GRB250612C

This page lists all entries on GRB250612C in GRBweb

Summary Fermi GBM GCN 40704 GCN 40706 GCN 40708 GCN 40713 GCN 40746 GCN 40757

Summary table
Variable Value Source
GRB_name_Fermi GRB250612620
T0 14:53:11.512 UTC GCN_circulars,Konus-Wind Det
ra 115.4930° GCN_circulars,IPN Triangulation
decl 18.5740° GCN_circulars,IPN Triangulation
T90 1.616 s Fermi_GBM
T90_error 0.058 s Fermi_GBM
T90_start 14:53:16.662 UTC Fermi_GBM
fluence 2.22e-05 erg/cm² Fermi_GBM
fluence_error 1.37e-08 erg/cm² Fermi_GBM
T100 6.766 s
GBM_located False
mjd 60838.62027212963 GCN_circulars,Konus-Wind Det
Fermi GBM table
GRB_name_Fermi GRB250612620
trigger_name bn250612620
ra 113.2400°
decl 16.1700°
pos_error 2.71e+00°
datum 2025-06-12
t_trigger 14:53:16.582 UTC
T90 1.616 s
T90_error 0.058 s
T90_start 14:53:16.662 UTC
fluence 2.22e-05 erg/cm²
fluence_error 1.37e-08 erg/cm²
flux_1024 6.68e+01 erg/cm²/s
flux_1024_error 6.93e-01 erg/cm²/s
flux_1024_time 0.00e+00 erg/cm²/s
flux_64 1.54e+02 erg/cm²/s
flux_64_error 3.41e+00 erg/cm²/s
GCN 40704 table
GRB_name GRB250612C
GCN_number 40704
Detection_method Fermi GBM final loc
t_trigger 14:53:16 UTC
ra 113.2000°
decl 16.2000°
Circular_text TITLE: GCN CIRCULAR NUMBER: 40704 SUBJECT: GRB 250612C: Fermi GBM Final Real-time Localization DATE: 25/06/12 15:02:11 GMT FROM: Fermi GBM Team at MSFC/Fermi-GBM The Fermi GBM team reports the detection of a likely LONG GRB At 14:53:16 UT on 12 Jun 2025, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 250612C (trigger 771432801.582428 / 250612620). The on-ground calculated location, using the Fermi GBM trigger data, is RA = 113.2, Dec = 16.2 (J2000 degrees, equivalent to J2000 07h 32m, 16d 11'), with a statistical uncertainty of 1.4 degrees. The angle from the Fermi LAT boresight is 96.0 degrees. The skymap can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2025/bn250612620/quicklook/glg_skymap_all_bn250612620.png The HEALPix FITS file, including the estimated localization systematic, can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2025/bn250612620/quicklook/glg_healpix_all_bn250612620.fit The GBM light curve can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2025/bn250612620/quicklook/glg_lc_medres34_bn250612620.gif
GCN 40706 table
GRB_name GRB250612C
GCN_number 40706
Detection_method Other
Circular_text TITLE: GCN CIRCULAR NUMBER: 40706 SUBJECT: GRB 250612C: BALROG localization (Fermi Trigger 771432801 / GRB 250612620) DATE: 25/06/12 15:19:24 GMT FROM: Jochen Greiner at MPE T. Preis (University of Innsbruck) & J. Greiner (MPE Garching) report: The public trigdat data of the Fermi Gamma-ray Burst Monitor (GBM) trigger 771432801 at 14:53:16 on 12 June 2025 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) = 118.9 deg Decl.(2000.0) = 18.8 deg The 1 sigma statistical error radius is 1.1 deg. We estimate an additional systematic error of 1 deg. Further details are available at: https://grb.mpe.mpg.de/grb/GRB250612620/ The Healpix map can be downloaded from: https://grb.mpe.mpg.de/grb/GRB250612620/healpix The location parameters are available as JSON at: https://grb.mpe.mpg.de/grb/GRB250612620/json
GCN 40708 table
GRB_name GRB250612C
GCN_number 40708
Detection_method Fermi GBM Other
