GRB140108A: 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: Mon Mar  3 23:41:09 EST 2014
             Host Name: batevent1
   Current Working Dir: /local/data/batevent/batevent_reproc/trigger583338
======================================================================

  Trigger: 00583338      Segment: 000

  BAT Trigger Time: 410894334.016   [s; MET]
      Trigger Stop: 410894334.528   [s; MET]
               UTC: 2014-01-08T17:18:42.521660    [includes UTCF correction] 
       Where From?: TDRSS position message

  BAT 
    RA: 325.177722335241   Dec: 58.7661610684908  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    9.2
     Image Trigger?:     NO
     Rate S/N Ratio:     16.0312195418814  [ if not an image trigger ]
     Image S/N Ratio:    9.2

  Analysis Position:   [ source = BAT ]
    RA: 325.177722335241   Dec: 58.7661610684908  [deg; J2000]

  Refined Position:   [ source = BAT pre-slew burst ]
    RA: 325.126765988942   Dec: 58.7486335651162  [deg; J2000]  
        { 21h 40m 30.4s , +58d 44' 55.1" }
         +/- 0.686445825781888 [arcmin] (estimated 90% radius based on SNR)
         +/- 0.20752684705495 [arcmin] (formal 1-sigma fit error)
    SNR: 52.0640557710195
 
  Angular difference between the analysis and refined position is 1.902780 arcmin
 
  Partial Coding Fraction: 0.7109375    [ including projection effects ]

  Duration
     T90: 95.2319999337196 +/- 3.22426050489663
        Measured from: -1.51599997282028
                   to: 93.7159999608994     [s; relative to TRIGTIME]
     T50: 79.7399999499321 +/- 0.277416667179266
        Measured from: 6.41200000047684
                   to: 86.1519999504089     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: 6.48800003528595     
                   to: 7.48800003528595     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: -24.9079999923706     
                   to: 103.260000050068     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     3.387824   4.397191   3.207993   0.830063
           0.075650   0.078376   0.068403   0.057072 [error]
 Peak      0.183621   0.268101   0.235907   0.055403
           0.010394   0.011643   0.011049   0.007651 [error]

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

======================================================================
 
 
====== Table of the duration information =============================
 
        Value   tstart    tstop
T100  128.168  -24.908  103.260
T90    95.232   -1.516   93.716
T50    79.740    6.412   86.152
Peak    1.000    6.488    7.488
 
 
====== 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      -1.534    -0.047      0.047       -           -               -         5.90e-03     -1.39e-04          1.39e-04      44.700   57
CPL     -1.505    -0.071      0.153      962.001    -962.001      -962.001      6.08e-03     -3.02e-04          9.98e-04      44.790   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      -1.424     -0.085     0.084       -           -               -         4.96e-02     -2.42e-03          2.42e-03      59.190   57
CPL     -1.093     -0.314     0.339      143.011     -47.572       941.949      7.19e-02     -2.09e-02          3.21e-02      55.910   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   9.97e-07  1.80e-06  2.48e-06  7.13e-06  7.14e-06  1.24e-05   erg/cm2
      90%_error_low -4.87e-08 -5.00e-08 -7.28e-08 -4.80e-07 -1.76e-07 -5.16e-07   erg/cm2
      90%_error_hi   4.98e-08  4.99e-08  7.26e-08  5.05e-07  1.76e-07  5.35e-07   erg/cm2
Peak flux       PL   1.90e+00  2.00e+00  1.49e+00  1.79e+00  6.07e+00  7.18e+00   ph/cm2/s
      90%_error_low -1.63e-01 -1.06e-01 -9.01e-02 -2.16e-01 -3.00e-01 -3.54e-01   ph/cm2/s
      90%_error_hi   1.67e-01  1.06e-01  8.96e-02  2.33e-01  3.00e-01  3.56e-01   ph/cm2/s
 
