GRB140521A

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 Oct  4 22:40:28 EDT 2014
             Host Name: batevent1
   Current Working Dir: /local/data/batevent/batevent_reproc/trigger599546
======================================================================

  Trigger: 00599546      Segment: 000

  BAT Trigger Time: 422386470.528   [s; MET]
      Trigger Stop: 422386471.04   [s; MET]
               UTC: 2014-05-21T17:34:18.488820    [includes UTCF correction] 
       Where From?: TDRSS position message

  BAT 
    RA: 320.012929795079   Dec: 67.6017447960794  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    7.49
     Image Trigger?:     NO
     Rate S/N Ratio:     21  [ if not an image trigger ]
     Image S/N Ratio:    7.49

  Analysis Position:   [ source = BAT ]
    RA: 320.012929795079   Dec: 67.6017447960794  [deg; J2000]

  Refined Position:   [ source = BAT pre-slew burst ]
    RA: 320.176228895895   Dec: 67.5869561798523  [deg; J2000]  
        { 21h 20m 42.3s , +67d 35' 13.0" }
         +/- 1.10825116481743 [arcmin] (estimated 90% radius based on SNR)
         +/- 0.355983870185064 [arcmin] (formal 1-sigma fit error)
    SNR: 26.263314113634
 
  Angular difference between the analysis and refined position is 3.838562 arcmin
 
  Partial Coding Fraction: 0.5546875    [ including projection effects ]

  Duration
     T90: 9.87599992752075 +/- 1.09238088792287
        Measured from: 0.480000019073486
                   to: 10.3559999465942     [s; relative to TRIGTIME]
     T50: 5.41999995708466 +/- 0.604052961815898
        Measured from: 1.65200001001358
                   to: 7.07199996709824     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: 0.643999993801117     
                   to: 1.64399999380112     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: 0.15200001001358     
                   to: 11.4520000219345     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     0.350072   0.517031   0.419325   0.129458
           0.028258   0.029572   0.025951   0.020019 [error]
 Peak      0.047280   0.051910   0.104210   0.049246
           0.008392   0.009192   0.009165   0.007352 [error]

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

======================================================================
 
 
====== Table of the duration information =============================
 
        Value   tstart    tstop
T100   11.300    0.152   11.452
T90     9.876    0.480   10.356
T50     5.420    1.652    7.072
Peak    1.000    0.644    1.644
 
 
====== 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      -1.428    -0.109      0.109       -           -               -         8.64e-03     -5.30e-04          5.29e-04      50.800   57
CPL     -1.392    -0.144      0.361      864.512    -864.512      -864.512      9.00e-03     -8.68e-04          4.29e-03      50.840   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      -0.670     -0.213     0.225       -           -               -         1.62e-02     -2.09e-03          2.03e-03      47.190   57
CPL     -0.664     -0.213     0.230     9999.360    -9999.360      -9999.360      1.64e-02     -1.97e-03          1.37e-02      47.200   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   1.17e-07  2.24e-07  3.32e-07  1.06e-06  9.38e-07  1.74e-06   erg/cm2
      90%_error_low -1.29e-08 -1.50e-08 -2.58e-08 -1.71e-07 -6.29e-08 -1.90e-07   erg/cm2
      90%_error_hi   1.33e-08  1.49e-08  2.57e-08  1.93e-07  6.32e-08  2.08e-07   erg/cm2
Peak flux       PL   3.04e-01  5.03e-01  6.32e-01  1.58e+00  1.88e+00  3.02e+00   ph/cm2/s
      90%_error_low -8.24e-02 -8.83e-02 -6.99e-02 -3.72e-01 -2.21e-01 -3.87e-01   ph/cm2/s
      90%_error_hi   9.35e-02  8.74e-02  6.97e-02  4.47e-01  2.22e-01  4.18e-01   ph/cm2/s
 
Fluence        CPL   1.17e-07  2.24e-07  3.32e-07  1.06e-06  9.38e-07  1.74e-06   erg/cm2
      90%_error_low    N/A    -1.48e-08 -2.56e-08    N/A    -6.77e-08 -4.76e-07   erg/cm2
      90%_error_hi     N/A     1.71e-08  2.83e-08    N/A     5.45e-08  1.04e-07   erg/cm2
Peak flux      CPL   3.03e-01  5.06e-01  6.31e-01  1.65e+00  1.89e+00  3.01e+00   ph/cm2/s
      90%_error_low     N/A       N/A   -6.86e-02 -7.73e-01 -2.51e-01 -7.40e-01   ph/cm2/s
      90%_error_hi      N/A       N/A    8.82e-02  3.67e-01  2.36e-01  3.84e-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
  320.1762    67.5870   0.0073    30.2645  -123.5849         1.5601485     26.263 TRIG_00599546                 
 
