GRB080916A

This page lists all entries on GRB080916A in GRBweb

Summary Fermi GBM IPN Swift GCN 8237 GCN 8238 GCN 8239 GCN 8241 GCN 8243 GCN 8244 GCN 8249 GCN 8254 GCN 8259 GCN 8263 GCN 8264 GCN 8266 GCN 8284

Summary table
Variable Value Source
GRB_name_Fermi GRB080916406
T0 9:45:18 UTC GCN_circulars,Fermi GBM Det
ra 336.2758° Swift
decl -57.0230° Swift
pos_error 6.47e-05° Swift
T90 46.337 s Fermi_GBM
T90_error 7.173 s Fermi_GBM
T90_start 9:45:19.450 UTC Fermi_GBM
fluence 7.81e-06 erg/cm² Fermi_GBM
fluence_error 8.18e-08 erg/cm² Fermi_GBM
redshift 0.6890
T100 62.0 s
GBM_located False
mjd 54725.40645833333 GCN_circulars,Fermi GBM Det
Fermi GBM table
GRB_name_Fermi GRB080916406
trigger_name bn080916406
ra 336.3000°
decl -57.0000°
pos_error 3.00e+00°
datum 2008-09-16
t_trigger 9:45:18.938 UTC
T90 46.337 s
T90_error 7.173 s
T90_start 9:45:19.450 UTC
fluence 7.81e-06 erg/cm²
fluence_error 8.18e-08 erg/cm²
flux_1024 4.47e+00 erg/cm²/s
flux_1024_error 2.88e-01 erg/cm²/s
flux_1024_time 2.24e+00 erg/cm²/s
flux_64 7.10e+00 erg/cm²/s
flux_64_error 1.35e+00 erg/cm²/s
IPN table
GRB_name GRB080916A
ra 336.3000°
decl -57.0167°
pos_error 5.00e-02°
redshift 0.6890
Swift table
GRB_name GRB080916A
t_trigger 9:45:20 UTC
ra 336.2758°
decl -57.0230°
pos_error 6.47e-05°
T90 60.0 s
fluence 4.00e-06 erg/cm²
redshift 0.6890
GCN 8237 table
GRB_name GRB080916A
GCN_number 8237
Detection_method Swift Det
t_trigger 9:45:20 UTC
ra 336.3020°
decl -57.0220°
Circular_text TITLE: GCN CIRCULAR NUMBER: 8237 SUBJECT: GRB 080916: Swift detection of a burst with optical afterglow DATE: 08/09/16 10:03:53 GMT FROM: David Palmer at LANL H. Ziaeepour (UCL-MSSL), L. Vetere (PSU), W. H. Baumgartner (GSFC/UMBC), A. P. Beardmore (U Leicester), S. Campana (INAF-OAB), P. A. Evans (U Leicester), C. Gronwall (PSU), H. A. Krimm (CRESST/GSFC/USRA), N. P. M. Kuin (MSSL), V. Mangano (INAF-IASFPA), J. Mao (INAF-OAB), S. R. Oates (UCL-MSSL), K. L. Page (U Leicester), D. M. Palmer (LANL), B. Preger (ASDC), P. Romano (INAF-IASFPA), T. Sakamoto (NASA/UMBC), M. Stamatikos (NASA/ORAU), R. L. C. Starling (U Leicester) and T. N. Ukwatta (GSFC/GWU) report on behalf of the Swift Team: At 09:45:20 UT, the Swift Burst Alert Telescope (BAT) triggered and located GRB 080916 (trigger=324895). Swift slewed immediately to the burst. The BAT on-board calculated location is RA, Dec 336.302, -57.022 which is RA(J2000) = 22h 25m 12s Dec(J2000) = -57d 01' 17" with an uncertainty of 3 arcmin (radius, 90% containment, including systematic uncertainty). The BAT light curve showed a double-peaked structure with a duration of about 60 sec. The peak count rate was ~5000 counts/sec (15-350 keV), at ~0 sec after the trigger. The XRT began observing the field at 09:46:30.8 UT, 70.2 seconds after the BAT