GRB250406B

This page lists all entries on GRB250406B in GRBweb

Summary GCN 40106 GCN 40107

Summary table
Variable Value Source
T0 5:56:40 UTC GCN_circulars,IPN Triangulation
ra 316.5210° GCN_circulars,IPN Triangulation
decl 45.1870° GCN_circulars,IPN Triangulation
GBM_located False
mjd 60771.24768518518 GCN_circulars,IPN Triangulation
GCN 40106 table
GRB_name GRB250406B
GCN_number 40106
Detection_method IPN Triangulation
t_trigger 5:56:40 UTC
ra 316.5210°
decl 45.1870°
Circular_text TITLE: GCN CIRCULAR NUMBER: 40106 SUBJECT: IPN triangulation of GRB 250406B (short/hard) DATE: 25/04/07 17:12:06 GMT FROM: Dmitry Svinkin at Ioffe Institute A.S. Kozyrev, D.V. Golovin, M.L. Litvak, I.G. Mitrofanov, and A.B. Sanin on behalf of the HEND/Mars Odyssey team, D. Svinkin, D. Frederiks, A. Lysenko, A. Ridnaia, and T. Cline on behalf of the Konus-Wind team, E. Burns on behalf of the IPN, S. Barthelmy, J. Cummings, H. Krimm, D. Palmer, and A. Tohuvavohu on behalf of the Swift-BAT team, and W. Boynton, C. Fellows, K. Harshman, H. Enos, R. Starr, and A.S. Gardner on on behalf of the GRS-Odyssey GRB team, report: The bright, short-duration GRB 250406B was detected by Konus-Wind, Mars-Odyssey (HEND), and Swift (BAT) at about 21400 s UT (05:56:40). 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: 316.521 (21h 06m 05s) +45.187 (+45d 11' 13") Corners: 317.243 (21h 08m 58s) +45.058 (+45d 03' 28") 315.809 (21h 03m 14s) +45.386 (+45d 23' 10") 315.796 (21h 03m 11s) +45.310 (+45d 18' 36") 317.227 (21h 08m 55s) +44.981 (+44d 58' 53") --------------------------------------------- The error box area is 289 sq. arcmin, and its maximum dimension is 1.078 deg (the minimum one is 4.53 arcmin). The Sun distance was 63 deg. This localization may be improved. A triangulation map and HEALPix FITS file are posted at http://www.ioffe.ru/LEA/GRBs/GRB250406_T21401/IPN/ The HEALPix triangulation map is the multi-order HEALPix in units of probability density. The Konus-Wind time history and spectrum will be given in a forthcoming GCN Circular.
GCN 40107 table
GRB_name GRB250406B
GCN_number 40107
Detection_method Konus-Wind Det
t_trigger 5:56:41.479 UTC
Circular_text TITLE: GCN CIRCULAR NUMBER: 40107 SUBJECT: Konus-Wind detection of GRB 250406B (short/hard) DATE: 25/04/07 17:14:04 GMT FROM: Dmitry Frederiks at Ioffe Institute D. Frederiks, A.Lysenko, A. Ridnaia, D. Svinkin, A. Tsvetkova, M. Ulanov, and T. Cline, on behalf of the Konus-Wind team, report: The bright, short-duration GRB 250406B (IPN localization: Kozyrev et al., GCN 40106). triggered Konus-Wind (KW) at T0=21401.479 s UT (05:56:41.479). The burst light curve shows a multi-peaked pulse, which starts at ~T0-0.032 s and has a duration of ~0.240 s. 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/GRB250406_T21401/ As observed by Konus-Wind, the burst had the total fluence of 2.54(-0.51,+0.62)x10^-6 erg/cm^2 and a 16-ms peak energy flux, measured from T0-0.016 s, of 3.06(-0.61,+0.69)x10^-5 erg/cm^2/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 - 15 MeV range by a power law with exponential cutoff (CPL) model: dN/dE ~ (E^alpha)*exp(-E*(2+alpha)/Ep) with alpha = -0.97(-0.10,+0.12) and Ep = 2118(-590,+818) keV (chi2 = 35/38 dof). Fitting this spectrum by a Band function yields the same values of alpha and Ep, and an upper limit on the high energy photon index beta of -2.15 (chi2 = 35/37 dof). All the quoted errors are estimated at the 68% confidence level. All the presented results are preliminary.