GRB050401

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: Sat May  9 19:57:54 EDT 2015
             Host Name: bat1
   Current Working Dir: /local/data/bat1/alien/Swift_3rdBATcatalog/event/batevent_reproc/trigger113120
======================================================================

  Trigger: 00113120      Segment: 000

  BAT Trigger Time: 134058014.784   [s; MET]
      Trigger Stop: 134058015.808   [s; MET]
               UTC: 2005-04-01T14:20:15.326620    [includes UTCF correction] 
       Where From?: TDRSS position message

  BAT 
    RA: 247.880487633644   Dec: 2.18388293694669  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    10
     Image Trigger?:     NO
     Rate S/N Ratio:     45.3431361950185  [ if not an image trigger ]
     Image S/N Ratio:    10

  Analysis Position:   [ source = BAT ]
    RA: 247.880487633644   Dec: 2.18388293694669  [deg; J2000]

  Refined Position:   [ source = BAT pre-slew burst ]
    RA: 247.873416234551   Dec: 2.1865874476908  [deg; J2000]  
        { 16h 31m 29.6s , +02d 11' 11.7" }
         +/- 1.09595469796366 [arcmin] (estimated 90% radius based on SNR)
         +/- 0.380267607481 [arcmin] (formal 1-sigma fit error)
    SNR: 26.68528249977
 
  Angular difference between the analysis and refined position is 0.453968 arcmin
 
  Partial Coding Fraction: 0.05712891    [ including projection effects ]

  Duration
     T90: 32.0920000076294 +/- 0.577442637323557
        Measured from: -5.12799999117851
                   to: 26.9640000164509     [s; relative to TRIGTIME]
     T50: 25.3960000127554 +/- 0.419237411561389
        Measured from: -0.403999999165535
                   to: 24.9920000135899     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: 24.2719999998808     
                   to: 25.2719999998808     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: -5.90799999237061     
                   to: 27.804000005126     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     2.180863   3.687148   3.654509   1.382127
           0.143108   0.159920   0.147313   0.114201 [error]
 Peak      0.220570   0.439067   0.577215   0.219853
           0.032138   0.040351   0.042019   0.029289 [error]

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

======================================================================
 
 
====== Table of the duration information =============================
 
        Value   tstart    tstop
T100   33.712   -5.908   27.804
T90    32.092   -5.128   26.964
T50    25.396   -0.404   24.992
Peak    1.000   24.272   25.272
 
 
====== 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      -1.388    -0.075      0.075       -           -               -         2.48e-02     -1.09e-03          1.09e-03      55.440   57
CPL     -1.173    -0.248      0.324      223.326    -100.158      -223.326      3.09e-02     -6.75e-03          1.17e-02      54.000   56
 
 
=== 1-s peak spectral analysis ===
(Best model with acceptable fit: CPL)
 
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      -1.143     -0.129     0.131       -           -               -         1.07e-01     -9.12e-03          9.10e-03      71.500   57
CPL     -0.067     -0.599     0.694      107.979     -21.166        59.358      3.12e-01     -1.37e-01          2.87e-01      61.170   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   9.60e-07  1.89e-06  2.89e-06  9.62e-06  8.09e-06  1.54e-05   erg/cm2
      90%_error_low -8.27e-08 -1.00e-07 -1.41e-07 -1.01e-06 -3.61e-07 -1.09e-06   erg/cm2
      90%_error_hi   8.53e-08  9.95e-08  1.41e-07  1.08e-06  3.61e-07  1.14e-06   erg/cm2
Peak flux       PL   4.41e-04  5.40e-03  6.02e-02  5.85e+00  2.70e-01  5.85e+00   ph/cm2/s
      90%_error_low -1.24e-06 4.37e-05 1.39e-03 -4.95e-01 8.73e-03 -4.35e-01   ph/cm2/s
      90%_error_hi   2.49e-04  2.81e-03  2.88e-02  1.30e+00  1.25e-01  1.42e+00   ph/cm2/s
 
Fluence        CPL   9.10e-07  1.92e-06  2.96e-06  7.44e-06  8.04e-06  1.32e-05   erg/cm2
      90%_error_low -1.06e-07 -1.08e-07 -1.78e-07 -2.20e-06 -3.70e-07 -2.18e-06   erg/cm2
      90%_error_hi   1.10e-07  1.09e-07  1.80e-07  2.09e-06  3.69e-07  2.57e-06   erg/cm2
Peak flux      CPL   2.32e+00  4.11e+00  4.12e+00  2.68e+00  1.22e+01  1.32e+01   ph/cm2/s
      90%_error_low -5.96e-01 -4.62e-01 -4.41e-01 -8.53e-01 -1.12e+00 -1.43e+00   ph/cm2/s
      90%_error_hi   6.46e-01  4.63e-01  4.50e-01  1.28e+00  1.12e+00  1.63e+00   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
  247.8734     2.1866   0.0072    55.6708     5.6150         8.8356351     26.685 TRIG_00113120                 
 
