GRB130806A: Summary Image Light curves Spectra Distribution Others

Analysis Summary

Notes:

• 1) No attempt has been made to eliminate the non-significant decimal places.
• 2) This batgrbproduct analysis is done using the HEASARC data.
• 3) This batgrbproduct analysis is using the flight position for the mask-weighting calculation.

======================================================================
                  BAT GRB EVENT DATA PROCESSING REPORT
    Process Script Ver: batgrbproduct v2.46
    Process Start Time: Sun Jan 12 00:04:53 EST 2014
             Host Name: batevent1
   Current Working Dir: /local/data/batevent/batevent_reproc/trigger565562
======================================================================

  Trigger: 00565562      Segment: 000

  BAT Trigger Time: 397450304.832   [s; MET]
      Trigger Stop: 397450305.856   [s; MET]
               UTC: 2013-08-06T02:51:33.954800    [includes UTCF correction] 
       Where From?: TDRSS position message

  BAT 
    RA: 35.8720478135784   Dec: 67.5299573117295  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    14.81
     Image Trigger?:     NO
     Rate S/N Ratio:     27.0370116691915  [ if not an image trigger ]
     Image S/N Ratio:    14.81

  Analysis Position:   [ source = BAT ]
    RA: 35.8720478135784   Dec: 67.5299573117295  [deg; J2000]

  Refined Position:   [ source = BAT pre-slew burst ]
    RA: 35.9031053959959   Dec: 67.537739782203  [deg; J2000]  
        { 02h 23m 36.7s , +67d 32' 15.9" }
         +/- 1.56742777556256 [arcmin] (estimated 90% radius based on SNR)
         +/- 0.756515051957937 [arcmin] (formal 1-sigma fit error)
    SNR: 16.0058609405508
 
  Angular difference between the analysis and refined position is 0.851541 arcmin
 
  Partial Coding Fraction: 0.953125    [ including projection effects ]

  Duration
     T90: 5.77999997138977 +/- 0.411611491093137
        Measured from: -4.24800002574921
                   to: 1.53199994564056     [s; relative to TRIGTIME]
     T50: 1.37599992752075 +/- 3.0508569055645
        Measured from: -0.388000011444092
                   to: 0.98799991607666     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: 0.319999992847443     
                   to: 1.31999999284744     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: -4.50800001621246     
                   to: 1.75599998235703     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     0.179299   0.138267   0.048626   0.008637
           0.012513   0.012647   0.010705   0.009070 [error]
 Peak      0.083778   0.057862   0.019566   0.003035
           0.005843   0.005515   0.004342   0.003624 [error]

     [ fluence units of on-axis counts / fully illuminated detector ] 

======================================================================
 
 
====== Table of the duration information =============================
 
        Value   tstart    tstop
T100    6.264   -4.508    1.756
T90     5.780   -4.248    1.532
T50     1.376   -0.388    0.988
Peak    1.000    0.320    1.320
 
 
====== Spectral Analysis Summary =====================================
 
Model      : spectral model: simple power-law (PL) and cutoff power-law (CPL)
Ph_index   : photon index: E^{Ph_index}
Ph_90err   : 90% error of the photon index
Epeak      : Epeak in keV
Epeak_90err: 90% error of Epeak
Norm       : normalization at 50 keV in both the PL model and CPL model
Nomr_90err : 90% error of the normalization
chi2       : Chi-Squared
dof        : degree of freedo
 
=== Time-averaged spectral analysis ===
(Best model with acceptable fit: PL)
 
Model Ph_index Ph_90err_low Ph_90err_hi  Epeak  Epeak_90err_low  Epeak_90err_hi  Norm       Nomr_90err_low    Norm_90err_hi    chi2    dof
PL      -2.363    -0.222      0.207       -           -               -         2.73e-03     -4.36e-04          4.32e-04      68.710   57
CPL     -1.660    -0.347      1.258       16.765      N/A           N/A         7.76e-03        N/A               N/A         67.340   56
 
 
=== 1-s peak spectral analysis ===
(Best model with acceptable fit: PL)
 
Model Ph_index Ph_90err_low Ph_90err_hi  Epeak  Epeak_90err_low  Epeak_90err_hi  Norm       Nomr_90err_low    Norm_90err_hi    chi2    dof
PL      -2.512     -0.230     0.213       -           -               -         6.93e-03     -1.15e-03          1.14e-03      48.160   57
CPL     -1.887      N/A       N/A           6.330      N/A           N/A         1.74e-02        N/A               N/A         46.830   56
 
