batgrbproduct analysis for trigger=1400964

batgrbproduct Analysis for Trigger=1400964

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): Sat Feb 28 21:52:30 EST 2026
             Host Name: batproc1
   Current Working Dir: /local/data/bat1/alien/Swift_3rdBATcatalog/event/batevent_reproc/trigger1400964
======================================================================

  Trigger: 01400964      Segment: 000

  BAT Trigger Time: 781149546.496   [s; MET]
      Trigger Stop: 781149547.52   [s; MET]
               UTC: 2025-10-03T01:58:30.060220    [includes UTCF correction] 
       Where From?: TDRSS position message

  BAT 
    RA: 18.5033597732436   Dec: 56.506574432146  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    8.18
     Image Trigger?:     NO
     Rate S/N Ratio:     15.4596248337403  [ if not an image trigger ]
     Image S/N Ratio:    8.18

  Flight Position:   [ source = BAT ]
    RA: 18.5033597732436   Dec: 56.506574432146  [deg; J2000]

  Ground Position:   [ source = BAT pre-slew burst ]
    RA: 18.4947752437192   Dec: 56.4825189156569  [deg; J2000]  
        { 01h 13m 58.7s , +56d 28' 57.1" }
         +/- 1.39477259947119 [arcmin] (estimated 90% radius based on SNR)
         +/- 0.46450413745763 [arcmin] (formal 1-sigma fit error)
    SNR: 18.9097131728335
 
  Angular difference between Flight and Ground position is 1.471070 arcmin
 
  Partial Coding Fraction: 0.9765625    [ including projection effects ]

  Duration
     T90: 10.7840000391006 +/- 2.35201350948126
        Measured from: -1.98400008678436
                   to: 8.79999995231628     [s; relative to TRIGTIME]
     T50: 3.8639999628067 +/- 0.824621140158032
        Measured from: 0.0999999046325684
                   to: 3.96399986743927     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: 0.919999957084656     
                   to: 1.91999995708466     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: -2.41200006008148     
                   to: 9.80399990081787     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     0.238405   0.273165   0.185227   0.022723
           0.020033   0.020533   0.017042   0.013344 [error]
 Peak      0.030320   0.044697   0.045453   0.002466
           0.005838   0.006267   0.005146   0.003841 [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 6.43e-08 1.08e-07 1.38e-07 3.56e-07 4.09e-07 6.66e-07   erg/cm2
              Error 8.61e-09 8.97e-09 1.65e-08 8.92e-08 3.88e-08 1.03e-07   erg/cm2
Peak flux Power-law 2.67e-01 3.09e-01 2.57e-01 3.60e-01 9.63e-01 1.19e+00   ph/cm2/s
              Error 6.47e-02 4.71e-02 3.93e-02 1.12e-01 1.32e-01 1.65e-01   ph/cm2/s
 
Fluence   Cutoff-PL 6.27e-08 1.11e-07 1.39e-07 2.59e-07 4.02e-07 5.71e-07   erg/cm2
              Error 9.50e-09 1.12e-08 1.72e-08 1.84e-07 4.40e-08 1.46e-07   erg/cm2
Peak flux Cutoff-PL 2.06e-01 3.38e-01 2.88e-01 1.30e-01 9.22e-01 9.62e-01   ph/cm2/s
              Error 8.31e-02 5.77e-02 4.99e-02 1.29e-01 1.40e-01 1.89e-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    1.645    0.149    -      -           3.60e-03 3.17e-04   69.090 57
CPL   1.457    0.464     137.1  -31.5      4.52e-03 3.23e-03   68.790 56
 
 
=== 1-s peak spectral analysis ===
 
Model Ph_index Ph_90err Epeak  Epeak_90err Norm     Nomr_90err chi2   dof
PL    1.266    0.218    -      -           8.12e-03 1.08e-03   69.470 57
CPL   0.061    1.257      85.3  114.1      3.07e-02 6.82e-02   65.660 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: 19.840000 sec.
T50 in the 50-300 keV band: 7.680000 sec.

 
=== Table of the duration information ==
 
        Value   tstart    tstop
T100   12.216   -2.412    9.804
T90    10.784   -1.984    8.800
T50     3.864    0.100    3.964
Peak    1.000    0.920    1.920

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
   18.4948    56.4825   0.0101     9.6831    50.2763         0.7353866     18.910 TRIG_01400964                 
 
Foreground time interval of the image:
 -2.412   9.804 (delta_t =  12.216 [sec])
Background time interval of the image:
-239.496  -2.412 (delta_t = 237.084 [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

Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 1.024000

8 ms binning

From T100_start-3 s to T100_start+3 s

Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 1.024000

2 ms binning

From T100_start-1 s to T100_start+1 s

Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 1.024000

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   -2.412 sec. to    9.804 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.64486     ( -0.147749   0.150593 )
Norm@50keV  : 3.59771E-03    ( -0.000318823   0.000315355 )
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   69.09     using 59 bins.
 Reduced chi-squared = 1.21211
# Null hypothesis probability of 1.31e-01 with 57 degrees of freedom
 
