GRB050726

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: Wed Jan 22 21:15:32 EST 2014
             Host Name: batevent1
   Current Working Dir: /local/data/batevent/batevent_reproc/trigger147788
======================================================================

  Trigger: 00147788      Segment: 000

  BAT Trigger Time: 144046817.472   [s; MET]
      Trigger Stop: 144046825.664   [s; MET]
               UTC: 2005-07-26T05:00:17.830940    [includes UTCF correction] 
       Where From?: TDRSS position message

  BAT 
    RA: 200.0645009276   Dec: -32.0902643464852  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    8.32
     Image Trigger?:     NO
     Rate S/N Ratio:     23.6220236220354  [ if not an image trigger ]
     Image S/N Ratio:    8.32

  Analysis Position:   [ source = BAT ]
    RA: 200.0645009276   Dec: -32.0902643464852  [deg; J2000]

  Refined Position:   [ source = BAT pre-slew burst ]
    RA: 200.024698653156   Dec: -32.0650230988855  [deg; J2000]  
        { 13h 20m 05.9s , -32d 03' 54.1" }
         +/- 1.83462844390184 [arcmin] (estimated 90% radius based on SNR)
         +/- 0.807735993172336 [arcmin] (formal 1-sigma fit error)
    SNR: 12.782654839646
 
  Angular difference between the analysis and refined position is 2.527516 arcmin
 
  Partial Coding Fraction: 0.1484375    [ including projection effects ]

  Duration
     T90: 46.4959999918938 +/- 14.4479756449802
        Measured from: -36.2560000121593
                   to: 10.2399999797344     [s; relative to TRIGTIME]
     T50: 18.1599999666214 +/- 7.76318286192033
        Measured from: -11.8400000035763
                   to: 6.31999996304512     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: 1.06000000238419     
                   to: 2.06000000238419     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: -40.8320000171661     
                   to: 15.6319999992847     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     0.457776   0.685302   0.968075   0.329667
           0.102531   0.098294   0.085572   0.071373 [error]
 Peak      0.026112   0.064915   0.058704   0.013792
           0.014207   0.014402   0.014197   0.010403 [error]

     [ fluence units of on-axis counts / fully illuminated detector ] 

======================================================================
 
 
====== Table of the duration information =============================
 
        Value   tstart    tstop
T100   56.464  -40.832   15.632
T90    46.496  -36.256   10.240
T50    18.160  -11.840    6.320
Peak    1.000    1.060    2.060
 
 
====== Spectral Analysis Summary =====================================
 
Model      : spectral model: simple power-law (PL) and cutoff power-law (CPL)
Ph_index   : photon index: E^{Ph_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 both the PL model and CPL model
Nomr_90err : 90% error of the normalization
chi2       : Chi-Squared
dof        : degree of freedo
 
=== Time-averaged spectral analysis ===
(Best model with acceptable fit: PL)
 
Model Ph_index Ph_90err_low Ph_90err_hi  Epeak  Epeak_90err_low  Epeak_90err_hi  Norm       Nomr_90err_low    Norm_90err_hi    chi2    dof
PL      -0.883    -0.198      0.210       -           -               -         3.08e-03     -3.83e-04          3.75e-04      65.950   57
CPL     -0.274    -0.610      1.053      184.037      N/A           N/A         5.26e-03        N/A               N/A         64.470   56
 
 
=== 1-s peak spectral analysis ===
(Best model with acceptable fit: PL)
 
Model Ph_index Ph_90err_low Ph_90err_hi  Epeak  Epeak_90err_low  Epeak_90err_hi  Norm       Nomr_90err_low    Norm_90err_hi    chi2    dof
PL      -1.061     -0.419     0.457       -           -               -         1.18e-02     -3.05e-03          2.97e-03      63.780   57
CPL     -1.060     -0.418     0.465     9999.360    -9999.360      -9999.360      1.19e-02     -1.55e-03          4.33e-02      63.780   56
 
