batgrbproduct analysis for trigger=235645

batgrbproduct Analysis for Trigger=235645

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 v2.46
    Process Start Time (local time): Wed Jan 22 12:23:46 EST 2014
             Host Name: batevent1
   Current Working Dir: /local/data/batevent/batevent_reproc/trigger235645
======================================================================

  Trigger: 00235645      Segment: 000

  BAT Trigger Time: 183636904   [s; MET]
      Trigger Stop: 183636968   [s; MET]
               UTC: 2006-10-27T10:15:02.467300    [includes UTCF correction] 
       Where From?: TDRSS position message

  BAT 
    RA: 270.812052997813   Dec: -82.2277921845646  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    7.05
     Image Trigger?:     YES
     Rate S/N Ratio:     0  [ if not an image trigger ]
     Image S/N Ratio:    7.05

  Flight Position:   [ source = BAT ]
    RA: 270.812052997813   Dec: -82.2277921845646  [deg; J2000]

  Ground Position:   [ source = BAT pre-slew burst ]
    RA: 270.876072063455   Dec: -82.2402372749646  [deg; J2000]  
        { 18h 03m 30.3s , -82d 14' 24.9" }
         +/- 3.75758102512687 [arcmin] (estimated 90% radius based on SNR)
         +/- 3.15438887243402 [arcmin] (formal 1-sigma fit error)
    SNR: 4.59008503509723
 
  Angular difference between Flight and Ground position is 0.909382 arcmin
 
  Partial Coding Fraction: 0.6875    [ including projection effects ]

  Duration
     T90: N/A +/- N/A
        Measured from: N/A
                   to: N/A     [s; relative to TRIGTIME]
     T50: N/A +/- N/A
        Measured from: N/A
                   to: N/A     [s; relative to TRIGTIME]

    WARNING: battblocks failed.  Used TDRSS fore/background intervals

======================================================================
 
=== 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 5.76e-08 8.37e-08 9.07e-08 1.84e-07 2.89e-07 4.15e-07   erg/cm2
              Error 2.20e-08 2.37e-08 3.87e-08 1.56e-07 9.44e-08 2.00e-07   erg/cm2
Peak flux Power-law -------- -------- -------- -------- -------- --------   ph/cm2/s
              Error -------- -------- -------- -------- -------- --------   ph/cm2/s
 
Fluence   Cutoff-PL 5.17e-08 1.06e-07 7.28e-08 1.07e-08 2.40e-07 2.41e-07   erg/cm2
              Error 2.33e-08 3.59e-08 6.45e-08 9.44e-08 1.09e-07 1.54e-07   erg/cm2
Peak flux Cutoff-PL -------- -------- -------- -------- -------- --------   ph/cm2/s
              Error -------- -------- -------- -------- -------- --------   ph/cm2/s
 
Fluence        Band 5.14e-08 1.06e-07 7.36e-08 1.15e-08 2.42e-07 2.43e-07   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    1.883    0.467    -      -           4.91e-04 1.61e-04   68.260 57
CPL  -0.141    0.954      41.0    0.0      8.12e-03 0.00e+00   65.400 56
 
 
(1-s peak spectrum is not available)
 
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     N/A      N/A     N/A
T90      N/A      N/A     N/A
T50      N/A      N/A     N/A
Peak     N/A      N/A     N/A

Click here for the BAT GCN circular template

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
  270.8761   -82.2402   0.0418    35.1733  -156.5944         0.4270291      4.590 TRIG_00235645                 
 
Foreground time interval of the image:
  0.000  64.000 (delta_t =  64.000 [sec])
Background time interval of the image:

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 64.000000

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 64.000000

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 64.000000

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    0.000 sec. to   64.000 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: 1.88318     ( -0.447071   0.487721 )
Norm@50keV  : 4.90585E-04    ( -0.000163138   0.000159576 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          68.26 using 59 PHA bins.
# Reduced chi-squared =          1.198 for     57 degrees of freedom 
# Null hypothesis probability =   1.459750e-01
 
Photon flux (15-150 keV)    in 64 sec: 6.99117E-02 ( -0.0198275  0.0198667 ) ph/cm2/s
Energy fluence (15-150 keV)             : 2.88502e-07 ( -9.20838e-08  9.67706e-08 ) ergs/cm2

Cutoff power-law model

Time interval is from    0.000 sec. to   64.000 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -0.140931     ( 0.159712   2.0675 )
Epeak [keV] : 40.9758      (   )
Norm@50keV  : 8.11827E-03    (     )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          65.40 using 59 PHA bins.
# Reduced chi-squared =          1.168 for     56 degrees of freedom 
# Null hypothesis probability =   1.827731e-01
 
Photon flux (15-150 keV)    in 64 sec: 6.69542E-02 ( -0.0221959  0.0198116 ) ph/cm2/s
Energy fluence (15-150 keV)             : 2.40477e-07 ( -1.11547e-07  1.06403e-07 ) ergs/cm2

Band function

Time interval is from    0.000 sec. to   64.000 sec.
 