Foreground time interval of the image:
 -5.908  25.317 (delta_t =  31.225 [sec])
Background time interval of the image:
-299.784  -5.908 (delta_t = 293.876 [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   -5.908 sec. to   27.804 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.38848     ( -0.0750222   0.075386 )
Norm@50keV  : 2.47658E-02    ( -0.00108759   0.00108622 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          55.44 using 59 PHA bins.
# Reduced chi-squared =         0.9726 for     57 degrees of freedom 
# Null hypothesis probability =   5.339768e-01
 
Photon flux (15-150 keV)    in 33.71 sec: 3.00828 ( -0.14692  0.14744 ) ph/cm2/s
Energy fluence (15-150 keV)             : 8.0872e-06 ( -3.60771e-07  3.60896e-07 ) ergs/cm2

Cutoff power-law model

Time interval is from   -5.908 sec. to   27.804 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.17319     ( -0.247685   0.323693 )
Epeak [keV] : 223.326      ( -100.174 -223.343 )
Norm@50keV  : 3.08750E-02    ( -0.00675421   0.0117448 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          54.00 using 59 PHA bins.
# Reduced chi-squared =         0.9642 for     56 degrees of freedom 
# Null hypothesis probability =   5.511284e-01
 
Photon flux (15-150 keV)    in 33.71 sec: 2.97587 ( -0.15313  0.15384 ) ph/cm2/s
Energy fluence (15-150 keV)             : 8.0393e-06 ( -3.69944e-07  3.68629e-07 ) ergs/cm2

1-s peak spectrum fit

Power-law model

Time interval is from   24.272 sec. to   25.272 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.14311     ( -0.128882   0.130507 )
Norm@50keV  : 0.107262    ( -0.00911817   0.00909533 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          71.50 using 59 PHA bins.
# Reduced chi-squared =          1.254 for     57 degrees of freedom 
# Null hypothesis probability =   9.364115e-02
 
Photon flux (15-150 keV)    in 1 sec: 0.270312 0.300919 0.220649 0.162219 0.123148 9.78392E-02 8.16102E-02 7.10960E-02 6.41139E-02 5.93264E-02 5.59309E-02 5.34435E-02 5.15674E-02 5.01151E-02 4.89654E-02 4.80372E-02 4.72750E-02 4.66396E-02 4.61032E-02 4.56449E-02 4.49078E-02 4.43100E-02 4.38135E-02 4.02189E-02 (    ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.10662e-06 ( -9.5483e-08  9.57275e-08 ) ergs/cm2

Cutoff power-law model

Time interval is from   24.272 sec. to   25.272 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -0.0665502     ( -0.598546   0.693575 )
Epeak [keV] : 107.979      ( -21.1666 59.3578 )
Norm@50keV  : 0.312042    ( -0.136705   0.286788 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          61.17 using 59 PHA bins.
# Reduced chi-squared =          1.092 for     56 degrees of freedom 
# Null hypothesis probability =   2.958049e-01
 
Photon flux (15-150 keV)    in 1 sec: 12.1738 ( -1.1153  1.1212 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.0983e-06 ( -9.94736e-08  9.88815e-08 ) ergs/cm2

Time-resolved spectra

Distribution

T90 vs. Hardness ratio plot

T90                                   = 32.092 sec.
Hardness ratio (energy fluence ratio) = 1.52791773654

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

S(15-50 keV)  = 2.8495512e-06
S(50-150 keV) = 5.237593e-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 = 1.457314487497005E+00,

Spacecraft aspect plot

Bright

Pre-burst

 Time interval of the image: -299.784000 -5.908000

# RAcent #  [deg] 254.5448  35.2573 151.8041  11.6414 137.4834  12.9771 183.1822  16.8375 224.1733  12.9728 242.5756  11.5984 168.7902  61.8461 161.2027  60.4952 193.2879  63.1356

