GRB100915A: 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: Fri Jan 17 16:05:00 EST 2014
             Host Name: batevent1
   Current Working Dir: /local/data/batevent/batevent_reproc/trigger434178
======================================================================

  Trigger: 00434178      Segment: 000

  BAT Trigger Time: 306207072   [s; MET]
      Trigger Stop: 306207136   [s; MET]
               UTC: 2010-09-15T01:31:05.822060    [includes UTCF correction] 
       Where From?: TDRSS position message

  BAT 
    RA: 315.648430088771   Dec: 65.6666778587913  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    8.67
     Image Trigger?:     YES
     Rate S/N Ratio:     0  [ if not an image trigger ]
     Image S/N Ratio:    8.67

  Analysis Position:   [ source = BAT ]
    RA: 315.648430088771   Dec: 65.6666778587913  [deg; J2000]

  Refined Position:   [ source = BAT pre-slew burst ]
    RA: 315.668971063575   Dec: 65.6831438613723  [deg; J2000]  
        { 21h 02m 40.6s , +65d 40' 59.3" }
         +/- 1.96083564054061 [arcmin] (estimated 90% radius based on SNR)
         +/- 1.00571384314772 [arcmin] (formal 1-sigma fit error)
    SNR: 11.6237229045367
 
  Angular difference between the analysis and refined position is 1.110761 arcmin
 
  Partial Coding Fraction: 0.546875    [ including projection effects ]

  Duration
     T90: 199.195999920368 +/- 26.1886720109784
        Measured from: -28.2639999985695
                   to: 170.931999921799     [s; relative to TRIGTIME]
     T50: 74.6999999284744 +/- 44.7318905947454
        Measured from: -4.24000000953674
                   to: 70.4599999189377     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: 8.75999999046326     
                   to: 9.75999999046326     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: -36.3040000200272     
                   to: 185.84399998188     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     0.752220   0.829151   0.704758   0.309393
           0.091951   0.094342   0.084187   0.075489 [error]
 Peak      0.024448   0.007320   0.019966   0.014234
           0.006898   0.007078   0.006518   0.005852 [error]

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

======================================================================
 
 
====== Table of the duration information =============================
 
        Value   tstart    tstop
T100  222.148  -36.304  185.844
T90   199.196  -28.264  170.932
T50    74.700   -4.240   70.460
Peak    1.000    8.760    9.760
 
 
====== 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      -1.521    -0.236      0.231       -           -               -         7.13e-04     -8.60e-05          8.44e-05      70.740   57
CPL     -1.545    -2.423     -0.660     9999.360    -9683.318      -9506.040      7.06e-04     -7.06e-04          -4.02e-04      70.820   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      -1.604     -3.207     1.124       -           -               -         3.65e-03     -3.65e-03          1.44e-03      72.020   57
CPL     -1.635      N/A       N/A        9999.310      N/A           N/A         3.63e-03        N/A               N/A         72.030   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   2.06e-07  3.74e-07  5.22e-07  1.52e-06  1.50e-06  2.62e-06   erg/cm2
      90%_error_low -4.23e-08 -4.48e-08 -8.79e-08 -5.01e-07 -2.01e-07 -5.74e-07   erg/cm2
      90%_error_hi   4.47e-08  4.42e-08  8.64e-08  6.52e-07  2.04e-07  6.99e-07   erg/cm2
Peak flux       PL   1.69e-01  1.58e-01  1.02e-01  1.03e-01  4.71e-01  5.32e-01   ph/cm2/s
      90%_error_low -1.69e-01 -7.65e-02 -1.02e-01 -1.03e-01 -1.75e-01 -2.02e-01   ph/cm2/s
      90%_error_hi   1.75e-01  5.82e-02  6.29e-02  3.00e-01  1.71e-01  2.18e-01   ph/cm2/s
 
Fluence        CPL   2.07e-07  1.36e-07  2.83e-07  1.51e-06  1.50e-06  2.57e-06   erg/cm2
      90%_error_low -4.26e-08 -9.08e-08 -6.81e-08    N/A    -2.12e-07 -5.97e-07   erg/cm2
      90%_error_hi   4.45e-08  1.04e-07  5.06e-08    N/A     2.16e-07  7.43e-07   erg/cm2
Peak flux      CPL   1.48e-01  9.93e-02  4.55e-02  3.49e-02  3.08e-01  3.29e-01   ph/cm2/s
      90%_error_low -7.22e-02 -9.93e-02 -4.55e-02 -3.49e-02 -2.30e-01     N/A     ph/cm2/s
      90%_error_hi   1.55e-01  -4.92e-02  -4.00e-02  -3.41e-02  3.07e-02     N/A     ph/cm2/s
 
======================================================================

Image

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

#   RAcent    DECcent   POSerr    Theta     Phi              Peak Cts       SNR   Name
  315.6690    65.6831   0.0166    26.8537  -103.6419         2.0279576     11.624 TRIG_00434178                 
 
