASTER-Tavrida | (07h 29m 45.02s , +67d 15m 35.0s) | C | 60 | 17.0 | 124021 | 2024-07-27 18:34:20 | MASTER-Tavrida | (07h 32m 21.89s , +65d 55m 08.3s) | C | 60 | 17.2 | 124095 | 2024-07-27 18:35:34 | MASTER-Tavrida | (07h 06m 51.82s , +65d 56m 42.9s) | C | 60 | 17.1 | 124190 | 2024-07-27 18:37:08 | MASTER-Tavrida | (07h 03m 09.14s , +67d 36m 51.4s) | C | 60 | 14.7 | 124284 | 2024-07-27 18:38:43 | MASTER-Tavrida | (07h 27m 03.71s , +68d 33m 26.0s) | C | 60 | 17.5 | 124357 | 2024-07-27 18:39:56 | MASTER-Tavrida | (07h 10m 39.52s , +64d 37m 28.3s) | C | 60 | 17.1 | 124668 | 2024-07-27 18:45:06 | MASTER-Tavrida | (06h 58m 49.49s , +68d 53m 16.9s) | C | 60 | 16.0 | 125157 | 2024-07-27 18:53:16 | MASTER-Tavrida | (07h 29m 49.29s , +67d 15m 40.6s) | C | 60 | 17.7 | 125230 | 2024-07-27 18:54:28 | MASTER-Tavrida | (07h 50m 32.61s , +67d 14m 19.2s) | C | 60 | 17.6 | 125303 | 2024-07-27 18:55:41 | MASTER-Tavrida | (07h 32m 24.67s , +65d 55m 29.8s) | C | 60 | 17.5 | 125376 | 2024-07-27 18:56:55 | MASTER-Tavrida | (07h 52m 09.01s , +65d 55m 40.9s) | C | 60 | 17.6 | 125471 | 2024-07-27 18:58:29 | MASTER-Tavrida | (07h 07m 07.62s , +66d 19m 47.9s) | C | 60 | 15.2 | 125566 | 2024-07-27 19:00:04 | MASTER-Tavrida | (07h 26m 34.24s , +65d 56m 25.9s) | C | 60 | 17.4 | 125666 | 2024-07-27 19:01:44 | MASTER-Tavrida | (07h 03m 09.83s , +67d 37m 37.3s) | C | 60 | 15.4 | 125761 | 2024-07-27 19:03:20 | MASTER-Tavrida | (07h 23m 33.94s , +67d 15m 10.3s) | C | 60 | 17.0 | 125857 | 2024-07-27 19:04:55 | MASTER-Tavrida | (07h 27m 20.53s , +68d 56m 05.3s) | C | 60 | 15.9 | 125951 | 2024-07-27 19:06:29 | MASTER-Tavrida | (07h 49m 11.27s , +68d 33m 08.8s) | C | 60 | 17.8 | 126045 | 2024-07-27 19:08:04 | MASTER-Tavrida | (07h 10m 55.30s , +65d 00m 19.5s) | C | 60 | 13.6 | 126140 | 2024-07-27 19:09:38 | MASTER-Tavrida | (07h 29m 31.59s , +64d 38m 26.1s) | C | 60 | 17.2 | 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/36951. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

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[vsnet-grb-info 34814] GRB 240727A: Enhanced Swift-XRT position
by GCN Circulars 27 Jul '24

27 Jul '24

TITLE: GCN CIRCULAR NUMBER: 36950 SUBJECT: GRB 240727A: Enhanced Swift-XRT position DATE: 24/07/27 19:08:09 GMT FROM: Phil Evans at U of Leicester <pae9(a)star.le.ac.uk> A.P. Beardmore, P.A. Evans, M.R. Goad and J.P. Osborne (U. Leicester) report on behalf of the Swift-XRT team. Using 1103 s of XRT Photon Counting mode data and 2 UVOT images for GRB 240727A, we find an astrometrically corrected X-ray position (using the XRT-UVOT alignment and matching UVOT field sources to the USNO-B1 catalogue): RA, Dec = 236.43735, +8.61996 which is equivalent to: RA (J2000): 15h 45m 44.96s Dec (J2000): +08d 37' 11.9" with an uncertainty of 2.8 arcsec (radius, 90% confidence). This position may be improved as more data are received. The latest position can be viewed at http://www.swift.ac.uk/xrt_positions. Position enhancement is described by Goad et al. (2007, A&A, 476, 1401) and Evans et al. (2009, MNRAS, 397, 1177). This circular was automatically generated, and is an official product of the Swift-XRT team. View this GCN Circular online at https://gcn.nasa.gov/circulars/36950. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