Photon flux (15-150 keV)    in 12.22 sec: 0.468997 ( -0.038824  0.038859 ) ph/cm2/s
Energy fluence (15-150 keV)             : 4.09149e-07 ( -3.85609e-08  3.90402e-08 ) ergs/cm2

Cutoff power-law model

Time interval is from   -2.412 sec. to    9.804 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.45681     ( -0.644992   0.283177 )
Epeak [keV] : 137.097      ( -74.0762 -137.111 )
Norm@50keV  : 4.52326E-03    ( -0.00122012   0.00523768 )
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   68.79     using 59 bins.
 Reduced chi-squared = 1.22839
# Null hypothesis probability of 1.17e-01 with 56 degrees of freedom
 
Photon flux (15-150 keV)    in 12.22 sec: 0.464970 ( -0.040893  0.040692 ) ph/cm2/s
Energy fluence (15-150 keV)             : 4.0219e-07 ( -4.42322e-08  4.37349e-08 ) ergs/cm2

Band function

Time interval is from   -2.412 sec. to    9.804 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]    : 13.2429  (-1.35261  1.52409)
R^2/D10^2   : 7.96233E-02  (-0.0259256   0.0380289)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic  : Chi-Squared                  103.10     using 59 bins.
 Reduced chi-squared = 
# Null hypothesis probability of 1.79e-04 with 57 degrees of freedom
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  3.617e-08   5.750e-09
25- 50  1.271e-07   1.565e-08
50-150  1.424e-07   2.544e-08
15-150  3.057e-07   3.336e-08

Thermal bremsstrahlung (OTTB)

 
 
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT [keV]    : 154.071       (-50.7475      -153.698)
Norm        : 1.92955       (-0.176357     0.211545)
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   69.03     using 59 bins.
 Reduced chi-squared = 
# Null hypothesis probability of 1.32e-01 with 57 degrees of freedom
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  6.001e-08   7.723e-09
25- 50  1.121e-07   2.464e-08
50-150  2.259e-07   1.049e-07
15-150  3.980e-07   1.682e-07

Double BB

 
 
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT1 [keV]   : 5.82345        (-1.72417      2.25852)
R1^2/D10^2  : 0.952322        (-0.623928      1.68954)
kT2 [keV]   : 21.4069        (-4.44563      10.5455)
R2^2/D10^2  : 1.13421E-02    (-0.00873783   0.0100327)
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   71.07     using 59 bins.
 Reduced chi-squared = 
# Null hypothesis probability of 7.12e-02 with 55 degrees of freedom
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  6.207e-08   2.495e-08
25- 50  1.087e-07   3.402e-08
50-150  2.155e-07   8.079e-08
15-150  3.863e-07   1.433e-07

Peak spectrum fit

Power-law model

Time interval is from    0.920 sec. to    1.920 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.26623     ( -0.219354   0.215849 )
Norm@50keV  : 8.12317E-03    ( -0.00108171   0.00108158 )
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   69.47     using 59 bins.
 Reduced chi-squared = 1.21877
# Null hypothesis probability of 1.24e-01 with 57 degrees of freedom
 
Photon flux (15-150 keV)    in 1 sec: 0.963355 ( -0.132105  0.132425 ) ph/cm2/s
Energy fluence (15-150 keV)             : 8.09618e-08 ( -1.1715e-08  1.18023e-08 ) ergs/cm2

Cutoff power-law model

Time interval is from    0.920 sec. to    1.920 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 6.09061E-02     ( -1.44983   1.06341 )
Epeak [keV] : 85.2651      ( -21.0804 207.138 )
Norm@50keV  : 3.06615E-02    ( -0.0306664   0.105766 )
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   65.66     using 59 bins.
 Reduced chi-squared = 1.1725
# Null hypothesis probability of 1.77e-01 with 56 degrees of freedom
 
Photon flux (15-150 keV)    in 1 sec: 0.921838 ( -0.140897  0.139122 ) ph/cm2/s
Energy fluence (15-150 keV)             : 7.57757e-08 ( -1.26015e-08  1.27991e-08 ) ergs/cm2

Band function

Time interval is from    0.920 sec. to    1.920 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]    : 17.6356  (-2.34472  2.86086)
R^2/D10^2   : 6.94434E-02  (-0.028164   0.0441193)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   68.34     using 59 bins.
 Reduced chi-squared = 
# Null hypothesis probability of 1.45e-01 with 57 degrees of freedom
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  4.352e-09   1.198e-09
25- 50  1.982e-08   4.260e-09
50-150  4.449e-08   1.032e-08
15-150  6.866e-08   1.184e-08

Thermal bremsstrahlung (OTTB)

 
 
