GRB160313A: 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: Mon Mar 28 14:22:03 EDT 2016
             Host Name: bat1
   Current Working Dir: /local/data/bat1/alien/Swift_3rdBATcatalog/event/batevent_reproc/trigger678929
======================================================================

  Trigger: 00678929      Segment: 000

  BAT Trigger Time: 479529451.776   [s; MET]
      Trigger Stop: 479529478.656   [s; MET]
               UTC: 2016-03-13T02:37:15.804900    [includes UTCF correction] 
       Where From?: TDRSS position message

  BAT 
    RA: 183.787873774764   Dec: 57.2928358615757  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    8.71
     Image Trigger?:     NO
     Rate S/N Ratio:     9.89949493661167  [ if not an image trigger ]
     Image S/N Ratio:    8.71

  Analysis Position:   [ source = BAT ]
    RA: 183.787873774764   Dec: 57.2928358615757  [deg; J2000]

  Refined Position:   [ source = BAT pre-slew burst ]
    RA: 183.819620681679   Dec: 57.2799178763181  [deg; J2000]  
        { 12h 15m 16.7s , +57d 16' 47.7" }
         +/- 2.00346933649191 [arcmin] (estimated 90% radius based on SNR)
         +/- 0.93537714587284 [arcmin] (formal 1-sigma fit error)
    SNR: 11.2719807218026
 
  Angular difference between the analysis and refined position is 1.288601 arcmin
 
  Partial Coding Fraction: 0.8046875    [ including projection effects ]

  Duration
     T90: 41.5359999537468 +/- 6.18321240663874
        Measured from: -1.45200002193451
                   to: 40.0839999318123     [s; relative to TRIGTIME]
     T50: 22.3679999709129 +/- 5.97979697204795
        Measured from: 5.83199995756149
                   to: 28.1999999284744     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: 24.7919999957085     
                   to: 25.7919999957085     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: -5.60400003194809     
                   to: 44.6559999585152     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     0.268840   0.269509   0.329309   0.083141
           0.038766   0.040436   0.034956   0.029407 [error]
 Peak      0.013690   0.019137   0.010443   0.009083
           0.005538   0.005901   0.004941   0.004190 [error]

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

======================================================================
 
 
====== Table of the duration information =============================
 
        Value   tstart    tstop
T100   50.260   -5.604   44.656
T90    41.536   -1.452   40.084
T50    22.368    5.832   28.200
Peak    1.000   24.792   25.792
 
 
====== 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: 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      -1.304    -0.234      0.235       -           -               -         1.20e-03     -1.52e-04          1.51e-04      75.620   57
CPL     -1.305    -0.230      0.637     9999.320    -9999.320      -9999.320      1.21e-03     -1.21e-03          1.07e-03      75.630   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      -1.690     -0.798     0.703       -           -               -         2.68e-03     -1.22e-03          1.11e-03      69.010   57
CPL     -1.694     -1.108     1.043     9999.140    -9999.130      -9999.140      2.67e-03        N/A               N/A         69.010   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   6.43e-08  1.33e-07  2.16e-07  7.85e-07  5.97e-07  1.20e-06   erg/cm2
      90%_error_low -1.49e-08 -1.89e-08 -3.47e-08 -2.50e-07 -8.47e-08 -2.77e-07   erg/cm2
      90%_error_hi   1.59e-08  1.85e-08  3.41e-08  3.23e-07  8.55e-08  3.39e-07   erg/cm2
Peak flux       PL   1.33e-01  1.19e-01  7.39e-02  6.97e-02  3.55e-01  3.95e-01   ph/cm2/s
      90%_error_low -7.20e-02 -4.48e-02 -4.13e-02 -6.97e-02 -1.32e-01 -1.50e-01   ph/cm2/s
      90%_error_hi   7.99e-02  4.44e-02  4.14e-02  1.12e-01  1.32e-01  1.54e-01   ph/cm2/s
 
Fluence        CPL   6.54e-08  1.32e-07  2.14e-07  8.44e-07  6.00e-07  1.15e-06   erg/cm2
      90%_error_low -1.92e-08    N/A    -3.87e-08 -5.15e-07 -1.03e-07 -4.23e-07   erg/cm2
      90%_error_hi   1.70e-08    N/A     4.32e-08  9.30e-08  9.77e-08  3.69e-07   erg/cm2
Peak flux      CPL   1.35e-01  1.19e-01  7.31e-02  7.59e-02  3.56e-01  3.94e-01   ph/cm2/s
      90%_error_low -8.12e-02 -4.36e-02 -4.05e-02     N/A   -1.32e-01 -1.63e-01   ph/cm2/s
      90%_error_hi   4.14e-02  4.49e-02  4.37e-02     N/A    1.31e-01  1.52e-01   ph/cm2/s
 
