batgrbproduct analysis for trigger=1270788

batgrbproduct Analysis for Trigger=1270788

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): Wed Dec 18 16:23:46 EST 2024
             Host Name: batproc1
   Current Working Dir: /local/data/bat1/alien/Swift_3rdBATcatalog/event/batevent_reproc/trigger1270788
======================================================================

  Trigger: 01270788      Segment: 000

  BAT Trigger Time: 754436630.848   [s; MET]
      Trigger Stop: 754436631.872   [s; MET]
               UTC: 2024-11-27T21:43:16.235160    [includes UTCF correction] 
       Where From?: TDRSS position message

  BAT 
    RA: 327.922202326549   Dec: -56.6853428664162  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    12.63
     Image Trigger?:     NO
     Rate S/N Ratio:     12.0415945787923  [ if not an image trigger ]
     Image S/N Ratio:    12.63

  Flight Position:   [ source = BAT ]
    RA: 327.922202326549   Dec: -56.6853428664162  [deg; J2000]

  Ground Position:   [ source = BAT pre-slew burst ]
    RA: 327.904913192801   Dec: -56.6530126446624  [deg; J2000]  
        { 21h 51m 37.2s , -56d 39' 10.8" }
         +/- 1.67466139201442 [arcmin] (estimated 90% radius based on SNR)
         +/- 0.700010636967412 [arcmin] (formal 1-sigma fit error)
    SNR: 14.5620545666467
 
  Angular difference between Flight and Ground position is 2.021823 arcmin
 
  Partial Coding Fraction: 1.015625    [ including projection effects ]

  Duration
     T90: 25.9879999160767 +/- 3.64585245079972
        Measured from: -19.4400000572205
                   to: 6.5479998588562     [s; relative to TRIGTIME]
     T50: 8.42399990558624 +/- 4.93270271836381
        Measured from: -6.89600002765656
                   to: 1.52799987792969     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: 0.0920000076293945     
                   to: 1.09200000762939     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: -20.8320000171661     
                   to: 9.12799990177155     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     0.854499   0.698249   0.103959   0.009262
           0.046563   0.052673   0.049950   0.044181 [error]
 Peak      0.107506   0.112439   0.051163   0.013844
           0.009313   0.010317   0.009458   0.007810 [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 2.69e-07 2.49e-07 1.60e-07 1.57e-07 7.43e-07 8.36e-07   erg/cm2
              Error 2.82e-08 2.66e-08 3.61e-08 6.54e-08 8.36e-08 1.20e-07   erg/cm2
Peak flux Power-law 1.06e+00 7.72e-01 3.75e-01 2.57e-01 2.33e+00 2.46e+00   ph/cm2/s
              Error 1.43e-01 8.16e-02 7.23e-02 9.19e-02 2.39e-01 2.62e-01   ph/cm2/s
 
Fluence   Cutoff-PL 2.56e-07 2.79e-07 1.06e-07 1.04e-08 6.50e-07 6.50e-07   erg/cm2
              Error 3.09e-08 3.43e-08 4.76e-08 2.62e-08 8.28e-08 8.59e-08   erg/cm2
Peak flux Cutoff-PL 1.02e+00 8.40e-01 3.42e-01 7.92e-02 2.26e+00 2.28e+00   ph/cm2/s
              Error 1.52e-01 1.15e-01 1.00e-01 1.55e-01 2.47e-01 2.82e-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    2.642    0.212    -      -           2.38e-03 3.94e-04   62.100 57
CPL   1.079    1.014      19.4   12.6      2.53e-02 9.55e-02   55.070 56
 
 
=== 1-s peak spectral analysis ===
 
Model Ph_index Ph_90err Epeak  Epeak_90err Norm     Nomr_90err chi2   dof
PL    2.044    0.200    -      -           1.52e-02 2.21e-03   51.090 57
CPL   1.314    1.014      34.4   -2.7      4.37e-02 1.32e-01   48.930 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: 0.000000 sec.
T50 in the 50-300 keV band: 0.000000 sec.

 
=== Table of the duration information ==
 
        Value   tstart    tstop
T100   29.960  -20.832    9.128
T90    25.988  -19.440    6.548
T50     8.424   -6.896    1.528
Peak    1.000    0.092    1.092

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
  327.9049   -56.6530   0.0132    11.7816  -178.0595         1.7457008     14.562 TRIG_01270788                 
 
Foreground time interval of the image:
-20.832   9.128 (delta_t =  29.960 [sec])
Background time interval of the image:
-60.848 -20.832 (delta_t =  40.016 [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  -20.832 sec. to    9.128 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 2.64244     ( -0.203156   0.220313 )
Norm@50keV  : 2.37771E-03    ( -0.000390756   0.000396471 )
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   62.10     using 59 bins.
 Reduced chi-squared = 1.08947
# Null hypothesis probability of 2.99e-01 with 57 degrees of freedom
 