trigger. Using promptly downlinked data we find an uncatalogued X-ray source located at RA, Dec 336.27802, -57.02190 which is equivalent to: RA(J2000) = 22h 25m 6.72s Dec(J2000) = -57d 01' 18.8" with an uncertainty of 3.3 arcseconds (radius, 90% containment). This location is 46 arcseconds from the BAT onboard position, within the BAT error circle. A power-law fit to a spectrum formed from promptly downlinked event data gives a column density consistent with the Galactic value of 1.83e+20 cm^-2 (Kalberla et al. 2005). UVOT took a finding chart exposure of 100 seconds with the White (160-650 nm) filter starting 76 seconds after the BAT trigger. There is a candidate afterglow in the rapidly available 2.7'x2.7' sub-image at RA(J2000) = 22:25:06.19 = 336.2758 DEC(J2000) = -57:01:22.8 = -57.0230 with a 1-sigma error radius of about 0.5 arc sec. This position is 5.9 arc sec. from the center of the XRT error circle. The estimated magnitude is 18.3 with a 1-sigma error of about 0.5 mag. No correction has been made for the expected extinction corresponding to E(B-V) of 0.02. Burst Advocate for this burst is H. Ziaeepour (hz AT mssl.ucl.ac.uk). Please contact the BA by email if you require additional information regarding Swift followup of this burst. In extremely urgent cases, after trying the Burst Advocate, you can contact the Swift PI by phone (see Swift TOO web site for information: http://www.swift.psu.edu/too.html.)
GCN 8238 table
GRB_name GRB080916A
GCN_number 8238
Detection_method Other
ra 336.2758°
decl -57.0234°
Circular_text TITLE: GCN CIRCULAR NUMBER: 8238 SUBJECT: GRB 080916: REM candidate afterglow DATE: 08/09/16 10:04:09 GMT FROM: Stefano Covino at Brera Astronomical Observatory D. Fugazza, S. Covino, P. D'Avanzo, L.A. Antonelli, L. Calzoletti, S. Campana, G. Chincarini, M.L. Conciatore, S. Cutini, V. D'Elia, F. D'Alessio, F. Fiore, P. Goldoni, D. Guetta, C. Guidorzi, G.L. Israel, E. Maiorano, N. Masetti, A. Melandri, E. Meurs, L. Nicastro, E. Palazzi, E. Pian, S. Piranomonte, L. Stella, G. Stratta, G. Tagliaferri, G. Tosti, V.Testa, S.D. Vergani, F. Vitali report on behalf of the REM team: The robotic 60-cm REM telescope located at La Silla (Chile) observed automatically the field of the GRB 080916 on Sep 16 starting from about 20 s after the GRB time. We see a source not present in the 2MASS catalogue with approximately H~14.5 one minute after the burst at the coordinates RA=22:25:06.19, DEC=-57:01:24.1 (error 1 arcsec). Further observations are in progress. [GCN OPS NOTE(16sep08): The author requests that people should use the 8238 Circular as the primary source. The 8239 Circular was the result of multiple efforts of a distributed team.] [GCN OPS NOTE(16sep08): Per author's request, DM was removed from the author list.]
