batgrbproduct Analysis for Trigger=621234
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 Dec 13 03:29:53 EST 2014
Host Name: bat1
Current Working Dir: /local/data/bat1/prebascript/trigger621234/GCN5_download_cron
======================================================================
Trigger: 00621234 Segment: 000
BAT Trigger Time: 440083441.152 [s; MET]
Trigger Stop: 440083442.176 [s; MET]
UTC: 2014-12-12T13:23:48.244720 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 250.868604999012 Dec: 31.7493121278424 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 7.17
Image Trigger?: NO
Rate S/N Ratio: 11.7473401244707 [ if not an image trigger ]
Image S/N Ratio: 7.17
Flight Position: [ source = BAT ]
RA: 250.868604999012 Dec: 31.7493121278424 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 250.866109118852 Dec: 31.7485392763641 [deg; J2000]
{ 16h 43m 27.9s , +31d 44' 54.7" }
+/- 0.979977721705773 [arcmin] (estimated 90% radius based on SNR)
+/- 0.366435310072973 [arcmin] (formal 1-sigma fit error)
SNR: 31.3088172568675
Angular difference between Flight and Ground position is 0.135524 arcmin
Partial Coding Fraction: 0.7734375 [ including projection effects ]
Duration
T90: 10.5079999566078 +/- 0.685623802051872
Measured from: 0.760000109672546
to: 11.2680000662804 [s; relative to TRIGTIME]
T50: 2.24799996614456 +/- 0.599212802618918
Measured from: 4.10800009965897
to: 6.35600006580353 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 4.09999996423721
to: 5.09999996423721 [s; relative to TRIGTIME]
Total Fluence
Measured from: -0.0600000023841858
to: 12.1359999775887 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.446994 0.700909 0.544698 0.110945
0.029712 0.031315 0.028076 0.022398 [error]
Peak 0.086142 0.183306 0.176338 0.050381
0.009466 0.010950 0.010715 0.007643 [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 1.53e-07 2.87e-07 4.18e-07 1.29e-06 1.19e-06 2.15e-06 erg/cm2
Error 1.39e-08 1.58e-08 2.71e-08 1.82e-07 6.63e-08 2.01e-07 erg/cm2
Peak flux Power-law 9.57e-01 1.21e+00 1.12e+00 1.82e+00 3.91e+00 5.11e+00 ph/cm2/s
Error 1.18e-01 9.38e-02 8.17e-02 2.72e-01 2.62e-01 3.58e-01 ph/cm2/s
Fluence Cutoff-PL 1.42e-07 2.98e-07 4.30e-07 7.41e-07 1.15e-06 1.61e-06 erg/cm2
Error 1.65e-08 1.86e-08 2.98e-08 3.58e-07 7.23e-08 3.60e-07 erg/cm2
Peak flux Cutoff-PL 8.13e-01 1.29e+00 1.22e+00 9.11e-01 3.83e+00 4.23e+00 ph/cm2/s
Error 1.42e-01 1.09e-01 1.02e-01 3.69e-01 2.67e-01 4.44e-01 ph/cm2/s
Fluence Band 1.40e-07 2.97e-07 4.30e-07 7.55e-07 1.15e-06 1.63e-06 erg/cm2
Error -------- -------- -------- -------- -------- -------- erg/cm2
Peak flux Band -------- -------- -------- -------- -------- -------- ph/cm2/s
Error -------- -------- -------- -------- -------- -------- ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.460 0.089 - - 1.02e-02 5.21e-04 47.770 57
CPL 1.066 0.353 121.9 190.4 1.59e-02 6.47e-03 43.750 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.113 0.106 - - 3.37e-02 2.20e-03 60.560 57
CPL 0.375 0.470 120.4 61.7 7.49e-02 3.94e-02 51.940 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: 10.176000 sec.
T50 in the 50-300 keV band: 1.664000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 12.196 -0.060 12.136
T90 10.508 0.760 11.268
T50 2.248 4.108 6.356
Peak 1.000 4.100 5.100
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
250.8661 +31.7485 0.0061 30.2 0.6 1.6194 31.3 TRIG_00621234
------------------------------------------
Foreground time interval of the image:
-0.060 9.349 (delta_t = 9.409 [sec])
Background time interval of the image:
-239.152 -0.060 (delta_t = 239.092 [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 -0.060 sec. to 12.136 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.46002 ( -0.0887914 0.0888986 )
Norm@50keV : 1.01748E-02 ( -0.000521628 0.000521064 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 47.77 using 59 PHA bins.
# Reduced chi-squared = 0.8380 for 57 degrees of freedom
# Null hypothesis probability = 8.032072e-01
Photon flux (15-150 keV) in 12.2 sec: 1.25705 ( -0.0662818 0.0663861 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.1857e-06 ( -6.61345e-08 6.63889e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.060 sec. to 12.136 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.06562 ( -0.367583 0.339065 )
Epeak [keV] : 121.948 ( -36.061 344.762 )
Norm@50keV : 1.59153E-02 ( -0.0049652 0.00797079 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 43.75 using 59 PHA bins.
