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

[vsnet-grb-info 33507] GRB 240129A: Fermi GBM Observation
by GCN Circulars 31 Jan '24

31 Jan '24

TITLE: GCN CIRCULAR NUMBER: 35655 SUBJECT: GRB 240129A: Fermi GBM Observation DATE: 24/01/31 15:28:04 GMT FROM: Vidushi Sharma at NASA GSFC/UMBC <vidushi.sharma(a)nasa.gov> S. Dalessi (UAH), V Sharma (NASA-GSFC/UMBC) and C. Meegan (UAH) report on behalf of the Fermi Gamma-ray Burst Monitor Team: "At 15:09:22.53 UT on 29 January 2024, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 240129A (trigger 728233767/240129632), which was also detected by Swift/BAT-GUANO (DeLaunay et al. 2024, GCN 35653). The on-ground calculated location, using the Fermi GBM trigger data, is RA = 108.02, Dec = 34.60 (J2000 degrees, equivalent to J2000 07h 12m, 34d 36'), with a statistical uncertainty of 3.18 degrees. (radius, 1-sigma containment, statistical only; there is additionally a systematic error which we have characterized as a core-plus-tail model, with 90% of GRBs having a 3.7 deg error and a small tail suffering a larger than 10 deg systematic error [Connaughton et al. 2015, ApJS, 216, 32]). The angle from the Fermi LAT boresight is 114 degrees. The GBM light curve of a single emission episode with a duration (T90) of about 28 s (50-300 keV). The time-averaged spectrum from T0+6.1 to T0+21.5 s is best fit by a power law function with an exponential high-energy cutoff. The power law index is -1.24 +/- 0.09 and the cutoff energy, parameterized as Epeak, is 74 +/- 6 keV. The event fluence (10-1000 keV) in this time interval is (4.6 +/- 0.2)E-06 erg/cm^2. The 1-sec peak photon flux measured starting from T0+0.38 s in the 10-1000 keV band is 4.9 +/- 0.3 ph/s/cm^2. 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/35655. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

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[vsnet-grb-info 33506] IPN triangulation of GRB 240125B (short)
by GCN Circulars 30 Jan '24

30 Jan '24

TITLE: GCN CIRCULAR NUMBER: 35654 SUBJECT: IPN triangulation of GRB 240125B (short) DATE: 24/01/30 19:43:07 GMT FROM: Dmitry Svinkin at Ioffe Institute <svinkin(a)mail.ioffe.ru> D. Svinkin, D. Frederiks, A. Ridnaia, A. Lysenko, on behalf of the IPN, A. Goldstein, M. S. Briggs, C. Wilson-Hodge, and E. Burns on behalf of the Fermi GBM team, and E. Bozzo and C. Ferrigno, on behalf of the INTEGRAL SPI-ACS GRB team, report: The short-duration GRB 240125B (Fermi-GBM detection: The Fermi GBM team, GCN 35634) was detected by Fermi (GBM trigger 727908527), and INTEGRAL (SPI-ACS) at about 74923 s UT (20:48:43). We have triangulated it to a GBM-SPI-ACS annulus centered at RA(2000)=132.059 deg (08h 48m 14s) Dec(2000)=+85.090 deg (+85d 05' 24") whose radius is 34.188 +/- 6.337 deg (3 sigma). The annulus combined with the Fermi-GBM final position (GCN 35634; glg_healpix_all_bn240125867_v00) and the Fermi Earth-occultation information gives 575 sq. deg (3 sigma) localization region. A triangulation map and HEALPix FITS file are posted at http://www.ioffe.ru/LEA/GRBs/GRB240125_T74922/IPN/ View this GCN Circular online at https://gcn.nasa.gov/circulars/35654. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

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[vsnet-grb-info 33505] GRB 240129A: Swift/BAT-GUANO detection of a burst outside the coded FOV
by GCN Circulars 30 Jan '24

30 Jan '24

TITLE: GCN CIRCULAR NUMBER: 35653 SUBJECT: GRB 240129A: Swift/BAT-GUANO detection of a burst outside the coded FOV DATE: 24/01/30 18:32:45 GMT FROM: Jimmy DeLaunay at Penn State <delauj2(a)gmail.com> James DeLaunay (PSU), Samuele Ronchini (PSU), Gayathri Raman (PSU), Aaron Tohuvavohu (U Toronto), Jamie A. Kennea (PSU), Tyler Parsotan (NASA GSFC) report: Swift/BAT did not localize GRB 240129A onboard (T0: 2024-01-29T15:09:22.53 UTC, Fermi trig 728233767) The Fermi 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). Upon 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. The BAT likelihood search, NITRATES (DeLaunay + Tohuvavohu 2022, ApJ, 941, 169), performed on the temporal window [T0-20 s, T0+20 s], detects the burst with a sqrt(TS) of 15.8 in a 16.384 s analysis time bin, starting at T0 - 4.096 s. NITRATES results are consistent with a burst coming from outside the FOV, with DeltaLLHOut of 2.4. See Section 9.1 and Figures 10 and 17 in the NITRATES paper for brief descriptions and interpretation of sqrt(TS), DeltaLLHPeak, and DeltaLLHOut. GUANO 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. A live reporting of Swift/BAT event data recovered by GUANO can be found at: https://www.swift.psu.edu/guano/ View this GCN Circular online at https://gcn.nasa.gov/circulars/35653. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

