November 2023 - vsnet-grb-info - ooruri.kusastro.kyoto-u.ac.jp

[vsnet-grb-info 33093] GRB 231129A: Swift-BAT refined analysis
by GCN Circulars 30 Nov '23

30 Nov '23

TITLE: GCN CIRCULAR NUMBER: 35241 SUBJECT: GRB 231129A: Swift-BAT refined analysis DATE: 23/11/30 22:41:45 GMT FROM: Sibasish Laha at GSFC <sibasish.laha(a)nasa.gov> D. M. Palmer (LANL), S. D. Barthelmy (GSFC), H. A. Krimm (NSF), S. Laha (GSFC/UMBC), A. Y. Lien (U Tampa), C. B. Markwardt (GSFC), M. Moss (GSFC), T. Parsotan (GSFC/UMBC), T. Sakamoto (AGU),M. Stamatikos (OSU) (i.e. the Swift-BAT team): Using the data set from T-61 to T+243 sec from the recent telemetry downlink, we report further analysis of BAT GRB 231129A (trigger #1199764) (Gropp et al., GCN Circ. 35208). The BAT ground-calculated position is RA, Dec = 317.541, 41.530 deg which is RA(J2000) = 21h 10m 09.8s Dec(J2000) = +41d 31' 48.3" with an uncertainty of 1.0 arcmin, (radius, sys+stat, 90% containment). The partial coding was 46%. The BAT light curve shows a complex structure with a duration of ~ 130 sec. T90 (15-350 keV) is 105.46 +- 1.83 sec (estimated error including systematics). The time-averaged spectrum from T-1.75 to T+118.97 sec is best fit by a power law with an exponential cutoff. This fit gives a photon index 1.35 +- 0.17, and Epeak of 83.7 +- 14.6 keV (chi squared 51.44 for 56 d.o.f.). For this model the total fluence in the 15-150 keV band is 1.3 +- 0.0 x 10^-05 erg/cm2 and the 1-sec peak flux measured from T+88.71 sec in the 15-150 keV band is 4.8 +- 0.3 ph/cm2/sec. A fit to a simple power law gives a photon index of 1.78 +- 0.04 (chi squared 70.95 for 57 d.o.f.). All the quoted errors are at the 90% confidence level. The results of the batgrbproduct analysis are available at http://gcn.gsfc.nasa.gov/notices_s/1199764/BA/ View this GCN Circular online at https://gcn.nasa.gov/circulars/35241. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

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[vsnet-grb-info 33092] GRB 231129C: MASTER OT detection
by GCN Circulars 30 Nov '23

30 Nov '23

TITLE: GCN CIRCULAR NUMBER: 35240 SUBJECT: GRB 231129C: MASTER OT detection DATE: 23/11/30 19:18:20 GMT FROM: Vladimir Lipunov at Moscow State U/Krylov Obs <lipunov(a)xray.sai.msu.ru> G.Antipov, V.Lipunov, E.Gorbovskoy (Lomonosov MSU), D.Buckley (SAAO), D.Svinkin (Ioffe Institute, Konus-Wind), Ya.Kechin, K.Zhirkov, A.Kuznetsov, D.Vlasenko, P.Balanutsa, Yu.Tselik, N.Tiurina, I.Gorbunov, V.Vladimirov, D.Zimnukhov, V.Senik, A.Yudin,A.Chasovnikov, D.Cheryasov, A.Sosnovskij (Lomonosov MSU,SAI,PhysicsDepartment), O.A. Gres, N.M. Budnev (Irkutsk State University, API), C.Francile. F. Podesta, R.Podesta (Observatorio Astronomico Felix Aguilar OAFA), R. Rebolo, M. Serra(The Instituto de Astrofisica de Canarias), A. Tlatov, D. Dormidontov (Kislovodsk Solar Station of the Pulkovo Observatory), A. Gabovich, V.Yurkov (Blagoveschensk Educational StateUniversity) MASTER Global robotic net (http://observ.pereplet.ru Lipunov et al.,2010,Advances in Astronomy,2010,30L) started GECAM-B (Ttrigger=2023-11-29 19:10:18.2, Tnotice_socket=2023-11-29 19:11:45.56 Zheng et al. GCN 35231) and Fermi very bright GRB 231129C (Ttrigger=2023-11-29 19:10:18.11, Tnotice_socket=2023-11-29 19:19:40.72 Sharma et al. GCN 35227, GCN 35238, also MAXI-GSC (GCN 35223), CALET (GCN 35228), AstroSat (GCN 35230)) 55 sec after notice time and 90 sec after trigger time at 2023-11-29 19:11:48 UT (Lipunov et al. GCN 35216) by MASTER-SAAO. There is OT source at R.A.,Dec(2000)=00:44:37.97 -81:59:48.75 +-4" with m_OT~17.6 at maximum (unfiltered) at first images with decay inside Swift XRT error-box (Evans et al. GCN 35225, Gropp et al. GCN 35234) Reduction will be continued. View this GCN Circular online at https://gcn.nasa.gov/circulars/35240. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

