batgrbproduct analysis for trigger=737438
batgrbproduct Analysis for Trigger=737438
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): Thu Feb 9 18:54:41 EST 2017
Host Name: bat1
Current Working Dir: /local/data/bat1/prebascript/trigger737438/GCN5_download_cron
======================================================================
Trigger: 00737438 Segment: 000
BAT Trigger Time: 508270294.912 [s; MET]
Trigger Stop: 508270295.424 [s; MET]
UTC: 2017-02-08T18:11:16.327540 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 166.562700100311 Dec: -46.779089937229 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 10.1
Image Trigger?: NO
Rate S/N Ratio: 30 [ if not an image trigger ]
Image S/N Ratio: 10.1
Flight Position: [ source = BAT ]
RA: 166.562700100311 Dec: -46.779089937229 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 166.543993923524 Dec: -46.7857173882458 [deg; J2000]
{ 11h 06m 10.6s , -46d 47' 08.6" }
+/- 1.38795000283972 [arcmin] (estimated 90% radius based on SNR)
+/- 0.597981083271537 [arcmin] (formal 1-sigma fit error)
SNR: 19.0426421206809
Angular difference between Flight and Ground position is 0.865343 arcmin
Partial Coding Fraction: 0.1796875 [ including projection effects ]
Duration
T90: 7.44799995422363 +/- 0.543293661245789
Measured from: 0.0880001187324524
to: 7.53600007295609 [s; relative to TRIGTIME]
T50: 4.97599995136261 +/- 1.08424345603377
Measured from: 0.628000140190125
to: 5.60400009155273 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: -0.0360000133514404
to: 0.96399998664856 [s; relative to TRIGTIME]
Total Fluence
Measured from: -0.0360000133514404
to: 8.06000000238419 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.248685 0.604223 0.732012 0.289649
0.047051 0.051845 0.047477 0.038076 [error]
Peak 0.082178 0.180143 0.274105 0.096272
0.017909 0.021793 0.022093 0.016868 [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 1.19e-07 2.92e-07 5.69e-07 2.74e-06 1.54e-06 3.72e-06 erg/cm2
Error 2.10e-08 3.13e-08 4.37e-08 4.77e-07 1.17e-07 4.86e-07 erg/cm2
Peak flux Power-law 1.22e+00 1.64e+00 1.61e+00 2.84e+00 5.40e+00 7.31e+00 ph/cm2/s
Error 2.69e-01 2.26e-01 1.68e-01 6.08e-01 6.02e-01 7.66e-01 ph/cm2/s
Fluence Cutoff-PL 1.07e-07 2.96e-07 5.97e-07 1.86e-06 1.53e-06 2.86e-06 erg/cm2
Error 2.66e-08 3.33e-08 5.96e-08 8.97e-07 1.18e-07 9.48e-07 erg/cm2
Peak flux Cutoff-PL 9.11e-01 1.66e+00 1.82e+00 1.55e+00 5.22e+00 5.94e+00 ph/cm2/s
Error 3.47e-01 2.52e-01 2.47e-01 8.35e-01 6.17e-01 1.06e+00 ph/cm2/s
Fluence Band -------- -------- -------- -------- -------- -------- erg/cm2
Error -------- -------- -------- -------- -------- -------- erg/cm2
Peak flux Band 9.30e-01 1.66e+00 1.81e+00 1.59e+00 5.25e+00 5.99e+00 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 1.036 0.134 - - 1.78e-02 1.48e-03 87.980 57
CPL 0.678 0.504 231.4 -62.4 2.49e-02 1.29e-02 86.680 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.023 0.170 - - 4.68e-02 5.05e-03 71.190 57
CPL 0.123 0.861 132.1 196.6 1.08e-01 9.63e-02 67.190 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: 7.616000 sec.
T50 in the 50-300 keV band: 5.248000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 8.096 -0.036 8.060
T90 7.448 0.088 7.536
T50 4.976 0.628 5.604
Peak 1.000 -0.036 0.964
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
166.5440 -46.7857 0.0101 53.2 -20.1 1.9980 19.0 TRIG_00737438
------------------------------------------
Foreground time interval of the image:
-0.036 8.060 (delta_t = 8.096 [sec])
Background time interval of the image:
-239.912 -56.905 (delta_t = 183.007 [sec])
-55.912 -0.036 (delta_t = 55.876 [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 -0.036 sec. to 8.060 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.03594 ( -0.136209 0.131039 )
Norm@50keV : 1.77901E-02 ( -0.0014915 0.0014726 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 87.98 using 59 PHA bins.
# Reduced chi-squared = 1.544 for 57 degrees of freedom
# Null hypothesis probability = 5.264961e-03
Photon flux (15-150 keV) in 8.096 sec: 2.05261 ( -0.178975 0.180339 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.5381e-06 ( -1.16685e-07 1.16667e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.036 sec. to 8.060 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.678257 ( -0.595144 0.413648 )
Epeak [keV] : 231.405 ( -106.536 -231.412 )
Norm@50keV : 2.49324E-02 ( -0.00808401 0.0177503 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 86.68 using 59 PHA bins.
