GRB180314A: 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: Thu Apr  5 17:33:55 EDT 2018
             Host Name: bat1
   Current Working Dir: /local/data/bat1/alien/Swift_3rdBATcatalog/event/batevent_reproc/trigger814129
======================================================================

  Trigger: 00814129      Segment: 000

  BAT Trigger Time: 542681032   [s; MET]
      Trigger Stop: 542681112   [s; MET]
               UTC: 2018-03-14T00:43:31.380160    [includes UTCF correction] 
       Where From?: TDRSS position message

  BAT 
    RA: 99.2763679701429   Dec: -24.4913623818303  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    24.03
     Image Trigger?:     YES
     Rate S/N Ratio:     0  [ if not an image trigger ]
     Image S/N Ratio:    24.03

  Analysis Position:   [ source = BAT ]
    RA: 99.2763679701429   Dec: -24.4913623818303  [deg; J2000]

  Refined Position:   [ source = BAT pre-slew burst ]
    RA: 99.1732334323054   Dec: -24.4947268784979  [deg; J2000]  
        { 06h 36m 41.6s , -24d 29' 41.0" }
         +/- 4.04925336751762 [arcmin] (estimated 90% radius based on SNR)
         +/- 2.78554184029276 [arcmin] (formal 1-sigma fit error)
    SNR: 4.12515125330775
 
  Angular difference between the analysis and refined position is 5.634835 arcmin
 
  Partial Coding Fraction: 0.2480469    [ including projection effects ]

  Duration
     T90: 50.4640001058578 +/- 21.8358736047547
        Measured from: -9.78400003910065
                   to: 40.6800000667572     [s; relative to TRIGTIME]
     T50: 10.6879999637604 +/- 0.622356892166234
        Measured from: -1.55999994277954
                   to: 9.12800002098083     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: 3.05200004577637     
                   to: 4.05200004577637     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: -11.7999999523163     
                   to: 109.751999974251     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     3.631610   6.073553   5.015320   1.128197
           0.150602   0.162107   0.143499   0.115581 [error]
 Peak      0.167392   0.401908   0.324622   0.030710
           0.018937   0.023833   0.021396   0.012183 [error]

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

======================================================================
 
 
====== Table of the duration information =============================
 
        Value   tstart    tstop
T100  121.552  -11.800  109.752
T90    50.464   -9.784   40.680
T50    10.688   -1.560    9.128
Peak    1.000    3.052    4.052
 
 
====== 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      -1.509    -0.055      0.055       -           -               -         9.54e-03     -3.00e-04          3.00e-04      74.310   57
CPL     -0.841    -0.239      0.252       94.190     -12.251        22.880      1.95e-02     -4.32e-03          5.91e-03      49.420   56
 
 
=== 1-s peak 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      -1.533     -0.101     0.100       -           -               -         6.28e-02     -4.57e-03          4.57e-03      95.550   57
CPL      0.813     -0.615     0.704       62.505      -4.696         5.946      8.98e-01     -4.40e-01          1.03e+00      39.340   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   1.49e-06  2.73e-06  3.84e-06  1.13e-05  1.10e-05  1.94e-05   erg/cm2
      90%_error_low -8.80e-08 -9.78e-08 -1.45e-07 -9.11e-07 -3.61e-07 -1.01e-06   erg/cm2
      90%_error_hi   8.97e-08  9.76e-08  1.45e-07  9.62e-07  3.62e-07  1.04e-06   erg/cm2
Peak flux       PL   2.67e+00  2.63e+00  1.82e+00  1.98e+00  7.91e+00  9.11e+00   ph/cm2/s
      90%_error_low -2.94e-01 -2.02e-01 -1.53e-01 -2.94e-01 -5.87e-01 -6.58e-01   ph/cm2/s
      90%_error_hi   3.03e-01  2.02e-01  1.52e-01  3.17e-01  5.87e-01  6.58e-01   ph/cm2/s
 
Fluence        CPL   1.28e-06  2.86e-06  4.07e-06  5.20e-06  1.06e-05  1.34e-05   erg/cm2
      90%_error_low -1.09e-07 -1.12e-07 -1.70e-07 -1.12e-06 -3.90e-07 -1.17e-06   erg/cm2
      90%_error_hi   1.11e-07  1.12e-07  1.71e-07  1.51e-06  3.90e-07  1.52e-06   erg/cm2
Peak flux      CPL   1.72e+00  3.28e+00  2.36e+00  4.57e-01  7.75e+00  7.81e+00   ph/cm2/s
      90%_error_low -3.39e-01 -2.74e-01 -2.18e-01 -1.51e-01 -5.88e-01 -6.05e-01   ph/cm2/s
      90%_error_hi   3.56e-01  2.78e-01  2.22e-01  1.94e-01  5.91e-01  6.10e-01   ph/cm2/s
 
======================================================================

Image

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

#   RAcent    DECcent   POSerr    Theta     Phi              Peak Cts       SNR   Name
   99.1732   -24.4947   0.0464    42.2874    35.7193        19.1180942      4.125 TRIG_00814129                 
 
Foreground time interval of the image:
-11.800  88.101 (delta_t =  99.901 [sec])
Background time interval of the image:
-12.099 -11.800 (delta_t =   0.299 [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  -11.800 sec. to  109.752 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.50887     ( -0.0547654   0.0547751 )
Norm@50keV  : 9.54089E-03    ( -0.000300451   0.000300444 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          74.31 using 59 PHA bins.
# Reduced chi-squared =          1.304 for     57 degrees of freedom 
# Null hypothesis probability =   6.152088e-02
 