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[vsnet-grb-info 33504] IPN triangulation of GRB 240125A (short)
by GCN Circulars 29 Jan '24

29 Jan '24

TITLE: GCN CIRCULAR NUMBER: 35652 SUBJECT: IPN triangulation of GRB 240125A (short) DATE: 24/01/29 20:50:21 GMT FROM: Dmitry Svinkin at Ioffe Institute <svinkin(a)mail.ioffe.ru> A.S. Kozyrev, D.V. Golovin, M.L. Litvak, I.G. Mitrofanov, and A.B. Sanin on behalf of the HEND/Mars Odyssey team, D. Svinkin, D. Frederiks, A. Lysenko, A. Ridnaia, and T. Cline on behalf of the Konus-Wind team, G. Waratkar (IITB), J.Joshi (IUCAA), A. Vibhute (IUCAA), V. Bhalerao (IITB), D. Bhattacharya (Ashoka University/IUCAA), A. R. Rao (IUCAA/TIFR), and S. Vadawale (PRL) on behalf of the Astrosat-CZTI team, S. Barthelmy, J. Cummings, H. Krimm, D. Palmer, and A. Tohuvavohu on behalf of the Swift-BAT team, and W. Boynton, C. Fellows, K. Harshman, H. Enos, R. Starr, and A.S. Gardner on on behalf of the GRS-Odyssey GRB team, report: The short-duration GRB 240125A (Glowbug detection: Cheung et al., GCN 35630; AstroSat-CZTI detection: Joshi et al., GCN 35637; CALET-CGBM detection: Marrocchesi et al., GCN 35639; GRBAlpha detection: Dafcikova et al., GCN 35645) was detected by Glowbug, Astrosat (CZTI) Konus-Wind, GRBAlpha, CALET (CGBM) and Mars-Odyssey (HEND) at about 34499 s UT (09:34:59). We have triangulated it to a preliminary, 3 sigma error box whose coordinates are: ------------------------------- RA(2000), deg Dec(2000), deg ------------------------------- Center: 131.528 +66.846 Corners: 147.975 +59.476 147.882 +59.456 92.799 +68.770 93.211 +68.871 -------------------------------- The error box area is 1.85 sq. deg and its maximum dimension is 24.6 deg (the minimum one is 3.3 arcmin). The Sun distance was 132 deg. This localization may be improved. A triangulation map and HEALPix FITS file are posted at http://www.ioffe.ru/LEA/GRBs/GRB240125_T34503/IPN The Konus-Wind time history and spectrum will be given in a forthcoming GCN Circular. View this GCN Circular online at https://gcn.nasa.gov/circulars/35652. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

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[vsnet-grb-info 33503] GRB 240128A: Glowbug gamma-ray detection
by GCN Circulars 29 Jan '24

29 Jan '24

TITLE: GCN CIRCULAR NUMBER: 35651 SUBJECT: GRB 240128A: Glowbug gamma-ray detection DATE: 24/01/29 16:07:31 GMT FROM: C.C. Cheung at Naval Research Lab <Teddy.Cheung(a)nrl.navy.mil> C.C. Cheung, M. Kerr, J.E. Grove, R. Woolf (NRL), A. Goldstein (USRA), C.A. Wilson-Hodge, D. Kocevski (MSFC), and M.S. Briggs (UAH) report: The Glowbug gamma-ray telescope [1,2], operating on the International Space Station, reports the detection of GRB 240128A, which was also detected by MAXI/GSC (GCN 35646), CALET/CGBM (GCN 35647), GRBAlpha (GCN 35649), and INTEGRAL/SPI-ACS (Trigger 10493). Using an adaptive window with a resolution of 32-ms, the burst onset is determined to be 2024-01-28 15:13:35.064 with a duration of 18.4 s and a total significance of about 44.8 sigma. The light curve comprises a multi-peaked structure similar to that observed by CALET/CGBM (GCN 35647). Using a standard power-law function with an exponential high-energy cutoff [3] to model the emission over this duration results in a photon index dN/dE~E^x of x=1.9 and a cutoff energy ("Epeak") of 176 keV. The modeled 10-10000 keV fluence is 2.0e-06 erg/cm^2. The analysis results presented here are preliminary and use a response function that lacks a detailed characterization of the surrounding passive structure of the ISS. Glowbug is a NASA-funded technology demonstrator for sensitive, low-cost gamma-ray transient telescopes developed, built, and operated by the U.S. Naval Research Laboratory (NRL) with support from the University of Alabama in Huntsville, USRA, and NASA MSFC. It was launched on 2023 March 15 aboard the Department of Defense Space Test Program’s STP-H9 to the ISS. The detector comprises 12 large-area (15 cm x 15 cm) CsI:Tl panels covering the surface of a half cube, and two hexagonal (5-cm diameter, 10-cm length) CLLB scintillators, giving it a large field of view (instantaneous FoV ~2/3 sky) over a wide energy band of 50 keV to >2 MeV. [1] Grove, J.E. et al. 2020, Proc. Yamada Conf. LXXI, arXiv:2009.11959 [2] Woolf, R.S. et al. 2022, Proc. SPIE, 12181, id. 121811O [3] Goldstein, A. et al. 2020, ApJ 895, 40, arXiv :1909.03006 Distribution Statement A: Approved for public release. Distribution is unlimited. View this GCN Circular online at https://gcn.nasa.gov/circulars/35651. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

