GRB180329B: 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 15:59:15 EDT 2018
             Host Name: bat1
   Current Working Dir: /local/data/bat1/alien/Swift_3rdBATcatalog/event/batevent_reproc/trigger819490
======================================================================

  Trigger: 00819490      Segment: 000

  BAT Trigger Time: 544025324.672   [s; MET]
      Trigger Stop: 544025328.768   [s; MET]
               UTC: 2018-03-29T14:08:23.970940    [includes UTCF correction] 
       Where From?: TDRSS position message

  BAT 
    RA: 82.9163701340642   Dec: -23.7077603611066  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    6.87
     Image Trigger?:     NO
     Rate S/N Ratio:     10.9087121146357  [ if not an image trigger ]
     Image S/N Ratio:    6.87

  Analysis Position:   [ source = BAT ]
    RA: 82.9163701340642   Dec: -23.7077603611066  [deg; J2000]

  Refined Position:   [ source = BAT pre-slew burst ]
    RA: 82.9050662305339   Dec: -23.6948034233854  [deg; J2000]  
        { 05h 31m 37.2s , -23d 41' 41.3" }
         +/- 1.76319016577187 [arcmin] (estimated 90% radius based on SNR)
         +/- 0.830056747870182 [arcmin] (formal 1-sigma fit error)
    SNR: 13.5288986841124
 
  Angular difference between the analysis and refined position is 0.995013 arcmin
 
  Partial Coding Fraction: 0.15625    [ including projection effects ]

  Duration
     T90: 213.536000013351 +/- 49.4225729811666
        Measured from: -5.59200000762939
                   to: 207.944000005722     [s; relative to TRIGTIME]
     T50: 144.111999988556 +/- 3.45922998158195
        Measured from: 4.50399994850159
                   to: 148.615999937057     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: 1.56399989128113     
                   to: 2.56399989128113     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: -9.91200006008148     
                   to: 257.159999966621     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     2.015813   2.559963   1.466491  -0.003475
           0.144241   0.149383   0.127417   0.107463 [error]
 Peak      0.063057   0.051293   0.061948   0.014496
           0.016552   0.017991   0.015675   0.011478 [error]

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

======================================================================
 
 
====== Table of the duration information =============================
 
        Value   tstart    tstop
T100  267.072   -9.912  257.160
T90   213.536   -5.592  207.944
T50   144.112    4.504  148.616
Peak    1.000    1.564    2.564
 
 
====== 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: CPL)
 
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      -1.877    -0.126      0.123       -           -               -         1.41e-03     -1.15e-04          1.14e-04      65.310   57
CPL     -0.897    -0.530      0.601       50.135      -7.291        12.133      4.89e-03     -2.35e-03          5.50e-03      54.310   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      -1.912     -0.637     0.522       -           -               -         9.88e-03     -3.93e-03          3.56e-03      58.840   57
CPL     -1.888     -0.966     1.721      212.647      N/A           N/A         1.02e-02        N/A               N/A         58.850   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   6.88e-07  1.01e-06  1.09e-06  2.23e-06  3.47e-06  5.02e-06   erg/cm2
      90%_error_low -7.09e-08 -7.07e-08 -1.19e-07 -4.52e-07 -2.80e-07 -5.84e-07   erg/cm2
      90%_error_hi   7.26e-08  7.08e-08  1.20e-07  5.21e-07  2.83e-07  6.35e-07   erg/cm2
Peak flux       PL   6.05e-01  4.78e-01  2.54e-01  1.96e-01  1.43e+00  1.53e+00   ph/cm2/s
      90%_error_low -2.47e-01 -1.43e-01 -1.25e-01 -1.37e-01 -4.25e-01 -4.65e-01   ph/cm2/s
      90%_error_hi   2.62e-01  1.43e-01  1.23e-01  2.32e-01  4.25e-01  4.69e-01   ph/cm2/s
 
Fluence        CPL   6.13e-07  1.12e-06  1.09e-06  5.84e-07  3.21e-06  3.41e-06   erg/cm2
      90%_error_low -8.26e-08 -9.33e-08 -1.40e-07 -2.82e-07 -2.98e-07 -4.13e-07   erg/cm2
      90%_error_hi   8.32e-08  9.55e-08  1.37e-07  5.47e-07  3.07e-07  6.06e-07   erg/cm2
Peak flux      CPL   6.22e-01  4.69e-01  2.50e-01  2.10e-01  1.42e+00  1.53e+00   ph/cm2/s
      90%_error_low     N/A   -2.31e-01 -1.20e-01 -1.33e-01 -6.99e-01 -4.66e-01   ph/cm2/s
      90%_error_hi      N/A    1.82e-01  7.11e-02  5.72e-02  4.29e-01  4.63e-01   ph/cm2/s
 
======================================================================

Image

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

#   RAcent    DECcent   POSerr    Theta     Phi              Peak Cts       SNR   Name
   82.9051   -23.6948   0.0142    38.5349  -104.8249         3.0996897     13.529 TRIG_00819490                 
 