Foreground time interval of the image:
  0.152  11.452 (delta_t =  11.300 [sec])
Background time interval of the image:
-34.227   0.152 (delta_t =  34.379 [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    0.152 sec. to   11.452 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.42849     ( -0.109304   0.109397 )
Norm@50keV  : 8.63625E-03    ( -0.000530335   0.000529404 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          50.80 using 59 PHA bins.
# Reduced chi-squared =         0.8912 for     57 degrees of freedom 
# Null hypothesis probability =   7.054513e-01
 
Photon flux (15-150 keV)    in 11.3 sec: 1.05876 ( -0.06731  0.06747 ) ph/cm2/s
Energy fluence (15-150 keV)             : 9.37775e-07 ( -6.28543e-08  6.31663e-08 ) ergs/cm2

Cutoff power-law model

Time interval is from    0.152 sec. to   11.452 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.42549     ( -0.140454   0.364978 )
Epeak [keV] : 9999.17      ( -9999.17 -9999.17 )
Norm@50keV  : 8.66601E-03    ( -0.000532367   0.0046216 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          50.80 using 59 PHA bins.
# Reduced chi-squared =         0.9072 for     56 degrees of freedom 
# Null hypothesis probability =   6.713921e-01
 
Photon flux (15-150 keV)    in 11.3 sec: 1.05922 ( -0.07017  0.06726 ) ph/cm2/s
Energy fluence (15-150 keV)             : 9.38315e-07 ( -6.7655e-08  5.44548e-08 ) ergs/cm2

1-s peak spectrum fit

Power-law model

Time interval is from    0.644 sec. to    1.644 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -0.670469     ( -0.212756   0.224942 )
Norm@50keV  : 1.62315E-02    ( -0.00209424   0.00203134 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          47.19 using 59 PHA bins.
# Reduced chi-squared =         0.8278 for     57 degrees of freedom 
# Null hypothesis probability =   8.198001e-01
 
Photon flux (15-150 keV)    in 1 sec: 1.88091 ( -0.22138  0.22245 ) ph/cm2/s
Energy fluence (15-150 keV)             : 2.00835e-07 ( -2.31339e-08  2.31454e-08 ) ergs/cm2

Cutoff power-law model

Time interval is from    0.644 sec. to    1.644 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -0.663803     ( -0.212765   0.230003 )
Epeak [keV] : 9999.36      ( -9999.36 -9999.36 )
Norm@50keV  : 1.63686E-02    ( -0.00196382   0.0137366 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          47.20 using 59 PHA bins.
# Reduced chi-squared =         0.8428 for     56 degrees of freedom 
# Null hypothesis probability =   7.927179e-01
 
Photon flux (15-150 keV)    in 1 sec: 1.88776 ( -0.25074  0.23644 ) ph/cm2/s
Energy fluence (15-150 keV)             : 2.00789e-07 ( -2.31084e-08  2.31759e-08 ) ergs/cm2

Time-resolved spectra

Distribution

T90 vs. Hardness ratio plot

T90                                   = 9.876 sec.
Hardness ratio (energy fluence ratio) = 1.48610675913

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

S(15-50 keV)  = 3.402522e-07
S(50-150 keV) = 5.975234e-07

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 = -3.227881382640286E-01, IMY = 4.861139331290731E-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:
-34.227410 0.152000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
254.2506  35.3140   10.8  29.7  125.6   0.1046   1.1   10.3	Her X-1                       
288.8186  10.9205    1.9  30.7   40.7   0.5337   6.0    1.9	GRS 1915+105                  
299.6104  35.2127    0.6   8.9  -11.9   1.1809  20.3    1.2	Cyg X-1                       
308.1387  40.9587    4.6  12.4  -57.6   0.1571   2.5    1.3	Cyg X-3                       
326.0222  38.1519   99.0  26.4  -58.9   0.0088   0.1   12.4	Cyg X-2                       
214.8980  47.8984    2.2  52.6  160.1   1.5482   5.1 ------	UNKNOWN

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

Time interval of the image:
0.152000 11.452000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
254.4557  35.5184    5.7  29.5  125.9  -0.1510  -2.0   10.6	Her X-1                       
288.8270  10.8794    5.0  30.7   40.7  -0.1404  -2.3    4.3	GRS 1915+105                  
299.3419  35.2550    9.3   8.7  -11.0   0.0524   1.2   12.6	Cyg X-1                       
307.9943  40.7821   22.1  12.3  -56.7   0.0226   0.5   11.5	Cyg X-3                       
326.3727  38.2672    5.2  26.6  -59.3  -0.1249  -2.2   10.0	Cyg X-2                       
320.1762  67.5870    0.4  30.3 -123.6   1.5602  26.3 ------	UNKNOWN

Post-slew image of 15-350 keV band

Time interval of the image:

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