Spectral model in the Band function:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
alpha       : 5.00000   ( -5.08467   -5 )
beta        : -2.79779    ( -2.49162   0.868509 )
Epeak [keV] : 30.1140      ( -7.3562 6.44257 )
Norm@50keV   : 27.2941    ( -7.17738   128.422 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          62.57 using 59 PHA bins.
# Reduced chi-squared =          1.138 for     55 degrees of freedom 
# Null hypothesis probability =   2.254532e-01
 
Photon flux (15-150 keV)    in 64 sec: 6.78280E-02 ( 6.93217  -0.0202959 ) ph/cm2/s
Energy fluence (15-150 keV)             : 2.41593e-07 ( 0  0 ) ergs/cm2

Single BB

 
Spectral model blackbody:
------------------------------------------------------------
Parameters  : value    Lower 90%  Upper 90%
kT [keV]    : 9.37527  (-2.38063  3.73967)
R^2/D10^2   : 4.48003E-02  (-0.0325411   0.094349)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared =          65.90 using 59 PHA bins.
# Reduced chi-squared =          1.156 for     57 degrees of freedom 
# Null hypothesis probability =   1.961088e-01
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  5.004e-08   3.108e-08
25- 50  1.132e-07   6.392e-08
50-150  4.888e-08   3.416e-08
15-150  2.122e-07   1.216e-07

Thermal bremsstrahlung (OTTB)

 
 
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT [keV]    : 70.3497       (-36.4195      -70.3638)
Norm        : 0.353165       (-0.124162     0.190693)
------------------------------------------------------------
#Fit statistic : Chi-Squared =          66.53 using 59 PHA bins.
# Reduced chi-squared =          1.167 for     57 degrees of freedom 
# Null hypothesis probability =   1.818059e-01
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  5.802e-08   3.468e-08
25- 50  9.244e-08   5.453e-08
50-150  1.192e-07   9.849e-08
15-150  2.696e-07   1.820e-07

Double BB

 
 
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters  : value         Lower 90%    Upper 90%
kT1 [keV]   : 7.05456        (-7.0732      4.24927)
R1^2/D10^2  : 9.69363E-02        (-0.0918911      -0.0918911)
kT2 [keV]   : 19.5232        (-20.311      -20.311)
R2^2/D10^2  : 1.43539E-03    (-0.00108177   0.0863116)
------------------------------------------------------------
#Fit statistic : Chi-Squared =          64.12 using 59 PHA bins.
# Reduced chi-squared =          1.166 for     55 degrees of freedom 
# Null hypothesis probability =   1.872328e-01
 
Energy  Fluence     90% Error
[keV]   [erg/cm2]   [erg/cm2]
15- 25  5.681e-08   3.408e-08
25- 50  1.029e-07   5.869e-08
50-150  1.059e-07   7.648e-08
15-150  2.656e-07   1.509e-07

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: 1.88318     ( -0.447071   0.487721 )
Norm@50keV  : 4.90585E-04    ( -0.000163138   0.000159576 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          68.26 using 59 PHA bins.
# Reduced chi-squared =          1.198 for     57 degrees of freedom 
# Null hypothesis probability =   1.459750e-01
 
Photon flux (15-150 keV)    in 64 sec: 6.99117E-02 ( -0.0198275  0.0198667 ) ph/cm2/s
Energy fluence (15-150 keV)             : 2.88502e-07 ( -9.20838e-08  9.67706e-08 ) ergs/cm2

Cutoff power-law model

Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -0.140931     ( 0.159712   2.0675 )
Epeak [keV] : 40.9758      (   )
Norm@50keV  : 8.11827E-03    (     )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          65.40 using 59 PHA bins.
# Reduced chi-squared =          1.168 for     56 degrees of freedom 
# Null hypothesis probability =   1.827731e-01
 
Photon flux (15-150 keV)    in 64 sec: 6.69542E-02 ( -0.0221927  0.0198115 ) ph/cm2/s
Energy fluence (15-150 keV)             : 2.40477e-07 ( -1.11547e-07  1.06403e-07 ) ergs/cm2

Band function

 
Spectral model in the Band function:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
alpha       : 5.00000   ( -5.08467   -5 )
beta        : -2.79779    ( -2.49162   0.868509 )
Epeak [keV] : 30.1140      ( -7.3562 6.44257 )
Norm@50keV   : 27.2941    ( -7.17738   128.422 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          62.57 using 59 PHA bins.
# Reduced chi-squared =          1.138 for     55 degrees of freedom 
# Null hypothesis probability =   2.254532e-01
 
