batgrbproduct analysis for trigger=1444088

batgrbproduct Analysis for Trigger=1444088

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 16:15:22 EST 2026
             Host Name: batproc1
   Current Working Dir: /local/data/bat1/alien/Swift_3rdBATcatalog/event/batevent_reproc/trigger1444088
======================================================================

  Trigger: 01444088      Segment: 000

  BAT Trigger Time: 791229072   [s; MET]
      Trigger Stop: 791229176   [s; MET]
               UTC: 2026-01-27T17:50:34.881960    [includes UTCF correction] 
       Where From?: TDRSS position message

  BAT 
    RA: 231.856557841886   Dec: 6.75849016040837  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    11.04
     Image Trigger?:     YES
     Rate S/N Ratio:     0  [ if not an image trigger ]
     Image S/N Ratio:    11.04

  Flight Position:   [ source = BAT ]
    RA: 231.856557841886   Dec: 6.75849016040837  [deg; J2000]

  Ground Position:   [ source = BAT pre-slew burst ]
    RA: 231.874888685912   Dec: 6.76444046712168  [deg; J2000]  
        { 15h 27m 30.0s , +06d 45' 52.0" }
         +/- 1.64351772515017 [arcmin] (estimated 90% radius based on SNR)
         +/- 0.907092714861218 [arcmin] (formal 1-sigma fit error)
    SNR: 14.957852564586
 
  Angular difference between Flight and Ground position is 1.149072 arcmin
 
  Partial Coding Fraction: 0.4101562    [ including projection effects ]

  Duration
     T90: 103.167999982834 +/- 20.0110368702109
        Measured from: 3.30400002002716
                   to: 106.472000002861     [s; relative to TRIGTIME]
     T50: 18.0000001192093 +/- 9.08850701499744
        Measured from: 27.2079999446869
                   to: 45.2080000638962     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: 33.3559999465942     
                   to: 34.3559999465942     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: -2.67999994754791     
                   to: 117.672000050545     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     1.270873   1.344504   1.017121   0.265872
           0.105734   0.110198   0.091892   0.073203 [error]
 Peak      0.064730   0.091420   0.078932   0.021045
           0.010800   0.012364   0.010709   0.008182 [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 4.19e-07 6.59e-07 7.79e-07 1.79e-06 2.37e-06 3.65e-06   erg/cm2
              Error 5.59e-08 5.51e-08 9.24e-08 4.41e-07 2.18e-07 5.22e-07   erg/cm2
Peak flux Power-law 6.58e-01 6.98e-01 5.26e-01 6.42e-01 2.13e+00 2.52e+00   ph/cm2/s
              Error 1.61e-01 1.07e-01 8.59e-02 2.15e-01 3.01e-01 3.50e-01   ph/cm2/s
 
Fluence   Cutoff-PL 4.13e-07 6.66e-07 7.84e-07 1.50e-06 2.36e-06 3.37e-06   erg/cm2
              Error 5.65e-08 6.55e-08 9.60e-08 6.11e-07 2.34e-07 6.66e-07   erg/cm2
Peak flux Cutoff-PL 6.39e-01 7.09e-01 5.35e-01 5.42e-01 2.12e+00 2.42e+00   ph/cm2/s
              Error 1.76e-01 1.20e-01 9.88e-02 2.55e-01 3.06e-01 4.48e-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    1.756    0.147    -      -           2.14e-03 1.90e-04   69.280 57
CPL   1.650    0.551     159.3  -11.4      2.43e-03 1.80e-03   69.160 56
 
 
=== 1-s peak spectral analysis ===
 
Model Ph_index Ph_90err Epeak  Epeak_90err Norm     Nomr_90err chi2   dof
PL    1.410    0.231    -      -           1.74e-02 2.39e-03   58.910 57
CPL   1.257    1.256     257.5    0.0      2.07e-02 2.84e-02   58.820 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: 33.600000 sec.
T50 in the 50-300 keV band: 6.656000 sec.

 
=== Table of the duration information ==
 
        Value   tstart    tstop
T100  120.352   -2.680  117.672
T90   103.168    3.304  106.472
T50    18.000   27.208   45.208
Peak    1.000   33.356   34.356

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
  231.8749     6.7644   0.0129    38.9416  -141.2435         3.4962041     14.958 TRIG_01444088                 
 
Foreground time interval of the image:
 -2.680 112.501 (delta_t = 115.181 [sec])
Background time interval of the image:
-239.000  -2.680 (delta_t = 236.320 [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   -2.680 sec. to  117.672 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.75609     ( -0.145892   0.148796 )
Norm@50keV  : 2.13964E-03    ( -0.000190892   0.000188845 )
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   69.28     using 59 bins.
 Reduced chi-squared = 1.21544
# Null hypothesis probability of 1.28e-01 with 57 degrees of freedom
 
