GRB130315A: 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: Sun Jan 12 04:58:30 EST 2014
             Host Name: batevent1
   Current Working Dir: /local/data/batevent/batevent_reproc/trigger551126
======================================================================

  Trigger: 00551126      Segment: 000

  BAT Trigger Time: 385044343.296   [s; MET]
      Trigger Stop: 385044355.456   [s; MET]
               UTC: 2013-03-15T12:45:32.970220    [includes UTCF correction] 
       Where From?: TDRSS position message

  BAT 
    RA: 157.542476803624   Dec: -51.8102228367283  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    8.07
     Image Trigger?:     NO
     Rate S/N Ratio:     10.6301458127346  [ if not an image trigger ]
     Image S/N Ratio:    8.07

  Analysis Position:   [ source = BAT ]
    RA: 157.542476803624   Dec: -51.8102228367283  [deg; J2000]

  Refined Position:   [ source = BAT pre-slew burst ]
    RA: 157.54192132379   Dec: -51.7952974134817  [deg; J2000]  
        { 10h 30m 10.1s , -51d 47' 43.1" }
         +/- 1.33822522045647 [arcmin] (estimated 90% radius based on SNR)
         +/- 0.511332951102274 [arcmin] (formal 1-sigma fit error)
    SNR: 20.0614520961373
 
  Angular difference between the analysis and refined position is 0.895763 arcmin
 
  Partial Coding Fraction: 0.421875    [ including projection effects ]

  Duration
     T90: 230.507999956608 +/- 17.9689910938007
        Measured from: 7.63599997758865
                   to: 238.143999934196     [s; relative to TRIGTIME]
     T50: 138.939999938011 +/- 9.95173307156065
        Measured from: 34.3280000090599
                   to: 173.267999947071     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: 8.40799999237061     
                   to: 9.40799999237061     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: 1.6240000128746     
                   to: 267.995999991894     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     2.374187   2.916598   2.038402   0.405682
           0.111176   0.113993   0.098584   0.081744 [error]
 Peak      0.011009   0.044977   0.055766   0.007795
           0.009266   0.010166   0.009385   0.007232 [error]

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

======================================================================
 
 
====== Table of the duration information =============================
 
        Value   tstart    tstop
T100  266.372    1.624  267.996
T90   230.508    7.636  238.144
T50   138.940   34.328  173.268
Peak    1.000    8.408    9.408
 
 
====== 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      -1.725    -0.084      0.083       -           -               -         1.84e-03     -8.86e-05          8.82e-05      70.960   57
CPL     -1.342    -0.334      0.363       83.564     -19.887       191.004      2.89e-03     -9.23e-04          1.51e-03      67.090   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      -1.072     -0.362     0.396       -           -               -         8.38e-03     -2.08e-03          2.05e-03      64.440   57
CPL      0.487     -1.667     2.799       92.322     -28.125       -92.322      4.07e-02     -4.07e-02          4.74e-01      62.030   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   7.73e-07  1.24e-06  1.50e-06  3.55e-06  4.53e-06  7.06e-06   erg/cm2
      90%_error_low -5.97e-08 -5.87e-08 -9.61e-08 -4.63e-07 -2.27e-07 -5.44e-07   erg/cm2
      90%_error_hi   6.12e-08  5.86e-08  9.61e-08  5.08e-07  2.28e-07  5.78e-07   erg/cm2
Peak flux       PL   2.29e-01  2.98e-01  2.83e-01  4.78e-01  9.69e-01  1.29e+00   ph/cm2/s
      90%_error_low -1.00e-01 -9.22e-02 -6.89e-02 -1.97e-01 -2.46e-01 -3.06e-01   ph/cm2/s
      90%_error_hi   1.19e-01  9.10e-02  6.85e-02  2.65e-01  2.50e-01  3.11e-01   ph/cm2/s
 
Fluence        CPL   7.25e-07  1.28e-06  1.52e-06  2.01e-06  4.39e-06  5.54e-06   erg/cm2
      90%_error_low -7.21e-08 -7.09e-08 -1.02e-07 -7.37e-07 -2.58e-07 -7.81e-07   erg/cm2
      90%_error_hi   7.31e-08  7.21e-08  1.03e-07  1.27e-06  2.58e-07  1.28e-06   erg/cm2
Peak flux      CPL   1.51e-01  3.21e-01  3.40e-01  1.65e-01  9.28e-01  9.78e-01   ph/cm2/s
      90%_error_low -1.07e-01 -1.12e-01 -9.26e-02 -1.65e-01 -2.48e-01 -2.83e-01   ph/cm2/s
      90%_error_hi   1.41e-01  1.11e-01  9.80e-02  3.91e-01  2.54e-01  4.15e-01   ph/cm2/s
 
======================================================================

Image

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

#   RAcent    DECcent   POSerr    Theta     Phi              Peak Cts       SNR   Name
  157.5419   -51.7953   0.0096    43.9895    -0.5539         3.0014198     20.061 TRIG_00551126                 
 
Foreground time interval of the image:
  1.624  60.805 (delta_t =  59.181 [sec])
Background time interval of the image:
-239.296   1.624 (delta_t = 240.920 [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    1.624 sec. to  267.996 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.72532     ( -0.0841517   0.0833578 )
Norm@50keV  : 1.83911E-03    ( -8.86058e-05   8.82366e-05 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          70.96 using 59 PHA bins.
# Reduced chi-squared =          1.245 for     57 degrees of freedom 
# Null hypothesis probability =   1.011420e-01
 
