Gamma-ray Burst 240810A

(All information courtesy of the instrument teams.)

Previous IAU Circulars

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Results of Observations

GCN NOTICE

TITLE:           GCN/FERMI NOTICE
NOTICE_DATE:     Sat 10 Aug 24 21:07:49 UT
NOTICE_TYPE:     Fermi-GBM Flight Position
RECORD_NUM:      49
TRIGGER_NUM:     745016844
GRB_RA:          136.733d {+09h 06m 56s} (J2000),
                 136.904d {+09h 07m 37s} (current),
                 136.386d {+09h 05m 33s} (1950)
GRB_DEC:         -57.000d {-57d 00' 00"} (J2000),
                 -57.100d {-57d 05' 59"} (current),
                 -56.798d {-56d 47' 51"} (1950)
GRB_ERROR:       4.65 [deg radius, statistical plus systematic]
GRB_INTEN:       1549 [cnts/sec]
DATA_SIGNIF:     18.90 [sigma]
INTEG_TIME:      0.064 [sec]
GRB_DATE:        20532 TJD;   223 DOY;   24/08/10
GRB_TIME:        76039.88 SOD {21:07:19.88} UT
GRB_PHI:         300.00 [deg]
GRB_THETA:        20.00 [deg]
DATA_TIME_SCALE: 0.0640 [sec]
HARD_RATIO:      0.41
LOC_ALGORITHM:   3 (version number of)
MOST_LIKELY:      95%  GRB
2nd_MOST_LIKELY:   4%  Generic Transient
DETECTORS:       1,1,0, 1,0,1, 1,1,0, 0,0,0, 0,0,
SUN_POSTN:       141.14d {+09h 24m 35s}  +15.21d {+15d 12' 49"}
SUN_DIST:         72.40 [deg]   Sun_angle= 0.3 [hr] (West of Sun)
MOON_POSTN:      206.51d {+13h 46m 03s}  -13.06d {-13d 03' 33"}
MOON_DIST:        68.03 [deg]
MOON_ILLUM:      34 [%]
GAL_COORDS:      275.86, -6.45 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      178.72,-66.63 [deg] ecliptic lon,lat of the burst (or transient)
LC_URL:          http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2024/bn240810880/quicklook/glg_lc_medres34_bn240810880.gif
COMMENTS:        Fermi-GBM Flight-calculated Coordinates.  
COMMENTS:        This trigger occurred at longitude,latitude = 183.02,-25.50 [deg].  
COMMENTS:        The LC_URL file will not be created until ~15 min after the trigger.

GCN NOTICE

TITLE:           GCN/FERMI NOTICE
NOTICE_DATE:     Sat 10 Aug 24 21:08:07 UT
NOTICE_TYPE:     Fermi-GBM Ground Position
RECORD_NUM:      59
TRIGGER_NUM:     745016844
GRB_RA:          141.100d {+09h 24m 24s} (J2000),
                 141.338d {+09h 25m 21s} (current),
                 140.618d {+09h 22m 28s} (1950)
GRB_DEC:         -42.090d {-42d 05' 23"} (J2000),
                 -42.197d {-42d 11' 47"} (current),
                 -41.874d {-41d 52' 26"} (1950)
GRB_ERROR:       4.52 [deg radius, statistical only]
DATA_SIGNIF:     21.80 [sigma]
DATA_INTERVAL:   0.064 [sec]
GRB_DATE:        20532 TJD;   223 DOY;   24/08/10
GRB_TIME:        76039.88 SOD {21:07:19.88} UT
GRB_PHI:         325.00 [deg]
GRB_THETA:        31.00 [deg]
E_RANGE:         44.032 - 279.965 [keV]
LOC_ALGORITHM:   4173 (Gnd S/W Version number)
SUN_POSTN:       141.14d {+09h 24m 35s}  +15.21d {+15d 12' 49"}
SUN_DIST:         57.41 [deg]   Sun_angle= -0.0 [hr] (East of Sun)
MOON_POSTN:      206.51d {+13h 46m 04s}  -13.06d {-13d 03' 36"}
MOON_DIST:        62.95 [deg]
MOON_ILLUM:      34 [%]
GAL_COORDS:      267.06,  5.92 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      164.43,-53.16 [deg] ecliptic lon,lat of the burst (or transient)
LC_URL:          http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2024/bn240810880/quicklook/glg_lc_medres34_bn240810880.gif
POS_MAP_URL:     http://gcn.gsfc.nasa.gov/notices_f/gbm_gnd_loc_map_745016844.fits
COMMENTS:        Fermi-GBM Ground-calculated Coordinates.  
COMMENTS:        In the LAT Field-of-view.  
COMMENTS:        Bright hard burst in the GBM.  
COMMENTS:        This Notice was ground-generated -- not flight-generated.  
COMMENTS:        The LC_URL file will not be created/available until ~15 min after the trigger.  
COMMENTS:        The POS_MAP_URL file will not be created/available until ~1.5 min after the notice.