Photon flux (15-150 keV)    in 120.4 sec: 0.289982 ( -0.024616  0.024666 ) ph/cm2/s
Energy fluence (15-150 keV)             : 2.37666e-06 ( -2.17492e-07  2.19232e-07 ) ergs/cm2

Cutoff power-law model

Time interval is from   -2.680 sec. to  117.672 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.65049     ( -0.563411   0.538786 )
Epeak [keV] : 159.289      ( -136.557 -159.289 )
Norm@50keV  : 2.43183E-03    ( -0.00131827   0.00229119 )
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   69.16     using 59 bins.
 Reduced chi-squared = 1.235
# Null hypothesis probability of 1.11e-01 with 56 degrees of freedom
 
Photon flux (15-150 keV)    in 120.4 sec: 0.288743 ( -0.025345  0.025219 ) ph/cm2/s
Energy fluence (15-150 keV)             : 2.35867e-06 ( -2.35494e-07  2.31725e-07 ) ergs/cm2

Band function

Time interval is from   -2.680 sec. to  117.672 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]    : 12.8650  (  )
R^2/D10^2   : 5.30914E-02  (   )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic  : Chi-Squared                  115.85     using 59 bins.
 Reduced chi-squared = 
# Null hypothesis probability of 6.80e-06 with 57 degrees of freedom
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  2.244e-07   3.606e-08
25- 50  7.642e-07   8.091e-08
50-150  7.947e-07   1.375e-07
15-150  1.783e-06   1.854e-07

Thermal bremsstrahlung (OTTB)

 
 
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT [keV]    : 127.535       (-38.4979      59.1984)
Norm        : 1.20021       (-0.123068     0.164412)
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   70.45     using 59 bins.
 Reduced chi-squared = 
# Null hypothesis probability of 1.09e-01 with 57 degrees of freedom
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  3.753e-07   4.094e-08
25- 50  6.784e-07   7.663e-08
50-150  1.247e-06   4.847e-07
15-150  2.300e-06   5.635e-07

Double BB

 
 
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT1 [keV]   : 5.78454        (-1.20237      1.49486)
R1^2/D10^2  : 0.718292        (-0.408299      1.09838)
kT2 [keV]   : 23.1930        (-4.50588      7.77564)
R2^2/D10^2  : 4.86660E-03    (-0.00316013   0.00623908)
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   68.54     using 59 bins.
 Reduced chi-squared = 
# Null hypothesis probability of 1.04e-01 with 55 degrees of freedom
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  4.210e-07   1.227e-07
25- 50  6.451e-07   1.681e-07
50-150  1.272e-06   4.889e-07
15-150  2.338e-06   6.767e-07

Peak spectrum fit

Power-law model

Time interval is from   33.356 sec. to   34.356 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.40987     ( -0.230749   0.230492 )
Norm@50keV  : 1.74221E-02    ( -0.00239261   0.00238866 )
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   58.91     using 59 bins.
 Reduced chi-squared = 1.03351
# Null hypothesis probability of 4.05e-01 with 57 degrees of freedom
 
Photon flux (15-150 keV)    in 1 sec: 2.12653 ( -0.30112  0.30172 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.68027e-07 ( -2.49664e-08  2.50987e-08 ) ergs/cm2

Cutoff power-law model

Time interval is from   33.356 sec. to   34.356 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.25694     ( -0.971328   1.53999 )
Epeak [keV] : 257.452      ( -257.468 -257.468 )
Norm@50keV  : 2.07093E-02    ( -0.0175995   0.0391433 )
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   58.82     using 59 bins.
 Reduced chi-squared = 1.05036
# Null hypothesis probability of 3.73e-01 with 56 degrees of freedom
 
Photon flux (15-150 keV)    in 1 sec: 2.11700 ( -0.30617  0.30535 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.66905e-07 ( -2.60442e-08  2.56656e-08 ) ergs/cm2

Band function

Time interval is from   33.356 sec. to   34.356 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]    : 16.7403  (-2.85377  3.58373)
R^2/D10^2   : 0.169731  (-0.0832845   0.156041)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   73.07     using 59 bins.
 Reduced chi-squared = 
# Null hypothesis probability of 7.43e-02 with 57 degrees of freedom
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  9.727e-09   2.964e-09
25- 50  4.251e-08   1.049e-08
50-150  8.463e-08   2.399e-08
15-150  1.369e-07   2.550e-08

Thermal bremsstrahlung (OTTB)

 
 
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT [keV]    : 200.000       (-62.5848      -200)
Norm        : 8.84027       (-1.21153     1.21153)
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   60.14     using 59 bins.
 Reduced chi-squared = 
# Null hypothesis probability of 3.63e-01 with 57 degrees of freedom
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  2.201e-08   1.250e-08
25- 50  4.235e-08   2.366e-08
50-150  9.288e-08   5.185e-08
15-150  1.572e-07   8.825e-08

