TITLE: GCN CIRCULAR
NUMBER: 35645
SUBJECT: GRB 240125A: GRBAlpha detection
DATE: 24/01/28 17:29:33 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 short-duration GRB 240125A (Glowbug detection: GCN 35630; AstroSat detection: GCN 35637; CALET/CGBM detection: GCN 35639; Konus/Wind trigger at 2024-01-25 09:35:03.601 UT) was observed by the GRBAlpha 1U CubeSat (Pal et al. 2023, A&A, 677, 40; arXiv:2302.10048).
The subthreshold detection was confirmed at the peak time 2024-01-25 09:35:00 UTC. The T90 duration measured by GRBAlpha is 1 s and the overall significance during T90 reaches 4.4 sigma.
The light curve obtained by GRBAlpha is available here: https://grbalpha.konkoly.hu/static/share/GRB240125A_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/35645.
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TITLE: GCN CIRCULAR
NUMBER: 35644
SUBJECT: Fermi GRB 240127A: Global MASTER-Net observations report
DATE: 24/01/27 19:31:24 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 GRB 240127A ( Fermi GBM team, GCN 35641) errorbox 50416 sec after notice time and 50449 sec after trigger time at 2024-01-27 18:51:29 UT, with upper limit up to 18.4 mag. Observations started at twilight. The observations began at zenith distance = 79 deg. The sun altitude is -13.5 deg.
The galactic latitude b = -32 deg., longitude l = 334 deg.
Real time updated cover map and OT discovered available here:
https://master.sai.msu.ru/site/master2/observ.php?id=2365466
We obtain a following upper limits.
Tmid-T0 | Date Time | Site | Coord (J2000) |Filt.| Expt. | Limit| Comment
_________|_____________________|_____________________|____________________________________|_____|_______|_______|________
50479 | 2024-01-27 18:51:29 | MASTER-SAAO | (21h 13m 34.50s , -48d 04m 39.1s) | C | 60 | 17.2 |
50479 | 2024-01-27 18:51:29 | MASTER-SAAO | (21h 16m 12.91s , -48d 17m 24.0s) | C | 60 | 17.8 |
50559 | 2024-01-27 18:52:49 | MASTER-SAAO | (21h 16m 07.54s , -49d 59m 45.4s) | C | 60 | 17.3 |
50559 | 2024-01-27 18:52:49 | MASTER-SAAO | (21h 18m 52.23s , -50d 12m 29.7s) | C | 60 | 17.8 |
50719 | 2024-01-27 18:55:29 | MASTER-SAAO | (21h 07m 19.93s , -55d 42m 11.5s) | C | 60 | 17.8 |
50719 | 2024-01-27 18:55:29 | MASTER-SAAO | (21h 10m 27.84s , -55d 54m 56.1s) | C | 60 | 18.3 |
50878 | 2024-01-27 18:58:08 | MASTER-SAAO | (21h 20m 12.47s , -51d 53m 49.9s) | C | 60 | 17.8 |
50878 | 2024-01-27 18:58:08 | MASTER-SAAO | (21h 23m 04.13s , -52d 06m 33.9s) | C | 60 | 18.4 |
50957 | 2024-01-27 18:59:27 | MASTER-SAAO | (19h 58m 01.24s , -59d 27m 21.3s) | 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/35644.
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TITLE: GCN CIRCULAR
NUMBER: 35643
SUBJECT: GRB 240123C: GRBAlpha detection
DATE: 24/01/27 16:19:42 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 short-duration GRB 240123C (AstroSat detection: GCN 35635; INTEGRAL/SPI-ACS peak detection at 2024-01-23 ~23:12:37) 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 2024-01-23 23:12:37 UTC. The T90 duration measured by GRBAlpha is 2 s and the overall significance during T90 reaches 12 sigma.
The light curve obtained by GRBAlpha is available here: https://grbalpha.konkoly.hu/static/share/GRB240123C_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/35643.
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TITLE: GCN CIRCULAR
NUMBER: 35642
SUBJECT: GRB 240122A: ATCA detection of radio counterpart
DATE: 24/01/27 06:27:28 GMT
FROM: Gemma Anderson at Curtin U <gemma.anderson(a)curtin.edu.au>
G. E. Anderson (Curtin), A. Gulati (USyd), L. Rhodes (Oxford), J. K. Leung (UofT/HUJI), A. J. van der Horst (GWU), S. Chastain (UNM) on behalf of the PanRadio GRB collaboration
The Australia Telescope Compact Array (ATCA) observed the MAXI-detected long GRB 240122A (Negoro et al., GCN 35593) at the GOTO (Kumar et al., GCN 35596) and Swift-XRT localisation (Ambrosi et al., GCN 35600) as part of the Large ATCA "PanRadio GRB" follow-up program C3542 (PI. Anderson).
