GRB240807A

This page lists all entries on GRB240807A in GRBweb

Summary Fermi GBM IPN GCN 37089 GCN 37097 GCN 37108 GCN 37120 GCN 37130

Summary table
Variable Value Source
GRB_name_Fermi GRB240807238
T0 5:42:44.561 UTC Fermi_GBM
ra 300.9708° IPN
decl -68.7833° IPN
pos_error 4.17e-02° IPN
T90 4.736 s Fermi_GBM
T90_error 0.429 s Fermi_GBM
T90_start 5:42:44.561 UTC Fermi_GBM
fluence 4.86e-07 erg/cm² Fermi_GBM
fluence_error 1.59e-08 erg/cm² Fermi_GBM
T100 4.736 s
GBM_located False
mjd 60529.238015752315 Fermi_GBM
Fermi GBM table
GRB_name_Fermi GRB240807238
trigger_name bn240807238
ra 346.2200°
decl -82.5800°
pos_error 1.05e+01°
datum 2024-08-07
t_trigger 5:42:45.201 UTC
T90 4.736 s
T90_error 0.429 s
T90_start 5:42:44.561 UTC
fluence 4.86e-07 erg/cm²
fluence_error 1.59e-08 erg/cm²
flux_1024 3.83e+00 erg/cm²/s
flux_1024_error 6.12e-01 erg/cm²/s
flux_1024_time -8.32e-01 erg/cm²/s
flux_64 9.44e+00 erg/cm²/s
flux_64_error 2.97e+00 erg/cm²/s
IPN table
GRB_name GRB240807A
ra 300.9708°
decl -68.7833°
pos_error 4.17e-02°
GCN 37089 table
GRB_name GRB240807A
GCN_number 37089
Detection_method Fermi GBM Other
ra 346.2000°
decl -82.6000°
Circular_text TITLE: GCN CIRCULAR NUMBER: 37089 SUBJECT: GRB 240807A: Fermi GBM Final Localization DATE: 24/08/07 13:47:38 GMT FROM: Christian Malacaria at INAF-OAR The Fermi GBM team reports the detection of a likely Short GRB. At 05:42:45 UT on 7 Aug 2024, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 240807A (trigger 744702170 / 240807238). The on-ground calculated location, using the Fermi GBM trigger data, is RA = 346.2, Dec = -82.6 (J2000 degrees, equivalent to J2000 23h 04m, -82d 34'), with a statistical uncertainty of 7.1 degrees. The angle from the Fermi LAT boresight is 148.0 degrees. The skymap can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2024/bn240807238/quicklook/glg_skymap_all_bn240807238.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/bn240807238/quicklook/glg_healpix_all_bn240807238.fit The GBM light curve can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2024/bn240807238/quicklook/glg_lc_medres34_bn240807238.gif
GCN 37097 table
GRB_name GRB240807A
GCN_number 37097
Detection_method Fermi GBM Other
Circular_text TITLE: GCN CIRCULAR NUMBER: 37097 SUBJECT: EP240807a/GRB 240807A: EP-FXT detection of the X-ray emission DATE: 24/08/08 03:01:27 GMT FROM: EP Team at NAOC/CAS J. W. Hu, S. Q. Jiang (NAOC, CAS), Y. C. Fu (BNU) , Z. X. Ling, W. D. Zhang, Y. Liu, C. C. Jin, C. Zhang, H. Q. Cheng, W. Chen, C. Z. Cui, D. W. Fan, H. B. Hu, M. H. Huang, D. Y. Li, H. Y. Liu, M. J. Liu, Z. Z. Lv, T. Y. Lian, X. Mao, H. W. Pan, X. Pan, H. Sun, W. X. Wang, Y. L. Wang, Q. Y. Wu, X. P. Xu, Y. F. Xu, H. N. Yang, W. Yuan, M. Zhang, W. J. Zhang, Z. Zhang, D. H. Zhao (NAOC, CAS), Y. Chen, S. M. Jia, W. W. Cui, D. W. Han, C. K. Li, L. M. Song, X. F. Zhao, J. Zhang, S. N. Zhang (IHEP, CAS), E. Kuulkers, A. Santovincenzo (ESA), P. O'Brien (Univ. of Leicester), K. Nandra, A. Rau (MPE), B. Cordier (CEA) on behalf of the Einstein Probe team Following the detection of the fast X-ray transient EP240807a (trigger ID 11908397839; Fu et al., GCN 37088), which was temporally coincident with GRB 240807A (Fermi GBM team, GCN 37089), we performed an observation of EP240807a with the Follow-up X-ray Telescope (FXT) on board the Einstein Probe (EP) mission. The observation began at 2024-08-07T13:23:29 UTC, about 7.7 hours after the EP-WXT detection. The exposure time is 4434 seconds. Within the error circle of the WXT source, an X-ray source was detected at R.A. = 300.9668 deg, DEC = -68.7861 deg, with an uncertainty of 10 arcsec (radius, 90% C.L. statistical and systematic). The average 0.5-10 keV spectrum can be fitted with an absorbed power law with a photon index of 1.65(-0.38, +0.39) (with a fixed Galactic column density value of 5 x 10^20 cm^-2). The derived average unabsorbed 0.5-10 keV flux is 2.8(-0.8, +1.4) x 10^(-13) erg/s/cm^2. There is no cataloged X-ray source within the error circle, suggesting this source being associated with EP240807a. Launched on January 9, 2024, EP is a space X-ray observatory to monitor the soft X-ray sky with X-ray follow-up capability (Yuan et al. 2022, Handbook of X-ray and Gamma-ray Astrophysics).
GCN 37108 table
GRB_name GRB240807A
GCN_number 37108
Detection_method Optical
