GRB140825A

This page lists all entries on GRB140825A in GRBweb

Summary IPN GCN 16752 GCN 16755

Summary table
Variable Value Source
T0 6:55:25 UTC GCN_circulars,IPN Triangulation
ra 88.7125° IPN
decl -11.8333° IPN
pos_error 4.50e-01° IPN
GBM_located False
mjd 56894.2884837963 GCN_circulars,IPN Triangulation
IPN table
GRB_name GRB140825A
ra 88.7125°
decl -11.8333°
pos_error 4.50e-01°
GCN 16752 table
GRB_name GRB140825A
GCN_number 16752
Detection_method IPN Triangulation
t_trigger 6:55:25 UTC
ra 88.7150°
decl -11.8300°
Circular_text TITLE: GCN CIRCULAR NUMBER: 16752 SUBJECT: IPN Triangulation of GRB 140825A (very intense/long) DATE: 14/08/28 18:06:34 GMT FROM: Dmitry Svinkin at Ioffe Institute K. Hurley and J. Goldsten, on behalf of the MESSENGER NS GRB team, I. G. Mitrofanov, D. Golovin, M. L. Litvak, and A. B. Sanin, on behalf of the HEND-Odyssey GRB team, W. Boynton, C. Fellows, K. Harshman, H. Enos, and R. Starr, on behalf of the GRS-Odyssey GRB team, S. Golenetskii, R. Aptekar, V. Pal'shin, D. Frederiks, D. Svinkin, and T. Cline on behalf of the Konus-Wind team, A. von Kienlin, X. Zhang, A. Rau, V. Savchenko, E. Bozzo, and C. Ferrigno, on behalf of the INTEGRAL SPI-ACS GRB team, S. Barthelmy, J. Cummings, N. Gehrels, H. Krimm, and D. Palmer, on behalf of the Swift-BAT team, and D. M. Smith, on behalf of the RHESSI GRB team, report: The long-duration, very intense GRB 140825A has been observed by Konus-Wind, MESSENGER (GRNS), Mars Odyssey (HEND), Swift (BAT), RHESSI, and INTEGRAL (SPI-ACS), so far, at about 24925 s UT (06:55:25). 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: 88.715 (05h 54m 51s) -11.830 (-11d 49' 48") Corners: 88.611 (05h 54m 27s) -11.630 (-11d 37' 48") 88.657 (05h 54m 38s) -11.950 (-11d 57' 01") 88.818 (05h 55m 16s) -12.029 (-12d 01' 46") 88.772 (05h 55m 05s) -11.710 (-11d 42' 36") --------------------------------------------- The error box area is 169 sq. arcmin, and its maximum dimension is 27 arcmin (the minimum one is 9 arcmin). This box may be improved. A triangulation map is posted at http://www.ioffe.ru/LEA/GRBs/GRB140825_T24925/IPN/ The time history and spectrum will be given in a forthcoming GCN Circular.
GCN 16755 table
GRB_name GRB140825A
GCN_number 16755
Detection_method Konus-Wind Det
t_trigger 6:55:25.660 UTC
Circular_text TITLE: GCN CIRCULAR NUMBER: 16755 SUBJECT: Konus-Wind observation of GRB 140825A DATE: 14/08/29 17:23:14 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 long-duration, intense GRB 140825A (IPN triangulation: Hurley et al., GCN 16752) triggered Konus-Wind at T0=24925.66 s UT (06:55:25.660). The burst light curve shows several peaks with a total duration of ~14 s. The emission is seen up to ~10 MeV. As observed by Konus-Wind, the burst had a fluence of 3.7(-0.2,+0.2)x10^-5 erg/cm2, and a 64-ms peak energy flux, measured from T0+1.984 s, of 1.4(-0.2,+0.2)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+10.752 s) is best fit in the 20 keV - 10 MeV range by the GRB (Band) function with the following model parameters: the low-energy photon index alpha = -0.94(-0.07,+0.08), the high-energy photon index beta = -3.42(-1.36,+0.40), the peak energy Ep = 142(-7,+7) keV, chi2 = 86/84 dof. The spectrum near the peak count rate (measured from T0+2.048 to T0+2.560 s) is best fit in the 20 keV - 10 MeV range by the GRB (Band) function with the following model parameters: the low-energy photon index alpha = -0.44(-0.15,+0.21), the high-energy photon index beta = -3.42(-1.61,+0.59), the peak energy Ep = 208(-23,+18) keV, chi2 = 41/44 dof. The Konus-Wind light curve of this GRB is available at http://www.ioffe.ru/LEA/GRBs/GRB140825_T24925/ All the quoted errors are at the 90% confidence level. All the quoted values are preliminary.