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[vsnet-grb-info 34813] GRB 240727B: Fermi GBM Observation
by GCN Circulars 27 Jul '24

27 Jul '24

TITLE: GCN CIRCULAR NUMBER: 36949 SUBJECT: GRB 240727B: Fermi GBM Observation DATE: 24/07/27 19:00:39 GMT FROM: Cori Fletcher at USRA <cfletcher(a)usra.edu> C. Fletcher (USRA), R. Hamburg (CNRS/IJCLab) and C. Meegan (UAH) report on behalf of the Fermi Gamma-ray Burst Monitor Team: "At 06:00:08.96 UT on 27 July 2024, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 240727B (trigger 743752813/240727250). which was also detected by Swift/BAT-GUANO (Ronchini et al. 2024, GCN 36945) and AstroSat (Waratkar et al. 2024, GCN 36943). The Fermi GBM on-ground location is consistent with the Swift/BAT-GUANO position. The angle from the Fermi LAT boresight is 114 degrees. The GBM light curve consists of multiple peaks with a duration (T90) of about 19 s (50-300 keV). The time-averaged spectrum from T0-3.3 to T0+20.2 s is best fit by a power law function with an exponential high-energy cutoff. The power law index is -0.3 +/- 0.1 and the cutoff energy, parameterized as Epeak, is 850 +/- 90 keV. The event fluence (10-1000 keV) in this time interval is (1.52 +/- 0.05)E-05 erg/cm^2. The 1-sec peak photon flux measured starting from T0+8.7 s in the 10-1000 keV band is 3.4 +/- 0.4 ph/s/cm^2. A Band function fits the spectrum equally well with Epeak= 848 +/- 116 keV, alpha = -0.3 +/- 0.1 and beta = -2.5 +/- 0.3. The spectral analysis results presented above are preliminary; final results will be published in the GBM GRB Catalog: https://heasarc.gsfc.nasa.gov/W3Browse/fermi/fermigbrst.html For Fermi GBM data and info, please visit the official Fermi GBM Support Page: https://fermi.gsfc.nasa.gov/ssc/data/access/gbm/" View this GCN Circular online at https://gcn.nasa.gov/circulars/36949. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

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[vsnet-grb-info 34812] Swift GRB240727.16: Global MASTER-Net observations report
by GCN Circulars 27 Jul '24

27 Jul '24

TITLE: GCN CIRCULAR NUMBER: 36948 SUBJECT: Swift GRB240727.16: Global MASTER-Net observations report DATE: 24/07/27 18:36:41 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) was pointed to the Swift GRB240727.16 (trigger No 1245074,15h 45m 45.60s , +08d 37m 04.8s, R=0.00138889) errorbox 51707 sec after notice time and 51741 sec after trigger time at 2024-07-27 18:10:34 UT, with upper limit up to 16.7 mag. Observations started at twilight. The observations began at zenith distance = 38 deg. The sun altitude is -9.6 deg. The galactic latitude b = 44 deg., longitude l = 17 deg. Real time updated cover map and OT discovered available here: https://master.sai.msu.ru/site/master2/observ.php?id=2542247 We obtain a following upper limits. Tmid-T0 | Site |Filt.| Expt. | Limit| Comment _________|_____________________|_____|_______|______|________ 51832 | MASTER-Tavrida | C | 180 | 16.7 | 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/36948. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

