batgrbproduct Analysis for Trigger=553996
Analysis Summary
Notes:
- 1) No attempt has been made to eliminate the non-significant decimal places.
- 2) This batgrbproduct analysis is done of the amount of data for this trigger downloaded to date.
- 3) This batgrbproduct analysis is using the flight position for the mask-weighting calculation.
- 4) This page will be updated for up to 10 downlinks after the trigger.
======================================================================
BAT GRB EVENT DATA PROCESSING REPORT
Process Script Ver: batgrbproduct v2.46
Process Start Time (local time): Sat Apr 20 22:27:32 EDT 2013
Host Name: gcn5
Current Working Dir: /local/data/raid16/prebascript_archive/trigger553996/GCN5_download_cron
======================================================================
Trigger: 00553996 Segment: 000
BAT Trigger Time: 388155401.536 [s; MET]
Trigger Stop: 388155402.048 [s; MET]
UTC: 2013-04-20T12:56:31.073560 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 183.11962611028 Dec: 54.3864374361318 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 7.39
Image Trigger?: NO
Rate S/N Ratio: 12.6491106406735 [ if not an image trigger ]
Image S/N Ratio: 7.39
Flight Position: [ source = BAT ]
RA: 183.11962611028 Dec: 54.3864374361318 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 183.093984317433 Dec: 54.3725903745107 [deg; J2000]
{ 12h 12m 22.6s , +54d 22' 21.3" }
+/- 1.10472766038871 [arcmin] (estimated 90% radius based on SNR)
+/- 0.437524711078648 [arcmin] (formal 1-sigma fit error)
SNR: 26.3830619355683
Angular difference between Flight and Ground position is 1.221953 arcmin
Partial Coding Fraction: 1.015625 [ including projection effects ]
Duration
T90: 12.5479999184608 +/- 5.30662979430878
Measured from: -2.2639998793602
to: 10.2840000391006 [s; relative to TRIGTIME]
T50: 4.06399995088577 +/- 0.796843760780907
Measured from: 1.06400012969971
to: 5.12800008058548 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 0.912000000476837
to: 1.91200000047684 [s; relative to TRIGTIME]
Total Fluence
Measured from: -4.61599999666214
to: 16.0479999780655 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.260426 0.455902 0.365463 0.074088
0.024001 0.025636 0.022783 0.018686 [error]
Peak 0.044049 0.068750 0.060562 0.010679
0.005800 0.006532 0.006005 0.004473 [error]
[ fluence units of on-axis counts / fully illuminated detector ]
======================================================================
=== 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 Power-law 8.44e-08 1.67e-07 2.57e-07 8.62e-07 7.18e-07 1.37e-06 erg/cm2
Error 8.98e-09 1.13e-08 2.11e-08 1.48e-07 5.24e-08 1.65e-07 erg/cm2
Peak flux Power-law 3.99e-01 4.55e-01 3.72e-01 5.10e-01 1.41e+00 1.74e+00 ph/cm2/s
Error 6.82e-02 4.95e-02 4.59e-02 1.27e-01 1.43e-01 1.87e-01 ph/cm2/s
Fluence Cutoff-PL 6.81e-08 1.89e-07 2.75e-07 1.96e-07 6.56e-07 7.28e-07 erg/cm2
Error 1.08e-08 1.46e-08 2.50e-08 9.89e-08 5.62e-08 1.10e-07 erg/cm2
Peak flux Cutoff-PL 3.51e-01 4.90e-01 3.98e-01 2.40e-01 1.38e+00 1.48e+00 ph/cm2/s
Error 8.11e-02 6.10e-02 5.42e-02 1.80e-01 1.46e-01 2.26e-01 ph/cm2/s
Fluence Band 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 erg/cm2
Error 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 erg/cm2
Peak flux Band 1.55e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 ph/cm2/s
Error 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.380 0.105 - - 3.58e-03 2.34e-04 60.710 57
CPL 0.108 0.527 74.2 13.5 1.56e-02 1.01e-02 37.870 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.289 0.164 - - 1.19e-02 1.21e-03 60.020 57
CPL 0.561 0.737 100.2 224.1 2.76e-02 2.75e-02 56.540 56
Model : spectral model: simple power-law (PL) and cutoff power-law (CPL)
Ph_index : photon index: E^-{Ph_index} (minus sign is not included in the 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 PL model and at 1 keV in CPL model
Nomr_90err : 90% error of the normalization
chi2 : Chi-Squared
dof : degree of freedom
=== T90/T50 calculation in the 50-300 keV band (BATSE band) using 64 ms lc ===
T90 in the 50-300 keV band: 11.584000 sec.
