batgrbproduct analysis for trigger=886496
batgrbproduct Analysis for Trigger=886496
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 Jan 30 06:46:37 EST 2019
Host Name: bat1
Current Working Dir: /local/data/bat1/prebascript/trigger886496/GCN5_download_cron
======================================================================
Trigger: 00886496 Segment: 000
BAT Trigger Time: 570450128 [s; MET]
Trigger Stop: 570450248 [s; MET]
UTC: 2019-01-29T10:21:45.671060 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 207.026138931233 Dec: -63.2676695275734 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 28.73
Image Trigger?: YES
Rate S/N Ratio: 0 [ if not an image trigger ]
Image S/N Ratio: 28.73
Flight Position: [ source = BAT ]
RA: 207.026138931233 Dec: -63.2676695275734 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 207.039493983328 Dec: -63.2705764446277 [deg; J2000]
{ 13h 48m 09.5s , -63d 16' 14.1" }
+/- 0.718841574662604 [arcmin] (estimated 90% radius based on SNR)
+/- 0.211790923312156 [arcmin] (formal 1-sigma fit error)
SNR: 48.7447798217799
Angular difference between Flight and Ground position is 0.400410 arcmin
Partial Coding Fraction: 0.578125 [ including projection effects ]
Duration
T90: 405.927999973297 +/- 5.91882866800655
Measured from: -59.8159998655319
to: 346.112000107765 [s; relative to TRIGTIME]
T50: 221.963999867439 +/- 6.82469039323739
Measured from: 15.7760001420975
to: 237.740000009537 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: -22.2560000419617
to: -21.2560000419617 [s; relative to TRIGTIME]
Total Fluence
Measured from: -86.0319999456406
to: 375.65600001812 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 24.165120 26.879691 13.882116 1.789772
0.217346 0.213979 0.178632 0.154379 [error]
Peak 0.086999 0.094467 0.037288 0.015420
0.011495 0.010980 0.008788 0.007374 [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 9.13e-06 1.17e-05 1.09e-05 1.78e-05 3.77e-05 4.95e-05 erg/cm2
Error 3.10e-07 2.24e-07 2.29e-07 8.55e-07 6.25e-07 9.91e-07 erg/cm2
Peak flux Power-law 8.92e-01 6.60e-01 3.24e-01 2.27e-01 1.98e+00 2.10e+00 ph/cm2/s
Error 1.76e-01 9.07e-02 7.11e-02 9.40e-02 2.75e-01 2.90e-01 ph/cm2/s
Fluence Cutoff-PL 7.91e-06 1.19e-05 1.12e-05 9.39e-06 3.59e-05 4.04e-05 erg/cm2
Error 4.11e-07 2.42e-07 2.53e-07 1.41e-06 7.53e-07 1.67e-06 erg/cm2
Peak flux Cutoff-PL 8.18e-01 7.42e-01 3.12e-01 6.23e-02 1.92e+00 1.93e+00 ph/cm2/s
Error 2.05e-01 1.38e-01 8.88e-02 1.41e-01 2.87e-01 3.14e-01 ph/cm2/s
Fluence Band 7.82e-06 1.19e-05 1.12e-05 1.02e-05 3.59e-05 4.13e-05 erg/cm2
Error -------- 2.37e-07 -------- -------- -------- -------- 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 2.100 0.033 - - 8.85e-03 1.47e-04 86.780 57
CPL 1.525 0.151 43.5 4.2 1.64e-02 2.61e-03 39.600 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 2.024 0.248 - - 1.31e-02 2.20e-03 51.840 57
CPL 0.995 1.437 39.5 0.0 5.28e-02 0.00e+00 49.980 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 461.688 -86.032 375.656
T90 405.928 -59.816 346.112
T50 221.964 15.776 237.740
Peak 1.000 -22.256 -21.256
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
207.0395 -63.2706 0.0039 27.0 47.2 20.9578 48.7 TRIG_00886496
------------------------------------------
Foreground time interval of the image:
-16.399 34.740 (delta_t = 51.139 [sec])
36.000 129.801 (delta_t = 93.801 [sec])
Background time interval of the image:
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
Multiple GTIs in the spectrum
tstart tstop
-86.032000 -70.930000
-70.000000 -55.095800
-54.000000 34.740000
36.000000 375.656000
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.10045 ( -0.0330747 0.0331247 )
Norm@50keV : 8.84599E-03 ( -0.000146986 0.00014696 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 86.78 using 59 PHA bins.
# Reduced chi-squared = 1.522 for 57 degrees of freedom
# Null hypothesis probability = 6.697781e-03
Photon flux (15-150 keV) in 458.4 sec: 1.39201 ( -0.0305709 0.0307714 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.76769e-05 ( -6.24836e-07 6.24923e-07 ) ergs/cm2
Cutoff power-law model
Multiple GTIs in the spectrum
tstart tstop
-86.032000 -70.930000
-70.000000 -55.095800
-54.000000 34.740000
36.000000 375.656000
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.52499 ( -0.15389 0.149002 )
Epeak [keV] : 43.5485 ( -4.75967 3.65537 )
Norm@50keV : 1.63693E-02 ( -0.00236178 0.00286334 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 39.60 using 59 PHA bins.
# Reduced chi-squared = 0.7072 for 56 degrees of freedom
# Null hypothesis probability = 9.524016e-01
Photon flux (15-150 keV) in 458.4 sec: 1.30349 ( -0.03621 0.03661 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.59299e-05 ( -7.52234e-07 7.5338e-07 ) ergs/cm2
Band function
Multiple GTIs in the spectrum
tstart tstop
-86.032000 -70.930000
-70.000000 -55.095800
-54.000000 34.740000
36.000000 375.656000
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.52498 ( -0.116466 0.129379 )
beta : -10.0000 ( 10 8.34888e-14 )
Epeak [keV] : 43.5410 ( -4.75364 3.65395 )
Norm@50keV : 1.63664E-02 ( -0.00235887 0.00286418 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 39.60 using 59 PHA bins.
