GRB110915A: 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 Jan 13 20:53:29 EST 2014
             Host Name: batevent1
   Current Working Dir: /local/data/batevent/batevent_reproc/trigger503219
======================================================================

  Trigger: 00503219      Segment: 000

  BAT Trigger Time: 337785651.776   [s; MET]
      Trigger Stop: 337785652.8   [s; MET]
               UTC: 2011-09-15T13:20:44.408340    [includes UTCF correction] 
       Where From?: TDRSS position message

  BAT 
    RA: 310.850908926637   Dec: -0.709481126574814  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    7.14
     Image Trigger?:     NO
     Rate S/N Ratio:     11.6189500386223  [ if not an image trigger ]
     Image S/N Ratio:    7.14

  Analysis Position:   [ source = BAT ]
    RA: 310.850908926637   Dec: -0.709481126574814  [deg; J2000]

  Refined Position:   [ source = BAT pre-slew burst ]
    RA: 310.82767368423   Dec: -0.716067178725618  [deg; J2000]  
        { 20h 43m 18.6s , -00d 42' 57.8" }
         +/- 1.23753335004595 [arcmin] (estimated 90% radius based on SNR)
         +/- 0.475704527899567 [arcmin] (formal 1-sigma fit error)
    SNR: 22.433354574969
 
  Angular difference between the analysis and refined position is 1.448934 arcmin
 
  Partial Coding Fraction: 0.2578125    [ including projection effects ]

  Duration
     T90: 79.5679998993874 +/- 2.9824151713098
        Measured from: 0.912000000476837
                   to: 80.4799998998642     [s; relative to TRIGTIME]
     T50: 56.9759999513626 +/- 0.896330272847611
        Measured from: 11.7799999713898
                   to: 68.7559999227524     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: 68.039999961853     
                   to: 69.039999961853     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: -4.88400000333786     
                   to: 99.7919999957085     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     2.177093   3.317228   2.828085   0.704281
           0.080239   0.081791   0.073036   0.060619 [error]
 Peak      0.093560   0.138952   0.135382   0.039575
           0.006304   0.006857   0.006393   0.004916 [error]

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

======================================================================
 
 
====== Table of the duration information =============================
 
        Value   tstart    tstop
T100  104.676   -4.884   99.792
T90    79.568    0.912   80.480
T50    56.976   11.780   68.756
Peak    1.000   68.040   69.040
 
 
====== 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: CPL)
 
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      -1.386    -0.053      0.053       -           -               -         5.77e-03     -1.67e-04          1.67e-04      73.060   57
CPL     -0.980    -0.218      0.229      138.238     -30.788        91.763      8.85e-03     -1.77e-03          2.34e-03      62.520   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      -1.196     -0.091     0.092       -           -               -         2.65e-02     -1.34e-03          1.34e-03      52.170   57
CPL     -1.096     -0.144     0.357      492.005    -492.005      -492.005      2.96e-02     -4.11e-03          1.34e-02      51.910   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   6.93e-07  1.37e-06  2.09e-06  6.98e-06  5.85e-06  1.11e-05   erg/cm2
      90%_error_low -3.98e-08 -4.63e-08 -7.30e-08 -5.42e-07 -1.81e-07 -5.83e-07   erg/cm2
      90%_error_hi   4.07e-08  4.62e-08  7.28e-08  5.73e-07  1.81e-07  6.08e-07   erg/cm2
Peak flux       PL   8.16e-01  9.85e-01  8.60e-01  1.29e+00  3.11e+00  3.95e+00   ph/cm2/s
      90%_error_low -8.07e-02 -5.93e-02 -5.10e-02 -1.58e-01 -1.62e-01 -2.12e-01   ph/cm2/s
      90%_error_hi   8.34e-02  5.89e-02  5.07e-02  1.72e-01  1.62e-01  2.14e-01   ph/cm2/s
 
Fluence        CPL   6.28e-07  1.40e-06  2.16e-06  4.15e-06  5.70e-06  8.34e-06   erg/cm2
      90%_error_low -5.07e-08 -5.08e-08 -8.32e-08 -9.36e-07 -2.00e-07 -9.47e-07   erg/cm2
      90%_error_hi   5.17e-08  5.11e-08  8.39e-08  1.28e-06  1.99e-07  1.27e-06   erg/cm2
Peak flux      CPL   7.97e-01  9.91e-01  8.69e-01  1.15e+00  3.10e+00  3.80e+00   ph/cm2/s
      90%_error_low -1.01e-01 -6.27e-02 -2.97e-02 -3.62e-01 -1.70e-01 -4.07e-01   ph/cm2/s
      90%_error_hi   9.02e-02  6.40e-02  5.97e-02  3.28e-01  1.70e-01  2.57e-01   ph/cm2/s
 
======================================================================

Image

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

#   RAcent    DECcent   POSerr    Theta     Phi              Peak Cts       SNR   Name
  310.8277    -0.7161   0.0086    32.9944    81.8430         2.2833218     22.433 TRIG_00503219                 
 
