GRB100901A

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 16:28:41 EST 2014
             Host Name: batevent1
   Current Working Dir: /local/data/batevent/batevent_reproc/trigger433065
======================================================================

  Trigger: 00433065      Segment: 000

  BAT Trigger Time: 305040856.512   [s; MET]
      Trigger Stop: 305040864.704   [s; MET]
               UTC: 2010-09-01T13:34:10.376100    [includes UTCF correction] 
       Where From?: TDRSS position message

  BAT 
    RA: 27.2446729253292   Dec: 22.7443520105249  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    7.7
     Image Trigger?:     NO
     Rate S/N Ratio:     10.1980390271856  [ if not an image trigger ]
     Image S/N Ratio:    7.7

  Analysis Position:   [ source = BAT ]
    RA: 27.2446729253292   Dec: 22.7443520105249  [deg; J2000]

  Refined Position:   [ source = BAT pre-slew burst ]
    RA: 27.2447   Dec: 22.7443  [deg; J2000]
        { 01h 48m 58.7s , +22d 44' 39.5" }
        +/- 2.36429637896 [arcmin] (estimated 90% radius based on SNR)
    SNR: 8.89846949821
 
 
  Angular difference between the analysis and refined position is 0.003462 arcmin
 
  Partial Coding Fraction: 0.4023438    [ including projection effects ]

  Duration
     T90: 436.655999958515 +/- 21.7875108881231
        Measured from: 0.287999987602234
                   to: 436.943999946117     [s; relative to TRIGTIME]
     T50: 198.155999958515 +/- 192.654618203612
        Measured from: 199.543999969959
                   to: 397.699999928474     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: -1.80800002813339     
                   to: -0.808000028133392     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: -2.4200000166893     
                   to: 458.423999965191     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     0.813924   1.161621   0.893494   0.239063
           0.118239   0.123275   0.111186   0.102030 [error]
 Peak      0.029326   0.034461   0.016573   0.014175
           0.008345   0.008604   0.007799   0.007138 [error]

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

======================================================================
 
 
====== Table of the duration information =============================
 
        Value   tstart    tstop
T100  460.844   -2.420  458.424
T90   436.656    0.288  436.944
T50   198.156  199.544  397.700
Peak    1.000   -1.808   -0.808
 
 
====== 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      -1.402    -0.204      0.204       -           -               -         4.39e-04     -5.18e-05          5.14e-05      50.260   57
CPL     -1.372    -0.724      0.609      996.920    -996.920      -996.920      4.56e-04     -6.70e-05          3.54e-05      50.320   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      -1.840     -0.650     0.577       -           -               -         5.65e-03     -2.05e-03          1.82e-03      56.440   57
CPL     -1.839     -1.568     0.467     9999.340      N/A           N/A         5.65e-03        N/A               N/A         56.440   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   2.36e-07  4.60e-07  6.96e-07  2.29e-06  1.95e-06  3.68e-06   erg/cm2
      90%_error_low -4.57e-08 -5.56e-08 -1.07e-07 -6.75e-07 -2.59e-07 -7.70e-07   erg/cm2
      90%_error_hi   4.76e-08  5.50e-08  1.07e-07  8.54e-07  2.62e-07  9.21e-07   erg/cm2
Peak flux       PL   3.22e-01  2.66e-01  1.48e-01  1.22e-01  7.90e-01  8.58e-01   ph/cm2/s
      90%_error_low -1.42e-01 -7.43e-02 -6.88e-02 -8.40e-02 -2.21e-01 -2.40e-01   ph/cm2/s
      90%_error_hi   1.53e-01  7.37e-02  6.70e-02  1.53e-01  2.21e-01  2.41e-01   ph/cm2/s
 
Fluence        CPL   2.37e-07  4.57e-07  6.96e-07  2.27e-06  1.95e-06  3.70e-06   erg/cm2
      90%_error_low    N/A       N/A       N/A       N/A       N/A    -1.53e-06   erg/cm2
      90%_error_hi     N/A       N/A       N/A       N/A       N/A     4.12e-07   erg/cm2
Peak flux      CPL   2.93e-01  2.02e-01  1.09e-01  9.15e-02  8.04e-01  8.65e-01   ph/cm2/s
      90%_error_low     N/A   -1.16e-01 -6.19e-02 -4.61e-02 -2.31e-01 -2.49e-01   ph/cm2/s
      90%_error_hi      N/A    1.25e-01  3.72e-02  4.65e-02  2.10e-01  2.31e-01   ph/cm2/s
 
