GRB090401A

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: Tue Sep  9 02:01:13 EDT 2014
             Host Name: batevent1
   Current Working Dir: /local/data/batevent/batevent_reproc/trigger348128
======================================================================

  Trigger: 00348128      Segment: 000

  BAT Trigger Time: 260236864   [s; MET]
      Trigger Stop: 260236928   [s; MET]
               UTC: 2009-04-01T00:00:59.378700    [includes UTCF correction] 
       Where From?: TDRSS position message

  BAT 
    RA: 350.908652961353   Dec: 29.7666028590948  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    10.41
     Image Trigger?:     YES
     Rate S/N Ratio:     0  [ if not an image trigger ]
     Image S/N Ratio:    10.41

  Analysis Position:   [ source = BAT ]
    RA: 350.908652961353   Dec: 29.7666028590948  [deg; J2000]

  Refined Position:   [ source = BAT pre-slew burst ]
    RA: 350.920731352883   Dec: 29.7630869210671  [deg; J2000]  
        { 23h 23m 41.0s , +29d 45' 47.1" }
         +/- 0.676069334960927 [arcmin] (estimated 90% radius based on SNR)
         +/- 0.210424132759514 [arcmin] (formal 1-sigma fit error)
    SNR: 53.209360624473
 
  Angular difference between the analysis and refined position is 0.663522 arcmin
 
  Partial Coding Fraction: 0.3828125    [ including projection effects ]

  Duration
     T90: 117.004000008106 +/- 14.0428857279561
        Measured from: 13.6719999909401
                   to: 130.675999999046     [s; relative to TRIGTIME]
     T50: 25.2199999988079 +/- 0.708316324477986
        Measured from: 97.3720000088215
                   to: 122.592000007629     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: 122.048000007868     
                   to: 123.048000007868     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: -11.9480000138283     
                   to: 165.00799998641     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     4.914235   6.419821   4.985251   1.150727
           0.114302   0.120608   0.107088   0.087701 [error]
 Peak      0.290805   0.468003   0.402817   0.154919
           0.013659   0.016183   0.015599   0.011613 [error]

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

======================================================================
 
 
====== Table of the duration information =============================
 
        Value   tstart    tstop
T100  176.956  -11.948  165.008
T90   117.004   13.672  130.676
T50    25.220   97.372  122.592
Peak    1.000  122.048  123.048
 
 
====== 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      -1.628    -0.047      0.047       -           -               -         6.76e-03     -1.64e-04          1.64e-04      45.630   57
CPL     -1.518    -0.136      0.186      242.675    -117.716      -242.675      7.59e-03     -9.34e-04          1.57e-03      44.540   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      -1.303     -0.071     0.071       -           -               -         9.17e-02     -3.55e-03          3.55e-03      61.240   57
CPL     -1.260     -0.112     0.138      979.910    -979.910      -979.910      9.59e-02     -7.37e-03          5.38e-03      61.870   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   1.72e-06  2.93e-06  3.79e-06  9.90e-06  1.12e-05  1.83e-05   erg/cm2
      90%_error_low -8.49e-08 -8.30e-08 -1.15e-07 -6.79e-07 -2.79e-07 -7.39e-07   erg/cm2
      90%_error_hi   8.67e-08  8.28e-08  1.15e-07  7.13e-07  2.80e-07  7.64e-07   erg/cm2
Peak flux       PL   3.13e+00  3.54e+00  2.87e+00  3.87e+00  1.09e+01  1.34e+01   ph/cm2/s
      90%_error_low -2.41e-01 -1.65e-01 -1.30e-01 -3.69e-01 -4.48e-01 -5.30e-01   ph/cm2/s
      90%_error_hi   2.48e-01  1.64e-01  1.29e-01  3.92e-01  4.49e-01  5.32e-01   ph/cm2/s
 
Fluence        CPL   1.68e-06  2.95e-06  3.83e-06  8.57e-06  1.11e-05  1.70e-05   erg/cm2
      90%_error_low -1.13e-07 -8.70e-08 -1.28e-07 -1.76e-06 -3.10e-07 -1.79e-06   erg/cm2
      90%_error_hi   1.13e-07  8.74e-08  1.29e-07  1.76e-06  3.09e-07  1.62e-06   erg/cm2
Peak flux      CPL   3.21e+00  3.51e+00  2.83e+00  3.86e+00  1.10e+01  1.39e+01   ph/cm2/s
      90%_error_low -3.13e-01 -1.38e-01     N/A       N/A   -5.26e-01 -1.24e+00   ph/cm2/s
      90%_error_hi   1.65e-01  1.90e-01     N/A       N/A    3.71e-01  6.60e-03   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
  350.9207    29.7631   0.0036    36.3844  -124.7862        18.0223877     53.209 TRIG_00348128                 
 
