batgrbproduct analysis for trigger=1320335

batgrbproduct Analysis for Trigger=1320335

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 v2.48
    Process Start Time (local time): Thu Jun 19 20:31:37 EDT 2025
             Host Name: batproc1
   Current Working Dir: /local/data/bat1/alien/Swift_3rdBATcatalog/event/batevent_reproc/trigger1320335
======================================================================

  Trigger: 01320335      Segment: 000

  BAT Trigger Time: 770605858.816   [s; MET]
      Trigger Stop: 770605859.84   [s; MET]
               UTC: 2025-06-03T01:10:23.098520    [includes UTCF correction] 
       Where From?: TDRSS position message

  BAT 
    RA: 129.91830155637   Dec: -39.2683922386952  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    7.82
     Image Trigger?:     NO
     Rate S/N Ratio:     11.6189500386223  [ if not an image trigger ]
     Image S/N Ratio:    7.82

  Flight Position:   [ source = BAT ]
    RA: 129.91830155637   Dec: -39.2683922386952  [deg; J2000]

  Ground Position:   [ source = BAT pre-slew burst ]
    RA: 129.94746943489   Dec: -39.3091152540435  [deg; J2000]  
        { 08h 39m 47.4s , -39d 18' 32.8" }
         +/- 1.9648503418564 [arcmin] (estimated 90% radius based on SNR)
         +/- 0.681663951165176 [arcmin] (formal 1-sigma fit error)
    SNR: 11.5898087727061
 
  Angular difference between Flight and Ground position is 2.793701 arcmin
 
  Partial Coding Fraction: 0.7734375    [ including projection effects ]

  Duration
     T90: 15.7120000123978 +/- 11.8749769185584
        Measured from: -11.6840000152588
                   to: 4.02799999713898     [s; relative to TRIGTIME]
     T50: 1.93599987030029 +/- 7.63888076082279
        Measured from: -0.0239999294281006
                   to: 1.91199994087219     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: 0.136000037193298     
                   to: 1.1360000371933     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: -13.8639999628067     
                   to: 15.8000000715256     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     0.179106   0.265304   0.116869   0.054554
           0.038378   0.039342   0.032385   0.026648 [error]
 Peak      0.044311   0.068719   0.037160   0.006821
           0.007633   0.008259   0.006591   0.005046 [error]

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

======================================================================
 
=== 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   Power-law 6.50e-08 1.01e-07 1.17e-07 2.62e-07 3.59e-07 5.43e-07   erg/cm2
              Error 1.67e-08 1.76e-08 3.08e-08 1.40e-07 7.31e-08 1.70e-07   erg/cm2
Peak flux Power-law 4.90e-01 4.32e-01 2.61e-01 2.38e-01 1.29e+00 1.42e+00   ph/cm2/s
              Error 1.06e-01 6.42e-02 5.21e-02 8.97e-02 1.90e-01 2.11e-01   ph/cm2/s
 
Fluence   Cutoff-PL 6.23e-08 1.08e-07 1.16e-07 1.07e-07 3.41e-07 3.92e-07   erg/cm2
              Error 1.81e-08 2.40e-08 3.71e-08 1.45e-07 8.50e-08 1.77e-07   erg/cm2
Peak flux Cutoff-PL 4.22e-01 5.02e-01 2.77e-01 6.80e-02 1.26e+00 1.27e+00   ph/cm2/s
              Error 1.20e-01 8.83e-02 6.35e-02 9.03e-02 1.92e-01 2.02e-01   ph/cm2/s
 
Fluence        Band -------- -------- -------- -------- -------- --------   erg/cm2
              Error -------- -------- -------- -------- -------- --------   erg/cm2
Peak flux      Band -------- -------- -------- -------- -------- --------   ph/cm2/s
              Error -------- -------- -------- -------- -------- --------   ph/cm2/s

 
=== Time-averaged spectral analysis ===
 
Model Ph_index Ph_90err Epeak  Epeak_90err Norm     Nomr_90err chi2   dof
PL    1.781    0.305    -      -           1.31e-03 2.60e-04   75.430 57
CPL   1.260    1.381      60.8   -0.1      2.62e-03 1.61e-02   74.900 56
 
 
=== 1-s peak spectral analysis ===
 
Model Ph_index Ph_90err Epeak  Epeak_90err Norm     Nomr_90err chi2   dof
PL    1.726    0.233    -      -           9.59e-03 1.53e-03   51.710 57
CPL   0.468    1.146      55.3   26.9      4.71e-02 1.24e-01   46.730 56
 
Model      : spectral model: simple power-law (PL) and cutoff power-law (CPL)
Ph_index   : photon index: E^-{Ph_index} (minus sign is not included in the 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 PL model and at 1 keV in CPL model
Nomr_90err : 90% error of the normalization
chi2       : Chi-Squared
dof        : degree of freedom

 
=== T90/T50 calculation in the 50-300 keV band (BATSE band) using 64 ms lc ===
 
T90 in the 50-300 keV band: 3.136000 sec.
T50 in the 50-300 keV band: 1.216000 sec.

