GRB140318A: Summary Image Light curves Spectra Distribution Others

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: Sun Oct  5 00:14:21 EDT 2014
             Host Name: batevent1
   Current Working Dir: /local/data/batevent/batevent_reproc/trigger592204
======================================================================

  Trigger: 00592204      Segment: 000

  BAT Trigger Time: 416794159.744   [s; MET]
      Trigger Stop: 416794171.904   [s; MET]
               UTC: 2014-03-18T00:09:07.971300    [includes UTCF correction] 
       Where From?: TDRSS position message

  BAT 
    RA: 184.052783456915   Dec: 20.2074317487921  [deg; J2000]

     Catalogged Source?: NO
     Point Source?:      YES
     GRB Indicated?:     YES    [ by BAT flight software ]
     Image S/N Ratio:    8.5
     Image Trigger?:     NO
     Rate S/N Ratio:     12.2474487139159  [ if not an image trigger ]
     Image S/N Ratio:    8.5

  Analysis Position:   [ source = BAT ]
    RA: 184.052783456915   Dec: 20.2074317487921  [deg; J2000]

  Refined Position:   [ source = BAT pre-slew burst ]
    RA: 184.050018980769   Dec: 20.22515773557  [deg; J2000]  
        { 12h 16m 12.0s , +20d 13' 30.6" }
         +/- 2.11435441791349 [arcmin] (estimated 90% radius based on SNR)
         +/- 0.673116130558229 [arcmin] (formal 1-sigma fit error)
    SNR: 10.4370720975466
 
  Angular difference between the analysis and refined position is 1.074888 arcmin
 
  Partial Coding Fraction: 0.4921875    [ including projection effects ]

  Duration
     T90: 7.6039999127388 +/- 1.27603289493624
        Measured from: 3.52799999713898
                   to: 11.1319999098778     [s; relative to TRIGTIME]
     T50: 4.75599992275238 +/- 1.66540924222543
        Measured from: 4.31599998474121
                   to: 9.07199990749359     [s; relative to TRIGTIME]



  Fluence
     Peak Flux  (peak 1 second)
        Measured from: 5.47999995946884     
                   to: 6.47999995946884     [s; relative to TRIGTIME]
     Total Fluence        
        Measured from: 2.24399995803833     
                   to: 11.6759999990463     [s; relative to TRIGTIME]
     
             Band 1     Band 2     Band 3     Band 4
              15-25      25-50     50-100    100-350     keV
 Total     0.095076   0.164878   0.127145   0.059662
           0.023456   0.022982   0.020265   0.017444 [error]
 Peak      0.007259   0.037596   0.016701   0.012189
           0.007720   0.007383   0.006556   0.005666 [error]

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

======================================================================
 
 
====== Table of the duration information =============================
 
        Value   tstart    tstop
T100    9.432    2.244   11.676
T90     7.604    3.528   11.132
T50     4.756    4.316    9.072
Peak    1.000    5.480    6.480
 
 
====== 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      -1.346    -0.276      0.280       -           -               -         3.09e-03     -4.83e-04          4.83e-04      54.960   57
CPL     -1.086    -1.576      1.240      180.845    -180.845      -180.845      4.16e-03     -1.52e-03          1.22e-02      54.780   56
 
 
=== 1-s peak spectral analysis ===
(Best model with acceptable fit: N/A)
 
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      -1.009     -0.514     0.605       -           -               -         4.66e-03     -1.51e-03          1.47e-03      87.560   57
CPL     -0.560      0.560     2.616      159.367    -159.367      -159.367      7.79e-03     -4.56e-03          1.61e-01      87.470   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   3.23e-08  6.52e-08  1.03e-07  3.57e-07  2.85e-07  5.57e-07   erg/cm2
      90%_error_low -8.89e-09 -1.13e-08 -2.00e-08 -1.32e-07 -4.90e-08 -1.49e-07   erg/cm2
      90%_error_hi   9.62e-09  1.11e-08  1.97e-08  1.79e-07  4.96e-08  1.87e-07   erg/cm2
Peak flux       PL   1.20e-01  1.62e-01  1.61e-01  2.88e-01  5.37e-01  7.31e-01   ph/cm2/s
      90%_error_low -6.99e-02 -6.77e-02 -5.13e-02 -1.55e-01 -1.74e-01 -2.24e-01   ph/cm2/s
      90%_error_hi   8.87e-02  6.55e-02  5.07e-02  2.58e-01  1.77e-01  2.43e-01   ph/cm2/s
 
Fluence        CPL   3.08e-08  6.68e-08  1.04e-07  2.40e-07  2.80e-07  4.42e-07   erg/cm2
      90%_error_low -1.06e-08 -1.26e-08 -2.12e-08 -1.82e-07 -5.49e-08 -1.92e-07   erg/cm2
      90%_error_hi   1.07e-08  1.36e-08  2.22e-08  3.32e-07  5.36e-08  1.69e-07   erg/cm2
Peak flux      CPL   1.12e-01  1.68e-01  1.68e-01  1.88e-01  5.31e-01  6.36e-01   ph/cm2/s
      90%_error_low -7.53e-02 -7.20e-02 -5.68e-02 -1.88e-01 -1.74e-01 -2.57e-01   ph/cm2/s
      90%_error_hi   9.45e-02  7.97e-02  6.22e-02  1.59e-01  1.79e-01  3.24e-01   ph/cm2/s
 