Foreground time interval of the image:
 -4.899 165.008 (delta_t = 169.907 [sec])
Background time interval of the image:

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  -11.948 sec. to  165.008 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.62833     ( -0.0474909   0.0473648 )
Norm@50keV  : 6.76467E-03    ( -0.000164195   0.000164175 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          45.63 using 59 PHA bins.
# Reduced chi-squared =         0.8006 for     57 degrees of freedom 
# Null hypothesis probability =   8.602492e-01
 
Photon flux (15-150 keV)    in 177 sec: 0.877128 ( -0.024537  0.024643 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.11625e-05 ( -2.79425e-07  2.80021e-07 ) ergs/cm2

Cutoff power-law model

Time interval is from  -11.948 sec. to  165.008 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.51801     ( -0.135973   0.186229 )
Epeak [keV] : 242.675      ( -117.72 -242.678 )
Norm@50keV  : 7.58683E-03    ( -0.000933805   0.00157001 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          44.54 using 59 PHA bins.
# Reduced chi-squared =         0.7954 for     56 degrees of freedom 
# Null hypothesis probability =   8.649266e-01
 
Photon flux (15-150 keV)    in 177 sec: 0.868645 ( -0.027849  0.028013 ) ph/cm2/s
Energy fluence (15-150 keV)             : 1.10796e-05 ( -3.10138e-07  3.09359e-07 ) ergs/cm2

1-s peak spectrum fit

Power-law model

Time interval is from  122.048 sec. to  123.048 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.30308     ( -0.0708966   0.0709804 )
Norm@50keV  : 9.17034E-02    ( -0.00354666   0.00354663 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          61.24 using 59 PHA bins.
# Reduced chi-squared =          1.074 for     57 degrees of freedom 
# Null hypothesis probability =   3.264042e-01
 
Photon flux (15-150 keV)    in 1 sec: 10.9468 ( -0.4478  0.4492 ) ph/cm2/s
Energy fluence (15-150 keV)             : 9.05628e-07 ( -3.81469e-08  3.82155e-08 ) ergs/cm2

Cutoff power-law model

Time interval is from  122.048 sec. to  123.048 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.29927     ( -0.112019   0.138045 )
Epeak [keV] : 9999.14      ( -9999.15 -9999.15 )
Norm@50keV  : 9.20854E-02    ( -0.00356137   0.00918878 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          61.29 using 59 PHA bins.
# Reduced chi-squared =          1.095 for     56 degrees of freedom 
# Null hypothesis probability =   2.919058e-01
 
Photon flux (15-150 keV)    in 1 sec: 11.0228 ( -0.5263  0.3708 ) ph/cm2/s
Energy fluence (15-150 keV)             : 9.10668e-07 ( -4.34066e-08  3.29148e-08 ) ergs/cm2

Time-resolved spectra

Distribution

T90 vs. Hardness ratio plot

T90                                   = 117.004 sec.
Hardness ratio (energy fluence ratio) = 1.29386797314

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

S(15-50 keV)  = 4.655385e-06
S(50-150 keV) = 6.507265e-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 = -4.203805169982753E-01, IMY = 6.051591383681547E-01

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:
-4.899400 165.008000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
288.8042  10.9288    1.7  34.0  113.5   2.0943   6.8    1.1	GRS 1915+105                  
299.5729  35.1965    0.4  36.9  159.1   7.8576  28.3    0.9	Cyg X-1                       
308.0669  40.9091    2.6  38.2  173.4   1.1338   4.5    3.3	Cyg X-3                       
326.2396  38.1791   11.1  33.3 -163.5   0.2368   1.0    9.1	Cyg X-2                       
291.2683  -2.4922    2.8  32.2   88.6   1.3365   4.1 ------	UNKNOWN                       
350.9207  29.7631    0.2  36.4 -124.8  18.0209  53.2 ------	UNKNOWN

Post-slew image of 15-350 keV band

Time interval of the image:
730.300600 963.182300
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
 83.6299  22.0007    0.6  52.7 -177.8   8.8541  19.3    0.8	Crab                          
308.0120  40.8491   34.3  56.9  -26.2  -0.3210  -0.3    7.6	Cyg X-3                       
 68.7119  36.8851    3.3  36.4 -161.9   0.7355   3.5 ------	UNKNOWN                       
 19.4086  36.8103    3.2  41.1  -97.8   2.8772   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 source in the pre-burst/pre-slew/post-slew images

Pre-burst image of 15-350 keV band

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

Post-slew image of 15-350 keV band

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