batgrbproduct analysis for trigger=881709
batgrbproduct Analysis for Trigger=881709
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): Fri Jan 4 20:20:22 EST 2019
Host Name: bat1
Current Working Dir: /local/data/bat1/prebascript/trigger881709/GCN5_download_cron
======================================================================
Trigger: 00881709 Segment: 000
BAT Trigger Time: 568242253.376 [s; MET]
Trigger Stop: 568242254.4 [s; MET]
UTC: 2019-01-03T21:03:51.185580 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 212.574478514615 Dec: 35.2610232533427 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 9.37
Image Trigger?: NO
Rate S/N Ratio: 63.2692658405327 [ if not an image trigger ]
Image S/N Ratio: 9.37
Flight Position: [ source = BAT ]
RA: 212.574478514615 Dec: 35.2610232533427 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 212.560957706864 Dec: 35.253729709548 [deg; J2000]
{ 14h 10m 14.6s , +35d 15' 13.4" }
+/- 1.31830973654371 [arcmin] (estimated 90% radius based on SNR)
+/- 0.696754334387952 [arcmin] (formal 1-sigma fit error)
SNR: 20.4957996083085
Angular difference between Flight and Ground position is 0.793933 arcmin
Partial Coding Fraction: 0.0625 [ including projection effects ]
Duration
T90: 19.5199999809265 +/- 2.71679818444433
Measured from: -4.87999987602234
to: 14.6400001049042 [s; relative to TRIGTIME]
T50: 9.31200003623962 +/- 0.486621028293069
Measured from: 0.528000116348267
to: 9.84000015258789 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 0.595999956130981
to: 1.59599995613098 [s; relative to TRIGTIME]
Total Fluence
Measured from: -10.432000041008
to: 16.1759999990463 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 4.337905 6.751263 5.436695 1.209375
0.204454 0.217138 0.193125 0.141420 [error]
Peak 0.377613 0.673700 0.644748 0.202068
0.047459 0.056824 0.058306 0.039861 [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 1.90e-06 3.23e-06 4.18e-06 1.09e-05 1.23e-05 2.02e-05 erg/cm2
Error 1.30e-07 1.33e-07 1.93e-07 1.09e-06 4.79e-07 1.22e-06 erg/cm2
Peak flux Power-law 5.04e+00 5.35e+00 4.02e+00 4.91e+00 1.63e+01 1.93e+01 ph/cm2/s
Error 7.80e-01 5.36e-01 4.40e-01 1.05e+00 1.54e+00 1.81e+00 ph/cm2/s
Fluence Cutoff-PL 1.66e-06 3.39e-06 4.42e-06 5.21e-06 1.19e-05 1.47e-05 erg/cm2
Error 1.62e-07 1.54e-07 2.26e-07 1.57e-06 5.14e-07 1.62e-06 erg/cm2
Peak flux Cutoff-PL 4.26e+00 5.77e+00 4.46e+00 2.42e+00 1.60e+01 1.69e+01 ph/cm2/s
Error 9.30e-01 6.42e-01 5.60e-01 1.31e+00 1.55e+00 1.99e+00 ph/cm2/s
Fluence Band -------- 3.35e-06 4.36e-06 5.65e-06 1.18e-05 1.51e-05 erg/cm2
Error -------- -------- -------- -------- -------- -------- erg/cm2
Peak flux Band 3.99e+00 6.11e+00 4.16e+00 3.69e+00 1.58e+01 1.79e+01 ph/cm2/s
Error 1.07e+00 -------- 6.67e-01 -------- 1.57e+00 -------- ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.630 0.065 - - 4.96e-02 1.86e-03 74.910 57
CPL 0.993 0.287 85.0 18.6 9.91e-02 3.09e-02 58.410 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.411 0.143 - - 1.33e-01 1.24e-02 71.270 57
CPL 0.581 0.646 91.9 58.4 3.36e-01 2.69e-01 65.420 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: 13.952000 sec.
T50 in the 50-300 keV band: 8.896000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 26.608 -10.432 16.176
T90 19.520 -4.880 14.640
T50 9.312 0.528 9.840
Peak 1.000 0.596 1.596
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
212.5610 +35.2537 0.0094 48.6 143.8 18.9434 20.5 TRIG_00881709
------------------------------------------
Foreground time interval of the image:
-10.432 15.825 (delta_t = 26.257 [sec])
Background time interval of the image:
-239.376 -10.432 (delta_t = 228.944 [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 -10.432 sec. to 16.176 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.62961 ( -0.0647498 0.0650154 )
Norm@50keV : 4.96356E-02 ( -0.00186145 0.00186071 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 74.91 using 59 PHA bins.
# Reduced chi-squared = 1.314 for 57 degrees of freedom
# Null hypothesis probability = 5.603323e-02
Photon flux (15-150 keV) in 26.61 sec: 6.43828 ( -0.263151 0.263986 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.23102e-05 ( -4.78328e-07 4.78863e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -10.432 sec. to 16.176 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.992671 ( -0.296023 0.277874 )
Epeak [keV] : 84.9988 ( -11.8841 25.2608 )
Norm@50keV : 9.90914E-02 ( -0.0252506 0.0364893 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 58.41 using 59 PHA bins.
