GRB130609B: 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 01:43:01 EST 2014
             Host Name: batevent1
   Current Working Dir: /local/data/batevent/batevent_reproc/trigger557828
======================================================================

  Trigger: 00557828      Segment: 000

  BAT Trigger Time: 392506731.072   [s; MET]
      Trigger Stop: 392506732.096   [s; MET]
               UTC: 2013-06-09T21:38:40.416520    [includes UTCF correction] 
       Where From?: TDRSS position message

  BAT 
    RA: 53.7539682175759   Dec: -40.1534346904126  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    11.03
     Image Trigger?:     NO
     Rate S/N Ratio:     44.4747119158742  [ if not an image trigger ]
     Image S/N Ratio:    11.03

  Analysis Position:   [ source = BAT ]
    RA: 53.7539682175759   Dec: -40.1534346904126  [deg; J2000]

  Refined Position:   [ source = BAT pre-slew burst ]
    RA: 53.7763308512089   Dec: -40.1700077063953  [deg; J2000]  
        { 03h 35m 06.3s , -40d 10' 12.0" }
         +/- 0.719130072931289 [arcmin] (estimated 90% radius based on SNR)
         +/- 0.231024776243211 [arcmin] (formal 1-sigma fit error)
    SNR: 48.7168461198664
 
  Angular difference between the analysis and refined position is 1.428375 arcmin
 
  Partial Coding Fraction: 0.4375    [ including projection effects ]

  Duration
     T90: 211.171999931335 +/- 17.0554920155477
        Measured from: 0.191999971866608
                   to: 211.363999903202     [s; relative to TRIGTIME]
     T50: 116.479999899864 +/- 41.0450455432533
        Measured from: 7.97200000286102
                   to: 124.451999902725     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: 16.7799999713898     
                   to: 17.7799999713898     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: -7.83600002527237     
                   to: 309.8599999547     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     5.721047   8.164473   7.901362   2.648463
           0.119386   0.129113   0.122205   0.108334 [error]
 Peak      0.190165   0.342102   0.406581   0.156839
           0.013369   0.016842   0.018138   0.014130 [error]

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

======================================================================
 
 
====== Table of the duration information =============================
 
        Value   tstart    tstop
T100  317.696   -7.836  309.860
T90   211.172    0.192  211.364
T50   116.480    7.972  124.452
Peak    1.000   16.780   17.780
 
 
====== 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      -1.222    -0.039      0.040       -           -               -         5.12e-03     -1.04e-04          1.04e-04      53.440   57
CPL     -1.217    -0.040      0.040     9997.080    -9997.080      -9997.080      5.14e-03     -1.03e-04          5.26e-04      53.500   56
 
 
=== 1-s peak spectral analysis ===
(Best model with acceptable fit: N/A)
 
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      -0.921     -0.085     0.086       -           -               -         7.44e-02     -3.68e-03          3.67e-03      53.180   57
CPL     -0.772     -0.187     0.348      484.471    -484.471      -484.471      8.66e-02     -8.95e-03          3.52e-02      52.580   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   1.60e-06  3.49e-06  5.98e-06  2.37e-05  1.64e-05  3.48e-05   erg/cm2
      90%_error_low -7.28e-08 -9.13e-08 -1.33e-07 -1.27e-06 -3.37e-07 -1.32e-06   erg/cm2
      90%_error_hi   7.44e-08  9.11e-08  1.32e-07  1.33e-06  3.38e-07  1.36e-06   erg/cm2
Peak flux       PL   6.81e-04  8.30e-03  1.08e-01  9.32e+00  4.89e-01  9.29e+00   ph/cm2/s
      90%_error_low 5.06e-05 7.72e-04 -5.14e-03 -4.02e-01 -2.35e-02 -3.04e-01   ph/cm2/s
      90%_error_hi   1.76e-04  2.16e-03  9.15e-03  6.78e-01  3.84e-02  9.20e-01   ph/cm2/s
 
Fluence        CPL   1.60e-06  3.49e-06  5.99e-06  2.35e-05  1.64e-05  3.61e-05   erg/cm2
      90%_error_low    N/A    -9.14e-08    N/A       N/A       N/A       N/A      erg/cm2
      90%_error_hi     N/A     9.12e-08    N/A       N/A       N/A       N/A      erg/cm2
Peak flux      CPL   1.70e+00  2.53e+00  2.70e+00  4.44e+00  8.51e+00  1.14e+01   ph/cm2/s
      90%_error_low -2.27e-01 -1.63e-01 -1.65e-01 -1.26e+00 -4.34e-01 -1.32e+00   ph/cm2/s
      90%_error_hi   2.00e-01  1.64e-01  1.82e-01  9.07e-01  4.34e-01  1.11e+00   ph/cm2/s
 
======================================================================

Image

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

#   RAcent    DECcent   POSerr    Theta     Phi              Peak Cts       SNR   Name
   53.7763   -40.1700   0.0039    32.0512   -69.4882         8.3039179     48.717 TRIG_00557828                 
 