GCN 8239 table
GRB_name GRB080916A
GCN_number 8239
Detection_method Other
ra 336.2755°
decl -57.0228°
Circular_text TITLE: GCN CIRCULAR NUMBER: 8239 SUBJECT: GRB 080916: REM detection of the NIR afterglow DATE: 08/09/16 11:45:46 GMT FROM: Angelo Antonelli at Obs. Astro. di Roma L.A. Antonelli, S. Covino, P. D'Avanzo, D. Fugazza, L. Calzoletti, S. Campana, G. Chincarini, M.L. Conciatore, S. Cutini, V. D'Elia, F. D'Alessio, F. Fiore, P. Goldoni, D. Guetta, C. Guidorzi, G.L. Israel, E. Maiorano, N. Masetti, A. Melandri, E. Meurs, L. Nicastro, E. Palazzi, E. Pian, S. Piranomonte, L. Stella, G. Stratta, G. Tagliaferri, G. Tosti, V.Testa, S.D. Vergani, F. Vitali report on behalf of the REM team: The robotic 60-cm REM telescope located at La Silla (Chile) observed automatically the field of the GRB 080916 (Ziaeepour et al. GCN 8237) on Sep 16 starting observations about 19.4 sec after the GRB. We clearly detect a NIR source at RA(J2000)=22:25:06.13, Dec.(J2000) =-57:01:22 with an uncertainty of 1" which is compatible with the position of the UVOT source (Ziaeepour et al. GCN 8237). At the beginning of the observation the source had a magnitude H=14.0+/-0.3, calibrated against 2MASS. The source showed a clear fading behavior during the REM observation. [GCN OPS NOTE(16sep08): The author requests that people should use the 8238 Circular as the primary source. The 8239 Circular was the result of multiple efforts of a distributed team.] [GCN OPS NOTE(16sep08): Per author's request, DM was removed from the author list.]
GCN 8241 table
GRB_name GRB080916A
GCN_number 8241
Detection_method Swift-XRT Det
ra 336.2768°
decl -57.0227°
Circular_text TITLE: GCN CIRCULAR NUMBER: 8241 SUBJECT: GRB 080916A: Enhanced Swift-XRT position DATE: 08/09/16 15:21:27 GMT FROM: Phil Evans at U of Leicester P.A. Evans, M.R. Goad, J.P. Osborne and A.P. Beardmore (U. Leicester) report on behalf of the Swift-XRT team. Using 2559 s of XRT Photon Counting mode data and 3 UVOT images for GRB 080916A, we find an astrometrically corrected X-ray position (using the XRT-UVOT alignment and matching UVOT field sources to the USNO-B1 catalogue): RA, Dec = 336.27682, -57.02271 which is equivalent to: RA (J2000): 22h 25m 6.44s Dec (J2000): -57d 01' 21.7" with an uncertainty of 1.8 arcsec (radius, 90% confidence). This position may be improved as more data are received. The latest position can be viewed at http://www.swift.ac.uk/xrt_positions. Position enhancement is described by Goad et al. (2007, A&A, 476, 1401 http://www.swift.ac.uk/xrt_positions/Goad.pdf), the current algorithm is an extension of this method. This circular was automatically generated, and is an official product of the Swift-XRT team.
GCN 8243 table
GRB_name GRB080916A
GCN_number 8243
Detection_method Swift-BAT Det
ra 336.2890°
decl -57.0260°
