Gamma-ray Burst 110906A

(All information courtesy of the instrument teams.)

Previous IAU Circulars

• none

• GCN/BACODINE POSITION NOTICE
  

  TITLE:           GCN/SWIFT NOTICE
  NOTICE_DATE:     Tue 06 Sep 11 16:15:23 UT
  NOTICE_TYPE:     Swift-BAT Slew GRB Position
  ID_NUM:          607
  GRB_RA:          296.890d {+19h 47m 34s} (J2000),
                   297.068d {+19h 48m 16s} (current),
                   296.126d {+19h 44m 30s} (1950)
  GRB_DEC:         -26.210d {-26d 12' 35"} (J2000),
                   -26.181d {-26d 10' 49"} (current),
                   -26.334d {-26d 20' 02"} (1950)
  GRB_ERROR:       3.75 [arcmin radius, statistical only]
  GRB_INTEN:       214306 [cnts]    Image_Peak=0 [image_cnts]
  TRIGGER_DUR:     13.800 [sec] 
  TRIGGER_INDEX:   9     Criteria: (S(15-50) OR H(50-150)) > 4.0 sigma  AND  B(15-150) > 6.0 sigma
  ENERGY_RANGE:    15-150 keV
  BKG_INTEN:       0 [cnts]
  BKG_TIME:        0.00 SOD {00:00:00.00} UT
  BKG_DUR:         0 [sec]
  GRB_DATE:        15810 TJD;   249 DOY;   11/09/06
  GRB_TIME:        44713.48 SOD {12:25:13.48} UT
  SOLN_STATUS:     0x4011
  RATE_SIGNIF:     0.00 [sigma]
  IMAGE_SIGNIF:    5.53 [sigma]
  SUN_POSTN:       165.01d {+11h 00m 01s}   +6.40d {+06d 23' 56"}
  SUN_DIST:        130.29 [deg]   Sun_angle= -8.8 [hr] (East of Sun)
  MOON_POSTN:      278.50d {+18h 33m 59s}  -21.67d {-21d 40' 14"}
  MOON_DIST:        17.55 [deg]
  MOON_ILLUM:      71 [%]
  GAL_COORDS:       14.27,-23.26 [deg] galactic lon,lat of the burst (or transient)
  ECL_COORDS:      294.04, -4.99 [deg] ecliptic lon,lat of the burst (or transient)
  COMMENTS:        SWIFT-BAT Slew GRB Coordinates.  
  COMMENTS:        A point_source was found.  
  COMMENTS:        This does not match any source in the ground catalog.
  COMMENTS:        This is probably a GRB.  
  COMMENTS:        High confidence of reality (silver-plated).  
  COMMENTS:        This Notice was ground-processed from flight-data.  
  COMMENTS:          
  

• red DSS finding chart ps-file
  
  
• GCN Circular #12332
  A. Copete, J. Grindlay (Harvard) J. Cummings, S. Barthelmy, C. Markwardt, N. Gehrels (NASA/GSFC)
  We report the detection of a burst by the BAT Slew Survey (BATSS) in the slew that started on 09/06/11 at 12:23:55 UT and lasted 94 sec. The trigger time is 12:25:13 UT. The ground-calculated position is RA, Dec = 296.891, -26.209 deg, which is

  RA  (J2000) = 19h 47m 33.9s
  Dec (J2000) = -26d 12' 32"
  

  with an uncertainty of 3.8 arcmin (90% confidence radius, incl. systematics). The trigger was issued as a result of simultaneous detections of 7.8 and 4.7 sigma from imaging in the overlapping energy bands of 15-150 keV and 15-50 keV, respectively. The burst mask-tagged lightcurve in the 15-150 keV band shows a monotonically rising profile from the time it enters the BAT FoV above 15% partial coding at T+0sec until T+6sec, followed by an approximately flat profile until the end of the slew at T+16sec.
  An independent ground analysis by J. Cummings revealed a 17-sec weak burst with a position of RA, Dec = 296.915, -26.231 deg, with 1-sigma error of 1 arcmin and consistent with the BATSS position. Detected count rates were 400 unweighted counts/sec at the peak and about 0.03 counts/det in the weighted image peak.
  Due to a Moon constraint for the next 3 days, no follow-up Swift ToO observations are planned at this time.