GRB150203A: 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: Tue Feb 17 21:25:53 EST 2015
             Host Name: bat1
   Current Working Dir: /local/data/bat1/alien/Swift_3rdBATcatalog/event/batevent_reproc/trigger629578
======================================================================

  Trigger: 00629578      Segment: 000

  BAT Trigger Time: 444629360.64   [s; MET]
      Trigger Stop: 444629361.664   [s; MET]
               UTC: 2015-02-03T04:09:07.504140    [includes UTCF correction] 
       Where From?: TDRSS position message

  BAT 
    RA: 98.4145772413157   Dec: 6.96780251737358  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    7.19
     Image Trigger?:     NO
     Rate S/N Ratio:     13.856406460551  [ if not an image trigger ]
     Image S/N Ratio:    7.19

  Analysis Position:   [ source = BAT ]
    RA: 98.4145772413157   Dec: 6.96780251737358  [deg; J2000]

  Refined Position:   [ source = BAT pre-slew burst ]
    RA: 98.3948712817831   Dec: 6.9510764827439  [deg; J2000]  
        { 06h 33m 34.8s , +06d 57' 03.9" }
         +/- 1.11590455607559 [arcmin] (estimated 90% radius based on SNR)
         +/- 0.387282757125004 [arcmin] (formal 1-sigma fit error)
    SNR: 26.0063699387057
 
  Angular difference between the analysis and refined position is 1.544209 arcmin
 
  Partial Coding Fraction: 0.84375    [ including projection effects ]

  Duration
     T90: 24.4359999299049 +/- 2.7678207947542
        Measured from: 0.396000027656555
                   to: 24.8319999575615     [s; relative to TRIGTIME]
     T50: 13.2559999227524 +/- 1.49024562519048
        Measured from: 5.28400003910065
                   to: 18.539999961853     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: 16.772000014782     
                   to: 17.772000014782     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: -0.803999960422516     
                   to: 28.7240000367165     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     0.561944   0.668993   0.360419   0.082240
           0.032057   0.032469   0.027036   0.021738 [error]
 Peak      0.034862   0.049194   0.025098   0.004147
           0.006059   0.006359   0.005213   0.004077 [error]

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

======================================================================
 
 
====== Table of the duration information =============================
 
        Value   tstart    tstop
T100   29.528   -0.804   28.724
T90    24.436    0.396   24.832
T50    13.256    5.284   18.540
Peak    1.000   16.772   17.772
 
 
====== 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      -1.810    -0.111      0.109       -           -               -         3.44e-03     -2.25e-04          2.23e-04      47.400   57
CPL     -1.611    -0.211      0.445       89.610     -32.258       -89.610      4.41e-03     -1.16e-03          3.18e-03      46.710   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      -1.753     -0.277     0.262       -           -               -         6.79e-03     -1.24e-03          1.21e-03      56.600   57
CPL     -0.885     -1.015     1.459       56.739     -17.222       -56.739      2.08e-02     -2.08e-02          1.18e-01      54.740   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   1.74e-07  2.64e-07  3.02e-07  6.57e-07  9.36e-07  1.40e-06   erg/cm2
      90%_error_low -1.63e-08 -1.56e-08 -2.69e-08 -1.14e-07 -6.21e-08 -1.40e-07   erg/cm2
      90%_error_hi   1.67e-08  1.56e-08  2.70e-08  1.30e-07  6.26e-08  1.52e-07   erg/cm2
Peak flux       PL   3.57e-01  3.09e-01  1.83e-01  1.64e-01  9.19e-01  1.01e+00   ph/cm2/s
      90%_error_low -8.06e-02 -4.90e-02 -4.24e-02 -6.28e-02 -1.45e-01 -1.63e-01   ph/cm2/s
      90%_error_hi   8.43e-02  4.89e-02  4.26e-02  8.23e-02  1.45e-01  1.64e-01   ph/cm2/s
 
Fluence        CPL   1.69e-07  2.70e-07  3.02e-07  4.65e-07  9.17e-07  1.21e-06   erg/cm2
      90%_error_low -1.88e-08 -1.89e-08 -2.78e-08 -2.27e-07 -7.23e-08 -2.40e-07   erg/cm2
      90%_error_hi   1.89e-08  1.99e-08  2.79e-08  2.25e-07  7.23e-08  2.48e-07   erg/cm2
Peak flux      CPL   3.24e-01  3.43e-01  1.88e-01  5.96e-02  8.98e-01  9.15e-01   ph/cm2/s
      90%_error_low -9.30e-02 -6.46e-02 -5.00e-02 -5.96e-02 -1.48e-01 -1.58e-01   ph/cm2/s
      90%_error_hi   9.41e-02  6.93e-02  4.84e-02  1.32e-01  1.48e-01  1.89e-01   ph/cm2/s
 
======================================================================

Image

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

#   RAcent    DECcent   POSerr    Theta     Phi              Peak Cts       SNR   Name
   98.3949     6.9511   0.0074    20.7333   148.5971         1.3842848     26.006 TRIG_00629578                 
 