 
=== Table of the duration information ==
 
        Value   tstart    tstop
T100   29.664  -13.864   15.800
T90    15.712  -11.684    4.028
T50     1.936   -0.024    1.912
Peak    1.000    0.136    1.136

Click here for the BAT GCN circular template

Estimated redshift from machine learning (Ukwatta et al. 2016) - may take a few minute to calcaulte

Image

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

#   RAcent    DECcent   POSerr    Theta     Phi              Peak Cts       SNR   Name
  129.9475   -39.3091   0.0166    31.3421    -9.8427         0.8137395     11.590 TRIG_01320335                 
 
Foreground time interval of the image:
-13.864  11.685 (delta_t =  25.549 [sec])
Background time interval of the image:
-239.816 -13.864 (delta_t = 225.952 [sec])

Lightcurves

Notes:

1) The mask-weighted light curves are using the flight position.
2) Multiple plots of different time binning/intervals are shown to cover all scenarios of short/long GRBs, rate/image triggers, and real/false positives.
3) For all the mask-weighted lightcurves, the y-axis units are counts/sec/det where a det is 0.4 x 0.4 = 0.16 sq cm.
4) The verticle lines correspond to following: green dotted lines are T50 interval, black dotted lines are T90 interval, blue solid line(s) is a spacecraft slew start time, and orange solid line(s) is a spacecraft slew end time.
5) Time of each bin is in the middle of the bin.

1 s binning

From T0-310 s to T0+310 s

From T100_start - 20 s to T100_end + 30 s

Full time interval

64 ms binning

Full time interval

From T100_start to T100_end

From T0-5 sec to T0+5 sec

16 ms binning

From T100_start-5 s to T100_start+5 s

8 ms binning

From T100_start-3 s to T100_start+3 s

2 ms binning

From T100_start-1 s to T100_start+1 s

SN=5 or 10 sec. binning (whichever binning is satisfied first)

SN=5 or 10 sec. binning (T < 200 sec)

Quad-rate summed light curves (from T0-300s to T0+1000s)

Spectral Evolution

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  -13.864 sec. to   15.800 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.78127     ( -0.297095   0.312215 )
Norm@50keV  : 1.31425E-03    ( -0.000263554   0.000256678 )
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   75.43     using 59 bins.
 Reduced chi-squared = 1.32333
# Null hypothesis probability of 5.16e-02 with 57 degrees of freedom
 
Photon flux (15-150 keV)    in 29.66 sec: 0.179812 ( -0.031677  0.031699 ) ph/cm2/s
Energy fluence (15-150 keV)             : 3.5918e-07 ( -7.22989e-08  7.38736e-08 ) ergs/cm2

Cutoff power-law model

Time interval is from  -13.864 sec. to   15.800 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.25981     ( -1.80503   0.9564 )
Epeak [keV] : 60.8191      ( -60.5607 -60.8161 )
Norm@50keV  : 2.61837E-03    ( -0.00261859   0.0295621 )
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   74.90     using 59 bins.
 Reduced chi-squared = 1.3375
# Null hypothesis probability of 4.67e-02 with 56 degrees of freedom
 
Photon flux (15-150 keV)    in 29.66 sec: 0.177164 ( -0.032388  0.032306 ) ph/cm2/s
Energy fluence (15-150 keV)             : 3.40627e-07 ( -8.52683e-08  8.47273e-08 ) ergs/cm2

Band function

Time interval is from  -13.864 sec. to   15.800 sec.
 
 
Spectral model in the Band function:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
alpha       :    (     )
beta        :     (     )
Epeak [keV] :       (   )
Norm@50keV   :     (     )
------------------------------------------------------------
 
Photon flux (15-150 keV)    in  sec:  (    ) ph/cm2/s
Energy fluence (15-150 keV)             : 0 ( 0  0 ) ergs/cm2

Single BB

 
Spectral model blackbody:
------------------------------------------------------------
Parameters  : value    Lower 90%  Upper 90%
kT [keV]    : 10.2915  (-1.88537  2.48372)
R^2/D10^2   : 7.81817E-02  (-0.0438033   0.0900452)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   79.97     using 59 bins.
 Reduced chi-squared = 
# Null hypothesis probability of 2.41e-02 with 57 degrees of freedom
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  5.048e-08   1.675e-08
25- 50  1.306e-07   3.917e-08
50-150  7.406e-08   3.097e-08
15-150  2.552e-07   6.601e-08

Thermal bremsstrahlung (OTTB)

 
 
