batgrbproduct analysis for trigger=741570
batgrbproduct Analysis for Trigger=741570
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 Mar 8 20:29:36 EST 2017
Host Name: bat1
Current Working Dir: /local/data/bat1/prebascript/trigger741570/GCN5_download_cron
======================================================================
Trigger: 00741570 Segment: 000
BAT Trigger Time: 510639712 [s; MET]
Trigger Stop: 510639776 [s; MET]
UTC: 2017-03-08T04:21:33.279180 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 83.8258891611408 Dec: 21.7801489831598 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 14.19
Image Trigger?: YES
Rate S/N Ratio: 0 [ if not an image trigger ]
Image S/N Ratio: 14.19
Flight Position: [ source = BAT ]
RA: 83.8258891611408 Dec: 21.7801489831598 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 83.826164993198 Dec: 21.7730047269062 [deg; J2000]
{ 05h 35m 18.3s , +21d 46' 22.8" }
+/- 1.46386383737665 [arcmin] (estimated 90% radius based on SNR)
+/- 0.44802403832251 [arcmin] (formal 1-sigma fit error)
SNR: 17.6477293149553
Angular difference between Flight and Ground position is 0.428931 arcmin
Partial Coding Fraction: 0.453125 [ including projection effects ]
Duration
T90: 156.767999947071 +/- 17.1150068935675
Measured from: -83.3159998655319
to: 73.4520000815392 [s; relative to TRIGTIME]
T50: 80.067999958992 +/- 15.9991161939866
Measured from: -49.0679998993874
to: 31.0000000596046 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: -64.4599999785423
to: -63.4599999785423 [s; relative to TRIGTIME]
Total Fluence
Measured from: -91.1959999799728
to: 99.3640000224113 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 2.767639 2.647492 1.353665 0.210943
0.126220 0.129838 0.111218 0.096543 [error]
Peak 0.031220 0.039983 0.014794 0.001017
0.008745 0.008828 0.007427 0.006808 [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 9.47e-07 1.19e-06 1.08e-06 1.72e-06 3.81e-06 4.94e-06 erg/cm2
Error 8.61e-08 6.88e-08 1.11e-07 3.59e-07 2.49e-07 4.69e-07 erg/cm2
Peak flux Power-law 3.23e-01 2.62e-01 1.44e-01 1.16e-01 7.81e-01 8.46e-01 ph/cm2/s
Error 1.39e-01 7.32e-02 6.17e-02 1.01e-01 2.20e-01 2.36e-01 ph/cm2/s
Fluence Cutoff-PL 9.28e-07 1.21e-06 1.08e-06 1.27e-06 3.74e-06 4.49e-06 erg/cm2
Error 1.00e-07 8.67e-08 1.15e-07 7.56e-07 2.60e-07 8.21e-07 erg/cm2
Peak flux Cutoff-PL 3.29e-01 2.62e-01 1.42e-01 1.11e-01 7.83e-01 8.46e-01 ph/cm2/s
Error 1.40e-01 7.34e-02 6.21e-02 1.21e-01 2.20e-01 2.48e-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 2.133 0.120 - - 2.14e-03 1.56e-04 43.490 57
CPL 1.965 0.274 9.1 -1.0 2.65e-03 1.38e-03 43.100 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.863 0.543 - - 5.53e-03 1.82e-03 45.880 57
CPL 1.880 2.760 9944.2 0.0 5.41e-03 0.00e+00 45.880 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 190.560 -91.196 99.364
T90 156.768 -83.316 73.452
T50 80.068 -49.068 31.000
Peak 1.000 -64.460 -63.460
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
83.8262 +21.7730 0.0108 37.0 161.9 3.4460 17.6 TRIG_00741570
------------------------------------------
Foreground time interval of the image:
-17.899 70.001 (delta_t = 87.900 [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
Time interval is from -91.196 sec. to 99.364 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.13269 ( -0.118009 0.121808 )
Norm@50keV : 2.14204E-03 ( -0.000156859 0.000154471 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 43.49 using 59 PHA bins.
# Reduced chi-squared = 0.7629 for 57 degrees of freedom
# Null hypothesis probability = 9.063046e-01
Photon flux (15-150 keV) in 190.6 sec: 0.342539 ( -0.0205985 0.0206678 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.80621e-06 ( -2.48045e-07 2.50258e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -91.196 sec. to 99.364 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.96509 ( -0.510081 0.0369447 )
Epeak [keV] : 9.13890 ( -7.1151 -9.1389 )
Norm@50keV : 2.65108E-03 ( -0.000396786 0.00237087 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 43.10 using 59 PHA bins.
# Reduced chi-squared = 0.7696 for 56 degrees of freedom
# Null hypothesis probability = 8.967651e-01
Photon flux (15-150 keV) in 190.6 sec: 0.339012 ( -0.022587 0.022448 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.74441e-06 ( -2.98632e-07 2.22087e-07 ) ergs/cm2
Band function
Time interval is from -91.196 sec. to 99.364 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.88006 ( 1.82008 1.82008 )
beta : -2.36642 ( 2.39768 0.372372 )
Epeak [keV] : 20.3984 ( -20.3983 18.9771 )
Norm@50keV : 2.96278E-03 ( -0.000308345 2.28245 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 42.95 using 59 PHA bins.
