GRB150819B

This page lists all entries on GRB150819B in GRBweb

Summary Fermi GBM IPN GCN 18176 GCN 18178 GCN 18180

Summary table
Variable Value Source
GRB_name_Fermi GRB150819440
T0 10:33:19 UTC GCN_circulars,IPN Triangulation
ra 59.3875° IPN
decl 39.7000° IPN
pos_error 1.40e+00° IPN
T90 0.96 s Fermi_GBM
T90_error 0.091 s Fermi_GBM
T90_start 10:33:19.433 UTC Fermi_GBM
fluence 8.12e-06 erg/cm² Fermi_GBM
fluence_error 2.42e-08 erg/cm² Fermi_GBM
T100 1.393 s
GBM_located False
mjd 57253.43980324074 GCN_circulars,IPN Triangulation
Fermi GBM table
GRB_name_Fermi GRB150819440
trigger_name bn150819440
ra 59.3858°
decl 39.7011°
pos_error 3.64e+00°
datum 2015-08-19
t_trigger 10:33:19.497 UTC
T90 0.96 s
T90_error 0.091 s
T90_start 10:33:19.433 UTC
fluence 8.12e-06 erg/cm²
fluence_error 2.42e-08 erg/cm²
flux_1024 3.90e+01 erg/cm²/s
flux_1024_error 5.98e-01 erg/cm²/s
flux_1024_time -6.40e-02 erg/cm²/s
flux_64 1.48e+02 erg/cm²/s
flux_64_error 3.77e+00 erg/cm²/s
IPN table
GRB_name GRB150819B
ra 59.3875°
decl 39.7000°
pos_error 1.40e+00°
GCN 18176 table
GRB_name GRB150819B
GCN_number 18176
Detection_method IPN Triangulation
t_trigger 10:33:19 UTC
ra 59.3860°
decl 39.7010°
Circular_text TITLE: GCN CIRCULAR NUMBER: 18176 SUBJECT: IPN Triangulation of GRB 150819B (short / very intense) DATE: 15/08/19 21:52:08 GMT FROM: Dmitry Svinkin at Ioffe Institute S. Golenetskii, R. Aptekar, V. Pal'shin, D. Frederiks, D. Svinkin, and T. Cline on behalf of the Konus-Wind team, K. Hurley, on behalf of the IPN, V. Connaughton, M. S. Briggs, C. Meegan, V. Pelassa, and A. Goldstein, on behalf of the Fermi GBM team, and A. von Kienlin, X. Zhang, A. Rau, V. Savchenko, E. Bozzo, and C. Ferrigno, on behalf of the INTEGRAL SPI-ACS GRB team, report: The short-duration, very intense GRB 150819B has been detected by Fermi (GBM trigger 461673203 / 150819440), Konus-Wind, and INTEGRAL (SPI-ACS), so far, at about 37999 s UT (10:33:19). We have triangulated it to a preliminary, 3 sigma error box whose coordinates are: --------------------------------------------- RA(2000), deg Dec(2000), deg --------------------------------------------- Center: 59.386 (03h 57m 33s) +39.701 (+39d 42' 05") Corners: 59.157 (03h 56m 38s) +40.372 (+40d 22' 21") 59.671 (03h 58m 41s) +39.060 (+39d 03' 35") 59.608 (03h 58m 26s) +39.029 (+39d 01' 45") 59.093 (03h 56m 22s) +40.341 (+40d 20' 29") --------------------------------------------- The error box area is 272 sq. arcmin, and its maximum dimension is 1.4 deg (the minimum one is 3.4 arcmin). The Sun distance was 81 deg. This box may be improved. A triangulation map is posted at http://www.ioffe.ru/LEA/GRBs/GRB150819_T38000/IPN/ The time history and spectrum will be given in forthcoming GCN Circulars.
GCN 18178 table
GRB_name GRB150819B
GCN_number 18178
Detection_method Fermi GBM Det
t_trigger 10:33:19.500 UTC
ra 62.7200°
decl 40.6000°
