Analysis Summary

Notes:

======================================================================
                  BAT GRB EVENT DATA PROCESSING REPORT
    Process Script Ver: batgrbproduct v2.46
    Process Start Time: Mon Jul 15 18:45:52 EDT 2019
             Host Name: bat1
   Current Working Dir: /local/data/bat1/alien/Swift_3rdBATcatalog/event/batevent_reproc/trigger908288
======================================================================

  Trigger: 00908288      Segment: 000

  BAT Trigger Time: 582091661.376   [s; MET]
      Trigger Stop: 582091677.76   [s; MET]
               UTC: 2019-06-13T04:07:18.310160    [includes UTCF correction] 
       Where From?: TDRSS position message

  BAT 
    RA: 182.558815925826   Dec: 67.2327743021234  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    7.12
     Image Trigger?:     NO
     Rate S/N Ratio:     13.4164078649987  [ if not an image trigger ]
     Image S/N Ratio:    7.12

  Analysis Position:   [ source = BAT ]
    RA: 182.558815925826   Dec: 67.2327743021234  [deg; J2000]

  Refined Position:   [ source = BAT pre-slew burst ]
    RA: 182.552200555028   Dec: 67.2443496621523  [deg; J2000]  
        { 12h 10m 12.5s , +67d 14' 39.7" }
         +/- 2.21309937067005 [arcmin] (estimated 90% radius based on SNR)
         +/- 1.1220717430642 [arcmin] (formal 1-sigma fit error)
    SNR: 9.77822284193032
 
  Angular difference between the analysis and refined position is 0.711297 arcmin
 
  Partial Coding Fraction: 0.09667969    [ including projection effects ]

  Duration
     T90: 17.6319999694824 +/- 3.11392230173736
        Measured from: 1.74399995803833
                   to: 19.3759999275208     [s; relative to TRIGTIME]
     T50: 9.12000000476837 +/- 2.72512455032588
        Measured from: 5.2960000038147
                   to: 14.4160000085831     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: 6.88399994373322     
                   to: 7.88399994373322     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: 0.623999953269958     
                   to: 20.3199999332428     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     0.544444   0.796054   0.882720   0.361634
           0.141762   0.118954   0.107718   0.090518 [error]
 Peak      0.104727   0.045834   0.074682   0.065429
           0.030756   0.025742   0.025136   0.020389 [error]

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

======================================================================
 
 
====== Table of the duration information =============================
 
        Value   tstart    tstop
T100   19.696    0.624   20.320
T90    17.632    1.744   19.376
T50     9.120    5.296   14.416
Peak    1.000    6.884    7.884
 
 
====== 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      -1.218    -0.258      0.268       -           -               -         8.58e-03     -1.25e-03          1.24e-03      54.440   57
CPL     -1.013    -2.120      1.012      275.943    -275.943      -275.943      1.06e-02     -3.05e-03          1.71e-02      54.440   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      -2.519     -0.890     0.630       -           -               -         7.60e-03     -7.60e-03          3.64e-03      76.620   57
CPL     -1.754      N/A       N/A          15.777      N/A           N/A         1.96e-02        N/A               N/A         76.430   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   1.66e-07  3.62e-07  6.23e-07  2.48e-06  1.71e-06  3.63e-06   erg/cm2
      90%_error_low -4.79e-08 -6.62e-08 -9.88e-08 -8.00e-07 -2.52e-07 -8.57e-07   erg/cm2
      90%_error_hi   5.36e-08  6.47e-08  9.74e-08  1.04e-06  2.52e-07  1.06e-06   erg/cm2
Peak flux       PL   8.42e-01  4.67e-01  1.63e-01  7.43e-02  1.51e+00  1.55e+00   ph/cm2/s
      90%_error_low -4.42e-01 -1.92e-01 -1.02e-01 -7.43e-02 -6.52e-01 -6.54e-01   ph/cm2/s
      90%_error_hi   4.87e-01  1.92e-01  9.83e-02  1.02e-01  6.56e-01  6.58e-01   ph/cm2/s
 
Fluence        CPL   9.94e-08  1.35e-07  1.41e-07  3.38e-07  4.65e-07  7.39e-07   erg/cm2
      90%_error_low    N/A    -1.10e-07    N/A    -2.76e-07    N/A       N/A      erg/cm2
      90%_error_hi     N/A     5.93e-08    N/A     1.85e-07    N/A       N/A      erg/cm2
Peak flux      CPL   7.65e-01  5.21e-01  1.82e-01  4.19e-02  1.50e+00  1.51e+00   ph/cm2/s
      90%_error_low     N/A       N/A       N/A   -4.19e-02 -6.54e-01 -6.63e-01   ph/cm2/s
      90%_error_hi      N/A       N/A       N/A    1.35e-01  6.51e-01  6.45e-01   ph/cm2/s
 
======================================================================




Image

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

#   RAcent    DECcent   POSerr    Theta     Phi              Peak Cts       SNR   Name
  182.5522    67.2443   0.0195    39.2161   -91.1197         3.0031653      9.778 TRIG_00908288                 
 
