batgrbproduct analysis for trigger=1257556

batgrbproduct Analysis for Trigger=1257556

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 Oct 19 14:41:39 EDT 2024
             Host Name: batproc1
   Current Working Dir: /local/data/bat1/alien/Swift_3rdBATcatalog/event/batevent_reproc/trigger1257556
======================================================================

  Trigger: 01257556      Segment: 000

  BAT Trigger Time: 749523057.152   [s; MET]
      Trigger Stop: 749523058.176   [s; MET]
               UTC: 2024-10-02T00:50:22.875360    [includes UTCF correction] 
       Where From?: TDRSS position message

  BAT 
    RA: 140.954765070369   Dec: 39.8542969957009  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    7.55
     Image Trigger?:     NO
     Rate S/N Ratio:     12.0830459735946  [ if not an image trigger ]
     Image S/N Ratio:    7.55

  Flight Position:   [ source = BAT ]
    RA: 140.954765070369   Dec: 39.8542969957009  [deg; J2000]

  Ground Position:   [ source = BAT pre-slew burst ]
    RA: 140.942426622122   Dec: 39.8311057192352  [deg; J2000]  
        { 09h 23m 46.2s , +39d 49' 52.0" }
         +/- 0.967769763197361 [arcmin] (estimated 90% radius based on SNR)
         +/- 0.32162359748843 [arcmin] (formal 1-sigma fit error)
    SNR: 31.8745472201793
 
  Angular difference between Flight and Ground position is 1.503097 arcmin
 
  Partial Coding Fraction: 0.6875    [ including projection effects ]

  Duration
     T90: 43.3039999008179 +/- 4.39230692520438
        Measured from: -16.9879999160767
                   to: 26.3159999847412     [s; relative to TRIGTIME]
     T50: 14.4559999704361 +/- 2.00166830305826
        Measured from: -7.10399997234344
                   to: 7.35199999809265     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: -0.275999903678894     
                   to: 0.724000096321106     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: -21.3359999656677     
                   to: 34.9160000085831     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     1.275678   1.444950   0.790377   0.158888
           0.055340   0.057676   0.048100   0.039248 [error]
 Peak      0.047282   0.067499   0.070198   0.007890
           0.008207   0.008793   0.007541   0.005427 [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 4.47e-07 6.19e-07 6.36e-07 1.19e-06 2.08e-06 2.89e-06   erg/cm2
              Error 3.52e-08 3.04e-08 4.85e-08 1.87e-07 1.12e-07 2.32e-07   erg/cm2
Peak flux Power-law 5.24e-01 5.41e-01 3.93e-01 4.60e-01 1.64e+00 1.92e+00   ph/cm2/s
              Error 1.12e-01 7.40e-02 5.86e-02 1.35e-01 2.12e-01 2.42e-01   ph/cm2/s
 
Fluence   Cutoff-PL 4.18e-07 6.47e-07 6.36e-07 5.91e-07 2.00e-06 2.30e-06   erg/cm2
              Error 4.17e-08 3.88e-08 5.20e-08 3.46e-07 1.30e-07 3.71e-07   erg/cm2
Peak flux Cutoff-PL 4.30e-01 5.83e-01 4.38e-01 2.11e-01 1.59e+00 1.66e+00   ph/cm2/s
              Error 1.37e-01 8.78e-02 7.35e-02 1.56e-01 2.17e-01 2.65e-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    1.965    0.093    -      -           4.01e-03 2.23e-04   58.290 57
CPL   1.507    0.398      49.4   19.0      7.04e-03 3.61e-03   53.990 56
 
 
=== 1-s peak spectral analysis ===
 
Model Ph_index Ph_90err Epeak  Epeak_90err Norm     Nomr_90err chi2   dof
PL    1.458    0.199    -      -           1.33e-02 1.67e-03   50.710 57
CPL   0.519    0.905      84.6   96.5      3.74e-02 4.46e-02   46.780 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: 22.848000 sec.
T50 in the 50-300 keV band: 9.792000 sec.

