batgrbproduct analysis for trigger=1131910

batgrbproduct Analysis for Trigger=1131910

The burst occurred when BAT detectors had some issues.
Thus, data below ~50 keV are incorrect and should not be used in the analysis.
Therefore, products from standard spectral analysis are not included for this burst.
Manual analysis are required for spectral study of this burst.

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 Jun 14 12:14:37 EDT 2023
             Host Name: batproc1
   Current Working Dir: /local/data/bat1/alien/Swift_3rdBATcatalog/event/batevent_reproc/trigger1131910
======================================================================

  Trigger: 01131910      Segment: 000

  BAT Trigger Time: 688655817.792   [s; MET]
      Trigger Stop: 688655818.816   [s; MET]
               UTC: 2022-10-28T13:16:27.675980    [includes UTCF correction] 
       Where From?: TDRSS position message

  BAT 
    RA: 314.205809453804   Dec: 41.0656228856362  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    7.77
     Image Trigger?:     NO
     Rate S/N Ratio:     36.783148315499  [ if not an image trigger ]
     Image S/N Ratio:    7.77

  Flight Position:   [ source = BAT ]
    RA: 314.205809453804   Dec: 41.0656228856362  [deg; J2000]

  Ground Position:   [ source = BAT pre-slew burst ]
    RA: 314.197840780544   Dec: 41.0822047741597  [deg; J2000]  
        { 20h 56m 47.5s , +41d 04' 55.9" }
         +/- 1.55057035365598 [arcmin] (estimated 90% radius based on SNR)
         +/- 0.587144864678102 [arcmin] (formal 1-sigma fit error)
    SNR: 16.2550271703813
 
  Angular difference between Flight and Ground position is 1.058191 arcmin
 
  Partial Coding Fraction: 0.5390625    [ including projection effects ]

  Duration
     T90: 68.3240000009537 +/- 14.8808113864809
        Measured from: 0.6839998960495
                   to: 69.0079998970032     [s; relative to TRIGTIME]
     T50: 22.7279999256134 +/- 11.9450153770926
        Measured from: 8.17199993133545
                   to: 30.8999998569489     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: 0.555999994277954     
                   to: 1.55599999427795     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: -0.0840001106262207     
                   to: 84.0319999456406     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total    -0.001641   0.199369   1.076546   0.388726
           0.003270   0.025409   0.058048   0.049375 [error]
 Peak      0.000136   0.014983   0.074231   0.033223
           0.000380   0.003964   0.009616   0.008942 [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 -------- -------- -------- -------- -------- --------   erg/cm2
              Error -------- -------- -------- -------- -------- --------   erg/cm2
Peak flux Power-law -------- -------- -------- -------- -------- --------   ph/cm2/s
              Error -------- -------- -------- -------- -------- --------   ph/cm2/s
 
Fluence   Cutoff-PL -------- -------- -------- -------- -------- --------   erg/cm2
              Error -------- -------- -------- -------- -------- --------   erg/cm2
Peak flux Cutoff-PL -------- -------- -------- -------- -------- --------   ph/cm2/s
              Error -------- -------- -------- -------- -------- --------   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    0.000    0.000    -      -           0.00e+00 0.00e+00    0.000  0
CPL   0.000    0.000       0.0    0.0      0.00e+00 0.00e+00    0.000  0
 
 
=== 1-s peak spectral analysis ===
 
Model Ph_index Ph_90err Epeak  Epeak_90err Norm     Nomr_90err chi2   dof
PL    0.000    0.000    -      -           0.00e+00 0.00e+00    0.000  0
CPL   0.000    0.000       0.0    0.0      0.00e+00 0.00e+00    0.000  0
 
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: 66.688000 sec.
T50 in the 50-300 keV band: 22.656000 sec.

