GRB250117A

This page lists all entries on GRB250117A in GRBweb

Summary Fermi GBM GCN 38988 GCN 38994 GCN 39000 GCN 39001 GCN 39050

Summary table
Variable Value Source
GRB_name_Fermi GRB250117849
T0 20:21:53.657 UTC GCN_circulars,Konus-Wind Det
ra 249.3140° GCN_circulars,IPN Triangulation
decl -26.3870° GCN_circulars,IPN Triangulation
T90 0.832 s Fermi_GBM
T90_error 0.41 s Fermi_GBM
T90_start 20:21:57.670 UTC Fermi_GBM
fluence 1.48e-06 erg/cm² Fermi_GBM
fluence_error 1.21e-08 erg/cm² Fermi_GBM
T100 4.845 s
GBM_located False
mjd 60692.84853769676 GCN_circulars,Konus-Wind Det
Fermi GBM table
GRB_name_Fermi GRB250117849
trigger_name bn250117849
ra 252.5500°
decl -26.1800°
pos_error 5.27e+00°
datum 2025-01-17
t_trigger 20:21:57.894 UTC
T90 0.832 s
T90_error 0.41 s
T90_start 20:21:57.670 UTC
fluence 1.48e-06 erg/cm²
fluence_error 1.21e-08 erg/cm²
flux_1024 6.32e+00 erg/cm²/s
flux_1024_error 2.49e-01 erg/cm²/s
flux_1024_time 3.00e-03 erg/cm²/s
flux_64 2.71e+01 erg/cm²/s
flux_64_error 1.48e+00 erg/cm²/s
GCN 38988 table
GRB_name GRB250117A
GCN_number 38988
Detection_method Swift Other
Circular_text TITLE: GCN CIRCULAR NUMBER: 38988 SUBJECT: GRB 250117A: Swift/BAT-GUANO localization skymap of a short burst DATE: 25/01/19 20:21:11 GMT FROM: Jimmy DeLaunay at Penn State James DeLaunay (PSU), Samuele Ronchini (PSU), Aaron Tohuvavohu (Caltech), Gayathri Raman (PSU), Jamie A. Kennea (PSU), Tyler Parsotan (NASA GSFC) report: Swift/BAT did not localize GRB 250117A onboard (T0: 2025-11-17T20:21:57.89 UTC, Fermi trig 758838122, GECAM GCN 38982) The Fermi notice, distributed in near real-time, triggered the Swift Mission Operations Center operated Gamma-ray Urgent Archiver for Novel Opportunities (GUANO; Tohuvavohu et al. 2020, ApJ, 900, 1). Upon trigger by this notice, GUANO sent a command to the Swift Burst Alert Telescope (BAT) to save 200 seconds of BAT event-mode data from [-50,+150] seconds around the time of the burst. All the requested event mode data was delivered to the ground. The BAT likelihood search, NITRATES (DeLaunay + Tohuvavohu 2022, ApJ, 941, 169), performed on the temporal window [T0-20 s, T0+20 s], detects the burst with a sqrt(TS) of 17.2 in a 0.128 s analysis time bin, starting at T0 + 0.288 s. Using the NITRATES analysis, parameter estimation was performed to obtain the localization of this burst in the form of a HEALPIX Multi-Order Coverage (MOC) skymap. This localization accounts for both statistical and systematic errors. More details in the creation and calibration of these maps will soon be published (DeLaunay et al. 2025. in prep) The 90% credible area is 2,585 deg2 and the 50% credible area is 143 deg2. The integrated probability inside the coded field of view is <1%. The NITRATES skymap is consistent with the Fermi localization reported in the final position notice and the GECAM-B localization (GCN 38982). A plot of the probability skymap can be viewed here: [skymap_plot](https://guano.swift.psu.edu/trigger_report?id=758838152/#:~:text=Probability%20Skymap) The probability skymap file can be downloaded from the link here [skymap_fits_file](https://guano.swift.psu.edu/files/758838152/0_n_PROBMAP) Instructions on how to read and manipulate this map can be found here: https://guano.swift.psu.edu/documentation More details about this burst can be found on the trigger report page here: https://guano.swift.psu.edu/trigger_report?id=758838152 GUANO is a fully autonomous, extremely low latency, spacecraft commanding pipeline designed for targeted recovery of BAT event mode data around the times of compelling astrophysical events to enable more sensitive GRB searches. A live reporting of Swift/BAT event data recovered by GUANO can be found at: https://www.swift.psu.edu/guano/
