Gamma-ray Burst 140809A

(All information courtesy of the instrument teams.)

Previous IAU Circulars

• none

• GCN NOTICE
  

  TITLE:           GCN/FERMI NOTICE
  NOTICE_DATE:     Sat 09 Aug 14 03:11:35 UT
  NOTICE_TYPE:     Fermi-GBM Flight Position
  RECORD_NUM:      45
  TRIGGER_NUM:     429246673
  GRB_RA:          153.733d {+10h 14m 56s} (J2000),
                   154.068d {+10h 16m 16s} (current),
                   152.568d {+10h 10m 16s} (1950)
  GRB_DEC:         +76.417d {+76d 25' 00"} (J2000),
                   +76.344d {+76d 20' 37"} (current),
                   +76.665d {+76d 39' 54"} (1950)
  GRB_ERROR:       15.85 [deg radius, statistical plus systematic]
  GRB_INTEN:       78 [cnts/sec]
  DATA_SIGNIF:     5.20 [sigma]
  INTEG_TIME:      2.048 [sec]
  GRB_DATE:        16878 TJD;   221 DOY;   14/08/09
  GRB_TIME:        11470.20 SOD {03:11:10.20} UT
  GRB_PHI:          88.00 [deg]
  GRB_THETA:        35.00 [deg]
  DATA_TIME_SCALE: 2.0480 [sec]
  HARD_RATIO:      0.14
  LOC_ALGORITHM:   3 (version number of)
  MOST_LIKELY:      97%  GRB
  2nd_MOST_LIKELY:   1%  Cyg X-1
  DETECTORS:       0,1,0, 0,0,0, 0,0,0, 1,0,0, 0,0,
  SUN_POSTN:       138.94d {+09h 15m 45s}  +15.90d {+15d 53' 45"}
  SUN_DIST:         60.97 [deg]   Sun_angle= -1.0 [hr] (East of Sun)
  MOON_POSTN:      294.14d {+19h 36m 35s}  -16.50d {-16d 30' 13"}
  MOON_DIST:       116.72 [deg]
  MOON_ILLUM:      96 [%]
  GAL_COORDS:      133.66, 37.26 [deg] galactic lon,lat of the burst (or transient)
  ECL_COORDS:      113.60, 58.26 [deg] ecliptic lon,lat of the burst (or transient)
  LC_URL:          http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2014/bn140809133/quicklook/glg_lc_medres34_bn140809133.gif
  COMMENTS:        Fermi-GBM Flight-calculated Coordinates.  
  COMMENTS:        This trigger occurred at longitude,latitude = 49.62,8.68 [deg].  
  COMMENTS:        The LC_URL file will not be created until ~15 min after the trigger.  
  

• GCN NOTICE
  

  TITLE:           GCN/FERMI NOTICE
  NOTICE_DATE:     Sat 09 Aug 14 03:12:04 UT
  NOTICE_TYPE:     Fermi-GBM Ground Position
  RECORD_NUM:      56
  TRIGGER_NUM:     429246673
  GRB_RA:          176.810d {+11h 47m 14s} (J2000),
                   177.007d {+11h 48m 02s} (current),
                   176.129d {+11h 44m 31s} (1950)
  GRB_DEC:         +66.910d {+66d 54' 36"} (J2000),
                   +66.829d {+66d 49' 44"} (current),
                   +67.188d {+67d 11' 16"} (1950)
  GRB_ERROR:       6.06 [deg radius, statistical only]
  DATA_SIGNIF:     8.30 [sigma]
  DATA_INTERVAL:   4.096 [sec]
  GRB_DATE:        16878 TJD;   221 DOY;   14/08/09
  GRB_TIME:        11470.20 SOD {03:11:10.20} UT
  GRB_PHI:          76.00 [deg]
  GRB_THETA:        44.00 [deg]
  E_RANGE:         44.032 - 279.965 [keV]
  LOC_ALGORITHM:   4143 (Gnd S/W Version number)
  SUN_POSTN:       138.94d {+09h 15m 45s}  +15.90d {+15d 53' 45"}
  SUN_DIST:         56.65 [deg]   Sun_angle= -2.5 [hr] (East of Sun)
  MOON_POSTN:      294.15d {+19h 36m 36s}  -16.50d {-16d 30' 11"}
  MOON_DIST:       115.67 [deg]
  MOON_ILLUM:      96 [%]
  GAL_COORDS:      132.45, 49.02 [deg] galactic lon,lat of the burst (or transient)
  ECL_COORDS:      135.42, 56.65 [deg] ecliptic lon,lat of the burst (or transient)
  LC_URL:          http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2014/bn140809133/quicklook/glg_lc_medres34_bn140809133.gif
  COMMENTS:        Fermi-GBM Ground-calculated Coordinates.  
  COMMENTS:        In the LAT Field-of-view.  
  COMMENTS:        This Notice was ground-generated -- not flight-generated.  
  COMMENTS:        The LC_URL file will not be created until ~15 min after the trigger.  
  