Photon flux (15-150 keV)    in 266.4 sec: 0.246466 ( -0.011795  0.011819 ) ph/cm2/s
Energy fluence (15-150 keV)             : 4.52851e-06 ( -2.26568e-07  2.27629e-07 ) ergs/cm2
 

Cutoff power-law model

Time interval is from    1.624 sec. to  267.996 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.34163     ( -0.334473   0.362809 )
Epeak [keV] : 83.5640      ( -19.8877 191.003 )
Norm@50keV  : 2.89137E-03    ( -0.000922551   0.00150532 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          67.09 using 59 PHA bins.
# Reduced chi-squared =          1.198 for     56 degrees of freedom 
# Null hypothesis probability =   1.473971e-01
 
Photon flux (15-150 keV)    in 266.4 sec: 0.241087 ( -0.012654  0.012666 ) ph/cm2/s
Energy fluence (15-150 keV)             : 4.38686e-06 ( -2.58154e-07  2.58015e-07 ) ergs/cm2
 

1-s peak spectrum fit

Power-law model

Time interval is from    8.408 sec. to    9.408 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.07164     ( -0.362549   0.395927 )
Norm@50keV  : 8.37679E-03    ( -0.00207923   0.00204806 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          64.44 using 59 PHA bins.
# Reduced chi-squared =          1.131 for     57 degrees of freedom 
# Null hypothesis probability =   2.324737e-01
 
Photon flux (15-150 keV)    in 1 sec: 0.969134 ( -0.246242  0.249866 ) ph/cm2/s
Energy fluence (15-150 keV)             : 8.84016e-08 ( -2.12788e-08  2.13119e-08 ) ergs/cm2
 

Cutoff power-law model

Time interval is from    8.408 sec. to    9.408 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 0.487317     ( -1.6674   2.79888 )
Epeak [keV] : 92.3218      ( -28.1254 -92.3219 )
Norm@50keV  : 4.07363E-02    ( -0.0407362   0.474174 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          62.03 using 59 PHA bins.
# Reduced chi-squared =          1.108 for     56 degrees of freedom 
# Null hypothesis probability =   2.699571e-01
 
Photon flux (15-150 keV)    in 1 sec: 0.927592 ( -0.248274  0.253708 ) ph/cm2/s
Energy fluence (15-150 keV)             : 8.46233e-08 ( -2.24348e-08  2.23314e-08 ) ergs/cm2
 

Time-resolved spectra

Distribution

T90 vs. Hardness ratio plot

T90                                   = 230.508 sec.
Hardness ratio (energy fluence ratio) = 1.20976191841

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

S(15-50 keV)  = 2.011831e-06
S(50-150 keV) = 2.516672e-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 = 9.652878819943155E-01, IMY = 9.332824055802651E-03

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:
-239.296000 1.624000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
135.5418 -40.6005    4.6  50.9   23.3   1.9344   2.5    2.8	Vela X-1                      
170.5743 -60.6067    5.0  47.9  -15.4   0.8009   2.3    7.7	Cen X-3                       
186.3186 -62.7987  178.7  48.9  -25.7  -0.0241  -0.1    9.4	GX 301-2                      
172.3388  30.5519    2.2  46.2  139.1   3.8983   5.2 ------	UNKNOWN                       
133.6641 -51.7266    2.6  55.9   10.8   4.5460   4.4 ------	UNKNOWN                       
202.4839  -5.9203    3.0  18.6 -139.0   0.6835   3.8 ------	UNKNOWN                       
225.2939  31.0733    2.2  59.1 -165.4   7.3814   5.4 ------	UNKNOWN                       
162.5097 -71.8780    3.1  59.6  -17.1   4.5594   3.7 ------	UNKNOWN                       
193.0761 -62.9208    3.3  49.3  -29.8   1.3724   3.6 ------	UNKNOWN                       

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

Time interval of the image:
1.624000 60.804600
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
135.4848 -40.4281    5.5  50.9   23.5  -0.7477  -2.1    7.9	Vela X-1                      
170.2624 -60.5589    3.9  47.9  -15.2   0.4670   3.0    4.2	Cen X-3                       
186.3233 -62.8733   10.3  49.0  -25.7   0.2186   1.1   11.0	GX 301-2                      
157.5419 -51.7953    0.6  44.0   -0.6   3.0019  20.1 ------	UNKNOWN                       
165.1126 -70.2632    2.2  57.7  -17.2   2.0820   5.2 ------	UNKNOWN                       

Post-slew image of 15-350 keV band

Time interval of the image:
148.604600 585.904650
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
135.5866 -40.5201    1.8  18.8    6.5   1.7071   6.6    3.4	Vela X-1                      
170.4059 -60.5864    1.6  11.3 -145.5   2.1937   7.1    3.4	Cen X-3                       
186.3369 -62.8533    6.8  18.8 -154.5   0.5168   1.7   10.1	GX 301-2                      
145.1730 -16.6425    3.5  36.5   48.2   1.7409   3.3 ------	UNKNOWN                       
157.5321 -51.7906    0.8   0.0  -81.0   3.5937  13.8 ------	UNKNOWN                       
 50.1829 -81.9327    3.3  41.2  -99.9   6.1717   3.5 ------	UNKNOWN