GRB150413A: 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: Tue May  5 17:36:22 EDT 2015
             Host Name: bat1
   Current Working Dir: /local/data/bat1/alien/Swift_3rdBATcatalog/event/batevent_reproc/trigger637899
======================================================================

  Trigger: 00637899      Segment: 000

  BAT Trigger Time: 450626112   [s; MET]
      Trigger Stop: 450626176   [s; MET]
               UTC: 2015-04-13T13:54:58.559120    [includes UTCF correction] 
       Where From?: TDRSS position message

  BAT 
    RA: 190.38502276655   Dec: 71.8238536834753  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    7.29
     Image Trigger?:     YES
     Rate S/N Ratio:     0  [ if not an image trigger ]
     Image S/N Ratio:    7.29

  Analysis Position:   [ source = BAT ]
    RA: 190.38502276655   Dec: 71.8238536834753  [deg; J2000]

  Refined Position:   [ source = BAT pre-slew burst ]
    RA: 190.392242434428   Dec: 71.8459518459589  [deg; J2000]  
        { 12h 41m 34.1s , +71d 50' 45.4" }
         +/- 1.98350294241877 [arcmin] (estimated 90% radius based on SNR)
         +/- 0.852647868844594 [arcmin] (formal 1-sigma fit error)
    SNR: 11.4344244644806
 
  Angular difference between the analysis and refined position is 1.332749 arcmin
 
  Partial Coding Fraction: 0.3554688    [ including projection effects ]

  Duration
     T90: 243.595999956131 +/- 40.8285297404122
        Measured from: -55.3600000143051
                   to: 188.235999941826     [s; relative to TRIGTIME]
     T50: 108.395999968052 +/- 11.239195679652
        Measured from: 4.10399997234344
                   to: 112.499999940395     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: 110.776000022888     
                   to: 111.776000022888     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: -73.0879999995232     
                   to: 207.955999970436     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     2.025272   2.560224   1.897605   0.341368
           0.171393   0.175431   0.148803   0.125068 [error]
 Peak      0.038011   0.075380   0.065714   0.011212
           0.011199   0.011847   0.010336   0.008348 [error]

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

======================================================================
 
 
====== Table of the duration information =============================
 
        Value   tstart    tstop
T100  281.044  -73.088  207.956
T90   243.596  -55.360  188.236
T50   108.396    4.104  112.500
Peak    1.000  110.776  111.776
 
 
====== 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      -1.684    -0.137      0.135       -           -               -         1.64e-03     -1.30e-04          1.29e-04      52.020   57
CPL     -1.484    -0.317      0.540      128.410     -62.201      -128.410      2.07e-03     -6.18e-04          1.77e-03      51.550   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      -1.439     -0.274     0.273       -           -               -         1.36e-02     -2.32e-03          2.32e-03      84.390   57
CPL     -0.041     -1.245     1.750       72.169     -17.479       142.892      6.58e-02     -6.58e-02          3.72e-01      80.610   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   7.00e-07  1.15e-06  1.43e-06  3.53e-06  4.27e-06  6.81e-06   erg/cm2
      90%_error_low -8.68e-08 -8.88e-08 -1.50e-07 -7.28e-07 -3.53e-07 -8.63e-07   erg/cm2
      90%_error_hi   9.00e-08  8.85e-08  1.50e-07  8.45e-07  3.56e-07  9.52e-07   erg/cm2
Peak flux       PL   5.29e-01  5.52e-01  4.07e-01  4.84e-01  1.67e+00  1.97e+00   ph/cm2/s
      90%_error_low -1.47e-01 -1.03e-01 -8.26e-02 -1.71e-01 -2.92e-01 -3.37e-01   ph/cm2/s
      90%_error_hi   1.60e-01  1.02e-01  8.17e-02  2.19e-01  2.93e-01  3.38e-01   ph/cm2/s
 
Fluence        CPL   6.77e-07  1.17e-06  1.45e-06  2.60e-06  4.21e-06  5.90e-06   erg/cm2
      90%_error_low -1.03e-07 -1.04e-07 -1.57e-07 -1.32e-06 -3.85e-07 -1.38e-06   erg/cm2
      90%_error_hi   9.75e-08  1.08e-07  1.61e-07  1.94e-06  3.85e-07  1.26e-06   erg/cm2
Peak flux      CPL   3.99e-01  6.15e-01  4.58e-01  1.54e-01  1.59e+00  1.63e+00   ph/cm2/s
      90%_error_low -1.77e-01 -1.25e-01 -9.99e-02 -1.54e-01 -3.04e-01 -3.29e-01   ph/cm2/s
      90%_error_hi   1.93e-01  1.30e-01  1.03e-01  2.71e-01  3.04e-01  3.76e-01   ph/cm2/s
 
======================================================================

Image

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

#   RAcent    DECcent   POSerr    Theta     Phi              Peak Cts       SNR   Name
  190.3922    71.8460   0.0167    36.1247   144.5838         6.3802320     11.434 TRIG_00637899                 
 
Foreground time interval of the image:
-73.088 207.956 (delta_t = 281.044 [sec])
Background time interval of the image:
-239.000 -73.088 (delta_t = 165.912 [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  -73.088 sec. to  207.956 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.68386     ( -0.136757   0.134626 )
Norm@50keV  : 1.64069E-03    ( -0.000129565   0.000128607 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          52.02 using 59 PHA bins.
# Reduced chi-squared =         0.9126 for     57 degrees of freedom 
# Null hypothesis probability =   6.620659e-01
 
