GRB151122A

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 GROUND-DETECTED GRB DATA PROCESSING REPORT                 
    Process Script Ver: batgrbproduct v2.46
    Process Start Time: Tue Dec 15 16:58:07 EST 2015
             Host Name: bat1
   Current Working Dir: /local/data/bat1/alien/Swift_3rdBATcatalog/event/ground_detect_bursts/scripts
======================================================================

  Trigger: 00664653      Segment: 000

  BAT Trigger Time: 469904452.8
               UTC: 2015-11-22T17:00:52.800   [includes UTCF correction]
       Where From?: Ground analysis (best_duration.txt)
  NOTE: BAT trigger time for ground-detected burst is the T100 start time.
 
  Analysis Position:   [ source = GCN ]
    RA: not   Dec: available)  [deg; J2000]
 
  Refined Position:   [ source = BAT pre-slew image ]
    RA: 299.695725534   Dec: -19.8612331446  [deg; J2000]
        { 19h 58m 47.0s , -19d -51' -40.4" }
        +/- 1.51584677277 [arcmin] (estimated 90% radius based on SNR)
    SNR: 16.791759008
 
 
  Angular difference between the analysis and refined position is 3733.786238 arcmin
 
  Partial Coding Fraction: 0.859375    [ including projection effects ]

  Duration
     T90: 36.8000000715256 +/- 1.6
        Measured from: 1.6
                   to: 38.4     [s; relative to TRIGTIME]
     T50: 20.8000000715256 +/- 1.6
        Measured from: 9.6
                   to: 30.4     [s; relative to TRIGTIME]
 
 
====== Table of the duration information =============================
 
        Value   tstart    tstop
T100   40.000    0.000   40.000
T90    36.800    1.600   38.400
T50    20.800    9.600   30.400
Peak    1.000    8.300    9.300
 
 
====== 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      -1.664    -0.151      0.149       -           -               -         4.88e-03     -4.24e-04          4.20e-04      52.550   57
CPL     -1.605    -0.692      0.591      288.198    -270.957      -288.198      5.24e-03     -1.76e-03          5.18e-03      52.540   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      -1.948     -0.318     0.297       -           -               -         7.06e-03     -1.45e-03          1.40e-03      70.380   57
CPL     -1.549     -0.855     2.136       46.310      N/A           N/A         1.21e-02        N/A               N/A         70.140   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   7.30e-08  1.21e-07  1.53e-07  3.86e-07  4.55e-07  7.34e-07   erg/cm2
      90%_error_low -9.89e-09 -1.02e-08 -1.78e-08 -8.76e-08 -4.17e-08 -1.04e-07   erg/cm2
      90%_error_hi   1.02e-08  1.02e-08  1.78e-08  1.04e-07  4.21e-08  1.16e-07   erg/cm2
Peak flux       PL   4.48e-01  3.46e-01  1.79e-01  1.34e-01  1.04e+00  1.11e+00   ph/cm2/s
      90%_error_low -1.06e-01 -5.70e-02 -4.72e-02 -5.77e-02 -1.71e-01 -1.83e-01   ph/cm2/s
      90%_error_hi   1.11e-01  5.70e-02  4.80e-02  7.96e-02  1.71e-01  1.84e-01   ph/cm2/s
 
Fluence        CPL   7.24e-08  1.22e-07  1.54e-07  3.51e-07  4.53e-07  6.99e-07   erg/cm2
      90%_error_low -1.15e-08 -1.07e-08 -1.81e-08 -2.05e-07 -4.70e-08 -2.11e-07   erg/cm2
      90%_error_hi   9.44e-09  1.26e-08  1.85e-08  5.33e-08  4.38e-08  1.45e-07   erg/cm2
Peak flux      CPL   4.33e-01  3.64e-01  1.77e-01  7.37e-02  1.02e+00  1.05e+00   ph/cm2/s
      90%_error_low -1.21e-01     N/A   -6.44e-02 -7.37e-02 -1.81e-01 -2.05e-01   ph/cm2/s
      90%_error_hi   1.17e-01     N/A    5.12e-02  7.70e-02  1.78e-01  2.45e-01   ph/cm2/s
 
======================================================================

Special notes of this burst

Image

15.0-350.0 keV image (Event data)

#RAcent DECcent POSerr Theta  Phi  Peak_Cts  SNR Name
299.696 -19.861 0.011 25.704 179.157 0.594 16.792 TRIG_00664653
 
Image time interval: 1.200 to 8.501 [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.

