batgrbproduct Analysis for Trigger=614903
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 Oct 11 06:23:26 EDT 2014
Host Name: bat1
Current Working Dir: /local/data/bat1/prebascript/trigger614903/GCN5_download_cron
======================================================================
Trigger: 00614903 Segment: 000
BAT Trigger Time: 434646272 [s; MET]
Trigger Stop: 434646336 [s; MET]
UTC: 2014-10-10T15:04:19.362940 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 268.607298906236 Dec: -26.3304414092534 [deg; J2000]
Catalogged Source?: YES
Point Source?: YES
GRB Indicated?: NO [ by BAT flight software ]
Image S/N Ratio: 19.82
Image Trigger?: YES
Rate S/N Ratio: 0 [ if not an image trigger ]
Image S/N Ratio: 19.82
Flight Position: [ source = BAT ]
RA: 268.607298906236 Dec: -26.3304414092534 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 268.617412273494 Dec: -26.300553838538 [deg; J2000]
{ 17h 54m 28.2s , -26d 18' 02.0" }
+/- 1.59828832977423 [arcmin] (estimated 90% radius based on SNR)
+/- 0.883004172293351 [arcmin] (formal 1-sigma fit error)
SNR: 15.5661955622052
Angular difference between Flight and Ground position is 1.873928 arcmin
Partial Coding Fraction: 0.8828125 [ including projection effects ]
Duration
T90: 418.103999972343 +/- 11.728350072637
Measured from: 40.1760001182556
to: 458.280000090599 [s; relative to TRIGTIME]
T50: 196.303999900818 +/- 8.41843930777067
Measured from: 119.452000141144
to: 315.756000041962 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 181.004000008106
to: 182.004000008106 [s; relative to TRIGTIME]
Total Fluence
Measured from: -8.77600002288818
to: 493.068000018597 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 18.743963 6.380338 0.247928 0.057003
0.165611 0.147899 0.119286 0.101223 [error]
Peak 0.080706 0.034876 0.008482 -0.002425
0.007407 0.006196 0.004877 0.004012 [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 7.44e-06 2.51e-06 4.76e-07 1.06e-07 1.05e-05 1.05e-05 erg/cm2
Error -------- -------- -------- -------- -------- -------- erg/cm2
Peak flux Power-law 8.90e-01 2.88e-01 5.18e-02 1.09e-02 1.24e+00 1.24e+00 ph/cm2/s
Error 1.45e-01 6.32e-02 2.54e-02 9.42e-03 1.77e-01 1.78e-01 ph/cm2/s
Fluence Cutoff-PL 6.38e-06 2.57e-06 9.10e-08 6.79e-11 9.04e-06 9.04e-06 erg/cm2
Error 5.06e-07 1.23e-07 4.21e-08 2.07e-10 5.37e-07 5.37e-07 erg/cm2
Peak flux Cutoff-PL 8.91e-01 2.93e-01 3.45e-02 1.65e-03 1.22e+00 1.22e+00 ph/cm2/s
Error 1.49e-01 7.80e-02 3.92e-02 1.10e-02 1.79e-01 1.79e-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 4.398 0.000 - - 7.00e-04 0.00e+00 128.070 57
CPL 1.000 0.000 50.0 0.0 3.41e-03 0.00e+00 1261.090 56
The chi2 of BB fit is 71.59 which shows a significant improvement in the fit over a PL.
Check the BB fit.
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 3.473 0.444 - - 3.13e-03 1.20e-03 59.160 57
CPL 1.619 0.000 5.2 0.0 7.83e-02 0.00e+00 59.020 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: 0.000000 sec.
T50 in the 50-300 keV band: 0.000000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 501.844 -8.776 493.068
T90 418.104 40.176 458.280
T50 196.304 119.452 315.756
Peak 1.000 181.004 182.004
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
268.6174 -26.3006 0.0123 26.5 -154.8 2.3777 15.6 TRIG_00614903
------------------------------------------
Foreground time interval of the image:
-8.776 72.201 (delta_t = 80.977 [sec])
Background time interval of the image:
-75.799 -56.065 (delta_t = 19.734 [sec])
-55.000 -8.776 (delta_t = 46.224 [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 -8.776 sec. to 493.068 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 4.39820 ( )
Norm@50keV : 7.00247E-04 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 128.07 using 59 PHA bins.
# Reduced chi-squared = 2.2468 for 57 degrees of freedom
# Null hypothesis probability = 2.206742e-07
Photon flux (15-150 keV) in 501.8 sec: 0.616088 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 1.04888e-05 ( 0 0 ) ergs/cm2
Cutoff power-law model
Time interval is from -8.776 sec. to 493.068 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.00000 ( )
Epeak [keV] : 50.0000 ( )
Norm@50keV : 3.40616E-03 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 1261.09 using 59 PHA bins.
# Reduced chi-squared = 22.5195 for 56 degrees of freedom
# Null hypothesis probability = 5.393157e-227
Photon flux (15-150 keV) in 501.8 sec: 0.529849 ( -0.036584 0.036626 ) ph/cm2/s
Energy fluence (15-150 keV) : 9.03847e-06 ( -5.37177e-07 5.36725e-07 ) ergs/cm2
Band function
Time interval is from -8.776 sec. to 493.068 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.58001 ( )
beta : -8.98186 ( )
Epeak [keV] : 13.7073 ( )
Norm@50keV : 5.73515E-03 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 683.06 using 59 PHA bins.
