batgrbproduct Analysis for Trigger=630876
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): Fri Feb 13 04:31:29 EST 2015
Host Name: bat1
Current Working Dir: /local/data/bat1/prebascript/trigger630876/GCN5_download_cron
======================================================================
Trigger: 00630876 Segment: 000
BAT Trigger Time: 445431452.224 [s; MET]
Trigger Stop: 445431452.736 [s; MET]
UTC: 2015-02-12T10:57:19.047700 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 285.521339180983 Dec: 47.407424552007 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 7.9
Image Trigger?: NO
Rate S/N Ratio: 18.5472369909914 [ if not an image trigger ]
Image S/N Ratio: 7.9
Flight Position: [ source = BAT ]
RA: 285.521339180983 Dec: 47.407424552007 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 285.490552502772 Dec: 47.384391076634 [deg; J2000]
{ 19h 01m 57.7s , +47d 23' 03.8" }
+/- 1.11290779829678 [arcmin] (estimated 90% radius based on SNR)
+/- 0.496399011282676 [arcmin] (formal 1-sigma fit error)
SNR: 26.1064677415542
Angular difference between Flight and Ground position is 1.863734 arcmin
Partial Coding Fraction: 0.7109375 [ including projection effects ]
Duration
T90: 14.5120000243187 +/- 3.20519580051343
Measured from: 0.248000144958496
to: 14.7600001692772 [s; relative to TRIGTIME]
T50: 5.15200006961823 +/- 0.780235838101835
Measured from: 1.62400013208389
to: 6.77600020170212 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 0.828000009059906
to: 1.82800000905991 [s; relative to TRIGTIME]
Total Fluence
Measured from: -0.296000003814697
to: 18.9360000491142 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.370215 0.552267 0.424069 0.088964
0.026713 0.028409 0.025329 0.021564 [error]
Peak 0.046823 0.102184 0.073344 0.015549
0.006580 0.007581 0.006914 0.005503 [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 1.21e-07 2.21e-07 3.12e-07 9.22e-07 8.92e-07 1.57e-06 erg/cm2
Error 1.24e-08 1.37e-08 2.49e-08 1.59e-07 5.97e-08 1.78e-07 erg/cm2
Peak flux Power-law 5.24e-01 6.09e-01 5.09e-01 7.17e-01 1.90e+00 2.36e+00 ph/cm2/s
Error 8.55e-02 6.12e-02 5.53e-02 1.62e-01 1.73e-01 2.27e-01 ph/cm2/s
Fluence Cutoff-PL 1.16e-07 2.27e-07 3.16e-07 6.37e-07 8.75e-07 1.30e-06 erg/cm2
Error 1.45e-08 1.63e-08 2.65e-08 -------- 6.65e-08 3.27e-07 erg/cm2
Peak flux Cutoff-PL 5.06e-01 6.22e-01 5.19e-01 5.56e-01 1.89e+00 2.20e+00 ph/cm2/s
Error 9.59e-02 5.44e-02 6.29e-02 2.62e-01 1.77e-01 3.45e-01 ph/cm2/s
Fluence Band -------- -------- -------- -------- -------- -------- 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 1.505 0.106 - - 4.89e-03 2.96e-04 48.430 57
CPL 1.268 0.362 154.7 -42.3 6.44e-03 3.18e-03 47.420 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.259 0.154 - - 1.60e-02 1.45e-03 62.720 57
CPL 1.054 0.471 235.5 0.0 2.03e-02 1.40e-02 62.380 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: 12.608000 sec.
T50 in the 50-300 keV band: 4.352000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 19.232 -0.296 18.936
T90 14.512 0.248 14.760
T50 5.152 1.624 6.776
Peak 1.000 0.828 1.828
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
285.4906 +47.3844 0.0074 20.5 -94.3 1.4490 26.1 TRIG_00630876
------------------------------------------
Foreground time interval of the image:
-0.296 18.936 (delta_t = 19.232 [sec])
Background time interval of the image:
-239.224 -51.614 (delta_t = 187.610 [sec])
-50.224 -0.296 (delta_t = 49.928 [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 -0.296 sec. to 18.936 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.50526 ( -0.10599 0.106766 )
Norm@50keV : 4.89350E-03 ( -0.000296842 0.000295748 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 48.43 using 59 PHA bins.
# Reduced chi-squared = 0.8497 for 57 degrees of freedom
# Null hypothesis probability = 7.833324e-01
Photon flux (15-150 keV) in 19.23 sec: 0.611768 ( -0.036762 0.0368045 ) ph/cm2/s
Energy fluence (15-150 keV) : 8.91932e-07 ( -5.94951e-08 5.98957e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.296 sec. to 18.936 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.26829 ( -0.433913 0.289924 )
Epeak [keV] : 154.660 ( -70.1571 -154.664 )
Norm@50keV : 6.44236E-03 ( -0.00229009 0.00407366 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 47.42 using 59 PHA bins.
