GRB 240810A
GCN Circular 37172
Subject
Konus-Wind detection of GRB 240810A
Date
2024-08-13T10:09:19Z (a year ago)
From
Anna Ridnaia at Ioffe Institute <ridnaia@mail.ioffe.ru>
Via
Web form
A. Ridnaia, D. Frederiks, A. Lysenko, D. Svinkin,
A. Tsvetkova, M. Ulanov, and T. Cline,
on behalf of the Konus-Wind team, report:
The short-duration GRB 240810A
(Fermi-GBM detection: The Fermi GBM team, GCN 37133;
IPN triangulation: Kozyrev et al., GCN 37156;
SVOM-GRM observation: Sun et al., GCN 37166)
triggered Konus-Wind at T0=76037.735 s UT (21:07:17.735).
The burst light curve shows two separated emission episodes.
The initial, hard episode starts at ~T0-0.048 s and has
a duration of ~0.1 s. The second, softer episode
starts at ~T0+0.768 s and ends at ~T0+1.2 s.
The total burst duration is ~1.25 s.
The Konus-Wind light curve of this GRB is available at
http://www.ioffe.ru/LEA/GRBs/GRB240810_T76037/
As observed by Konus-Wind, the burst
had a fluence of 1.10(-0.09,+0.42)x10^-6 erg/cm2,
and a 16-ms peak flux, measured from T0-0.032 s,
of 9.59(-1.77,+3.95)x10^-6 erg/cm2/s
(both in the 20 keV - 10 MeV energy range).
Since the brightest peak of the burst light curve
was detected before the trigger, the spectral analysis
was performed using the KW 3-channel light curve data.
Modelling the KW 3-channel time-integrated spectrum
(measured from T0-0.048 s to T0+1.200 s)
by a power law with exponential cutoff (CPL) model:
dN/dE ~ (E^alpha)*exp(-E*(2+alpha)/Ep),
yields alpha = -0.90(-0.21,+0.26) and Ep = 383(-99,+165) keV.
Modelling the KW 3-channel spectrum near the peak count rate
(measured from T0-0.048 to T0+0.050 s)
by a power law with exponential cutoff (CPL) model
yields alpha = -0.35(-0.24,+0.26) and Ep = 546(-99,+139) keV.
All the quoted errors are at the 68% confidence level.
All the quoted values are preliminary.
GCN Circular 37166
Subject
GRB 240810A: SVOM/GRM observation
Date
2024-08-13T01:07:37Z (a year ago)
From
Jianchao Sun at IHEP <sunjc@ihep.ac.cn>
Via
Web form
SVOM/GRM team: Jian-Chao Sun, Yue Huang, Yong-Wei Dong, Jiang-Tao Liu, Shi-Jie Zheng, Jiang He, Chen-Wei Wang, Wen-Jun tan, Min Gao, Hao-Xuan Guo, Lu Li, Yong-Ye Li, Hong-Wei Liu, Xin Liu, Hao-Li Shi, Li-Ming Song, You-Li Tuo, 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, Wen-Long Zhang, Yan-Ting Zhang, Shu-Min Zhao, Xiao-Yun Zhao, Chao Zheng (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), JeanLuc 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 GRB 240810A (SVOM trigger reference: sb24081009) at 2024-08-10T21:07:19.900 UT (T0), which was also observed by Fermi/GBM (GCN 37133).
The real-time alert data and light curves of SVOM/GRM were downlinked to the ground through the VHF system with low latency. The light curves show that this burst consists of a single pulse with a duration of about 1 s.
The GRM light curve can be found here:
https://www.bursthub.cn/admin/static/svgrb240810A.png
At the time of this burst, SVOM/ECLAIRs was in operation but the burst position (from Fermi/GBM) was outside the ECLAIRs FoV.
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: Jian-Chao Sun (IHEP)(sunjc@ihep.ac.cn)
GCN Circular 37156
Subject
IPN triangulation of GRB 240810A (short)
Date
2024-08-12T21:23:24Z (a year ago)
From
Anna Ridnaia at Ioffe Institute <ridnaia@mail.ioffe.ru>
Via
Web form
A.S. Kozyrev, D.V. Golovin, M.L. Litvak, I.G. Mitrofanov, and A.B. Sanin
on behalf of the HEND/Mars Odyssey team,
A. Ridnaia, D. Frederiks, A. Lysenko, D. Svinkin,
and T. Cline on behalf of the Konus-Wind team,
A. Goldstein, M. S. Briggs, C. Wilson-Hodge,
and E. Burns on behalf of the Fermi GBM team,
E. Bozzo and C. Ferrigno, on behalf of the INTEGRAL SPI-ACS GRB 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 240810A
(Fermi-GBM detection: The Fermi GBM team, GCN 37133)
was detected by Fermi (GBM), Konus-Wind, INTEGRAL (SPI-ACS),
and Mars-Odyssey (HEND) at about 76039 s UT (21:07:19).