Circular_text TITLE: GCN CIRCULAR NUMBER: 40708 SUBJECT: GRB 250612C: SVOM/GRM observation an intermedium duration burst DATE: 25/06/12 16:01:33 GMT FROM: Chenwei Wang at IHEP SVOM/GRM team: Chen-Wei Wang, Shi-Jie Zheng, Yue Huang, Shao-Lin Xiong, Shuang-Nan Zhang (IHEP) SVOM/ECLAIRs team: Ulysse Jacob (LUPM), Jean-Luc Atteia (IRAP) Report on behalf of the SVOM team: SVOM/GRM was triggered in-flight by a bright burst GRB 250612C (SVOM trigger reference: sb25061214) at 2025-06-12T14:53:16.700 UTC (T0), which is also detected by Fermi/GBM (Fermi GBM Team, GCN#40704). The real-time alert data and light curves of SVOM/GRM were downlinked to the ground through the VHF system with low latency. With the VHF data, the GRM light curve shows that this burst consists of a single spike with a T90 of 2.4 +/-0.8 s in the 15-5000 keV band. This burst is clearly detected in GRM VHF data beyond 550 keV, indicating a hard spectrum. The SVOM/GRM light curve can be found here: https://www.bursthub.cn//admin/static/svgrb250612C.png At the time of the burst, ECLAIRs was not taking data. Refined analysis will be reported later. 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: Chen-Wei Wang (IHEP)(cwwang@ihep.ac.cn)
GCN 40713 table
GRB_name GRB250612C
GCN_number 40713
Detection_method Fermi GBM Det
t_trigger 14:53:16.580 UTC
Circular_text TITLE: GCN CIRCULAR NUMBER: 40713 SUBJECT: GRB 250612C: Fermi GBM Observation DATE: 25/06/12 21:54:11 GMT FROM: eliza.neights@gmail.com E. Neights (GWU, NASA GSFC) and C. Meegan (UAH) report on behalf of the Fermi Gamma-ray Burst Monitor Team: "At 14:53:16.58 UT on 12 June 2025, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 250612C (trigger 771432801/250612620). which was also detected by SVOM/GRM (Wang et al. 2025, GCN 40708). The Fermi-GBM position was reported in GCN 40708 (Fermi GBM Team 2025). The angle from the Fermi LAT boresight is 96 degrees. The GBM light curve consists of multiple emission episodes with a duration (T90) of about 1.62 s (50-300 keV). The time-averaged spectrum from T0-0.128 to T0+2.688 s is best fit by a power law function with an exponential high-energy cutoff. The power law index is -0.97 +/- 0.01 and the cutoff energy, parameterized as Epeak, is 2110 +/- 70 keV. A Band function fits the spectrum equally well with Epeak = 2110 +/- 70 keV, alpha = -0.97 +/- 0.01, and beta = -4 +/- 1. The event fluence (10-1000 keV) in this time interval is (2.80 +/- 0.02)E-05 erg/cm^2. The 64-ms peak photon flux measured starting from T0+0.77 s in the 10-1000 keV band is 154 +/- 3 ph/s/cm^2. The spectral analysis results presented above are preliminary; final results will be published in the GBM GRB Catalog: https://heasarc.gsfc.nasa.gov/W3Browse/fermi/fermigbrst.html For Fermi GBM data and info, please visit the official Fermi GBM Support Page: https://fermi.gsfc.nasa.gov/ssc/data/access/gbm/"
GCN 40746 table
GRB_name GRB250612C
GCN_number 40746
Detection_method Konus-Wind Det
t_trigger 14:53:11.512 UTC
Circular_text TITLE: GCN CIRCULAR NUMBER: 40746 SUBJECT: Konus-Wind detection of GRB 250612C (short/hard with extended emission) DATE: 25/06/16 11:33:32 GMT FROM: Dmitry Frederiks at Ioffe Institute D. Frederiks, A.Lysenko, A. Ridnaia, D. Svinkin, A. Tsvetkova, M. Ulanov, and T. Cline, on behalf of the Konus-Wind team, report: The bright GRB 250612C (Fermi GBM detection: Fermi GBM team, GCN 40704; Neights & Meegan, GCN 40713; SVOM/GRM observation: Wang et al., GCN 40708; GRID detection: Yang et al., GCN 40732) triggered Konus-Wind (KW) at T0=53591.512 s UT (14:53:11.512). The burst light curve shows a very bright, multi-peaked