 
=== Table of the duration information ==
 
        Value   tstart    tstop
T100   84.116   -0.084   84.032
T90    68.324    0.684   69.008
T50    22.728    8.172   30.900
Peak    1.000    0.556    1.556

Click here for the BAT GCN circular template

Estimated redshift from machine learning (Ukwatta et al. 2016) - may take a few minute to calcaulte

Special notes of this burst

Image

Pre-slew 15.0-350.0 keV image (Event data)

#   RAcent    DECcent   POSerr    Theta     Phi              Peak Cts       SNR   Name
  314.1978    41.0822   0.0118    30.6499    55.9527         0.7858426     16.255 TRIG_01131910                 
 
Foreground time interval of the image:
 -0.084  16.709 (delta_t =  16.793 [sec])
Background time interval of the image:
-239.792  -0.084 (delta_t = 239.708 [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

Multiple GTIs in the spectrum
tstart tstop

Cutoff power-law model

Multiple GTIs in the spectrum
tstart tstop

Band function

Multiple GTIs in the spectrum
tstart tstop

Single BB

Thermal bremsstrahlung (OTTB)

Double BB

Peak spectrum fit

Power-law model

Time interval is from    0.556 sec. to    1.556 sec.

Cutoff power-law model

Time interval is from    0.556 sec. to    1.556 sec.

Band function

Time interval is from    0.556 sec. to    1.556 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

 XSPEC: quit
 
 
Spectral model blackbody:
------------------------------------------------------------
Parameters  : value    Lower 90%  Upper 90%
kT [keV]    :   (  )
R^2/D10^2   :   (   )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
 Reduced chi-squared = 
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  0.000e+00   0.000e+00
25- 50  0.000e+00   0.000e+00
50-150  0.000e+00   0.000e+00
15-150  0.000e+00   0.000e+00

Thermal bremsstrahlung (OTTB)

XSPEC12>exit
 XSPEC: quit
 
 
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT [keV]    :        (      )
Norm        :        (     )
------------------------------------------------------------
 Reduced chi-squared = 
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  0.000e+00   0.000e+00
25- 50  0.000e+00   0.000e+00
50-150  0.000e+00   0.000e+00
15-150  0.000e+00   0.000e+00

Double BB

XSPEC12>exit
 XSPEC: quit
 
 
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT1 [keV]   :         (      )
R1^2/D10^2  :         (      )
kT2 [keV]   :         (      )
R2^2/D10^2  :     (   )
------------------------------------------------------------
 Reduced chi-squared = 
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  0.000e+00   0.000e+00
25- 50  0.000e+00   0.000e+00
50-150  0.000e+00   0.000e+00
15-150  0.000e+00   0.000e+00

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: -1.13300     (     )
Norm@50keV  : 5.30740E-04    (     )
------------------------------------------------------------
#Fit statistic  : Chi-Squared                  252.09     using 59 bins.
 Reduced chi-squared = 
# Null hypothesis probability of 2.35e-26 with 57 degrees of freedom
 
Photon flux (15-150 keV)    in 16.79 sec: 0.128616 (    ) ph/cm2/s
Energy fluence (15-150 keV)             : 3.5571e-07 ( 0  0 ) ergs/cm2

Cutoff power-law model

Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.00000     (     )
Epeak [keV] : 50.0000      (   )
Norm@50keV  : 0.0    (     )
------------------------------------------------------------
#Fit statistic  : Chi-Squared                  356.72     using 59 bins.
 Reduced chi-squared = 
# Null hypothesis probability of 2.28e-45 with 56 degrees of freedom
 
Photon flux (15-150 keV)    in 16.79 sec: 0.261283 (    ) ph/cm2/s
Energy fluence (15-150 keV)             : 6.81919e-07 ( 0  0 ) 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)  = --------
S(50-100 keV) = --------

T90 vs. Hardness ratio plot

T90                                   = 68.3240000009537 sec.
Hardness ratio (energy fluence ratio) =

Color vs. Color plot

Count Ratio  (25-50 keV) / (15-25 keV) = -121.492
Count Ratio (50-100 keV) / (15-25 keV) = -656.03

