batgrbproduct Analysis for Trigger=727610
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 15 downlinks after the trigger.
======================================================================
BAT GRB EVENT DATA PROCESSING REPORT
Process Script Ver: batgrbproduct v2.46
Process Start Time (local time): Wed Dec 21 16:11:42 EST 2016
Host Name: bat1
Current Working Dir: /local/data/bat1/prebascript/trigger727610/batgroup_hand_proc
======================================================================
Trigger: 00727610 Segment: 000
BAT Trigger Time: 503915627.584 [s; MET]
Trigger Stop: 503915629.632 [s; MET]
UTC: 2016-12-20T08:33:30.249440 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 350.81656549025 Dec: -47.5022510820833 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 7
Image Trigger?: NO
Rate S/N Ratio: 11.0453610171873 [ if not an image trigger ]
Image S/N Ratio: 7
Flight Position: [ source = BAT ]
RA: 350.81656549025 Dec: -47.5022510820833 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 350.854655080208 Dec: -47.4833931730967 [deg; J2000]
{ 23h 23m 25.1s , -47d 29' 00.2" }
+/- 1.9869145357565 [arcmin] (estimated 90% radius based on SNR)
+/- 1.00635342121342 [arcmin] (formal 1-sigma fit error)
SNR: 11.4063872756498
Angular difference between Flight and Ground position is 1.914354 arcmin
Partial Coding Fraction: 1 [ including projection effects ]
Duration
T90: 7.21199995279312 +/- 1.79303542277359
Measured from: -3.05199998617172
to: 4.1599999666214 [s; relative to TRIGTIME]
T50: 3.4439999461174 +/- 0.862517261533636
Measured from: -0.607999980449677
to: 2.83599996566772 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 2.4200000166893
to: 3.4200000166893 [s; relative to TRIGTIME]
Total Fluence
Measured from: -3.42799997329712
to: 4.46399998664856 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.153393 0.131376 0.072892 0.007379
0.017384 0.017163 0.014609 0.013098 [error]
Peak 0.037745 0.015143 0.016761 0.002253
0.006393 0.006204 0.005208 0.004700 [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 4.33e-08 5.46e-08 5.02e-08 8.06e-08 1.76e-07 2.29e-07 erg/cm2
Error 7.61e-09 7.66e-09 1.31e-08 4.05e-08 3.00e-08 5.66e-08 erg/cm2
Peak flux Power-law 2.93e-01 1.84e-01 7.40e-02 4.03e-02 5.71e-01 5.91e-01 ph/cm2/s
Error 9.04e-02 5.09e-02 4.07e-02 4.19e-02 1.40e-01 1.50e-01 ph/cm2/s
Fluence Cutoff-PL 4.19e-08 5.84e-08 4.84e-08 3.13e-08 1.67e-07 1.80e-07 erg/cm2
Error 8.24e-09 1.01e-08 1.48e-08 4.43e-08 3.24e-08 6.94e-08 erg/cm2
Peak flux Cutoff-PL 2.97e-01 1.82e-01 7.17e-02 3.74e-02 5.70e-01 5.89e-01 ph/cm2/s
Error 9.08e-02 5.41e-02 -------- 4.75e-02 1.40e-01 1.49e-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 2.122 0.266 - - 2.39e-03 4.54e-04 52.880 57
CPL 1.590 0.878 30.9 0.0 4.96e-03 0.00e+00 51.900 56
The chi2 of BB fit is Chi-Squared Chi-Squared 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 2.311 0.575 - - 3.25e-03 1.36e-03 40.580 57
CPL 1.916 0.000 9.9 0.0 5.35e-03 0.00e+00 41.000 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 7.892 -3.428 4.464
T90 7.212 -3.052 4.160
T50 3.444 -0.608 2.836
Peak 1.000 2.420 3.420
Image
Pre-slew 15.0-350.0 keV image (Event data)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
350.8547 -47.4834 0.0167 3.3432 -179.8420 0.3525252 11.406 TRIG_00727610
Foreground time interval of the image:
-3.428 4.464 (delta_t = 7.892 [sec])
Background time interval of the image:
-576.183 -559.744 (delta_t = 16.439 [sec])
-239.584 -3.428 (delta_t = 236.156 [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 -3.428 sec. to 4.464 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.12238 ( -0.254046 0.278404 )
Norm@50keV : 2.39009E-03 ( -0.00046091 0.000447843 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 52.88 using 59 PHA bins.
# Reduced chi-squared = 0.9276 for 57 degrees of freedom
# Null hypothesis probability = 6.304838e-01
Photon flux (15-150 keV) in 7.892 sec: 0.380231 ( -0.0506217 0.0506239 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.75653e-07 ( -2.94733e-08 3.05749e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -3.428 sec. to 4.464 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.58971 ( -1.10121 0.655648 )
Epeak [keV] : 30.9349 ( )
Norm@50keV : 4.95863E-03 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 51.90 using 59 PHA bins.
