GRB160303A

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 15:39:30 EDT 2016
             Host Name: bat1
   Current Working Dir: /local/data/bat1/alien/Swift_3rdBATcatalog/event/batevent_reproc/trigger677495
======================================================================

  Trigger: 00677495      Segment: 000

  BAT Trigger Time: 478695297.984   [s; MET]
      Trigger Stop: 478695298.24   [s; MET]
               UTC: 2016-03-03T10:54:42.058240    [includes UTCF correction] 
       Where From?: TDRSS position message

  BAT 
    RA: 168.681372288036   Dec: 22.7424795077935  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    8.2
     Image Trigger?:     NO
     Rate S/N Ratio:     29.4108823397055  [ if not an image trigger ]
     Image S/N Ratio:    8.2

  Analysis Position:   [ source = BAT ]
    RA: 168.681372288036   Dec: 22.7424795077935  [deg; J2000]

  Refined Position:   [ source = BAT pre-slew burst ]
    RA: 168.714337841967   Dec: 22.708156718444  [deg; J2000]  
        { 11h 14m 51.4s , +22d 42' 29.4" }
         +/- 2.01008996009481 [arcmin] (estimated 90% radius based on SNR)
         +/- 1.05890206865951 [arcmin] (formal 1-sigma fit error)
    SNR: 11.218980366806
 
  Angular difference between the analysis and refined position is 2.751247 arcmin
 
  Partial Coding Fraction: 0.9609375    [ including projection effects ]

  Duration
     T90: 4.97599995136261 +/- 1.00625245213938
        Measured from: -0.0120000243186951
                   to: 4.96399992704391     [s; relative to TRIGTIME]
     T50: 1.57199990749359 +/- 1.49214611727068
        Measured from: 0.171999990940094
                   to: 1.74399989843369     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: -0.0879999995231628     
                   to: 0.912000000476837     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: -0.0879999995231628     
                   to: 5.31999999284744     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     0.040896   0.073038   0.058930   0.046892
           0.011604   0.012297   0.010870   0.009448 [error]
 Peak      0.018298   0.042181   0.046754   0.021379
           0.005351   0.005763   0.005391   0.004693 [error]

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

======================================================================
 
 
====== Table of the duration information =============================
 
        Value   tstart    tstop
T100    5.408   -0.088    5.320
T90     4.976   -0.012    4.964
T50     1.572    0.172    1.744
Peak    1.000   -0.088    0.912
 
 
====== 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      -1.052    -0.322      0.346       -           -               -         2.57e-03     -4.38e-04          4.34e-04      54.490   57
CPL     -1.065    -0.306      0.383     9999.360    -9999.360      -9999.360      2.59e-03     -4.35e-04          1.91e-03      54.520   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      -0.803     -0.238     0.254       -           -               -         8.25e-03     -1.17e-03          1.15e-03      43.860   57
CPL     -0.506     -0.508     1.163      299.331    -299.331      -299.331      1.10e-02        N/A               N/A         43.580   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   1.17e-08  2.83e-08  5.46e-08  2.59e-07  1.48e-07  3.53e-07   erg/cm2
      90%_error_low -4.12e-09 -6.21e-09 -1.06e-08 -1.02e-07 -2.70e-08 -1.09e-07   erg/cm2
      90%_error_hi   4.58e-09  5.88e-09  1.03e-08  1.48e-07  2.73e-08  1.49e-07   erg/cm2
Peak flux       PL   1.75e-01  2.67e-01  3.06e-01  6.72e-01  9.48e-01  1.42e+00   ph/cm2/s
      90%_error_low -5.08e-02 -5.02e-02 -4.16e-02 -1.84e-01 -1.30e-01 -2.10e-01   ph/cm2/s
      90%_error_hi   5.71e-02  4.93e-02  4.14e-02  2.32e-01  1.30e-01  2.26e-01   ph/cm2/s
 
Fluence        CPL   1.17e-08  2.80e-08  5.30e-08  2.65e-07  1.48e-07  3.45e-07   erg/cm2
      90%_error_low    N/A    -5.87e-09 -8.99e-09 -1.68e-07 -2.75e-08 -1.41e-07   erg/cm2
      90%_error_hi     N/A     6.23e-09  1.20e-08  1.57e-07  2.68e-08  1.20e-07   erg/cm2
Peak flux      CPL   1.60e-01  2.70e-01  3.17e-01  4.98e-01  9.36e-01  1.25e+00   ph/cm2/s
      90%_error_low -6.52e-02 -5.23e-02 -4.98e-02 -2.91e-01 -1.36e-01 -3.32e-01   ph/cm2/s
      90%_error_hi   6.78e-02  5.29e-02  5.45e-02  2.13e-01  1.33e-01  2.23e-01   ph/cm2/s
 
