GRB120422A

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 04:39:17 EST 2014
             Host Name: batevent1
   Current Working Dir: /local/data/batevent/batevent_reproc/trigger520658
======================================================================

  Trigger: 00520658      Segment: 000

  BAT Trigger Time: 356771531.776   [s; MET]
      Trigger Stop: 356771535.872   [s; MET]
               UTC: 2012-04-22T07:12:03.648220    [includes UTCF correction] 
       Where From?: TDRSS position message

  BAT 
    RA: 136.929034138057   Dec: 14.0064324830064  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    8.33
     Image Trigger?:     NO
     Rate S/N Ratio:     11.8321595661992  [ if not an image trigger ]
     Image S/N Ratio:    8.33

  Analysis Position:   [ source = BAT ]
    RA: 136.929034138057   Dec: 14.0064324830064  [deg; J2000]

  Refined Position:   [ source = BAT pre-slew burst ]
    RA: 136.929   Dec: 14.0064  [deg; J2000]
        { 09h 07m 43.0s , +14d 00' 23.0" }
        +/- 2.14850083649 [arcmin] (estimated 90% radius based on SNR)
    SNR: 10.2022479276
 
 
  Angular difference between the analysis and refined position is 0.002784 arcmin
 
  Partial Coding Fraction: 0.6875    [ including projection effects ]

  Duration
     T90: 60.3520000576973 +/- 5.72791058369858
        Measured from: 1.18399995565414
                   to: 61.5360000133514     [s; relative to TRIGTIME]
     T50: 49.6000000238419 +/- 36.9015364662264
        Measured from: 3.74399995803833
                   to: 53.3439999818802     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: 0.843999981880188     
                   to: 1.84399998188019     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: 0.863999962806702     
                   to: 63.2639999985695     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     0.227268   0.221272   0.138424   0.060864
           0.046741   0.048558   0.043185   0.038802 [error]
 Peak      0.017411   0.023975   0.026005   0.007563
           0.006433   0.006483   0.006161   0.005544 [error]

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

======================================================================
 
 
====== Table of the duration information =============================
 
        Value   tstart    tstop
T100   62.400    0.864   63.264
T90    60.352    1.184   61.536
T50    49.600    3.744   53.344
Peak    1.000    0.844    1.844
 
 
====== 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      -1.986    -0.475      0.416       -           -               -         5.61e-04     -1.75e-04          1.66e-04      50.360   57
CPL     -2.243    -0.116      2.444       97.009      N/A           N/A         4.06e-04        N/A               N/A         50.300   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      -1.002     -0.471     0.509       -           -               -         4.97e-03     -1.30e-03          1.28e-03      58.220   57
CPL     -0.867      0.867     2.398      481.676    -481.676      -481.676      5.70e-03        N/A               N/A         58.200   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   7.07e-08  9.67e-08  9.76e-08  1.79e-07  3.22e-07  4.44e-07   erg/cm2
      90%_error_low -2.03e-08 -2.21e-08 -3.93e-08 -1.09e-07 -9.02e-08 -1.64e-07   erg/cm2
      90%_error_hi   2.08e-08  2.16e-08  4.23e-08  1.91e-07  9.61e-08  2.31e-07   erg/cm2
Peak flux       PL   1.27e-01  1.72e-01  1.72e-01  3.10e-01  5.72e-01  7.82e-01   ph/cm2/s
      90%_error_low -6.28e-02 -5.79e-02 -4.93e-02 -1.59e-01 -1.51e-01 -2.15e-01   ph/cm2/s
      90%_error_hi   7.67e-02  5.56e-02  4.80e-02  2.50e-01  1.52e-01  2.40e-01   ph/cm2/s
 
Fluence        CPL   6.90e-08  9.56e-08  8.37e-08  1.99e-07  3.01e-07  4.58e-07   erg/cm2
      90%_error_low -2.45e-08 -6.28e-08 -3.30e-08 -1.96e-07 -1.87e-07 -1.74e-07   erg/cm2
      90%_error_hi   2.23e-08  2.34e-08  3.67e-08  6.49e-08  9.89e-08  1.33e-07   erg/cm2
Peak flux      CPL   1.23e-01  1.73e-01  1.75e-01  2.68e-01  5.68e-01  7.39e-01   ph/cm2/s
      90%_error_low -8.03e-02 -5.89e-02 -5.15e-02 -2.68e-01 -1.59e-01 -3.00e-01   ph/cm2/s
      90%_error_hi   8.01e-02  6.08e-02  6.09e-02  1.72e-01  1.55e-01  2.73e-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
136.929 14.006 0.000 23.543 -110.991 0.177 10.202 TRIG_00520658
 