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[vsnet-grb-info 33502] GRB 240128A: Swift-XRT observations
by GCN Circulars 29 Jan '24

29 Jan '24

TITLE: GCN CIRCULAR NUMBER: 35650 SUBJECT: GRB 240128A: Swift-XRT observations DATE: 24/01/29 15:53:21 GMT FROM: Phil Evans at U of Leicester <pae9(a)star.le.ac.uk> M. Perri (SSDC & INAF-OAR), S. Dichiara (PSU), J.A. Kennea (PSU), A. Tohuvavohu (U. Toronto), K.L. Page (U. Leicester), A.P. Beardmore (U. Leicester), V. D'Elia (SSDC & INAF-OAR), B. Sbarufatti (INAF-OAB) and P.A. Evans (U. Leicester) reports on behalf of the Swift-XRT team: Swift-XRT has performed follow-up observations of the MAXI-detected burst GRB 240128A in a series of observations tiled on the sky. The total exposure time is 1.4 ks, distributed over 6 tiles; the maximum exposure at a single sky location was 460 s. The data were collected between T0+46.4 ks and T0+52.4 ks, and are entirely in Photon Counting (PC) mode. One uncatalogued X-ray source has been detected, it is below the RASS limit and shows no definitive signs of fading. Therefore, at the present time we cannot confirm this as the afterglow. Details of this source are given below: Source 1: RA (J2000.0): 140.1536 = 09:20:36.87 Dec (J2000.0): -5.2004 = -05:12:01.5 Error: 8.8 arcsec (radius, 90% conf.) Count-rate: 0.0149 [+0.0080, -0.0059] ct s^-1 Distance: 1224 arcsec from MAXI position. Flux: (2.9 [+1.6, -1.2])e-13 erg cm^-2 s^-1 (observed, 0.3-10 keV) A catalogued source was also detected. The results of the XRT-team automatic analysis of the tiled XRT observations, including a position-specific upper limit calculator, are available at https://www.swift.ac.uk/xrt_products/TILED_GRB00120. This circular is an official product of the Swift-XRT team. View this GCN Circular online at https://gcn.nasa.gov/circulars/35650. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

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[vsnet-grb-info 33501] GRB 240128A: GRBAlpha detection
by GCN Circulars 29 Jan '24

29 Jan '24

TITLE: GCN CIRCULAR NUMBER: 35649 SUBJECT: GRB 240128A: GRBAlpha detection DATE: 24/01/29 15:48:15 GMT FROM: Marianna Dafčíková at Masaryk University <500025(a)mail.muni.cz> M. Dafcikova, J. Ripa (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. Kolar, 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 240128A (MAXI/GSC detection: GCN 35646; CALET/CGBM detection: GCN 35647; INTEGRAL/SPI-ACS trigger no. 10493) was observed by the GRBAlpha 1U CubeSat (Pal et al. 2023, A&A, 677, 40; arXiv:2302.10048). The detection was confirmed at the peak time 2024-01-28 15:13:46 UTC. The T90 duration measured by GRBAlpha is 13 s and the overall significance during T90 reaches 8 sigma. The light curve obtained by GRBAlpha is available here: https://grbalpha.konkoly.hu/static/share/GRB240128A_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/35649. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

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[vsnet-grb-info 33500] GRB 240128A: Tiled Swift observations
by GCN Circulars 29 Jan '24