# Reduced chi-squared = 0.7200 for 55 degrees of freedom
# Null hypothesis probability = 9.415527e-01
Photon flux (15-150 keV) in 458.4 sec: 1.30629 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 3.58874e-05 ( 0 0 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 13.1204 ( )
R^2/D10^2 : 0.199764 ( )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 666.71 using 59 PHA bins.
# Reduced chi-squared = 11.697 for 57 degrees of freedom
# Null hypothesis probability = 7.666750e-105
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.343e-06 1.141e-07
25- 50 1.163e-05 2.544e-07
50-150 1.272e-05 3.553e-07
15-150 2.769e-05 4.722e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 73.2484 (-3.52033 3.81386)
Norm : 6.28913 (-0.20896 0.216483)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 44.20 using 59 PHA bins.
# Reduced chi-squared = 0.7755 for 57 degrees of freedom
# Null hypothesis probability = 8.922679e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 7.430e-06 2.109e-07
25- 50 1.196e-05 2.338e-07
50-150 1.588e-05 4.332e-07
15-150 3.528e-05 5.822e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 6.85412 (-0.436766 0.452049)
R1^2/D10^2 : 1.72936 (-0.362935 0.494905)
kT2 [keV] : 20.9938 (-1.21093 1.42679)
R2^2/D10^2 : 2.27665E-02 (-0.00568859 0.00686468)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 52.87 using 59 PHA bins.
# Reduced chi-squared = 0.9612 for 55 degrees of freedom
# Null hypothesis probability = 5.565187e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 6.720e-06 4.263e-07
25- 50 1.216e-05 3.988e-07
50-150 1.585e-05 5.845e-07
15-150 3.473e-05 1.077e-06
Peak spectrum fit
Power-law model
Time interval is from -22.256 sec. to -21.256 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.02397 ( -0.240325 0.255415 )
Norm@50keV : 1.30715E-02 ( -0.00222685 0.00216879 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 51.84 using 59 PHA bins.
# Reduced chi-squared = 0.9094 for 57 degrees of freedom
# Null hypothesis probability = 6.686490e-01
Photon flux (15-150 keV) in 1 sec: 1.98265 ( -0.274858 0.275042 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.20711e-07 ( -1.90557e-08 1.94212e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -22.256 sec. to -21.256 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.994518 ( -1.72718 1.14696 )
Epeak [keV] : 39.5460 ( )
Norm@50keV : 5.28149E-02 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 49.98 using 59 PHA bins.
# Reduced chi-squared = 0.8925 for 56 degrees of freedom
# Null hypothesis probability = 7.008049e-01
Photon flux (15-150 keV) in 1 sec: 1.92173 ( -0.28721 0.28632 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.0987e-07 ( -2.05528e-08 2.339e-08 ) ergs/cm2
Band function
Time interval is from -22.256 sec. to -21.256 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.717964 ( 0.63508 0.63508 )
beta : -2.59473 ( 2.68819 0.743993 )
Epeak [keV] : 37.4997 ( -37.297 16.7576 )
Norm@50keV : 8.04277E-02 ( -0.0942482 1978.86 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 49.25 using 59 PHA bins.
# Reduced chi-squared = 0.8954 for 55 degrees of freedom
# Null hypothesis probability = 6.931210e-01
Photon flux (15-150 keV) in 1 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 1.13054e-07 ( 0 0 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 9.96925 (-1.30867 1.51525)
R^2/D10^2 : 0.961409 (-0.412964 0.706725)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 55.15 using 59 PHA bins.
# Reduced chi-squared = 0.9675 for 57 degrees of freedom
# Null hypothesis probability = 5.449097e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.944e-08 5.275e-09
25- 50 4.812e-08 9.705e-09
50-150 2.489e-08 8.500e-09
15-150 9.245e-08 1.794e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 61.5879 (-19.5392 36.1438)
Norm : 10.3590 (-2.18903 2.7156)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 50.11 using 59 PHA bins.
# Reduced chi-squared = 0.8791 for 57 degrees of freedom
# Null hypothesis probability = 7.292553e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.614e-08 4.565e-09
25- 50 4.010e-08 6.520e-09
50-150 4.662e-08 1.544e-08
15-150 1.129e-07 2.296e-08
Double BB
R1^2/D10^2 : 1.30598 (-28.5688 6774.84)
kT2 [keV] : 200.000 (-200 -200)
R2^2/D10^2 : 1.15337E-04 (-7.28433e-05 0.000586668)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 50.19 using 59 PHA bins.
#Fit statistic : Chi-Squared = 49.72 using 59 PHA bins.
#Fit statistic : Chi-Squared = 49.56 using 59 PHA bins.
# Reduced chi-squared = 0.9126 for 55 degrees of freedom
# Reduced chi-squared = 0.9040 for 55 degrees of freedom
# Reduced chi-squared = 0.9012 for 55 degrees of freedom
# Null hypothesis probability = 6.584126e-01
# Null hypothesis probability = 6.759963e-01
# Null hypothesis probability = 6.816154e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.512e-08 1.321e-08
25- 50 4.248e-08 2.248e-08
50-150 3.292e-08 1.869e-08
15-150 1.005e-07 5.320e-08
Plot creation:
Wed Jan 30 06:51:30 EST 2019