 
=== 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         PL   1.25e-07  3.36e-07  7.28e-07  4.12e-06  1.96e-06  5.31e-06   erg/cm2
      90%_error_low -3.17e-08 -5.45e-08 -7.95e-08 -9.69e-07 -2.14e-07 -9.95e-07   erg/cm2
      90%_error_hi   3.55e-08  5.41e-08  7.93e-08  1.19e-06  2.14e-07  1.18e-06   erg/cm2
Peak flux       PL   3.20e-01  4.19e-01  4.01e-01  6.83e-01  1.37e+00  1.82e+00   ph/cm2/s
      90%_error_low -1.53e-01 -1.40e-01 -1.02e-01 -3.10e-01 -3.60e-01 -4.50e-01   ph/cm2/s
      90%_error_hi   1.87e-01  1.35e-01  1.01e-01  4.42e-01  3.64e-01  4.61e-01   ph/cm2/s
 
Fluence        CPL   1.01e-07  3.36e-07  7.80e-07  2.25e-06  1.93e-06  3.47e-06   erg/cm2
      90%_error_low -4.11e-08 -5.95e-08 -1.06e-07 -1.18e-06 -2.24e-07 -1.18e-06   erg/cm2
      90%_error_hi   4.74e-08  5.82e-08  1.09e-07  2.22e-06  2.21e-07  2.08e-06   erg/cm2
Peak flux      CPL   3.23e-01  4.19e-01  4.01e-01  6.82e-01  1.37e+00  1.83e+00   ph/cm2/s
      90%_error_low -1.84e-01 -1.04e-01 -1.02e-01 -6.82e-01 -3.61e-01 -6.65e-01   ph/cm2/s
      90%_error_hi   1.40e-01  1.42e-01  1.28e-01  4.35e-01  3.63e-01  4.39e-01   ph/cm2/s
 
======================================================================

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
  200.0247   -32.0650   0.0150    39.9949  -113.2832         2.7383070     12.783 TRIG_00147788                 
 
Foreground time interval of the image:
-40.832  15.632 (delta_t =  56.464 [sec])
Background time interval of the image:
-299.472 -40.832 (delta_t = 258.640 [sec])

Light Curves

Note: The mask-weighted lightcurves have units of either count/det or counts/sec/det, where a det is 0.4 x 0.4 = 0.16 sq cm.

Full-time range; 1 s binning

Bokeh Plot

Other quick-look light curves:

64 ms binning (zoomed)
16 ms binning (zoomed)
8 ms binning (zoomed)
2 ms binning (zoomed)
SN=5 or 10 s binning (full-time range)
Raw light curve

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  -40.832 sec. to   15.632 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -0.883089     ( -0.197988   0.210093 )
Norm@50keV  : 3.07608E-03    ( -0.000382823   0.000374532 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          65.95 using 59 PHA bins.
# Reduced chi-squared =          1.157 for     57 degrees of freedom 
# Null hypothesis probability =   1.949553e-01
 
Photon flux (15-150 keV)    in 56.46 sec: 0.353033 ( -0.043119  0.043708 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.96223e-06 ( -2.13994e-07  2.14227e-07 ) ergs/cm2

Cutoff power-law model

Time interval is from  -40.832 sec. to   15.632 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -0.273843     ( -0.610278   1.05259 )
Epeak [keV] : 184.037      (   )
Norm@50keV  : 5.26183E-03    (     )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          64.47 using 59 PHA bins.
# Reduced chi-squared =          1.151 for     56 degrees of freedom 
# Null hypothesis probability =   2.045038e-01
 
Photon flux (15-150 keV)    in 56.46 sec: 0.341373 ( -0.045527  0.046393 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.93046e-06 ( -2.23625e-07  2.2099e-07 ) ergs/cm2

1-s peak spectrum fit

Power-law model

Time interval is from    1.060 sec. to    2.060 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.06142     ( -0.418868   0.457469 )
Norm@50keV  : 1.18286E-02    ( -0.00305293   0.00297168 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          63.78 using 59 PHA bins.
# Reduced chi-squared =          1.119 for     57 degrees of freedom 
# Null hypothesis probability =   2.503136e-01
 
Photon flux (15-150 keV)    in 1 sec: 1.36736 ( -0.35986  0.36447 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.25248e-07 ( -3.13406e-08  3.13874e-08 ) ergs/cm2

