GRB150811B

This page lists all entries on GRB150811B in GRBweb

Summary Fermi GBM IPN GCN 18130 GCN 18133 GCN 18137

Summary table
Variable Value Source
GRB_name_Fermi GRB150811849
T0 20:22:09.515 UTC GCN_circulars,Konus-Wind Det
ra 186.3458° IPN
decl -14.1167° IPN
pos_error 5.70e+00° IPN
T90 0.64 s Fermi_GBM
T90_error 0.143 s Fermi_GBM
T90_start 20:22:13.685 UTC Fermi_GBM
fluence 3.43e-06 erg/cm² Fermi_GBM
fluence_error 4.24e-08 erg/cm² Fermi_GBM
T100 4.81 s
GBM_located False
mjd 57245.84872123843 GCN_circulars,Konus-Wind Det
Fermi GBM table
GRB_name_Fermi GRB150811849
trigger_name bn150811849
ra 186.3479°
decl -14.1050°
pos_error 5.60e+00°
datum 2015-08-11
t_trigger 20:22:13.749 UTC
T90 0.64 s
T90_error 0.143 s
T90_start 20:22:13.685 UTC
fluence 3.43e-06 erg/cm²
fluence_error 4.24e-08 erg/cm²
flux_1024 8.58e+00 erg/cm²/s
flux_1024_error 3.48e-01 erg/cm²/s
flux_1024_time -1.28e-01 erg/cm²/s
flux_64 2.74e+01 erg/cm²/s
flux_64_error 1.78e+00 erg/cm²/s
IPN table
GRB_name GRB150811B
ra 186.3458°
decl -14.1167°
pos_error 5.70e+00°
GCN 18130 table
GRB_name GRB150811B
GCN_number 18130
Detection_method Fermi GBM Det
t_trigger 20:22:13.750 UTC
ra 188.0000°
decl -13.5000°
Circular_text TITLE: GCN CIRCULAR NUMBER: 18130 SUBJECT: GRB 150811B: Fermi GBM detection DATE: 15/08/12 02:59:05 GMT FROM: Peter Jenke at MSFC P. Jenke (UAH) reports on behalf of the Fermi GBM Team: "At 20:22:13.75 UT on August 11 2015, the Fermi Gamma-Ray Burst Monitor triggered and located GRB 150811B (trigger 461017337/150811849). The GBM on-ground location, using the Fermi GBM trigger data, is RA = 188.0, Dec = -13.5 (J2000 degrees, equivalent to 12h 32m 00s, -13d 30'), with an uncertainty of 8.7 degree (radius, 1-sigma containment, statistical only; there is additionally a systematic error which is currently estimated to be 2 to 3 degrees). The angle of the burst direction to the Fermi LAT boresight is 108 degrees. The GBM light curve consists of a single peak with a duration (T90) of about 0.6 s (50-300 keV). The time-averaged spectrum from T0-0.13 s to T0+0.64 s is adequately fit by a Band function with Epeak = 1300 +/- 100 keV, Alpha =-0.23 +/- 0.07 and Beta = -3.0 +/- 0.2. The event fluence (10-1000 keV) in this time interval is (1.6 +/- 0.1)E-07 erg/cm^2. The 64 ms peak photon flux measured starting from T0-0.13 s in the 10-1000 keV band is 8.6 +/- 0.3 ph/s/cm^2. The spectral analysis results presented above are preliminary; final results will be published in the GBM GRB Catalog."
GCN 18133 table
GRB_name GRB150811B
GCN_number 18133
Detection_method IPN Triangulation
t_trigger 20:22:14 UTC
ra 186.3480°
decl -14.1050°
Circular_text TITLE: GCN CIRCULAR NUMBER: 18133 SUBJECT: IPN Triangulation of GRB 150811B DATE: 15/08/12 18:38:22 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 GRB 150811B has been detected by Fermi (GBM: Jenke, GCN Circ. 18130), Konus-Wind, and INTEGRAL (SPI-ACS), so far, at about 73334 s UT (20:22:14). We have triangulated it to a preliminary, 3 sigma error box whose coordinates are: --------------------------------------------- RA(2000), deg Dec(2000), deg --------------------------------------------- Center: 186.348 (12h 25m 23s) -14.105 (-14d 06' 20") Corners: 184.572 (12h 18m 17s) -16.337 (-16d 20' 12") 188.337 (12h 33m 21s) -12.037 (-12d 02' 14") 187.888 (12h 31m 33s) -11.720 (-11d 43' 10") 184.110 (12h 16m 26s) -16.010 (-16d 00' 36") --------------------------------------------- The error box area is 3.1 sq. deg, and its maximum dimension is 5.7 deg (the minimum one is 32.5 arcmin). The Sun distance was 52 deg. This box may be improved. A triangulation map is posted at http://www.ioffe.ru/LEA/GRBs/GRB150811_T73329/IPN/ The Konus-Wind time history and spectrum will be given in a forthcoming GCN Circular.
GCN 18137 table
GRB_name GRB150811B
GCN_number 18137
Detection_method Konus-Wind Det
t_trigger 20:22:09.515 UTC
Circular_text TITLE: GCN CIRCULAR NUMBER: 18137 SUBJECT: Konus-Wind observation of GRB 150811B DATE: 15/08/13 13:43:58 GMT FROM: Anastasia Tsvetkova at Ioffe Institute S. Golenetskii, R.Aptekar, D. Frederiks, V. Pal'shin, P. Oleynik, M. Ulanov, D. Svinkin, A. Tsvetkova, A. Lysenko, and T. Cline on behalf of the Konus-Wind team, report: The short-duration, hard-spectrum, intense GRB 150811B (Fermi GBM detection: Jenke, GCN 18130; IPN triangulation: Golenetskii et al., GCN 18133) triggered Konus-Wind at T0=73329.515 s UT (20:22:09.515). The burst light curve shows a single pulse with a duration of ~0.7 s. The emission is seen up to ~10 MeV. As observed by Konus-Wind, the burst had a fluence of 9.08(-1.11,+1.22)x10^-6 erg/cm2, and a 16-ms peak energy flux, measured from T0+0.232 s, of 2.89(-0.92,+0.95)x10^-5 erg/cm2/s (both in the 20 keV - 10 MeV energy range). The time-integrated spectrum of the burst (measured from T0 to T0+0.256 s) is best fit in the 20 keV - 10 MeV range by a power law with exponential cutoff model: dN/dE ~ (E^alpha)*exp(-E*(2+alpha)/Ep) with alpha = -0.35(-0.24,+0.29), and Ep = 1197(-220,+299) keV (chi2 = 28/27 dof). Fitting by the GRB (Band) model yields the same alpha and Ep, and an upper limit on the high energy photon index: beta < -2.51 (chi2 = 28/26 dof). The Konus-Wind light curve of this GRB is available at http://www.ioffe.ru/LEA/GRBs/GRB150811_T73329/ All the quoted errors are at the 90% confidence level. All the quoted values are preliminary.