• GCN Circular #16674
  V.Shumkov, D.Denisenko, E. Gorbovskoy, V. Lipunov, M.Pruzhinskaya, V.Kornilov, D.Kuvshinov, N.Tyurina, P.Balanutsa, A.Kuznetsov, V.V.Chazov Lomonosov Moscow State University, Sternberg Astronomical Institute, Moscow State University
  K.Ivanov, S.Yazev, N.M.Budnev, O.Gres, O.Chuvalaev, V.A.Poleshchuk Irkutsk State University
  V.Yurkov, Yu.Sergienko, D.Varda, E.Sinyakov Blagoveschensk Educational State University, Blagoveschensk
  A. Tlatov, A.V. Parhomenko, D. Dormidontov, V.Sennik Kislovodsk Solar Station of the Pulkovo Observatory
  V.Krushinsky, I.Zalozhnih, A. Popov Ural Federal University, Yekaterinburg, Kourovka
  Hugo Levato and Carlos Saffe Instituto de Ciencias Astronomicas, de la Tierra y del Espacio (ICATE)
  Claudio Mallamaci, Carlos Lopez and Federico Podest Observatorio Astronomico Felix Aguilar (OAFA)
  MASTER II robotic telescope (MASTER-Net: http://observ.pereplet.ru) located in Kislovodsk was starting survey on the FERMI GRB140809A error-box (ra=11 15 14 dec=+71 00 36 r=6.040000) 52916 sec after trigger time at 2014-08-09 17:53:06 UT.
  During the observations of the error box of possible GRB 140809A (Fermi trigger 429246673) MASTER-Tunka auto-detection system discovered OT source at (RA, Dec) = 11h 46m 55.24s +66d 09m 59.3s on 2014-08-09.63454 UT ( Shumkov et al., Atel #6379). The OT unfiltered magnitude is 17.0m (limit 19.1m). The OT is seen in 6 images. There is no minor planet at this place. We have reference image without OT on 2014-04-21.58762 UT with unfiltered magnitude limit 20.0m.
  The new object is located 1.5" east and 17" north of the center of galaxy PGC 36760 = SDSS J114654.97+660942.3 (g=15.34 r=14.73 i=14.42) with z=0.0413. Discovery and reference images are available at: http://master.sai.msu.ru/static/OT/114655.24660959.3.png
  It is just a chance coincidence possible. Spectral and photometric confirmation is requested. Observations in X-rays and other wave bands are also strongly encouraged.
  The OT search is continuated.
  This message can be cited.
  
