batgrbproduct analysis for trigger=1275005

batgrbproduct Analysis for Trigger=1275005

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 22:05:17 EDT 2025
             Host Name: batproc1
   Current Working Dir: /local/data/bat1/alien/Swift_3rdBATcatalog/event/batevent_reproc/trigger1275005
======================================================================

  Trigger: 01275005      Segment: 000

  BAT Trigger Time: 756173365.888   [s; MET]
      Trigger Stop: 756173378.048   [s; MET]
               UTC: 2024-12-18T00:08:51.156520    [includes UTCF correction] 
       Where From?: TDRSS position message

  BAT 
    RA: 185.682435528346   Dec: 29.9908165521575  [deg; J2000]

     Catalogged Source?: YES
     Point Source?:      YES
     GRB Indicated?:     NO    [ by BAT flight software ]
     Image S/N Ratio:    8.41
     Image Trigger?:     NO
     Rate S/N Ratio:     9.4339811320566  [ if not an image trigger ]
     Image S/N Ratio:    8.41

  Flight Position:   [ source = BAT ]
    RA: 185.682435528346   Dec: 29.9908165521575  [deg; J2000]

  Ground Position:   [ source = BAT pre-slew burst ]
    RA: 185.686438643986   Dec: 29.9858745825619  [deg; J2000]  
        { 12h 22m 44.7s , +29d 59' 09.1" }
         +/- 2.0964173562907 [arcmin] (estimated 90% radius based on SNR)
         +/- 0.986700826568091 [arcmin] (formal 1-sigma fit error)
    SNR: 10.5648772698192
 
  Angular difference between Flight and Ground position is 0.362216 arcmin
 
  Partial Coding Fraction: 0.5234375    [ including projection effects ]

  Duration
     T90: 23.3519998788834 +/- 4.45043320850395
        Measured from: -0.0839999914169312
                   to: 23.2679998874664     [s; relative to TRIGTIME]
     T50: 11.9639998674393 +/- 4.38963015187202
        Measured from: 5.16400003433228
                   to: 17.1279999017715     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: 8.88800001144409     
                   to: 9.88800001144409     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: -1.82400000095367     
                   to: 26.1599999666214     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     0.196121   0.269063   0.303078   0.045829
           0.044466   0.046821   0.039820   0.032950 [error]
 Peak      0.008055   0.040059   0.021920   0.003235
           0.008343   0.009331   0.007879   0.006390 [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 6.07e-08 1.25e-07 1.99e-07 7.13e-07 5.54e-07 1.10e-06   erg/cm2
              Error 1.76e-08 2.26e-08 3.79e-08 2.91e-07 9.61e-08 3.17e-07   erg/cm2
Peak flux Power-law 1.65e-01 1.93e-01 1.63e-01 2.32e-01 6.04e-01 7.53e-01   ph/cm2/s
              Error 9.73e-02 7.63e-02 5.84e-02 1.59e-01 2.14e-01 2.56e-01   ph/cm2/s
 
Fluence   Cutoff-PL 5.01e-08 1.34e-07 2.17e-07 2.60e-07 5.32e-07 6.60e-07   erg/cm2
              Error 2.10e-08 2.68e-08 4.53e-08 3.59e-07 9.92e-08 3.71e-07   erg/cm2
Peak flux Cutoff-PL 8.75e-02 2.48e-01 2.08e-01 2.93e-02 5.71e-01 5.73e-01   ph/cm2/s
              Error 1.03e-01 1.09e-01 8.67e-02 8.14e-02 2.10e-01 2.16e-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    1.319    0.265    -      -           2.01e-03 3.25e-04   56.110 57
CPL   0.420    1.130      95.5  -31.9      5.32e-03 9.47e-03   53.720 56
 
 
=== 1-s peak spectral analysis ===
 
Model Ph_index Ph_90err Epeak  Epeak_90err Norm     Nomr_90err chi2   dof
PL    1.250    0.503    -      -           5.11e-03 1.73e-03   64.120 57
CPL  -1.820    5.186      63.8   47.0      1.62e-01 4.32e+02   59.970 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: 24.448000 sec.
T50 in the 50-300 keV band: 11.840000 sec.