======================================================================

Special notes of this burst

Image

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

#   RAcent    DECcent   POSerr    Theta     Phi              Peak Cts       SNR   Name
  168.7143    22.7082   0.0172    22.5514  -171.1635         0.2339239     11.219 TRIG_00677495                 
 
Foreground time interval of the image:
 -0.088   5.320 (delta_t =   5.408 [sec])
Background time interval of the image:
-244.083  -0.088 (delta_t = 243.995 [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

Bokeh Plot

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   -0.088 sec. to    5.320 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.0516     ( -0.32183   0.346065 )
Norm@50keV  : 2.57135E-03    ( -0.000438346   0.000434243 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          54.49 using 59 PHA bins.
# Reduced chi-squared =         0.9559 for     57 degrees of freedom 
# Null hypothesis probability =   5.699589e-01
 
Photon flux (15-150 keV)    in 5.408 sec: 0.297016 ( -0.05209  0.05226 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.47729e-07 ( -2.70489e-08  2.72783e-08 ) ergs/cm2

Cutoff power-law model

Time interval is from   -0.088 sec. to    5.320 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.06521     ( -0.306888   0.381496 )
Epeak [keV] : 9999.36      ( -9999.36 -9999.36 )
Norm@50keV  : 2.58949E-03    ( -0.000434014   0.00191444 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          54.52 using 59 PHA bins.
# Reduced chi-squared =         0.9736 for     56 degrees of freedom 
# Null hypothesis probability =   5.310604e-01
 
Photon flux (15-150 keV)    in 5.408 sec: 0.301659 ( -0.056793  0.04755 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.48111e-07 ( -2.75079e-08  2.67801e-08 ) ergs/cm2

1-s peak spectrum fit

Power-law model

Time interval is from   -0.088 sec. to    0.912 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -0.803042     ( -0.237819   0.253919 )
Norm@50keV  : 8.25025E-03    ( -0.00116714   0.00114651 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          43.86 using 59 PHA bins.
# Reduced chi-squared =         0.7695 for     57 degrees of freedom 
# Null hypothesis probability =   8.991643e-01
 
Photon flux (15-150 keV)    in 1 sec: 0.948107 ( -0.129706  0.130353 ) ph/cm2/s
Energy fluence (15-150 keV)             : 9.62986e-08 ( -1.34701e-08  1.35539e-08 ) ergs/cm2

Cutoff power-law model

Time interval is from   -0.088 sec. to    0.912 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -0.505937     ( -0.507626   1.16264 )
Epeak [keV] : 299.331      ( -299.168 -299.168 )
Norm@50keV  : 1.10493E-02    (     )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          43.58 using 59 PHA bins.
# Reduced chi-squared =         0.7782 for     56 degrees of freedom 
# Null hypothesis probability =   8.867404e-01
 
Photon flux (15-150 keV)    in 1 sec: 0.936113 ( -0.13572  0.133227 ) ph/cm2/s
Energy fluence (15-150 keV)             : 9.48943e-08 ( -1.46914e-08  1.28092e-08 ) ergs/cm2

Time-resolved spectra

Distribution

T90 vs. Hardness ratio plot

T90                                   = 4.976 sec.
Hardness ratio (energy fluence ratio) = 1.92974455973

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

S(15-50 keV)  = 3.998148e-08
S(50-150 keV) = 1.0774853e-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 = -4.103354961843101E-01, IMY = 6.379121452094097E-02

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:
-244.083380 -0.088000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
157.6604   9.3596    3.3  18.0  139.8   0.6779   3.4 ------	UNKNOWN                       
197.9386  48.5221    3.6  52.3 -139.4   3.5602   3.2 ------	UNKNOWN

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

Time interval of the image:
-0.088000 5.320000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
168.7143  22.7082    1.0  22.6 -171.2   0.2339  11.2 ------	UNKNOWN

Post-slew image of 15-350 keV band

Time interval of the image:
86.316600 962.096000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
124.7451  14.3207    2.9  42.4  162.4   0.8753   4.0 ------	UNKNOWN                       
102.0163  42.6873    4.2  58.0 -156.9   1.8783   2.7 ------	UNKNOWN

Analysis Summary

Notes:

Image

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

Light Curves

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:

Time averaged spectrum fit using the average DRM

Power-law model

Cutoff power-law model

1-s peak spectrum fit

Power-law model

Cutoff power-law model

Time-resolved spectra

Distribution

T90 vs. Hardness ratio plot

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

Mask shadow pattern

Spacecraft aspect plot

Bright source in the pre-burst/pre-slew/post-slew images

Pre-burst image of 15-350 keV band

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

Post-slew image of 15-350 keV band

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