TITLE: GCN CIRCULAR
NUMBER: 35256
SUBJECT: Konus-Wind detection of GRB 231129C
DATE: 23/12/04 15:14:55 GMT
FROM: Alexandra Lysenko at Ioffe Institute <alexandra.lysenko(a)mail.ioffe.ru>
A. Lysenko, D. Frederiks, A. Ridnaia, D. Svinkin,
A. Tsvetkova, M. Ulanov, and T. Cline
on behalf of the Konus-Wind team, report:
The bright long-duration GRB 231129C
(Fermi-GBM detection: Sharma et al., GCN Circ. 35227;
MAXI/GSC detection: Kawakubo et al., GCN Circ. 35223;
CALET detection: Kawakubo et al., GCN Circ. 35228;
AstroSat CZTI detection: Waratkar et al., GCN Circ. 35230;
GECAM-B detection: Zheng et al., GCN Circ. 35231;
Swift-XRT detection: Gropp et al., GCN Circ. 35234;
Glowbug detection: Cheung et al., GCN Circ. 35235;
GRBAlpha detection: Dafcikova et al., GCN Circ. 35236;
Fermi-LAT detection: Arimoto et al., GCN Circ. 35238;
AGILE detection: Panebianco et al., GCN Circ. 35244)
triggered Konus-Wind at T0=69016.319 s UT (19:10:16.319).
The burst light curve shows a bright, multi-peaked pulse
featuring a very strong hard-to-soft spectral evolution.
The pulse starts at ~T0-0.2 and has a total duration of ~9.6 s.
The emission is seen up to ~15 MeV.
The Konus-Wind light curve of this GRB is available at
http://www.ioffe.ru/LEA/GRBs/GRB231129_T69016/
As observed by Konus-Wind, the burst
had a fluence of 8.60(-0.23,+0.24)x10^-5 erg/cm2,
and a 64-ms peak flux, measured from T0+0.106s,
of 4.16(-0.52,+0.54)x10^-5 erg/cm2/s
(both in the 20 keV - 10 MeV energy range).
The time-averaged spectrum of the burst
(measured from T0 to T0+12.800 s)
is best fit in the 20 keV - 20 MeV range
by the GRB (Band) model with the following parameters:
the low-energy photon index alpha = -0.17(-0.06,+0.06),
the high energy photon index beta = -2.95(-0.12,+0.10),
the peak energy Ep = 202(-6,+6) keV
(chi2 = 151/97 dof).
The spectrum near the maximum count rate
(measured from T0 to T0+0.256 s)
is best fit in the 20 keV - 20 MeV range
by a power law with exponential cutoff model:
dN/dE ~ (E^alpha)*exp(-E*(2+alpha)/Ep)
with alpha = -0.20(-0.14,+0.15)
and Ep = 782(-52,+55) keV (chi2 = 69/51 dof).
Fitting by a GRB (Band) model yields the same alpha and Ep,
and an upper limit on the high energy photon index: beta < -3.3
(chi2 = 69/50 dof).
All the quoted errors are at the 90% confidence level.
All the quoted values are preliminary.
View this GCN Circular online at https://gcn.nasa.gov/circulars/35256.
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TITLE: GCN CIRCULAR
NUMBER: 35255
SUBJECT: IceCube-231202A - IceCube observation of a high-energy neutrino candidate track-like event
DATE: 23/12/04 14:18:52 GMT
FROM: Giacomo Sommani at Ruhr-Universität Bochum <gsommani(a)icecube.wisc.edu>
The IceCube Collaboration (http://icecube.wisc.edu/) reports:
On 2023-12-02 at 17:08:24.09 UT IceCube detected a track-like event with a moderate probability of being of astrophysical origin. The event was selected by the ICECUBE_Astrotrack_Bronze alert stream. The average astrophysical neutrino purity
for Bronze alerts is 30%. This alert has an estimated false alarm rate of 4.4035 events per year due to atmospheric backgrounds. The IceCube detector was in a normal operating state at the time of detection.
After the initial automated alert (https://gcn.gsfc.nasa.gov/notices_amon_g_b/138632_31747601.amon), more sophisticated reconstruction algorithms have been applied offline, with the direction refined to:
Date: 2023-12-02
Time: 17:08:24.09 UT
RA: 139.04 (+1.52, -1.96 deg 90% PSF containment) J2000
Dec: +0.37 (+1.11, -1.40 deg 90% PSF containment) J2000
Deployment of updated software delayed the availability of these results, we apologize for the delay. We encourage follow-up by ground and space-based instruments to help identify a possible astrophysical source for the candidate neutrino.