Foreground time interval of the image:
 -7.836  12.029 (delta_t =  19.865 [sec])
Background time interval of the image:
-647.871 -628.939 (delta_t =  18.933 [sec])
-239.072  -7.836 (delta_t = 231.236 [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   -7.836 sec. to  309.860 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.22189     ( -0.0394164   0.0395254 )
Norm@50keV  : 5.11745E-03    ( -0.000103787   0.000103589 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          53.44 using 59 PHA bins.
# Reduced chi-squared =         0.9375 for     57 degrees of freedom 
# Null hypothesis probability =   6.095733e-01
 
Photon flux (15-150 keV)    in 317.7 sec: 0.602604 ( -0.013482  0.013547 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.63963e-05 ( -3.37385e-07  3.37563e-07 ) ergs/cm2
 

Cutoff power-law model

Time interval is from   -7.836 sec. to  309.860 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.21705     ( -0.0397983   0.0397191 )
Epeak [keV] : 9997.08      ( -9997.71 -9997.71 )
Norm@50keV  : 5.14146E-03    ( -0.000102562   0.00052672 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          53.50 using 59 PHA bins.
# Reduced chi-squared =         0.9554 for     56 degrees of freedom 
# Null hypothesis probability =   5.699556e-01
 
Photon flux (15-150 keV)    in 317.7 sec: 0.605649 ( -0.017395  0.010281 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.63918e-05 ( 0  0 ) ergs/cm2
 

1-s peak spectrum fit

Power-law model

Time interval is from   16.780 sec. to   17.780 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -0.920735     ( -0.0854782   0.0863704 )
Norm@50keV  : 7.44435E-02    ( -0.00368211   0.00367192 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          53.18 using 59 PHA bins.
# Reduced chi-squared =         0.9330 for     57 degrees of freedom 
# Null hypothesis probability =   6.190578e-01
 
Photon flux (15-150 keV)    in 1 sec: 0.489058 0.423526 0.366498 0.317967 0.277153 0.243181 0.215140 0.192135 0.173331 6.68283E-02 (    ) ph/cm2/s
Energy fluence (15-150 keV)             : 8.28896e-07 ( -4.48347e-08  4.49804e-08 ) ergs/cm2
 

Cutoff power-law model

Time interval is from   16.780 sec. to   17.780 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -0.771852     ( -0.187383   0.348036 )
Epeak [keV] : 484.471      ( -484.472 -484.472 )
Norm@50keV  : 8.65690E-02    ( -0.00895356   0.0352362 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          52.58 using 59 PHA bins.
# Reduced chi-squared =         0.9390 for     56 degrees of freedom 
# Null hypothesis probability =   6.050551e-01
 
Photon flux (15-150 keV)    in 1 sec: 8.50545 ( -0.43356  0.43355 ) ph/cm2/s
Energy fluence (15-150 keV)             : 8.24366e-07 ( -4.64369e-08  4.61966e-08 ) ergs/cm2
 

Time-resolved spectra

Distribution

T90 vs. Hardness ratio plot

T90                                   = 211.172 sec.
Hardness ratio (energy fluence ratio) = 1.71490393573

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

S(15-50 keV)  = 5.089574e-06
S(50-150 keV) = 1.1306597e-05

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 = 2.193899666965913E-01, IMY = 5.864165027239688E-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:
-647.871410 -628.938800
-239.072000 -7.836000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
337.9302 -36.9175    3.3  26.8  133.5   0.9267   3.5 ------	UNKNOWN                       
 37.1991 -29.4998    2.9  29.8 -103.1   1.1134   4.0 ------	UNKNOWN                       
  7.6798   7.3111    3.2  58.7 -159.1   4.7728   3.7 ------	UNKNOWN                       
  7.6969   7.4596    3.7  58.8 -159.1   4.9528   3.7 ------	UNKNOWN                       
 25.9761  -2.2279    2.3  50.9 -135.7   5.6624   5.0 ------	UNKNOWN                       

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

Time interval of the image:
-7.836000 12.028600
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
 75.7103 -83.8891    3.4  36.5   14.0   0.4515   3.4 ------	UNKNOWN                       
 53.7763 -40.1700    0.2  32.1  -69.5   8.3033  48.7 ------	UNKNOWN                       

Post-slew image of 15-350 keV band

Time interval of the image:
65.228590 840.618000
840.928000 963.026400
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
 98.1186 -69.1553    2.6  37.1   41.4   4.4600   4.4 ------	UNKNOWN                       
 15.9963 -23.8674    2.4  35.6  171.4   3.4982   4.8 ------	UNKNOWN                       
 53.7907 -40.1812    0.7   0.0   -2.9   7.9700  16.0 ------	UNKNOWN                       
 39.3250 -18.2641    3.8  25.2 -148.1   1.4900   3.0 ------	UNKNOWN                       
 49.8760  -9.8075    2.7  30.6 -121.8   3.3417   4.3 ------	UNKNOWN                       
 16.2410   7.3257    4.7  58.7 -159.2  11.2054   2.5 ------	UNKNOWN