Fluence        CPL   9.98e-07  1.80e-06  2.48e-06  7.14e-06  7.14e-06  1.24e-05   erg/cm2
      90%_error_low -6.48e-08 -4.48e-08 -7.20e-08 -1.73e-06 -1.78e-07 -1.53e-06   erg/cm2
      90%_error_hi   4.93e-08  5.21e-08  7.66e-08  5.23e-07  1.75e-07  2.88e-07   erg/cm2
Peak flux      CPL   1.77e+00  2.05e+00  1.54e+00  1.25e+00  5.98e+00  6.61e+00   ph/cm2/s
      90%_error_low -1.98e-01 -1.19e-01 -1.02e-01 -3.54e-01 -3.12e-01 -4.87e-01   ph/cm2/s
      90%_error_hi   2.02e-01  1.20e-01  1.04e-01  5.20e-01  3.12e-01  5.95e-01   ph/cm2/s
 
======================================================================

Image

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

#   RAcent    DECcent   POSerr    Theta     Phi              Peak Cts       SNR   Name
  325.1268    58.7486   0.0037    25.2363   147.7404         5.0542843     52.064 TRIG_00583338                 
 
Foreground time interval of the image:
-24.908  11.485 (delta_t =  36.393 [sec])
Background time interval of the image:
-239.016 -24.908 (delta_t = 214.108 [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  -24.908 sec. to  103.260 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.53369     ( -0.0467632   0.0467481 )
Norm@50keV  : 5.90363E-03    ( -0.00013878   0.000138778 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          44.70 using 59 PHA bins.
# Reduced chi-squared =         0.7842 for     57 degrees of freedom 
# Null hypothesis probability =   8.816537e-01
 
Photon flux (15-150 keV)    in 128.2 sec: 0.743906 ( -0.01986  0.019972 ) ph/cm2/s
Energy fluence (15-150 keV)             : 7.14296e-06 ( -1.75922e-07  1.76148e-07 ) ergs/cm2
 

Cutoff power-law model

Time interval is from  -24.908 sec. to  103.260 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.53111     ( -0.0440502   0.180204 )
Epeak [keV] : 9997.92      ( -9997.96 -9997.96 )
Norm@50keV  : 5.91997E-03    ( -0.00013922   0.00116014 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          44.70 using 59 PHA bins.
# Reduced chi-squared =         0.7983 for     56 degrees of freedom 
# Null hypothesis probability =   8.609931e-01
 
Photon flux (15-150 keV)    in 128.2 sec: 0.744079 ( -0.022756  0.019561 ) ph/cm2/s
Energy fluence (15-150 keV)             : 7.14443e-06 ( -1.78199e-07  1.74674e-07 ) ergs/cm2
 

1-s peak spectrum fit

Power-law model

Time interval is from    6.488 sec. to    7.488 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.42447     ( -0.0848293   0.0844175 )
Norm@50keV  : 4.95578E-02    ( -0.00242502   0.00242142 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          59.19 using 59 PHA bins.
# Reduced chi-squared =          1.038 for     57 degrees of freedom 
# Null hypothesis probability =   3.954461e-01
 
Photon flux (15-150 keV)    in 1 sec: 6.06971 ( -0.30013  0.30041 ) ph/cm2/s
Energy fluence (15-150 keV)             : 4.76585e-07 ( -2.57891e-08  2.5908e-08 ) ergs/cm2
 

Cutoff power-law model

Time interval is from    6.488 sec. to    7.488 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.09255     ( -0.314424   0.338587 )
Epeak [keV] : 143.011      ( -47.5717 941.947 )
Norm@50keV  : 7.19274E-02    ( -0.0208709   0.0320526 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          55.91 using 59 PHA bins.
# Reduced chi-squared =         0.9983 for     56 degrees of freedom 
# Null hypothesis probability =   4.783473e-01
 
Photon flux (15-150 keV)    in 1 sec: 5.97731 ( -0.31228  0.31228 ) ph/cm2/s
Energy fluence (15-150 keV)             : 4.66573e-07 ( -2.77696e-08  2.76922e-08 ) ergs/cm2
 