# Reduced chi-squared = 0.7813 for 56 degrees of freedom
# Null hypothesis probability = 8.829643e-01
Photon flux (15-150 keV) in 12.2 sec: 1.23303 ( -0.06928 0.06932 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.15387e-06 ( -7.24033e-08 7.21862e-08 ) ergs/cm2
Band function
Time interval is from -0.060 sec. to 12.136 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.06561 ( -0.28111 0.160718 )
beta : -10.0000 ( 10 7.10543e-15 )
Epeak [keV] : 121.929 ( -24.535 346.695 )
Norm@50keV : 1.59139E-02 ( -0.00496423 0.00797238 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 43.75 using 59 PHA bins.
# Reduced chi-squared = 0.7955 for 55 degrees of freedom
# Null hypothesis probability = 8.623123e-01
Photon flux (15-150 keV) in 12.2 sec: 1.23232 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 1.15451e-06 ( 0 0 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 15.7767 ( )
R^2/D10^2 : 0.119481 ( )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 122.95 using 59 PHA bins.
# Reduced chi-squared = 2.1570 for 57 degrees of freedom
# Null hypothesis probability = 9.567145e-07
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 7.525e-08 7.607e-09
25- 50 3.128e-07 2.086e-08
50-150 5.413e-07 5.344e-08
15-150 9.293e-07 5.862e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 200.000 ( )
Norm : 5.16158 (-0.263667 0.263673)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 47.55 using 59 PHA bins.
# Reduced chi-squared = 0.8343 for 57 degrees of freedom
# Null hypothesis probability = 8.094003e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.575e-07 9.028e-09
25- 50 3.030e-07 1.732e-08
50-150 6.645e-07 4.776e-08
15-150 1.125e-06 7.570e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 7.63394 (-1.16234 1.28134)
R1^2/D10^2 : 0.936389 (-0.363632 0.679811)
kT2 [keV] : 27.9558 (-4.2886 6.70451)
R2^2/D10^2 : 1.28656E-02 (-0.00676367 0.0108121)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 40.14 using 59 PHA bins.
# Reduced chi-squared = 0.7297 for 55 degrees of freedom
# Null hypothesis probability = 9.338002e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.360e-07 2.474e-08
25- 50 3.067e-07 4.593e-08
50-150 7.196e-07 1.755e-07
15-150 1.162e-06 1.972e-07
Peak spectrum fit
Power-law model
Time interval is from 4.100 sec. to 5.100 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.11261 ( -0.106815 0.105591 )
Norm@50keV : 3.36810E-02 ( -0.00220341 0.00220274 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 60.56 using 59 PHA bins.
# Reduced chi-squared = 1.062 for 57 degrees of freedom
# Null hypothesis probability = 3.486742e-01
Photon flux (15-150 keV) in 1 sec: 3.91169 ( -0.261859 0.262092 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.50737e-07 ( -2.50358e-08 2.51231e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 4.100 sec. to 5.100 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.374885 ( -0.496223 0.443677 )
Epeak [keV] : 120.386 ( -28.3942 94.9972 )
Norm@50keV : 7.49417E-02 ( -0.0280135 0.0507979 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 51.94 using 59 PHA bins.
# Reduced chi-squared = 0.9276 for 56 degrees of freedom
# Null hypothesis probability = 6.291358e-01
Photon flux (15-150 keV) in 1 sec: 3.82708 ( -0.26733 0.2673 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.38548e-07 ( -2.6913e-08 2.6754e-08 ) ergs/cm2
Band function
Time interval is from 4.100 sec. to 5.100 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 1.78269 ( -1.44354 -0.83479 )
beta : -1.36645 ( 1.39206 0.20804 )
Epeak [keV] : 46.5029 ( -21.1278 93.0393 )
Norm@50keV : 1.94700 ( -1.91191 174.136 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 49.78 using 59 PHA bins.
# Reduced chi-squared = 0.9051 for 55 degrees of freedom
# Null hypothesis probability = 6.737239e-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] : 19.4327 (-1.56281 1.74326)
R^2/D10^2 : 0.208075 (-0.0511025 0.0660572)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 78.58 using 59 PHA bins.
# Reduced chi-squared = 1.379 for 57 degrees of freedom
# Null hypothesis probability = 3.064777e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.532e-08 1.985e-09
25- 50 7.483e-08 6.565e-09
50-150 2.085e-07 2.270e-08
15-150 2.987e-07 2.480e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 200.000 ( )
Norm : 16.0126 (-1.08022 1.08014)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 100.58 using 59 PHA bins.
# Reduced chi-squared = 1.7645 for 57 degrees of freedom
# Null hypothesis probability = 3.282200e-04
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.988e-08 3.090e-09
25- 50 7.671e-08 9.420e-09
50-150 1.682e-07 4.871e-08
15-150 2.848e-07 5.440e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 9.85686 (-2.4999 3.07255)
R1^2/D10^2 : 1.01327 (-0.486592 1.19668)
kT2 [keV] : 32.6481 (-7.3425 22.301)
R2^2/D10^2 : 2.94683E-02 (-0.0237772 0.0446937)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 49.53 using 59 PHA bins.
# Reduced chi-squared = 0.9006 for 55 degrees of freedom
# Null hypothesis probability = 6.827005e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.461e-08 9.098e-09
25- 50 7.829e-08 2.134e-08
50-150 2.396e-07 1.035e-07
15-150 3.425e-07 1.275e-07
Plot creation:
Sat Dec 13 03:35:41 EST 2014