# Reduced chi-squared = 1.043 for 56 degrees of freedom
# Null hypothesis probability = 3.868307e-01
Photon flux (15-150 keV) in 26.61 sec: 6.19571 ( -0.27957 0.28126 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.19198e-05 ( -5.15223e-07 5.12961e-07 ) ergs/cm2
Band function
Time interval is from -10.432 sec. to 16.176 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.992963 ( -0.258757 0.197376 )
beta : -7.29575 ( 7.11373 17.1137 )
Epeak [keV] : 84.9678 ( -9.08915 25.1879 )
Norm@50keV : 9.90764E-02 ( -0.0248888 0.00922806 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 58.41 using 59 PHA bins.
# Reduced chi-squared = 1.062 for 55 degrees of freedom
# Null hypothesis probability = 3.511676e-01
Photon flux (15-150 keV) in 26.61 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 1.17766e-05 ( 0 0 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 15.4670 ( )
R^2/D10^2 : 0.634032 ( )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 178.17 using 59 PHA bins.
# Reduced chi-squared = 3.1258 for 57 degrees of freedom
# Null hypothesis probability = 2.131871e-14
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 8.404e-07 6.187e-08
25- 50 3.433e-06 1.623e-07
50-150 5.664e-06 3.832e-07
15-150 9.938e-06 4.191e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 169.898 (-27.5825 -169.9)
Norm : 26.3095 (-1.1625 1.2443)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 61.09 using 59 PHA bins.
# Reduced chi-squared = 1.072 for 57 degrees of freedom
# Null hypothesis probability = 3.312638e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.777e-06 1.156e-07
25- 50 3.351e-06 2.581e-07
50-150 6.947e-06 1.857e-06
15-150 1.207e-05 2.146e-06
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 7.49363 (-1.12952 1.2323)
R1^2/D10^2 : 4.95867 (-1.88076 3.62859)
kT2 [keV] : 24.2214 (-2.79724 4.0722)
R2^2/D10^2 : 9.58034E-02 (-0.0444777 0.0626522)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 60.85 using 59 PHA bins.
# Reduced chi-squared = 1.106 for 55 degrees of freedom
# Null hypothesis probability = 2.734159e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.535e-06 2.501e-07
25- 50 3.453e-06 3.619e-07
50-150 6.855e-06 8.608e-07
15-150 1.184e-05 1.307e-06
Peak spectrum fit
Power-law model
Time interval is from 0.596 sec. to 1.596 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.41126 ( -0.142395 0.144582 )
Norm@50keV : 0.133471 ( -0.0123797 0.0123623 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 71.27 using 59 PHA bins.
# Reduced chi-squared = 1.250 for 57 degrees of freedom
# Null hypothesis probability = 9.671128e-02
Photon flux (15-150 keV) in 1 sec: 16.2963 ( -1.53443 1.53623 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.28675e-06 ( -1.29061e-07 1.29514e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.596 sec. to 1.596 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.581388 ( -0.693831 0.598987 )
Epeak [keV] : 91.9309 ( -21.5079 95.2185 )
Norm@50keV : 0.335950 ( -0.160569 0.377882 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 65.42 using 59 PHA bins.
# Reduced chi-squared = 1.168 for 56 degrees of freedom
# Null hypothesis probability = 1.823127e-01
Photon flux (15-150 keV) in 1 sec: 16.0020 ( -1.5486 1.5503 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.25897e-06 ( 0 0 ) ergs/cm2
Band function
Time interval is from 0.596 sec. to 1.596 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 2.07158E-02 ( -1.17618 -0.0380635 )
beta : -1.80346 ( 1.80058 0.345915 )
Epeak [keV] : 62.2990 ( -32.0645 100.156 )
Norm@50keV : 0.794176 ( -0.86716 1439.19 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 65.06 using 59 PHA bins.
# Reduced chi-squared = 1.183 for 55 degrees of freedom
# Null hypothesis probability = 1.662261e-01
Photon flux (15-150 keV) in 1 sec: 15.8416 ( -8.8416 -1.5632 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.25403e-06 ( 0 0 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 16.4841 (-1.75801 1.96552)
R^2/D10^2 : 1.44537 (-0.464567 0.678517)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 83.04 using 59 PHA bins.
# Reduced chi-squared = 1.457 for 57 degrees of freedom
# Null hypothesis probability = 1.379109e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 8.064e-08 1.451e-08
25- 50 3.479e-07 4.665e-08
50-150 6.681e-07 1.087e-07
15-150 1.097e-06 1.344e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 200.000 (-37.6335 -200)
Norm : 67.9598 (-6.24056 6.24056)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 70.97 using 59 PHA bins.
# Reduced chi-squared = 1.245 for 57 degrees of freedom
# Null hypothesis probability = 1.010643e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.692e-07 2.170e-08
25- 50 3.255e-07 6.750e-08
50-150 7.139e-07 2.549e-07
15-150 1.209e-06 3.829e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 8.70046 (-2.69502 3.17194)
R1^2/D10^2 : 7.31024 (-4.13155 10.6476)
kT2 [keV] : 27.4726 (-6.73821 19.6596)
R2^2/D10^2 : 0.177916 (-0.15228 0.248643)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 64.39 using 59 PHA bins.
# Reduced chi-squared = 1.171 for 55 degrees of freedom
# Null hypothesis probability = 1.810763e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.279e-07 5.865e-08
25- 50 3.445e-07 1.448e-07
50-150 7.947e-07 4.046e-07
15-150 1.267e-06 5.343e-07
Plot creation:
Fri Jan 4 20:24:54 EST 2019