Photon flux (15-150 keV)    in 121.6 sec: 1.19397 ( -0.04111  0.04122 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.09917e-05 ( -3.61415e-07  3.61933e-07 ) ergs/cm2
 

Cutoff power-law model

Time interval is from  -11.800 sec. to  109.752 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -0.840543     ( -0.239058   0.252257 )
Epeak [keV] : 94.1900      ( -12.2507 22.8796 )
Norm@50keV  : 1.95499E-02    ( -0.00432112   0.00590558 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          49.42 using 59 PHA bins.
# Reduced chi-squared =         0.8826 for     56 degrees of freedom 
# Null hypothesis probability =   7.203264e-01
 
Photon flux (15-150 keV)    in 121.6 sec: 1.14839 ( -0.04359  0.04375 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.06046e-05 ( -3.90397e-07  3.89621e-07 ) ergs/cm2
 

1-s peak spectrum fit

Power-law model

Time interval is from    3.052 sec. to    4.052 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.53271     ( -0.101095   0.099945 )
Norm@50keV  : 6.28088E-02    ( -0.00457525   0.00457045 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          95.55 using 59 PHA bins.
# Reduced chi-squared =          1.676 for     57 degrees of freedom 
# Null hypothesis probability =   1.046342e-03
 
Photon flux (15-150 keV)    in 1 sec: 7.91217 ( -0.58686  0.58737 ) ph/cm2/s
Energy fluence (15-150 keV)             : 5.92871e-07 ( -4.52123e-08  4.53484e-08 ) ergs/cm2
 

Cutoff power-law model

Time interval is from    3.052 sec. to    4.052 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 0.813078     ( -0.615479   0.703763 )
Epeak [keV] : 62.5052      ( -4.69576 5.94635 )
Norm@50keV  : 0.897858    ( -0.440297   1.0349 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          39.34 using 59 PHA bins.
# Reduced chi-squared =         0.7024 for     56 degrees of freedom 
# Null hypothesis probability =   9.554803e-01
 
Photon flux (15-150 keV)    in 1 sec: 7.74953 ( -0.58788  0.59062 ) ph/cm2/s
Energy fluence (15-150 keV)             : 5.78189e-07 ( -4.59705e-08  4.63219e-08 ) ergs/cm2
 

Time-resolved spectra

Distribution

T90 vs. Hardness ratio plot

T90                                   = 50.464 sec.
Hardness ratio (energy fluence ratio) = 1.42059378168

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

S(15-50 keV)  = 4.146311e-06
S(50-150 keV) = 6.458413e-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 = 7.384328718997748E-01, IMY = -5.309956329835059E-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:
-12.099400 -11.800000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
170.5756 -60.7101    5.6  41.8  131.5   0.0429   2.1    9.3	Cen X-3                       
186.5926 -62.7290    4.2  45.0  141.9  -0.0599  -2.7    3.0	GX 301-2                      
 78.5746  -6.2919    2.2  57.0    5.6   0.1914   5.2 ------	UNKNOWN                       
 68.6706  -4.9387    2.6  58.2   -6.1   0.1605   4.5 ------	UNKNOWN                       
 55.9765 -42.3872    2.0  22.8  -34.3   0.0396   5.9 ------	UNKNOWN                       
 57.0782 -18.4825    1.8  45.8  -22.2   0.0730   6.3 ------	UNKNOWN                       
298.5713 -56.9241    2.8  54.8 -153.0   0.1080   4.1 ------	UNKNOWN                       

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

Time interval of the image:
-11.800000 88.100610
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
170.1997 -60.5559    5.8  41.8  131.5 -13.5682  -2.0    5.3	Cen X-3                       
186.2248 -62.6667    0.0  45.0  142.0  19.9768   2.8   13.4	GX 301-2                      
130.6763 -62.0995    2.5  25.9  113.1  13.5505   4.7 ------	UNKNOWN                       
218.2034 -63.2708    2.5  51.2  159.5  44.0158   4.7 ------	UNKNOWN                       
 64.0500 -22.4571    2.0  40.9  -13.6  17.6751   5.8 ------	UNKNOWN                       

Post-slew image of 15-350 keV band

Time interval of the image:
148.300590 963.175900
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
 83.6187  22.0244    0.4  48.9  -10.2  30.2758  26.6    1.0	Crab                          
135.5016 -40.5340   80.6  34.2  136.0  -0.1439  -0.1    1.7	Vela X-1                      
137.9006 -23.2342    4.5  35.2  105.2   3.7413   2.6 ------	UNKNOWN                       
 87.6550 -74.7010    2.8  50.6 -167.0   6.8499   4.1 ------	UNKNOWN                       
 86.0645 -81.8923    3.1  57.6 -168.7  14.7145   3.7 ------	UNKNOWN                       
 79.7470  -7.7627    2.5  25.1  -42.3   3.2353   4.6 ------	UNKNOWN                       
 67.4447  -0.7009    2.8  38.9  -48.0   4.5014   4.2 ------	UNKNOWN                       
 64.5806  10.0280    3.4  48.3  -39.5   6.4086   3.4 ------	UNKNOWN                       
 62.5381   7.0060    3.7  47.7  -44.3   6.7014   3.1 ------	UNKNOWN                       
 61.3456  13.0631    2.4  52.7  -39.7  13.5007   4.7 ------	UNKNOWN                       
 46.2448 -52.4532    2.8  48.5 -130.4  13.1996   4.2 ------	UNKNOWN                       
 48.8511 -45.1888    2.8  45.3 -121.1  10.7865   4.1 ------	UNKNOWN