Foreground time interval of the image:
 -0.804  20.061 (delta_t =  20.865 [sec])
Background time interval of the image:
-119.640  -0.804 (delta_t = 118.836 [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   -0.804 sec. to   28.724 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.81     ( -0.111008   0.109235 )
Norm@50keV  : 3.44253E-03    ( -0.000225158   0.000223035 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          47.40 using 59 PHA bins.
# Reduced chi-squared =         0.8316 for     57 degrees of freedom 
# Null hypothesis probability =   8.137181e-01
 
Photon flux (15-150 keV)    in 29.53 sec: 0.476251 ( -0.028643  0.028682 ) ph/cm2/s
Energy fluence (15-150 keV)             : 9.35693e-07 ( -6.20517e-08  6.25891e-08 ) ergs/cm2
 

Cutoff power-law model

Time interval is from   -0.804 sec. to   28.724 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.61104     ( -0.210637   0.445195 )
Epeak [keV] : 89.6103      ( -32.2589 -89.6107 )
Norm@50keV  : 4.40758E-03    ( -0.00115635   0.0031757 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          46.71 using 59 PHA bins.
# Reduced chi-squared =         0.8341 for     56 degrees of freedom 
# Null hypothesis probability =   8.072900e-01
 
Photon flux (15-150 keV)    in 29.53 sec: 0.471347 ( -0.030315  0.030289 ) ph/cm2/s
Energy fluence (15-150 keV)             : 9.17367e-07 ( -7.23346e-08  7.22871e-08 ) ergs/cm2
 

1-s peak spectrum fit

Power-law model

Time interval is from   16.772 sec. to   17.772 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.75268     ( -0.277169   0.26219 )
Norm@50keV  : 6.79267E-03    ( -0.00123847   0.00120833 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          56.60 using 59 PHA bins.
# Reduced chi-squared =         0.9930 for     57 degrees of freedom 
# Null hypothesis probability =   4.899358e-01
 
Photon flux (15-150 keV)    in 1 sec: 0.919435 ( -0.1453  0.145335 ) ph/cm2/s
Energy fluence (15-150 keV)             : 6.26787e-08 ( -1.15988e-08  1.18528e-08 ) ergs/cm2
 

Cutoff power-law model

Time interval is from   16.772 sec. to   17.772 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -0.885249     ( -1.01492   1.45856 )
Epeak [keV] : 56.7388      ( -17.2221 -56.7388 )
Norm@50keV  : 2.07868E-02    ( -0.0207868   0.118489 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          54.74 using 59 PHA bins.
# Reduced chi-squared =         0.9776 for     56 degrees of freedom 
# Null hypothesis probability =   5.224987e-01
 
Photon flux (15-150 keV)    in 1 sec: 0.898229 ( -0.147872  0.147831 ) ph/cm2/s
Energy fluence (15-150 keV)             : 5.83324e-08 ( -1.2276e-08  1.29792e-08 ) ergs/cm2
 

Time-resolved spectra

Distribution

T90 vs. Hardness ratio plot

T90                                   = 24.436 sec.
Hardness ratio (energy fluence ratio) = 1.14080096079

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

S(15-50 keV)  = 4.382354e-07
S(50-150 keV) = 4.974715e-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 = -3.230877964462633E-01, IMY = -1.972357388319213E-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:
-119.640000 -0.804000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
 83.6613  22.0330    0.3   0.0   87.3   5.0002  43.2    1.9	Crab                          
110.9537  24.5736    2.7  25.2   93.0   0.7037   4.2 ------	UNKNOWN                       
 84.7452  26.3256    0.9   4.4   27.1   1.5542  12.6 ------	UNKNOWN                       

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

Time interval of the image:
-0.804000 20.060600
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
 83.5383  21.9260    4.4   0.1 -122.7   0.1216   2.6    7.5	Crab                          
122.0222   7.9792    2.0  39.5  119.0   0.9148   5.6 ------	UNKNOWN                       
 98.3949   6.9511    0.4  20.7  148.6   1.3842  26.0 ------	UNKNOWN                       
 74.9797  10.0263    2.7  14.6 -129.8   0.2185   4.4 ------	UNKNOWN                       

Post-slew image of 15-350 keV band

Time interval of the image:
63.260580 1190.439600
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
 83.6342  22.0187    0.2  20.7  -23.6  46.4916  66.9    0.3	Crab                          
126.9250 -43.6270    3.0  56.8  173.9  16.0683   3.8 ------	UNKNOWN                       
103.0736  19.9358    2.7  13.7   37.1   2.7952   4.3 ------	UNKNOWN                       
102.9902 -10.2670    2.8  17.8 -176.6   2.6607   4.1 ------	UNKNOWN                       
118.1328 -44.0618    3.8  54.1 -179.2   8.0858   3.1 ------	UNKNOWN                       
 84.7342  26.3177    0.5  23.3  -14.1  17.0734  22.1 ------	UNKNOWN                       
109.6577 -49.5359    3.4  57.4 -170.4  10.7976   3.4 ------	UNKNOWN