GRB090305B

This page lists all entries on GRB090305B in GRBweb

Summary Fermi GBM GCN 8972 GCN 9004

Summary table
Variable Value Source
GRB_name_Fermi GRB090305052
T0 1:14:35.664 UTC Fermi_GBM
ra 135.0000° Fermi_GBM
decl 74.3000° Fermi_GBM
pos_error 5.51e+00° Fermi_GBM
T90 1.856 s Fermi_GBM
T90_error 0.58 s Fermi_GBM
T90_start 1:14:35.664 UTC Fermi_GBM
fluence 1.94e-06 erg/cm² Fermi_GBM
fluence_error 1.33e-08 erg/cm² Fermi_GBM
T100 1.856 s
GBM_located True
mjd 54895.05180166667 Fermi_GBM
Fermi GBM table
GRB_name_Fermi GRB090305052
trigger_name bn090305052
ra 135.0000°
decl 74.3000°
pos_error 5.51e+00°
datum 2009-03-05
t_trigger 1:14:35.728 UTC
T90 1.856 s
T90_error 0.58 s
T90_start 1:14:35.664 UTC
fluence 1.94e-06 erg/cm²
fluence_error 1.33e-08 erg/cm²
flux_1024 5.20e+00 erg/cm²/s
flux_1024_error 1.48e-01 erg/cm²/s
flux_1024_time -1.28e-01 erg/cm²/s
flux_64 9.05e+00 erg/cm²/s
flux_64_error 5.76e-01 erg/cm²/s
GCN 8972 table
GRB_name GRB090305B
GCN_number 8972
Detection_method Fermi GBM Det
t_trigger 1:14:35.720 UTC
ra 155.1000°
decl 68.1000°
Circular_text TITLE: GCN CIRCULAR NUMBER: 8972 SUBJECT: GRB090305B: Fermi GBM detection DATE: 09/03/10 17:50:24 GMT FROM: Colleen A. Wilson at NASA/MSFC/NSSTC Colleen A. Wilson-Hodge (NASA/MSFC) reports on behalf of the Fermi GBM Team: "At 01:14:35.72 UT on 05 March 2009, the Fermi Gamma-Ray Burst Monitor triggered and located GRB 090305B (trigger 257908477 / 090305052). The on-ground calculated location, using the GBM trigger data, is RA = 155.1, DEC = 68.1 (J2000 degrees, equivalent to 10 h 20 m, 68 d 06'), with an uncertainty of 5.4 degrees (radius, 1-sigma containment, statistical only; there is additionally a systematic error which is currently estimated to be 2 to 3 degrees). The angle from the Fermi LAT boresight is 40 degrees. The GBM light curve shows/consists of a single peak with a duration (T90) of about 2 s (8-1000 keV). The time-averaged spectrum from T0-0.5 s to T0+2.5 s is best fit by a Band function with Epeak = 770+/- 230 keV, alpha = -0.50 +/- 0.17, and beta = -1.9 +/- 0.2. The event fluence (8-1000 keV) in this time interval is (2.7 +/- 0.2)E-06 erg/cm^2. The 64-msec peak photon flux measured starting from T0+0.288 s in the 8-1000 keV band is 11 +/- 2 ph/s/cm^2. The spectral analysis results presented above are preliminary; final results will be published in the GBM GRB Catalog."
GCN 9004 table
GRB_name GRB090305B
GCN_number 9004
Detection_method Optical
Circular_text TITLE: GCN CIRCULAR NUMBER: 9004 SUBJECT: GRB090305B: MASTER-net prompt optical short burst observations DATE: 09/03/16 10:21:16 GMT FROM: Vladimir Lipunov at Moscow State U/Krylov Obs E. Gorbovskoy, V. Lipunov, V.Kornilov, A.Belinski, N.Shatskiy, N.Tyurina, D.Kuvshinov, P.Balanutsa, V.V.Chazov, P.V.Kortunov Sternberg Astronomical Institute, Moscow State University A. Tlatov, A.V. Parhomenko, Kislovodsk Solar Station of the Pulkovo Observatory V.Krushinski, I.Zalognikh, T.Kopytova Ural State University, Kourovka S.Yazev, K.Ivanov Irkutsk State University There are 6 MASTER Very Wide Field cameras located at Kislovodsk and Irkutsk with common FOW = 6000 square degrees (http://observ.pereplet.ru/). One of the four MASTER Very Wide Field Cameras located at Kislovodsk (D=50 mm, 4x1000 square degrees, 11 Mpx) has observed ~80% 1-sigma Fermi error box (Colleen A. Wilson-Hodge, GCN 8972) with 1s exposure during all night: 7 hours befoure, during and 1 hours after GRB Time without time gap between images. Our unfiltered images are calibrated relative to Tycho stars (V). The magnitude limit of the each emage is ~9.5 m at the edge of FOW. We do not detect OT inside part of the error box (Colleen A. Wilson-Hodge, GCN 8972) brighter than 9.2 mag before and after trigger time. We conclude in case that GRB inside our FOW that: 1). the optical fluence during the short 2 s GRBurst is limited by ~<= 1 x 10E-8 erg/cm_2 excluding possible host galaxy absorbtion. The event fluence (8-1000 keV) in this time interval is (2.7 +/- 0.2)E-06 erg/cm^2 (Colleen A. Wilson-Hodge, GCN 8972). So: 2). Optical-Fluence/Gamma-Fluence(8-1000 keV) ~ < 1/100 The same ratio for long GRB080319B is Optical-Fluence/Gamma-Fluence(8 - 1000 keV) ~ 1/140 (Naked Eye GRB, Racusin, Karpov et al., Nature, vol.455, 183, 2008). The film of our observations (from 10 s before and 15 s after GRB time) is available at http://observ.pereplet.ru/images/GRB090305B/GRB090305B_full2.gif White & black circles are the 1-sigma & 3-sigma+systematic (2 degrees) error boxes correspondingly. Black rectangle is the IPN error box (Palshin et al., private communication). The FOWs of the 2 cameras are available at http://observ.pereplet.ru/images/GRB090305B/FOW090305.png The reduction is continued. The message may be cited. mailto: lipunov@sai.msu.ru