• GCN Circular #16675
  G. Masi, the Virtual Telescope Project - Italy, reports:
  I observed the field of GRB 140809A (FERMI trigger 429246673) with with the 17" robotic unit part of the Virtual Telescope (Ceccano, Italy: http://www.virtualtelescope.eu) at 9 Aug. 2014, 20:15:24 UT.
  An optical source is visible where described by Shumkov et al. (GCN 16674) in 180-seconds integration images, unfiltered. The position of the source is RA: 11 46 54.89 Decl.:+66 10 00.5 (J2000.0, mean residuals of 0.2") and the magnitude was estimated to be 17.4 assuming R mags for the reference stars from UCAC-4.
  The message may be cited.
• GCN Circular #16676
  NPM Kuin (UCL/MSSL), K.L.Page (U. Leicester) and F. Marshall (NASA/GSFC) report on behalf of the Swift/UVOT team:
  The Swift/UVOT began settled observations of the field of Fermi Trigger 429246673 (GRB 140809A) as follow-up on the GRB candidate reported detected by MASTER (Shumkov et al. (ATEL 6379) and confirmed by Masi (GCN Circ. No 16675). Swift observations started on 2014-08-10T00:55, 77.2 ks after the Fermi trigger.
  We have analysed 2.0 ks of XRT data collected between 77.2-79.2 ks after the trigger. No X-ray source was found, to an upper limit of 4.0x10^-3 count s^-1 (3-sigma; 0.3-10 keV).
  The UVOT observed the candidate field taking three v-band, one uvm2 and one uvw2 exposure. The new source is found at the edge of a galaxy (CG +11-15-003 at z=0.041372) and is only seen in the v-band, while the uv bands appear dominated by galaxy emission. The source position is consistent with that reported by Masi (GCN CIRC. No 16675).
  Preliminary 3-sigma upper limits using the UVOT photometric system (Breeveld et al. 2011, AIP Conf. Proc. 1358, 373) for the initial exposures are:

   Filter       T_start(s)   T_stop(s)      Exp(s)         Mag
  
   v            78122        79027          885         17.27 +/- 0.05
   m2           79032        79208          174         18.78 +/- 0.26
   w2           77214        78114          886         18.74 +/- 0.11
  

  Times given relative to 2014-08-09T03:11:10.2. The magnitudes in the table are not corrected for the Galactic extinction due to the reddening of E(B-V) = 0.01 in the direction of the burst (Schlegel et al. 1998).
  The source brightness remains close to the unfiltered magnitude reported by MASTER, and has no X-ray counterpart. Is therefore unlikely to be a GRB. LI> GCN Circular #16681
  Oliver Roberts (UCD) and V=C3=A9ronique Pelassa (UAH) reports on behalf of the Fermi GBM Team:
  "At 03:11:10.20 UT on the 9th of August 2014, the Fermi Gamma-Ray Burst Monitor triggered and located GRB 140809A (trigger 429246673 / 140809133), for which a possible optical transient was also detected by the MASTER II robotic telescope (Lipunov et al. 2014, GCN 16674). The GBM on-ground location is consistent with the OT position. The angle from the Fermi LAT boresight is 40 degrees.
  The GBM light curve consists of one bright pulse, followed by a sequence of shorter, dimmer pulses with a duration (T90) of about 70s (50-300 keV). The time-averaged spectrum from T0-14.6 s to T0+70.1 s is adequately fit by a power law function with an exponential high-energy cutoff. The power law index is -0.99 +/- 0.14 and the cutoff energy, parameterised as Epeak, is 507 +/- 192 keV.
  The event fluence (10-1000 keV) in this time interval is (2.10 +/- 0.04)E-06 erg/cm^2. The 1.024-sec peak photon flux measured starting from T0+1.28 s in the 10-1000 keV band is 1.39 +/- 0.18 ph/s/cm^2.
  The spectral analysis results presented above are preliminary; final results will be published in the GBM GRB Catalog."
• GCN Report 480.1
  GCN_Report 480.1 has been posted: http://gcn.gsfc.nasa.gov/reports/report_480_1.pdf by F.E. Marshall at NASA/GSFC titled: "Swift Observations of Fermi-GBM GRB 140809A"