T50 in the 50-300 keV band: 3.776000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 20.664 -4.616 16.048
T90 12.548 -2.264 10.284
T50 4.064 1.064 5.128
Peak 1.000 0.912 1.912
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
183.0940 +54.3726 0.0073 8.7 163.0 1.0484 26.4 TRIG_00553996
------------------------------------------
Foreground time interval of the image:
-4.616 8.965 (delta_t = 13.581 [sec])
Background time interval of the image:
-239.536 -4.616 (delta_t = 234.920 [sec])
Lightcurves
Notes:
- 1) All plots contain as much data as has been downloaded to date.
- 2) The mask-weighted light curves are using the flight position.
- 3) Multiple plots of different time binning/intervals are shown to cover all scenarios of short/long GRBs, rate/image triggers, and real/false positives.
- 4) For all the mask-weighted lightcurves, the y-axis units are counts/sec/det where a det is 0.4 x 0.4 = 0.16 sq cm.
- 5) The verticle lines correspond to following: green dotted lines are T50 interval, black dotted lines are T90 interval, blue solid line(s) is a spacecraft slew start time, and orange solid line(s) is a spacecraft slew end time.
- 6) Time of each bin is in the middle of the bin.
1 s binning
From T0-310 s to T0+310 s
From T100_start - 20 s to T100_end + 30 s
Full time interval
64 ms binning
Full time interval
From T100_start to T100_end
From T0-5 sec to T0+5 sec
16 ms binning
From T100_start-5 s to T100_start+5 s
8 ms binning
From T100_start-3 s to T100_start+3 s
2 ms binning
From T100_start-1 s to T100_start+1 s
SN=5 or 10 sec. binning (whichever binning is satisfied first)
SN=5 or 10 sec. binning (T < 200 sec)
Spectra
Notes:
- 1) The fitting includes the systematic errors.
- 2) For long bursts, a spectral fit of 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.
- 4) For short bursts (T90<1sec), the specrtum is also fit with Blackbody, OTTB, and Double Blackbody.
Time averaged spectrum fit using the pre-slew DRM
Power-law model
Time interval is from -4.616 sec. to 16.048 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.38027 ( -0.104473 0.104808 )
Norm@50keV : 3.58086E-03 ( -0.000234289 0.000233858 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 60.71 using 59 PHA bins.
# Reduced chi-squared = 1.065 for 57 degrees of freedom
# Null hypothesis probability = 3.438642e-01
Photon flux (15-150 keV) in 20.66 sec: 0.434170 ( -0.0281743 0.0281914 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.17788e-07 ( -5.21892e-08 5.25586e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -4.616 sec. to 16.048 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.108185 ( -0.559041 0.49491 )
Epeak [keV] : 74.2058 ( -9.68301 17.3418 )
Norm@50keV : 1.56224E-02 ( -0.00666956 0.0135701 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 37.87 using 59 PHA bins.
# Reduced chi-squared = 0.6762 for 56 degrees of freedom
# Null hypothesis probability = 9.698497e-01
Photon flux (15-150 keV) in 20.66 sec: 0.413300 ( -0.02924 0.029236 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.56279e-07 ( -5.5656e-08 5.67592e-08 ) ergs/cm2
Band function
Time interval is from -4.616 sec. to 16.048 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.107987 ( -0.320082 0.824408 )
beta : -10.0000 ( 10 1.77636e-15 )
Epeak [keV] : 74.1900 ( -9.67918 17.3595 )
Norm@50keV : 1.56273E-02 ( -0.00667213 0.0135819 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 37.87 using 59 PHA bins.
# Reduced chi-squared = 0.6885 for 55 degrees of freedom
# Null hypothesis probability = 9.622225e-01
Photon flux (15-150 keV) in 20.66 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 0 ( 0 0 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 15.8368 (-1.11739 1.21621)
R^2/D10^2 : 4.35831E-02 (-0.00983161 0.0125397)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 54.76 using 59 PHA bins.