# Reduced chi-squared = 12.419 for 55 degrees of freedom
# Null hypothesis probability = 3.364569e-109
Photon flux (15-150 keV) in 501.8 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] : 4.26488 (-0.137568 0.143579)
R^2/D10^2 : 9.51940 (-1.81541 2.24406)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 71.59 using 59 PHA bins.
# Reduced chi-squared = 1.256 for 57 degrees of freedom
# Null hypothesis probability = 9.247191e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.877e-06 4.215e-07
25- 50 2.538e-06 1.239e-07
50-150 4.489e-08 9.017e-09
15-150 8.460e-06 3.814e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 9.20815 (-0.473473 0.513267)
Norm : 23.1129 (-3.3058 3.86276)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 68.07 using 59 PHA bins.
# Reduced chi-squared = 1.194 for 57 degrees of freedom
# Null hypothesis probability = 1.496712e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 6.704e-06 4.240e-07
25- 50 2.575e-06 1.242e-07
50-150 1.400e-07 2.677e-08
15-150 9.419e-06 4.065e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 3.87517 (-0.416559 0.277865)
R1^2/D10^2 : 15.3932 (-4.69061 9.49188)
kT2 [keV] : 8.66343 (-2.87723 6.74399)
R2^2/D10^2 : 3.97583E-02 (-0.0379272 0.26328)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 59.45 using 59 PHA bins.
# Reduced chi-squared = 1.081 for 55 degrees of freedom
# Null hypothesis probability = 3.169812e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 6.298e-06 8.240e-07
25- 50 2.552e-06 6.039e-07
50-150 2.134e-07 1.152e-07
15-150 9.064e-06 1.455e-06
Peak spectrum fit
Power-law model
Time interval is from 181.004 sec. to 182.004 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 3.47304 ( -0.410964 0.476068 )
Norm@50keV : 3.12511E-03 ( -0.00112309 0.00127797 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 59.16 using 59 PHA bins.
# Reduced chi-squared = 1.038 for 57 degrees of freedom
# Null hypothesis probability = 3.967774e-01
Photon flux (15-150 keV) in 1 sec: 1.23663 ( -0.177103 0.177126 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.83737e-08 ( -8.11389e-09 8.51675e-09 ) ergs/cm2
Cutoff power-law model
Time interval is from 181.004 sec. to 182.004 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.61947 ( )
Epeak [keV] : 5.18835 ( )
Norm@50keV : 7.82754E-02 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 59.02 using 59 PHA bins.
# Reduced chi-squared = 1.054 for 56 degrees of freedom
# Null hypothesis probability = 3.655968e-01
Photon flux (15-150 keV) in 1 sec: 1.22046 ( -0.18237 0.1747 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.56375e-08 ( -9.0358e-09 1.06634e-08 ) ergs/cm2
Band function
Time interval is from 181.004 sec. to 182.004 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -3.22582 ( 0.997596 3.22582 )
beta : -3.47302 ( -0.476018 0.410753 )
Epeak [keV] : 41.4463 ( -41.4463 -41.4463 )
Norm@50keV : 0.424755 ( -0.152652 0.173686 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 59.16 using 59 PHA bins.
# Reduced chi-squared = 1.076 for 55 degrees of freedom
# Null hypothesis probability = 3.263952e-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] : 4.36490 (-0.581386 0.680261)
R^2/D10^2 : 20.0696 (-10.5077 22.7874)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 60.41 using 59 PHA bins.
# Reduced chi-squared = 1.060 for 57 degrees of freedom
# Null hypothesis probability = 3.537106e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.743e-08 7.200e-09
25- 50 1.262e-08 4.411e-09
50-150 2.540e-10 1.930e-10
15-150 4.030e-08 1.112e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 12.1201 (-2.98539 4.48673)
Norm : 29.4839 (-11.3376 21.6344)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 59.10 using 59 PHA bins.
# Reduced chi-squared = 1.037 for 57 degrees of freedom
# Null hypothesis probability = 3.988195e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.694e-08 6.040e-09
25- 50 1.473e-08 5.030e-09
50-150 1.644e-09 1.096e-09
15-150 4.332e-08 9.965e-09
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 3.97252 (-0.817595 0.73575)
R1^2/D10^2 : 30.2326 (-17.3019 58.3001)
kT2 [keV] : 16.0705 (-7.03501 71.8503)
R2^2/D10^2 : 1.86269E-02 (-0.0183929 1.41465)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 56.61 using 59 PHA bins.
# Reduced chi-squared = 1.029 for 55 degrees of freedom
# Null hypothesis probability = 4.147813e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.758e-08 1.470e-08
25- 50 1.361e-08 6.994e-09
50-150 7.699e-09 5.478e-09
15-150 4.889e-08 2.219e-08
Plot creation:
Sat Oct 11 06:29:33 EDT 2014