# Reduced chi-squared = 1.548 for 56 degrees of freedom
# Null hypothesis probability = 5.335365e-03
Photon flux (15-150 keV) in 8.096 sec: 2.02249 ( -0.18301 0.1851 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.53113e-06 ( -1.18461e-07 1.1804e-07 ) ergs/cm2
Band function
Time interval is from -0.036 sec. to 8.060 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 0.960039 ( -1.52171 -0.55111 )
beta : -1.25449 ( -0.292084 0.230369 )
Epeak [keV] : 64.7273 ( -25.0348 129.893 )
Norm@50keV : 0.197535 ( -0.210755 26.3815 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 83.71 using 59 PHA bins.
# Reduced chi-squared = 1.522 for 55 degrees of freedom
# Null hypothesis probability = 7.553769e-03
Photon flux (15-150 keV) in 8.096 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] : 23.7428 (-2.31748 2.74236)
R^2/D10^2 : 5.76898E-02 (-0.0174491 0.0235698)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 111.11 using 59 PHA bins.
# Reduced chi-squared = 1.9493 for 57 degrees of freedom
# Null hypothesis probability = 2.383617e-05
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.697e-08 7.869e-09
25- 50 2.594e-07 3.704e-08
50-150 1.090e-06 1.093e-07
15-150 1.397e-06 1.206e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 199.363 ( )
Norm : 9.17416 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 135.42 using 59 PHA bins.
# Reduced chi-squared = 2.3758 for 57 degrees of freedom
# Null hypothesis probability = 2.496672e-08
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.849e-07 1.708e-08
25- 50 3.558e-07 3.704e-08
50-150 7.803e-07 2.039e-07
15-150 1.321e-06 2.902e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 12.8003 (-2.93093 3.20172)
R1^2/D10^2 : 0.279813 (-0.129644 0.278653)
kT2 [keV] : 59.5611 (-25.6908 -59.5611)
R2^2/D10^2 : 2.86657E-03 (-0.00206702 0.00923812)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 82.34 using 59 PHA bins.
# Reduced chi-squared = 1.497 for 55 degrees of freedom
# Null hypothesis probability = 9.909615e-03
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 8.655e-08 2.978e-08
25- 50 3.252e-07 1.248e-07
50-150 1.110e-06 5.464e-07
15-150 1.522e-06 6.513e-07
Peak spectrum fit
Power-law model
Time interval is from -0.036 sec. to 0.964 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.02343 ( -0.172417 0.167263 )
Norm@50keV : 4.68184E-02 ( -0.00507057 0.00502291 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 71.19 using 59 PHA bins.
# Reduced chi-squared = 1.249 for 57 degrees of freedom
# Null hypothesis probability = 9.787108e-02
Photon flux (15-150 keV) in 1 sec: 5.39679 ( -0.59985 0.604698 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.02121e-07 ( -5.24828e-08 5.25281e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.036 sec. to 0.964 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.122548 ( -0.947421 0.774352 )
Epeak [keV] : 132.139 ( -37.5541 355.638 )
Norm@50keV : 0.107891 ( -0.0545276 0.138035 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 67.19 using 59 PHA bins.
# Reduced chi-squared = 1.200 for 56 degrees of freedom
# Null hypothesis probability = 1.454995e-01
Photon flux (15-150 keV) in 1 sec: 5.22450 ( -0.61434 0.6197 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.98772e-07 ( -5.413e-08 5.3753e-08 ) ergs/cm2
Band function
Time interval is from -0.036 sec. to 0.964 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.130765 ( 0.857077 0.857077 )
beta : 10.0000 ( -10 -10 )
Epeak [keV] : 132.956 ( -132.956 -132.956 )
Norm@50keV : 8.94021E-21 ( -1.43768e-21 0 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 66.46 using 59 PHA bins.
# Reduced chi-squared = 1.208 for 55 degrees of freedom
# Null hypothesis probability = 1.384352e-01
Photon flux (15-150 keV) in 1 sec: 5.24520 ( ) 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] : 23.5064 (-2.67588 3.22001)
R^2/D10^2 : 0.163496 (-0.0557613 0.0790515)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 73.30 using 59 PHA bins.
# Reduced chi-squared = 1.286 for 57 degrees of freedom
# Null hypothesis probability = 7.175208e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.620e-08 3.565e-09
25- 50 8.895e-08 1.470e-08
50-150 3.668e-07 5.720e-08
15-150 4.719e-07 6.075e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 200.000 (-17.9219 -200)
Norm : 23.1021 (-2.49048 2.49048)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 98.74 using 59 PHA bins.
# Reduced chi-squared = 1.732 for 57 degrees of freedom
# Null hypothesis probability = 5.055642e-04
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.755e-08 3.201e-08
25- 50 1.107e-07 6.060e-08
50-150 2.428e-07 1.317e-07
15-150 4.111e-07 1.873e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 2.07237 (-2.0729 11.9489)
R1^2/D10^2 : 1429.42 (-1418.37 -1421.92)
kT2 [keV] : 24.5321 (-2.95256 8.59149)
R2^2/D10^2 : 0.140054 (-0.137383 0.0734084)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 67.21 using 59 PHA bins.
# Reduced chi-squared = 1.222 for 55 degrees of freedom
# Null hypothesis probability = 1.250574e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.266e-08 1.213e-08
25- 50 8.366e-08 1.646e-08
50-150 3.717e-07 6.435e-08
15-150 4.880e-07 7.175e-08
Plot creation:
Thu Feb 9 19:10:08 EST 2017