======================================================================

Image

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

#   RAcent    DECcent   POSerr    Theta     Phi              Peak Cts       SNR   Name
  184.0500    20.2252   0.0184    28.4810   125.5736         0.4459840     10.437 TRIG_00592204                 
 
Foreground time interval of the image:
  2.244  11.676 (delta_t =   9.432 [sec])
Background time interval of the image:
-239.744   2.244 (delta_t = 241.988 [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

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    2.244 sec. to   11.676 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.34592     ( -0.275889   0.279583 )
Norm@50keV  : 3.09471E-03    ( -0.00048326   0.000482605 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          54.96 using 59 PHA bins.
# Reduced chi-squared =         0.9642 for     57 degrees of freedom 
# Null hypothesis probability =   5.519712e-01
 
Photon flux (15-150 keV)    in 9.432 sec: 0.372517 ( -0.059844  0.060072 ) ph/cm2/s
Energy fluence (15-150 keV)             : 2.8538e-07 ( -4.89877e-08  4.96267e-08 ) ergs/cm2
 

Cutoff power-law model

Time interval is from    2.244 sec. to   11.676 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.08585     ( -1.57593   1.23954 )
Epeak [keV] : 180.845      ( -180.868 -180.868 )
Norm@50keV  : 4.16062E-03    ( -0.00151764   0.0122224 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          54.78 using 59 PHA bins.
# Reduced chi-squared =         0.9782 for     56 degrees of freedom 
# Null hypothesis probability =   5.211698e-01
 
Photon flux (15-150 keV)    in 9.432 sec: 0.368027 ( -0.062609  0.062476 ) ph/cm2/s
Energy fluence (15-150 keV)             : 2.79668e-07 ( -5.49472e-08  5.36153e-08 ) ergs/cm2
 

1-s peak spectrum fit

Power-law model

Time interval is from    5.480 sec. to    6.480 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.00886     ( -0.514144   0.604807 )
Norm@50keV  : 4.65914E-03    ( -0.0015134   0.00146615 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          87.56 using 59 PHA bins.
# Reduced chi-squared =          1.536 for     57 degrees of freedom 
# Null hypothesis probability =   5.733856e-03
 
Photon flux (15-150 keV)    in 1 sec: 0.536666 ( -0.173582  0.176983 ) ph/cm2/s
Energy fluence (15-150 keV)             : 5.02296e-08 ( -1.58073e-08  1.59936e-08 ) ergs/cm2
 

Cutoff power-law model

Time interval is from    5.480 sec. to    6.480 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -0.560037     ( 0.608762   2.66428 )
Epeak [keV] : 159.367      ( -187.223 -187.223 )
Norm@50keV  : 7.79070E-03    ( -0.00386919   0.161256 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          87.47 using 59 PHA bins.
# Reduced chi-squared =          1.562 for     56 degrees of freedom 
# Null hypothesis probability =   4.534824e-03
 
Photon flux (15-150 keV)    in 1 sec: 0.530573 ( -0.173509  0.179068 ) ph/cm2/s
Energy fluence (15-150 keV)             : 4.89497e-08 ( -1.82708e-08  1.69009e-08 ) ergs/cm2
 

Time-resolved spectra

Distribution

T90 vs. Hardness ratio plot

T90                                   = 7.604 sec.
Hardness ratio (energy fluence ratio) = 1.57365677979

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

S(15-50 keV)  = 9.742331e-08
S(50-150 keV) = 1.8796017e-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 = -3.156132590397236E-01, IMY = -4.412741659074138E-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:
-239.744000 2.244000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
244.9761 -15.6424    0.3  50.4   -0.1  19.1982  38.7    0.2	Sco X-1                       
254.6136  35.4387   21.7  35.9  -77.2   0.3152   0.5    9.6	Her X-1                       
168.5806  15.7407    2.5  43.9  126.0   3.5909   4.5 ------	UNKNOWN                       

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

Time interval of the image:
2.244000 11.676000
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
245.0505 -15.5720    7.4  50.4   -0.2  -0.1150  -1.6    5.8	Sco X-1                       
254.3658  35.2148    6.8  35.6  -76.8   0.1058   1.7    8.9	Her X-1                       
214.5084 -15.0494    2.1  40.2   39.3   0.3433   5.5 ------	UNKNOWN                       
184.0500  20.2252    1.1  28.5  125.6   0.4460  10.4 ------	UNKNOWN                       
148.8855  65.8535    2.3  57.3 -167.1   0.6685   5.1 ------	UNKNOWN                       

Post-slew image of 15-350 keV band

Time interval of the image:
113.356600 303.756630
 
# RAcent  DECcent POSerr Theta    Phi  PeakCts   SNR AngSep     Name
#  [deg]    [deg]    ['] [deg]  [deg]                   [']
149.1948  -7.0848    2.7  43.8  126.0   2.7197   4.3 ------	UNKNOWN                       
177.0434  17.8846    2.6   7.0  142.8   0.5963   4.4 ------	UNKNOWN                       
203.7684  10.1449    2.8  21.5    6.1   0.5617   4.2 ------	UNKNOWN                       
122.0316  25.7163    3.7  56.9  179.2   3.0381   3.2 ------	UNKNOWN                       
119.7489  30.1534    4.1  58.3 -175.3   2.7915   2.8 ------	UNKNOWN                       
119.2978  32.6269    2.7  58.5 -172.4   4.1924   4.3 ------	UNKNOWN