Circular_text TITLE: GCN CIRCULAR NUMBER: 8243 SUBJECT: GRB 080916A, Swift-BAT refined analysis DATE: 08/09/16 17:06:23 GMT FROM: Scott Barthelmy at NASA/GSFC W. Baumgartner (GSFC/UMBC), S. D. Barthelmy (GSFC), J. Cummings (GSFC/UMBC), E. Fenimore (LANL), N. Gehrels (GSFC), H. Krimm (GSFC/USRA), C. Markwardt (GSFC/UMD), K. McLean (GSFC/UMD), D. Palmer (LANL), A. Parsons (GSFC), T. Sakamoto (GSFC/UMBC), G. Sato (ISAS), M. Stamatikos (GSFC/ORAU), J. Tueller (GSFC), T. Ukwatta (GWU), H. Ziaeepour (UCL-MSSL) (i.e. the Swift-BAT team): Using the data set from T-240 to T+962 sec from the recent telemetry downlink, we report further analysis of BAT GRB 080916A (trigger #324895) (Ziaeepour, et al., GCN Circ. 8237). The BAT ground-calculated position is RA, Dec = 336.289, -57.026 deg, which is RA(J2000) = 22h 25m 09.3s Dec(J2000) = -57d 01' 33.7" with an uncertainty of 1.0 arcmin, (radius, sys+stat, 90% containment). The partial coding was 82%. The mask-weighted light curve shows two overlapping FRED peaks starting at ~T-3 sec and ending at ~T+100 sec. T90 (15-350 keV) is 60 +- 7 sec (estimated error including systematics). The time-averaged spectrum from T-2.4 to T+88.6 sec is best fit by a power law with an exponential cutoff. This fit gives a photon index 1.17 +- 0.21, and Epeak of 94.6 +- 23.0 keV (chi squared 48.0 for 56 d.o.f.). For this model the total fluence in the 15-150 keV band is 4.0 +- 0.1 x 10^-6 erg/cm2 and the 1-sec peak flux measured from T+1.25 sec in the 15-150 keV band is 2.7 +- 0.2 ph/cm2/sec. A fit to a simple power law gives a photon index of 1.63 +- 0.05 (chi squared 64.5 for 57 d.o.f.). All the quoted errors are at the 90% confidence level. The results of the batgrbproduct analysis are available at http://gcn.gsfc.nasa.gov/notices_s/324895/BA/
GCN 8244 table
GRB_name GRB080916A
GCN_number 8244
Detection_method Swift Other
Circular_text TITLE: GCN CIRCULAR NUMBER: 8244 SUBJECT: GRB 080916A: Swift XRT refined analysis DATE: 08/09/16 17:19:57 GMT FROM: Rhaana Starling at U of Leicester R.L.C. Starling (U. Leicester) and H. Ziaeepour (MSSL-UCL) report on behalf of the Swift-XRT team: We have analysed the first two orbits of Swift XRT data for GRB 080916A (Ziaeepour et al., GCN Circ. 8237) from T0+70 s to T0+7440 s with total exposure time 3.4 ks. The enhanced X-ray position is given in Evans et al., GCN Circ. 8241. The light curve can be represented by a 5-segment broken power law with an initial decay alpha1=1.3+0.4/-0.6 breaking at Tbk1=102+4/-6 s to a steep decay of alpha2=3.5+/-0.3 until Tbk2=190+25/-13 s. The light curve then flattens to alpha3=1.07+0.06/-0.3 and breaks at Tbk3=690+150/-140 s to a further steep decay of alpha4=2.9+2/-0.8. From Tbk4=1270+240/-220 s the decay becomes shallow again with alpha5=0.3+/-0.2. The spectrum from 3.2 ks of Photon Counting mode data can be fit with an absorbed power law with photon index Gamma=2.1+/-0.2 and intrinsic absorption (in excess of the Galactic value of 1.8e20 cm-2) of nH=(2.6+0.7/-0.6)e21 cm-2. This is consistent with the spectrum formed from the initial 170 s of Windowed Timing mode data. The observed (unabsorbed) count rate to flux conversion is 1 count/s = 4.0e-11 (6.8e-11) erg/cm2/s. The predicted count rate at T+24hr would be approximately 0.1 count/s if the decay continues on the current plateau-like phase. This circular is an official product of the Swift-XRT team.