Photon flux (15-150 keV)    in 281 sec: 0.216696 ( -0.016774  0.016808 ) ph/cm2/s
Energy fluence (15-150 keV)             : 4.27491e-06 ( -3.53461e-07  3.56212e-07 ) ergs/cm2
 

Cutoff power-law model

Time interval is from  -73.088 sec. to  207.956 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.48436     ( -0.317346   0.540462 )
Epeak [keV] : 128.410      ( -62.2004 -128.41 )
Norm@50keV  : 2.07263E-03    ( -0.000618271   0.00176506 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          51.55 using 59 PHA bins.
# Reduced chi-squared =         0.9205 for     56 degrees of freedom 
# Null hypothesis probability =   6.439987e-01
 
Photon flux (15-150 keV)    in 281 sec: 0.214523 ( -0.017603  0.017602 ) ph/cm2/s
Energy fluence (15-150 keV)             : 4.21354e-06 ( -3.85324e-07  3.85279e-07 ) ergs/cm2
 

1-s peak spectrum fit

Power-law model

Time interval is from  110.776 sec. to  111.776 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.43877     ( -0.274083   0.273148 )
Norm@50keV  : 1.36263E-02    ( -0.00232446   0.0023192 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          84.39 using 59 PHA bins.
# Reduced chi-squared =          1.480 for     57 degrees of freedom 
# Null hypothesis probability =   1.068504e-02
 
Photon flux (15-150 keV)    in 1 sec: 1.67464 ( -0.2919  0.29307 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.30686e-07 ( -2.38789e-08  2.41208e-08 ) ergs/cm2
 

Cutoff power-law model

Time interval is from  110.776 sec. to  111.776 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -0.040927     ( -1.24477   1.74979 )
Epeak [keV] : 72.1688      ( -17.4786 142.892 )
Norm@50keV  : 6.58458E-02    ( -0.0658457   0.371917 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          80.61 using 59 PHA bins.
# Reduced chi-squared =          1.440 for     56 degrees of freedom 
# Null hypothesis probability =   1.728846e-02
 
Photon flux (15-150 keV)    in 1 sec: 1.58659 ( -0.30441  0.30443 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.21063e-07 ( -2.31636e-08  2.57552e-08 ) ergs/cm2
 

Time-resolved spectra

Distribution

T90 vs. Hardness ratio plot

T90                                   = 243.596 sec.
Hardness ratio (energy fluence ratio) = 1.245031171

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

S(15-50 keV)  = 1.8492055e-06
S(50-150 keV) = 2.4256932e-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 = -5.948195043325304E-01, IMY = -4.229690919355226E-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:
-239.000000 -73.088000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
299.5815  35.2024    0.5  31.4    7.6   5.1215  24.5    0.4	Cyg X-1                       
308.1455  40.9658    2.0  25.2   -5.7   1.0399   5.8    1.8	Cyg X-3                       
326.2542  38.3108    2.9  29.4  -35.5   0.7551   4.0    3.9	Cyg X-2                       

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

Time interval of the image:
-73.088000 207.956000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
299.5757  35.1883    4.1  31.5    7.6   1.0191   2.8    1.1	Cyg X-1                       
308.0424  41.1090    9.3  25.0   -5.5   0.3796   1.2    9.9	Cyg X-3                       
326.2424  38.2814    7.7  29.5  -35.5  -0.5116  -1.5    4.1	Cyg X-2                       
154.0464  59.4199    2.7  53.1  156.7   7.2125   4.3 ------	UNKNOWN                       
190.3922  71.8460    1.0  36.1  144.6   6.3809  11.4 ------	UNKNOWN                       
268.1817  63.9108    2.5  17.2   94.0   1.5957   4.7 ------	UNKNOWN                       
273.3206  80.9680    2.1  17.4  154.1   1.5377   5.4 ------	UNKNOWN                       
 76.7910  55.5484    2.3  52.1 -153.2   4.5496   5.0 ------	UNKNOWN                       
347.9997  28.1634    2.7  44.7  -59.3   5.0119   4.3 ------	UNKNOWN                       

Post-slew image of 15-350 keV band

Time interval of the image:
672.400620 889.100600
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
 83.6417  22.0106    0.3  36.3 -175.9   8.9418  33.7    0.5	Crab                          
175.4580  77.5871    2.4  37.1   41.4   1.7887   4.8 ------	UNKNOWN                       
 65.6015  68.9937    2.1  12.0    8.4   0.9720   5.5 ------	UNKNOWN                       
346.5268  68.3153    2.2  37.3  -16.4   1.3008   5.2 ------	UNKNOWN                       
311.8444  59.2783    3.2  54.4  -11.5   2.2769   3.6 ------	UNKNOWN                       
 61.8622  31.4956    2.3  27.0 -137.8   1.1368   5.1 ------	UNKNOWN                       
326.4173  54.2878    2.0  53.5  -23.0   3.4928   5.7 ------	UNKNOWN                       
 29.9490  33.7014    4.1  37.3  -89.6   1.7744   2.8 ------	UNKNOWN