# Reduced chi-squared = 0.9268 for 56 degrees of freedom
# Null hypothesis probability = 6.306265e-01
Photon flux (15-150 keV) in 7.892 sec: 0.374098 ( -0.051286 0.051488 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.66786e-07 ( -3.09777e-08 3.38156e-08 ) ergs/cm2
Band function
Time interval is from -3.428 sec. to 4.464 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.59478 ( -1.49024 1.14554 )
beta : -10.0000 ( 10 0 )
Epeak [keV] : 30.8795 ( -24.5047 -30.8795 )
Norm@50keV : 4.92096E-03 ( -0.00260833 0.017601 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 51.90 using 59 PHA bins.
# Reduced chi-squared = 0.9437 for 55 degrees of freedom
# Null hypothesis probability = 5.936904e-01
Photon flux (15-150 keV) in 7.892 sec: 0.377238 ( ) 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] : 9.01128 (-1.63189 1.94744)
R^2/D10^2 : 0.258093 (-0.256713 0.302186)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 66.53 using 59 PHA bins.
# Reduced chi-squared = 1.167 for 57 degrees of freedom
# Null hypothesis probability = 1.816960e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.222e-08 8.437e-09
25- 50 6.863e-08 1.376e-08
50-150 2.628e-08 1.109e-08
15-150 1.271e-07 2.825e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 54.4894 (-17.7554 30.4006)
Norm : 2.08882 (-0.277937 0.277306)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 52.12 using 59 PHA bins.
# Reduced chi-squared = 0.9144 for 57 degrees of freedom
# Null hypothesis probability = 6.582053e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.072e-08 8.322e-09
25- 50 6.009e-08 2.128e-08
50-150 6.294e-08 4.920e-08
15-150 1.637e-07 7.885e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 4.55042 (-1.35731 1.57285)
R1^2/D10^2 : 2.69226 (-1.86958 10.5585)
kT2 [keV] : 16.1108 (-3.98791 6.58656)
R2^2/D10^2 : 2.06388E-02 (-0.0155368 0.0304536)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 49.90 using 59 PHA bins.
# Reduced chi-squared = 0.9072 for 55 degrees of freedom
# Null hypothesis probability = 6.694911e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.363e-08 2.327e-08
25- 50 5.488e-08 2.838e-08
50-150 6.765e-08 4.100e-08
15-150 1.662e-07 8.598e-08
Peak spectrum fit
Power-law model
Time interval is from 2.420 sec. to 3.420 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.31102 ( -0.506907 0.64302 )
Norm@50keV : 3.24843E-03 ( -0.00138916 0.00132424 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 40.58 using 59 PHA bins.
# Reduced chi-squared = 0.7119 for 57 degrees of freedom
# Null hypothesis probability = 9.507979e-01
Photon flux (15-150 keV) in 1 sec: 0.571190 ( -0.140057 0.140219 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.11063e-08 ( -1.01353e-08 1.09905e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 2.420 sec. to 3.420 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.91551 ( )
Epeak [keV] : 9.93855 ( )
Norm@50keV : 5.35414E-03 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 41.00 using 59 PHA bins.
# Reduced chi-squared = 0.7321 for 56 degrees of freedom
# Null hypothesis probability = 9.336778e-01
Photon flux (15-150 keV) in 1 sec: 0.570477 ( -0.139318 0.140946 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.10808e-08 ( -1.04694e-08 1.08114e-08 ) ergs/cm2
Band function
Time interval is from 2.420 sec. to 3.420 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -2.49060 ( 2.4906 2.4906 )
beta : -2.31102 ( -0.642728 0.506843 )
Epeak [keV] : 9.15792 ( -9.15792 -9.15792 )
Norm@50keV : 0.441504 ( -0.188917 0.180007 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 40.58 using 59 PHA bins.
# Reduced chi-squared = 0.7378 for 55 degrees of freedom
# Null hypothesis probability = 9.268218e-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] : 5.65012 (-1.6054 3.00059)
R^2/D10^2 : 2.47436 (-2.46274 8.69085)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 47.04 using 59 PHA bins.
# Reduced chi-squared = 0.8253 for 57 degrees of freedom
# Null hypothesis probability = 8.238370e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 9.578e-09 5.630e-09
25- 50 8.356e-09 5.415e-09
50-150 5.942e-10 5.445e-10
15-150 1.853e-08 1.116e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 41.7053 (-23.5861 69.9247)
Norm : 3.57306 (-1.41034 3.6706)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 42.08 using 59 PHA bins.
# Reduced chi-squared = 0.7383 for 57 degrees of freedom
# Null hypothesis probability = 9.302835e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 8.317e-09 2.905e-09
25- 50 1.114e-08 5.125e-09
50-150 9.014e-09 6.587e-09
15-150 2.847e-08 1.331e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 4.09962 (-1.33694 1.76738)
R1^2/D10^2 : 8.50658 (-6.78976 13.5497)
kT2 [keV] : 19.7686 (-8.1454 25.1784)
R2^2/D10^2 : 1.35619E-02 (-0.0126995 0.0681716)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 38.63 using 59 PHA bins.
# Reduced chi-squared = 0.7024 for 55 degrees of freedom
# Null hypothesis probability = 9.539166e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 9.731e-09 5.605e-09
25- 50 8.443e-09 4.667e-09
50-150 1.472e-08 1.010e-08
15-150 3.289e-08 1.878e-08
Plot creation:
Wed Dec 21 16:54:12 EST 2016