GCN 8249 table
GRB_name GRB080916A
GCN_number 8249
Detection_method Swift-UVOT Det
ra 336.2758°
decl -57.0230°
Circular_text TITLE: GCN CIRCULAR NUMBER: 8249 SUBJECT: GRB080916A: Refined Swift/UVOT Observations DATE: 08/09/16 19:58:10 GMT FROM: Samantha Oates at MSSL S. R. Oates (UCL-MSSL) and H. Ziaeepour (UCL-MSSL) report on behalf of the Swift/UVOT team: The Swift/UVOT began settled observations of the field of GRB 080916A, 78s after the BAT trigger (Ziaeepour et al., GCN 8237). We detect the afterglow in all of the UVOT filters at the position: RA(J2000) = 22:25:06.20 DEC(J2000) = -57:01:22.9 with an estimated uncertainty of 0.5 arcsec (radius, 90% confidence). This position is consistent with the UVOT enhanced XRT position (Evans et al., GCN 8241) and the REM position (Fugazza et al., GCN 8238). UVOT magnitudes are reported below for the finding charts (fc) and images: Filter Tstart(s) Tstop Expo(s) Magnitude/3sigUL ----------------------------------------------------- white (fc) 78 178 98 18.33 +/- 0.06 white 872 972 98 18.47 +/- 0.06 v (fc) 182 582 393 17.55 +/- 0.06 v 978 1378 393 18.39 +/- 0.11 b 1458 1477 19 18.90 +/- 0.35 u 538 658 19 17.53 +/- 0.19 w1 613 633 19 18.25 +/- 0.39 m2 741 1565 39 18.42 +/- 0.40 w2 692 864 39 18.75 +/- 0.37 ----------------------------------------------------- These magnitudes are not corrected for the Galactic extinction corresponding to a reddening of E{B-V} = 0.02 mag (Schlegel et al. 1998). The photometry is on the UVOT flight system described in Poole et al. (2008,MNRAS,383,627).
GCN 8254 table
GRB_name GRB080916A
GCN_number 8254
Detection_method Other
Circular_text TITLE: GCN CIRCULAR NUMBER: 8254 SUBJECT: GRB080916A: Spectroscopic redshift DATE: 08/09/17 07:35:16 GMT FROM: Johan U. Fynbo at U.Copenhagen J. P. U. Fynbo, D. Malesani, J. Hjorth, J. Sollerman, C. C. Thoene (DARK), report on behalf of a larger collaboration. We observed the field of GRB 080916A (Ziaeepour et al., GCN 8237) with the ESO VLT equipped with FORS1. Observations started on 2008 Sep 17.097 UT, 17.1 hr after the burst, for a total exposure time of 1 hr with the 300V grism. Based on MgII absorption and emission lines from [OII] and [OIII] we infer a redshift for GRB080916A of z=0.689 (based a preliminary wavelength calibration). We acknowledge excellent support from the observing staff at Paranal, in particular Dominique Naef, Heidi Korhonen and Chris Lidman.
GCN 8259 table
GRB_name GRB080916A
GCN_number 8259
Detection_method Konus-Wind Det
t_trigger 9:45:21.715 UTC
Circular_text TITLE: GCN CIRCULAR NUMBER: 8259 SUBJECT: Konus-Wind observation of GRB 080916A DATE: 08/09/17 14:31:01 GMT FROM: Valentin Pal'shin at Ioffe Inst S. Golenetskii, R. Aptekar, E. Mazets, V. Pal'shin, D. Frederiks, P. Oleynik, D. Svinkin, M. Ulanov and T. Cline, on behalf of the Konus-Wind team report: The long GRB 080916A (Swift-BAT trigger # 324895: Ziaeepour et al., GCN 8237, Baumgartner et al. 8243) triggered Konus-Wind at T0=35121.715 s UT (09:45:21.715). The burst light curve shows a single pulse with a duration of ~40 s. As observed by Konus-Wind the burst had a fluence of 5.54(-0.66, +0.79)x10^-6 erg/cm2, and a 256-ms peak flux measured from T0+1.024 s of 1.05(-0.40, +0.41)x10^-6 erg/cm2/s (both in the 20 keV - 1 MeV energy range). The time-integrated spectrum of the burst (from T0 to T0+33.024 s) is well