GRB180329A: 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 May 30 16:01:48 EDT 2018
             Host Name: bat1
   Current Working Dir: /local/data/bat1/alien/Swift_3rdBATcatalog/event/batevent_reproc/trigger819301
======================================================================

  Trigger: 00819301      Segment: 000

  BAT Trigger Time: 543977901.504   [s; MET]
      Trigger Stop: 543977909.696   [s; MET]
               UTC: 2018-03-29T00:58:00.805800    [includes UTCF correction] 
       Where From?: TDRSS position message

  BAT 
    RA: 329.297998471192   Dec: -15.0707756964668  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    6.9
     Image Trigger?:     NO
     Rate S/N Ratio:     9.59166304662544  [ if not an image trigger ]
     Image S/N Ratio:    6.9

  Analysis Position:   [ source = BAT ]
    RA: 329.297998471192   Dec: -15.0707756964668  [deg; J2000]

  Refined Position:   [ source = BAT pre-slew burst ]
    RA: 329.296632171678   Dec: -15.1056178798433  [deg; J2000]  
        { 21h 57m 11.2s , -15d 06' 20.2" }
         +/- 2.49942751046552 [arcmin] (estimated 90% radius based on SNR)
         +/- 1.29312659436897 [arcmin] (formal 1-sigma fit error)
    SNR: 8.21816285739399
 
  Angular difference between the analysis and refined position is 2.092029 arcmin
 
  Partial Coding Fraction: 0.8125    [ including projection effects ]

  Duration
     T90: 36 +/- 7.28010988928052
        Measured from: -0.503999948501587
                   to: 35.4960000514984     [s; relative to TRIGTIME]
     T50: 19 +/- 11.1803398874989
        Measured from: 2.49600005149841
                   to: 21.4960000514984     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: 0.496000051498413     
                   to: 1.49600005149841     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: -0.503999948501587     
                   to: 39.4960000514984     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     0.232054   0.205690   0.119308   0.023484
           0.040123   0.041141   0.035310   0.029233 [error]
 Peak      0.029043   0.001151   0.023561   0.006947
           0.006402   0.006748   0.006034   0.004835 [error]

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

======================================================================
 
 
====== Table of the duration information =============================
 
        Value   tstart    tstop
T100   40.000   -0.504   39.496
T90    36.000   -0.504   35.496
T50    19.000    2.496   21.496
Peak    1.000    0.496    1.496
 
 
====== 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    -0.382      0.344       -           -               -         8.73e-04     -2.20e-04          2.11e-04      42.810   57
CPL     -1.064    -1.220      1.935       48.313      N/A           N/A         2.60e-03        N/A               N/A         41.830   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      -0.997     -0.844     0.948       -           -               -         3.77e-03     -1.57e-03          1.31e-03      64.020   57
CPL     -1.049     -0.797     1.177     9999.360    -9999.360      -9999.360      3.82e-03        N/A               N/A         64.060   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   6.49e-08  9.36e-08  1.00e-07  2.01e-07  3.21e-07  4.60e-07   erg/cm2
      90%_error_low -1.72e-08 -1.86e-08 -3.30e-08 -1.05e-07 -7.68e-08 -1.48e-07   erg/cm2
      90%_error_hi   1.79e-08  1.85e-08  3.41e-08  1.61e-07  7.98e-08  1.92e-07   erg/cm2
Peak flux       PL   9.56e-02  1.30e-01  1.31e-01  2.39e-01  4.34e-01  5.95e-01   ph/cm2/s
      90%_error_low -7.14e-02 -7.30e-02 -5.42e-02 -1.72e-01 -1.63e-01 -2.12e-01   ph/cm2/s
      90%_error_hi   1.06e-01  6.34e-02  4.65e-02  3.56e-01  1.62e-01  2.64e-01   ph/cm2/s
 
Fluence        CPL   6.01e-08  1.04e-07  9.91e-08  5.74e-08  3.00e-07  3.21e-07   erg/cm2
      90%_error_low -2.04e-08 -2.17e-08 -3.91e-08 -5.07e-08 -7.73e-08 -9.65e-08   erg/cm2
      90%_error_hi   1.99e-08  2.67e-08  3.79e-08  1.83e-07  8.68e-08  2.06e-07   erg/cm2
Peak flux      CPL     N/A      N/A      N/A      N/A      N/A      N/A     ph/cm2/s
      90%_error_low -7.14e-02 -7.30e-02 -5.42e-02 -1.72e-01 -1.63e-01 -2.12e-01   ph/cm2/s
      90%_error_hi   1.06e-01  6.34e-02  4.65e-02  3.56e-01  1.62e-01  2.64e-01   ph/cm2/s
 
======================================================================

Image

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

#   RAcent    DECcent   POSerr    Theta     Phi              Peak Cts       SNR   Name
  329.2966   -15.1056   0.0235    23.1353   -48.1885         0.6218219      8.218 TRIG_00819301                 
 
Foreground time interval of the image:
 -0.504  39.496 (delta_t =  40.000 [sec])
Background time interval of the image:
-239.504  -0.504 (delta_t = 239.000 [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   -0.504 sec. to   39.496 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.89774     ( -0.381705   0.343775 )
Norm@50keV  : 8.72934E-04    ( -0.000219859   0.000211032 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          42.81 using 59 PHA bins.
# Reduced chi-squared =         0.7510 for     57 degrees of freedom 
# Null hypothesis probability =   9.185110e-01
 