GCN NOTICE

TITLE:           GCN/FERMI NOTICE
NOTICE_DATE:     Sat 10 Aug 24 21:16:37 UT
NOTICE_TYPE:     Fermi-GBM Final Position
RECORD_NUM:      0
TRIGGER_NUM:     745016844
GRB_RA:          140.090d {+09h 20m 22s} (J2000),
                 140.328d {+09h 21m 19s} (current),
                 139.607d {+09h 18m 26s} (1950)
GRB_DEC:         -41.400d {-41d 23' 59"} (J2000),
                 -41.505d {-41d 30' 18"} (current),
                 -41.187d {-41d 11' 13"} (1950)
GRB_ERROR:       3.12 [deg radius, statistical only]
GRB_DATE:        20532 TJD;   223 DOY;   24/08/10
GRB_TIME:        76039.88 SOD {21:07:19.88} UT
GRB_PHI:         327.00 [deg]
GRB_THETA:        31.00 [deg]
E_RANGE:         44.032 - 279.965 [keV]
LOC_ALGORITHM:   41731 (Gnd S/W Version number)
SUN_POSTN:       141.15d {+09h 24m 36s}  +15.21d {+15d 12' 43"}
SUN_DIST:         56.72 [deg]   Sun_angle= 0.1 [hr] (West of Sun)
MOON_POSTN:      206.58d {+13h 46m 19s}  -13.09d {-13d 05' 25"}
MOON_DIST:        63.65 [deg]
MOON_ILLUM:      34 [%]
GAL_COORDS:      266.03,  5.88 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      162.77,-52.96 [deg] ecliptic lon,lat of the burst (or transient)
LC_URL:          http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2024/bn240810880/quicklook/glg_lc_medres34_bn240810880.gif
LOC_URL:         http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2024/bn240810880/quicklook/glg_locplot_all_bn240810880.png
COMMENTS:        Fermi-GBM Final Position.  
COMMENTS:        This Notice was ground-generated -- not flight-generated.  
COMMENTS:        The LC_URL file should be available by the time this FINAL notice is produced.  
COMMENTS:        This notice was generated completely by automated pipeline processing.  
COMMENTS:        In the LAT Field-of-view.  
COMMENTS:        This is likely a Short GRB.

GCN Circular #37133
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
GCN Circular #37145
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 #37156
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 #37166
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 Zha= ng, 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 (L= UPM/INAF-OAB), Laurent Bouchet (IRAP), David Corre (CEA), Tais Maiolino (LU= PM), Fr=C3=A9d=C3=A9ric Piron (LUPM) , St=C3=A9phane Schanne (CEA), Jingwei= Wang (IAP)
SVOM JSWG: Jian-Yan Wei (NAOC), Bertrand Cordier (CEA), Shuang-Nan Zhang (I= HEP), St=C3=A9phane Basa (LAM), JeanLuc Att=C3=A9ia (IRAP), Arnaud Claret (= CEA), Zi-Gao Dai (USTC), Fr=C3=A9d=C3=A9ric Daigne (IAP), Jin-Song Deng (NA= OC), Andrea Goldwurm (APC), Diego G=C3=B6tz (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 th= e ground through the VHF system with low latency. The light curves show tha= t 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 posi= tion (from Fermi/GBM) was outside the ECLAIRs FoV.
The Space Variable Objects Monitor (SVOM) is a China-France joint mission l= ed by the Chinese National Space Administration (CNSA, China), National Cen= ter for Space Studies (CNES, France) and the Chinese Academy of Sciences (C= AS, China), which is dedicated to observing gamma-ray bursts and other tran= sient phenomena in the energetic universe. GRM is developed by the Institut= e of High Energy Physics (IHEP) of CAS.
The SVOM point of contact for this burst is: Jian-Chao Sun (IHEP)(sunjc@ihe= p.ac.cn)
GCN Circular #37172
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.

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