The observation took place on 2024-01-24 at 12:00 UT for 2.5 hours at 5.5 and 9 GHz. We detected a candidate radio afterglow at 9 GHz consistent with the GOTO and XRT position with a preliminary flux density of ~160 microJy with a RMS sensitivity of 20 microJy, and obtained a 3 sigma upper limit of 135 microJy at 5.5 GHz.
Further observations are planned.
We thank the CSIRO Space and Astronomy staff for supporting these observations.
We acknowledge the Gomeroi people as the traditional owners of the Observatory site. The Australia Telescope Compact Array is part of the Australia Telescope National Facility (https://ror.org/05qajvd42) which is funded by the Australian Government for operation as a National Facility managed by CSIRO.
View this GCN Circular online at https://gcn.nasa.gov/circulars/35642.
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TITLE: GCN CIRCULAR
NUMBER: 35640
SUBJECT: IceCube-240123A: Upper limits from a search for additional neutrino events in IceCube
DATE: 24/01/27 02:26:57 GMT
FROM: Jessie Thwaites at IceCube/U Wisc-Madison <thwaites(a)wisc.edu>
The IceCube Collaboration (http://icecube.wisc.edu/) reports:
IceCube has performed a search [1] for additional track-like muon neutrino events arriving from the direction of IceCube-240123A (https://gcn.nasa.gov/circulars/35604) in a time range of 1000 seconds centered on the alert event time (2024-01-23 11:17:16.050 UTC to 2024-01-23 11:33:56.050 UTC) during which IceCube was collecting good quality data. Excluding the event that prompted the alert, zero track-like events are found within the 90% containment region of IceCube-240123A. The IceCube sensitivity to neutrino point sources with an E^-2.5 spectrum (E^2 dN/dE at 1 TeV) within the locations spanned by the 90% spatial containment region of IceCube-240123A is 1.4e-01 GeV cm^-2 in a 1000 second time window. 90% of events IceCube would detect from a source at this declination with an E^-2.5 spectrum have energies in the approximate energy range between 3e+02 GeV and 1e+05 GeV.
A subsequent search was performed including 2 days of data centered on the alert event time (2024-01-22 11:25:36.050 UTC to 2024-01-24 11:25:36.050 UTC). In this case, we report a p-value of 0.08, consistent with no significant excess of track events. The IceCube sensitivity to neutrino point sources with an E^-2.5 spectrum (E^2 dN/dE at 1 TeV) within the locations spanned by the 90% spatial containment region of IceCube-240123A is 1.6e-01 GeV cm^-2 in a 2 day time window.
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.
[1] IceCube Collaboration, R. Abbasi et al., ApJ 910 4 (2021)
View this GCN Circular online at https://gcn.nasa.gov/circulars/35640.
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TITLE: GCN CIRCULAR
NUMBER: 35639
SUBJECT: GRB 240125A: CALET Gamma-Ray Burst Monitor detection
DATE: 24/01/27 00:35:22 GMT
FROM: Yuta Kawakubo at Louisiana State University <kawakubo1(a)lsu.edu>
P. S. Marrocchesi (U of Siena), 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),
and the CALET collaboration:
The short GRB 240125A (Glowbug gamma-ray detection:
Cheung et al., GCN Circ. 35630; AstroSat CZTI detection:
Joshi et al., GCN Circ. 35637) triggered the CALET Gamma-ray
Burst Monitor (CGBM) at 09:34:58.79 UTC on 25 January 2024
(http://cgbm.calet.jp/cgbm_trigger/flight/1390210300/).
The burst signal was seen by all CGBM detectors.
The burst light curve shows a triple-peaked structure that
starts at T+0.50 sec, peaks at T+1.02 sec, and ends at T+1.65 sec.
The T90 and T50 durations measured by the SGM data are
1.10 +/- 0.05 sec and 0.65 +/- 0.11 sec (40-1000 keV), respectively.
The ground-processed light curve is available at
http://cgbm.calet.jp/cgbm_trigger/ground/1390210300/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/35639.
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TITLE: GCN CIRCULAR
NUMBER: 35638
SUBJECT: Swift Trigger 1211211 and 1211212 are not astrophysical
DATE: 24/01/26 20:13:05 GMT
FROM: Boris Sbarufatti at INAF-OAB <boris.sbarufatti(a)inaf.it>
P. D'Avanzo (INAF-OAB), M. Ferro (INAF-OAB), J.D. Gropp (PSU),
A. Y. Lien (U Tampa), T. M. Parsotan (GSFC), C. Salvaggio (INAF-OAB),
T. Sbarrato (INAF-OAB) and B. Sbarufatti (INAF-OAB) report on behalf
of the Neil Gehrels Swift Observatory Team:
Swift triggers 1211211 and 1211212 were caused by a star track
loss-of-lock event, and are not interesting events.
