GRB 240929A
GCN Circular 37627
Subject
GRB 240929A: Fermi GBM Final Real-time Localization
Date
2024-09-29T20:00:32Z (8 months ago)
From
Fermi GBM Team at MSFC/Fermi-GBM <do_not_reply@GIOC.nsstc.nasa.gov>
Via
email
The Fermi GBM team reports the detection of a likely LONG GRB
At 19:50:04 UT on 29 Sep 2024, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 240929A (trigger 749332209.094252 / 240929826).
The on-ground calculated location, using the Fermi GBM trigger data, is RA = 356.1, Dec = 75.0 (J2000 degrees, equivalent to J2000 23h 44m, 75d 00'), with a statistical uncertainty of 1.4 degrees.
The angle from the Fermi LAT boresight is 108.0 degrees.
The skymap can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2024/bn240929826/quicklook/glg_skymap_all_bn240929826.png
The HEALPix FITS file, including the estimated localization systematic, can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2024/bn240929826/quicklook/glg_healpix_all_bn240929826.fit
The GBM light curve can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2024/bn240929826/quicklook/glg_lc_medres34_bn240929826.gif
GCN Circular 37628
Subject
Fermi GRB 240929A: Global MASTER-Net observations report
Date
2024-09-29T20:30:35Z (8 months ago)
From
Vladimir Lipunov at Moscow State U/Krylov Obs <lipunov@xray.sai.msu.ru>
Via
legacy email
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 240929A ( Fermi GBM team, GCN 37627) errorbox 21 sec after notice time and 55 sec after trigger time at 2024-09-29 19:50:59 UT, with upper limit up to 17.9 mag. The observations began at zenith distance = 32 deg. The sun altitude is -43.0 deg.
The galactic latitude b = 13 deg., longitude l = 119 deg.
Real time updated cover map and OT discovered available here:
https://master.sai.msu.ru/site/master2/observ.php?id=2619216
We obtain a following upper limits.
Tmid-T0 | Date Time | Site | Coord (J2000) |Filt.| Expt. | Limit| Comment
_________|_____________________|_____________________|____________________________________|_____|_______|_______|________
60 | 2024-09-29 19:50:59 | MASTER-Tavrida | (00h 07m 38.65s , +74d 41m 45.4s) | P/ | 10 | 15.9 |
378 | 2024-09-29 19:55:47 | MASTER-Tavrida | (00h 07m 39.07s , +74d 41m 46.6s) | P/ | 70 | 17.1 |
520 | 2024-09-29 19:57:59 | MASTER-Tavrida | (00h 07m 38.99s , +74d 41m 46.3s) | P/ | 90 | 17.3 |
692 | 2024-09-29 20:00:30 | MASTER-Tavrida | (00h 07m 38.85s , +74d 41m 45.2s) | P/ | 130 | 17.7 |
898 | 2024-09-29 20:03:42 | MASTER-Tavrida | (00h 07m 38.77s , +74d 41m 43.8s) | P/ | 160 | 17.6 |
1130 | 2024-09-29 20:07:24 | MASTER-Tavrida | (00h 07m 38.90s , +74d 41m 43.2s) | P/ | 180 | 17.6 |
1373 | 2024-09-29 20:11:27 | MASTER-Tavrida | (00h 07m 39.18s , +74d 41m 43.7s) | P/ | 180 | 17.8 |
1616 | 2024-09-29 20:15:29 | MASTER-Tavrida | (00h 07m 39.36s , +74d 41m 45.4s) | P/ | 180 | 17.7 |
1859 | 2024-09-29 20:19:33 | MASTER-Tavrida | (00h 07m 39.49s , +74d 41m 48.9s) | P/ | 180 | 17.9 |
The observation and reduction will continue.
The message may be cited.
GCN Circular 37629
Subject
GRB 240929A: BALROG localization (Fermi Trigger 749332209 / GRB 240929826)
Date
2024-09-29T20:37:46Z (8 months ago)
From
Jochen Greiner at MPE <jcgrog@mpe.mpg.de>
Via
email
T. Preis, B. Biltzinger, J. Burgess & J. Greiner (all MPE Garching) report:
The public trigdat data of the Fermi Gamma-ray Burst Monitor (GBM) trigger
749332209 at 19:50:04 on 29 Sept. 2024 were automatically fitted for spectrum
and sky location with BALROG (Burgess et al. 2018, MNRAS 476, 1427;
Berlato et al. 2019, ApJ 873, 60).
