batgrbproduct Analysis for Trigger=638808
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 Apr 24 08:12:35 EDT 2015
Host Name: bat1
Current Working Dir: /local/data/bat1/prebascript/trigger638808/GCN5_download_cron
======================================================================
Trigger: 00638808 Segment: 000
BAT Trigger Time: 451463298.176 [s; MET]
Trigger Stop: 451463298.432 [s; MET]
UTC: 2015-04-23T06:28:04.692100 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 221.600452494162 Dec: 12.2883046095778 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 10.41
Image Trigger?: NO
Rate S/N Ratio: 41.2431812546026 [ if not an image trigger ]
Image S/N Ratio: 10.41
Flight Position: [ source = BAT ]
RA: 221.600452494162 Dec: 12.2883046095778 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 221.60148202937 Dec: 12.264825377864 [deg; J2000]
{ 14h 46m 24.4s , +12d 15' 53.4" }
+/- 1.86594058528002 [arcmin] (estimated 90% radius based on SNR)
+/- 0.832985175376475 [arcmin] (formal 1-sigma fit error)
SNR: 12.4773255683808
Angular difference between Flight and Ground position is 1.410046 arcmin
Partial Coding Fraction: 0.9296875 [ including projection effects ]
Duration
T90: 0.215999901294708 +/- 0.0282842442734789
Measured from: 0.0120001435279846
to: 0.228000044822693 [s; relative to TRIGTIME]
T50: 0.119999945163727 +/- 0.030463099373373
Measured from: 0.0720001459121704
to: 0.192000091075897 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: -0.374000012874603
to: 0.625999987125397 [s; relative to TRIGTIME]
Total Fluence
Measured from: 0.00800001621246338
to: 0.240000009536743 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.011809 0.028803 0.040808 0.015643
0.003369 0.004124 0.004358 0.003601 [error]
Peak 0.016772 0.033722 0.050975 0.011420
0.006065 0.006585 0.006024 0.005206 [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 3.76e-09 1.05e-08 2.36e-08 1.42e-07 6.36e-08 1.80e-07 erg/cm2
Error 1.05e-09 1.78e-09 3.75e-09 5.06e-08 1.02e-08 5.28e-08 erg/cm2
Peak flux Power-law 1.72e-01 2.51e-01 2.72e-01 5.51e-01 8.64e-01 1.25e+00 ph/cm2/s
Error 5.90e-02 5.25e-02 4.62e-02 2.07e-01 1.42e-01 2.30e-01 ph/cm2/s
Fluence Cutoff-PL 2.83e-09 1.11e-08 2.66e-08 4.61e-08 6.13e-08 8.66e-08 erg/cm2
Error 1.33e-09 2.11e-09 4.91e-09 5.95e-08 1.08e-08 5.94e-08 erg/cm2
Peak flux Cutoff-PL 1.29e-01 2.58e-01 3.02e-01 2.46e-01 8.28e-01 9.35e-01 ph/cm2/s
Error 7.47e-02 6.04e-02 6.09e-02 -------- 1.51e-01 3.24e-01 ph/cm2/s
Fluence Band -------- -------- -------- -------- -------- -------- erg/cm2
Error -------- -------- -------- -------- -------- -------- erg/cm2
Peak flux Band 1.33e-01 2.57e-01 3.00e-01 2.72e-01 8.33e-01 9.64e-01 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 0.827 0.238 - - 2.37e-02 3.43e-03 94.450 57
CPL -0.250 1.219 123.5 1094.1 6.92e-02 1.10e-01 91.370 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 0.882 0.284 - - 7.53e-03 1.24e-03 57.900 57
CPL -0.099 1.440 125.8 -39.7 1.98e-02 5.00e-02 56.130 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: 0.192000 sec.
T50 in the 50-300 keV band: 0.128000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 0.232 0.008 0.240
T90 0.216 0.012 0.228
T50 0.120 0.072 0.192
Peak 1.000 -0.374 0.626
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
221.6015 +12.2648 0.0154 12.3 57.6 0.0985 12.5 TRIG_00638808
------------------------------------------
Foreground time interval of the image:
0.008 0.240 (delta_t = 0.232 [sec])
Background time interval of the image:
-239.176 -56.606 (delta_t = 182.570 [sec])
-55.176 0.008 (delta_t = 55.184 [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 0.008 sec. to 0.240 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.827218 ( -0.241602 0.234667 )
Norm@50keV : 2.37432E-02 ( -0.00343126 0.0034197 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 94.45 using 59 PHA bins.
# Reduced chi-squared = 1.657 for 57 degrees of freedom
# Null hypothesis probability = 1.335851e-03
Photon flux (15-150 keV) in 0.232 sec: 2.72667 ( -0.390989 0.391226 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.3646e-08 ( -1.01683e-08 1.02677e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.008 sec. to 0.240 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -0.249853 ( -1.39068 1.04636 )
Epeak [keV] : 123.504 ( -38.9511 2149.32 )
Norm@50keV : 6.91655E-02 ( -0.0440988 0.175395 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 91.37 using 59 PHA bins.
# Reduced chi-squared = 1.632 for 56 degrees of freedom
# Null hypothesis probability = 1.986517e-03
Photon flux (15-150 keV) in 0.232 sec: 2.64386 ( -0.40367 0.40148 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.12564e-08 ( -1.07824e-08 1.08012e-08 ) ergs/cm2
Band function
Time interval is from 0.008 sec. to 0.240 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 0.174006 ( -0.470351 1.19287 )
beta : -10.0000 ( 10 3.55271e-15 )
Epeak [keV] : 129.098 ( -33.2733 383.451 )
Norm@50keV : 6.39300E-02 ( -0.0389974 0.181698 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 91.38 using 59 PHA bins.