Photon flux (15-150 keV)    in 29.96 sec: 0.511092 ( -0.043704  0.043715 ) ph/cm2/s
Energy fluence (15-150 keV)             : 7.43415e-07 ( -8.18211e-08  8.54456e-08 ) ergs/cm2

Cutoff power-law model

Time interval is from  -20.832 sec. to    9.128 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.07937     ( -1.30529   0.721866 )
Epeak [keV] : 19.3976      ( -18.2754 6.92696 )
Norm@50keV  : 2.52724E-02    ( -0.0252763   0.165643 )
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   55.07     using 59 bins.
 Reduced chi-squared = 0.983393
# Null hypothesis probability of 5.10e-01 with 56 degrees of freedom
 
Photon flux (15-150 keV)    in 29.96 sec: 0.487031 ( -0.044612  0.04514 ) ph/cm2/s
Energy fluence (15-150 keV)             : 6.49952e-07 ( -7.60316e-08  8.96391e-08 ) ergs/cm2

Band function

Time interval is from  -20.832 sec. to    9.128 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]    : 6.82149  (-0.647518  0.698447)
R^2/D10^2   : 1.04796  (-0.350768   0.55163)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   64.88     using 59 bins.
 Reduced chi-squared = 
# Null hypothesis probability of 2.21e-01 with 57 degrees of freedom
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  2.283e-07   3.409e-08
25- 50  2.972e-07   4.066e-08
50-150  4.482e-08   1.575e-08
15-150  5.704e-07   6.202e-08

Thermal bremsstrahlung (OTTB)

 
 
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT [keV]    : 26.4858       (-4.94139      6.432)
Norm        : 4.54603       (-0.84411     1.11047)
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   55.25     using 59 bins.
 Reduced chi-squared = 
# Null hypothesis probability of 5.41e-01 with 57 degrees of freedom
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  2.586e-07   2.852e-08
25- 50  2.748e-07   3.183e-08
50-150  1.270e-07   4.650e-08
15-150  6.605e-07   7.595e-08

Double BB

 
 
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT1 [keV]   : 3.19780        (-1.49437      1.71374)
R1^2/D10^2  : 15.7632        (-13.0996      879.159)
kT2 [keV]   : 8.83832        (-1.56914      3.03062)
R2^2/D10^2  : 0.281280    (-0.223618   0.447428)
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   53.93     using 59 bins.
 Reduced chi-squared = 
# Null hypothesis probability of 5.15e-01 with 55 degrees of freedom
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  2.568e-07   1.324e-07
25- 50  2.857e-07   1.516e-07
50-150  9.466e-08   5.710e-08
15-150  6.372e-07   3.204e-07

Peak spectrum fit

Power-law model

Time interval is from    0.092 sec. to    1.092 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 2.04404     ( -0.194017   0.206551 )
Norm@50keV  : 1.51864E-02    ( -0.00223061   0.00219207 )
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   51.09     using 59 bins.
 Reduced chi-squared = 0.896316
# Null hypothesis probability of 6.95e-01 with 57 degrees of freedom
 
Photon flux (15-150 keV)    in 1 sec: 2.32551 ( -0.23848  0.23854 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.40456e-07 ( -1.87309e-08  1.9382e-08 ) ergs/cm2

Cutoff power-law model

Time interval is from    0.092 sec. to    1.092 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.31410     ( -1.19106   0.837091 )
Epeak [keV] : 34.3958      ( -28.9335 -34.3956 )
Norm@50keV  : 4.36945E-02    ( -0.0436996   0.220904 )
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   48.93     using 59 bins.
 Reduced chi-squared = 0.87375
# Null hypothesis probability of 7.37e-01 with 56 degrees of freedom
 
Photon flux (15-150 keV)    in 1 sec: 2.26476 ( -0.24693  0.24802 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.26561e-07 ( -2.24875e-08  2.47638e-08 ) ergs/cm2

Band function

Time interval is from    0.092 sec. to    1.092 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]    : 8.05380  (-0.901977  1.0456)
R^2/D10^2   : 2.49564  (-0.946005   1.48412)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   59.10     using 59 bins.
 Reduced chi-squared = 
# Null hypothesis probability of 3.99e-01 with 57 degrees of freedom
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  2.942e-08   5.005e-09
25- 50  5.209e-08   7.200e-09
50-150  1.398e-08   4.812e-09
15-150  9.548e-08   1.285e-08

Thermal bremsstrahlung (OTTB)

 
 