 
=== Table of the duration information ==
 
        Value   tstart    tstop
T100   56.252  -21.336   34.916
T90    43.304  -16.988   26.316
T50    14.456   -7.104    7.352
Peak    1.000   -0.276    0.724

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
  140.9424    39.8311   0.0060    32.6096   -28.8195         3.3524248     31.875 TRIG_01257556                 
 
Foreground time interval of the image:
-21.336  17.349 (delta_t =  38.685 [sec])
Background time interval of the image:
-239.152 -21.336 (delta_t = 217.816 [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  -21.336 sec. to   34.916 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.96459     ( -0.0925114   0.0943323 )
Norm@50keV  : 4.01006E-03    ( -0.000224116   0.000222135 )
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   58.29     using 59 bins.
 Reduced chi-squared = 1.02263
# Null hypothesis probability of 4.28e-01 with 57 degrees of freedom
 
Photon flux (15-150 keV)    in 56.25 sec: 0.591965 ( -0.030262  0.030325 ) ph/cm2/s
Energy fluence (15-150 keV)             : 2.07717e-06 ( -1.119e-07  1.12619e-07 ) ergs/cm2

Cutoff power-law model

Time interval is from  -21.336 sec. to   34.916 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.50727     ( -0.416161   0.379351 )
Epeak [keV] : 49.4150      ( -11.894 26.057 )
Norm@50keV  : 7.04395E-03    ( -0.00257999   0.00464289 )
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   53.99     using 59 bins.
 Reduced chi-squared = 0.964107
# Null hypothesis probability of 5.51e-01 with 56 degrees of freedom
 
Photon flux (15-150 keV)    in 56.25 sec: 0.576679 ( -0.032622  0.032708 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.99569e-06 ( -1.29212e-07  1.30112e-07 ) ergs/cm2

Band function

Time interval is from  -21.336 sec. to   34.916 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]    : 11.3243  (  )
R^2/D10^2   : 0.166419  (   )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic  : Chi-Squared                  136.75     using 59 bins.
 Reduced chi-squared = 
# Null hypothesis probability of 1.67e-08 with 57 degrees of freedom
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  2.521e-07   2.191e-08
25- 50  7.397e-07   4.162e-08
50-150  5.477e-07   6.421e-08
15-150  1.539e-06   8.803e-08

Thermal bremsstrahlung (OTTB)

 
 
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT [keV]    : 76.8541       (-11.4468      14.7859)
Norm        : 2.77304       (-0.222902     0.246979)
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   54.62     using 59 bins.
 Reduced chi-squared = 
# Null hypothesis probability of 5.65e-01 with 57 degrees of freedom
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  4.036e-07   3.097e-08
25- 50  6.579e-07   3.291e-08
50-150  9.037e-07   1.012e-07
15-150  1.965e-06   1.207e-07

Double BB

 
 
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT1 [keV]   : 5.68665        (-0.998993      1.14905)
R1^2/D10^2  : 1.50956        (-0.719352      1.69588)
kT2 [keV]   : 18.6419        (-2.65197      4.15747)
R2^2/D10^2  : 1.85546E-02    (-0.0105134   0.0170747)
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   57.25     using 59 bins.
 Reduced chi-squared = 
# Null hypothesis probability of 3.91e-01 with 55 degrees of freedom
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  4.082e-07   7.290e-08
25- 50  6.384e-07   8.691e-08
50-150  8.882e-07   2.067e-07
15-150  1.935e-06   3.023e-07

Peak spectrum fit

Power-law model

Time interval is from   -0.276 sec. to    0.724 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.45841     ( -0.198566   0.199964 )
Norm@50keV  : 1.32513E-02    ( -0.00167036   0.00166725 )
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   50.71     using 59 bins.
 Reduced chi-squared = 0.889649
# Null hypothesis probability of 7.08e-01 with 57 degrees of freedom
 
Photon flux (15-150 keV)    in 1 sec: 1.63651 ( -0.21127  0.21175 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.26628e-07 ( -1.7071e-08  1.71591e-08 ) ergs/cm2

Cutoff power-law model

Time interval is from   -0.276 sec. to    0.724 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 0.519422     ( -0.9931   0.817386 )
Epeak [keV] : 84.6473      ( -20.7457 172.16 )
Norm@50keV  : 3.73522E-02    ( -0.0218508   0.0672775 )
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   46.78     using 59 bins.
 Reduced chi-squared = 0.835357
# Null hypothesis probability of 8.05e-01 with 56 degrees of freedom
 
Photon flux (15-150 keV)    in 1 sec: 1.58837 ( -0.21742  0.21685 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.22659e-07 ( -1.75016e-08  1.76224e-08 ) ergs/cm2