fitted (in the 20 keV-1 MeV range) by a power law with exponential cutoff model: dN/dE ~ (E^alpha)*exp(-E*(2+alpha)/Ep) with alpha = -1.00(-0.32, +0.38), and Ep = 129(-21, +33) keV (chi2 = 32.0/51 dof). Fitting by GRBM (Band) model yields only an upper limit on the high energy photon index: beta < -2.43. All the quoted errors are at the 90% confidence level. Assuming z = 0.689 (Fynbo et al., GCN 8254) and a standard cosmology model with H_0 = 70 km/s/Mpc, Omega_M = 0.27, Omega_\Lambda = 0.73, the isotropic energy release E_iso ~7x10^51 erg, the peak luminosity (L_iso)_max ~ 2x10^51 erg/s, and Ep_rest ~220 keV. The Konus-Wind light curve of this GRB is available at http://www.ioffe.rssi.ru/LEA/GRBs/GRB080916_T35121/
GCN 8263 table
GRB_name GRB080916A
GCN_number 8263
Detection_method Fermi GBM Det
t_trigger 9:45:18 UTC
ra 331.5000°
decl -58.1000°
Circular_text TITLE: GCN CIRCULAR NUMBER: 8263 SUBJECT: GRB 080916A: Fermi GBM detection DATE: 08/09/17 22:39:42 GMT FROM: Elisabetta Bissaldi at MPE E. Bissaldi (MPE), S. McBreen (MPE), C.A. Wilson-Hodge (NASA/MSFC) and A. von Kienlin (MPE) report on behalf of the Fermi GBM Team: "At 09:45:18 UT on 16 September 2008, the Fermi Gamma-ray Burst Monitor triggered and located GRB 080916A (trigger 243251119 / 080916406), which was also detected by Swift (Ziaeepour et al., GCN 8237) and Konus-Wind (Golenetskii et al., GCN 8259). The on-ground calculated location, using the Fermi GBM trigger data, is RA = 331.5, Dec = -58.1 (equivalent to J2000 22h 06m, -58d 06'), with a statistical uncertainty of 3.2 degrees (radius, 1-sigma containment; there is additionally a systematic error which is currently estimated to be 2 to 3 degrees). This position is 2.8 deg from the Swift refined position (Evans et al., GCN 8241). The angle from the Fermi LAT boresight to the Swift position is 76 degrees. This long GRB consists of several peaks, with the brightest one lasting from T0 to T0+13 s and a second peak from T0+13 s to T0+24 s followed by weaker emission. T90 (25-1000 keV) is about 60 sec, in agreement with the Swift-BAT refined analysis (Baumgartner et al., GCN 8243), and T50 (25-1000 keV) is about 25 s. The time-averaged spectrum from T0 to T0+58 sec is adequately fit by a power law function with an exponential high energy cutoff. The power law index is -0.9 +/-0.1 and the cutoff energy, parameterized as Epeak, is 109 +/- 9 keV. The fluence (25-1000 keV) is 1.5 (+/- 0.5)E-05 erg/cm2 and the peak flux (25-1000 keV) on the 1 s timescale is 4.5 (+/- 0.7) ph/cm2/s. The spectral analysis results presented above are preliminary; final results will be published in the Fermi GBM GRB Catalog."
GCN 8264 table
GRB_name GRB080916A
GCN_number 8264
Detection_method Other
Circular_text TITLE: GCN CIRCULAR NUMBER: 8264 SUBJECT: GRB 080916A: Rapid PROMPT Observations DATE: 08/09/17 22:57:02 GMT FROM: Rebecca Holmes at U.North Carolina R. Holmes, M. Schubel, J. Haislip, D. Reichart, M. Nysewander, A. LaCluyze, K. Ivarsen, J. A. Crain, A. Foster, T. Brennan, and A. Trotter report: Skynet observed the localization of GRB 080916A (Ziaeepour et al., GCN 8237) with four of the 16" PROMPT telescopes at CTIO beginning 56 seconds after the trigger in UBVRI. We detect the afterglow (Fugazza et al., GCN 8238) in I. At 56 seconds after the burst we measure I ~ 17.7 mag (calibrated to 5 USNO B1 stars).
