GRB180410A: 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 May 11 18:13:07 EDT 2018
             Host Name: bat1
   Current Working Dir: /local/data/bat1/alien/Swift_3rdBATcatalog/event/batevent_reproc/trigger824063
======================================================================

  Trigger: 00824063      Segment: 000

  BAT Trigger Time: 545040200   [s; MET]
      Trigger Stop: 545040296   [s; MET]
               UTC: 2018-04-10T08:02:59.237600    [includes UTCF correction] 
       Where From?: TDRSS position message

  BAT 
    RA: 95.981565817236   Dec: 12.8078803516501  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    10.52
     Image Trigger?:     YES
     Rate S/N Ratio:     0  [ if not an image trigger ]
     Image S/N Ratio:    10.52

  Analysis Position:   [ source = BAT ]
    RA: 95.981565817236   Dec: 12.8078803516501  [deg; J2000]

  Refined Position:   [ source = BAT pre-slew burst ]
    RA: 95.9714996106793   Dec: 12.8062630733419  [deg; J2000]  
        { 06h 23m 53.2s , +12d 48' 22.5" }
         +/- 1.83821515799834 [arcmin] (estimated 90% radius based on SNR)
         +/- 0.735250936209581 [arcmin] (formal 1-sigma fit error)
    SNR: 12.7470391179459
 
  Angular difference between the analysis and refined position is 0.596887 arcmin
 
  Partial Coding Fraction: 0.53125    [ including projection effects ]

  Duration
     T90: 114.799999952316 +/- 14.4293076043345
        Measured from: 25.6879999637604
                   to: 140.487999916077     [s; relative to TRIGTIME]
     T50: 50.2719999551773 +/- 10.1099760924878
        Measured from: 37.9119999408722
                   to: 88.1839998960495     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: 25.7039999961853     
                   to: 26.7039999961853     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: 20.7120000123978     
                   to: 154.751999974251     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     0.849995   1.226270   1.203924   0.191441
           0.087169   0.090106   0.076698   0.063939 [error]
 Peak      0.008085   0.030000   0.039674   0.013972
           0.007899   0.008594   0.007933   0.006422 [error]

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

======================================================================
 
 
====== Table of the duration information =============================
 
        Value   tstart    tstop
T100  134.040   20.712  154.752
T90   114.800   25.688  140.488
T50    50.272   37.912   88.184
Peak    1.000   25.704   26.704
 
 
====== 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      -1.399    -0.125      0.125       -           -               -         1.85e-03     -1.32e-04          1.32e-04      50.110   57
CPL     -0.942    -0.497      0.580      122.827     -41.527      -122.827      3.06e-03     -1.26e-03          2.61e-03      47.810   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      -0.795     -0.422     0.488       -           -               -         6.29e-03     -1.82e-03          1.74e-03      69.710   57
CPL      0.289     -1.283     3.293      126.197     -56.102      -126.197      1.81e-02     -1.81e-02          3.24e-01      68.790   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   2.87e-07  5.61e-07  8.52e-07  2.81e-06  2.39e-06  4.51e-06   erg/cm2
      90%_error_low -3.71e-08 -4.47e-08 -7.50e-08 -5.07e-07 -1.85e-07 -5.63e-07   erg/cm2
      90%_error_hi   3.86e-08  4.44e-08  7.46e-08  5.79e-07  1.86e-07  6.21e-07   erg/cm2
Peak flux       PL   1.32e-01  2.03e-01  2.34e-01  5.18e-01  7.23e-01  1.09e+00   ph/cm2/s
      90%_error_low -6.88e-02 -7.53e-02 -5.99e-02 -2.30e-01 -1.96e-01 -2.91e-01   ph/cm2/s
      90%_error_hi   8.70e-02  7.48e-02  5.97e-02  3.40e-01  2.00e-01  3.19e-01   ph/cm2/s
 
Fluence        CPL   2.62e-07  5.84e-07  8.85e-07  1.53e-06  2.32e-06  3.26e-06   erg/cm2
      90%_error_low -4.66e-08 -5.18e-08 -8.45e-08 -7.00e-07 -2.02e-07 -7.19e-07   erg/cm2
      90%_error_hi   4.75e-08  5.30e-08  8.64e-08  1.32e-06  2.01e-07  1.94e-06   erg/cm2
Peak flux      CPL   9.66e-02  2.11e-01  2.66e-01  2.21e-01  6.98e-01  7.94e-01   ph/cm2/s
      90%_error_low -9.66e-02 -8.67e-02 -7.98e-02 -2.21e-01 -2.00e-01 -2.77e-01   ph/cm2/s
      90%_error_hi   1.05e-01  8.73e-02  8.44e-02  2.85e-01  2.04e-01  4.62e-01   ph/cm2/s
 
======================================================================

Image

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

#   RAcent    DECcent   POSerr    Theta     Phi              Peak Cts       SNR   Name
   95.9715    12.8063   0.0151    33.5944   155.9414         3.1846240     12.747 TRIG_00824063                 
 