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT [keV]    : 97.7887       (-44.1931      -97.7887)
Norm        : 0.805567       (-0.165529     0.246292)
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   74.85     using 59 bins.
 Reduced chi-squared = 
# Null hypothesis probability of 5.65e-02 with 57 degrees of freedom
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  6.244e-08   1.541e-08
25- 50  1.075e-07   2.831e-08
50-150  1.720e-07   1.009e-07
15-150  3.419e-07   1.312e-07

Double BB

 
 
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT1 [keV]   : 7.98303        (-2.22888      2.39756)
R1^2/D10^2  : 0.170610        (-0.104602      0.332999)
kT2 [keV]   : 40.1033        (-21.8543      -39.3508)
R2^2/D10^2  : 3.64343E-04    (-0.000405826   0.00663621)
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   72.12     using 59 bins.
 Reduced chi-squared = 
# Null hypothesis probability of 6.05e-02 with 55 degrees of freedom
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  6.046e-08   3.498e-08
25- 50  1.168e-07   6.848e-08
50-150  1.730e-07   1.050e-07
15-150  3.503e-07   1.778e-07

Peak spectrum fit

Power-law model

Time interval is from    0.136 sec. to    1.136 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.72620     ( -0.228233   0.237334 )
Norm@50keV  : 9.58679E-03    ( -0.00154211   0.00151999 )
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   51.71     using 59 bins.
 Reduced chi-squared = 0.907193
# Null hypothesis probability of 6.73e-01 with 57 degrees of freedom
 
Photon flux (15-150 keV)    in 1 sec: 1.28516 ( -0.1903  0.19045 ) ph/cm2/s
Energy fluence (15-150 keV)             : 8.86074e-08 ( -1.46145e-08  1.48091e-08 ) ergs/cm2

Cutoff power-law model

Time interval is from    0.136 sec. to    1.136 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 0.467891     ( -1.29974   0.99151 )
Epeak [keV] : 55.3246      ( -12.1811 41.532 )
Norm@50keV  : 4.71112E-02    ( -0.0471111   0.201776 )
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   46.73     using 59 bins.
 Reduced chi-squared = 0.834464
# Null hypothesis probability of 8.07e-01 with 56 degrees of freedom
 
Photon flux (15-150 keV)    in 1 sec: 1.25554 ( -0.19138  0.19174 ) ph/cm2/s
Energy fluence (15-150 keV)             : 8.22129e-08 ( -1.49648e-08  1.55311e-08 ) ergs/cm2

Band function

Time interval is from    0.136 sec. to    1.136 sec.
 
 
Spectral model in the Band function:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
alpha       :    (     )
beta        :     (     )
Epeak [keV] :       (   )
Norm@50keV   :     (     )
------------------------------------------------------------
 
Photon flux (15-150 keV)    in  sec:  (    ) ph/cm2/s
Energy fluence (15-150 keV)             : 0 ( 0  0 ) ergs/cm2

Single BB

 
Spectral model blackbody:
------------------------------------------------------------
Parameters  : value    Lower 90%  Upper 90%
kT [keV]    : 12.1474  (-1.87267  2.24217)
R^2/D10^2   : 0.319574  (-0.149702   0.272013)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   52.46     using 59 bins.
 Reduced chi-squared = 
# Null hypothesis probability of 6.46e-01 with 57 degrees of freedom
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  9.983e-09   2.625e-09
25- 50  3.187e-08   6.910e-09
50-150  2.850e-08   9.325e-09
15-150  7.036e-08   1.559e-08

Thermal bremsstrahlung (OTTB)

 
 
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT [keV]    : 116.694       (-45.1455      -112.687)
Norm        : 5.50856       (-0.961264     1.26724)
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   48.59     using 59 bins.
 Reduced chi-squared = 
# Null hypothesis probability of 7.79e-01 with 57 degrees of freedom
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  1.436e-08   2.805e-09
25- 50  2.557e-08   7.320e-09
50-150  4.500e-08   2.896e-08
15-150  8.493e-08   3.667e-08

Double BB

 
 
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT1 [keV]   : 7.41594        (-2.81128      3.15947)
R1^2/D10^2  : 1.19980        (-0.770421      3.77724)
kT2 [keV]   : 20.9944        (-15.6722      24.7157)
R2^2/D10^2  : 2.71429E-02    (-0.0251306   0.120974)
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   45.44     using 59 bins.
 Reduced chi-squared = 
# Null hypothesis probability of 8.18e-01 with 55 degrees of freedom
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  1.347e-08   7.550e-09
25- 50  2.875e-08   1.538e-08
50-150  4.165e-08   2.442e-08
15-150  8.386e-08   4.295e-08

Pre-slew spectrum (Pre-slew PHA with pre-slew DRM)

