GRB150922A

This page lists all entries on GRB150922A in GRBweb

Summary Fermi GBM IPN GCN 18357 GCN 18358 GCN 18360

Summary table
Variable Value Source
GRB_name_Fermi GRB150922234
T0 5:37:29 UTC GCN_circulars,IPN Triangulation
ra 294.3792° IPN
decl -5.4833° IPN
pos_error 1.25e+00° IPN
T90 0.144 s Fermi_GBM
T90_error 0.036 s Fermi_GBM
T90_start 5:37:29.060 UTC Fermi_GBM
fluence 9.57e-07 erg/cm² Fermi_GBM
fluence_error 1.69e-08 erg/cm² Fermi_GBM
T100 0.204 s
GBM_located False
mjd 57287.23436342592 GCN_circulars,IPN Triangulation
Fermi GBM table
GRB_name_Fermi GRB150922234
trigger_name bn150922234
ra 294.3808°
decl -5.4861°
pos_error 5.31e+00°
datum 2015-09-22
t_trigger 5:37:29.076 UTC
T90 0.144 s
T90_error 0.036 s
T90_start 5:37:29.060 UTC
fluence 9.57e-07 erg/cm²
fluence_error 1.69e-08 erg/cm²
flux_1024 2.85e+00 erg/cm²/s
flux_1024_error 1.82e-01 erg/cm²/s
flux_1024_time -6.40e-02 erg/cm²/s
flux_64 2.33e+01 erg/cm²/s
flux_64_error 1.26e+00 erg/cm²/s
IPN table
GRB_name GRB150922A
ra 294.3792°
decl -5.4833°
pos_error 1.25e+00°
GCN 18357 table
GRB_name GRB150922A
GCN_number 18357
Detection_method IPN Triangulation
t_trigger 5:37:29 UTC
ra 294.3810°
decl -5.4860°
Circular_text TITLE: GCN CIRCULAR NUMBER: 18357 SUBJECT: IPN Triangulation of GRB 150922A (short/hard) DATE: 15/09/22 21:10:23 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, I. G. Mitrofanov, D. Golovin, M. L. Litvak, and A. B. Sanin, on behalf of the HEND-Odyssey GRB team, V. Connaughton, M. S. Briggs, C. Meegan, V. Pelassa, and A. Goldstein, on behalf of the Fermi GBM team, A. von Kienlin, X. Zhang, A. Rau, V. Savchenko, E. Bozzo, and C. Ferrigno, on behalf of the INTEGRAL SPI-ACS GRB team, and W. Boynton, C. Fellows, K. Harshman, H. Enos, and R. Starr, on behalf of the GRS-Odyssey GRB team, report: The short-duration, hard-spectrum GRB 150922A has been detected by Konus-Wind, Fermi (GBM trigger 464593053/150922234), Mars-Odyssey (HEND), and INTEGRAL (SPI-ACS), so far, at about 20249 s UT (05:37:29). We have triangulated it to a preliminary, 3 sigma error box whose coordinates are: --------------------------------------------- RA(2000), deg Dec(2000), deg --------------------------------------------- Center: 294.381 (19h 37m 31s) -5.486 ( -5d 29' 10") Corners: 294.315 (19h 37m 16s) -6.116 ( -6d 06' 57") 294.303 (19h 37m 13s) -5.399 ( -5d 23' 56") 294.448 (19h 37m 48s) -4.881 ( -4d 52' 51") 294.458 (19h 37m 50s) -5.573 ( -5d 34' 25") --------------------------------------------- The error box area is 385 sq. arcmin, and its maximum dimension is 75 arcmin (the minimum one is 9.1 arcmin). The Sun distance was 115 deg. This box may be improved. A triangulation map is posted at http://www.ioffe.ru/LEA/GRBs/GRB150922_T20250/IPN/ The time history and spectrum will be given in forthcoming GCN Circulars.
GCN 18358 table
GRB_name GRB150922A
GCN_number 18358
Detection_method Fermi GBM Det
t_trigger 5:37:29.080 UTC
Circular_text TITLE: GCN CIRCULAR NUMBER: 18358 SUBJECT: GRB 150922A: Fermi GBM observation DATE: 15/09/23 09:04:05 GMT FROM: Oliver Roberts at UCD/Fermi O.J. Roberts (UCD), A. von Kienlin (MPE) and C. Meegan (UAH),report on behalf of the Fermi GBM Team: "At 05:37:29.08 UT on 22 September 2015, the Fermi Gamma-Ray Burst Monitor triggered and located GRB 150922A (trigger 464593053 / 150922234), which was also detected by IPN (Svinkin et al. 2015, GCN 18357). The GBM on-ground location is consistent with the IPN position. The angle from the Fermi LAT boresight is about 38 degrees. The GBM light curve shows a short burst with a duration (T90) of 0.144 s (50-300 keV). The time-averaged spectrum from T0-0.016 to T0+0.128 s is best fit by a power law function with an exponential high-energy cutoff. The power law index is -0.55 +/- 0.11 and the cutoff energy, parameterized as Epeak, is 625 +/- 97 keV. The event fluence (10-1000 keV) in this time interval is (8.0 +/- 0.4) E-07 erg/cm^2. The 64 ms peak photon flux measured starting from T0-0.016 s in the 10-1000 keV band is 23.0 +/- 1.3 ph/s/cm^2. The spectral analysis results presented above are preliminary; final results will be published in the GBM GRB Catalog."
GCN 18360 table
GRB_name GRB150922A
GCN_number 18360
Detection_method Konus-Wind Det
t_trigger 5:37:30.916 UTC
Circular_text TITLE: GCN CIRCULAR NUMBER: 18360 SUBJECT: Konus-Wind observation of GRB 150922A DATE: 15/09/23 13:09:30 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, hard-spectrum GRB 150922A (IPN triangulation: Golenetskii et al., GCN 18357; Fermi GBM detection: Roberts et al., GCN 18358) triggered Konus-Wind at T0=20250.916 s UT (05:37:30.916). The burst light curve shows a multipeak structure with a total duration of ~0.16 s. The emission is seen up to ~2 MeV. The Konus-Wind light curve of this GRB is available at http://www.ioffe.ru/LEA/GRBs/GRB150922_T20250/ As observed by Konus-Wind, the burst had a fluence of 7.94(-1.93,+2.25)x10^-7 erg/cm2, and a 16-ms peak flux, measured from T0-0.008 s, of 1.34(-0.52,+0.59)x10^-5 erg/cm2/s (both in the 20 keV - 10 MeV energy range). The time-averaged spectrum of the burst (measured from T0 to T0+0.064 s) is best fit in the 20 keV - 2 MeV range by a power law with exponential cutoff model: dN/dE ~ (E^alpha)*exp(-E*(2+alpha)/Ep) with alpha = -0.17(-0.66,+1.10) and Ep = 393(-132,+222) keV (chi2 = 11/13 dof). Fitting by a GRB (Band) model yields the same alpha and Ep, and an upper limit on the high energy photon index: beta < -2 (chi2 = 11/12 dof) All the quoted errors are at the 90% confidence level. All the quoted values are preliminary.