# Reduced chi-squared = 0.9607 for 57 degrees of freedom
# Null hypothesis probability = 5.596156e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.680e-08 5.599e-09
25- 50 1.952e-07 1.567e-08
50-150 3.408e-07 4.277e-08
15-150 5.828e-07 4.525e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 200.000 ( )
Norm : 1.78727 (-0.115195 0.115196)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 57.79 using 59 PHA bins.
# Reduced chi-squared = 1.014 for 57 degrees of freedom
# Null hypothesis probability = 4.457137e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 9.237e-08 6.715e-09
25- 50 1.777e-07 1.690e-08
50-150 3.897e-07 1.067e-07
15-150 6.598e-07 1.039e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 6.19565 (-1.71867 2.61656)
R1^2/D10^2 : 0.397535 (-0.25883 0.872665)
kT2 [keV] : 19.6444 (-2.34186 3.94419)
R2^2/D10^2 : 1.79167E-02 (-0.00969792 0.00879587)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 35.68 using 59 PHA bins.
# Reduced chi-squared = 0.6488 for 55 degrees of freedom
# Null hypothesis probability = 9.798602e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 7.154e-08 2.890e-08
25- 50 1.833e-07 5.516e-08
50-150 3.943e-07 1.050e-07
15-150 6.491e-07 1.566e-07
Peak spectrum fit
Power-law model
Time interval is from 0.912 sec. to 1.912 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.28913 ( -0.163861 0.16438 )
Norm@50keV : 1.18604E-02 ( -0.00120876 0.00120571 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 60.02 using 59 PHA bins.
# Reduced chi-squared = 1.053 for 57 degrees of freedom
# Null hypothesis probability = 3.670044e-01
Photon flux (15-150 keV) in 1 sec: 1.41218 ( -0.142748 0.142805 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.17516e-07 ( -1.35178e-08 1.36471e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.912 sec. to 1.912 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.560510 ( -0.802285 0.670759 )
Epeak [keV] : 100.241 ( -29.6179 418.633 )
Norm@50keV : 2.76158E-02 ( -0.0146938 0.0403949 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 56.54 using 59 PHA bins.
# Reduced chi-squared = 1.010 for 56 degrees of freedom
# Null hypothesis probability = 4.548226e-01
Photon flux (15-150 keV) in 1 sec: 1.38190 ( -0.1465 0.14593 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.1201e-07 ( -1.46981e-08 1.4742e-08 ) ergs/cm2
Band function
Time interval is from 0.912 sec. to 1.912 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.461834 ( -0.569109 0.461195 )
beta : -1.92862 ( 1.93574 0.671051 )
Epeak [keV] : 91.0602 ( -64.4713 348.57 )
Norm@50keV : 3.15681E-02 ( -0.0192527 141.335 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 56.44 using 59 PHA bins.
# Reduced chi-squared = 1.026 for 55 degrees of freedom
# Null hypothesis probability = 4.207929e-01
Photon flux (15-150 keV) in 1 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 0 ( 0 0 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 16.5911 (-1.93226 2.23857)
R^2/D10^2 : 0.122496 (-0.042604 0.0633195)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 69.25 using 59 PHA bins.
# Reduced chi-squared = 1.215 for 57 degrees of freedom
# Null hypothesis probability = 1.280334e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 6.912e-09 1.425e-09
25- 50 2.998e-08 3.990e-09
50-150 5.845e-08 1.151e-08
15-150 9.535e-08 1.288e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 200.000 ( )
Norm : 5.74862 (-0.586183 0.586184)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 64.34 using 59 PHA bins.
# Reduced chi-squared = 1.129 for 57 degrees of freedom
# Null hypothesis probability = 2.350749e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.440e-08 7.910e-09
25- 50 2.770e-08 1.360e-08
50-150 6.076e-08 3.086e-08
15-150 1.029e-07 4.161e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 6.83501 (-2.82805 5.51705)
R1^2/D10^2 : 1.10751 (-0.849394 5.97287)
kT2 [keV] : 23.3526 (-5.22835 33.6132)
R2^2/D10^2 : 3.19853E-02 (-0.0299785 0.050956)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 56.83 using 59 PHA bins.
# Reduced chi-squared = 1.033 for 55 degrees of freedom
# Null hypothesis probability = 4.067130e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.124e-08 6.230e-09
25- 50 2.776e-08 1.441e-08
50-150 7.150e-08 3.737e-08
15-150 1.105e-07 4.944e-08
Plot creation:
Sat Apr 20 23:21:26 EDT 2013