Image time interval: 0.000 to 4.096 [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    0.864 sec. to   63.264 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.98649     ( -0.474842   0.416196 )
Norm@50keV  : 5.60596E-04    ( -0.00017508   0.000165992 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          50.36 using 59 PHA bins.
# Reduced chi-squared =         0.8836 for     57 degrees of freedom 
# Null hypothesis probability =   7.205352e-01
 
Photon flux (15-150 keV)    in 62.4 sec: 8.35774E-02 ( -0.0181224  0.0181286 ) ph/cm2/s
Energy fluence (15-150 keV)             : 3.2243e-07 ( -9.01692e-08  9.61272e-08 ) ergs/cm2

Cutoff power-law model

Time interval is from    0.864 sec. to   63.264 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -2.24313     ( -0.116347   2.44409 )
Epeak [keV] : 97.0093      (   )
Norm@50keV  : 4.06243E-04    (     )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          50.30 using 59 PHA bins.
# Reduced chi-squared =         0.8982 for     56 degrees of freedom 
# Null hypothesis probability =   6.896278e-01
 
Photon flux (15-150 keV)    in 62.4 sec: 7.62196E-02 ( -0.0281952  0.0255684 ) ph/cm2/s
Energy fluence (15-150 keV)             : 3.0104e-07 ( -1.87454e-07  9.8909e-08 ) ergs/cm2

1-s peak spectrum fit

Power-law model

Time interval is from    0.844 sec. to    1.844 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.00229     ( -0.471181   0.508608 )
Norm@50keV  : 4.96750E-03    ( -0.00129734   0.00128291 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          58.22 using 59 PHA bins.
# Reduced chi-squared =          1.021 for     57 degrees of freedom 
# Null hypothesis probability =   4.302537e-01
 
Photon flux (15-150 keV)    in 1 sec: 0.571971 ( -0.150646  0.151675 ) ph/cm2/s
Energy fluence (15-150 keV)             : 5.36785e-08 ( -1.50516e-08  1.53502e-08 ) ergs/cm2

Cutoff power-law model

Time interval is from    0.844 sec. to    1.844 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -0.86663     ( 0.86663   2.39793 )
Epeak [keV] : 481.676      ( -481.675 -481.675 )
Norm@50keV  : 5.70315E-03    (     )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          58.20 using 59 PHA bins.
# Reduced chi-squared =          1.039 for     56 degrees of freedom 
# Null hypothesis probability =   3.943064e-01
 
Photon flux (15-150 keV)    in 1 sec: 0.568139 ( -0.15919  0.154767 ) ph/cm2/s
Energy fluence (15-150 keV)             : 5.32709e-08 ( -1.63017e-08  1.56419e-08 ) ergs/cm2

Time-resolved spectra

Distribution

T90 vs. Hardness ratio plot

T90                                   = 60.352 sec.
Hardness ratio (energy fluence ratio) = 1.0094390603

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

S(15-50 keV)  = 1.673422e-07
S(50-150 keV) = 1.5508798e-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 = -0.156082287016, IMY = 0.406797878943

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:
-239.776000 0.864000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
204.1511  14.9349    2.5  42.1   51.2   2.7104   4.6 ------	UNKNOWN                       
118.0222 -30.3914    3.7  58.9 -166.0   3.9058   3.1 ------	UNKNOWN                       
126.7742   6.6039    2.8  34.1 -124.8   1.1414   4.1 ------	UNKNOWN

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

Time interval of the image:
0.864000 38.124600
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
136.9113  14.0138    1.7  23.6 -111.0   0.5267   6.8 ------	UNKNOWN

Post-slew image of 15-350 keV band

Time interval of the image:
84.324590 962.238300
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
135.3829 -40.5700   21.7  54.6  165.3   1.4476   0.5    6.7	Vela X-1                      
176.0434  61.7297    2.4  55.2    5.1   9.6069   4.8 ------	UNKNOWN                       
142.5127  39.7415    2.8  26.2   -6.5   1.9477   4.1 ------	UNKNOWN                       
112.4325  55.4360    3.2  45.6  -35.5   3.6084   3.7 ------	UNKNOWN                       
 93.6995 -21.3549    4.1  55.3 -145.3  11.2192   2.9 ------	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