Cutoff power-law model

Time interval is from    1.060 sec. to    2.060 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.05974     ( -0.419104   0.46397 )
Epeak [keV] : 9999.36      ( -9999.36 -9999.36 )
Norm@50keV  : 1.18988E-02    ( -0.00154114   0.0432672 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          63.78 using 59 PHA bins.
# Reduced chi-squared =          1.139 for     56 degrees of freedom 
# Null hypothesis probability =   2.217678e-01
 
Photon flux (15-150 keV)    in 1 sec: 1.36838 ( -0.36145  0.36301 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.25282e-07 ( -3.17264e-08  3.09248e-08 ) ergs/cm2

Time-resolved spectra

Distribution

T90 vs. Hardness ratio plot

T90                                   = 46.496 sec.
Hardness ratio (energy fluence ratio) = 2.16880215455

S(15-50 keV) vs. S(50-150 keV) plot

S(15-50 keV)  = 4.605232e-07
S(50-150 keV) = 1.5017327e-06

The dash-dotted line and the dashed line traces the fluences calculated from the Band function with Epeak = 15 and 150 keV, respectively. Both lines assume a canonical values of alpha = -1 and beta = -2.5.

Mask shadow pattern

 IMX = -3.316159402810754E-01,

Spacecraft aspect plot

Bright

Pre-burst

 Time interval of the image: -299.472000 -40.832000

# RAcent #  [deg] 186.5875 -62.7605 244.9803 -15.6449 256.0002 -37.8312 256.3818 -36.4593 263.0204 -24.8838 264.6555 -44.5241 268.3878  -1.5044 270.3415 -25.0364 270.2053 -25.7436 273.8598 -14.0798 275.7775 -30.5275 284.9280 -24.9264 262.8178 -33.9907 263.9226 -17.3030 251.4538 -45.6188 250.8211  29.4530 183.7893 -49.7585 206.1042 -10.3397 194.9355 -33.9073

Pre-slew

 Time interval of the image: -40.832000 15.632000

# RAcent #  [deg] 186.7086 -62.7682 244.9363 -15.4857 256.1735 -37.8619 256.6197 -36.4401 262.9617 -24.7775 264.8426 -44.5863 268.4753  -1.3194 270.4489 -25.0652 270.3718 -25.6739 273.8554 -14.0485 275.9161 -30.3221 284.9455 -24.8124 263.0451 -33.6857 272.0830  -1.8915 240.4815  21.3600 214.0982 -11.4012 200.0247 -32.0650

Post-slew

 Time interval of the image: 108.828590 302.577900

# RAcent #  [deg] 135.5400 -40.6114 170.6837 -60.6228 186.5152 -62.6427 244.9690 -15.6360 242.3816 -72.8113 235.1686 -12.4912 231.8839 -40.6145 228.3617   2.0218 164.4030 -43.1352 132.5305 -39.8684