Foreground time interval of the image:
-36.304  73.101 (delta_t = 109.405 [sec])
Background time interval of the image:
-693.599 -681.917 (delta_t =  11.682 [sec])
-239.000 -36.304 (delta_t = 202.696 [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  -36.304 sec. to  185.844 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.52129     ( -0.235684   0.231294 )
Norm@50keV  : 7.13491E-04    ( -8.5991e-05   8.44357e-05 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          70.74 using 59 PHA bins.
# Reduced chi-squared =          1.241 for     57 degrees of freedom 
# Null hypothesis probability =   1.042585e-01
 
Photon flux (15-150 keV)    in 222.1 sec: 8.95939E-02 ( -0.0103383  0.0103625 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.49837e-06 ( -2.01044e-07  2.03784e-07 ) ergs/cm2
 

Cutoff power-law model

Time interval is from  -36.304 sec. to  185.844 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -3.48933     ( -0.484835   1.27833 )
Epeak [keV] : 386.211      ( -68.1138 109.165 )
Norm@50keV  : 8.84591E-05    ( -9.00594e-05   0.000214362 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          63.38 using 59 PHA bins.
# Reduced chi-squared =          1.132 for     56 degrees of freedom 
# Null hypothesis probability =   2.322711e-01
 
Photon flux (15-150 keV)    in 222.1 sec: 8.96023E-02 ( -0.0103648  0.0103408 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.49744e-06 ( -2.1168e-07  2.15608e-07 ) ergs/cm2
 

1-s peak spectrum fit

Power-law model

Time interval is from    8.760 sec. to    9.760 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.60372     ( -3.19809   1.13258 )
Norm@50keV  : 3.65410E-03    ( -0.00364167   0.00145217 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          72.02 using 59 PHA bins.
# Reduced chi-squared =          1.264 for     57 degrees of freedom 
# Null hypothesis probability =   8.682196e-02
 
Photon flux (15-150 keV)    in 1 sec: 0.470899 ( -0.174826  0.171228 ) ph/cm2/s
Energy fluence (15-150 keV)             : 3.37746e-08 ( -2.30453e-08  1.77791e-08 ) ergs/cm2
 

Cutoff power-law model

Time interval is from    8.760 sec. to    9.760 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -7.954     (       )
Epeak [keV] : 776.480      (   )
Norm@50keV  : 5.03134E-06    (     )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          62.03 using 59 PHA bins.
# Reduced chi-squared =          1.108 for     56 degrees of freedom 
# Null hypothesis probability =   2.699655e-01
 
Photon flux (15-150 keV)    in 1 sec: 0.308493 ( -0.229983  0.030675 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.81589e-08 ( -1.52729e-08  1.68227e-08 ) ergs/cm2
 

Time-resolved spectra

Distribution

T90 vs. Hardness ratio plot

T90                                   = 199.196 sec.
Hardness ratio (energy fluence ratio) = 1.3934779038

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

S(15-50 keV)  = 5.808475e-07
S(50-150 keV) = 9.175295e-07

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 = -1.194153001834824E-01, IMY = 4.920300537634579E-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:
-693.599400 -681.917100
-239.000000 -36.304000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
299.5873  35.1915    1.6  38.2 -161.9   1.8868   7.3    0.6	Cyg X-1                       
308.1148  40.9531    1.3  29.6 -158.1   1.7408   8.6    0.2	Cyg X-3                       
326.1521  38.3224    6.2  18.2 -179.3   0.3030   1.8    0.9	Cyg X-2                       
 32.6295  32.6342    2.1  35.9   21.6   1.4270   5.5 ------	UNKNOWN                       
305.8865  23.9161    2.3  40.6  178.7   1.3716   5.1 ------	UNKNOWN                       
 35.4359  47.9060    2.9  31.6   -5.3   0.8444   4.1 ------	UNKNOWN                       
288.8653  16.6142    2.8  57.2 -173.7   3.8656   4.1 ------	UNKNOWN                       
 83.7475  70.7134    3.1  49.2  -48.1   3.5968   3.7 ------	UNKNOWN                       
273.9093  50.8527    2.8  47.9 -129.0   3.3432   4.0 ------	UNKNOWN                       

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

Time interval of the image:
-36.304000 73.100590
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
299.4720  35.2752    5.8  38.2 -161.6   0.3551   2.0    7.3	Cyg X-1                       
307.9157  40.8954    7.9  29.8 -158.0   0.2041   1.5    9.5	Cyg X-3                       
326.0283  38.3637    4.2  18.3 -178.9  -0.3358  -2.8    7.2	Cyg X-2                       
281.5361  21.2711    2.6  59.2 -164.1   3.6699   4.5 ------	UNKNOWN                       
315.6690  65.6831    1.0  26.9 -103.6   2.0287  11.6 ------	UNKNOWN                       

Post-slew image of 15-350 keV band

Time interval of the image:
121.300600 500.606000
502.000000 963.100000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
254.6280  35.2154    7.8  46.5 -150.7  -1.5644  -1.5   11.3	Her X-1                       
299.5727  35.1880    1.0  31.9  154.4   7.6683  12.0    1.2	Cyg X-1                       
308.0777  40.9539    1.0  25.1  142.7   5.8427  11.7    1.5	Cyg X-3                       
326.2052  38.3160    4.4  28.0  111.3   1.6890   2.6    1.6	Cyg X-2                       
261.4089  26.7955    2.7  51.3 -162.7   4.8994   4.3 ------	UNKNOWN