GRB060801: 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 14:43:43 EST 2014
             Host Name: batevent1
   Current Working Dir: /local/data/batevent/batevent_reproc/trigger222154
======================================================================

  Trigger: 00222154      Segment: 000

  BAT Trigger Time: 176127376.512   [s; MET]
      Trigger Stop: 176127377.024   [s; MET]
               UTC: 2006-08-01T12:16:15.158880    [includes UTCF correction] 
       Where From?: TDRSS position message

  BAT 
    RA: 213.024750261889   Dec: 16.984129194985  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    9.35
     Image Trigger?:     NO
     Rate S/N Ratio:     30.0333148353624  [ if not an image trigger ]
     Image S/N Ratio:    9.35

  Analysis Position:   [ source = BAT ]
    RA: 213.024750261889   Dec: 16.984129194985  [deg; J2000]

  Refined Position:   [ source = BAT pre-slew burst ]
    RA: 212.984738857627   Dec: 16.9870296817693  [deg; J2000]  
        { 14h 11m 56.3s , +16d 59' 13.3" }
         +/- 1.7885362900214 [arcmin] (estimated 90% radius based on SNR)
         +/- 0.753757204103084 [arcmin] (formal 1-sigma fit error)
    SNR: 13.2558413962316
 
  Angular difference between the analysis and refined position is 2.302548 arcmin
 
  Partial Coding Fraction: 1.015625    [ including projection effects ]

  Duration
     T90: 0.504000008106232 +/- 0.0609262026599676
        Measured from: 0.0520000159740448
                   to: 0.556000024080276     [s; relative to TRIGTIME]
     T50: 0.316000014543533 +/- 0.0688185926298914
        Measured from: 0.120000004768372
                   to: 0.436000019311905     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: -0.183999985456467     
                   to: 0.816000014543533     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: 0.0399999916553497     
                   to: 0.587999999523163     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     0.007862   0.028137   0.042293   0.018488
           0.003589   0.004130   0.004067   0.003860 [error]
 Peak      0.012885   0.028325   0.043604   0.022565
           0.004695   0.005208   0.005002   0.004726 [error]

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

======================================================================
 
 
====== Table of the duration information =============================
 
        Value   tstart    tstop
T100    0.548    0.040    0.588
T90     0.504    0.052    0.556
T50     0.316    0.120    0.436
Peak    1.000   -0.184    0.816
 
 
====== 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: 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      -0.484    -0.224      0.242       -           -               -         1.08e-02     -1.56e-03          1.52e-03      73.430   57
CPL      0.283    -0.851      1.288      190.291      N/A           N/A         2.16e-02        N/A               N/A         71.740   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      -0.531     -0.265     0.290       -           -               -         6.49e-03     -1.08e-03          1.05e-03      58.320   57
CPL     -0.080     -0.567     1.507      272.780    -272.780      -272.780      9.73e-03     -4.13e-03          2.46e-02      57.900   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   2.96e-09  1.02e-08  2.92e-08  2.55e-07  8.05e-08  2.97e-07   erg/cm2
      90%_error_low -8.56e-10 -1.90e-09 -3.60e-09 -6.80e-08 -1.04e-08 -6.94e-08   erg/cm2
      90%_error_hi   9.71e-10  1.88e-09  3.59e-09  8.69e-08  1.04e-08  8.69e-08   erg/cm2
Peak flux       PL   1.06e-01  1.92e-01  2.66e-01  7.66e-01  7.65e-01  1.33e+00   ph/cm2/s
      90%_error_low -3.61e-02 -4.30e-02 -3.75e-02 -2.21e-01 -1.12e-01 -2.31e-01   ph/cm2/s
      90%_error_hi   4.23e-02  4.27e-02  3.74e-02  2.86e-01  1.12e-01  2.66e-01   ph/cm2/s
 
Fluence        CPL   2.30e-09  1.03e-08  3.18e-08  1.11e-07  7.84e-08  1.56e-07   erg/cm2
      90%_error_low -1.06e-09 -2.11e-09 -4.85e-09 -6.66e-08 -1.13e-08 -6.61e-08   erg/cm2
      90%_error_hi   1.24e-09  2.08e-09  4.97e-09  1.25e-07  1.10e-08  9.77e-08   erg/cm2
Peak flux      CPL   9.11e-02  1.92e-01  2.80e-01  5.11e-01  7.52e-01  1.07e+00   ph/cm2/s
      90%_error_low -4.76e-02 -4.64e-02 -4.83e-02     N/A   -1.17e-01 -3.37e-01   ph/cm2/s
      90%_error_hi   5.38e-02  4.53e-02  5.33e-02     N/A    1.17e-01  3.63e-01   ph/cm2/s
 
======================================================================

Image

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

#   RAcent    DECcent   POSerr    Theta     Phi              Peak Cts       SNR   Name
  212.9847    16.9870   0.0145     9.0532   150.5733         0.0999093     13.256 TRIG_00222154                 
 