Best duration plot

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    1.200 sec. to   11.255 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.66413     ( -0.151263   0.148934 )
Norm@50keV  : 4.87865E-03    ( -0.000423527   0.000419673 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          52.55 using 59 PHA bins.
# Reduced chi-squared =         0.9218 for     57 degrees of freedom 
# Null hypothesis probability =   6.427192e-01
 
Photon flux (15-150 keV)    in 10.05 sec: 0.640057 ( -0.053628  0.053765 ) ph/cm2/s
Energy fluence (15-150 keV)             : 4.55445e-07 ( -4.17063e-08  4.21158e-08 ) ergs/cm2

Cutoff power-law model

Time interval is from    1.200 sec. to   11.255 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.60478     ( -0.68993   0.593501 )
Epeak [keV] : 288.198      ( -320.856 -338.096 )
Norm@50keV  : 5.23581E-03    ( -0.00174296   0.00519559 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          52.54 using 59 PHA bins.
# Reduced chi-squared =         0.9383 for     56 degrees of freedom 
# Null hypothesis probability =   6.064731e-01
 
Photon flux (15-150 keV)    in 10.05 sec: 0.638263 ( -0.056322  0.054971 ) ph/cm2/s
Energy fluence (15-150 keV)             : 4.53259e-07 ( -4.69878e-08  4.37521e-08 ) ergs/cm2

1-s peak spectrum fit

Power-law model

Time interval is from    8.300 sec. to    9.300 sec.
 
Spectral model in power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.94844     ( -0.318126   0.296698 )
Norm@50keV  : 7.06194E-03    ( -0.00144904   0.00140051 )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          70.38 using 59 PHA bins.
# Reduced chi-squared =          1.235 for     57 degrees of freedom 
# Null hypothesis probability =   1.096476e-01
 
Photon flux (15-150 keV)    in 1 sec: 1.03502 ( -0.171276  0.17137 ) ph/cm2/s
Energy fluence (15-150 keV)             : 6.4998e-08 ( -1.25632e-08  1.29042e-08 ) ergs/cm2

Cutoff power-law model

Time interval is from    8.300 sec. to    9.300 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters  : value       lower 90%   higher 90%
Photon index: -1.5486     ( -0.857413   2.13419 )
Epeak [keV] : 46.3103      (   )
Norm@50keV  : 1.21297E-02    (     )
------------------------------------------------------------
#Fit statistic : Chi-Squared =          70.14 using 59 PHA bins.
# Reduced chi-squared =          1.253 for     56 degrees of freedom 
# Null hypothesis probability =   9.684204e-02
 
Photon flux (15-150 keV)    in 1 sec: 1.02022 ( -0.181298  0.17842 ) ph/cm2/s
Energy fluence (15-150 keV)             : 0 ( 0  0 ) ergs/cm2

Time-resolved spectra

Distribution

T90 vs. Hardness ratio plot

T90                                   = N/A sec.
Hardness ratio (energy fluence ratio) = N/A

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

S(15-50 keV)  = N/A
S(50-150 keV) = N/A

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 = -0.481296325455,

Spacecraft aspect plot

Bright

Event

 Time interval of the image: 1.200000 8.500600

# RAcent #  [deg] 244.9775 -15.6024 254.3766  35.3019 263.2337 -24.7718 268.4827  -1.5485 270.2417 -24.9666 270.2989 -25.6915 273.8410 -13.9754 275.6788 -30.3389 285.2670 -24.9461 288.6806  10.8509 299.6398  35.2456 262.9470 -33.9584 318.5137  -5.8002 299.6957 -19.8612 235.9168  34.4634 234.9716  -0.6600

 Webpage updated on: Tue Dec 15 18:25:31 EST 2015

IMY = -0.00708599426475 source in the event data image

data image of 15-350 keV band DECcent POSerr Theta Phi PeakCts SNR AngSep Name [deg] ['] [deg] [deg] ['] 2.1 40.2 -75.5 0.6505 5.6 2.3 Sco X-1 2.8 44.3 5.2 -0.2231 -4.1 4.7 Her X-1 0.0 30.8 -105.2 -0.0625 -1.3 12.3 GX 1+4 86.9 14.2 -56.2 0.0041 0.1 9.0 SW J1753.5-0127 9.3 27.4 -116.3 0.0493 1.2 7.1 GX 5-1 17.6 28.0 -117.1 0.0264 0.7 3.1 GRS 1758-258 6.6 16.2 -109.2 0.0557 1.8 10.3 GX 17+2 0.0 30.7 -129.5 0.0299 0.8 12.9 H1820-303 6.5 24.7 -147.0 -0.0593 -1.8 12.7 HT1900.1-2455 7.1 12.7 66.9 0.0530 1.6 9.0 GRS 1915+105 3.7 39.0 61.1 0.2894 3.1 3.6 Cyg X-1 3.5 38.3 -114.5 -0.2344 -3.3 7.7 GX 354-0 2.3 36.2 138.1 0.2974 5.0 ------ UNKNOWN 0.7 25.7 179.2 0.5937 16.8 ------ UNKNOWN 2.0 55.8 -7.8 0.6083 5.8 ------ UNKNOWN 2.5 47.6 -51.9 0.6279 4.5 ------ UNKNOWN

Analysis Summary

Notes:

Image

15.0-350.0 keV image (Event data)

Light Curves

Best duration plot

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