GRB130919A: 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: Sat Jan 11 23:11:22 EST 2014
             Host Name: batevent1
   Current Working Dir: /local/data/batevent/batevent_reproc/trigger571271
======================================================================

  Trigger: 00571271      Segment: 000

  BAT Trigger Time: 401281656   [s; MET]
      Trigger Stop: 401281720   [s; MET]
               UTC: 2013-09-19T11:07:24.949420    [includes UTCF correction] 
       Where From?: TDRSS position message

  BAT 
    RA: 207.28832904434   Dec: -10.3555440490979  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    14.9
     Image Trigger?:     YES
     Rate S/N Ratio:     0  [ if not an image trigger ]
     Image S/N Ratio:    14.9

  Analysis Position:   [ source = BAT ]
    RA: 207.28832904434   Dec: -10.3555440490979  [deg; J2000]

  Refined Position:   [ source = BAT pre-slew burst ]
    RA: 207.280583588002   Dec: -10.3541576041001  [deg; J2000]  
        { 13h 49m 07.3s , -10d 21' 15.0" }
         +/- 1.55965233067255 [arcmin] (estimated 90% radius based on SNR)
         +/- 0.604999490326629 [arcmin] (formal 1-sigma fit error)
    SNR: 16.1199756727995
 
  Angular difference between the analysis and refined position is 0.464665 arcmin
 
  Partial Coding Fraction: 0.7734375    [ including projection effects ]

  Duration
     T90: 99.6839999556541 +/- 26.0280581649074
        Measured from: -7.17599999904633
                   to: 92.5079999566078     [s; relative to TRIGTIME]
     T50: 45.2559999227524 +/- 6.26075144841554
        Measured from: 1.88800001144409
                   to: 47.1439999341965     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: -6.34399998188019     
                   to: -5.34399998188019     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: -20.1520000100136     
                   to: 108.068000018597     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     0.597518   0.999203   0.635618   0.121001
           0.067616   0.066135   0.058546   0.052887 [error]
 Peak      0.014789   0.032682   0.017828   0.005848
           0.006227   0.006071   0.005411   0.004811 [error]

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

======================================================================
 
 
====== Table of the duration information =============================
 
        Value   tstart    tstop
T100  128.220  -20.152  108.068
T90    99.684   -7.176   92.508
T50    45.256    1.888   47.144
Peak    1.000   -6.344   -5.344
 
 
====== 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      -1.514    -0.139      0.138       -           -               -         1.24e-03     -1.03e-04          1.02e-04      57.190   57
CPL     -0.392    -0.681      0.814       68.543     -11.948        34.371      4.72e-03     -2.59e-03          7.55e-03      48.520   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      -1.313     -0.422     0.438       -           -               -         4.66e-03     -1.16e-03          1.16e-03      63.830   57
CPL     -0.508     -0.973     4.632       85.589      N/A           N/A         1.27e-02        N/A               N/A         63.440   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  3.75e-07  5.25e-07  1.54e-06  1.51e-06  2.65e-06   erg/cm2
      90%_error_low -2.69e-08 -3.10e-08 -5.66e-08 -3.24e-07 -1.36e-07 -3.75e-07   erg/cm2
      90%_error_hi   2.79e-08  3.09e-08  5.66e-08  3.79e-07  1.38e-07  4.20e-07   erg/cm2
Peak flux       PL   1.60e-01  1.80e-01  1.45e-01  1.94e-01  5.58e-01  6.81e-01   ph/cm2/s
      90%_error_low -6.69e-02 -5.07e-02 -4.35e-02 -9.70e-02 -1.41e-01 -1.73e-01   ph/cm2/s
      90%_error_hi   7.54e-02  4.94e-02  4.29e-02  1.47e-01  1.41e-01  1.79e-01   ph/cm2/s
 
Fluence        CPL   1.73e-07  4.17e-07  5.40e-07  3.69e-07  1.36e-06  1.50e-06   erg/cm2
      90%_error_low -3.31e-08 -4.05e-08 -6.59e-08 -1.94e-07 -1.55e-07 -2.45e-07   erg/cm2
      90%_error_hi   3.38e-08  4.18e-08  6.51e-08  4.36e-07  1.60e-07  4.48e-07   erg/cm2
Peak flux      CPL   1.44e-01  1.98e-01  1.50e-01  7.34e-02  5.39e-01  5.64e-01   ph/cm2/s
      90%_error_low -8.11e-02 -6.39e-02 -3.69e-02 -7.34e-02 -1.58e-01 -1.83e-01   ph/cm2/s
      90%_error_hi   8.54e-02  8.31e-02  4.96e-02  1.55e-01  1.50e-01  2.19e-01   ph/cm2/s
 
======================================================================

Image

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

#   RAcent    DECcent   POSerr    Theta     Phi              Peak Cts       SNR   Name
  207.2806   -10.3542   0.0119    18.8778   -97.5897         2.2520415     16.120 TRIG_00571271                 
 