GCN 38994 table
GRB_name GRB250117A
GCN_number 38994
Detection_method Konus-Wind Det
Circular_text TITLE: GCN CIRCULAR NUMBER: 38994 SUBJECT: GRB 250117A: SVOM/GRM observation of a short burst DATE: 25/01/20 04:00:03 GMT FROM: Chenwei Wang at IHEP SVOM/GRM team: Chen-Wei Wang, Yue Huang, Shi-Jie Zheng, Shao-Lin Xiong, Shuang-Nan Zhang (IHEP) report on behalf of the SVOM team: During the commissioning phase, SVOM/GRM was triggered in-flight by a short burst GRB 250117A (SVOM trigger reference: sb25011705) at 2025-01-17T20:21:58.300 UTC (T0), which was also detected by GECAM (GCN #38982), Swift/BAT (GCN #38988), Fermi/GBM, Konus-Wind and INTEGRAL/SPI-ACS. With the event-by-event data downloaded through the X-band ground station, the GRM light curve shows that this burst consists of multi-pulses with a T90 of 0.91 +0.43/-0.28 s. The SVOM/GRM light curve can be found here: https://www.bursthub.cn//admin/static/svgrb250117A.png 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/GRM point of contact for this burst is: Chen-Wei Wang (IHEP) (cwwang@ihep.ac.cn)
GCN 39000 table
GRB_name GRB250117A
GCN_number 39000
Detection_method IPN Triangulation
t_trigger 20:21:58 UTC
ra 249.3140°
decl -26.3870°
Circular_text TITLE: GCN CIRCULAR NUMBER: 39000 SUBJECT: IPN triangulation of GRB 250117A (short) DATE: 25/01/20 15:24:12 GMT FROM: Anna Ridnaia at Ioffe Institute 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 S. Barthelmy, J. Cummings, H. Krimm, D. Palmer, and A. Tohuvavohu on behalf of the Swift-BAT team, report: The short-duration GRB 250117A (GECAM-B detection: Wang et al., GCN 38982; Swift/BAT-GUANO localization: DeLaunay et al., GCN 38988; SVOM/GRM detection: Wang et al., GCN 38994) was detected by Konus-Wind, Fermi (GBM), INTEGRAL (SPI-ACS), Swift (BAT), GECAM-B, and SVOM (GRM), at about 73318 s UT (20:21:58). The burst was outside the coded field of view of the BAT. We have triangulated it to a preliminary, 3 sigma error box whose coordinates are: --------------------------------------------- RA(2000), deg Dec(2000), deg --------------------------------------------- Center: 249.314 (16h 37m 15s) -26.387 (-26d 23' 13") Corners: 249.983 (16h 39m 56s) -33.454 (-33d 27' 16") 248.910 (16h 35m 38s) -28.572 (-28d 34' 20") 250.252 (16h 41m 01s) -19.117 (-19d 07' 02") 249.847 (16h 39m 23s) -24.228 (-24d 13' 41") --------------------------------------------- The error box area is 5.4 sq. deg, and its maximum dimension is 14.3 deg (the minimum one is 36 arcmin). The Sun distance was 46 deg. This localization may be improved. A triangulation map and HEALPix FITS file are posted at http://www.ioffe.ru/LEA/GRBs/GRB250117_T73313/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 39001 table
GRB_name GRB250117A
GCN_number 39001
Detection_method Konus-Wind Det
t_trigger 20:21:53.657 UTC