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[vsnet-grb-info 33091] GRB 231129A: BOOTES-5/JGT optical upper limit
by GCN Circulars 30 Nov '23

30 Nov '23

TITLE: GCN CIRCULAR NUMBER: 35239 SUBJECT: GRB 231129A: BOOTES-5/JGT optical upper limit DATE: 23/11/30 18:49:02 GMT FROM: Youdong HU at IAA-CSIC <huyoudong072(a)hotmail.com> Y.-D. Hu, E. Fernandez-Garcia, A. J. Castro-Tirado, I. Perez-Garcia, M.D. Caballero-Garcia, S.-Y. Wu, R. Sanchez-Ramirez, S. Guziy (IAA-CSIC), D. Hiriart and W. H. Lee (UNAM), C. J. Perez del Pulgar (UMA) and I. M. Carrasco-Garcia (SMA) and I. H. Park (SKKU), on behalf of a larger collaboration, report: Following the detection of GRB 231129A by Swift (Gropp et al. GCNC 35208), INTEGRAL (Mereghetti et al. GCNC 35209) and GECAM-C (Zhang et al. GCNC 35210), the BOOTES-5/JGT 0.6m robotic telescope at Observatorio Astronomico Nacional in San Pedro Martir (Mexico) automatically observed the GRB location starting on Nov. 29, 05:07 UT (~ 61 s after trigger). No new optical source is detected on the co-added image (15 x 10 s, clear filter) within the Swift/XRT error region (Goad et al. GCNC 35220) down to 19.9 mag, which is consistent with reports from MASTER (Lipunov et al. GCNC 35212), Mondy (Belkin et al. GCNC 35232), UVOT (Breeveld et al. GCNC 35233) and JinShan (Liu et al. GCNC 35237). We thank the staff at Observatorio Astronomico Nacional in San Pedro Martir for their excellent support. View this GCN Circular online at https://gcn.nasa.gov/circulars/35239. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

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[vsnet-grb-info 33090] GRB 231129C: Fermi-LAT detection
by GCN Circulars 30 Nov '23

30 Nov '23

TITLE: GCN CIRCULAR NUMBER: 35238 SUBJECT: GRB 231129C: Fermi-LAT detection DATE: 23/11/30 18:39:08 GMT FROM: Nicola Omodei at Stanford University <nicola.omodei(a)gmail.com> M. Arimoto (Kanazawa University), N. Omodei (Stanford University), D. Kocevski (NASA/MSFC) report on behalf of the Fermi-LAT Collaboration: On November 29, 2023 Fermi-LAT detected high-energy emission from GRB 231129C, which was also detected by Fermi-GBM (trigger 722977823 / 231129799, GCN 35221), MAXI-GSC (GCN 35223), CALET (GCN 35228), AstroSat (GCN 35230), GECAM-B (GCN 3523), Glowbug (GCN 35235), and GRBAlpha (GCN 35236). The best LAT on-ground location is found to be R.A., Dec. = 9.1, -81.9 (degrees, J2000) with an error radius of 0.7 deg (90% containment, statistical error only). This was 49 deg from the LAT boresight at the time of the GBM trigger: T0 = 19:10:18.11 UT. The data from the Fermi-LAT show a significant increase in the event rate after the GBM trigger that is spatially correlated with the GBM emission with high significance. The photon flux above 100 MeV in the time interval 0-200 s after the GBM trigger is (3.2 +/- 0.9)E-4 ph/cm2/s. The estimated photon index above 100 MeV is -2.4 +/- 0.4. The highest-energy photon is a 0.7 GeV event which is observed 4 seconds after the GBM trigger. The Fermi-LAT point of contact for this burst is Feraol Fana Dirirsa (ffdirirsa(a)gmail.com) The Fermi-LAT is a pair conversion telescope designed to cover the energy band from 20 MeV to greater than 300 GeV. It is the product of an international collaboration between NASA and DOE in the U.S. and many scientific institutions across France, Italy, Japan and Sweden. View this GCN Circular online at https://gcn.nasa.gov/circulars/35238. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