Photon flux (15-150 keV)    in 40 sec: 0.125163 ( -0.024613  0.024613 ) ph/cm2/s
Energy fluence (15-150 keV)             : 3.2107e-07 ( -7.68056e-08  7.97504e-08 ) ergs/cm2
 

Cutoff power-law model

Time interval is from   -0.504 sec. to   39.496 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.06359     ( -1.22045   1.93535 )
Epeak [keV] : 48.3132      (   )
Norm@50keV  : 2.60101E-03    (     )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          41.83 using 59 PHA bins.
# Reduced chi-squared =         0.7469 for     56 degrees of freedom 
# Null hypothesis probability =   9.204591e-01
 
Photon flux (15-150 keV)    in 40 sec: 0.122164 ( -0.0250855  0.025115 ) ph/cm2/s
Energy fluence (15-150 keV)             : 2.99509e-07 ( -7.72756e-08  8.68488e-08 ) ergs/cm2
 

1-s peak spectrum fit

Power-law model

Time interval is from    0.496 sec. to    1.496 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -0.99674     ( -0.846271   0.945271 )
Norm@50keV  : 3.77292E-03    ( -0.00157285   0.00131531 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          64.02 using 59 PHA bins.
# Reduced chi-squared =          1.123 for     57 degrees of freedom 
# Null hypothesis probability =   2.436615e-01
 
Photon flux (15-150 keV)    in 1 sec: 0.433911 ( -0.162848  0.162363 ) ph/cm2/s
Energy fluence (15-150 keV)             : 4.08846e-08 ( -1.53676e-08  1.501e-08 ) ergs/cm2
 

Cutoff power-law model

Time interval is from    0.496 sec. to    1.496 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -0.998506     ( -0.799157   1.17462 )
Epeak [keV] : 1.00000E+04      ( -10000 -10000 )
Norm@50keV  : 3.79667E-03    (     )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          64.04 using 59 PHA bins.
# Reduced chi-squared =          1.144 for     56 degrees of freedom 
# Null hypothesis probability =   2.151987e-01
 
Photon flux (15-150 keV)    in 1 sec:  (    ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.23575e-08 ( 0  0 ) ergs/cm2
 

Time-resolved spectra

Distribution

T90 vs. Hardness ratio plot

T90                                   = 36.0 sec.
Hardness ratio (energy fluence ratio) = 1.07349472359

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

S(15-50 keV)  = 1.584446e-07
S(50-150 keV) = 1.626255e-07

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 = 2.848493244959475E-01, IMY = 3.184577990928796E-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:
-239.504000 -0.504000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
273.9977 -14.0885   13.5  40.1   66.7  -1.5418  -0.8    3.2	GX 17+2                       
276.0729 -30.4943    4.2  45.8   43.9  -4.4142  -2.7   10.8	H1820-303                     
285.0360 -24.9205 2700.0  36.2   43.2  -0.0005  -0.0    0.0	HT1900.1-2455                 
288.7148  10.9219    1.8  25.3  114.9   3.3431   6.3    5.1	GRS 1915+105                  
299.5858  35.2041    1.1  36.7  162.5   5.8794  10.1    0.3	Cyg X-1                       
307.9628  40.9547 2700.0  40.8  174.9   0.0010   0.0    6.7	Cyg X-3                       
326.1125  38.3611    6.4  40.3 -163.3   0.8958   1.8    3.7	Cyg X-2                       
275.0826   7.1837    0.5  37.3  100.8  34.6773  23.8 ------	UNKNOWN                       
337.2062 -55.6681    4.3  59.6  -16.9   4.9553   2.7 ------	UNKNOWN                       
352.6176   1.2571    2.6  40.8  -92.3   5.2772   4.5  449.3	UNKNOWN                       
352.9959  27.7661    2.7  48.0 -129.1   5.9014   4.2 ------	UNKNOWN                       

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

Time interval of the image:
-0.504000 39.496000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
273.8572 -13.8841    0.0  40.2   67.1   0.9387   3.0   12.6	GX 17+2                       
275.9278 -30.3688  107.6  45.9   44.1   0.0349   0.1    0.2	H1820-303                     
285.1844 -25.0124    5.2  36.1   42.9  -0.3394  -2.2    9.8	HT1900.1-2455                 
288.8161  11.0854    3.6  25.3  115.4  -0.3553  -3.3    8.5	GRS 1915+105                  
299.6301  35.2576   12.8  36.8  162.6  -0.1052  -0.9    3.9	Cyg X-1                       
308.0701  40.9307    4.4  40.8  175.0   0.3601   2.6    2.2	Cyg X-3                       
326.3067  38.2681    9.1  40.2 -163.0   0.1473   1.3    7.1	Cyg X-2                       
277.8713  31.1553    2.7  44.6  136.4   1.3756   4.2 ------	UNKNOWN                       
329.2966 -15.1058    1.4  23.1  -48.2   0.6217   8.2 ------	UNKNOWN                       
342.7921 -28.4462    1.8  41.3  -44.0   0.7754   6.3 ------	UNKNOWN                       

Post-slew image of 15-350 keV band

Time interval of the image:
546.796590 778.279400
779.496000 939.196600
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
 83.6411  21.9998    0.4  37.6  167.5  14.8735  28.1    1.0	Crab                          
 62.7865  67.5427    2.9  13.8   38.2   1.2818   4.0 ------	UNKNOWN                       
335.4271  75.8857    2.9  36.5    5.7   1.8113   4.0 ------	UNKNOWN                       
 44.2155   5.4491    3.7  49.7 -133.0   5.8015   3.1 ------	UNKNOWN