Circular_text TITLE: GCN CIRCULAR NUMBER: 39001 SUBJECT: Konus-Wind detection of GRB 250117A DATE: 25/01/20 16:32:53 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 short-duration GRB 250117A (GECAM-B detection: Wang et al., GCN 38982; Swift/BAT-GUANO localization: DeLaunay et al., GCN 38988; SVOM/GRM detection: Wang et al., GCN 38994; IPN triangulation: Ridnaia et al., GCN 39000) triggered Konus-Wind at T0=73313.657 s UT (20:21:53.657). The burst light curve shows a weak count rate increase (from ~T0-0.412 s to ~T0-0.288) followed by a bright, multi-peaked pulse, which starts at ~T0-0.126 s and has a duration of ~0.138 s. The Konus-Wind light curve of this GRB is available at http://www.ioffe.ru/LEA/GRBs/GRB250117_T73313/ As observed by Konus-Wind, the burst had the total fluence of 7.70(-0.02,+2.44)x10^-7 erg/cm^2 and a 16-ms peak flux, measured from T0-0.008 s, of 1.87(-0.25,+0.64)x10^-5 erg/cm^2/s (both in the 20 keV - 10 MeV energy range). Since a major part of the burst emission was detected before the trigger time, the spectral analysis was performed using the KW 3-channel light curve data. Modelling the KW 3-channel spectrum of the main pulse (measured from T0-0.126 s to T0+0.012 s) by a power law with exponential cutoff (CPL) model: dN/dE ~ (E^alpha)*exp(-E*(2+alpha)/Ep), yields alpha = 0.52 (-0.54, + 0.75) and Ep = 459(-62,+84) keV. All the quoted errors are estimated at the 68% confidence level. All the presented results are preliminary.
GCN 39050 table
GRB_name GRB250117A
GCN_number 39050
Detection_method Fermi GBM Det
t_trigger 20:21:57.890 UTC
ra 252.5500°
decl -26.1800°
Circular_text TITLE: GCN CIRCULAR NUMBER: 39050 SUBJECT: GRB 250117A: Fermi GBM Observation DATE: 25/01/28 00:30:20 GMT FROM: oindabimukherjee@gmail.com O. Mukherjee (USRA) and C. Meegan (UAH) report on behalf of the Fermi Gamma-ray Burst Monitor Team: "At 20:21:57.89 UT on 17 January 2025, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 250117A (trigger 758838122/250117849). which was also detected by Konus-Wind (Ridnaia et al. 2025, GCN 39001), Swift/BAT-GUANO (DeLaunay et al. 2025, GCN 38988), and SVOM/GRM (Wang et al. 2025, GCN 38994). The on-ground calculated location, using the Fermi GBM trigger data, is RA = 252.55, Dec = -26.18 (J2000 degrees, equivalent to J2000 20h 26m, +21d 13'), with a statistical uncertainty of 3.32 degrees. (radius, 1-sigma containment, statistical only; there is additionally a systematic error which we have characterized as a mixture of two Gaussians, one with a radius of 1.8 degrees (52% contribution) and one with a radius of 4.1 degrees (47% contribution) [A. Goldstein et al. 2020, ApJ, 895, 1]). The angle from the Fermi LAT boresight is 67 degrees. An overwhelming volume of data produced by a contemporaneous solar flare affected the spacecraft's ability to record data nominally, so TTE data was unavailable for this burst. Consequently, the temporal and spectral analysis used the CTIME and CSPEC data types only. The GBM light curve consists of one peak with a duration (T90) of about 0.8 s (50-300 keV). The time-averaged spectrum from T0+0.002 to T0+1.824 s is best fit by a power law function with an exponential high-energy cutoff. The power law index is -1.18 +/- 0.09 and the cutoff energy, parameterized as Epeak, is 904 +/- 386 keV. The event fluence (10-1000 keV) in this time interval is (1.35 +/- 0.08)E-06 erg/cm^2. The 64-ms peak photon flux measured starting from T0+0.35 s in the 10-1000 keV band is 27 +/- 1 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/"