# Reduced chi-squared = 1.661 for 55 degrees of freedom
# Null hypothesis probability = 1.494951e-03
Photon flux (15-150 keV) in 0.232 sec: 2.64376 ( ) 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] : 23.9313 (-3.86762 4.99699)
R^2/D10^2 : 8.18013E-02 (-0.0352671 0.0572554)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 92.97 using 59 PHA bins.
# Reduced chi-squared = 1.631 for 57 degrees of freedom
# Null hypothesis probability = 1.847358e-03
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.931e-09 5.748e-10
25- 50 1.071e-08 2.275e-09
50-150 4.571e-08 1.179e-08
15-150 5.835e-08 1.299e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 199.363 ( )
Norm : 10.0413 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 116.40 using 59 PHA bins.
# Reduced chi-squared = 2.0422 for 57 degrees of freedom
# Null hypothesis probability = 5.845409e-06
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.801e-09 3.316e-09
25- 50 1.116e-08 6.422e-09
50-150 2.447e-08 1.401e-08
15-150 4.143e-08 2.329e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 5.20619 (-5.20644 -5.20644)
R1^2/D10^2 : 2.60706 (-2.60668 -2.60668)
kT2 [keV] : 26.7526 (-5.33332 170.873)
R2^2/D10^2 : 5.56110E-02 (-0.0556097 0.0434025)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 90.42 using 59 PHA bins.
# Reduced chi-squared = 1.644 for 55 degrees of freedom
# Null hypothesis probability = 1.848237e-03
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.270e-09 1.666e-09
25- 50 1.031e-08 4.540e-09
50-150 4.756e-08 2.086e-08
15-150 6.114e-08 2.693e-08
Peak spectrum fit
Power-law model
Time interval is from -0.374 sec. to 0.626 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.882094 ( -0.291503 0.275726 )
Norm@50keV : 7.53189E-03 ( -0.00124619 0.00123461 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 57.90 using 59 PHA bins.
# Reduced chi-squared = 1.016 for 57 degrees of freedom
# Null hypothesis probability = 4.418528e-01
Photon flux (15-150 keV) in 1 sec: 0.864411 ( -0.141898 0.142489 ) ph/cm2/s
Energy fluence (15-150 keV) : 8.51221e-08 ( -1.47452e-08 1.49009e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.374 sec. to 0.626 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -9.94456E-02 ( -1.78874 1.0914 )
Epeak [keV] : 125.832 ( -46.4245 -125.83 )
Norm@50keV : 1.98055E-02 ( -0.019806 0.0801214 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 56.13 using 59 PHA bins.
# Reduced chi-squared = 1.002 for 56 degrees of freedom
# Null hypothesis probability = 4.699503e-01
Photon flux (15-150 keV) in 1 sec: 0.827530 ( -0.152175 0.150746 ) ph/cm2/s
Energy fluence (15-150 keV) : 8.1061e-08 ( -1.62219e-08 1.60792e-08 ) ergs/cm2
Band function
Time interval is from -0.374 sec. to 0.626 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 8.96332E-02 ( -0.930791 1.37302 )
beta : -10.0000 ( 10 7.81597e-14 )
Epeak [keV] : 126.404 ( -34.9973 384.59 )
Norm@50keV : 1.96541E-02 ( -0.0196367 0.0803612 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 56.13 using 59 PHA bins.
# Reduced chi-squared = 1.021 for 55 degrees of freedom
# Null hypothesis probability = 4.322569e-01
Photon flux (15-150 keV) in 1 sec: 0.833459 ( ) 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] : 23.1551 (-4.24511 5.917)
R^2/D10^2 : 2.74972E-02 (-0.0137353 0.0243296)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 57.61 using 59 PHA bins.
# Reduced chi-squared = 1.011 for 57 degrees of freedom
# Null hypothesis probability = 4.523135e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.663e-09 9.180e-10
25- 50 1.450e-08 4.597e-09
50-150 5.807e-08 1.895e-08
15-150 7.523e-08 2.307e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 200.000 ( )
Norm : 3.43222 (-0.58978 0.589747)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 72.50 using 59 PHA bins.
# Reduced chi-squared = 1.272 for 57 degrees of freedom
# Null hypothesis probability = 8.086583e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 8.546e-09 4.895e-09
25- 50 1.644e-08 9.430e-09
50-150 3.605e-08 2.061e-08
15-150 6.104e-08 3.460e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 5.03048 (-5.03052 -5.03052)
R1^2/D10^2 : 1.00373 (-1.00371 -1.00371)
kT2 [keV] : 25.6923 (-5.86976 -25.6923)
R2^2/D10^2 : 1.91495E-02 (-0.0191494 0.0212665)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 55.88 using 59 PHA bins.
# Reduced chi-squared = 1.016 for 55 degrees of freedom
# Null hypothesis probability = 4.413957e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.665e-09 2.587e-09
25- 50 1.410e-08 6.515e-09
50-150 6.072e-08 3.457e-08
15-150 7.949e-08 3.544e-08
Plot creation:
Fri Apr 24 08:15:56 EDT 2015