GRB050128: 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: Wed Jan 22 23:09:09 EST 2014
             Host Name: batevent1
   Current Working Dir: /local/data/batevent/batevent_reproc/trigger103906
======================================================================

  Trigger: 00103906      Segment: 000

  BAT Trigger Time: 128578794.56   [s; MET]
      Trigger Stop: 128578795.584   [s; MET]
               UTC: 2005-01-28T04:19:55.191240    [includes UTCF correction] 
       Where From?: TDRSS position message

  BAT 
    RA: 219.591125684255   Dec: -34.7619892410826  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    12
     Image Trigger?:     NO
     Rate S/N Ratio:     35.5668384875575  [ if not an image trigger ]
     Image S/N Ratio:    12

  Analysis Position:   [ source = BAT ]
    RA: 219.591125684255   Dec: -34.7619892410826  [deg; J2000]

  Refined Position:   [ source = BAT pre-slew burst ]
    RA: 219.584372813514   Dec: -34.7623161882462  [deg; J2000]  
        { 14h 38m 20.2s , -34d 45' 44.3" }
         +/- 1.10700367612749 [arcmin] (estimated 90% radius based on SNR)
         +/- 0.306541241423414 [arcmin] (formal 1-sigma fit error)
    SNR: 26.3056047168613
 
  Angular difference between the analysis and refined position is 0.333437 arcmin
 
  Partial Coding Fraction: 0.1035156    [ including projection effects ]

  Duration
     T90: 28 +/- 9.05538513813742
        Measured from: -6.56000000238419
                   to: 21.4399999976158     [s; relative to TRIGTIME]
     T50: 8 +/- 1
        Measured from: -2.56000000238419
                   to: 5.43999999761581     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: 5.43999999761581     
                   to: 6.43999999761581     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: -7.56000000238419     
                   to: 25.4399999976158     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     1.385772   2.450934   2.426805   0.717987
           0.091115   0.099820   0.092650   0.070412 [error]
 Peak      0.163155   0.271392   0.330029   0.083939
           0.020360   0.024358   0.024849   0.016711 [error]

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

======================================================================
 
 
====== Table of the duration information =============================
 
        Value   tstart    tstop
T100   33.000   -7.560   25.440
T90    28.000   -6.560   21.440
T50     8.000   -2.560    5.440
Peak    1.000    5.440    6.440
 
 
====== 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: CPL)
 
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      -1.370    -0.071      0.071       -           -               -         1.62e-02     -6.92e-04          6.92e-04      63.340   57
CPL     -0.714    -0.311      0.335      113.155     -20.062        49.246      3.18e-02     -8.46e-03          1.24e-02      49.460   56
 
 
=== 1-s peak spectral analysis ===
(Best model with acceptable fit: N/A)
 
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      -1.319     -0.142     0.142       -           -               -         6.22e-02     -5.43e-03          5.43e-03      72.380   57
CPL     -0.470     -0.623     0.725      107.034     -24.554       120.997      1.46e-01     -6.63e-02          1.43e-01      66.740   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   6.06e-07  1.21e-06  1.87e-06  6.34e-06  5.21e-06  1.00e-05   erg/cm2
      90%_error_low -4.94e-08 -6.09e-08 -8.93e-08 -6.40e-07 -2.28e-07 -6.94e-07   erg/cm2
      90%_error_hi   5.07e-08  6.06e-08  8.90e-08  6.83e-07  2.28e-07  7.27e-07   erg/cm2
Peak flux       PL   2.15e+00  2.41e+00  1.93e+00  2.58e+00  7.45e+00  9.08e+00   ph/cm2/s
      90%_error_low -3.39e-01 -2.46e-01 -1.92e-01 -4.87e-01 -6.83e-01 -8.02e-01   ph/cm2/s
      90%_error_hi   3.58e-01  2.44e-01  1.90e-01  5.43e-01  6.85e-01  8.06e-01   ph/cm2/s
 
Fluence        CPL   5.13e-07  1.26e-06  2.01e-06  3.14e-06  5.11e-06  6.92e-06   erg/cm2
      90%_error_low -6.22e-08 -6.79e-08 -1.12e-07 -8.00e-07 -2.37e-07 -8.13e-07   erg/cm2
      90%_error_hi   6.42e-08  6.85e-08  1.14e-07  1.15e-06  2.37e-07  1.14e-06   erg/cm2
Peak flux      CPL   1.70e+00  2.51e+00  2.17e+00  1.41e+00  7.21e+00  7.79e+00   ph/cm2/s
      90%_error_low -4.42e-01 -2.74e-01 -2.59e-01 -4.86e-01 -7.06e-01 -9.03e-01   ph/cm2/s
      90%_error_hi   4.69e-01  2.75e-01  2.67e-01  7.90e-01  7.08e-01  1.05e+00   ph/cm2/s
 
======================================================================

Image

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

#   RAcent    DECcent   POSerr    Theta     Phi              Peak Cts       SNR   Name
  219.5844   -34.7623   0.0072    51.4509   -36.1965         6.9394960     26.306 TRIG_00103906                 
 