======================================================================

Special notes of this burst

Image

Pre-slew 25.0-100.0 keV image (Event data)

#RAcent DECcent POSerr Theta  Phi  Peak_Cts  SNR Name
27.245 22.744 0.000 41.044 165.735 0.318 8.898 TRIG_00433065
 
Image time interval: 0.000 to 8.192 [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

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   -2.420 sec. to  458.424 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.40216     ( -0.204133   0.204463 )
Norm@50keV  : 4.39118E-04    ( -5.17692e-05   5.14189e-05 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          50.26 using 59 PHA bins.
# Reduced chi-squared =         0.8817 for     57 degrees of freedom 
# Null hypothesis probability =   7.240799e-01
 
Photon flux (15-150 keV)    in 460.8 sec: 5.35036E-02 ( -0.0061795  0.0061854 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.95458e-06 ( -2.58706e-07  2.62357e-07 ) ergs/cm2

Cutoff power-law model

Time interval is from   -2.420 sec. to  458.424 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.39937     ( -0.72388   0.60934 )
Epeak [keV] : 1.00000E+04      ( -10000 -10000 )
Norm@50keV  : 4.40667E-04    ( -5.21036e-05   5.02664e-05 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          50.26 using 59 PHA bins.
# Reduced chi-squared =         0.8976 for     56 degrees of freedom 
# Null hypothesis probability =   6.907942e-01
 
Photon flux (15-150 keV)    in 460.8 sec: 5.36158E-02 ( -0.0065386  0.006268 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.9539e-06 ( 0  0 ) ergs/cm2

1-s peak spectrum fit

Power-law model

Time interval is from   -1.808 sec. to   -0.808 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.8402     ( -0.650236   0.576779 )
Norm@50keV  : 5.64543E-03    ( -0.00204903   0.00182125 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          56.44 using 59 PHA bins.
# Reduced chi-squared =         0.9901 for     57 degrees of freedom 
# Null hypothesis probability =   4.961470e-01
 
Photon flux (15-150 keV)    in 1 sec: 0.790444 ( -0.221211  0.220976 ) ph/cm2/s
Energy fluence (15-150 keV)             : 5.19194e-08 ( -1.74003e-08  1.79537e-08 ) ergs/cm2

Cutoff power-law model

Time interval is from   -1.808 sec. to   -0.808 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -3.07133     ( -0.333438   1.70169 )
Epeak [keV] : 317.469      (   )
Norm@50keV  : 1.43987E-03    (     )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          54.97 using 59 PHA bins.
# Reduced chi-squared =         0.9816 for     56 degrees of freedom 
# Null hypothesis probability =   5.137924e-01
 
Photon flux (15-150 keV)    in 1 sec: 0.803740 ( -0.230933  0.21014 ) ph/cm2/s
Energy fluence (15-150 keV)             : 4.27533e-08 ( -2.34407e-08  1.10526e-08 ) ergs/cm2

Time-resolved spectra

Distribution

T90 vs. Hardness ratio plot

T90                                   = 436.656 sec.
Hardness ratio (energy fluence ratio) = 1.51345680698

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

S(15-50 keV)  = 6.956758e-07
S(50-150 keV) = 1.2588964e-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 = -0.843794285758, IMY = -0.214535657933

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:
-239.512000 -2.420000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
 39.8396  33.6801    3.1  54.3  176.9   2.3632   3.7 ------	UNKNOWN                       
 54.4826  32.0424    3.2  58.7 -169.2   3.5980   3.6 ------	UNKNOWN

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

Time interval of the image:
-2.420000 51.388600
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
 27.2549  22.7543    2.2  41.1  165.7   0.6884   5.2 ------	UNKNOWN                       
 27.2924  11.3554    2.1  29.8  168.5   0.4801   5.4 ------	UNKNOWN                       
 24.5745  -3.7907    2.4  14.4  167.2   0.3600   4.9 ------	UNKNOWN                       
 63.0742 -55.6500    2.5  48.4  -50.1   1.5872   4.7 ------	UNKNOWN

Post-slew image of 15-350 keV band

Time interval of the image:
127.588610 625.388600
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
 27.2676  22.7560    1.3   0.1 -167.3   2.6975   9.2 ------	UNKNOWN

Analysis Summary

Notes:

Image

Pre-slew 25.0-100.0 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