GRB130925A

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 May 10 03:54:25 EDT 2015
             Host Name: bat1
   Current Working Dir: /local/data/bat1/alien/Swift_3rdBATcatalog/event/batevent_reproc/trigger571830
======================================================================

  Trigger: 00571830      Segment: 000

  BAT Trigger Time: 401775096   [s; MET]
      Trigger Stop: 401775160   [s; MET]
               UTC: 2013-09-25T04:11:24.926960    [includes UTCF correction] 
       Where From?: TDRSS position message

  BAT 
    RA: 41.1834870565618   Dec: -26.1344446281341  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    23.15
     Image Trigger?:     YES
     Rate S/N Ratio:     0  [ if not an image trigger ]
     Image S/N Ratio:    23.15

  Analysis Position:   [ source = BAT ]
    RA: 41.1834870565618   Dec: -26.1344446281341  [deg; J2000]

  Refined Position:   [ source = BAT pre-slew burst ]
    RA: 41.1851660595169   Dec: -26.1463580863318  [deg; J2000]  
        { 02h 44m 44.4s , -26d 08' 46.9" }
         +/- 0.987240952572084 [arcmin] (estimated 90% radius based on SNR)
         +/- 0.291158824595208 [arcmin] (formal 1-sigma fit error)
    SNR: 30.9802765937543
 
  Angular difference between the analysis and refined position is 0.720506 arcmin
 
  Partial Coding Fraction: 0.09960938    [ including projection effects ]

  Duration
     T90: 160.29599994421 +/- 3.39040768844924
        Measured from: -48.8920000195503
                   to: 111.40399992466     [s; relative to TRIGTIME]
     T50: 83.3959999084473 +/- 2.23230823015722
        Measured from: -28.5799999833107
                   to: 54.8159999251366     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: -35.6359999775887     
                   to: -34.6359999775887     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: -59.0320000052452     
                   to: 903.952000021935     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total    25.746554  27.571896  15.137053   2.878093
           0.281395   0.292809   0.246229   0.193475 [error]
 Peak      0.261260   0.274742   0.212050   0.056038
           0.021574   0.022620   0.019639   0.013822 [error]

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

======================================================================
 
 
====== Table of the duration information =============================
 
        Value   tstart    tstop
T100  962.984  -59.032  903.952
T90   160.296  -48.892  111.404
T50    83.396  -28.580   54.816
Peak    1.000  -35.636  -34.636
 
 
====== 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      -2.053    -0.038      0.038       -           -               -         4.52e-03     -8.48e-05          8.48e-05      43.930   57
CPL     -1.847    -0.152      0.157       39.703     -35.075        10.557      5.63e-03     -8.18e-04          9.95e-04      38.500   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      -1.909     -0.158     0.152       -           -               -         5.09e-02     -4.86e-03          4.78e-03      49.970   57
CPL     -1.766     -0.529     0.594       80.605      N/A           N/A         6.03e-02        N/A               N/A         49.770   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   9.38e-06  1.23e-05  1.19e-05  2.04e-05  4.03e-05  5.40e-05   erg/cm2
      90%_error_low -3.56e-07 -2.64e-07 -2.89e-07 -1.11e-06 -7.48e-07 -1.28e-06   erg/cm2
      90%_error_hi   3.62e-07  2.63e-07  2.89e-07  1.16e-06  7.48e-07  1.30e-06   erg/cm2
Peak flux       PL   3.11e+00  2.46e+00  1.31e+00  1.01e+00  7.33e+00  7.89e+00   ph/cm2/s
      90%_error_low -4.11e-01 -2.10e-01 -1.63e-01 -2.31e-01 -6.35e-01 -6.61e-01   ph/cm2/s
      90%_error_hi   4.27e-01  2.09e-01  1.62e-01  2.66e-01  6.37e-01  6.61e-01   ph/cm2/s
 
Fluence        CPL    N/A      N/A      N/A      N/A      N/A      N/A      erg/cm2
      90%_error_low -3.56e-07 -2.64e-07 -2.89e-07 -1.11e-06 -7.48e-07 -1.28e-06   erg/cm2
      90%_error_hi   3.62e-07  2.63e-07  2.89e-07  1.16e-06  7.48e-07  1.30e-06   erg/cm2
Peak flux      CPL   3.03e+00  2.49e+00  1.33e+00  8.61e-01  7.29e+00  7.71e+00   ph/cm2/s
      90%_error_low -4.96e-01 -2.37e-01 -2.39e-01 -4.03e-01 -6.60e-01 -8.23e-01   ph/cm2/s
      90%_error_hi   5.00e-01  2.51e-01  1.79e-01  2.18e-01  6.60e-01  8.50e-01   ph/cm2/s
 
