GRB050814: 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 20:57:08 EST 2014
             Host Name: batevent1
   Current Working Dir: /local/data/batevent/batevent_reproc/trigger150314
======================================================================

  Trigger: 00150314      Segment: 000

  BAT Trigger Time: 145712336.64   [s; MET]
      Trigger Stop: 145712353.024   [s; MET]
               UTC: 2005-08-14T11:38:56.966000    [includes UTCF correction] 
       Where From?: TDRSS position message

  BAT 
    RA: 264.203808814218   Dec: 46.3327854969257  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    6.81
     Image Trigger?:     NO
     Rate S/N Ratio:     9.1104335791443  [ if not an image trigger ]
     Image S/N Ratio:    6.81

  Analysis Position:   [ source = BAT ]
    RA: 264.203808814218   Dec: 46.3327854969257  [deg; J2000]

  Refined Position:   [ source = BAT pre-slew burst ]
    RA: 264.195933871896   Dec: 46.3376383588836  [deg; J2000]  
        { 17h 36m 47.0s , +46d 20' 15.5" }
         +/- 1.95665872281777 [arcmin] (estimated 90% radius based on SNR)
         +/- 0.893911385446911 [arcmin] (formal 1-sigma fit error)
    SNR: 11.659186811841
 
  Angular difference between the analysis and refined position is 0.437272 arcmin
 
  Partial Coding Fraction: 0.2617188    [ including projection effects ]

  Duration
     T90: 142.851999998093 +/- 41.6607568695614
        Measured from: -0.0799999833106995
                   to: 142.772000014782     [s; relative to TRIGTIME]
     T50: 53.9280000030994 +/- 19.6710813001249
        Measured from: 12.9320000112057
                   to: 66.8600000143051     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: 5.47200000286102     
                   to: 6.47200000286102     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: -4.55599999427795     
                   to: 175.480000019073     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     0.931661   1.236049   0.782515   0.110095
           0.097825   0.101420   0.089746   0.082321 [error]
 Peak      0.017612   0.027460   0.031321   0.007483
           0.009848   0.009792   0.008738   0.007754 [error]

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

======================================================================
 
 
====== Table of the duration information =============================
 
        Value   tstart    tstop
T100  180.036   -4.556  175.480
T90   142.852   -0.080  142.772
T50    53.928   12.932   66.860
Peak    1.000    5.472    6.472
 
 
====== 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      -1.747    -0.169      0.164       -           -               -         1.15e-03     -1.21e-04          1.19e-04      59.190   57
CPL     -0.995    -0.675      0.803       61.758     -13.886       110.386      2.91e-03     -1.62e-03          4.84e-03      55.500   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      -1.638     -0.697     0.640       -           -               -         5.18e-03     -2.07e-03          1.98e-03      47.280   57
CPL     -0.874     -1.382     4.155       74.905     -74.905       -74.905      1.25e-02     -1.25e-02          9.00e-01      47.000   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   3.33e-07  5.26e-07  6.27e-07  1.45e-06  1.91e-06  2.94e-06   erg/cm2
      90%_error_low -4.75e-08 -4.96e-08 -8.78e-08 -3.77e-07 -2.06e-07 -4.69e-07   erg/cm2
      90%_error_hi   4.91e-08  4.97e-08  8.81e-08  4.56e-07  2.09e-07  5.30e-07   erg/cm2
Peak flux       PL   2.44e-01  2.26e-01  1.45e-01  1.44e-01  6.74e-01  7.58e-01   ph/cm2/s
      90%_error_low -1.33e-01 -8.78e-02 -7.11e-02 -1.02e-01 -2.52e-01 -2.79e-01   ph/cm2/s
      90%_error_hi   1.55e-01  8.58e-02  6.95e-02  1.84e-01  2.53e-01  2.81e-01   ph/cm2/s
 
Fluence        CPL   3.01e-07  5.72e-07  6.36e-07  5.00e-07  1.79e-06  2.01e-06   erg/cm2
      90%_error_low -5.59e-08 -6.42e-08 -9.86e-08 -2.94e-07 -2.25e-07 -3.75e-07   erg/cm2
      90%_error_hi   5.65e-08  6.66e-08  9.78e-08  7.81e-07  2.31e-07  7.92e-07   erg/cm2
Peak flux      CPL   2.11e-01  2.42e-01  1.56e-01  7.02e-02  6.54e-01  6.79e-01   ph/cm2/s
      90%_error_low -1.67e-01 -1.02e-01 -7.94e-02 -7.02e-02 -2.65e-01     N/A     ph/cm2/s
      90%_error_hi   1.78e-01  1.08e-01  8.76e-02  1.13e-01  2.62e-01     N/A     ph/cm2/s
 
======================================================================

Image

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

#   RAcent    DECcent   POSerr    Theta     Phi              Peak Cts       SNR   Name
  264.1959    46.3376   0.0165    39.6577    36.8678         2.0400041     11.659 TRIG_00150314                 
 