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[vsnet-grb-info 34811] GRB240529A: VIRT optical transient detection
by GCN Circulars 27 Jul '24

27 Jul '24

TITLE: GCN CIRCULAR NUMBER: 36947 SUBJECT: GRB240529A: VIRT optical transient detection DATE: 24/07/27 17:41:52 GMT FROM: Priya Gokuldass at ERAU <gokuldap(a)my.erau.edu> K. Smith (UVI), P. Gokuldass (ERAU), N. Orange (OrangeWave Innovative Science, LLC), D. Morris (NASA), T. Lombardi (Eckerd College), K. Noonan (UVI), D. Smith (UVI), R. Querrard (UVI) report: We observed the field of GRB240529A (Eyles-Ferris et al., GCN 36556; Joshi et al., GCN 36560; Tan et al., GCN 36578; Kozyrev et al., GCN 36583; Svinkin et al., GCN 36584) with the 0.5m Virgin Islands Robotic Telescope (VIRT) at the University of the Virgin Islands' Etelman Observatory on 2024-05-30 starting at 7:10:12 UT (with Tmid as T+ 28.19 hrs). We performed a series of exposures in R filter with a total exposure of 2630s. The weather conditions were partly cloudy during the hours of observation with an average airmass of ~1.36. We detect the optical transient reported by others (Kumar et al. GCN 36559; Fu et al. GCN 36561; Shilling et al. GCN 36562; Perez-Garcia et al. GCN 36563; Dutton et al. GCN 36568; Mo et al. GCN 36569; Odeh et al. GCNs 36573, 36592; de Ugarte Postigo et al. GCN 36574; Adami et al. GCN 36575; Mohan et al. GCN 36576; Vinko et al. GCN 36577; Lim et al. GCN 36579; Moskvitin et al. GCNs 36582, 36597, 36601 ; Pankov et al. GCN 36585; Ror et al., GCN 36589; Hu et al. GCN 36599; Lipunov et al. GCN 36603). Our data are consistent with the slow decay suggested through earlier reports (Odeh et al. GCN 36573, 36592; Lim et al. GCN 36579; Ror et al. GCN 36589; Moskvitin et al. GCNs 36582, 36597, 36601; Rossi et al. GCN 36655). We report the following magnitude: T_mid. ||Exposure ||Filter ||Magnitude T+ 28.19 hrs ||2630s ||R ||19.4 +/- 0.1 The limit is estimated from comparison to nearby PANSTAARS and is not corrected for Galactic extinction. The VIRT is still in the commissioning phase. We acknowledge financial support from NASA MUREP MIRO awad 80NSSC21M001, NASA EPSCoR award 80NNSC22M0063, and NSF PAARE award 2319415. We also acknowledge the use of STDWeb interface to verify our result. View this GCN Circular online at https://gcn.nasa.gov/circulars/36947. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

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[vsnet-grb-info 34810] GRB 240727B: Swift ToO observations
by GCN Circulars 27 Jul '24

27 Jul '24

TITLE: GCN CIRCULAR NUMBER: 36946 SUBJECT: GRB 240727B: Swift ToO observations DATE: 24/07/27 15:19:02 GMT FROM: Phil Evans at U of Leicester <pae9(a)star.le.ac.uk> P. A. Evans (U. Leicester) reports on behalf of the Swift team: Swift has initiated a ToO observation of the Fermi/GBM GRB 240727B. Automated analysis of the XRT data will be presented online at https://www.swift.ac.uk/ToO_GRBs/00021701 Any uncatalogued X-ray sources detected in this analysis will be reported on this website and via GCN COUNTERPART notices. These are not necessarily related to the Fermi/GBM event. Any X-ray source considered to be a probable afterglow candidate will be reported via a GCN Circular after manual consideration. Details of the XRT automated analysis methods are detailed in Evans et al. (2007, A&A, 469, 379; 2009, MNRAS, 397, 1177 and 2014, ApJS, 210, 8). This circular is an official product of the Swift-XRT team. View this GCN Circular online at https://gcn.nasa.gov/circulars/36946. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

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