# Reduced chi-squared = 0.8467 for 56 degrees of freedom
# Null hypothesis probability = 7.860178e-01
Photon flux (15-150 keV) in 19.23 sec: 0.604299 ( -0.038795 0.038763 ) ph/cm2/s
Energy fluence (15-150 keV) : 8.75025e-07 ( -6.65858e-08 6.64454e-08 ) ergs/cm2
Band function
Time interval is from -0.296 sec. to 18.936 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.636277 ( 0.774649 5.76571 )
beta : -1.58951 ( 1.58631 0.158484 )
Epeak [keV] : 52.4395 ( -52.6535 604.114 )
Norm@50keV : 1.74318E-02 ( -0.0179615 404465 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 47.12 using 59 PHA bins.
# Reduced chi-squared = 0.8566 for 55 degrees of freedom
# Null hypothesis probability = 7.662784e-01
Photon flux (15-150 keV) in 19.23 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] : 15.0276 (-1.17636 1.28884)
R^2/D10^2 : 6.76147E-02 (-0.0168938 0.0224058)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 113.16 using 59 PHA bins.
# Reduced chi-squared = 1.9852 for 57 degrees of freedom
# Null hypothesis probability = 1.393328e-05
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 6.146e-08 7.557e-09
25- 50 2.446e-07 1.856e-08
50-150 3.763e-07 4.519e-08
15-150 6.823e-07 5.250e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 200.000 ( )
Norm : 2.49282 (-0.146445 0.146445)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 48.14 using 59 PHA bins.
# Reduced chi-squared = 0.8446 for 57 degrees of freedom
# Null hypothesis probability = 7.919955e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.196e-07 8.173e-09
25- 50 2.301e-07 2.125e-08
50-150 5.047e-07 1.007e-07
15-150 8.545e-07 1.257e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 6.72567 (-1.18181 1.35659)
R1^2/D10^2 : 0.709150 (-0.323504 0.70052)
kT2 [keV] : 25.4860 (-4.01447 6.47469)
R2^2/D10^2 : 8.65304E-03 (-0.00474431 0.00443349)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 46.48 using 59 PHA bins.
# Reduced chi-squared = 0.8451 for 55 degrees of freedom
# Null hypothesis probability = 7.864283e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.135e-07 2.663e-08
25- 50 2.266e-07 4.189e-08
50-150 5.284e-07 1.619e-07
15-150 8.684e-07 1.806e-07
Peak spectrum fit
Power-law model
Time interval is from 0.828 sec. to 1.828 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.25946 ( -0.154218 0.153378 )
Norm@50keV : 1.60405E-02 ( -0.00145108 0.00144815 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 62.72 using 59 PHA bins.
# Reduced chi-squared = 1.100 for 57 degrees of freedom
# Null hypothesis probability = 2.806193e-01
Photon flux (15-150 keV) in 1 sec: 1.90012 ( -0.173223 0.173343 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.60136e-07 ( -1.63445e-08 1.64721e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.828 sec. to 1.828 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.05447 ( -0.656378 0.285614 )
Epeak [keV] : 235.506 ( -235.587 -235.587 )
Norm@50keV : 2.03438E-02 ( -0.0055762 0.0223341 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 62.38 using 59 PHA bins.
# Reduced chi-squared = 1.114 for 56 degrees of freedom
# Null hypothesis probability = 2.599673e-01
Photon flux (15-150 keV) in 1 sec: 1.88680 ( -0.17754 0.17729 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.57776e-07 ( -1.8121e-08 1.7814e-08 ) ergs/cm2
Band function
Time interval is from 0.828 sec. to 1.828 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 1.29518 ( -0.450262 -0.450262 )
beta : -1.42787 ( 1.4136 0.223576 )
Epeak [keV] : 40.3972 ( -14.7516 127.461 )
Norm@50keV : 0.773233 ( -0.89716 154.825 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 59.90 using 59 PHA bins.
# Reduced chi-squared = 1.089 for 55 degrees of freedom
# Null hypothesis probability = 3.023663e-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] : 16.6454 (-1.95407 2.29488)
R^2/D10^2 : 0.158497 (-0.055832 0.0831949)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 88.50 using 59 PHA bins.
# Reduced chi-squared = 1.553 for 57 degrees of freedom
# Null hypothesis probability = 4.738510e-03
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 8.994e-09 1.648e-09
25- 50 3.912e-08 5.045e-09
50-150 7.685e-08 1.358e-08
15-150 1.250e-07 1.540e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 200.000 ( )
Norm : 7.79617 (-0.709617 0.709593)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 71.51 using 59 PHA bins.
# Reduced chi-squared = 1.255 for 57 degrees of freedom
# Null hypothesis probability = 9.348694e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.941e-08 7.209e-09
25- 50 3.734e-08 1.465e-08
50-150 8.189e-08 3.757e-08
15-150 1.386e-07 6.606e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 9.17992 (-2.29496 2.87503)
R1^2/D10^2 : 0.802893 (-0.41407 1.00218)
kT2 [keV] : 40.7314 (-15.7777 -42.2084)
R2^2/D10^2 : 6.59224E-03 (-0.00516372 0.0121317)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 59.94 using 59 PHA bins.
# Reduced chi-squared = 1.090 for 55 degrees of freedom
# Null hypothesis probability = 3.011265e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.470e-08 4.948e-09
25- 50 3.871e-08 1.218e-08
50-150 1.051e-07 5.023e-08
15-150 1.586e-07 7.121e-08
Plot creation:
Fri Feb 13 04:35:25 EST 2015