The best-fit position is:
RA(2000.0) = 359.0 deg
Decl.(2000.0) = 75.4 deg
The 1 sigma statistical error radius is 2.5 deg.
We estimate an additional systematic error of 1 deg.
Further details are available at:
https://grb.mpe.mpg.de/grb/GRB240929826/
The Healpix map can be downloaded from:
https://grb.mpe.mpg.de/grb/GRB240929826/healpix
The location parameters are available as JSON at:
https://grb.mpe.mpg.de/grb/GRB240929826/json
GCN Circular 37630
Subject
GRB 240929A long GRB detected by INTEGRAL
Date
2024-09-29T21:00:52Z (8 months ago)
From
Sandro Mereghetti at IASF-Milano/INAF <sandro.mereghetti@inaf.it>
Via
Web form
S.Mereghetti (INAF, IASF-Milano), D.Gotz (CEA, Saclay), C.Ferrigno, E.Bozzo, V.Savchenko (ISDC, Versoix), L.Ducci (IAAT, Germany and ISDC, Versoix) and J.Borkowski (CAMK, Torun) report:
a gamma ray burst lasting about 20 s has been detected by IBAS in the IBIS/ISGRI data at 19:50:02 UT of 2024 September 29.
The refined coordinates (J2000) are:
R.A.= 2.4233 deg
DEC.= 74.8275 deg
with an uncertainty of 2 arcmin (90% c.l.).
A preliminary analysis gives a peak flux of about 5 ph/cm2/s (20-200 keV, 1-s integration time) and a fluence in the same energy range of about 3e-6 erg/cmq.
Due to telemetry saturation, these values should be considered as lower limits.
This burst has also been detected by Fermi/GBM (GCN 37627).
A plot of the light curve will be posted at
http://ibas.iasf-milano.inaf.it/IBAS_Results.html
GCN Circular 37642
Subject
GRB 240929A : Leavitt Observatory optical upper limit
Date
2024-09-30T19:52:37Z (8 months ago)
From
leavittob@gmail.com
Via
Web form
L. Moretti and E. Pavoni (Leavitt Observatory, Italy),
Members of:
GRB/UAI - Gamma ray Burst section of Unione Astrofili Italiani.
ATA - Associazione Tuscolana di Astronomia.
In a large collaboration with:
M.G. Dainotti (National Astronomical Observatory of Japan),
Y. Niino (Tokyo University, Institute of Astronomy),
K. Kalinowski (Aarhus University, Department of Physics and Astronomy),
B. De Simone (Universita' degli Studi Di Salerno)
report:
We imaged the field of GRB 240929A detected by INTEGRAL (Fermi GBM Team, GCN 37627; Lipunov et al., GCN 37628; Preis et al., GCN 37629; Mereghetti et al., GCN 37630), with the RC telescope (D=250 mm, F/D=8) of Leavitt Observatory, Italy.
The observations started at 20:17:40 UT on 2024-09-29, i.e. about 27 min. after the INTEGRAL trigger, at the following position:
RA(J2000) = 00h 09m 42s
Dec(J2000) = 74° 49' 39"
Weather conditions were good.
We co-added 27 exposures of 120 sec each (total 54 min).
We did not found any optical counterpart in the error box (2 arcmin) of INTEGRAL, with the following upper limit:
Start End Limit
2024-09-29T20:17:40 2024-09-29T21:10:53 > 20.9
Magnitudes were estimated with the BP-band of Gaia DR3 catalogue (*) and are not corrected for galactic dust extinction.
Reference:
https://leavittobservatory.altervista.org
The message may be cited.