Foreground time interval of the image:
 20.712 105.301 (delta_t =  84.589 [sec])
Background time interval of the image:
-15.899  20.712 (delta_t =  36.611 [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   20.712 sec. to  154.752 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.39874     ( -0.124602   0.125062 )
Norm@50keV  : 1.84512E-03    ( -0.000132125   0.000132033 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          50.11 using 59 PHA bins.
# Reduced chi-squared =         0.8791 for     57 degrees of freedom 
# Null hypothesis probability =   7.292438e-01
 
Photon flux (15-150 keV)    in 134 sec: 0.224641 ( -0.016822  0.016862 ) ph/cm2/s
Energy fluence (15-150 keV)             : 2.38998e-06 ( -1.85105e-07  1.8607e-07 ) ergs/cm2
 

Cutoff power-law model

Time interval is from   20.712 sec. to  154.752 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -0.942267     ( -0.497272   0.580261 )
Epeak [keV] : 122.827      ( -41.5261 -122.826 )
Norm@50keV  : 3.05502E-03    ( -0.00125559   0.00261085 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          47.81 using 59 PHA bins.
# Reduced chi-squared =         0.8537 for     56 degrees of freedom 
# Null hypothesis probability =   7.738346e-01
 
Photon flux (15-150 keV)    in 134 sec: 0.219688 ( -0.017819  0.017746 ) ph/cm2/s
Energy fluence (15-150 keV)             : 2.32308e-06 ( -2.01911e-07  2.0136e-07 ) ergs/cm2
 

1-s peak spectrum fit

Power-law model

Time interval is from   25.704 sec. to   26.704 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -0.795291     ( -0.422012   0.487892 )
Norm@50keV  : 6.29325E-03    ( -0.00181609   0.00174449 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          69.71 using 59 PHA bins.
# Reduced chi-squared =          1.223 for     57 degrees of freedom 
# Null hypothesis probability =   1.204065e-01
 
Photon flux (15-150 keV)    in 1 sec: 0.723419 ( -0.196311  0.199705 ) ph/cm2/s
Energy fluence (15-150 keV)             : 7.36953e-08 ( -1.91358e-08  1.92313e-08 ) ergs/cm2
 

Cutoff power-law model

Time interval is from   25.704 sec. to   26.704 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 0.288678     ( -1.28263   3.29278 )
Epeak [keV] : 126.197      ( -56.1118 -126.207 )
Norm@50keV  : 1.81383E-02    ( -0.0181351   0.324032 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          68.79 using 59 PHA bins.
# Reduced chi-squared =          1.228 for     56 degrees of freedom 
# Null hypothesis probability =   1.171652e-01
 
Photon flux (15-150 keV)    in 1 sec: 0.698419 ( -0.20041  0.204387 ) ph/cm2/s
Energy fluence (15-150 keV)             : 7.07115e-08 ( -2.14248e-08  2.04098e-08 ) ergs/cm2
 

Time-resolved spectra

Distribution

T90 vs. Hardness ratio plot

T90                                   = 114.8 sec.
Hardness ratio (energy fluence ratio) = 1.51708525106

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

S(15-50 keV)  = 8.48505e-07
S(50-150 keV) = 1.5414718e-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 = -6.065525978282925E-01, IMY = -2.707984011356575E-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:
-15.899400 20.712000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
 83.6444  22.0098    0.5  20.4  171.7   1.5136  22.0    0.7	Crab                          
 75.6678  -7.2280    2.3  48.4 -166.1   0.7624   5.1 ------	UNKNOWN                       

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

Time interval of the image:
20.712000 105.300590
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
 83.6520  22.1700    5.6  20.2  171.6   0.3545   2.1    9.4	Crab                          
158.6722  70.3595    2.0  49.5   40.4   4.6475   5.7 ------	UNKNOWN                       
 95.9715  12.8063    0.9  33.6  155.9   3.1843  12.7 ------	UNKNOWN                       

Post-slew image of 15-350 keV band

Time interval of the image:
159.500610 963.090000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
 83.6314  22.0156    0.2  14.9  -55.2  34.0387  50.5    0.1	Crab                          
110.3803 -39.6390    2.5  54.2  161.4  16.1500   4.5 ------	UNKNOWN                       
 79.3575 -42.9600    2.8  57.8 -170.6  14.2879   4.1 ------	UNKNOWN                       
 82.3868  64.0425    4.5  52.1  -12.4   3.9923   2.6 ------	UNKNOWN                       
 67.2071  50.9094    3.1  44.7  -30.5   4.2165   3.8 ------	UNKNOWN                       
 69.8407 -39.0271    2.3  57.3 -160.9  16.8344   5.1 ------	UNKNOWN                       
 54.8982  21.3705    2.8  40.1  -76.9   9.6317   4.1 ------	UNKNOWN                       
 55.6091  -5.0222    2.2  43.9 -116.4  13.6272   5.3 ------	UNKNOWN