Circular_text TITLE: GCN CIRCULAR NUMBER: 18178 SUBJECT: GRB 150819B: Fermi GBM detection DATE: 15/08/20 02:15:28 GMT FROM: Eric Burns at U of Alabama H.-F. Yu (MPE) and E. Burns (UAH) report on behalf of the Fermi GBM Team: "At 10:33:19.50 UT on 19 August 2015, the Fermi Gamma-Ray Burst Monitor triggered and located GRB 150819B (trigger 461673203 / 150819440). The on-ground calculated location, using the GBM trigger data, is RA = 62.72, Dec = 40.60 (J2000 degrees, equivalent to 04h 10m 53s, 40d 36'), with an uncertainty of 2.2 degrees (radius, 1-sigma containment, statistical only; there is additionally a systematic error which we have characterized as a core-plus-tail model, with 90% of GRBs having a 3.7 deg error and a small tail suffering a larger than 10 deg systematic error. [Connaughton et al. 2015, ApJS, 216, 32] ). The trigger resulted in an Autonomous Repoint Request (ARR) by the GBM Flight Software owing to the high peak flux of the GRB. This ARR was accepted and the spacecraft slewed to the GBM in-flight location. The initial angle from the Fermi LAT boresight to the best location is 104 degrees . The GBM light curve consists of two pulses with a duration (T90) of about 0.96 s (50-300 keV). The time-averaged spectrum from T0-0.064 s to T0+0.896 s is best fit by a power law function with an exponential high-energy cutoff. The power law index is -1.04 +/- 0.02 and the cutoff energy, parameterized as Epeak, is 532 +/- 27 keV The event fluence (10-1000 keV) in this time interval is (7.6 +/- 0.1)E-06 erg/cm^2. The 64-ms peak photon flux measured starting from T0+0.000 s in the 10-1000 keV band is 148.4 +/- 3.8 ph/s/cm^2. The spectral analysis results presented above are preliminary; final results will be published in the GBM GRB Catalog."
GCN 18180 table
GRB_name GRB150819B
GCN_number 18180
Detection_method Konus-Wind Det
t_trigger 10:33:20.750 UTC
Circular_text TITLE: GCN CIRCULAR NUMBER: 18180 SUBJECT: Konus-Wind observation of GRB 150819B DATE: 15/08/20 12:46:07 GMT FROM: Dmitry Svinkin at Ioffe Institute S. Golenetskii, R. Aptekar, D. Frederiks, V. Pal'shin, P. Oleynik, M. Ulanov, D. Svinkin, A. Tsvetkova, A. Lysenko, A. Kozlova, and T. Cline on behalf of the Konus-Wind team, report: The short-duration, very intense GRB 150819B (IPN triangulation: Golenetskii et al., GCN 18176; Fermi GBM detection: Yu and Burns, GCN 18178) triggered Konus-Wind at T0=38000.750 s UT (10:33:20.750). The burst light curve shows at least three separate peaks. A total duration of the burst is ~1.2 s. The emission is seen up to ~3 MeV. As observed by Konus-Wind, the burst had a fluence of 6.61(-0.88,+1.10)x10^-6 erg/cm2, and a 16-ms peak flux, measured from T0+0.008 s, of 1.20(-0.17,+0.19)x10^-4 erg/cm2/s (both in the 20 keV - 10 MeV energy range). The time-averaged spectrum of the burst (measured from T0 to T0+8.448 s) is best fit in the 20 keV - 5 MeV range by a power law with exponential cutoff model: dN/dE ~ (E^alpha)*exp(-E*(2+alpha)/Ep) with alpha = -1.03(-0.21,+0.24) and Ep = 348(-70,+116) keV (chi2 = 74/89 dof). Fitting by the GRB (Band) model yields the same alpha and Ep, and an upper limit on the high energy photon index: beta < -2.3 (chi2 = 74/88 dof). The spectrum near the maximum count rate (measured from T0 to T0+0.064 s) is best fit in the 20 keV - 5 MeV range by a power law with exponential cutoff model with alpha = -0.41(-0.15,+0.17) and Ep = 618(-86,+95) keV (chi2 = 57/43 dof). Fitting by the GRB (Band) model yields the same alpha and Ep, and an upper limit on the high energy photon index: beta < -2.8 (chi2 = 57/42 dof). The Konus-Wind light curve of this GRB is available at http://www.ioffe.ru/LEA/GRBs/GRB150819_T38000/ All the quoted errors are at the 90% confidence level. All the quoted values are preliminary.