Power-law model

 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.90177     ( -0.273967   0.292773 )
Norm@50keV  : 1.61682E-03    ( -0.000299786   0.00028855 )
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   81.46     using 59 bins.
 Reduced chi-squared = 
# Null hypothesis probability of 1.84e-02 with 57 degrees of freedom
 
Photon flux (15-150 keV)    in 25.55 sec: 0.232205 ( -0.0347736  0.0347872 ) ph/cm2/s
Energy fluence (15-150 keV)             : 3.79796e-07 ( -6.7512e-08  6.90376e-08 ) ergs/cm2

Cutoff power-law model

Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 2.06217     ( -0.912299   1.19955 )
Epeak [keV] : 27.8378      ( -9999.35 -9999.36 )
Norm@50keV  : 1.31212E-03    ( -0.000354855   0.00375179 )
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   81.29     using 59 bins.
 Reduced chi-squared = 
# Null hypothesis probability of 1.53e-02 with 56 degrees of freedom
 
Photon flux (15-150 keV)    in 25.55 sec: 0.232314 ( -0.03465  0.034625 ) ph/cm2/s
Energy fluence (15-150 keV)             : 3.78347e-07 ( -6.9634e-08  6.94986e-08 ) ergs/cm2

Band function

 
 
Spectral model in the Band function:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
alpha       :    (     )
beta        :     (     )
Epeak [keV] :       (   )
Norm@50keV   :     (     )
------------------------------------------------------------
 
Photon flux (15-150 keV)    in  sec:  (    ) ph/cm2/s
Energy fluence (15-150 keV)             : 0 ( 0  0 ) ergs/cm2

S(25-50 keV) vs. S(50-100 keV) plot

S(25-50 keV)  = 1.01e-07
S(50-100 keV) = 1.17e-07

T90 vs. Hardness ratio plot

T90                                   = 15.7120000123978 sec.
Hardness ratio (energy fluence ratio) = 1.15842

Color vs. Color plot

Count Ratio  (25-50 keV) / (15-25 keV) = 1.48127
Count Ratio (50-100 keV) / (15-25 keV) = 0.652513

Mask shadow pattern

IMX = 6.000525167386274E-01, IMY = 1.041072258269904E-01

TIME vs. PHA plot around the trigger time

TIME vs. DetID plot around the trigger time

100 us light curve (15-350 keV)

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:
-239.816000 -13.864000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
135.4898 -40.5527    3.3  33.3   -2.5   1.3447   3.5    1.8	Vela X-1                      
170.3152 -60.4832   10.9  39.0   47.2  -0.6747  -1.1    8.4	Cen X-3                       
138.5543 -35.5642    2.5  38.7   -5.1   1.8747   4.5 ------	UNKNOWN                       
 68.2014 -37.1198    2.6  24.8 -127.3   1.4276   4.4 ------	UNKNOWN                       
 35.7999 -27.8724    2.9  47.8 -158.0   2.6258   4.0 ------	UNKNOWN                       
 83.5753 -18.2959    2.7  39.3  -92.0   5.1918   4.2 ------	UNKNOWN                       
 61.7923 -17.8259    2.4  44.7 -122.1   6.5741   4.8 ------	UNKNOWN

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

Time interval of the image:
-13.864000 11.684600
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
135.3397 -40.5259    3.9  33.3   -2.6  -0.2142  -3.0    8.8	Vela X-1                      
170.2277 -60.7098    3.7  38.8   47.5   0.3947   3.2    5.8	Cen X-3                       
  0.6761 -68.6107    2.1  38.2  133.9   0.6738   5.6 ------	UNKNOWN                       
129.9475 -39.3091    1.0  31.3   -9.8   0.8137  11.6 ------	UNKNOWN                       
 85.9792 -25.6872    2.1  31.7  -89.3   0.5459   5.4 ------	UNKNOWN

Post-slew image of 15-350 keV band

Time interval of the image:
84.684600 962.279000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
135.5695 -40.5952    1.8   4.5   71.9   6.1357   6.3    3.1	Vela X-1                      
169.9923 -60.6899   18.6  32.7  107.3  -1.3177  -0.6   10.3	Cen X-3                       
186.3176 -62.6887    0.0  40.6  107.1   5.9163   1.2   10.5	GX 301-2                      
 65.1018 -74.4650    3.6  45.7  162.8  11.1065   3.2 ------	UNKNOWN                       
 53.1294 -53.8272    3.5  52.0 -170.2  10.4312   3.3 ------	UNKNOWN                       
108.7418 -14.9742    2.5  30.6  -80.3   6.9281   4.6 ------	UNKNOWN                       
111.5309   1.1545    3.0  43.8  -64.1  20.4053   3.8 ------	UNKNOWN

Plot creation:
Fri Jun 20 01:36:46 EDT 2025