Time-resolved spectra

Distribution

T90 vs. Hardness ratio plot

T90                                   = 95.232 sec.
Hardness ratio (energy fluence ratio) = 1.38159353053

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

S(15-50 keV)  = 2.7929529e-06
S(50-150 keV) = 4.350004e-06

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 = -3.985814177049650E-01, IMY = -2.515799622929416E-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:
-239.016000 -24.908000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
254.2142  35.4018    4.8  26.0  -15.6  -0.4875  -2.4   12.4	Her X-1                       
288.8078  10.9377    3.0  38.5  -91.7   2.6302   3.8    0.7	GRS 1915+105                  
299.5913  35.1964    0.7  18.0 -128.7   3.1827  16.1    0.3	Cyg X-1                       
308.0871  40.9398    4.7  18.6 -157.0   0.4748   2.5    1.3	Cyg X-3                       
326.0465  38.2240    4.5  31.6 -170.2   0.5725   2.6    8.3	Cyg X-2                       
220.8443  56.5081    2.7  37.6   41.1   1.5394   4.3 ------	UNKNOWN                       

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

Time interval of the image:
-24.908000 11.484610
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
254.5480  35.5246    0.0  25.7  -15.8  -0.1134  -1.2   11.8	Her X-1                       
288.7110  11.0357    6.5  38.4  -91.6   0.5136   1.8    7.5	GRS 1915+105                  
299.7138  35.1949    5.2  18.0 -129.0  -0.2066  -2.2    6.1	Cyg X-1                       
308.2616  40.7852    0.0  18.8 -156.9   0.0778   0.9   12.2	Cyg X-3                       
326.2613  38.1970    5.7  31.7 -170.4  -0.2006  -2.0    8.6	Cyg X-2                       
258.3709  79.6485    2.7  31.7   86.6   0.7505   4.2 ------	UNKNOWN                       
339.9524  73.3200    2.1  33.7  120.5   0.9984   5.6 ------	UNKNOWN                       
329.4897  61.5703    2.2  27.6  141.8   0.5645   5.2 ------	UNKNOWN                       
325.1267  58.7486    0.2  25.2  147.7   5.0543  52.1 ------	UNKNOWN                       
294.7614  23.6089    2.6  26.9 -106.1   0.5201   4.4 ------	UNKNOWN                       
345.3646  15.8777    2.2  59.2 -163.0   2.8389   5.2 ------	UNKNOWN                       
295.5401  19.1554    2.3  31.4 -105.2   0.6776   5.0 ------	UNKNOWN                       
235.8431   6.6854    2.6  58.9  -24.3   2.5055   4.5 ------	UNKNOWN                       
270.8260   7.3526    3.1  43.5  -65.0   1.4038   3.7 ------	UNKNOWN                       
282.8623   8.1908    2.3  41.1  -82.4   1.8224   5.0 ------	UNKNOWN                       

Post-slew image of 15-350 keV band

Time interval of the image:
57.684600 963.074000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
254.6449  35.3596    5.3  50.5  -27.2  -2.7598  -2.2    9.2	Her X-1                       
299.5711  35.2087    0.6  28.9  -75.4  14.2155  18.8    1.0	Cyg X-1                       
308.1232  40.9418    1.5  20.8  -83.7   5.1667   8.0    0.9	Cyg X-3                       
326.1208  38.4087    3.4  20.4 -124.4   2.0054   3.4    5.7	Cyg X-2                       
 20.2762  62.0705    2.7  26.6  117.0   2.9145   4.2 ------	UNKNOWN                       
325.1374  58.7317    0.7   0.0 -117.7   7.9286  16.2 ------	UNKNOWN                       
256.4141  56.9106    2.4  35.0   -4.7   3.4044   4.7 ------	UNKNOWN                       
306.8691  59.1682    2.5   9.4  -21.9   2.3956   4.6 ------	UNKNOWN                       
318.6966  15.7663    3.0  43.3 -113.1   9.6392   3.9 ------	UNKNOWN