Photon flux (15-150 keV)    in 64 sec: 6.78280E-02 ( 6.93217  -0.0202959 ) ph/cm2/s
Energy fluence (15-150 keV)             : 2.41593e-07 ( 0  0 ) ergs/cm2

S(25-50 keV) vs. S(50-100 keV) plot

S(25-50 keV)  = 8.37e-08
S(50-100 keV) = 9.07e-08

T90 vs. Hardness ratio plot

T90                                   = 64 sec.
Hardness ratio (energy fluence ratio) = 1.08363

Color vs. Color plot

Count Ratio  (25-50 keV) / (15-25 keV) = 1.77382
Count Ratio (50-100 keV) / (15-25 keV) = 0.583288

Mask shadow pattern

IMX = -6.467363073076796E-01, IMY = 2.799426606878527E-01

TIME vs. PHA plot around the trigger time

Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 64.000000

TIME vs. DetID plot around the trigger time

Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 64.000000

100 us light curve (15-350 keV)

Blue+Cyan dotted lines: Time interval of the scaled map
From 0.000000 to 64.000000

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:

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

Time interval of the image:
0.000000 64.000000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
255.9710 -37.8211    1.9  33.9  -72.4   0.9063   6.0    1.6	4U 1700-377                   
256.4749 -36.3916    4.8  34.4  -69.8   0.3593   2.4    2.7	GX 349+2                      
263.1358 -24.7329    2.8  37.8  -48.5   0.5508   4.1    7.0	GX 1+4                        
264.4988 -44.5610    0.0  25.1  -78.6   0.1310   1.4   12.4	4U 1735-44                    
268.3600  -1.3855    5.5  54.6  -24.6   0.5913   2.1    4.1	SW J1753.5-0127               
270.3037 -24.9380  199.9  33.5  -40.1   0.0059   0.1    8.5	GX 5-1                        
270.2530 -25.7221    3.6  32.9  -41.1   0.3233   3.2    3.0	GRS 1758-258                  
274.0216 -14.0482    4.5  40.8  -25.5   0.3110   2.6    1.2	GX 17+2                       
276.0183 -30.3905    3.3  26.1  -39.0   0.3083   3.5    5.0	H1820-303                     
285.1734 -25.0519    8.8  26.3  -16.9   0.1118   1.3   10.9	HT1900.1-2455                 
262.9899 -33.8346   53.8  31.6  -60.2   0.0244   0.2    0.0	GX 354-0                      
 83.1030 -73.4723    2.5  55.5 -175.5   1.4336   4.6 ------	UNKNOWN                       
270.8740 -82.2401    2.5  35.2 -156.6   0.4273   4.6 ------	UNKNOWN

Post-slew image of 15-350 keV band

Time interval of the image:
131.300590 963.097200
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
135.4614 -40.5757   14.0  55.2 -168.4   1.2358   0.8    3.3	Vela X-1                      
170.3430 -60.6189    8.4  31.7 -142.1   0.6992   1.4    0.8	Cen X-3                       
186.7154 -62.6846    3.0  27.5 -128.1   1.8089   3.9    5.4	GX 301-2                      
255.9229 -37.8339    2.1  44.7  -45.7   5.9861   5.6    3.1	4U 1700-377                   
256.6354 -36.4625    7.8  46.0  -44.9   1.7557   1.5    9.9	GX 349+2                      
264.8617 -44.5510    5.0  37.7  -35.9   1.3767   2.3    7.9	4U 1735-44                    
270.2559 -25.0677  105.1  57.1  -29.6   0.2660   0.1    1.7	GX 5-1                        
270.4469 -25.7347    8.6  56.5  -29.4   2.9330   1.3    7.8	GRS 1758-258                  
275.7805 -30.3620    9.3  51.9  -23.5   1.2177   1.2    7.5	H1820-303                     
285.0039 -24.9281    8.3  57.5  -13.7   2.5547   1.4    1.8	HT1900.1-2455                 
263.1752 -33.8555   11.4  48.4  -37.5   1.1284   1.0    9.4	GX 354-0                      
119.7339 -41.3429    2.9  55.6  177.2   9.3284   4.0 ------	UNKNOWN                       
121.8926 -39.8578    4.4  56.9  179.3   8.4536   2.6 ------	UNKNOWN                       
129.3318 -39.0830    5.1  57.2 -173.8   5.2296   2.3 ------	UNKNOWN                       
270.5406 -53.9756    3.4  28.2  -29.3   1.2957   3.4 ------	UNKNOWN                       
137.2527 -36.5415    3.3  59.0 -166.2  11.8306   3.5 ------	UNKNOWN                       
159.8189 -37.8923    5.5  55.2 -145.2   6.6548   2.1 ------	UNKNOWN

Plot creation:
Sun May 31 11:39:25 EDT 2015