Foreground time interval of the image:
 -4.556  65.061 (delta_t =  69.617 [sec])
Background time interval of the image:
-299.640  -4.556 (delta_t = 295.084 [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   -4.556 sec. to  175.480 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.74676     ( -0.169071   0.164045 )
Norm@50keV  : 1.14752E-03    ( -0.000120602   0.000118996 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          59.19 using 59 PHA bins.
# Reduced chi-squared =          1.038 for     57 degrees of freedom 
# Null hypothesis probability =   3.954683e-01
 
Photon flux (15-150 keV)    in 180 sec: 0.154986 ( -0.014753  0.014765 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.90656e-06 ( -2.06194e-07  2.0884e-07 ) ergs/cm2
 

Cutoff power-law model

Time interval is from   -4.556 sec. to  175.480 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -0.99458     ( -0.674512   0.802598 )
Epeak [keV] : 61.7575      ( -13.8865 110.385 )
Norm@50keV  : 2.90550E-03    ( -0.00161665   0.00483998 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          55.50 using 59 PHA bins.
# Reduced chi-squared =         0.9911 for     56 degrees of freedom 
# Null hypothesis probability =   4.936525e-01
 
Photon flux (15-150 keV)    in 180 sec: 0.150156 ( -0.015379  0.015374 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.79189e-06 ( -2.24629e-07  2.30857e-07 ) ergs/cm2
 

1-s peak spectrum fit

Power-law model

Time interval is from    5.472 sec. to    6.472 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.6379     ( -0.696792   0.639598 )
Norm@50keV  : 5.18440E-03    ( -0.00206756   0.00198049 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          47.28 using 59 PHA bins.
# Reduced chi-squared =         0.8294 for     57 degrees of freedom 
# Null hypothesis probability =   8.172020e-01
 
Photon flux (15-150 keV)    in 1 sec: 0.674304 ( -0.251999  0.253315 ) ph/cm2/s
Energy fluence (15-150 keV)             : 4.82836e-08 ( -1.94619e-08  2.00651e-08 ) ergs/cm2
 

Cutoff power-law model

Time interval is from    5.472 sec. to    6.472 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -0.873915     ( -1.38468   4.15193 )
Epeak [keV] : 74.9051      ( -74.8197 -74.8197 )
Norm@50keV  : 1.25009E-02    ( -0.0125448   0.900061 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          47.00 using 59 PHA bins.
# Reduced chi-squared =         0.8393 for     56 degrees of freedom 
# Null hypothesis probability =   7.986031e-01
 
Photon flux (15-150 keV)    in 1 sec: 0.654074 ( -0.265346  0.261913 ) ph/cm2/s
Energy fluence (15-150 keV)             : 4.64344e-08 ( -1.94831e-08  2.08044e-08 ) ergs/cm2
 

Time-resolved spectra

Distribution

T90 vs. Hardness ratio plot

T90                                   = 142.852 sec.
Hardness ratio (energy fluence ratio) = 1.19192797624

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

S(15-50 keV)  = 8.585984e-07
S(50-150 keV) = 1.0479939e-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 = 6.631946392069351E-01, IMY = -4.973582093147902E-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:
-299.640000 -4.556000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
254.6101  35.3557    7.0  30.9   53.9   0.4625   1.6    7.5	Her X-1                       
245.6881  73.3097    2.5  47.6   -3.0   1.5541   4.6 ------	UNKNOWN                       
193.8049 -25.9189    3.6  59.0 -166.1   4.2871   3.2 ------	UNKNOWN                       
193.6253   3.3901    2.5  34.6 -143.3   1.0385   4.6 ------	UNKNOWN                       

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

Time interval of the image:
-4.556000 65.060620
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
254.4277  35.3928    6.0  30.7   53.8   0.2464   1.9    3.4	Her X-1                       
264.1959  46.3376    1.0  39.7   36.9   2.0394  11.7 ------	UNKNOWN                       
265.1180  59.1741    2.9  44.2   18.9   0.7380   4.0 ------	UNKNOWN                       
185.5177  -5.4571    2.3  46.6 -143.3   0.8885   4.9 ------	UNKNOWN                       

Post-slew image of 15-350 keV band

Time interval of the image:
121.860600 302.377600
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
254.6241  35.3027    4.1  13.2 -175.3   0.3892   2.8    8.5	Her X-1                       
268.3057  -1.4565    7.1  47.9  142.7   0.9728   1.6    3.7	SW J1753.5-0127               
299.6013  35.1970    0.4  28.7   68.2   6.8749  32.3    0.6	Cyg X-1                       
308.0904  40.9787    1.6  31.8   51.7   1.6491   7.3    1.8	Cyg X-3                       
326.0058  38.3233    4.1  45.2   45.2  -1.5135  -2.9    7.8	Cyg X-2                       
239.0385   6.8079    2.1  45.1 -175.2   1.4055   5.4 ------	UNKNOWN                       
235.5188  27.9034    3.2  29.1 -151.1   0.5265   3.6 ------	UNKNOWN                       
213.6398  12.8187    3.5  54.0 -143.2   3.5048   3.4 ------	UNKNOWN