 
=== Fluence/Peak Flux Summary ===
 
              Model    Band1     Band2     Band3     Band4     Band5     Total
                       15-25     25-50    50-100    100-350    15-150    15-350    keV
Fluence         PL   4.95e-08  5.41e-08  4.20e-08  5.37e-08  1.66e-07  1.99e-07   erg/cm2
      90%_error_low -6.27e-09 -5.98e-09 -8.89e-09 -1.89e-08 -2.07e-08 -3.20e-08   erg/cm2
      90%_error_hi   6.34e-09  5.89e-09  9.44e-09  2.52e-08  2.13e-08  3.68e-08   erg/cm2
Peak flux       PL   7.62e-01  4.25e-01  1.49e-01  6.83e-02  1.37e+00  1.40e+00   ph/cm2/s
      90%_error_low -9.89e-02 -4.66e-02 -3.16e-02 -2.35e-02 -1.38e-01 -1.41e-01   ph/cm2/s
      90%_error_hi   1.01e-01  4.60e-02  3.34e-02  3.07e-02  1.38e-01  1.41e-01   ph/cm2/s
 
Fluence        CPL    N/A      N/A      N/A      N/A      N/A      N/A      erg/cm2
      90%_error_low -6.27e-09 -5.98e-09 -8.89e-09 -1.89e-08 -2.07e-08 -3.20e-08   erg/cm2
      90%_error_hi   6.34e-09  5.89e-09  9.44e-09  2.52e-08  2.13e-08  3.68e-08   erg/cm2
Peak flux      CPL   7.41e-01  4.52e-01  1.34e-01  2.36e-02  1.35e+00  1.35e+00   ph/cm2/s
      90%_error_low -1.08e-01     N/A   -4.48e-02 -2.36e-02 -1.39e-01 -1.45e-01   ph/cm2/s
      90%_error_hi   1.01e-01     N/A    4.01e-02  3.14e-02  1.39e-01  1.41e-01   ph/cm2/s
 
======================================================================

Image

Pre-slew 15.0-350.0 keV image (Event data)

#   RAcent    DECcent   POSerr    Theta     Phi              Peak Cts       SNR   Name
   35.9031    67.5377   0.0120    12.3900   -70.1264         0.3797464     16.006 TRIG_00565562                 
 
Foreground time interval of the image:
 -4.508   1.756 (delta_t =   6.264 [sec])
Background time interval of the image:
-239.832  -4.508 (delta_t = 235.324 [sec])

Light Curves

Note: The mask-weighted lightcurves have units of either count/det or counts/sec/det, where a det is 0.4 x 0.4 = 0.16 sq cm.

Full-time range; 1 s binning

Other quick-look light curves:

• 64 ms binning (zoomed)
• 16 ms binning (zoomed)
• 8 ms binning (zoomed)
• 2 ms binning (zoomed)
• SN=5 or 10 s binning (full-time range)
• Raw light curve

Spectra

Notes:

• 1) The fitting includes the systematic errors.
• 2) When the burst includes telescope slew time periods, the fitting uses an average response file made from multiple 5-s response files through out the slew time plus single time preiod for the non-slew times, and weighted by the total counts in the corresponding time period using addrmf. An average response file is needed becuase a spectral fit using the pre-slew DRM will introduce some errors in both a spectral shape and a normalization if the PHA file contains a lot of the slew/post-slew time interval.
• 3) For fits to more complicated models (e.g. a power-law over a cutoff power-law), the BAT team has decided to require a chi-square improvement of more than 6 for each extra dof.

Time averaged spectrum fit using the average DRM

Power-law model

Time interval is from   -4.508 sec. to    1.756 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -2.36331     ( -0.222302   0.207001 )
Norm@50keV  : 2.73332E-03    ( -0.000435993   0.000431536 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          68.71 using 59 PHA bins.
# Reduced chi-squared =          1.206 for     57 degrees of freedom 
# Null hypothesis probability =   1.375440e-01
 
Photon flux (15-150 keV)    in 6.264 sec: 0.495142 ( -0.049062  0.049062 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.65715e-07 ( -2.06534e-08  2.13413e-08 ) ergs/cm2
 