# Reduced chi-squared = 0.7809 for 55 degrees of freedom
# Null hypothesis probability = 8.811607e-01
Photon flux (15-150 keV) in 190.6 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] : 10.2822 (-0.734212 0.782773)
R^2/D10^2 : 0.133017 (-0.0332373 0.0449332)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 112.65 using 59 PHA bins.
# Reduced chi-squared = 1.9763 for 57 degrees of freedom
# Null hypothesis probability = 1.593791e-05
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.508e-07 6.023e-08
25- 50 1.424e-06 9.778e-08
50-150 8.049e-07 1.252e-07
15-150 2.779e-06 1.925e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 59.0142 (-9.77044 12.5675)
Norm : 1.75901 (-0.187001 0.197268)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 47.34 using 59 PHA bins.
# Reduced chi-squared = 0.8305 for 57 degrees of freedom
# Null hypothesis probability = 8.155467e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 8.403e-07 7.033e-08
25- 50 1.272e-06 8.120e-08
50-150 1.428e-06 2.070e-07
15-150 3.541e-06 2.535e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 4.12495 (-0.699695 0.86883)
R1^2/D10^2 : 3.68493 (-2.11011 5.55485)
kT2 [keV] : 15.1439 (-1.79906 2.46822)
R2^2/D10^2 : 2.38191E-02 (-0.0112272 0.0167335)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 43.97 using 59 PHA bins.
# Reduced chi-squared = 0.7995 for 55 degrees of freedom
# Null hypothesis probability = 8.569021e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 9.576e-07 3.563e-07
25- 50 1.164e-06 1.981e-07
50-150 1.372e-06 2.985e-07
15-150 3.493e-06 7.176e-07
Peak spectrum fit
Power-law model
Time interval is from -64.460 sec. to -63.460 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.86253 ( -0.51226 0.574539 )
Norm@50keV : 5.53010E-03 ( -0.00187986 0.00175287 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 45.88 using 59 PHA bins.
# Reduced chi-squared = 0.8049 for 57 degrees of freedom
# Null hypothesis probability = 8.542653e-01
Photon flux (15-150 keV) in 1 sec: 0.781301 ( -0.219394 0.219739 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.08414e-08 ( -1.62928e-08 1.68439e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -64.460 sec. to -63.460 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.87999 ( -2.53031 2.98877 )
Epeak [keV] : 9944.18 ( )
Norm@50keV : 5.40915E-03 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 45.88 using 59 PHA bins.
# Reduced chi-squared = 0.8193 for 56 degrees of freedom
# Null hypothesis probability = 8.306652e-01
Photon flux (15-150 keV) in 1 sec: 0.782604 ( -0.22112 0.218416 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.09005e-08 ( -1.76675e-08 1.65149e-08 ) ergs/cm2
Band function
Time interval is from -64.460 sec. to -63.460 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 1.99439 ( 1.49158 1.49158 )
beta : -1.87233 ( 1.93386 0.582773 )
Epeak [keV] : 18.0613 ( -51.1628 -51.1628 )
Norm@50keV : 15.3684 ( -15.3875 1.61016e+06 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 45.85 using 59 PHA bins.
# Reduced chi-squared = 0.8337 for 55 degrees of freedom
# Null hypothesis probability = 8.053962e-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] : 9.90427 (-2.74668 4.22887)
R^2/D10^2 : 0.376443 (-0.376136 0.931774)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 49.37 using 59 PHA bins.
# Reduced chi-squared = 0.8662 for 57 degrees of freedom
# Null hypothesis probability = 7.535903e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 7.495e-09 4.686e-09
25- 50 1.838e-08 1.031e-08
50-150 9.330e-09 6.736e-09
15-150 3.521e-08 2.193e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 91.5995 (-56.7492 -91.6124)
Norm : 3.50109 (-1.21299 2.25492)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 46.40 using 59 PHA bins.
# Reduced chi-squared = 0.8140 for 57 degrees of freedom
# Null hypothesis probability = 8.409602e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 9.140e-09 5.447e-09
25- 50 1.552e-08 9.730e-09
50-150 2.388e-08 2.013e-08
15-150 4.854e-08 3.306e-08
Double BB
------------------------------------------------------------
#Fit statistic : Chi-Squared = 47.99 using 59 PHA bins.
#Fit statistic : Chi-Squared = 44.95 using 59 PHA bins.
#Fit statistic : Chi-Squared = 44.92 using 59 PHA bins.
#Fit statistic : Chi-Squared = 44.89 using 59 PHA bins.
# Reduced chi-squared = 0.8725 for 55 degrees of freedom
# Reduced chi-squared = 0.8173 for 55 degrees of freedom
# Reduced chi-squared = 0.8168 for 55 degrees of freedom
# Reduced chi-squared = 0.8161 for 55 degrees of freedom
# Null hypothesis probability = 7.372619e-01
# Null hypothesis probability = 8.312757e-01
# Null hypothesis probability = 8.319787e-01
# Null hypothesis probability = 8.329449e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 9.528e-09 4.906e-09
25- 50 1.603e-08 9.545e-09
50-150 1.364e-08 9.280e-09
15-150 3.920e-08 2.178e-08
Plot creation:
Wed Mar 8 20:49:38 EST 2017