GRB120521B: 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 04:19:27 EST 2014
             Host Name: batevent1
   Current Working Dir: /local/data/batevent/batevent_reproc/trigger522586
======================================================================

  Trigger: 00522586      Segment: 000

  BAT Trigger Time: 359284077.056   [s; MET]
      Trigger Stop: 359284089.216   [s; MET]
               UTC: 2012-05-21T09:07:48.825220    [includes UTCF correction] 
       Where From?: TDRSS position message

  BAT 
    RA: 197.013854919207   Dec: -52.7460338744419  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    8.56
     Image Trigger?:     NO
     Rate S/N Ratio:     11.6189500386223  [ if not an image trigger ]
     Image S/N Ratio:    8.56

  Analysis Position:   [ source = BAT ]
    RA: 197.013854919207   Dec: -52.7460338744419  [deg; J2000]

  Refined Position:   [ source = BAT pre-slew burst ]
    RA: 197.011807975404   Dec: -52.7571518194873  [deg; J2000]  
        { 13h 08m 02.8s , -52d 45' 25.7" }
         +/- 1.53862798496557 [arcmin] (estimated 90% radius based on SNR)
         +/- 0.62430711440556 [arcmin] (formal 1-sigma fit error)
    SNR: 16.4355645656268
 
  Angular difference between the analysis and refined position is 0.671206 arcmin
 
  Partial Coding Fraction: 0.3554688    [ including projection effects ]

  Duration
     T90: 146.832000017166 +/- 27.9444855556604
        Measured from: 3.39200001955032
                   to: 150.224000036716     [s; relative to TRIGTIME]
     T50: 55.4560000300407 +/- 24.1445897684261
        Measured from: 13.1520000100136
                   to: 68.6080000400543     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: 31.1079999804497     
                   to: 32.1079999804497     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: 0.351999998092651     
                   to: 170.047999978065     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     0.611510   1.010987   1.133812   0.204257
           0.098204   0.101188   0.091531   0.086529 [error]
 Peak      0.030295   0.032908   0.034559   0.008835
           0.009379   0.010008   0.008791   0.008029 [error]

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

======================================================================
 
 
====== Table of the duration information =============================
 
        Value   tstart    tstop
T100  169.696    0.352  170.048
T90   146.832    3.392  150.224
T50    55.456   13.152   68.608
Peak    1.000   31.108   32.108
 
 
====== 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      -1.210    -0.165      0.167       -           -               -         1.21e-03     -1.16e-04          1.16e-04      62.870   57
CPL     -0.229    -0.728      0.892       99.003     -23.599       116.722      3.41e-03     -1.80e-03          4.87e-03      57.260   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      -1.750     -0.529     0.473       -           -               -         6.42e-03     -2.08e-03          1.97e-03      62.250   57
CPL     -1.371     -0.899     2.218       76.106     -76.106       -76.106      1.03e-02     -1.03e-02          1.69e-01      62.090   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   1.99e-07  4.38e-07  7.57e-07  3.04e-06  2.07e-06  4.43e-06   erg/cm2
      90%_error_low -3.52e-08 -4.83e-08 -8.70e-08 -7.04e-07 -2.20e-07 -7.69e-07   erg/cm2
      90%_error_hi   3.72e-08  4.78e-08  8.64e-08  8.41e-07  2.22e-07  8.84e-07   erg/cm2
Peak flux       PL   3.36e-01  2.92e-01  1.73e-01  1.55e-01  8.68e-01  9.56e-01   ph/cm2/s
      90%_error_low -1.29e-01 -7.85e-02 -7.07e-02 -9.56e-02 -2.33e-01 -2.62e-01   ph/cm2/s
      90%_error_hi   1.40e-01  7.84e-02  7.12e-02  1.57e-01  2.33e-01  2.66e-01   ph/cm2/s
 
Fluence        CPL   1.59e-07  4.68e-07  8.20e-07  1.01e-06  1.95e-06  2.45e-06   erg/cm2
      90%_error_low -4.50e-08 -5.60e-08 -1.02e-07 -4.98e-07 -2.37e-07 -5.45e-07   erg/cm2
      90%_error_hi   4.68e-08  5.71e-08  1.05e-07  1.17e-06  2.39e-07  1.17e-06   erg/cm2
Peak flux      CPL   3.20e-01  3.05e-01  1.77e-01  9.60e-02  8.57e-01  8.98e-01   ph/cm2/s
      90%_error_low -1.50e-01 -2.06e-01     N/A   -9.60e-02 -2.33e-01 -2.66e-01   ph/cm2/s
      90%_error_hi   1.52e-01  1.03e-01     N/A    1.17e-01  2.37e-01  3.12e-01   ph/cm2/s
 
======================================================================

Image

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

#   RAcent    DECcent   POSerr    Theta     Phi              Peak Cts       SNR   Name
  197.0118   -52.7572   0.0117    29.9717   102.0933         2.4844132     16.436 TRIG_00522586                 
 
Foreground time interval of the image:
  0.352  57.645 (delta_t =  57.293 [sec])
Background time interval of the image:
-239.056 -40.898 (delta_t = 198.158 [sec])
-40.056   0.352 (delta_t =  40.408 [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    0.352 sec. to  170.048 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.20984     ( -0.164698   0.166819 )
Norm@50keV  : 1.20715E-03    ( -0.000116202   0.000116202 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          62.87 using 59 PHA bins.
# Reduced chi-squared =          1.103 for     57 degrees of freedom 
# Null hypothesis probability =   2.762008e-01
 