Foreground time interval of the image:
 -4.884  10.925 (delta_t =  15.809 [sec])
Background time interval of the image:
-414.675 -398.746 (delta_t =  15.930 [sec])
-239.776  -4.884 (delta_t = 234.892 [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   -4.884 sec. to   99.792 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.38617     ( -0.0533808   0.0534658 )
Norm@50keV  : 5.76658E-03    ( -0.000167168   0.000167167 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          73.06 using 59 PHA bins.
# Reduced chi-squared =          1.282 for     57 degrees of freedom 
# Null hypothesis probability =   7.446894e-02
 
Photon flux (15-150 keV)    in 104.7 sec: 0.700101 ( -0.021985  0.022037 ) ph/cm2/s
Energy fluence (15-150 keV)             : 5.85136e-06 ( -1.8092e-07  1.81271e-07 ) ergs/cm2
 

Cutoff power-law model

Time interval is from   -4.884 sec. to   99.792 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -0.979583     ( -0.218081   0.229331 )
Epeak [keV] : 138.238      ( -30.7882 91.763 )
Norm@50keV  : 8.84714E-03    ( -0.00177124   0.00234102 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          62.52 using 59 PHA bins.
# Reduced chi-squared =          1.116 for     56 degrees of freedom 
# Null hypothesis probability =   2.559859e-01
 
Photon flux (15-150 keV)    in 104.7 sec: 0.681541 ( -0.023866  0.023933 ) ph/cm2/s
Energy fluence (15-150 keV)             : 5.69898e-06 ( -1.99687e-07  1.99048e-07 ) ergs/cm2
 

1-s peak spectrum fit

Power-law model

Time interval is from   68.040 sec. to   69.040 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.19585     ( -0.0910268   0.0915569 )
Norm@50keV  : 2.65235E-02    ( -0.00133959   0.00133959 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          52.17 using 59 PHA bins.
# Reduced chi-squared =         0.9153 for     57 degrees of freedom 
# Null hypothesis probability =   6.564716e-01
 
Photon flux (15-150 keV)    in 1 sec: 3.11152 ( -0.16204  0.16231 ) ph/cm2/s
Energy fluence (15-150 keV)             : 2.69439e-07 ( -1.52305e-08  1.5302e-08 ) ergs/cm2
 

Cutoff power-law model

Time interval is from   68.040 sec. to   69.040 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.09551     ( -0.14412   0.357283 )
Epeak [keV] : 492.005      ( -492.027 -492.027 )
Norm@50keV  : 2.95567E-02    ( -0.00410517   0.0134031 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          51.91 using 59 PHA bins.
# Reduced chi-squared =         0.9270 for     56 degrees of freedom 
# Null hypothesis probability =   6.302821e-01
 
Photon flux (15-150 keV)    in 1 sec: 3.09636 ( -0.16967  0.1695 ) ph/cm2/s
Energy fluence (15-150 keV)             : 2.6767e-07 ( -1.64351e-08  1.61088e-08 ) ergs/cm2
 

Time-resolved spectra

Distribution

T90 vs. Hardness ratio plot

T90                                   = 79.568 sec.
Hardness ratio (energy fluence ratio) = 1.54425733037

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

S(15-50 keV)  = 2.0276835e-06
S(50-150 keV) = 3.671287e-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 = 9.212154169850038E-02, IMY = -6.426994306230007E-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:
-414.675400 -398.745800
-239.776000 -4.884000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
244.9889 -15.6612    0.5  33.6 -101.0   7.9553  22.3    1.4	Sco X-1                       
254.5877  35.3196   16.5  49.6  -21.7  -0.2960  -0.7    6.5	Her X-1                       
256.0322 -37.8454   16.0  35.5 -144.2   0.1897   0.7    2.2	4U 1700-377                   
256.3969 -36.2965    4.2  34.2 -142.8   0.6652   2.7    7.8	GX 349+2                      
263.0639 -24.8926    6.8  22.0 -135.0   0.3512   1.7    9.3	GX 1+4                        
264.8158 -44.4396    7.7  37.7 -159.5   0.3942   1.5    3.2	4U 1735-44                    
268.2770  -1.5187    3.2  12.6  -51.4   0.6682   3.6    6.8	SW J1753.5-0127               
270.3530 -25.0291    1.9  18.1 -150.8   1.1915   6.2    4.8	GX 5-1                        
270.3231 -25.6406    5.7  18.7 -151.6   0.4207   2.1    6.2	GRS 1758-258                  
274.0869 -13.8825    6.6   6.8 -134.8   0.3211   1.7   10.4	GX 17+2                       
275.8990 -30.2706    7.3  21.7 -169.2   0.3131   1.6    5.9	H1820-303                     
285.0790 -24.9581    7.4  17.3  164.4   0.3415   1.6    3.2	HT1900.1-2455                 
288.7985  10.9412    1.0  22.1   31.4   2.5201  11.6    0.3	GRS 1915+105                  
299.6388  35.1516    5.0  48.2   27.3   1.6365   2.3    3.8	Cyg X-1                       
262.9086 -33.7852    4.9  28.9 -147.9   0.4755   2.4    5.0	GX 354-0                      
318.6070 -36.5411    3.2  45.6  138.0   2.7992   3.6 ------	UNKNOWN                       
283.1147 -43.6548    2.8  35.1  178.6   1.0385   4.2 ------	UNKNOWN                       
273.0358  21.6521    2.8  30.9   -6.1   0.9476   4.2 ------	UNKNOWN                       
236.5852 -48.7102    2.8  53.3 -142.3   4.8006   4.0 ------	UNKNOWN                       