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[vsnet-grb-info 33089] GRB 231129A: JinShan optical upper limit
by GCN Circulars 30 Nov '23

30 Nov '23

TITLE: GCN CIRCULAR NUMBER: 35237 SUBJECT: GRB 231129A: JinShan optical upper limit DATE: 23/11/30 16:47:03 GMT FROM: Dong Xu at NAOC/CAS <dxu(a)nao.cas.cn> X. Liu, Z.P. Zhu, J. An, S.Q. Jiang, S.Y. Fu, T.H. Lu, D. Xu (NAOC), S.W Luo, M.M. Yang, Z. K. Feng, L.F. Huo (XJTS) report on behalf of a large collaboration: We observed the field of GRB 231129A detected by Swift (J.D. Gropp, GCN 35208), INTEGRAL (S.Mereghetti et al., GCN 35209), and GECAM-C (Wen-Long Zhang et al., GCN 35210), using the 100cm C telescope (100C) located at Altay, Xinjiang, China. Observations started at 12:13:36.29 UT on 2023-11-29, i.e., 7.13 hr after the Swift/BAT trigger, and 30*120s frames are obtained in the Sloan-r band. No credible optical transient is detected in our stacked images within the refined Swift/XRT error region (Burrows et al., GCN 35218), down to a 3-sigma upper limit of r > 21.6 mag, calibrated with nearby PanSTARRS stars and not corrected for Galactic extinction. View this GCN Circular online at https://gcn.nasa.gov/circulars/35237. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

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[vsnet-grb-info 33088] GRB 231129C: GRBAlpha detection
by GCN Circulars 30 Nov '23

30 Nov '23

TITLE: GCN CIRCULAR NUMBER: 35236 SUBJECT: GRB 231129C: GRBAlpha detection DATE: 23/11/30 14:26:15 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.), yyT. 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 bright long-duration GRB 231129C (Fermi/GBM detection: GCN 35217; MAXI/GSC detection: GCN 35223; CALET/CGBM detection: GCN 35228; AstroSat detection: GCN 35230; GECAM-B detection: GCN 35231; INTEGRAL/SPI-ACS peak detection at 2023-11-29 ~19:10:19 UT) 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 2023-11-29 19:10:19 UTC. The T90 duration measured by GRBAlpha is 6 s and the overall significance during T90 reaches 93 sigma. The light curve obtained by GRBAlpha is available here: https://grbalpha.konkoly.hu/static/share/GRB231129C_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/35236. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

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[vsnet-grb-info 33087] GRB 231129C: Glowbug gamma-ray detection
by GCN Circulars 30 Nov '23

30 Nov '23

TITLE: GCN CIRCULAR NUMBER: 35235 SUBJECT: GRB 231129C: Glowbug gamma-ray detection DATE: 23/11/30 14:25:52 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 (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 231129C, which was also detected by Fermi/GBM, MAXI/GSC, CALET, AstroSat/CZTI, and GECAM-B (GCN 35217, 35221, 35222, 35223, 35227, 35228, 35230, 35231). Using an adaptive window with a resolution of 32-ms, the burst onset is determined to be 2023-11-29 19:10:16.184 with a duration of 8.19 s and a total significance of about 116 sigma. The light curve comprises an initial triple-peaked structure from T0 to ~T0+4s, followed by fading emission. 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=1.4 and a cutoff energy ("Epeak") of 349 keV. The modeled 10-10000 keV fluence is 1.5e-05 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/35235. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

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[vsnet-grb-info 33086] GRB 231129C: Swift-XRT observations
by GCN Circulars 30 Nov '23