Mask shadow pattern

IMX = 3.317690689505900E-01, IMY = -4.909926022119773E-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:
-239.792000 -0.084000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
254.3247  35.2558   52.5  33.6  -39.8   0.0588   0.2    8.3	Her X-1                       
268.4579  -1.2861    0.0  28.7 -119.4  -0.4371  -1.6   11.4	SW J1753.5-0127               
270.2930 -25.0788  119.5  48.2 -142.3  -0.0439  -0.1    0.5	GX 5-1                        
270.3022 -25.7426   22.1  48.8 -142.7   0.2478   0.5    0.0	GRS 1758-258                  
274.0804 -13.8843 2700.0  36.5 -140.8   0.0004   0.0   10.1	GX 17+2                       
276.0468 -30.3319   10.3  51.5 -150.9  -0.5012  -1.1    6.7	H1820-303                     
285.0978 -24.7626    0.0  44.7 -160.3  -0.3185  -1.0   10.1	HT1900.1-2455                 
288.7978  10.9477  124.8   8.9 -167.8  -0.0152  -0.1    0.1	GRS 1915+105                  
299.6268  35.2199    1.2  18.4   46.3   1.6549   9.4    2.1	Cyg X-1                       
308.3015  40.9561    4.9  27.2   50.2   0.4832   2.4    8.7	Cyg X-3                       
326.1552  38.2716    3.9  37.6   67.9   1.1780   2.9    3.1	Cyg X-2                       
328.2816  29.3423    3.0  37.4   82.9   1.7587   3.8 ------	UNKNOWN                       
315.5224 -24.7450    2.8  51.8  163.7   3.3870   4.1 ------	UNKNOWN

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

Time interval of the image:
-0.084000 16.708600
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
254.5690  35.4644   12.5  33.5  -39.3   0.0442   0.9    9.1	Her X-1                       
268.4058  -1.3022  656.3  28.7 -119.4   0.0008   0.0    9.3	SW J1753.5-0127               
270.1135 -24.9803    3.4  48.1 -142.1  -0.3137  -3.4   11.0	GX 5-1                        
270.2659 -25.6695    5.6  48.7 -142.6  -0.1986  -2.0    4.8	GRS 1758-258                  
273.8510 -14.0222    4.7  36.7 -140.5   0.1330   2.5    9.1	GX 17+2                       
275.9601 -30.3678    7.3  51.5 -150.8  -0.1389  -1.6    1.8	H1820-303                     
285.1402 -24.9388   12.4  44.8 -160.3  -0.0563  -0.9    5.8	HT1900.1-2455                 
288.9615  10.9233    5.1   8.9 -168.8  -0.0762  -2.2    9.7	GRS 1915+105                  
299.4455  35.2997    4.3  18.4   45.8  -0.0943  -2.7    9.2	Cyg X-1                       
308.1375  40.8418    7.1  27.0   50.1   0.0673   1.6    6.8	Cyg X-3                       
326.1810  38.4457    5.7  37.6   67.7  -0.1686  -2.0    7.5	Cyg X-2                       
314.1979  41.0822    0.7  30.6   56.0   0.7858  16.3 ------	UNKNOWN                       
280.3473  67.4211    2.3  47.9   11.6   0.3625   5.2 ------	UNKNOWN                       
305.4127 -33.5640    1.8  55.8  178.4   1.2843   6.2 ------	UNKNOWN

Post-slew image of 15-350 keV band

Time interval of the image:
84.108600 962.308000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
288.7521  11.0750    5.5  37.4 -133.1  -1.9009  -2.1    8.2	GRS 1915+105                  
299.5698  35.2367    1.4  12.9 -109.3   4.5454   8.1    2.3	Cyg X-1                       
307.9177  40.9067   15.1   4.7  -87.0   0.4315   0.8    9.2	Cyg X-3                       
326.0315  38.2938    8.3   9.5  106.0   0.7009   1.4    6.8	Cyg X-2                       
265.3563  58.4029    2.7  34.9  -40.5   3.5086   4.3 ------	UNKNOWN                       
256.0793  51.5429    2.3  40.3  -51.7   6.0202   5.1 ------	UNKNOWN

Plot creation:
Fri Nov  3 17:28:04 EDT 2023