Photon flux (15-150 keV)    in 169.7 sec: 0.141895 ( -0.014071  0.014105 ) ph/cm2/s
Energy fluence (15-150 keV)             : 2.07282e-06 ( -2.1979e-07  2.21543e-07 ) ergs/cm2
 

Cutoff power-law model

Time interval is from    0.352 sec. to  170.048 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -0.228551     ( -0.728011   0.892295 )
Epeak [keV] : 99.0032      ( -23.5985 116.722 )
Norm@50keV  : 3.40927E-03    ( -0.00179738   0.00487008 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          57.26 using 59 PHA bins.
# Reduced chi-squared =          1.023 for     56 degrees of freedom 
# Null hypothesis probability =   4.280169e-01
 
Photon flux (15-150 keV)    in 169.7 sec: 0.135104 ( -0.015091  0.015011 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.95323e-06 ( -2.37134e-07  2.39382e-07 ) ergs/cm2
 

1-s peak spectrum fit

Power-law model

Time interval is from   31.108 sec. to   32.108 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.74996     ( -0.528982   0.473194 )
Norm@50keV  : 6.41770E-03    ( -0.00207966   0.00196657 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          62.25 using 59 PHA bins.
# Reduced chi-squared =          1.092 for     57 degrees of freedom 
# Null hypothesis probability =   2.948783e-01
 
Photon flux (15-150 keV)    in 1 sec: 0.867809 ( -0.23307  0.233131 ) ph/cm2/s
Energy fluence (15-150 keV)             : 5.92284e-08 ( -1.89214e-08  1.9763e-08 ) ergs/cm2
 

Cutoff power-law model

Time interval is from   31.108 sec. to   32.108 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.3712     ( -0.89911   2.21798 )
Epeak [keV] : 76.1064      ( -76.1003 -76.1003 )
Norm@50keV  : 1.03385E-02    ( -0.0103393   0.168526 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          62.09 using 59 PHA bins.
# Reduced chi-squared =          1.109 for     56 degrees of freedom 
# Null hypothesis probability =   2.681121e-01
 
Photon flux (15-150 keV)    in 1 sec: 0.857348 ( -0.233197  0.237212 ) ph/cm2/s
Energy fluence (15-150 keV)             : 5.74315e-08 ( -1.97785e-08  2.05713e-08 ) ergs/cm2
 

Time-resolved spectra

Distribution

T90 vs. Hardness ratio plot

T90                                   = 146.832 sec.
Hardness ratio (energy fluence ratio) = 1.72929878055

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

S(15-50 keV)  = 6.37376e-07
S(50-150 keV) = 1.4354507e-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 = -1.208197273612199E-01, IMY = -5.638948055288383E-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:
-239.056000 -40.898100
-40.056000 0.352000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
135.4856 -40.5748    1.8  12.8  -64.6   1.1711   6.3    2.3	Vela X-1                      
170.1664 -60.7077    4.5  16.6  128.0   0.5115   2.5    6.7	Cen X-3                       
186.5835 -62.8612    2.5  24.5  124.4   1.1720   4.6    5.8	GX 301-2                      
203.4249 -57.4811    2.7  32.6  112.4   1.5174   4.3 ------	UNKNOWN                       
136.8135 -31.2425    2.7  20.2  -43.7   0.8320   4.2 ------	UNKNOWN                       
 26.4435 -62.6748    3.8  59.0 -166.2   4.3395   3.1 ------	UNKNOWN                       
 36.8511 -60.3491    3.7  57.3 -160.1   3.5990   3.2 ------	UNKNOWN                       
 35.8622 -58.8589    3.7  58.7 -159.2   4.9201   3.1 ------	UNKNOWN                       
 39.6625 -57.9229    3.5  58.0 -156.8   4.1682   3.3 ------	UNKNOWN                       

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

Time interval of the image:
0.352000 57.644600
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
135.6515 -40.7172    6.3  12.6  -64.7   0.1719   1.8   11.2	Vela X-1                      
170.1979 -60.4820    4.9  16.5  127.3   0.2397   2.3    9.1	Cen X-3                       
186.6052 -62.6282    9.2  24.5  123.9   0.1547   1.3    8.6	GX 301-2                      
197.0118 -52.7572    0.7  30.0  102.1   2.4849  16.4 ------	UNKNOWN                       

Post-slew image of 15-350 keV band

Time interval of the image:
108.244600 963.052500
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
135.6678 -40.4704    4.5  42.5  -69.3   7.2721   2.5    8.1	Vela X-1                      
170.4125 -60.6311    2.2  16.4  -99.7   2.9930   5.3    2.9	Cen X-3                       
186.6684 -62.7638    0.9  11.4 -126.1   5.9608  12.4    0.5	GX 301-2                      
255.8640 -37.9534    7.3  42.6  123.5   3.3544   1.6    8.8	4U 1700-377                   
264.7693 -44.4509  105.9  43.9  137.0   0.2079   0.1    1.1	4U 1735-44                    
248.5286 -47.4094    0.9  32.8  131.2  12.1080  13.3 ------	UNKNOWN                       
 31.0873 -71.5808    9.0  55.3 -145.2   6.0200   1.3 ------	UNKNOWN