30 Nov '23

TITLE: GCN CIRCULAR NUMBER: 35234 SUBJECT: GRB 231129C: Swift-XRT observations DATE: 23/11/30 13:59:14 GMT FROM: Phil Evans at U of Leicester <pae9(a)star.le.ac.uk> J. D. Gropp (PSU), S. Dichiara (PSU), K.L. Page (U. Leicester), A.P. Beardmore (U. Leicester), M.G. Bernardini (INAF-OAB), E. Ambrosi (INAF-IASFPA) , M. Capalbi (INAF-IASFPA), J.A. Kennea (PSU) and P.A. Evans (U. Leicester) reports on behalf of the Swift-XRT team: Swift-XRT has performed follow-up observations of the Fermi/GBM-detected burst GRB 231129C in a series of observations tiled on the sky. The total exposure time is 1.5 ks, distributed over 4 tiles; the maximum exposure at a single sky location was 633 s. The data were collected between T0+19.3 ks and T0+35.4 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 2: RA (J2000.0): 11.1769 = 00:44:42.45 Dec (J2000.0): -81.9936 = -81:59:37.0 Error: 9.5 arcsec (radius, 90% conf.) Count-rate: 0.0208 [+0.0113, -0.0084] ct s^-1 Distance: 1341 arcsec from Fermi/GBM position. Flux: (8.6 [+4.7, -3.5])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_GRB00117. This circular is an official product of the Swift-XRT team. View this GCN Circular online at https://gcn.nasa.gov/circulars/35234. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

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[vsnet-grb-info 33085] GRB 231129A: Swift/UVOT Upper Limits
by GCN Circulars 30 Nov '23

30 Nov '23

TITLE: GCN CIRCULAR NUMBER: 35233 SUBJECT: GRB 231129A: Swift/UVOT Upper Limits DATE: 23/11/30 13:17:20 GMT FROM: Alice Breeveld at MSSL-UCL <a.breeveld(a)ucl.ac.uk> A. A. Breeveld (UCL-MSSL) and J. D. Gropp (PSU) report on behalf of the Swift/UVOT team: The Swift/UVOT began settled observations of the field of GRB 231129A (Gropp et al., GCN circ. 35208; Mereghetti et al., GCN circ. 35209; Zhang et al., GCN circ. 35210) 120 s after the BAT trigger (Gropp et al., GCN Circ. 35208). No optical afterglow consistent with the XRT position (Goad et al., GCN Circ. 35220) is detected in the initial UVOT exposures. Preliminary 3-sigma upper limits using the UVOT photometric system (Breeveld et al. 2011, AIP Conf. Proc. 1358, 373) for the first finding chart (FC) exposure and subsequent exposures are: Filter T_start(s) T_stop(s) Exp(s) Mag white_FC 120 270 147 >20.5 white 120 4158 344 >20.8 v 4369 4568 197 >18.9 b 3753 3953 197 >19.4 u 333 5122 275 >19.9 w1 4780 4980 197 >18.8 m2 4574 4773 197 >18.9 w2 4164 4364 197 >19.2 The magnitudes in the table are not corrected for the Galactic extinction due to the reddening of E(B-V) = 1.164 in the direction of the burst (Schlegel et al. 1998). View this GCN Circular online at https://gcn.nasa.gov/circulars/35233. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

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[vsnet-grb-info 33084] GRB 231129A: optical upper limit in Mondy observatory
by GCN Circulars 30 Nov '23

30 Nov '23

TITLE: GCN CIRCULAR NUMBER: 35232 SUBJECT: GRB 231129A: optical upper limit in Mondy observatory DATE: 23/11/30 11:05:26 GMT FROM: Alexei Pozanenko at IKI, Moscow <apozanen(a)iki.rssi.ru> S. Belkin (IKI), E. Klunko (ISTP), A. Pozanenko (IKI), N. Pankov (IKI, HSE) report on behalf of GRB IKI FuN: We observed the field of Swift GRB 231129A (Gropp et al., GCN 35208; Mereghetti et al., GCN 35209; Zhang et al., GCN 35210) with AZT-33IK telescope of Mondy observatory in R-filter on 2023-11-29 starting (UT) 10:43:30. We do not detect any optical objects within the enhanced Swift-XRT error box (Goad et al., GCN 35220). Preliminary photometry of a stacked image is following Date UT start t-T0 Exp. Filter OT Err. UL(3sigma) (mid, days) (s) 2023-11-29 10:43:30 0.25730 33x120 R n/d n/d 23.1 The photometry is based on nearby USNO-B1.0 stars. USNO-B1.0 RA DEC R2 21:10:16.6747200 +41:33:09.000000 17.36 21:10:16.0548000 +41:32:49.822800 18.82 View this GCN Circular online at https://gcn.nasa.gov/circulars/35232. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

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