(*) https://gea.esac.esa.int/archive/documentation/GEDR3/Data_processing/chap_cu5pho/cu5pho_sec_photSystem/cu5pho_ssec_photRelations.html
GCN Circular 37650
Subject
GRB 240929A: SVOM/GRM observation
Date
2024-10-01T07:17:44Z (8 months ago)
From
zhengchao_astro@foxmail.com
Via
Web form
SVOM/GRM team: Chao Zheng, Chen-Wei Wang, Shi-Jie Zheng, Yong-Wei Dong, Jiang-Tao Liu, Jian-Chao Sun, Yue Huang, Jiang He, Min Gao, Hao-Xuan Guo, Lu Li, Yong-Ye Li, Hong-Wei Liu, Xin Liu, Hao-Li Shi, Li-Ming Song, You-Li Tuo, Wen-Jun Tan, Wen-Long Zhang, Hao-Xi Wang, Jin Wang, Jin-Zhou Wang, Ping Wang, Rui-Jie Wang, Yu-Xi Wang, Bo-Bing Wu, Shao-Lin Xiong, Jian-Ying Ye, Yi-Tao Yin, Wen-Hui Yu, Fan Zhang, Li Zhang, Peng Zhang, Shuang-Nan Zhang, Yan-Ting Zhang, Yan-Qiu Zhang, Shu-Min Zhao, Xiao-Yun Zhao (IHEP), Maria-Grazia Bernardini (LUPM/INAF-OAB), Laurent Bouchet (IRAP), David Corre (CEA), Tais Maiolino (LUPM), Frédéric Piron (LUPM), Stéphane Schanne (CEA), Jingwei Wang (IAP)
SVOM JSWG: Jian-Yan Wei (NAOC), Bertrand Cordier (CEA), Shuang-Nan Zhang (IHEP), Stéphane Basa (LAM), Shao-Lin Xiong (IHEP), Jean-Luc Attéia (IRAP), Arnaud Claret (CEA), Zi-Gao Dai (USTC), Frédéric Daigne (IAP), Jin-Song Deng (NAOC), Andrea Goldwurm (APC), Diego Götz (CEA), Xu-Hui Han (NAOC), Cyril Lachaud (APC), En-Wei Liang (GXU), Yu-Lei Qiu (NAOC), Susanna Vergani (Obs.Paris), Jing Wang (NAOC), Chao Wu (NAOC), Li-Ping Xin (NAOC), Bing Zhang (UNLV)
report on behalf of the SVOM team:
During the commissioning phase, the SVOM/GRM was triggered in-flight by a long GRB 240929A (SVOM trigger reference: sb 24092904) at 2024-09-29T19:50:08.000 UT (T0), which also triggered Fermi/GBM (Fermi GBM team, GCN 37627) and INTEGRAL IBAS (S.Mereghetti et al., GCN 37630).
With the event-by-event data downloaded through the X-band ground station, the GRM light curve shows that this burst consists of multiple pulses with a duration of about 17 s.
The GRM light curve can be found here:
https://www.bursthub.cn//admin/static/svgrb240929A.png
ECLAIRs was not collecting data at the time of the burst.
The Space Variable Objects Monitor (SVOM) is a China-France joint mission led by the Chinese National Space Administration (CNSA, China), National Center for Space Studies (CNES, France) and the Chinese Academy of Sciences (CAS, China), which is dedicated to observing gamma-ray bursts and other transient phenomena in the energetic universe. GRM is developed by the Institute of High Energy Physics (IHEP) of CAS.
The SVOM point of contact for this burst is: Chao Zheng (IHEP)(zhengchao97@ihep.ac.cn)
GCN Circular 37657
Subject
GRB 240929A: GRBAlpha detection
Date
2024-10-01T18:54:34Z (8 months ago)
From
Marianna Dafčíková at Masaryk University <500025@mail.muni.cz>
Via
Web form
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 240929A (Fermi/GBM detection: GCN 37627; INTEGRAL/IBAS detection: GCN 37630; SVOM/GRM detection: GCN 37650; INTEGRAL/SPI-ACS peak detection at 2024-09-29 ~19:50:05 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 2024-09-29 19:50:08.6 UTC. The T90 duration measured by GRBAlpha is 12.5 s and the overall significance during T90 reaches 22 sigma.
The light curve obtained by GRBAlpha is available here: https://grbalpha.konkoly.hu/static/share/GRB240929A_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.