Cutoff power-law model

Time interval is from   -4.508 sec. to    1.756 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.66013     ( -0.346825   1.25836 )
Epeak [keV] : 16.7655      (   )
Norm@50keV  : 7.76451E-03    (     )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          67.34 using 59 PHA bins.
# Reduced chi-squared =          1.203 for     56 degrees of freedom 
# Null hypothesis probability =   1.425901e-01
 
Photon flux (15-150 keV)    in 6.264 sec: 0.483256 ( -0.05108  0.049791 ) ph/cm2/s
Energy fluence (15-150 keV)             : 0 ( 0  0 ) ergs/cm2
 

1-s peak spectrum fit

Power-law model

Time interval is from    0.320 sec. to    1.320 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -2.51169     ( -0.229932   0.212834 )
Norm@50keV  : 6.93197E-03    ( -0.00115148   0.00114143 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          48.16 using 59 PHA bins.
# Reduced chi-squared =         0.8450 for     57 degrees of freedom 
# Null hypothesis probability =   7.914286e-01
 
Photon flux (15-150 keV)    in 1 sec: 1.37179 ( -0.13784  0.13781 ) ph/cm2/s
Energy fluence (15-150 keV)             : 6.95537e-08 ( -8.45106e-09  8.68471e-09 ) ergs/cm2
 

Cutoff power-law model

Time interval is from    0.320 sec. to    1.320 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.88726     (       )
Epeak [keV] : 6.33013      (   )
Norm@50keV  : 1.74217E-02    (     )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          46.83 using 59 PHA bins.
# Reduced chi-squared =         0.8363 for     56 degrees of freedom 
# Null hypothesis probability =   8.036105e-01
 
Photon flux (15-150 keV)    in 1 sec: 1.34580 ( -0.13921  0.1388 ) ph/cm2/s
Energy fluence (15-150 keV)             : 0 ( 0  0 ) ergs/cm2
 

Time-resolved spectra

Distribution

T90 vs. Hardness ratio plot

T90                                   = 5.78 sec.
Hardness ratio (energy fluence ratio) = 0.777427525649

S(15-50 keV) vs. S(50-150 keV) plot

S(15-50 keV)  = 1.035853e-07
S(50-150 keV) = 6.212897e-08

The dash-dotted line and the dashed line traces the fluences calculated from the Band function with Epeak = 15 and 150 keV, respectively. Both lines assume a canonical values of alpha = -1 and beta = -2.5.

Mask shadow pattern

IMX = 7.467981803750530E-02, IMY = 2.065985531786927E-01

Spacecraft aspect plot

Bright source in the pre-burst/pre-slew/post-slew images

Pre-burst image of 15-350 keV band

Time interval of the image:
-239.832000 -4.508000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
308.1162  40.9768    3.1  40.3  133.1   1.6349   3.8    1.5	Cyg X-3                       
326.0238  38.4951    0.0  34.9  111.9   0.7253   2.0   12.5	Cyg X-2                       
  3.7171  61.4217    2.2   2.9   77.1   0.7365   5.3 ------	UNKNOWN                       
 79.7142  36.2638    2.7  50.6  -44.4   3.3264   4.3 ------	UNKNOWN                       
 81.6607  39.2644    2.6  49.0  -48.3   3.3421   4.4 ------	UNKNOWN                       

Pre-slew background subtracted image of 15-350 keV band

Time interval of the image:
-4.508000 1.756000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
308.1645  40.8183    7.7  40.4  133.0  -0.0897  -1.5    8.4	Cyg X-3                       
326.0229  38.4835   14.4  34.9  111.9   0.0416   0.8   12.0	Cyg X-2                       
 44.9512  13.4672    2.2  57.1    3.2   0.7337   5.3 ------	UNKNOWN                       
 35.9031  67.5378    0.7  12.4  -70.1   0.3798  16.0 ------	UNKNOWN                       
 79.0260  35.1114    3.1  51.3  -43.0   0.4091   3.8 ------	UNKNOWN                       

Post-slew image of 15-350 keV band

Time interval of the image:
50.268600 305.468600
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
 29.3429  14.3759    2.1  53.3   24.1   4.7777   5.4 ------	UNKNOWN                       
 88.1028  71.0667    2.5  18.2 -108.6   0.7421   4.7 ------	UNKNOWN                       
 97.2755  54.2439    2.9  31.1  -79.6   1.0286   4.0 ------	UNKNOWN                       
107.7792  46.7177    2.1  41.1  -81.0   4.0657   5.4 ------	UNKNOWN