GRB100522A: 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: Fri Jan 17 18:26:34 EST 2014
             Host Name: batevent1
   Current Working Dir: /local/data/batevent/batevent_reproc/trigger422783
======================================================================

  Trigger: 00422783      Segment: 000

  BAT Trigger Time: 296192758.144   [s; MET]
      Trigger Stop: 296192758.272   [s; MET]
               UTC: 2010-05-22T03:45:52.323860    [includes UTCF correction] 
       Where From?: TDRSS position message

  BAT 
    RA: 6.98318125259123   Dec: 9.41748845869158  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    11.03
     Image Trigger?:     NO
     Rate S/N Ratio:     26.9072480941474  [ if not an image trigger ]
     Image S/N Ratio:    11.03

  Analysis Position:   [ source = BAT ]
    RA: 6.98318125259123   Dec: 9.41748845869158  [deg; J2000]

  Refined Position:   [ source = BAT pre-slew burst ]
    RA: 6.98748352608652   Dec: 9.39525589353677  [deg; J2000]  
        { 00h 27m 57.0s , +09d 23' 42.9" }
         +/- 1.36551632807369 [arcmin] (estimated 90% radius based on SNR)
         +/- 0.626599897569068 [arcmin] (formal 1-sigma fit error)
    SNR: 19.4911335749695
 
  Angular difference between the analysis and refined position is 1.358045 arcmin
 
  Partial Coding Fraction: 0.71875    [ including projection effects ]

  Duration
     T90: 48 +/- 16
        Measured from: -15.1439999938011
                   to: 32.8560000061989     [s; relative to TRIGTIME]
     T50: 16 +/- 16
        Measured from: 0.856000006198883
                   to: 16.8560000061989     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: 8.35600000619888     
                   to: 9.35600000619888     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: -15.1439999938011     
                   to: 48.8560000061989     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     1.341262   1.468879   0.831959   0.134106
           0.051340   0.053474   0.049575   0.049436 [error]
 Peak      0.011312  -0.004565   0.001401   0.004388
           0.006501   0.006681   0.006365   0.006339 [error]

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

======================================================================
 
 
====== Table of the duration information =============================
 
        Value   tstart    tstop
T100   64.000  -15.144   48.856
T90    48.000  -15.144   32.856
T50    16.000    0.856   16.856
Peak    1.000    8.356    9.356
 
 
====== 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      -1.898    -0.095      0.094       -           -               -         3.51e-03     -1.89e-04          1.88e-04      42.320   57
CPL     -1.611    -0.337      0.386       60.608     -16.092       -60.608      5.01e-03     -1.61e-03          3.02e-03      40.400   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      -3.376      3.376     3.376       -           -               -         1.61e-04     -1.61e-04          1.29e-03      50.290   57
CPL     -0.718      N/A       N/A          16.213      N/A           N/A         9.42e-03        N/A               N/A         50.190   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   4.17e-07  6.02e-07  6.46e-07  1.29e-06  2.06e-06  2.95e-06   erg/cm2
      90%_error_low -3.15e-08 -2.76e-08 -4.91e-08 -1.95e-07 -1.09e-07 -2.41e-07   erg/cm2
      90%_error_hi   3.22e-08  2.76e-08  4.95e-08  2.19e-07  1.11e-07  2.59e-07   erg/cm2
Peak flux       PL   4.15e-02  1.41e-02  2.62e-03  6.15e-04  5.86e-02  5.67e-02   ph/cm2/s
      90%_error_low -4.15e-02 -1.41e-02 -2.62e-03 -6.15e-04 -5.86e-02 -5.67e-02   ph/cm2/s
      90%_error_hi   9.15e-02  5.24e-02  4.47e-02  7.03e-01  1.46e-01  6.74e-01   ph/cm2/s
 
Fluence        CPL   4.01e-07  6.18e-07  6.42e-07  7.83e-07  1.99e-06  2.44e-06   erg/cm2
      90%_error_low -3.72e-08 -3.38e-08 -5.22e-08 -3.40e-07 -1.36e-07 -3.75e-07   erg/cm2
      90%_error_hi   3.77e-08  3.43e-08  5.18e-08  5.66e-07  1.37e-07  6.07e-07   erg/cm2
Peak flux      CPL   4.35e-02  1.31e-02  3.01e-03  6.77e-04  5.80e-02  5.77e-02   ph/cm2/s
      90%_error_low -4.35e-02 -1.31e-02 -3.01e-03     N/A       N/A       N/A     ph/cm2/s
      90%_error_hi   8.97e-02  5.34e-02  4.22e-02     N/A       N/A       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
    6.9875     9.3953   0.0098    22.4505   -65.7879         2.6491002     19.491 TRIG_00422783                 
 