======================================================================

Special notes of this burst

Image

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

#   RAcent    DECcent   POSerr    Theta     Phi              Peak Cts       SNR   Name
   41.1852   -26.1464   0.0062    40.7866   123.1865        24.7388090     30.980 TRIG_00571830                 
 
Foreground time interval of the image:
-13.299  72.701 (delta_t =  86.000 [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

Bokeh Plot

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  -59.032 sec. to  903.952 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -2.05332     ( -0.0380728   0.0379478 )
Norm@50keV  : 4.52397E-03    ( -8.47953e-05   8.47627e-05 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          43.93 using 59 PHA bins.
# Reduced chi-squared =         0.7708 for     57 degrees of freedom 
# Null hypothesis probability =   8.976539e-01
 
Photon flux (15-150 keV)    in 963 sec: 0.695832 ( -0.016775  0.016895 ) ph/cm2/s
Energy fluence (15-150 keV)             : 4.03215e-05 ( -7.47818e-07  7.4772e-07 ) ergs/cm2

Cutoff power-law model

Time interval is from  -59.032 sec. to  903.952 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.84657     ( -0.151857   0.157038 )
Epeak [keV] : 39.7030      ( -35.0752 10.5571 )
Norm@50keV  : 5.63430E-03    ( -0.000817796   0.000995475 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          38.50 using 59 PHA bins.
# Reduced chi-squared =         0.6875 for     56 degrees of freedom 
# Null hypothesis probability =   9.642015e-01
 
Photon flux (15-150 keV)    in 963 sec: 0.679406 ( -0.020165  0.020384 ) ph/cm2/s
Energy fluence (15-150 keV)             : 0 ( 0  0 ) ergs/cm2

1-s peak spectrum fit

Power-law model

Time interval is from  -35.636 sec. to  -34.636 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.90913     ( -0.158267   0.152048 )
Norm@50keV  : 5.09016E-02    ( -0.00486028   0.00477799 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          49.97 using 59 PHA bins.
# Reduced chi-squared =         0.8766 for     57 degrees of freedom 
# Null hypothesis probability =   7.339862e-01
 
Photon flux (15-150 keV)    in 1 sec: 7.33383 ( -0.63536  0.637 ) ph/cm2/s
Energy fluence (15-150 keV)             : 4.68091e-07 ( -4.36376e-08  4.39798e-08 ) ergs/cm2

Cutoff power-law model

Time interval is from  -35.636 sec. to  -34.636 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.76648     ( -0.529418   0.593997 )
Epeak [keV] : 80.6051      (   )
Norm@50keV  : 6.03154E-02    (     )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          49.77 using 59 PHA bins.
# Reduced chi-squared =         0.8887 for     56 degrees of freedom 
# Null hypothesis probability =   7.084519e-01
 
Photon flux (15-150 keV)    in 1 sec: 7.28626 ( -0.66031  0.66007 ) ph/cm2/s
Energy fluence (15-150 keV)             : 0 ( 0  0 ) ergs/cm2

Time-resolved spectra

Distribution

T90 vs. Hardness ratio plot

T90                                   = N/A sec.
Hardness ratio (energy fluence ratio) = N/A

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

S(15-50 keV)  = N/A
S(50-150 keV) = N/A

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 = -4.722510683243020E-01, IMY = -7.220460645994012E-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:
-13.299400 72.700600
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
 41.1852 -26.1464    0.4  40.8  123.2  24.7382  31.0 ------	UNKNOWN                       
317.0833 -57.7250    2.3  39.9   10.9   1.0885   4.9 ------	UNKNOWN                       
 98.8426 -63.7567    2.7  20.4 -120.1   0.4426   4.3 ------	UNKNOWN                       
230.9158 -62.7054    2.9  50.7  -44.5   2.2333   4.0 ------	UNKNOWN                       
146.6582 -58.1969    2.7  41.1  -98.1   2.5133   4.3 ------	UNKNOWN                       
124.9709 -40.2923    2.6  48.0 -129.1   2.1125   4.5 ------	UNKNOWN

Post-slew image of 15-350 keV band

Time interval of the image:
136.100600 963.032900
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
 41.1782 -26.1471    0.3   0.0   98.6  16.0190  37.1 ------	UNKNOWN                       
 57.6093   1.8315    2.4  32.2 -177.2   2.1914   4.7 ------	UNKNOWN                       
 15.7950 -56.0738    3.3  35.1   -4.6   1.8538   3.5 ------	UNKNOWN

Analysis Summary

Notes:

Image

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

Light Curves

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:

Time averaged spectrum fit using the average DRM

Power-law model

Cutoff power-law model

1-s peak spectrum fit

Power-law model

Cutoff power-law model

Time-resolved spectra

Distribution

T90 vs. Hardness ratio plot

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

Mask shadow pattern

Spacecraft aspect plot

Bright source in the pre-burst/pre-slew/post-slew images

Pre-burst image of 15-350 keV band

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

Post-slew image of 15-350 keV band

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