 
=== Table of the duration information ==
 
        Value   tstart    tstop
T100   27.984   -1.824   26.160
T90    23.352   -0.084   23.268
T50    11.964    5.164   17.128
Peak    1.000    8.888    9.888

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
  185.6864    29.9859   0.0181    35.0314  -141.9895         0.9653575     10.565 TRIG_01275005                 
 
Foreground time interval of the image:
 -1.824  26.160 (delta_t =  27.984 [sec])
Background time interval of the image:
-118.387  -1.824 (delta_t = 116.563 [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 12.160000

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 12.160000

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 12.160000

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   -1.824 sec. to   26.160 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.31928     ( -0.267203   0.26188 )
Norm@50keV  : 2.01003E-03    ( -0.000325349   0.00032534 )
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   56.11     using 59 bins.
 Reduced chi-squared = 0.984386
# Null hypothesis probability of 5.09e-01 with 57 degrees of freedom
 
Photon flux (15-150 keV)    in 27.98 sec: 0.240678 ( -0.040581  0.040772 ) ph/cm2/s
Energy fluence (15-150 keV)             : 5.53257e-07 ( -9.57078e-08  9.64205e-08 ) ergs/cm2

Cutoff power-law model

Time interval is from   -1.824 sec. to   26.160 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 0.419933     ( -1.27725   0.983686 )
Epeak [keV] : 95.4890      ( -31.6993 -95.4821 )
Norm@50keV  : 5.32138E-03    ( -0.00532217   0.0136259 )
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   53.72     using 59 bins.
 Reduced chi-squared = 0.959286
# Null hypothesis probability of 5.62e-01 with 56 degrees of freedom
 
Photon flux (15-150 keV)    in 27.98 sec: 0.232558 ( -0.041834  0.041882 ) ph/cm2/s
Energy fluence (15-150 keV)             : 5.31237e-07 ( -9.86354e-08  9.98626e-08 ) ergs/cm2

Band function

Time interval is from   -1.824 sec. to   26.160 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]    : 18.8003  (-3.31992  4.14107)
R^2/D10^2   : 1.35247E-02  (-0.00668372   0.0128104)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   58.54     using 59 bins.
 Reduced chi-squared = 
# Null hypothesis probability of 4.19e-01 with 57 degrees of freedom
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  2.639e-08   8.986e-09
25- 50  1.260e-07   4.191e-08
50-150  3.266e-07   1.012e-07
15-150  4.789e-07   1.238e-07

Thermal bremsstrahlung (OTTB)

 
 
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT [keV]    : 200.000       (-65.0275      -200)
Norm        : 1.01293       (-0.164813     0.164813)
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   57.12     using 59 bins.
 Reduced chi-squared = 
# Null hypothesis probability of 4.71e-01 with 57 degrees of freedom
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  7.060e-08   4.078e-08
25- 50  1.358e-07   7.685e-08
50-150  2.979e-07   1.661e-07
15-150  5.043e-07   2.825e-07

Double BB

 
 
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT1 [keV]   : 6.37573        (-2.38481      3.78809)
R1^2/D10^2  : 0.261390        (-0.212476      0.934405)
kT2 [keV]   : 24.2729        (-5.54378      10.3822)
R2^2/D10^2  : 4.91564E-03    (-0.00352202   0.00721972)
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   51.45     using 59 bins.
 Reduced chi-squared = 
# Null hypothesis probability of 6.11e-01 with 55 degrees of freedom
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  5.718e-08   3.356e-08
25- 50  1.285e-07   6.925e-08
50-150  3.559e-07   2.009e-07
15-150  5.416e-07   2.900e-07

Peak spectrum fit

Power-law model

Time interval is from    8.888 sec. to    9.888 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.24983     ( -0.522468   0.483173 )
Norm@50keV  : 5.10991E-03    ( -0.00173475   0.00172901 )
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   64.12     using 59 bins.
 Reduced chi-squared = 1.12491
# Null hypothesis probability of 2.41e-01 with 57 degrees of freedom
 
Photon flux (15-150 keV)    in 1 sec: 0.604118 ( -0.212708  0.216064 ) ph/cm2/s
Energy fluence (15-150 keV)             : 5.11635e-08 ( -1.77232e-08  1.79034e-08 ) ergs/cm2

Cutoff power-law model

Time interval is from    8.888 sec. to    9.888 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.82019     ( -7.58462   2.78642 )
Epeak [keV] : 63.8289      ( -16.3918 77.5755 )
Norm@50keV  : 0.161638    ( -0.200615   864.772 )
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   59.97     using 59 bins.
 Reduced chi-squared = 1.07089
# Null hypothesis probability of 3.34e-01 with 56 degrees of freedom
 
Photon flux (15-150 keV)    in 1 sec: 0.570559 ( -0.204505  0.215094 ) ph/cm2/s
Energy fluence (15-150 keV)             : 4.52262e-08 ( -1.70955e-08  1.86354e-08 ) ergs/cm2