29 Jan '24

TITLE: GCN CIRCULAR NUMBER: 35648 SUBJECT: GRB 240128A: Tiled Swift observations DATE: 24/01/29 04:07:06 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 series of observations, tiled on the sky, of the MAXI GRB 240128A. Automated analysis of the XRT data will be presented online at http://www.swift.ac.uk/xrt_products/TILED_GRB00120 Any uncatalogued X-ray sources detected in this analysis will be reported on this website and via GCN COUNTERPART notices. The probability of finding serendipitous sources, unrelated to the MAXI event is high: 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/35648. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

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[vsnet-grb-info 33499] GRB 240128A: CALET Gamma-Ray Burst Monitor detection
by GCN Circulars 29 Jan '24

29 Jan '24

TITLE: GCN CIRCULAR NUMBER: 35647 SUBJECT: GRB 240128A: CALET Gamma-Ray Burst Monitor detection DATE: 24/01/28 23:37:46 GMT FROM: Yuta Kawakubo at Louisiana State University <kawakubo1(a)lsu.edu> A. Yoshida, T. Sakamoto, S. Sugita (AGU), Y. Kawakubo (LSU), K. Yamaoka (Nagoya U), S. Nakahira (JAXA), Y. Asaoka (ICRR), S. Torii, Y. Akaike, K. Kobayashi (Waseda U), Y. Shimizu, T. Tamura (Kanagawa U), N. Cannady (GSFC/UMBC), M. L. Cherry (LSU), S. Ricciarini (U of Florence), P. S. Marrocchesi (U of Siena), and the CALET collaboration: The long GRB 240128A (MAXI/GSC detection, Yamaoka et al., GCN Circ. 35646) triggered the CALET Gamma-ray Burst Monitor (CGBM) at 15:13:34.34 UTC on 28 January 2024 (http://cgbm.calet.jp/cgbm_trigger/flight/1390489809/). The burst signal was seen by all CGBM detectors. The burst light curve shows a multi-peaked structure that starts at T+1.4 sec, peaks at T+10.8 sec, and ends at T+15.2 sec. The T90 and T50 durations measured by the SGM data are 12.5 +/- 0.6 sec and 7.2 +/- 0.6 sec (40-1000 keV), respectively. The ground-processed light curve is available at http://cgbm.calet.jp/cgbm_trigger/ground/1390489809/index.html The CALET data used in this analysis are provided by the Waseda CALET Operation Center located at Waseda University. View this GCN Circular online at https://gcn.nasa.gov/circulars/35647. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

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[vsnet-grb-info 33498] GRB 240128A: MAXI/GSC detection
by GCN Circulars 28 Jan '24

28 Jan '24

TITLE: GCN CIRCULAR NUMBER: 35646 SUBJECT: GRB 240128A: MAXI/GSC detection DATE: 24/01/28 22:09:40 GMT FROM: Kazutaka Yamaoka at Nagoya Univ. <yamaoka(a)isee.nagoya-u.ac.jp> K. Yamaoka (Nagoya U.), H. Negoro (Nihon U.), M. Serino (AGU), W. Iwakiri (Chiba U.), M. Nakajima, K. Kobayashi, M. Tanaka, Y. Soejima, Y. Kudo (Nihon U.), T. Mihara, T. Kawamuro, S. Yamada, T. Tamagawa, N. Kawai, M. Matsuoka (RIKEN), T. Sakamoto, S. Sugita, H. Hiramatsu, H. Nishikawa, A. Yoshida (AGU), Y. Tsuboi, S. Urabe, S. Nawa, N. Nemoto, E.Goto (Chuo U.), M. Shidatsu, Y. Niida (Ehime U.), I. Takahashi, M. Niwano, S. Sato, N. Higuchi, Y. Yatsu (Tokyo Tech), S. Nakahira, S. Ueno, H. Tomida, M. Ishikawa, S. Ogawa, T. Kurihara (JAXA), Y. Ueda, K. Setoguchi, T. Yoshitake, Y. Nakatani, Y. Okada (Kyoto U.), M. Yamauchi, Y. Hagiwara, Y. Umeki, Y. Otsuki (Miyazaki U.), Y. Kawakubo (LSU), and M. Sugizaki (NAOC) The MAXI/GSC nova alert system triggered on an uncatalogued X-ray transient source at 15:14:03 UT on January 28, 2024. Because our localization program did not run, we can not provide a precise error region. The source position determined with the nova alert system (Negoro et al. 2016) is (R.A., Dec) = (139.846 deg, -5.053 deg) = (09 19 23.04, -05 03 10.8) (J2000) with an uncertainty of more than 30 arc-min. The burst duration is about 30 sec, and the averaged X-ray flux in the 2-10 keV range was about 600 mCrab. This event was also detected by INTEGRAL SPI-ACS. There was no significant excess flux in the previous transit at 13:37 UT with an upper limit of 20 mCrab. View this GCN Circular online at https://gcn.nasa.gov/circulars/35646. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

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