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT [keV]    : 200.000       (-46.4608      -200)
Norm        : 4.02361       (-0.541491     0.541491)
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   72.65     using 59 bins.
 Reduced chi-squared = 
# Null hypothesis probability of 7.92e-02 with 57 degrees of freedom
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  1.002e-08   5.665e-09
25- 50  1.927e-08   1.081e-08
50-150  4.227e-08   2.363e-08
15-150  7.157e-08   4.026e-08

Double BB

 
 
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT1 [keV]   : 3.99063        (-3.48622      -4.03266)
R1^2/D10^2  : 4.09585        (-3.95777      -4.04188)
kT2 [keV]   : 19.4489        (-3.09796      -19.4637)
R2^2/D10^2  : 4.71106E-02    (-0.043381   0.0406492)
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   64.55     using 59 bins.
 Reduced chi-squared = 
# Null hypothesis probability of 1.77e-01 with 55 degrees of freedom
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  7.156e-09   3.099e-09
25- 50  1.830e-08   5.610e-09
50-150  4.741e-08   1.745e-08
15-150  7.286e-08   2.153e-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: 1.64486     ( -0.147749   0.150593 )
Norm@50keV  : 3.59771E-03    ( -0.000318823   0.000315355 )
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   69.09     using 59 bins.
 Reduced chi-squared = 
# Null hypothesis probability of 1.31e-01 with 57 degrees of freedom
 
Photon flux (15-150 keV)    in 12.22 sec: 0.468979 ( -0.0388211  0.038856 ) ph/cm2/s
Energy fluence (15-150 keV)             : 4.09096e-07 ( -3.86194e-08  3.9034e-08 ) ergs/cm2

Cutoff power-law model

Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.45681     ( -0.644991   0.283181 )
Epeak [keV] : 137.092      ( -74.0764 -137.111 )
Norm@50keV  : 4.52331E-03    ( -0.00122012   0.00523767 )
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   68.79     using 59 bins.
 Reduced chi-squared = 
# Null hypothesis probability of 1.17e-01 with 56 degrees of freedom
 
Photon flux (15-150 keV)    in 12.22 sec: 0.464895 ( -0.040813  0.040376 ) ph/cm2/s
Energy fluence (15-150 keV)             : 4.02326e-07 ( -4.43158e-08  4.36682e-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)  = 1.08e-07
S(50-100 keV) = 1.38e-07

T90 vs. Hardness ratio plot

T90                                   = 10.7840000391006 sec.
Hardness ratio (energy fluence ratio) = 1.27778

Color vs. Color plot

Count Ratio  (25-50 keV) / (15-25 keV) = 1.1458
Count Ratio (50-100 keV) / (15-25 keV) = 0.776943

Mask shadow pattern

IMX = 1.090464935946764E-01, IMY = -1.312365260240749E-01

TIME vs. PHA plot around the trigger time

Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 1.024000

TIME vs. DetID plot around the trigger time

Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 1.024000

100 us light curve (15-350 keV)

Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 1.024000

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:
-239.496000 -2.412000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
299.5784  35.1889    0.9  48.6 -177.9   9.4332  12.9    1.0	Cyg X-1                       
308.0803  41.0146    2.7  40.1  178.8   1.9497   4.3    4.0	Cyg X-3                       
326.0879  38.1750    5.1  35.0  157.0   1.1326   2.3    9.6	Cyg X-2                       
 55.0912  42.6205    2.5  34.9   19.0   2.0833   4.7 ------	UNKNOWN                       
320.5393  39.1796    2.8  36.3  164.3   1.8401   4.2 ------	UNKNOWN                       
278.8281  72.0569    2.6  30.5 -122.1   1.7905   4.5 ------	UNKNOWN                       
227.9246  71.3108    3.0  41.7 -103.6   4.9935   3.9 ------	UNKNOWN                       
256.4803  56.3259    2.5  48.2 -129.3   7.1554   4.6 ------	UNKNOWN

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

Time interval of the image:
-2.412000 9.804000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
299.6414  35.1508   10.3  48.6 -178.0  -0.0944  -1.1    3.9	Cyg X-1                       
308.2008  40.8838    5.9  40.1  178.6  -0.1104  -1.9    5.8	Cyg X-3                       
326.1873  38.4480    5.0  34.7  157.1  -0.1282  -2.3    7.6	Cyg X-2                       
 18.4947  56.4825    0.6   9.7   50.3   0.7355  18.9 ------	UNKNOWN                       
281.7274  54.1841    2.0  41.1 -147.3   0.3577   5.6 ------	UNKNOWN                       
256.6592  56.4938    2.3  48.0 -129.3   0.8635   5.0 ------	UNKNOWN

Post-slew image of 15-350 keV band

Time interval of the image:
57.004600 474.504600
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
299.6181  35.1824    1.1  55.4 -178.2  16.9576  10.2    1.8	Cyg X-1                       
308.1891  40.9779    4.8  46.6 -179.4   2.8815   2.4    3.9	Cyg X-3                       
326.1301  38.1745   12.9  38.7  163.2   0.7628   0.9    9.0	Cyg X-2

Plot creation:
Sun Mar  1 23:20:56 EST 2026