GRB050803: 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 21:02:53 EST 2014
             Host Name: batevent1
   Current Working Dir: /local/data/batevent/batevent_reproc/trigger148833
======================================================================

  Trigger: 00148833      Segment: 000

  BAT Trigger Time: 144789240   [s; MET]
      Trigger Stop: 144789312   [s; MET]
               UTC: 2005-08-03T19:14:00.344280    [includes UTCF correction] 
       Where From?: TDRSS position message

  BAT 
    RA: 350.649603158297   Dec: 5.80000785143894  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    7.61
     Image Trigger?:     YES
     Rate S/N Ratio:     0  [ if not an image trigger ]
     Image S/N Ratio:    7.61

  Analysis Position:   [ source = BAT ]
    RA: 350.649603158297   Dec: 5.80000785143894  [deg; J2000]

  Refined Position:   [ source = BAT pre-slew burst ]
    RA: 350.646042147815   Dec: 5.78774295338059  [deg; J2000]  
        { 23h 22m 35.1s , +05d 47' 15.9" }
         +/- 1.23106856951568 [arcmin] (estimated 90% radius based on SNR)
         +/- 0.354510520320133 [arcmin] (formal 1-sigma fit error)
    SNR: 22.6018374126796
 
  Angular difference between the analysis and refined position is 0.765980 arcmin
 
  Partial Coding Fraction: 0.3828125    [ including projection effects ]

  Duration
     T90: 88.1240000128746 +/- 10.1971862853614
        Measured from: 62.2479999959469
                   to: 150.372000008821     [s; relative to TRIGTIME]
     T50: 38.0760000050068 +/- 7.45741965813393
        Measured from: 70.8560000061989
                   to: 108.932000011206     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: 147.108000010252     
                   to: 148.108000010252     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: 59.5839999914169     
                   to: 165.124000012875     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     0.897512   1.131649   0.991604   0.298630
           0.061681   0.063936   0.055551   0.046082 [error]
 Peak      0.026590   0.046683   0.037059   0.016998
           0.004603   0.005044   0.004681   0.003774 [error]

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

======================================================================
 
 
====== Table of the duration information =============================
 
        Value   tstart    tstop
T100  105.540   59.584  165.124
T90    88.124   62.248  150.372
T50    38.076   70.856  108.932
Peak    1.000  147.108  148.108
 
 
====== 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      -1.392    -0.106      0.106       -           -               -         2.12e-03     -1.22e-04          1.22e-04      49.580   57
CPL     -1.356    -0.141      0.359      952.762    -952.762      -952.762      2.21e-03     -2.00e-04          9.88e-04      49.630   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      -1.234     -0.209     0.212       -           -               -         8.11e-03     -9.47e-04          9.45e-04      46.180   57
CPL     -1.234     -0.207     0.312     9999.360    -9999.360      -9999.360      8.15e-03     -7.25e-03          -4.87e-03      46.200   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   2.58e-07  5.07e-07  7.72e-07  2.56e-06  2.16e-06  4.10e-06   erg/cm2
      90%_error_low -2.83e-08 -3.31e-08 -5.53e-08 -3.92e-07 -1.35e-07 -4.29e-07   erg/cm2
      90%_error_hi   2.93e-08  3.29e-08  5.50e-08  4.40e-07  1.36e-07  4.68e-07   erg/cm2
Peak flux       PL   2.59e-01  3.05e-01  2.60e-01  3.74e-01  9.57e-01  1.20e+00   ph/cm2/s
      90%_error_low -5.51e-02 -4.05e-02 -3.74e-02 -1.03e-01 -1.12e-01 -1.49e-01   ph/cm2/s
      90%_error_hi   5.81e-02  3.97e-02  3.68e-02  1.27e-01  1.13e-01  1.54e-01   ph/cm2/s
 
Fluence        CPL   2.59e-07  5.07e-07  7.71e-07  2.61e-06  2.17e-06  4.12e-06   erg/cm2
      90%_error_low -3.00e-08 -3.27e-08 -5.51e-08 -1.31e-06 -1.48e-07 -1.11e-06   erg/cm2
      90%_error_hi   2.93e-08  3.62e-08  6.38e-08  5.07e-07  7.36e-08  2.28e-07   erg/cm2
Peak flux      CPL   2.59e-01  3.05e-01  2.59e-01  3.72e-01  9.57e-01  1.20e+00   ph/cm2/s
      90%_error_low     N/A       N/A       N/A       N/A   -1.12e-01 -1.96e-01   ph/cm2/s
      90%_error_hi      N/A       N/A       N/A       N/A    1.12e-01  7.85e-02   ph/cm2/s
 
======================================================================

Image

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

#   RAcent    DECcent   POSerr    Theta     Phi              Peak Cts       SNR   Name
  350.6460     5.7877   0.0085    34.6571    39.5558         1.6594723     22.602 TRIG_00148833                 
 