Foreground time interval of the image:
  0.624  20.320 (delta_t =  19.696 [sec])
Background time interval of the image:
-239.376   0.624 (delta_t = 240.000 [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

Bokeh Plot

Other quick-look light curves:




Spectra

Notes:

Time averaged spectrum fit using the average DRM

Power-law model
Time interval is from    0.624 sec. to   20.320 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.21832     ( -0.258055   0.267894 )
Norm@50keV  : 8.57885E-03    ( -0.00124844   0.00123997 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          54.44 using 59 PHA bins.
# Reduced chi-squared =         0.9551 for     57 degrees of freedom 
# Null hypothesis probability =   5.717613e-01
 
Photon flux (15-150 keV)    in 19.7 sec: 1.00966 ( -0.157965  0.15995 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.70607e-06 ( -2.51593e-07  2.52489e-07 ) ergs/cm2
 
Cutoff power-law model
Time interval is from    0.624 sec. to   20.320 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.10304     ( -2.11042   1.02244 )
Epeak [keV] : 442.955      ( -347.747 -347.747 )
Norm@50keV  : 9.64443E-03    ( -0.00194643   0.0182358 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          54.41 using 59 PHA bins.
# Reduced chi-squared =         0.9716 for     56 degrees of freedom 
# Null hypothesis probability =   5.352495e-01
 
Photon flux (15-150 keV)    in 19.7 sec: 1.00408 ( -0.166227  0.15632 ) ph/cm2/s
Energy fluence (15-150 keV)             : 4.65324e-07 ( 0  0 ) ergs/cm2
 

1-s peak spectrum fit

Power-law model
Time interval is from    6.884 sec. to    7.884 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -2.51943     ( -0.890348   0.630066 )
Norm@50keV  : 7.60223E-03    ( -0.00760226   0.00364237 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          76.62 using 59 PHA bins.
# Reduced chi-squared =          1.344 for     57 degrees of freedom 
# Null hypothesis probability =   4.257701e-02
 
Photon flux (15-150 keV)    in 1 sec: 1.51160 ( -0.652171  0.6558 ) ph/cm2/s
Energy fluence (15-150 keV)             : 7.64434e-08 ( -3.22406e-08  3.22717e-08 ) ergs/cm2
 
Cutoff power-law model
Time interval is from    6.884 sec. to    7.884 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.75362     (       )
Epeak [keV] : 15.7768      (   )
Norm@50keV  : 1.96470E-02    (     )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          76.43 using 59 PHA bins.
# Reduced chi-squared =          1.365 for     56 degrees of freedom 
# Null hypothesis probability =   3.617196e-02
 
Photon flux (15-150 keV)    in 1 sec: 1.49857 ( -0.653935  0.65078 ) ph/cm2/s
Energy fluence (15-150 keV)             : 7.74694e-08 ( -3.2568e-08  3.26465e-08 ) ergs/cm2
 

Time-resolved spectra




Distribution

T90 vs. Hardness ratio plot

T90                                   = 17.632 sec.
Hardness ratio (energy fluence ratio) = 1.71917419862

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

S(15-50 keV)  = 5.281031e-07
S(50-150 keV) = 1.1779652e-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 = -1.594617122175715E-02, IMY = 8.158935246071674E-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:
-239.376000 0.624000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
254.4240  35.4864    6.3  16.7   35.8   1.0586   1.8    8.8	Her X-1                       
299.5994  35.2027    1.4  51.1   10.5   8.7077   8.0    0.4	Cyg X-1                       
308.2429  40.8121    0.0  54.8    0.5  -1.3104  -1.0   10.4	Cyg X-3                       
211.1947  22.3665    2.2  26.0  172.4   3.2996   5.3 ------	UNKNOWN                       

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

Time interval of the image:
0.624000 20.320000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
254.6041  35.3923    9.9  16.8   35.9   0.0874   1.2    7.8	Her X-1                       
299.7326  35.0845    0.0  51.2   10.5  -0.2513  -1.3    9.9	Cyg X-1                       
308.1215  41.0185    6.0  54.7    0.3   0.4816   1.9    4.0	Cyg X-3                       
301.5951  39.6137    2.9  50.7    4.5   0.6568   4.0 ------	UNKNOWN                       
187.4546  17.0407    2.3  46.1 -168.2   0.6808   5.1 ------	UNKNOWN                       
213.3508  65.3193    2.3  28.2  -80.7   0.4944   5.0 ------	UNKNOWN                       
173.0559  27.8252    2.3  51.1 -146.3   1.1460   5.0 ------	UNKNOWN                       
182.5522  67.2444    1.2  39.2  -91.1   3.0034   9.8 ------	UNKNOWN                       

Post-slew image of 15-350 keV band

Time interval of the image:
125.924600 962.713200
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
319.2968  52.5310    2.9  55.9   10.9  12.8170   4.0 ------	UNKNOWN                       
326.0770  62.9600    2.1  47.2    2.3  14.5926   5.4 ------	UNKNOWN                       
103.1006  50.4879    3.3  40.9  -92.3  26.8859   3.5 ------	UNKNOWN