======================================================================

Image

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

#   RAcent    DECcent   POSerr    Theta     Phi              Peak Cts       SNR   Name
  183.8196    57.2799   0.0171    17.9582  -102.9766         0.9208755     11.272 TRIG_00678929                 
 
Foreground time interval of the image:
 -5.604  44.656 (delta_t =  50.260 [sec])
Background time interval of the image:
-239.275  -5.604 (delta_t = 233.671 [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   -5.604 sec. to   44.656 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.30371     ( -0.233708   0.235242 )
Norm@50keV  : 1.20329E-03    ( -0.000151628   0.000151411 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          75.62 using 59 PHA bins.
# Reduced chi-squared =          1.327 for     57 degrees of freedom 
# Null hypothesis probability =   5.004063e-02
 
Photon flux (15-150 keV)    in 50.26 sec: 0.143656 ( -0.018527  0.018599 ) ph/cm2/s
Energy fluence (15-150 keV)             : 5.97149e-07 ( -8.46861e-08  8.5539e-08 ) ergs/cm2
 

Cutoff power-law model

Time interval is from   -5.604 sec. to   44.656 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.30547     ( -0.230038   0.63704 )
Epeak [keV] : 9999.32      ( -9999.36 -9999.36 )
Norm@50keV  : 1.20549E-03    ( -0.00120792   0.00106483 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          75.63 using 59 PHA bins.
# Reduced chi-squared =          1.351 for     56 degrees of freedom 
# Null hypothesis probability =   4.134737e-02
 
Photon flux (15-150 keV)    in 50.26 sec: 0.144593 (    ) ph/cm2/s
Energy fluence (15-150 keV)             : 6.00155e-07 ( -1.02724e-07  9.76959e-08 ) ergs/cm2
 

1-s peak spectrum fit

Power-law model

Time interval is from   24.792 sec. to   25.792 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.69041     ( -0.797865   0.703255 )
Norm@50keV  : 2.68253E-03    ( -0.00122336   0.00111309 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          69.01 using 59 PHA bins.
# Reduced chi-squared =          1.211 for     57 degrees of freedom 
# Null hypothesis probability =   1.323051e-01
 
Photon flux (15-150 keV)    in 1 sec: 0.355099 ( -0.131712  0.131752 ) ph/cm2/s
Energy fluence (15-150 keV)             : 2.48599e-08 ( -1.09546e-08  1.16382e-08 ) ergs/cm2
 

Cutoff power-law model

Time interval is from   24.792 sec. to   25.792 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.6942     ( -1.10829   1.04221 )
Epeak [keV] : 9999.14      ( -9999.34 -9999.35 )
Norm@50keV  : 2.66864E-03    (     )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          69.01 using 59 PHA bins.
# Reduced chi-squared =          1.232 for     56 degrees of freedom 
# Null hypothesis probability =   1.137162e-01
 
Photon flux (15-150 keV)    in 1 sec: 0.355642 ( -0.132468  0.131373 ) ph/cm2/s
Energy fluence (15-150 keV)             : 2.50484e-08 ( -1.18306e-08  8.00529e-09 ) ergs/cm2
 

Time-resolved spectra

Distribution

T90 vs. Hardness ratio plot

T90                                   = N/A sec.
Hardness ratio (energy fluence ratio) = N/A

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

S(15-50 keV)  = N/A
S(50-150 keV) = N/A

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 = -7.278023838885109E-02, IMY = 3.158355388760571E-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:
-239.275410 -5.604000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
107.9321  34.7983    2.2  58.1 -173.9   5.5483   5.3 ------	UNKNOWN                       
218.1220  41.7978    3.3  26.8  -31.7   0.6596   3.5 ------	UNKNOWN                       

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

Time interval of the image:
-5.604000 44.656000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
191.2205   3.7359    3.0  36.4   60.7   0.6349   3.9 ------	UNKNOWN                       
216.1134   3.2927    3.0  47.1   26.5   0.7863   3.9 ------	UNKNOWN                       
181.3940  41.9576    2.4   2.8 -125.5   0.3481   4.9 ------	UNKNOWN                       
183.8196  57.2799    1.0  18.0 -103.0   0.9207  11.3 ------	UNKNOWN                       
242.1888  22.0814    2.1  53.0  -14.4   1.0791   5.4 ------	UNKNOWN                       

Post-slew image of 15-350 keV band

Time interval of the image:
136.724600 921.924600
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
254.6005  35.2902    9.3  50.9  -18.7   1.1532   1.2    7.7	Her X-1                       
140.2402  23.4408    3.6  46.0  139.1   5.5155   3.2 ------	UNKNOWN                       
196.4739  46.0944    2.6  13.6   37.4   1.5921   4.5 ------	UNKNOWN                       
 95.7499  38.4940    4.9  57.5 -170.4   4.8374   2.4 ------	UNKNOWN