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT [keV]    : 54.7080       (-15.4441      23.4471)
Norm        : 12.7606       (-1.29777     1.29777)
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   48.84     using 59 bins.
 Reduced chi-squared = 
# Null hypothesis probability of 7.70e-01 with 57 degrees of freedom
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  3.154e-08   4.705e-09
25- 50  4.661e-08   1.364e-08
50-150  4.900e-08   2.828e-08
15-150  1.271e-07   4.666e-08

Double BB

 
 
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT1 [keV]   : 6.32040        (-1.09358      1.18453)
R1^2/D10^2  : 5.34026        (-2.4037      3.69)
kT2 [keV]   : 24.7255        (-9.02167      25.932)
R2^2/D10^2  : 1.99052E-02    (-0.0180149   0.0941651)
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   43.36     using 59 bins.
 Reduced chi-squared = 
# Null hypothesis probability of 8.72e-01 with 55 degrees of freedom
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  3.256e-08   9.645e-09
25- 50  4.591e-08   1.541e-08
50-150  5.828e-08   3.336e-08
15-150  1.368e-07   5.157e-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: 2.64244     ( -0.203156   0.220313 )
Norm@50keV  : 2.37771E-03    ( -0.000390756   0.000396471 )
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   62.10     using 59 bins.
 Reduced chi-squared = 
# Null hypothesis probability of 2.99e-01 with 57 degrees of freedom
 
Photon flux (15-150 keV)    in 29.96 sec: 0.511008 ( -0.0436982  0.0437092 ) ph/cm2/s
Energy fluence (15-150 keV)             : 7.43215e-07 ( -8.17941e-08  8.54984e-08 ) ergs/cm2

Cutoff power-law model

Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.07933     ( -1.30527   0.724954 )
Epeak [keV] : 19.3979      ( -18.2174 6.92683 )
Norm@50keV  : 2.52738E-02    ( -0.025277   0.165643 )
------------------------------------------------------------
#Fit statistic  : Chi-Squared                   55.07     using 59 bins.
 Reduced chi-squared = 
# Null hypothesis probability of 5.10e-01 with 56 degrees of freedom
 
Photon flux (15-150 keV)    in 29.96 sec: 0.486877 ( -0.044579  0.045107 ) ph/cm2/s
Energy fluence (15-150 keV)             : 6.5e-07 ( -7.60235e-08  8.95864e-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)  = 2.49e-07
S(50-100 keV) = 1.60e-07

T90 vs. Hardness ratio plot

T90                                   = 25.9879999160767 sec.
Hardness ratio (energy fluence ratio) = 0.64257

Color vs. Color plot

Count Ratio  (25-50 keV) / (15-25 keV) = 0.817144
Count Ratio (50-100 keV) / (15-25 keV) = 0.121661

Mask shadow pattern

IMX = -2.084561767038293E-01, IMY = 7.062541447758889E-03

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:
-60.848000 -20.832000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
275.9963 -30.5009   38.3  40.8  -77.5   0.2331   0.3    8.8	H1820-303                     
284.9004 -24.8379   52.6  38.2  -62.8  -0.0866  -0.2    8.9	HT1900.1-2455                 
345.8896 -14.8719    2.5  34.8   45.8   1.5057   4.7 ------	UNKNOWN                       
330.2406 -18.4470    2.8  26.9   19.6   0.8980   4.1 ------	UNKNOWN                       
 96.9967 -78.9781    2.1  52.9  178.8   3.5419   5.5 ------	UNKNOWN                       
297.6690   3.8331    2.2  54.7  -25.4   3.4731   5.2 ------	UNKNOWN

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

Time interval of the image:
-20.832000 9.128000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
275.8403 -30.2839  158.2  41.1  -77.4   0.0412   0.1    6.6	H1820-303                     
285.0418 -24.9205  278.0  38.0  -62.8  -0.0120  -0.0    0.3	HT1900.1-2455                 
327.9049 -56.6530    0.8  11.8 -178.1   1.7452  14.6 ------	UNKNOWN

Post-slew image of 15-350 keV band

Time interval of the image:
54.852600 639.352590
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
186.6516 -62.8026    7.2  56.8 -152.8   8.6373   1.6    1.9	GX 301-2                      
264.8612 -44.3726    4.6  40.3  -92.9  -9.5328  -2.5    6.9	4U 1735-44                    
284.8764 -25.0123    5.8  44.2  -55.4  -7.2473  -2.0   10.3	HT1900.1-2455                 
339.5995 -13.5962    2.6  44.0   23.6   6.2636   4.4 ------	UNKNOWN                       
306.9126  -0.7944    2.5  58.4  -17.7  13.0109   4.7 ------	UNKNOWN                       
280.9980 -27.0789    2.6  44.4  -61.2  18.7804   4.4 ------	UNKNOWN

Plot creation:
Wed Dec 18 17:40:12 EST 2024