emission episode, which starts at ~T0-0.05 s and has a duration of ~1.3 s. This episode is followed by a much weaker extended emission tail visible to ~T0+25 s. The emission is seen up to ~15 MeV. The Konus-Wind light curve of this GRB is available at http://www.ioffe.ru/LEA/GRBs/GRB250612_T53591/ As observed by Konus-Wind, the burst had the total fluence of (6.92 ± 0.50)x10^-5 erg/cm^2 and a 16-ms peak energy flux, measured from T0+0.016, of (3.01 ± 0.38)x10^-4 erg/cm^2/s (both in the 20 keV - 10 MeV energy range). The time-integrated spectrum of the initial episode (measured from T0 to T0+1.280 s) is best fit in the 20 keV - 20 MeV range by a power law with exponential cutoff (CPL) model: dN/dE ~ (E^alpha)*exp(-E*(2+alpha)/Ep) with alpha = -0.90(-0.03,+0.02) and Ep = 2084 (-97,+103) keV (chi2 = 91.8/74 dof). Fitting this spectrum by a Band function yields similar, within errors, values of alpha and Ep, and an upper limit on the high energy photon index beta of -4.0 (chi2 = 91.7/73 dof). The spectrum near the peak count rate (measured from T0 to T0+0.064 s) is best fit in the 20 keV - 20 MeV range by a CPL model with alpha = -0.14(-0.13,+0.14) and Ep = 2073 (-214,+263) keV (chi2 = 38.7/35 dof). Fitting this spectrum by a Band function yields the same values of alpha and Ep, and an upper limit on the high energy photon index beta of -2.0 (chi2 = 38.4/34 dof). The spectrum of the extended emission, measured from T0+1.280 s to T0+25.856 s, is best fit in the 20 keV - 20 MeV range by a simple power law (PL) function with the photon PL index of -1.68 ± 0.12. All the quoted errors are estimated at the 68% confidence level. All the presented results are preliminary.
GCN 40757 table
GRB_name GRB250612C
GCN_number 40757
Detection_method IPN Triangulation
t_trigger 14:53:16 UTC
ra 115.4930°
decl 18.5740°
Circular_text TITLE: GCN CIRCULAR NUMBER: 40757 SUBJECT: IPN triangulation of GRB 250612C (short/hard) DATE: 25/06/17 16:02:15 GMT FROM: Dmitry Svinkin at Ioffe Institute D. Svinkin, D. Frederiks, A. Lysenko, A. Ridnaia, 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, and Y. Zhang, C. Wang, S. Xiong, J. Wei, and B. Cordier on behalf of the SVOM-GRM team, report: The bright, short-duration GRB 250612C (Fermi-GBM detection: The Fermi GBM team, GCN 40704; Neights and Meegan, GCN 40713; BALROG localization: Preis and Greiner, GCN 40706; SVOM-GRM detection: Wang et al., GCN 40708; GRID detection: Yang et al., GCN 40732; Konus-Wind detection: Frederiks et al., GCN 40746) was detected by Fermi (GBM trigger 771432801), SVOM (GRM), Konus-Wind, and GRID at about 53596 s UT (14:53:16). We have triangulated it to a preliminary, 3 sigma error box whose coordinates are: ------------------------------- RA(2000), deg Dec(2000), deg ------------------------------- Center: 115.493 18.574 Corners: 116.886 22.070 116.633 22.036 113.718 15.372 113.864 15.182 -------------------------------- The error box area is 5.5 sq. deg, and its maximum dimension is 7 deg (the minimum one is 14.7 arcmin). The Sun distance was 33 deg. This localization may be improved. The IPN localization is consistent with, but reduces the area of, the Fermi-GBM (GCN 40704) and BALROG (GCN 40706) localizations. A triangulation map and HEALPix FITS file are posted at http://www.ioffe.ru/LEA/GRBs/GRB250612_T53591/IPN/ The HEALPix triangulation map is the multi-order HEALPix in units of probability density.