Pre-slew

 Time interval of the image: -5.908000 25.316590

# RAcent #  [deg] 254.6236  35.3185 153.5100  -3.8473 247.8733   2.1866 217.5194  30.6845 143.7368  54.6930

Post-slew

 Time interval of the image: 112.516600 302.320400

# RAcent #  [deg] 244.9857 -15.6385 254.4404  35.3673 255.9869 -37.8450 256.4679 -36.4674 263.0291 -24.5901 264.6068 -44.4751 268.5305  -1.5718 270.3015 -25.0984 270.2950 -25.7206 274.1235 -13.9727 276.0191 -30.4674 284.9467 -24.8135 262.8444 -33.8346 273.6578   5.2964 264.7583  60.1315 290.3975 -19.6874

IMY = -1.432755237830371E-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] ['] 8.9 53.7 -35.9 -1.2636 -1.3 6.7 Her X-1 2.5 41.8 165.3 1.3466 4.6 ------ UNKNOWN 2.6 54.6 173.1 3.2350 4.4 ------ UNKNOWN 3.0 11.7 148.0 0.5427 3.9 ------ UNKNOWN 2.5 29.9 5.1 0.8096 4.6 ------ UNKNOWN 4.3 47.2 -2.9 0.8371 2.7 ------ UNKNOWN 2.4 43.5 -114.6 3.5621 4.8 ------ UNKNOWN 3.1 44.8 -119.9 2.6957 3.7 ------ UNKNOWN 3.9 41.1 -98.2 2.6871 3.0 ------ UNKNOWN background subtracted image of 15-350 keV band DECcent POSerr Theta Phi PeakCts SNR AngSep Name [deg] ['] [deg] [deg] ['] 14.4 53.8 -35.9 -0.1995 -0.8 8.3 Her X-1 2.3 47.5 144.6 0.9587 5.1 ------ UNKNOWN 0.5 55.7 5.6 8.8301 23.5 ------ UNKNOWN 2.6 22.5 -35.0 0.2369 4.5 ------ UNKNOWN 2.0 49.7 -133.3 1.4040 5.7 ------ UNKNOWN image of 15-350 keV band DECcent POSerr Theta Phi PeakCts SNR AngSep Name [deg] ['] [deg] [deg] ['] 0.2 18.0 16.2 11.0520 71.8 0.4 Sco X-1 5.6 33.7 -163.2 -0.4122 -2.0 1.7 Her X-1 165.7 40.7 -2.7 0.0176 0.1 0.1 4U 1700-377 3.7 39.5 -3.7 0.7201 3.1 3.1 GX 349+2 7.4 30.5 -20.7 0.2874 1.6 9.4 GX 1+4 4.8 49.0 -8.6 0.8120 2.4 6.0 4U 1735-44 0.0 21.0 -72.7 0.0946 0.5 12.1 SW J1753.5-0127 2.7 34.9 -30.0 0.8393 4.2 1.5 GX 5-1 3.6 35.3 -29.3 0.6668 3.2 1.4 GRS 1758-258 6.7 30.6 -50.3 0.3824 1.7 7.8 GX 17+2 5.8 42.2 -30.0 -0.5518 -2.0 7.7 H1820-303 8.8 44.9 -43.6 0.5542 1.3 8.1 HT1900.1-2455 6.2 38.7 -12.9 0.3855 1.9 7.2 GX 354-0 3.0 25.9 -90.5 0.8545 3.8 ------ UNKNOWN 4.5 59.4 -163.2 3.7391 2.6 ------ UNKNOWN 3.2 47.1 -53.1 2.6502 3.6 ------ 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

Pre-burst Time interval of the image: -299.784000 -5.908000 # RAcent # [deg] 254.5448 35.2573 151.8041 11.6414 137.4834 12.9771 183.1822 16.8375 224.1733 12.9728 242.5756 11.5984 168.7902 61.8461 161.2027 60.4952 193.2879 63.1356

Pre-slew Time interval of the image: -5.908000 25.316590 # RAcent # [deg] 254.6236 35.3185 153.5100 -3.8473 247.8733 2.1866 217.5194 30.6845 143.7368 54.6930

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

Pre-burst
Time interval of the image: -299.784000 -5.908000 # RAcent # [deg] 254.5448 35.2573 151.8041 11.6414 137.4834 12.9771 183.1822 16.8375 224.1733 12.9728 242.5756 11.5984 168.7902 61.8461 161.2027 60.4952 193.2879 63.1356

Pre-slew
Time interval of the image: -5.908000 25.316590 # RAcent # [deg] 254.6236 35.3185 153.5100 -3.8473 247.8733 2.1866 217.5194 30.6845 143.7368 54.6930