Circular_text TITLE: GCN CIRCULAR NUMBER: 37108 SUBJECT: EP240807a: STEP/T80S optical limits DATE: 24/08/08 22:35:04 GMT FROM: André Santos at Centro Brasileiro de Pesquisas Físicas (CBPF) A. Santos (CBPF), L. Santana-Silva (CBPF), C. R. Bom (CBPF), C. D. Kilpatrick (Northwestern), P. Darc (CBPF), C. Mendes de Oliveira (IAG-USP) report on behalf of the STEP collaboration: We conducted optical follow up with the T80S 0.8-m robotic telescope (Santos et al., 2024, MNRAS, 529, 59) of the fast X-ray transient EP240807a discovered by the Einstein Probe (GCN [36691](https://gcn.nasa.gov/circulars/36691). EP240807a was temporally coincident with the Fermi-GBM alert from GRB240807A (GCN 37089) and subsequently localized by the Follow-up X-ray Telescope (FXT) on Einstein probe (GCN 37097). The T80S observations started on August 8 07:40 UT (~16 hours after the trigger). We obtained images totaling 360s (2x180s) in g-band and 720s (3x240s) in r-band with the T80S camera centered at the position of the FXT counterpart at R.A.=20:03:52.90 and Decl.=-68:46:37.20 (J2000). Subtracting DECAM template images from the T80S frames using photpipe (Rest et al., 2005), we do not detect any transient source in our difference images and derive 3-sigma limiting magnitudes of g > 21.9 and r > 22.2 mag for any optical transient.
GCN 37120 table
GRB_name GRB240807A
GCN_number 37120
Detection_method IPN Triangulation
t_trigger 5:42:45 UTC
ra 295.5590°
decl -22.8210°
Circular_text TITLE: GCN CIRCULAR NUMBER: 37120 SUBJECT: IPN triangulation of GRB 240807A / EP 240807a DATE: 24/08/09 22:41:04 GMT FROM: Anna Ridnaia at Ioffe Institute A. Ridnaia, D. Frederiks, D. Svinkin, A. Lysenko, 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 J. DeLaunay, A. Tohuvavohu, S. Barthelmy, J. Cummings, H. Krimm, and D. Palmer on behalf of the Swift-BAT team, report: The long-duration GRB 240807A (Fermi GBM detection: Fermi GBM team, GCN 37089; SVOM-GRM detection: Wang et al., GCN 37111) was detected by Fermi (GBM), Konus-Wind, in the waiting mode, INTEGRAL (SPI-ACS), Swift (BAT), and SVOM (GRM) at about 20565 s UT (05:42:45). The burst was outside the coded field of view of the BAT. We have triangulated it to a GBM-Konus annulus centered at RA(2000)=295.559 deg (19h 42m 14s) Dec(2000)=-22.821 deg (-22d 49' 15"), whose radius is 32.402 +/- 32.402 deg (3 sigma). This localization may be improved. The fast X-ray transient EP 240807a (Fu et al., GCN 37088; Hu et al., GCN 37097) is inside the annulus and is consistent with the Konus-Wind ecliptic latitude response, supporting the association of the GRB and EP 240807a. A triangulation map and HEALPix FITS file are posted at http://www.ioffe.ru/LEA/GRBs/GRB240807A/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 37130 table
GRB_name GRB240807A
GCN_number 37130
Detection_method Konus-Wind Det
t_trigger 5:42:48 UTC
Circular_text TITLE: GCN CIRCULAR NUMBER: 37130 SUBJECT: Konus-Wind detection of GRB 240807A (a counterpart of EP240807a) DATE: 24/08/10 11:10:53 GMT FROM: Anna Ridnaia at Ioffe Institute A. Ridnaia, D. Frederiks, A. Lysenko, D. Svinkin, A. Tsvetkova, M. Ulanov, and T. Cline, on behalf of the Konus-Wind team, report: The long-duration GRB 240807A (Fermi GBM detection: Fermi GBM team, GCN 37089; SVOM-GRM detection: Wang et al., GCN 37111; IPN triangulation: Ridnaia et al., GCN 37120) was detected by Konus-Wind (KW) in the waiting mode at T0~20568 s UT (05:42:48). A Bayesian block analysis of the KW waiting mode data in the 20-300 keV band reveals a >8 sigma count rate increase in the interval from ~T0+0.143 s to ~T0+3.087 s. Corrected for the propagation time, the burst started ~4 s before the start time of the fast X-ray transient EP240807a (T0(EP)=05:42:48 UT; Fu et al., GCN 37088). The positional (Ridnaia et al., GCN 37120) and temporal coincidence of GRB 240807A with the EP transient supports the conclusion that EP240807a is the GRB counterpart. The Konus-Wind light curve of this GRB is available at http://www.ioffe.ru/LEA/GRBs/GRB240807A/ The time-integrated spectrum of the burst, measured from T0+0.143 s to T0+3.087 s, cat be described by a power law with exponential cutoff (CPL) model dN/dE ~ (E^alpha)*exp(-E*(2+alpha)/Ep) with alpha = -0.60(-0.95,+3.74) and Ep = 134(-35,+285) keV. The total burst fluence is 4.24(-0.01,+4.68)x10^-7 erg/cm^2, and the 2.944 s peak energy flux, measured from T0+0.143 s, is 1.43(-0.27,+1.61)x10^-7 erg/cm^2. (both in the 20 keV - 10 MeV energy range). All the quoted errors are estimated at the 68% confidence level. All the presented results are preliminary.