One gamma-ray source listed in the 4FGL-DR4 Fermi-LAT catalog is inside the 90% uncertainty region. The source is 4FGL J0909.1+0121, located 2.0 deg away from the best-fit position. The source is also listed in the Fermi 3FHL catalog as 3FHL J0909.1+0121.
The IceCube Neutrino Observatory is a cubic-kilometer neutrino detector operating at the geographic South Pole, Antarctica. The IceCube realtime alert point of contact can be reached at roc(a)icecube.wisc.edu
View this GCN Circular online at https://gcn.nasa.gov/circulars/35255.
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TITLE: GCN CIRCULAR
NUMBER: 35254
SUBJECT: Fermi trigger No 723279695: Global MASTER-Net observations report
DATE: 23/12/03 22:31:04 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-SAAO robotic telescope (Global MASTER-Net: http://observ.pereplet.ru, Lipunov et al., 2010, Advances in Astronomy, vol. 2010, 30L) located in South Africa (South African Astronomical Observatory) started inspect of the Fermi GRB231203.29 (trigger No 723279695,15h 58m 43.20s , -49d 46m 12.0s, R=7.12) errorbox 40985 sec after notice time and 41021 sec after trigger time at 2023-12-03 18:25:12 UT, with upper limit up to 16.1 mag. Observations started at twilight. The observations began at zenith distance = 82 deg. The sun altitude is -10.6 deg.
The galactic latitude b = 2 deg., longitude l = 331 deg.
Real time updated cover map and OT discovered available here:
https://master.sai.msu.ru/site/master2/observ.php?id=2322470
We obtain a following upper limits.
Tmid-T0 | Date Time | Site | Coord (J2000) |Filt.| Expt. | Limit| Comment
_________|_____________________|_____________________|____________________________________|_____|_______|_______|________
41051 | 2023-12-03 18:25:12 | MASTER-SAAO | (16h 04m 38.84s , -55d 32m 22.0s) | C | 60 | 13.8 |
41971 | 2023-12-03 18:40:32 | MASTER-SAAO | (16h 26m 22.69s , -57d 26m 40.3s) | C | 60 | 16.0 |
42221 | 2023-12-03 18:44:42 | MASTER-SAAO | (16h 31m 35.93s , -55d 31m 00.8s) | C | 60 | 16.1 |
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/35254.
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TITLE: GCN CIRCULAR
NUMBER: 35251
SUBJECT: GRB 231129C: Swift-XRT afterglow detection
DATE: 23/12/02 14:30:18 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 conducted further observations of the field of the
Fermi/GBM-detected burst GRB 231129C. The observations now extend from
T0+34.8 ks to T0+172.6 ks. The source previously reported, "Source 2",
is believed to be the afterglow. The position of this source is RA,
Dec=11.1769, -81.9936 which is equivalent to:
RA (J2000): 00:44:42.45
Dec(J2000): -81:59:37.0
with an uncertainty of 9.5 arcsec (radius, 90% confidence). This
position is 22.4 arcmin from the Fermi/GBM position. We cannot
determine at the present time whether the source is fading.
The results of the XRT-team automatic analysis are available at
http://www.swift.ac.uk/xrt_products/00021633.
The results of the full analysis of the tiled XRT observations 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/35251.
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TITLE: GCN CIRCULAR
NUMBER: 35249
SUBJECT: GRB 231129C: PROMPT optical upper limits for the MAXI/GSC X-ray counterpart and the MASTER afterglow candidate
DATE: 23/12/01 18:24:28 GMT
FROM: Hank Corbett at UNC,Chapel Hill <htcorbett4(a)gmail.com>
Hank Corbett (University of North Carolina), Kendall Ackley (University of Warwick), Daniel E. Reichart (UNC), Joshua B. Haislip (UNC), Vladimir V. Kouprianov (UNC), Megan Dubay (UNC)
We obtained 2x300s unfiltered exposures of the 90% error region of the MAXI/GSC X-ray transient (Kawakubo et al. GCN 35223) with the 0.8-m PROMPT-7 telescope. Exposures began at 2023-11-30 00:53 UT. Relative to images of the field 24-hours later, we do not detect any new sources within the MAXI/GSC error region with an upper limit of 21.9 calibrated to g-band reference stars from the ATLAS reference catalog (Tonry 2018).
We also observed the position of the MASTER OT detection (Antipov et al, GCN 35240) in a series of unfiltered 6x200s exposures beginning at 2023-12-01 01:56 UT, and do not detect the transient in the stacked image to an upper limit of 22.5. The field also includes the 90% error circle for the Swift XRT candidate at RA 00:44:42.45 Dec -81:59:37.0, and we detect no transient sources to an upper limit of 22.5. We note that the error circle closely aligns with a faint (m_G=19.96) red star (Gaia 4630203649665987840).