IMY = 7.706268201810363E-01 source in the pre-burst/pre-slew/post-slew images

image of 15-350 keV band DECcent POSerr Theta Phi PeakCts SNR AngSep Name [deg] ['] [deg] [deg] ['] 8.3 51.9 -155.1 0.7371 1.4 2.0 GX 301-2 0.2 11.9 -10.7 8.9692 47.9 0.3 Sco X-1 0.9 13.2 138.6 2.4235 13.0 1.0 4U 1700-377 2.5 12.4 133.2 0.8611 4.6 3.4 GX 349+2 11.8 15.3 78.7 0.2029 1.0 8.3 GX 1+4 2.7 22.5 138.6 0.9915 4.3 5.8 4U 1735-44 1.2 33.6 37.8 3.1693 10.0 3.3 SW J1753.5-0127 2.0 21.8 83.7 1.2897 5.7 4.0 GX 5-1 3.1 21.5 85.5 0.8173 3.8 5.3 GRS 1758-258 18.1 29.1 62.9 -0.1874 -0.6 8.9 GX 17+2 0.0 26.0 98.5 0.4367 1.7 12.3 H1820-303 4.8 34.7 89.5 1.1010 2.4 5.9 HT1900.1-2455 0.0 15.7 113.2 -0.3314 -1.5 12.7 GX 354-0 3.4 19.3 56.5 0.7158 3.4 ------ UNKNOWN 2.4 18.6 163.1 0.8916 4.8 ------ UNKNOWN 2.1 57.2 -0.4 6.3394 5.5 ------ UNKNOWN 3.2 51.8 -138.5 4.4136 3.7 ------ UNKNOWN 3.4 41.4 -78.6 3.3516 3.5 ------ UNKNOWN 3.3 44.1 -116.7 3.3035 3.5 ------ UNKNOWN background subtracted image of 15-350 keV band DECcent POSerr Theta Phi PeakCts SNR AngSep Name [deg] ['] [deg] [deg] ['] 69.6 51.9 -155.2 0.0340 0.2 1.4 GX 301-2 6.4 12.1 -10.9 0.1317 1.8 9.6 Sco X-1 5.6 13.3 138.2 0.1546 2.1 8.9 4U 1700-377 6.3 12.6 132.6 0.1283 1.8 9.0 GX 349+2 4.1 15.3 78.2 -0.2317 -2.8 3.2 GX 1+4 46.6 22.7 138.5 -0.0218 -0.2 9.2 4U 1735-44 5.4 33.8 37.8 0.2600 2.1 10.3 SW J1753.5-0127 9.9 21.9 83.9 -0.1150 -1.2 9.0 GX 5-1 41.0 21.7 85.4 -0.0290 -0.3 5.6 GRS 1758-258 60.9 29.1 62.8 0.0231 0.2 8.8 GX 17+2 49.4 26.1 98.1 -0.0277 -0.2 2.7 H1820-303 64.6 34.8 89.3 0.0329 0.2 8.1 HT1900.1-2455 7.5 15.8 111.9 -0.1263 -1.5 9.4 GX 354-0 2.1 35.7 43.3 0.7461 5.6 ------ UNKNOWN 2.2 49.2 -12.2 0.8237 5.1 ------ UNKNOWN 2.7 34.1 -73.4 0.5623 4.3 ------ UNKNOWN 0.9 40.0 -113.3 2.7384 12.8 ------ UNKNOWN image of 15-350 keV band DECcent POSerr Theta Phi PeakCts SNR AngSep Name [deg] ['] [deg] [deg] ['] 8.2 51.5 -143.5 0.7900 1.4 3.4 Vela X-1 4.2 34.4 -179.4 -0.4362 -2.8 10.8 Cen X-3 3.4 31.8 167.2 0.5671 3.4 8.6 GX 301-2 1.0 43.8 54.3 6.4509 11.7 0.7 Sco X-1 2.0 46.2 139.4 2.9147 5.7 ------ UNKNOWN 2.9 37.6 42.2 1.0882 4.0 ------ UNKNOWN 2.4 26.8 93.0 0.9799 4.8 ------ UNKNOWN 2.8 43.4 19.0 1.1096 4.1 ------ UNKNOWN 2.7 30.1 -146.4 0.6341 4.3 ------ UNKNOWN 3.4 53.9 -143.2 3.1122 3.4 ------ UNKNOWN

Analysis Summary

Notes:

Image

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

Light Curves

Full-time range; 1 s binning

Other quick-look light curves:

64 ms binning (zoomed) 16 ms binning (zoomed) 8 ms binning (zoomed) 2 ms binning (zoomed) SN=5 or 10 s binning (full-time range) Raw light curve

Spectra

Notes:

Time averaged spectrum fit using the average DRM

Power-law model

Cutoff power-law model

1-s peak spectrum fit

Power-law model

Cutoff power-law model

Time-resolved spectra

Distribution

T90 vs. Hardness ratio plot

S(15-50 keV) vs. S(50-150 keV) plot

Mask shadow pattern

Spacecraft aspect plot

Bright

64 ms binning (zoomed)
16 ms binning (zoomed)
8 ms binning (zoomed)
2 ms binning (zoomed)
SN=5 or 10 s binning (full-time range)
Raw light curve