View this GCN Circular online at https://gcn.nasa.gov/circulars/35638.
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TITLE: GCN CIRCULAR
NUMBER: 35637
SUBJECT: GRB 240125A: AstroSat CZTI detection of a short burst
DATE: 24/01/26 08:30:34 GMT
FROM: Gaurav Waratkar at IIT Bombay <gauravwaratkar(a)iitb.ac.in>
J.Joshi (IUCAA), G. Waratkar (IITB), A. Vibhute (IUCAA), V. Bhalerao (IITB), D. Bhattacharya (Ashoka University/IUCAA), A. R. Rao (IUCAA/TIFR), and S. Vadawale (PRL) report on behalf of the AstroSat CZTI collaboration:
Analysis of AstroSat CZTI data with the CIFT framework (Sharma et al., 2021, JApA, 42, 73) showed the detection of a short-duration GRB 240125A which was also detected by Glowbug (C.C. Cheung, GCN Circ. 35630).
The source was clearly detected in the CZT detectors in the 20-200 keV energy range. The light curve peaks at 2024-01-25 09:35:00.35 UTC. The measured peak count rate associated with the burst is 287 (+139, -40) counts/s above the background in the combined data of three quadrants (out of four), with a total of 208 (+50, -50) counts. The local mean background count rate was 263 (+7, -10) counts/s. Using cumulative rates, we measure a T90 of 1.4 (+0.11, -0.47) s.
The source was also detected in the CsI anticoincidence (Veto) detector in the 100-500 keV energy range. The light curve peaks at 2024-01-23 09:34:58.75UTC. The measured peak count rate associated with the burst is 532 (+74, -81) counts/s above the background in the combined data of all quadrants, with a total of 1132 (+156, -172) counts. The local mean background count rate was 1587 (+5, -6) counts/s. Due to the intrinsic 1 s binning of veto data, we cannot reliably estimate a T90 from it.
CZTI is built by a TIFR-led consortium of institutes across India, including VSSC, URSC, IUCAA, SAC, and PRL. The Indian Space Research Organisation funded, managed, and facilitated the project.
CZTI GRB detections are reported regularly on the payload site at:
http://astrosat.iucaa.in/czti/?q=grb
View this GCN Circular online at https://gcn.nasa.gov/circulars/35637.
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TITLE: GCN CIRCULAR
NUMBER: 35636
SUBJECT: GRB 240124B: AstroSat CZTI detection
DATE: 24/01/26 08:28:51 GMT
FROM: Gaurav Waratkar at IIT Bombay <gauravwaratkar(a)iitb.ac.in>
J. Joshi (IUCAA), G. Waratkar (IITB), A. Vibhute (IUCAA), V. Bhalerao (IITB), D. Bhattacharya (Ashoka University/IUCAA), A. R. Rao (IUCAA/TIFR), and S. Vadawale (PRL) report on behalf of the AstroSat CZTI collaboration:
Analysis of AstroSat CZTI data with the CIFT framework (Sharma et al., 2021, JApA, 42, 73) showed the detection of GRB 240124B. We also inspected INTEGRAL/SPI-ACS data, and see a detection there.
The source was clearly detected in the CZT detectors in the 20-200 keV energy range. The light curve peaks at 2024-01-24 21:14:33.25 UTC. The measured peak count rate associated with the burst is 386 (+141, -69) counts/s above the background in the combined data of three quadrants (out of four), with a total of 322 (+81, -76) counts. The local mean background count rate was 257 (+5, -10) counts/s. Using cumulative rates, we measure a T90 of 2.35 (+0.34, -0.9) s.
The source was also detected in the CsI anticoincidence (Veto) detector in the 100-500 keV energy range. The light curve peaks at 2024-01-23 21:14:31.78 UTC. The measured peak count rate associated with the burst is 710 (+72, -80) counts/s above the background in the combined data of all quadrants, with a total of 1164 (+159, -179) counts. The local mean background count rate was 1303 (+6, -8) counts/s. Due to the intrinsic 1 s binning of veto data, we cannot reliably estimate a T90 from it.
CZTI is built by a TIFR-led consortium of institutes across India, including VSSC, URSC, IUCAA, SAC, and PRL. The Indian Space Research Organisation funded, managed, and facilitated the project.
CZTI GRB detections are reported regularly on the payload site at:
http://astrosat.iucaa.in/czti/?q=grb
View this GCN Circular online at https://gcn.nasa.gov/circulars/35636.
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