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

Time interval of the image:
-4.884000 10.924610
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
244.9528 -15.7493   42.1  33.7 -101.1   0.0205   0.3    6.7	Sco X-1                       
254.5877  35.3194   14.2  49.6  -21.7   0.0773   0.8    6.5	Her X-1                       
256.1082 -37.7258    4.9  35.4 -144.2   0.1356   2.3    9.1	4U 1700-377                   
256.4168 -36.5638    5.8  34.4 -143.2   0.1112   2.0    8.5	GX 349+2                      
262.9550 -24.8882    7.6  22.0 -134.8  -0.0695  -1.5    9.0	GX 1+4                        
264.9252 -44.6120    0.0  37.8 -159.7   0.1475   2.6   12.5	4U 1735-44                    
268.2131  -1.3152    0.0  12.8  -50.8   0.0451   1.1   12.4	SW J1753.5-0127               
270.2745 -25.2275    4.4  18.3 -150.9   0.1122   2.7    8.9	GX 5-1                        
270.4625 -25.7442    4.1  18.7 -152.1   0.1318   3.1    8.6	GRS 1758-258                  
274.1513 -13.8960   33.3   6.8 -135.3  -0.0147  -0.3   11.9	GX 17+2                       
275.9188 -30.4533    5.9  21.8 -169.4  -0.0861  -2.0    5.2	H1820-303                     
285.1197 -24.8485   44.4  17.2  164.1  -0.0115  -0.3    6.3	HT1900.1-2455                 
288.7347  10.8380    5.3  22.0   31.4  -0.1067  -2.2    7.5	GRS 1915+105                  
299.4768  35.0738    0.0  48.0   27.2   0.4571   2.9    9.5	Cyg X-1                       
262.8407 -33.6835   23.6  28.9 -147.7  -0.0237  -0.5   11.7	GX 354-0                      
313.4288 -10.8628    2.8  34.3  100.7   0.4153   4.2 ------	UNKNOWN                       
310.8277  -0.7161    0.5  33.0   81.8   2.2833  22.4 ------	UNKNOWN                       
235.9632 -46.4358    2.1  52.4 -139.6   1.2068   5.6 ------	UNKNOWN                       
236.5813 -27.2293    2.3  43.8 -116.3   0.9107   5.1 ------	UNKNOWN                       

Post-slew image of 15-350 keV band

Time interval of the image:
65.324620 962.343100
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
270.3033 -25.1124    5.5  46.1 -128.8   3.2340   2.1    2.3	GX 5-1                        
270.1655 -25.5821   82.8  46.4 -129.3  -0.2314  -0.1   12.2	GRS 1758-258                  
274.0909 -14.1855    8.4  38.8 -115.6  -1.4233  -1.4   10.2	GX 17+2                       
276.0317 -30.3227    5.8  44.4 -138.7   1.8734   2.0    6.1	H1820-303                     
285.0902 -25.0028    3.3  34.8 -139.9   1.9416   3.5    5.7	HT1900.1-2455                 
288.8066  10.9551    0.9  24.8  -64.9   6.8805  12.3    0.8	GRS 1915+105                  
299.6237  35.2268    1.9  37.4  -18.7   3.2763   6.0    2.2	Cyg X-1                       
308.0940  40.9568    1.7  41.7   -6.7   4.5830   6.6    0.8	Cyg X-3                       
326.1258  38.4374    4.6  41.6   14.6   1.8646   2.5    7.3	Cyg X-2                       
344.2689  10.2047    3.0  35.0   67.4   4.3312   3.8 ------	UNKNOWN                       
341.1425  35.7567    3.3  46.1   31.1   4.5307   3.5 ------	UNKNOWN                       
313.1320 -18.9295    2.6  18.4  169.5   1.8011   4.4 ------	UNKNOWN                       
310.8196  -0.7528    1.4   0.0 -162.4   3.5420   8.3 ------	UNKNOWN                       
307.8151   8.1086    2.8   9.3  -22.3   1.6485   4.2 ------	UNKNOWN                       
285.1379   0.6280    2.9  25.7  -90.6   2.1925   4.0 ------	UNKNOWN                       
284.3243  46.5150    2.8  52.6  -26.3   4.9201   4.1 ------	UNKNOWN                       
270.7558 -45.2307    3.5  56.8 -150.7   8.6163   3.3 ------	UNKNOWN                       
269.6757  -4.4598    3.5  41.3  -99.5   7.9320   3.3 ------	UNKNOWN