GRB090408B

This page lists all entries on GRB090408B in GRBweb

Summary GCN 9111 GCN 9121 GCN 9125

Summary table
Variable Value Source
T0 19:46:38.539 UTC GCN_circulars,Konus-Wind Det
ra 43.9800° GCN_circulars,IPN Triangulation
decl 26.6100° GCN_circulars,IPN Triangulation
GBM_located False
mjd 54929.824057164355 GCN_circulars,Konus-Wind Det
GCN 9111 table
GRB_name GRB090408B
GCN_number 9111
Detection_method Optical
Circular_text TITLE: GCN CIRCULAR NUMBER: 9111 SUBJECT: GRB 090408B: MASTER II-Kourovka optical observations DATE: 09/04/08 18:33:14 GMT FROM: Vladimir Lipunov at Moscow State U/Krylov Obs V.Krushinski, I.Zalognikh, T.Kopytova Ural State University, Kourovka E. Gorbovskoy, V. Lipunov, V.Kornilov, A.Belinski, N.Shatskiy, N.Tyurina, D.Kuvshinov, P.Balanutsa, V.V.Chazov, P.V.Kortunov, A.Kuznetsov Sternberg Astronomical Institute, Moscow State University A. Tlatov, A.V. Parhomenko, Kislovodsk Solar Station of the Pulkovo Observatory K.Ivanov, S.Yazev, Irkutsk State University The MASTER II Wide Field Telescope located at Kourovka Observatory (Ural) (two telescopes with D=400 mm, FOW = 2x4 square degrees, 2x16 Mpx CCD on one NTM mount) has observed Swift error box (Stroh et al., GCN 9110) with 60s exposure started at 1h 27m after Trigger time (after sun set) simultaneously in two filters R and V. MASTER-II is the new site of the MASTER-Net (http://observ.pereplet.ru/). Actually, we observed from the city. Our images are calibrated relative to USNO B (R) & Tycho stars (V). The wether is not very good. We do not detect OT inside error box brighter ~17m (S/N=6). The reduction is continued. The message may be cited. mailto: lipunov@sai.msu.ru
GCN 9121 table
GRB_name GRB090408B
GCN_number 9121
Detection_method Konus-Wind Det
t_trigger 19:46:38.539 UTC
ra 41.0100°
decl 14.9200°
Circular_text TITLE: GCN CIRCULAR NUMBER: 9121 SUBJECT: Konus-Wind and Konus-RF observations of GRB 090408b DATE: 09/04/10 14:40:32 GMT FROM: Dmitry Frederiks at Ioffe Institute S. Golenetskii, R.Aptekar, E. Mazets, V. Pal'shin, D. Frederiks, P. Oleynik, M. Ulanov, and D. Svinkin on behalf of the Konus-Wind and Konus-RF teams, and T. Cline on behalf of the Konus-Wind team, report: The very bright long GRB 090408b triggered Konus-Wind at T0=71198.539 s UT (19:46:38.539), and Konus-RF instrument onboard CORONAS-PHOTON s/c at T0=71203.482 s UT (19:46:43.482). We have triangulated this burst to a preliminary Konus-Wind - Konus-RF annulus centered at RA(2000)=41.01, Dec(2000)=+14.92, whose radius is 11.6 1.3 deg (3 sigma). The Konus-Wind and Konus-RF light curves of this GRB are available at http://www.ioffe.ru/LEA/GRBs/GRB090408_T71198/ They show a multipeaked structure with a duration of ~8 s. The burst demonstartes strong spectral evolution, as observed by Konus-RF a hard part of the burst emission (above 500 keV) consists of several relatively narrow peaks, while soft emission time profile is more smooth. No emission is seen above 2500 kev. The time-integrated spectrum of the most intense part of the event (measured by Konus-Wind from T0 to T0+5.632 s) can be fitted (in the 20 - 2500 keV range) by GRB (Band) model for which: the low-energy photon index alpha = -0.67(-0.04, +0.04), the high energy photon index beta = -2.68(-0.09, +0.08), the peak energy Ep = 344(-14, +13) keV (chi2 = 107/61 dof). The spectrum of the most intense peak (measured by Konus-Wind from T0+2.816 to T0+3.082 s) is well fitted (in the 20 - 2500 keV range) by GRB (Band) model for which: the low-energy photon index alpha = -0.49 +/-0.09, the high energy photon index beta = -2.94 (-0.28, +0.20), the peak energy Ep = (431 +/- 30) keV (chi2 = 54/61 dof). The burst had a fluence of (2.84 +/- 0.17)x10-4 erg/cm2, and a 16-ms peak flux measured from T0+2.912 s of 3.4(-0.8, +0.6)x10-4 erg/cm2/s (both in the 20 - 2500 keV energy range). Due to uncertainties in the burst incident angles the quoted values are preliminary. All the quoted errors are at the 90% confidence level.
GCN 9125 table
GRB_name GRB090408B
GCN_number 9125
Detection_method IPN Triangulation
ra 43.9800°
decl 26.6100°
Circular_text TITLE: GCN CIRCULAR NUMBER: 9125 SUBJECT: GRB 090408b: IPN Triangulation DATE: 09/04/12 10:22:03 GMT FROM: Dmitry Frederiks at Ioffe Institute S. Golenetskii, R.Aptekar, D. Frederiks, E. Mazets, V. Pal'shin, and T. Cline on behalf of the Konus-Wind and Konus-RF teams, K. Hurley and T. Cline, on behalf of the Mars Odyssey and Konus GRB teams, 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, A. von Kienlin, G. Lichti, and A. Rau, and K. Hurley on behalf of the INTEGRAL SPI-ACS team, E. Costa, E. Del Monte, I. Donnarumma, Y. Evangelista, M. Feroci, I. Lapshov, F. Lazzarotto, L. Pacciani, M. Rapisarda, P. Soffitta, for the SuperAGILE team, G. Di Cocco, F. Fuschino, M. Galli, C. Labanti, M. Marisaldi, on behalf of the AGILE MCAL team report: Konus-Wind, Konus-RF, Mars-Odyssey (GRS and HEND), and INTEGRAL-SPI-ACS observed the intense GRB 090408b (Golenetskii et al., GCN 9121). It was also observed by AGILE-MCAL and SuperAGILE (outside the coded field of view). We have triangulated it to the following 3-sigma error box: ----------------------------------------------- RA(2000), deg Dec(2000), deg ----------------------------------------------- Center: 43.98 (02h 55m 56s) +26.61 (+26d 36' 36") Corners: 43.95 (02h 55m 48s) +27.59 (+27d 35' 24") 42.98 (02h 51m 55s) +27.78 (+27d 46' 48") 44.05 (02h 56m 12s) +25.64 (+25d 38' 24") 44.97 (02h 59m 53s) +25.49 (+25d 29' 24") ----------------------------------------------- The error box area is 1.48 sq. deg. This error box may be improved. IPN triangulation map is avalable at at http://www.ioffe.ru/LEA/GRBs/GRB090408_T71198/IPN --