GCN Circular 37672
Subject
GRB 240929A: Liverpool Telescope prompt followup observations
Date
2024-10-02T09:05:13Z (8 months ago)
From
Cristiano Guidorzi at Ferrara U,Italy <guidorzi@fe.infn.it>
Via
Web form
C. Guidorzi (U. Ferrara), R. Smith (LJMU), A. Gomboc (U. Nova Gorica), C.J. Mottram, I.A. Steele (LJMU) report:
The 2-m robotic Liverpool Telescope automatically started observing with the MOPTOP polarimeter GRB 240929A detected by Fermi, INTEGRAL, SVOM, GRBAlpha (Fermi GBM team, GCN 37627; Mereghetti et al. GCN 37630; SVOM team, GCN 37650; Dafcikova et al., GCN 37657) at 19:54:06 UT, that is 242 s after the Fermi/GBM trigger time. In a 64x4s stacked frame in the MOP-R filter from 242 to 405 s since the Fermi/GBM trigger time, we do not find any uncatalogued object down to R>19.5 mag within the INTEGRAL error circle (Mereghetti et al.), as calibrated against Pan-STARRS catalog field stars.
GCN Circular 37689
Subject
GRB 240929A: SAO RAS, Mondy, and CrAO optical observations
Date
2024-10-03T09:38:25Z (8 months ago)
From
Alexei Pozanenko at IKI, Moscow <apozanen@iki.rssi.ru>
Via
legacy email
N. Pankov (HSE, IKI), A. Moskvitin (SAO), E. Klunko (ISTP), V. Rumyantsev (CrAO), A. Pozanenko (IKI), I. Spiridonova (SAO), S. Belkin (HSE, IKI) report on behalf of IKI GRB FuN:
We observed the field of long GRB 240929A detected by INTEGRAL (Mereghetti et al., GCN 37630) and aslso detected by Fermi GBM (Fermi GBM team, GCN 37627; Preis et al., GCN 37629), SVOM (Zheng et al., GCN 37650), and GRBAlpha (Dafcikova et al., GCN 37657) with Zeiss-1000 1.0-meter telescope (equipped with EEV CCD42-40 and the Rc-filter) of SAO RAS observatory, AZT-33IK 1.5-meter telescope (equipped with ANDOR NEO CMOS camera and the R-filter) of Mondy observatory, and ZTSh 2.6-meter telescope (equipped with FLI ProLine PL4240 CCD and the R-filter) of CrAO. The observations began at SAO RAS on 2024-09-30 19:42:11 UT. Details of the observations are as follows:
Date UTstart t-T0 Exp. Filter UL Telesope
(mid, days) (n*s) (3sigma)
2024-09-29 22:46:17 0.138546 8*300 Rc 23.4 Zeiss-1000
2024-09-30 19:47:17 1.017543 28*120 R 22.0 AZT-33IK
2024-10-01 18:49:59 1.975663 50*120 R 24.0 ZTSh
Within the INTEGRAL localization circle (Mereghetti et al., GCN 37630) we found no variable sources. Additionally we found several sources which are absent in PS1 catalog but detected in the stacked image of initial Zeiss-1000 observations. All of the sources is barely visible in PS1 images. The table below shows the coordinates of the sources and the R mag obtained for the sources in these three epochs.
Source# RA(J2000) Dec(J2000) m(Sep.29) m(Sep.30) m(Oct.01)
1 00:09:34.87 +74:49:05.2 20.95±0.12 20.88±0.16 20.73±0.03
2 00:09:35.74 +74:48:55.1 21.83±0.16 >22 21.86±0.08
3 00:09:36.67 +74:50:37.0 21.45±0.15 21.58±0.20 21.51±0.06
4 00:09:36.70 +74:49:07.7 21.35±0.10 21.60±0.23 21.37±0.04
5 00:09:41.59 +74:48:24.1 21.00±0.11 20.70±0.15 20.66±0.03
6 00:09:41.98 +74:49:32.5 22.15±0.16 ~21.6 21.86±0.04
7 00:09:57.12 +74:50:11.0 21.73±0.12 ~21.7 21.78±0.07
8 00:09:58.78 +74:50:05.3 21.80±0.19 ~21.8 22.10±0.07
9 00:10:07.25 +74:50:21.8 21.80±0.15 ~21.8 22.08±0.07
10 00:10:08.93 +74:49:57.4 21.38±0.11 21.84±0.26 21.53±0.04
The magnitudes were calibrated against nearby USNO-B1.0 (R2) reference stars and are not corrected for the Galactic extinction. No variability was found among the sources. So we have no evident GRB240929A afterglow candidates, which is in agreement with previously reported observations (Lipunov et al., GCN 37628; Moretti & Pavoni, GCN 37642; Guidorzi et al., GCN 37672).