GRB110820B

This page lists all entries on GRB110820B in GRBweb

Summary IPN GCN 12299 GCN 12301

Summary table
Variable Value Source
T0 21:27:48.054 UTC GCN_circulars,Konus-Wind Det
ra 157.5833° IPN
decl -54.6000° IPN
pos_error 2.00e+00° IPN
GBM_located False
mjd 55793.894306180555 GCN_circulars,Konus-Wind Det
IPN table
GRB_name GRB110820B
ra 157.5833°
decl -54.6000°
pos_error 2.00e+00°
GCN 12299 table
GRB_name GRB110820B
GCN_number 12299
Detection_method IPN Triangulation
ra 157.5830°
decl -54.6050°
Circular_text TITLE: GCN CIRCULAR NUMBER: 12299 SUBJECT: IPN triangulation of GRB 110820B (very long duration, extremely intense) DATE: 11/08/22 22:40:43 GMT FROM: Valentin Pal'shin at Ioffe Inst K. Hurley and J. Goldsten, on behalf of the MESSENGER NS GRB team, S. Golenetskii, R. Aptekar, E. Mazets, V. Pal'shin, D. Frederiks, D. Svinkin, and T. Cline, on behalf of the Konus-Wind team, S. Barthelmy, J. Cummings, N. Gehrels, H. Krimm, and D. Palmer, on behalf of the Swift-BAT team, D. M. Smith, R. P. Lin, J. McTiernan, R. Schwartz, and W. Hajdas, on behalf of the RHESSI GRB team, report: On 2011 August 20 at about 21:27:50 UT, an extremely intense, very long duration GRB was observed by Konus-Wind, MESSENGER, RHESSI, and Swift (BAT) (outside the coded field of view). We have triangulated it to a preliminary, 3 sigma error box whose area is 0.212 sq. deg. and whose coordinates are: ------------------------------------------------ RA(2000), deg Dec(2000), deg ------------------------------------------------ Center: 157.583 (10h 30m 20s) -54.605 (-54d 36' 16") Corners: 159.392 (10h 37m 34s) -54.329 (-54d 19' 45") 156.617 (10h 26m 28s) -54.836 (-54d 50' 09") 155.769 (10h 23m 05s) -54.841 (-54d 50' 27") 158.541 (10h 34m 10s) -54.362 (-54d 21' 44") ------------------------------------------------ Some improvement to this error box is possible. The time history and spectrum will be given in a forthcoming GCN Circular.
GCN 12301 table
GRB_name GRB110820B
GCN_number 12301
Detection_method Konus-Wind Det
t_trigger 21:27:48.054 UTC
Circular_text TITLE: GCN CIRCULAR NUMBER: 12301 SUBJECT: Konus-Wind observation of GRB 110820B DATE: 11/08/23 09:34:20 GMT FROM: Dmitry Frederiks at Ioffe Institute S. Golenetskii, R.Aptekar, D. Frederiks, E. Mazets, V. Pal'shin, P. Oleynik, M. Ulanov, D. Svinkin, and T. Cline on behalf of the Konus-Wind team, report: The long hard extremely intense GRB 110820B (localized by IPN: Hurley et al., GCN 12299) triggered Konus-Wind at T0=77268.054s UT (21:27:48.054) The event light curve shows two major bursting episodes separated by ~100 s. A weaker and softer emission is observed at the time between the two main pulses. The total duration of the burst is ~200s. The emission is seen up to ~10 MeV. The Konus-Wind light curve of this GRB is available at http://www.ioffe.ru/LEA/GRBs/GRB110820_T77268/ As observed by Konus-Wind the burst had a fluence of (2.5 0.3)x10-4 erg/cm2, and a 64-ms peak flux, measured from T0+3.136 s, of (2.6 0.4)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+191.488 s) is best fitted in the 20 keV - 10 MeV range by the GRB (Band) model, for which: the low-energy photon index alpha = -1.22 (-0.05, +0.06), the high energy photon index beta = -2.1 (-0.3, +0.2), the peak energy Ep = 481(-83, +90) keV, chi2 = 69/84 dof. The spectrum at the maximum count rate (measured from T0+0.256 to T0+3.840 s) is best fitted in the 20 keV - 10 MeV range by the GRB (Band) model, for which: the low-energy photon index alpha = -0.55 (-0.09, +0.09), the high energy photon index beta = -2.5 (-0.4, +0.2), the peak energy Ep = 483(-53, +60) keV, chi2 = 81/84 dof. All the quoted results are preliminary. All the quoted errors are at the 90% confidence level.