Foreground time interval of the image:
  0.040   0.588 (delta_t =   0.548 [sec])
Background time interval of the image:
-239.512   0.040 (delta_t = 239.552 [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    0.040 sec. to    0.588 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -0.483733     ( -0.223854   0.241854 )
Norm@50keV  : 1.08415E-02    ( -0.0015633   0.00152089 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          73.43 using 59 PHA bins.
# Reduced chi-squared =          1.288 for     57 degrees of freedom 
# Null hypothesis probability =   7.042899e-02
 
Photon flux (15-150 keV)    in 0.548 sec: 1.28747 ( -0.16201  0.16262 ) ph/cm2/s
Energy fluence (15-150 keV)             : 8.04913e-08 ( -1.03699e-08  1.04163e-08 ) ergs/cm2
 

Cutoff power-law model

Time interval is from    0.040 sec. to    0.588 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 0.282657     ( -0.851151   1.28846 )
Epeak [keV] : 190.291      (   )
Norm@50keV  : 2.16014E-02    (     )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          71.74 using 59 PHA bins.
# Reduced chi-squared =          1.281 for     56 degrees of freedom 
# Null hypothesis probability =   7.656385e-02
 
Photon flux (15-150 keV)    in 0.548 sec: 1.25487 ( -0.16794  0.16815 ) ph/cm2/s
Energy fluence (15-150 keV)             : 7.83919e-08 ( -1.12984e-08  1.1021e-08 ) ergs/cm2
 

1-s peak spectrum fit

Power-law model

Time interval is from   -0.184 sec. to    0.816 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -0.530925     ( -0.265293   0.289923 )
Norm@50keV  : 6.48981E-03    ( -0.00108351   0.00104654 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          58.32 using 59 PHA bins.
# Reduced chi-squared =          1.023 for     57 degrees of freedom 
# Null hypothesis probability =   4.264378e-01
 
Photon flux (15-150 keV)    in 1 sec: 0.764870 ( -0.111772  0.112357 ) ph/cm2/s
Energy fluence (15-150 keV)             : 8.58539e-08 ( -1.27938e-08  1.28604e-08 ) ergs/cm2
 

Cutoff power-law model

Time interval is from   -0.184 sec. to    0.816 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -0.0804961     ( -0.566834   1.5066 )
Epeak [keV] : 272.780      ( -272.766 -272.766 )
Norm@50keV  : 9.72895E-03    ( -0.00413146   0.0246226 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          57.90 using 59 PHA bins.
# Reduced chi-squared =          1.034 for     56 degrees of freedom 
# Null hypothesis probability =   4.049557e-01
 
Photon flux (15-150 keV)    in 1 sec: 0.751853 ( -0.117276  0.117182 ) ph/cm2/s
Energy fluence (15-150 keV)             : 8.45026e-08 ( -1.38741e-08  1.34216e-08 ) ergs/cm2
 

Time-resolved spectra

Distribution

T90 vs. Hardness ratio plot

T90                                   = N/A sec.
Hardness ratio (energy fluence ratio) = N/A

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

S(15-50 keV)  = N/A
S(50-150 keV) = N/A

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 = -1.387802605343761E-01, IMY = -7.828382608907439E-02

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:
-239.512000 0.040000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
254.4061  35.4220    5.1  37.9   45.4   0.7933   2.3    5.4	Her X-1                       
229.8277 -15.6757    2.6  45.3  135.1   2.7189   4.4 ------	UNKNOWN                       
235.9618  37.5980    2.6  23.9   35.2   0.7209   4.5 ------	UNKNOWN                       
224.4958  33.1106    2.5  13.5   35.2   0.6702   4.6 ------	UNKNOWN                       
168.8896  40.3250    2.6  37.9  -76.3   1.9991   4.5 ------	UNKNOWN                       
165.8988  16.7730    3.5  43.1 -112.3   2.4872   3.3 ------	UNKNOWN                       

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

Time interval of the image:
0.040000 0.588000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
254.4936  35.2232   15.6  38.0   45.7  -0.0127  -0.7    7.4	Her X-1                       
260.5717  28.5425    2.3  43.5   55.5   0.1765   5.1 ------	UNKNOWN                       
212.9847  16.9870    0.9   9.1  150.6   0.0999  13.3 ------	UNKNOWN                       
193.8789   5.9810    2.0  26.0 -156.5   0.0465   5.6 ------	UNKNOWN                       
170.5111   3.7675    2.3  45.0 -132.0   0.1066   5.1 ------	UNKNOWN                       

Post-slew image of 15-350 keV band

Time interval of the image:
46.988600 962.568000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
254.4582  35.3455    5.0  41.1   40.2   2.1646   2.3    0.2	Her X-1                       
225.2253  25.4128    3.4  14.1   36.4   1.2574   3.4 ------	UNKNOWN                       
227.0607  40.1086    2.9  26.1    9.9   1.5971   3.9 ------	UNKNOWN                       
227.7178  44.7917    2.4  30.4    5.8   2.1852   4.9 ------	UNKNOWN                       
178.6260 -19.0276    3.0  49.4 -150.4   4.2166   3.9 ------	UNKNOWN