Foreground time interval of the image:
-11.699 108.068 (delta_t = 119.767 [sec])
Background time interval of the image:

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  -20.152 sec. to  108.068 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.51393     ( -0.139084   0.137736 )
Norm@50keV  : 1.24130E-03    ( -0.000102755   0.000102267 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          57.19 using 59 PHA bins.
# Reduced chi-squared =          1.003 for     57 degrees of freedom 
# Null hypothesis probability =   4.680098e-01
 
Photon flux (15-150 keV)    in 128.2 sec: 0.155554 ( -0.012577  0.012594 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.50647e-06 ( -1.36032e-07  1.37671e-07 ) ergs/cm2
 

Cutoff power-law model

Time interval is from  -20.152 sec. to  108.068 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -0.392274     ( -0.681208   0.814045 )
Epeak [keV] : 68.5429      ( -11.9474 34.3716 )
Norm@50keV  : 4.71599E-03    ( -0.00258556   0.00754538 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          48.52 using 59 PHA bins.
# Reduced chi-squared =         0.8664 for     56 degrees of freedom 
# Null hypothesis probability =   7.509824e-01
 
Photon flux (15-150 keV)    in 128.2 sec: 0.147118 ( -0.01355  0.01353 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.36228e-06 ( -1.54666e-07  1.59908e-07 ) ergs/cm2
 

1-s peak spectrum fit

Power-law model

Time interval is from   -6.344 sec. to   -5.344 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.3132     ( -0.422148   0.438344 )
Norm@50keV  : 4.66254E-03    ( -0.00116195   0.0011587 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          63.83 using 59 PHA bins.
# Reduced chi-squared =          1.120 for     57 degrees of freedom 
# Null hypothesis probability =   2.490832e-01
 
Photon flux (15-150 keV)    in 1 sec: 0.557637 ( -0.140699  0.14126 ) ph/cm2/s
Energy fluence (15-150 keV)             : 4.59335e-08 ( -1.25609e-08  1.28912e-08 ) ergs/cm2
 

Cutoff power-law model

Time interval is from   -6.344 sec. to   -5.344 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -0.50842     ( -0.973328   4.63181 )
Epeak [keV] : 85.5886      (   )
Norm@50keV  : 1.26733E-02    (     )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          63.44 using 59 PHA bins.
# Reduced chi-squared =          1.133 for     56 degrees of freedom 
# Null hypothesis probability =   2.307825e-01
 
Photon flux (15-150 keV)    in 1 sec: 0.539226 ( -0.157798  0.149862 ) ph/cm2/s
Energy fluence (15-150 keV)             : 4.18341e-08 ( -1.69879e-08  1.57881e-08 ) ergs/cm2
 

Time-resolved spectra

Distribution

T90 vs. Hardness ratio plot

T90                                   = 99.684 sec.
Hardness ratio (energy fluence ratio) = 1.29330216091

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

S(15-50 keV)  = 5.899943e-07
S(50-150 keV) = 7.722907e-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 = -4.516322321979809E-02, IMY = 3.389476216050898E-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:
 

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

Time interval of the image:
-11.699410 108.068000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
186.5758 -62.6874    9.4  54.4  179.3   0.6001   1.2    5.4	GX 301-2                      
245.0115 -15.6393    0.4  18.4   71.0   4.1755  29.4    1.9	Sco X-1                       
255.9531 -37.9712    7.4  34.6  114.4   0.4501   1.6    7.8	4U 1700-377                   
256.4014 -36.3115   23.2  34.1  111.5  -0.1453  -0.5    6.9	GX 349+2                      
262.8265 -24.8437    0.0  35.7   89.4   0.5910   1.6   11.6	GX 1+4                        
262.9191 -33.9532    8.0  38.0  104.1  -0.5720  -1.4    7.9	GX 354-0                      
207.2806 -10.3542    0.7  18.9  -97.6   2.2522  16.1 ------	UNKNOWN                       
186.1468  -3.1626    4.6  41.0  -98.0   1.7536   2.5 ------	UNKNOWN                       

Post-slew image of 15-350 keV band

Time interval of the image:
245.500590 963.024700
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
254.5427  35.4163   38.8  30.8  125.3  -0.1917  -0.3    6.1	Her X-1                       
270.0039  64.6450    3.7  34.8   67.3   2.6769   3.2 ------	UNKNOWN                       
249.3149  81.7758    2.2  37.7   37.2   3.8239   5.4 ------	UNKNOWN                       
219.4395  59.2324    3.3  13.8   37.6   1.3775   3.5 ------	UNKNOWN                       
206.0229  34.1020    2.4  13.7 -113.8   2.0069   4.9 ------	UNKNOWN                       
152.3323  58.3089    2.3  39.4  -17.9   2.5641   5.0 ------	UNKNOWN                       
125.3286  47.2132    2.6  58.6  -22.9  13.1775   4.3 ------	UNKNOWN                       
147.4179  36.8007    3.6  50.6  -44.6   7.0849   3.2 ------	UNKNOWN