GCN 8266 table
GRB_name GRB080916A
GCN_number 8266
Detection_method GROND
Circular_text TITLE: GCN CIRCULAR NUMBER: 8266 SUBJECT: GRB 080916A: GROND lightcurve DATE: 08/09/18 11:23:16 GMT FROM: Andrea Rossi at TLS Tautenburg A. Rossi (Tautenburg Obs.),T. Kruehler, J. Greiner, A. Yoldas, C. Clemens, R. Filgas (all MPE Garching), A. Kupcu Yoldas (ESO) and G. Szokoly (Eoetvoes Univ.,Budapest) report on behalf of the GROND team: GROND (Greiner et al. 2008, PASP 120, 405), mounted at the 2.2m ESO/MPI telescope at La Silla Observatory (Chile), started observations of the field of GRB 080916A (Ziaeepour et al. GCN #8237) in g'r'i'z'JHK at 23:57:34 UT on 2008-09-16, 14 hours after the burst trigger. We clearly detect the optical afterglow detected by UVOT (Ziaeepour et al. GCN #8237) and REM telescope (Fugazza et al. GCN #8238). Observations continued for 60 min and were repeated at the mid-time 06:40 UT for total 60 min. Calibrating the field on USNO-B1 stars, we derive the following r band magnitudes, not corrected for the Galactic foreground extinction corresponding to a reddening of E_(B-V)=0.019 mag (Schlegel et al. 1998): midtime(s) r er 52239 21.8 0.03 54054 21.9 0.04 74076 22.1 0.07 76260 22.3 0.07 The total r band light curve is well fitted by power law with index of 0.81+- 0.13. Assuming the optical light curve continues the decline with the same power law index, we predict r' band magnitudes 23.4 at 3 days after the burst.
GCN 8284 table
GRB_name GRB080916A
GCN_number 8284
Detection_method Suzaku WAM Det
Circular_text TITLE: GCN CIRCULAR NUMBER: 8284 SUBJECT: GRB080916A: Suzaku WAM observation of the prompt emission DATE: 08/09/23 14:59:42 GMT FROM: Kazutaka Yamaoka at Aoyama Gakuin U M. Suzuki, M. Kokubun, M. Ohno, T. Takahashi (ISAS/JAXA), K. Yamaoka, S. Sugita (Aoyama Gakuin U.), Y.E. Nakagawa, T. Tamagawa (RIKEN), T. Uehara, T. Takahashi, Y. Fukazawa, C. Kira, Y. Hanabata (Hiroshima U.), M. Tashiro, Y. Terada, Y. Urata, A. Endo, K. Onda, N. Kodaka, K. Morigami, T. Sugasahara, W. Iwakiri (Saitama U.), T. Enoto, K. Nakazawa, K. Makishima (Univ. of Tokyo), E. Sonoda, M. Yamauchi, H. Tanaka, R. Hara, N. Ohmori (Univ. of Miyazaki), S. Hong (Nihon U.), on behalf of the Suzaku WAM team, report: The long GRB080916A (Swift/BAT trigger #324895; Ziaeepour et al., GCN 8237) was detected by the Suzaku Wide-band All-sky Monitor (WAM) which covers an energy range of 50 keV - 5 MeV at 09:45:19.970 UT (=T0). The observed light curve shows a single peak at T0+0 s, followed by a second soft peak at ~T0+16 s with a total duration (T90) of about 20 seconds. The fluence in 100 - 500 keV was (2.57 +/- 0.32)x10^-6 erg/cm^2. The 1-s peak flux measured from T0+0 s was 1.54 (-0.12, +0.25) photons/cm^2/s in the same energy range. Preliminary result shows that the time-averaged spectrum from T0-5s to T0+10s is fit by a single power-law with a photon index of 1.58 +/- 0.29 (chi^2/d.o.f = 13.1/12) in 100 - 500 keV. All the quoted errors are at statistical 90% confidence level, in which the systematic uncertainties are not included. The light curves with 1/64 sec time resolution for this burst are now available at: http://www.astro.isas.jaxa.jp/suzaku/HXD-WAM/WAM-GRB/grb/trig/grb_table.html