Band function

Time interval is from   -0.276 sec. to    0.724 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]    : 17.1860  (-2.29218  2.6306)
R^2/D10^2   : 0.123149  (-0.0486471   0.0799659)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   55.21     using 59 bins.
 Reduced chi-squared = 
# Null hypothesis probability of 5.43e-01 with 57 degrees of freedom
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  7.385e-09   1.780e-09
25- 50  3.296e-08   5.770e-09
50-150  6.974e-08   1.549e-08
15-150  1.101e-07   1.804e-08

Thermal bremsstrahlung (OTTB)

 
 
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT [keV]    : 200.000       (-65.2834      -200)
Norm        : 6.81942       (-0.848367     0.848367)
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   49.40     using 59 bins.
 Reduced chi-squared = 
# Null hypothesis probability of 7.53e-01 with 57 degrees of freedom
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  1.698e-08   9.620e-09
25- 50  3.267e-08   1.817e-08
50-150  7.165e-08   3.983e-08
15-150  1.213e-07   6.800e-08

Double BB

 
 
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT1 [keV]   : 5.56269        (-2.64543      3.50512)
R1^2/D10^2  : 2.80820        (-2.29778      47.185)
kT2 [keV]   : 21.2303        (-3.75866      6.46075)
R2^2/D10^2  : 5.16394E-02    (-0.0338742   0.0571344)
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   44.98     using 59 bins.
 Reduced chi-squared = 
# Null hypothesis probability of 8.30e-01 with 55 degrees of freedom
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  1.465e-08   7.726e-09
25- 50  3.130e-08   1.441e-08
50-150  7.672e-08   3.758e-08
15-150  1.227e-07   4.095e-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: 1.89294     ( -0.0871865   0.0885729 )
Norm@50keV  : 5.29937E-03    ( -0.000273465   0.000271576 )
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   54.02     using 59 bins.
 Reduced chi-squared = 
# Null hypothesis probability of 5.87e-01 with 57 degrees of freedom
 
Photon flux (15-150 keV)    in 38.68 sec: 0.758248 ( -0.0372926  0.0373744 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.88443e-06 ( -9.62919e-08  9.67236e-08 ) ergs/cm2

Cutoff power-law model

Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.47522     ( -0.380844   0.35024 )
Epeak [keV] : 59.3996      ( -11.4119 58.6771 )
Norm@50keV  : 8.76746E-03    ( -0.00295669   0.0050041 )
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   49.82     using 59 bins.
 Reduced chi-squared = 
# Null hypothesis probability of 7.07e-01 with 56 degrees of freedom
 
Photon flux (15-150 keV)    in 38.68 sec: 0.739911 ( -0.040086  0.040173 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.82141e-06 ( -1.09658e-07  1.09917e-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)  = 6.19e-07
S(50-100 keV) = 6.36e-07

T90 vs. Hardness ratio plot

T90                                   = 43.3039999008179 sec.
Hardness ratio (energy fluence ratio) = 1.02746

Color vs. Color plot

Count Ratio  (25-50 keV) / (15-25 keV) = 1.13269
Count Ratio (50-100 keV) / (15-25 keV) = 0.619574

Mask shadow pattern

IMX = 5.605232606910161E-01, IMY = 3.083993593445276E-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:
-239.152000 -21.336000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
254.3938  35.2633    4.6  54.4 -176.4  -2.1376  -2.5    5.7	Her X-1                       
251.1791  30.6222    2.3  57.3 -170.9   6.0928   5.0 ------	UNKNOWN

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

Time interval of the image:
-21.336000 17.348630
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
254.4681  35.4864    5.4  54.3 -176.6  -0.5081  -2.1    8.6	Her X-1                       
238.1610  38.8153    2.6  45.0 -163.8   0.6217   4.4 ------	UNKNOWN                       
140.9424  39.8311    0.4  32.6  -28.8   3.3523  31.9 ------	UNKNOWN

Post-slew image of 15-350 keV band

Time interval of the image:
94.148580 326.348610
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
 96.5130  33.3376    2.3  35.9   61.0   3.6413   5.0 ------	UNKNOWN                       
182.6625  74.4120    2.3  39.5  163.4   2.6198   4.9 ------	UNKNOWN                       
130.7740  36.9354    1.9   8.5   40.3   1.6836   6.0 ------	UNKNOWN

Plot creation:
Sat Oct 19 18:14:19 EDT 2024