Foreground time interval of the image:
 -7.560  10.941 (delta_t =  18.501 [sec])
Background time interval of the image:
-299.560  -7.560 (delta_t = 292.000 [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   -7.560 sec. to   25.440 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.36995     ( -0.0711243   0.0714256 )
Norm@50keV  : 1.62356E-02    ( -0.000692201   0.000691907 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          63.34 using 59 PHA bins.
# Reduced chi-squared =          1.111 for     57 degrees of freedom 
# Null hypothesis probability =   2.628274e-01
 
Photon flux (15-150 keV)    in 33 sec: 1.96417 ( -0.09165  0.09192 ) ph/cm2/s
Energy fluence (15-150 keV)             : 5.21044e-06 ( -2.27975e-07  2.28375e-07 ) ergs/cm2
 

Cutoff power-law model

Time interval is from   -7.560 sec. to   25.440 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -0.71363     ( -0.311401   0.334615 )
Epeak [keV] : 113.155      ( -20.0623 49.2456 )
Norm@50keV  : 3.17596E-02    ( -0.00846151   0.0124245 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          49.46 using 59 PHA bins.
# Reduced chi-squared =         0.8832 for     56 degrees of freedom 
# Null hypothesis probability =   7.190460e-01
 
Photon flux (15-150 keV)    in 33 sec: 1.90137 ( -0.09546  0.096 ) ph/cm2/s
Energy fluence (15-150 keV)             : 5.1052e-06 ( -2.37161e-07  2.36679e-07 ) ergs/cm2
 

1-s peak spectrum fit

Power-law model

Time interval is from    5.440 sec. to    6.440 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.31935     ( -0.142389   0.14162 )
Norm@50keV  : 6.22358E-02    ( -0.00543228   0.00543215 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          72.38 using 59 PHA bins.
# Reduced chi-squared =          1.270 for     57 degrees of freedom 
# Null hypothesis probability =   8.241555e-02
 
Photon flux (15-150 keV)    in 1 sec: 7.45209 ( -0.68277  0.68454 ) ph/cm2/s
Energy fluence (15-150 keV)             : 6.12224e-07 ( -5.68315e-08  5.70285e-08 ) ergs/cm2
 

Cutoff power-law model

Time interval is from    5.440 sec. to    6.440 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -0.470178     ( -0.623136   0.725412 )
Epeak [keV] : 107.034      ( -24.5538 120.997 )
Norm@50keV  : 0.145660    ( -0.0663435   0.142881 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          66.74 using 59 PHA bins.
# Reduced chi-squared =          1.192 for     56 degrees of freedom 
# Null hypothesis probability =   1.541307e-01
 
Photon flux (15-150 keV)    in 1 sec: 7.20845 ( -0.70622  0.70791 ) ph/cm2/s
Energy fluence (15-150 keV)             : 6.05006e-07 ( -5.83174e-08  5.82329e-08 ) ergs/cm2
 

Time-resolved spectra

Distribution

T90 vs. Hardness ratio plot

T90                                   = 28.0 sec.
Hardness ratio (energy fluence ratio) = 1.60125318493

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

S(15-50 keV)  = 1.7684578e-06
S(50-150 keV) = 3.336805e-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 = 1.012749232335095E+00, IMY = 7.411253042549734E-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:
-299.560000 -7.560000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
225.7320 -30.7524    3.0  50.7  -44.5   3.3675   3.8 ------	UNKNOWN                       
243.3010  16.5354    2.8  43.5 -114.8   3.1535   4.1 ------	UNKNOWN                       

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

Time interval of the image:
-7.560000 10.940600
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
206.3397 -17.8048    2.3  31.4  -28.4   0.2641   5.1 ------	UNKNOWN                       
219.5844 -34.7623    0.4  51.5  -36.2   6.9400  26.3 ------	UNKNOWN                       

Post-slew image of 15-350 keV band

Time interval of the image:
75.540590 302.524600
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
170.3306 -60.5856    2.2  40.5   19.2   1.5625   5.2    2.3	Cen X-3                       
186.6784 -62.7963    2.5  34.7   10.1   1.0589   4.7    1.7	GX 301-2                      
244.9798 -15.6421    0.2  29.8 -139.3  10.4971  49.2    0.1	Sco X-1                       
256.0212 -37.7907    2.0  29.4  -89.0   1.4112   5.8    3.6	4U 1700-377                   
256.5429 -36.5446    6.5  29.9  -91.4   0.4408   1.8    9.0	GX 349+2                      
262.9812 -24.8674    4.7  38.7 -108.5   1.0463   2.4    7.5	GX 1+4                        
264.9228 -44.3841   51.6  35.8  -76.2  -0.0850  -0.2    8.7	4U 1735-44                    
263.0027 -33.7278    4.2  35.7  -94.7   1.0624   2.8    6.5	GX 354-0                      
259.5506   3.8937    2.7  53.9 -143.2   3.6802   4.2 ------	UNKNOWN