Band function

Time interval is from    8.888 sec. to    9.888 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]    : 16.7054  (-4.22647  6.42577)
R^2/D10^2   : 5.79071E-02  (-0.0579071   0.102078)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   60.10     using 59 bins.
 Reduced chi-squared = 
# Null hypothesis probability of 3.64e-01 with 57 degrees of freedom
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  3.307e-09   2.108e-09
25- 50  1.443e-08   8.660e-09
50-150  2.858e-08   1.983e-08
15-150  4.631e-08   2.974e-08

Thermal bremsstrahlung (OTTB)

 
 
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT [keV]    : 199.363       (-112.321      -199.363)
Norm        : 2.60872       (-0.883421     0.883449)
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   64.36     using 59 bins.
 Reduced chi-squared = 
# Null hypothesis probability of 2.35e-01 with 57 degrees of freedom
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  6.496e-09   4.217e-09
25- 50  1.250e-08   8.115e-09
50-150  2.741e-08   1.734e-08
15-150  4.640e-08   2.906e-08

Double BB

 
 
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT1 [keV]   : 199.924        (-199.924      -199.924)
R1^2/D10^2  : 1.22929E-05        (-1.22929e-05      -1.22929e-05)
kT2 [keV]   : 16.0742        (-16.0742      6.96662)
R2^2/D10^2  : 6.39354E-02    (-0.0639354   0.0951793)
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   60.07     using 59 bins.
 Reduced chi-squared = 
# Null hypothesis probability of 2.97e-01 with 55 degrees of freedom
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  3.349e-09   8.310e-06
25- 50  1.443e-08   7.710e-05
50-150  2.875e-08   1.788e-03
15-150  4.652e-08   1.664e-03

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: 1.31928     ( -0.267203   0.26188 )
Norm@50keV  : 2.01003E-03    ( -0.000325349   0.00032534 )
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   56.11     using 59 bins.
 Reduced chi-squared = 
# Null hypothesis probability of 5.09e-01 with 57 degrees of freedom
 
Photon flux (15-150 keV)    in 27.98 sec: 0.240675 ( -0.0405792  0.0407703 ) ph/cm2/s
Energy fluence (15-150 keV)             : 5.53187e-07 ( -9.56874e-08  9.64823e-08 ) ergs/cm2

Cutoff power-law model

Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 0.420405     ( -1.27714   0.983801 )
Epeak [keV] : 95.5162      ( -31.5911 -95.4839 )
Norm@50keV  : 5.31841E-03    ( -0.00532222   0.0136256 )
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   53.72     using 59 bins.
 Reduced chi-squared = 
# Null hypothesis probability of 5.62e-01 with 56 degrees of freedom
 
Photon flux (15-150 keV)    in 27.98 sec: 0.232549 ( -0.041828  0.041861 ) ph/cm2/s
Energy fluence (15-150 keV)             : 5.31455e-07 ( -9.86295e-08  1.00034e-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)  = 1.25e-07
S(50-100 keV) = 1.99e-07

T90 vs. Hardness ratio plot

T90                                   = 23.3519998788834 sec.
Hardness ratio (energy fluence ratio) = 1.592

Color vs. Color plot

Count Ratio  (25-50 keV) / (15-25 keV) = 1.37192
Count Ratio (50-100 keV) / (15-25 keV) = 1.54536

Mask shadow pattern

IMX = -5.523357671686940E-01, IMY = 4.316954955359277E-01

TIME vs. PHA plot around the trigger time

Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 12.160000

TIME vs. DetID plot around the trigger time

Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 12.160000

100 us light curve (15-350 keV)

Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 12.160000

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:
-118.387400 -1.824000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
135.4365 -40.5504    3.5  53.7    5.1   1.5862   3.3    4.2	Vela X-1                      
116.3987  33.7638    3.1  42.3  117.0   3.3018   3.7 ------	UNKNOWN                       
141.0115  50.4746    2.6  41.9  154.0   1.7115   4.4 ------	UNKNOWN                       
179.4252 -38.7922    2.5  54.1  -36.7   4.8443   4.7 ------	UNKNOWN

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

Time interval of the image:
-1.824000 26.160000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
135.6364 -40.5941    9.1  53.7    4.9   0.3002   1.3    5.5	Vela X-1                      
134.7620 -41.0358    2.1  54.4    5.5   1.4292   5.3 ------	UNKNOWN                       
185.6864  29.9859    1.1  35.0 -142.0   0.9653  10.6 ------	UNKNOWN

Post-slew image of 15-350 keV band

Time interval of the image:
129.812590 962.223900
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
186.5769  31.8750    2.9   2.0  177.1   4.0289   4.0 ------	UNKNOWN                       
189.7973  -2.8319    2.5  33.1  -32.2   6.3226   4.7 ------	UNKNOWN

Plot creation:
Fri Jun 20 01:59:32 EDT 2025