Date | Filter | Mag | Exp time (s)
---------------------------------------------------------------
2023-11-30 00:53 UT | Open | > 21.9 @ 5-sigma | 2x300 s
2023-11-30 00:53 UT | Open | > 22.5 @ 5-sigma | 6x200 s
View this GCN Circular online at https://gcn.nasa.gov/circulars/35249.
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TITLE: GCN CIRCULAR
NUMBER: 35248
SUBJECT: GRB 231129A: VZLUSAT-2 detection
DATE: 23/12/01 17:04:23 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 (Hiroshima U.), L. Meszaros, B. Csak (Konkoly Observatory), H. Takahashi (Hiroshima U.), F. Munz , M. Topinka, F. Hroch, N. Husarikova, J.-P. Breuer (Masaryk U.), J. Hudec, J. Kapus, M. Frajt, M. Rezenov (Spacemanic s.r.o), R. Laszlo (Needronix), G. Galgoczi (Wigner Research Center/Eotvos U.), N. Uchida (ISAS/JAXA), T. Enoto (Kyoto U.), Zs. Frei (Eotvos U.), Y. Fukazawa, K. Hirose, H. Matake (Hiroshima U.), S. Hisadomi (Nagoya U.), Y. Ichinohe (Rikkyo U.), L. L. Kiss (Konkoly Observatory), T. Mizuno (Hiroshima U.), K. Nakazawa (Nagoya U.), H. Odaka (Univ of Tokyo), K. Torigoe (Hiroshima U.), P. Svoboda, V. Daniel, J. Dudas, M. Junas, J. Gromes (VZLU), I. Vertat (FEL ZCU) -- the VZLUSAT-2/GRB payload collaboration.
The long-duration GRB 231129A (Swift/BAT detection: GCN 35208; INTEGRAL/IBIS detection: GCN 35209; GECAM-C detection: GCN 35210) was detected by the GRB detector on board of the VZLUSAT-2 3U CubeSat (https://www.vzlusat2.cz/en/).
The data acquisition was performed by the GRB detector unit no. 1. The detection was confirmed at the peak time 2023-11-29 05:06:01 UTC. The T90 duration is 157 s and the significance during T90 reaches 21 sigma.
The light curve obtained by VZLUSAT-2 is available here:
https://vzlusat2.konkoly.hu/static/share/GRB231129A_GCN_VZLUSAT2.pdf
All VZLUSAT-2 detections are listed at: https://monoceros.physics.muni.cz/hea/VZLUSAT-2/
The GRB detectors on VZLUSAT-2 are a demonstration payload for a future CubeSat constellation (Werner et al. Proc. SPIE 2018). Two GRB modules of VZLUSAT-2 are placed in a perpendicular manner and each consists of a 75 x 75 x 5 mm3 CsI scintillator read out by a SiPM array, covering the energy range from ~30 keV to ~1000 keV. VZLUSAT-2 was launched on 2022 January 13 from Cape Canaveral.
View this GCN Circular online at https://gcn.nasa.gov/circulars/35248.
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TITLE: GCN CIRCULAR
NUMBER: 35247
SUBJECT: GRB 231129B: Swift-XRT observations
DATE: 23/12/01 16:04:46 GMT
FROM: Phil Evans at U of Leicester <pae9(a)star.le.ac.uk>
T. Sbarrato (INAF-OAB), A. Tohuvavohu (U. Toronto), D.N. Burrows (PSU),
J. D. Gropp (PSU), J.P. Osborne (U. Leicester), K.L. Page (U.
Leicester), P. D'Avanzo (INAF-OAB), M.G. Bernardini (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 231129B in a series of observations tiled on the sky. The
total exposure time is 2.0 ks, distributed over 7 tiles; the maximum
exposure at a single sky location was 659 s. The data were collected
between T0+12.3 ks and T0+18.0 ks, and are entirely in Photon Counting
(PC) mode.
No X-ray sources have been detected. The 3-sigma upper limit in the
field (not including the regions where the tiles overlap) ranges from
~0.03 to ~0.07 ct s^-1, corresponding to a 0.3-10 keV observed flux of
1.1e-12 to 2.7e-12 erg cm^-2 s^-1 (assuming a typical GRB spectrum).
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_GRB00116.
This circular is an official product of the Swift-XRT team.
View this GCN Circular online at https://gcn.nasa.gov/circulars/35247.
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