Foreground time interval of the image:
 -9.912  35.629 (delta_t =  45.541 [sec])
Background time interval of the image:
-239.672  -9.912 (delta_t = 229.760 [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   -9.912 sec. to  257.160 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.87738     ( -0.126093   0.122615 )
Norm@50keV  : 1.41453E-03    ( -0.000115299   0.00011404 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          65.31 using 59 PHA bins.
# Reduced chi-squared =          1.146 for     57 degrees of freedom 
# Null hypothesis probability =   2.102736e-01
 
Photon flux (15-150 keV)    in 267.1 sec: 0.201091 ( -0.014329  0.014338 ) ph/cm2/s
Energy fluence (15-150 keV)             : 3.47388e-06 ( -2.8003e-07  2.83062e-07 ) ergs/cm2
 

Cutoff power-law model

Time interval is from   -9.912 sec. to  257.160 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -0.89689     ( -0.529919   0.600785 )
Epeak [keV] : 50.1352      ( -7.29119 12.1333 )
Norm@50keV  : 4.89185E-03    ( -0.00235378   0.00549502 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          54.31 using 59 PHA bins.
# Reduced chi-squared =         0.9698 for     56 degrees of freedom 
# Null hypothesis probability =   5.391783e-01
 
Photon flux (15-150 keV)    in 267.1 sec: 0.193435 ( -0.014831  0.014848 ) ph/cm2/s
Energy fluence (15-150 keV)             : 3.21206e-06 ( -2.97766e-07  3.07053e-07 ) ergs/cm2
 

1-s peak spectrum fit

Power-law model

Time interval is from    1.564 sec. to    2.564 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.91187     ( -0.636509   0.521688 )
Norm@50keV  : 9.88488E-03    ( -0.00392955   0.00355764 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          58.84 using 59 PHA bins.
# Reduced chi-squared =          1.032 for     57 degrees of freedom 
# Null hypothesis probability =   4.079551e-01
 
Photon flux (15-150 keV)    in 1 sec: 1.42588 ( -0.42526  0.42525 ) ph/cm2/s
Energy fluence (15-150 keV)             : 9.09055e-08 ( -3.29092e-08  3.38156e-08 ) ergs/cm2
 

Cutoff power-law model

Time interval is from    1.564 sec. to    2.564 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.88843     ( -0.951249   1.73557 )
Epeak [keV] : 212.647      (   )
Norm@50keV  : 1.01549E-02    (     )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          58.84 using 59 PHA bins.
# Reduced chi-squared =          1.051 for     56 degrees of freedom 
# Null hypothesis probability =   3.717839e-01
 
Photon flux (15-150 keV)    in 1 sec: 1.42220 ( -0.699479  0.42895 ) ph/cm2/s
Energy fluence (15-150 keV)             : 0 ( 0  0 ) ergs/cm2
 

Time-resolved spectra

Distribution

T90 vs. Hardness ratio plot

T90                                   = 213.536 sec.
Hardness ratio (energy fluence ratio) = 0.974092118497

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

S(15-50 keV)  = 1.7348698e-06
S(50-150 keV) = 1.4771663e-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 = -2.037799709813925E-01, IMY = 7.699208746149095E-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:
-239.672000 -9.912000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
 83.6273  22.0139    1.1  49.9  -38.9   7.4269  11.0    0.3	Crab                          
135.5308 -40.5748    2.3  31.7  168.4   1.2620   5.0    1.2	Vela X-1                      
 93.8875 -27.1514    3.3  30.2 -116.3   0.9604   3.5 ------	UNKNOWN                       
 79.7215 -15.7477    3.3  40.7  -91.9   3.2498   3.5 ------	UNKNOWN                       
 79.6753  -7.5188    2.9  41.3  -79.4   3.2329   4.0 ------	UNKNOWN                       

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

Time interval of the image:
-9.912000 35.628590
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
 83.5520  21.9614    5.7  49.9  -39.0   0.5478   2.0    5.5	Crab                          
135.6066 -40.5517    5.5  31.7  168.2   0.2169   2.1    3.6	Vela X-1                      
115.6706  37.2019    2.7  48.9    3.0   0.7546   4.3 ------	UNKNOWN                       
 82.9066 -23.6960    0.9  38.5 -104.8   3.1072  13.6 ------	UNKNOWN                       

Post-slew image of 15-350 keV band

Time interval of the image:
93.028590 962.448000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
 83.6377  22.0226    0.3  45.7   -8.4  34.0352  34.7    0.5	Crab                          
 49.0902 -66.5127    2.7  47.8 -171.8   5.7780   4.3 ------	UNKNOWN                       
 74.7483  35.3785    3.6  59.6  -17.0  10.5735   3.2 ------	UNKNOWN                       
 67.0108  18.6457    3.9  45.1  -30.8   2.9293   3.0 ------	UNKNOWN                       
 28.6339 -37.3916    3.3  48.1 -129.1  10.0603   3.4 ------	UNKNOWN