Foreground time interval of the image:
-15.144  10.157 (delta_t =  25.301 [sec])
Background time interval of the image:
-24.043 -15.144 (delta_t =   8.899 [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  -15.144 sec. to   48.856 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.89838     ( -0.0952915   0.0936803 )
Norm@50keV  : 3.50643E-03    ( -0.0001894   0.000187585 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          42.32 using 59 PHA bins.
# Reduced chi-squared =         0.7425 for     57 degrees of freedom 
# Null hypothesis probability =   9.265514e-01
 
Photon flux (15-150 keV)    in 64 sec: 0.502895 ( -0.023739  0.023783 ) ph/cm2/s
Energy fluence (15-150 keV)             : 2.06348e-06 ( -1.09502e-07  1.10621e-07 ) ergs/cm2
 

Cutoff power-law model

Time interval is from  -15.144 sec. to   48.856 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.61091     ( -0.337386   0.385944 )
Epeak [keV] : 60.6079      ( -16.0923 -60.6079 )
Norm@50keV  : 5.01308E-03    ( -0.00160674   0.00301805 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          40.40 using 59 PHA bins.
# Reduced chi-squared =         0.7215 for     56 degrees of freedom 
# Null hypothesis probability =   9.422250e-01
 
Photon flux (15-150 keV)    in 64 sec: 0.492996 ( -0.026522  0.026542 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.9948e-06 ( -1.35587e-07  1.37357e-07 ) ergs/cm2
 

1-s peak spectrum fit

Power-law model

Time interval is from    8.356 sec. to    9.356 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -3.37613     ( 3.37474   3.37474 )
Norm@50keV  : 1.60668E-04    ( -0.000160982   0.00128574 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          50.29 using 59 PHA bins.
# Reduced chi-squared =         0.8823 for     57 degrees of freedom 
# Null hypothesis probability =   7.228952e-01
 
Photon flux (15-150 keV)    in 1 sec: 5.86203E-02 ( -0.0586203  0.146324 ) ph/cm2/s
Energy fluence (15-150 keV)             : 2.36745e-09 ( 1  1.3689e-08 ) ergs/cm2
 

Cutoff power-law model

Time interval is from    8.356 sec. to    9.356 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 9.94442     (       )
Epeak [keV] : 21.1949      (   )
Norm@50keV  : 5.24097E+06    (     )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          49.75 using 59 PHA bins.
# Reduced chi-squared =         0.8883 for     56 degrees of freedom 
# Null hypothesis probability =   7.091390e-01
 
Photon flux (15-150 keV)    in 1 sec: 5.80083E-02 (    ) ph/cm2/s
Energy fluence (15-150 keV)             : 2.26016e-09 ( 0  0 ) ergs/cm2
 

Time-resolved spectra

Distribution

T90 vs. Hardness ratio plot

T90                                   = 48.0 sec.
Hardness ratio (energy fluence ratio) = 1.07300059655

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

S(15-50 keV)  = 1.0187017e-06
S(50-150 keV) = 1.0447863e-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 = 1.694607009765067E-01, IMY = 3.768543694834663E-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:
-24.043410 -15.144000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
299.6220  35.2054    3.3  48.8  158.8   0.3996   3.6    1.6	Cyg X-1                       
308.0912  40.8781    4.6  45.7  170.0  -0.1821  -2.5    4.6	Cyg X-3                       
325.9309  38.3672   13.4  34.3 -177.4  -0.0354  -0.9   11.7	Cyg X-2                       
355.4819 -44.3397    2.3  53.7   18.7   0.9583   4.9 ------	UNKNOWN                       
343.9796  26.2054    3.0  17.8 -152.3   0.1239   3.8 ------	UNKNOWN                       
352.4388  20.9371    2.2  14.8 -120.2   0.1753   5.2 ------	UNKNOWN                       
 22.9049  26.2905    3.0  40.8  -92.4   0.5747   3.9 ------	UNKNOWN                       

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

Time interval of the image:
-15.144000 10.156590
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
299.5045  35.1171  219.1  48.8  158.7  -0.0196  -0.1    6.6	Cyg X-1                       
308.0897  40.9283    6.0  45.7  170.0   0.4802   1.9    1.7	Cyg X-3                       
325.9443  38.3532    4.9  34.2 -177.4   0.3309   2.4   10.9	Cyg X-2                       
312.8184  60.1672    2.3  56.9 -169.5   2.4056   4.9 ------	UNKNOWN                       
  6.9875   9.3952    0.6  22.5  -65.8   2.6491  19.5 ------	UNKNOWN                       

Post-slew image of 15-350 keV band

Time interval of the image:
54.756600 962.910600
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
326.3492  38.2584    5.8  46.4  154.0   3.4438   2.0    9.2	Cyg X-2                       
322.2311  45.6179    3.1  52.6  160.6   9.6054   3.7 ------	UNKNOWN                       
 41.4155 -36.2309    4.6  56.0  -14.6   5.9108   2.5 ------	UNKNOWN                       
 31.4200  20.7883    3.3  26.2  -99.8   2.1899   3.5 ------	UNKNOWN