Double BB

 
 
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT1 [keV]   : 7.41368        (-3.21544      4.15217)
R1^2/D10^2  : 1.74464        (-1.27187      12.2798)
kT2 [keV]   : 29.3191        (-9.34092      54.8668)
R2^2/D10^2  : 1.99727E-02    (-0.0188999   0.0612035)
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   59.21     using 59 bins.
 Reduced chi-squared = 
# Null hypothesis probability of 3.25e-01 with 55 degrees of freedom
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  1.901e-08   1.051e-08
25- 50  4.151e-08   2.150e-08
50-150  1.070e-07   5.930e-08
15-150  1.675e-07   8.645e-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: 1.77456     ( -0.147103   0.150251 )
Norm@50keV  : 2.16457E-03    ( -0.000196132   0.000193856 )
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   68.82     using 59 bins.
 Reduced chi-squared = 
# Null hypothesis probability of 1.36e-01 with 57 degrees of freedom
 
Photon flux (15-150 keV)    in 115.2 sec: 0.295382 ( -0.0252119  0.0252453 ) ph/cm2/s
Energy fluence (15-150 keV)             : 2.298e-06 ( -2.12764e-07  2.14249e-07 ) ergs/cm2

Cutoff power-law model

Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.66936     ( -0.574765   0.522231 )
Epeak [keV] : 149.811      ( -121.961 -149.815 )
Norm@50keV  : 2.46140E-03    ( -0.000963433   0.00241236 )
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   68.71     using 59 bins.
 Reduced chi-squared = 
# Null hypothesis probability of 1.19e-01 with 56 degrees of freedom
 
Photon flux (15-150 keV)    in 115.2 sec: 0.294111 ( -0.025946  0.025901 ) ph/cm2/s
Energy fluence (15-150 keV)             : 2.28126e-06 ( -2.3116e-07  2.26794e-07 ) 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)  = 6.59e-07
S(50-100 keV) = 7.79e-07

T90 vs. Hardness ratio plot

T90                                   = 103.167999982834 sec.
Hardness ratio (energy fluence ratio) = 1.18209

Color vs. Color plot

Count Ratio  (25-50 keV) / (15-25 keV) = 1.05794
Count Ratio (50-100 keV) / (15-25 keV) = 0.800333

Mask shadow pattern

IMX = -6.301666798253378E-01, IMY = 5.058793776288397E-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:
-239.000000 -2.680000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
170.4227 -60.6569    4.8  57.3  -17.9   2.8154   2.4    3.7	Cen X-3                       
186.6222 -62.8171    6.0  56.7  -27.4  -3.2357  -1.9    3.0	GX 301-2                      
174.4687  -5.8892    2.5  20.6   58.5   1.5574   4.7 ------	UNKNOWN

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

Time interval of the image:
-2.680000 112.500600
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
170.0309 -60.5987   39.8  57.3  -17.7  -0.2130  -0.3    8.5	Cen X-3                       
186.5978 -62.8815   12.5  56.8  -27.4   0.8446   1.0    6.9	GX 301-2                      
158.4745 -26.4522    2.0  40.2   23.9   1.3437   5.8 ------	UNKNOWN                       
231.8749   6.7645    0.8  38.9 -141.2   3.4965  14.9 ------	UNKNOWN

Post-slew image of 15-350 keV band

Time interval of the image:
192.900600 963.165800
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
244.9648 -15.6407    0.6  25.9  -49.6  25.7273  20.9    0.8	Sco X-1                       
254.4477  35.5198    4.0  35.5 -167.0   3.9275   2.9   10.7	Her X-1                       
256.2283 -37.7226 1645.8  49.9  -44.8  -0.0309  -0.0   13.6	4U 1700-377                   
256.4518 -36.3761   57.7  48.9  -46.0   0.8656   0.2    2.9	GX 349+2                      
263.0924 -24.6605   17.6  43.7  -62.6   2.8984   0.7    6.8	GX 1+4                        
268.4160  -1.3548   12.9  37.4  -98.4   3.0002   0.9    6.5	SW J1753.5-0127               
196.3773 -34.7935    2.7  53.3   16.9  12.5478   4.2 ------	UNKNOWN                       
211.6674   2.1469    3.7  20.7   58.5   3.4506   3.1 ------	UNKNOWN                       
243.1774  56.3115    2.1  50.4  168.5  17.3717   5.4 ------	UNKNOWN                       
254.6566 -12.6266    2.5  29.8  -69.1   7.3719   4.7 ------	UNKNOWN                       
271.2289   1.1636    2.7  39.6 -103.2  18.7404   4.2 ------	UNKNOWN

Plot creation:
Sun Mar  1 23:05:02 EST 2026