We have triangulated it to a preliminary, 3 sigma error box
whose coordinates are:
---------------------------------------------
RA(2000), deg Dec(2000), deg
---------------------------------------------
Center:
146.339 (09h 45m 21s) -38.135 (-38d 08' 07")
Corners:
146.325 (09h 45m 18s) -38.221 (-38d 13' 16")
146.211 (09h 44m 51s) -38.270 (-38d 16' 13")
146.353 (09h 45m 25s) -38.050 (-38d 02' 58")
146.467 (09h 45m 52s) -38.000 (-37d 60' 00")
---------------------------------------------
The error box area is 51 sq. arcmin, and its maximum
dimension is 20 arcmin (the minimum one is 3 arcmin).
The Sun distance was 53 deg.
The IPN localization is consistent with, but reduces the area of,
the Fermi-GBM localization.
This localization may be improved.
A triangulation map and HEALPix FITS file are posted at
http://www.ioffe.ru/LEA/GRBs/GRB240810_T76037/IPN/
The HEALPix triangulation map is the multi-order HEALPix in units of
probability density.
The Konus-Wind time history and spectrum will be given
in a forthcoming GCN Circular.
GCN Circular 37145
Subject
Fermi GRB 240810A: Global MASTER-Net observations report
Date
2024-08-12T06:30:30Z (a year 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-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 240810A ( Fermi GBM team, GCN 37133) errorbox 1 days 25680 sec after notice time and 1 days 25712 sec after trigger time at 2024-08-12 04:15:52 UT, with upper limit up to 17.2 mag. Observations started at twilight. The observations began at zenith distance = 72 deg. The sun altitude is -13.6 deg.
The galactic latitude b = 6 deg., longitude l = 266 deg.
Real time updated cover map and OT discovered available here:
https://master.sai.msu.ru/site/master2/observ.php?id=2557980
We obtain a following upper limits.
Tmid-T0 | Date Time | Site | Coord (J2000) |Filt.| Expt. | Limit| Comment
_________|_____________________|_____________________|____________________________________|_____|_______|_______|________
112143 | 2024-08-12 04:15:52 | MASTER-SAAO | (09h 11m 37.13s , -40d 27m 07.6s) | C | 60 | 17.2 |
112222 | 2024-08-12 04:17:12 | MASTER-SAAO | (09h 22m 09.16s , -40d 27m 47.6s) | C | 60 | 16.9 |
112301 | 2024-08-12 04:18:31 | MASTER-SAAO | (09h 07m 31.92s , -42d 21m 54.8s) | C | 60 | 17.2 |
112381 | 2024-08-12 04:19:50 | MASTER-SAAO | (09h 18m 21.27s , -42d 20m 29.2s) | C | 60 | 16.9 |
112460 | 2024-08-12 04:21:10 | MASTER-SAAO | (09h 16m 00.63s , -38d 34m 42.0s) | C | 60 | 16.7 |
112539 | 2024-08-12 04:22:29 | MASTER-SAAO | (09h 26m 21.55s , -38d 34m 07.1s) | C | 60 | 16.5 |
112619 | 2024-08-12 04:23:48 | MASTER-SAAO | (09h 28m 10.31s , -42d 22m 01.6s) | C | 60 | 16.8 |
112698 | 2024-08-12 04:25:08 | MASTER-SAAO | (09h 39m 04.60s , -42d 20m 06.3s) | C | 60 | 16.5 |
Filter C is a clear (unfiltred) band.
The observation and reduction will continue.
The message may be cited.
GCN Circular 37133
Subject
GRB 240810A: Fermi GBM Final Real-time Localization
Date
2024-08-10T21:17:52Z (a year 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 SHORT GRB
At 21:07:19 UT on 10 Aug 2024, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 240810A (trigger 745016844.882908 / 240810880).
The on-ground calculated location, using the Fermi GBM trigger data, is RA = 140.1, Dec = -41.4 (J2000 degrees, equivalent to J2000 09h 20m, -41d 23'), with a statistical uncertainty of 3.1 degrees.
The angle from the Fermi LAT boresight is 31.0 degrees.
The skymap can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2024/bn240810880/quicklook/glg_skymap_all_bn240810880.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/bn240810880/quicklook/glg_healpix_all_bn240810880.fit
The GBM light curve can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2024/bn240810880/quicklook/glg_lc_medres34_bn240810880.gif