Foreground time interval of the image:
 59.584  81.501 (delta_t =  21.917 [sec])
Background time interval of the image:
-299.000  59.584 (delta_t = 358.584 [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   59.584 sec. to  165.124 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.39244     ( -0.106045   0.10632 )
Norm@50keV  : 2.11957E-03    ( -0.000121878   0.00012183 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          49.58 using 59 PHA bins.
# Reduced chi-squared =         0.8699 for     57 degrees of freedom 
# Null hypothesis probability =   7.466557e-01
 
Photon flux (15-150 keV)    in 105.5 sec: 0.257688 ( -0.015669  0.015726 ) ph/cm2/s
Energy fluence (15-150 keV)             : 2.16432e-06 ( -1.35413e-07  1.36073e-07 ) ergs/cm2
 

Cutoff power-law model

Time interval is from   59.584 sec. to  165.124 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.38911     ( -0.140548   0.359753 )
Epeak [keV] : 9999.25      ( -9999.25 -9999.25 )
Norm@50keV  : 2.12730E-03    ( -0.000122238   0.00106612 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          49.59 using 59 PHA bins.
# Reduced chi-squared =         0.8855 for     56 degrees of freedom 
# Null hypothesis probability =   7.147080e-01
 
Photon flux (15-150 keV)    in 105.5 sec: 0.257952 ( -0.017048  0.015743 ) ph/cm2/s
Energy fluence (15-150 keV)             : 2.16637e-06 ( -1.47991e-07  7.36027e-08 ) ergs/cm2
 

1-s peak spectrum fit

Power-law model

Time interval is from  147.108 sec. to  148.108 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.23417     ( -0.208983   0.211519 )
Norm@50keV  : 8.11185E-03    ( -0.000947142   0.000945399 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          46.18 using 59 PHA bins.
# Reduced chi-squared =         0.8102 for     57 degrees of freedom 
# Null hypothesis probability =   8.466251e-01
 
Photon flux (15-150 keV)    in 1 sec: 0.957005 ( -0.112382  0.112515 ) ph/cm2/s
Energy fluence (15-150 keV)             : 8.15361e-08 ( -1.09417e-08  1.10616e-08 ) ergs/cm2
 

Cutoff power-law model

Time interval is from  147.108 sec. to  148.108 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -2.43249     ( -0.20678   0.312032 )
Epeak [keV] : 141.405      ( -9999.36 -9999.36 )
Norm@50keV  : 1.63119E-03    ( -0.000731327   0.00164514 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          45.95 using 59 PHA bins.
# Reduced chi-squared =         0.8206 for     56 degrees of freedom 
# Null hypothesis probability =   8.287201e-01
 
Photon flux (15-150 keV)    in 1 sec: 0.956887 ( -0.112454  0.112443 ) ph/cm2/s
Energy fluence (15-150 keV)             : 8.27942e-08 ( 0  0 ) ergs/cm2
 

Time-resolved spectra

Distribution

T90 vs. Hardness ratio plot

T90                                   = 88.124 sec.
Hardness ratio (energy fluence ratio) = 1.52373684694

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

S(15-50 keV)  = 7.648406e-07
S(50-150 keV) = 1.399514e-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 = 5.330146659035959E-01, IMY = -4.402563902034786E-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:
-299.000000 59.584000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
299.5925  35.2004    0.3  31.1  156.9  12.8958  40.5    0.1	Cyg X-1                       
308.0973  40.9182    1.0  23.4  166.2   2.4185  11.6    2.1	Cyg X-3                       
325.9843  38.3560    4.9   9.9  153.0   0.5280   2.4    9.1	Cyg X-2                       
273.4155  28.5039    2.2  54.1  161.1   5.8975   5.2 ------	UNKNOWN                       
308.0689  37.6590    1.4  23.9  158.2   1.8756   8.1 ------	UNKNOWN                       
 34.7657  62.6406    3.0  41.0  -83.4   4.4559   3.8 ------	UNKNOWN                       

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

Time interval of the image:
59.584000 81.500600
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
299.4096  35.0919  175.8  31.3  156.8  -0.0036  -0.1   11.0	Cyg X-1                       
308.0245  41.1050   18.0  23.5  166.7  -0.0292  -0.6    9.9	Cyg X-3                       
326.2868  38.1431 1059.1   9.7  151.6  -0.0004  -0.0   12.0	Cyg X-2                       
350.6461   5.7877    0.5  34.7   39.6   1.6596  22.6 ------	UNKNOWN                       
297.1953  37.6910    2.7  32.3  162.5   0.2190   4.3 ------	UNKNOWN                       
291.0749  46.7117    2.8  35.3  179.8   0.2306   4.1 ------	UNKNOWN                       

Post-slew image of 15-350 keV band

Time interval of the image:
140.100590 303.111900
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
308.0062  40.8971    5.7  51.8  172.6   0.7448   2.0    5.8	Cyg X-3                       
326.1943  38.1347    0.0  39.2 -177.7  -0.3381  -2.0   11.3	Cyg X-2                       
356.5260 -38.3625    2.2  44.5   26.7   1.3801   5.2 ------	UNKNOWN                       
329.3347  12.7007    2.9  22.1  143.0   0.5110   4.0 ------	UNKNOWN                       
310.4249  47.5852    2.7  54.1 -179.3   1.6677   4.3 ------	UNKNOWN