batgrbproduct analysis for trigger=765081
batgrbproduct Analysis for Trigger=765081
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): Sat Jul 29 17:50:47 EDT 2017
Host Name: bat1
Current Working Dir: /local/data/bat1/prebascript/trigger765081/GCN5_download_cron
======================================================================
Trigger: 00765081 Segment: 000
BAT Trigger Time: 522953897.408 [s; MET]
Trigger Stop: 522953899.456 [s; MET]
UTC: 2017-07-28T16:57:57.968060 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 274.368255189849 Dec: -16.7217173369935 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 8.63
Image Trigger?: NO
Rate S/N Ratio: 10.1488915650922 [ if not an image trigger ]
Image S/N Ratio: 8.63
Flight Position: [ source = BAT ]
RA: 274.368255189849 Dec: -16.7217173369935 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 274.360431885198 Dec: -16.7212421220277 [deg; J2000]
{ 18h 17m 26.5s , -16d 43' 16.5" }
+/- 2.2728455778149 [arcmin] (estimated 90% radius based on SNR)
+/- 1.04516723159554 [arcmin] (formal 1-sigma fit error)
SNR: 9.41310202782811
Angular difference between Flight and Ground position is 0.450453 arcmin
Partial Coding Fraction: 0.8828125 [ including projection effects ]
Duration
T90: 9.33999997377396 +/- 1.06662084403458
Measured from: -4.08799988031387
to: 5.25200009346008 [s; relative to TRIGTIME]
T50: 4.77599996328354 +/- 2.85796637959823
Measured from: -2.58399987220764
to: 2.1920000910759 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 0.819999992847443
to: 1.81999999284744 [s; relative to TRIGTIME]
Total Fluence
Measured from: -4.43999999761581
to: 5.45200002193451 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.289471 0.047768 0.031346 0.031859
0.025019 0.021202 0.018816 0.019181 [error]
Peak 0.051509 0.010949 0.012805 -0.003713
0.008236 0.006688 0.005817 0.006247 [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 8.39e-08 2.40e-08 3.72e-09 6.58e-10 1.12e-07 1.12e-07 erg/cm2
Error 1.40e-08 1.01e-08 3.58e-09 1.29e-09 2.23e-08 2.25e-08 erg/cm2
Peak flux Power-law 4.74e-01 1.28e-01 1.86e-02 3.06e-03 6.23e-01 6.24e-01 ph/cm2/s
Error 1.30e-01 6.93e-02 2.60e-02 8.85e-03 1.71e-01 1.71e-01 ph/cm2/s
Fluence Cutoff-PL 9.01e-08 1.38e-08 4.03e-11 1.12e-16 1.04e-07 1.04e-07 erg/cm2
Error 1.61e-08 1.41e-08 3.46e-09 0.00e+00 1.55e-08 1.97e-08 erg/cm2
Peak flux Cutoff-PL 4.77e-01 1.22e-01 1.61e-02 2.49e-03 6.17e-01 6.19e-01 ph/cm2/s
Error 1.28e-01 9.55e-02 2.61e-02 8.85e-03 1.70e-01 1.71e-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 4.691 0.736 - - 2.99e-04 2.24e-04 71.390 57
CPL 1.000 0.000 50.0 0.0 4.34e-03 0.00e+00 131.270 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 3.787 1.076 - - 1.21e-03 1.18e-03 48.560 57
CPL -9.257 0.476 16.9 3.1 1.57e+08 2.32e+09 47.870 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 9.892 -4.440 5.452
T90 9.340 -4.088 5.252
T50 4.776 -2.584 2.192
Peak 1.000 0.820 1.820
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
274.3604 -16.7212 0.0205 15.9 57.4 0.4222 9.4 TRIG_00765081
------------------------------------------
Foreground time interval of the image:
-4.440 5.452 (delta_t = 9.892 [sec])
Background time interval of the image:
-239.408 -4.440 (delta_t = 234.968 [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 -4.440 sec. to 5.452 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 4.69081 ( -0.684466 0.787719 )
Norm@50keV : 2.98795E-04 ( -0.000169313 0.000278157 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 71.39 using 59 PHA bins.
# Reduced chi-squared = 1.252 for 57 degrees of freedom
# Null hypothesis probability = 9.510986e-02
Photon flux (15-150 keV) in 9.892 sec: 0.344333 ( -0.0585596 0.0586694 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.12062e-07 ( -2.16421e-08 2.28682e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -4.440 sec. to 5.452 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.00000 ( )
Epeak [keV] : 50.0000 ( )
Norm@50keV : 4.33723E-03 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 131.27 using 59 PHA bins.
# Reduced chi-squared = 2.3441 for 56 degrees of freedom
# Null hypothesis probability = 5.544671e-08
Photon flux (15-150 keV) in 9.892 sec: 0.342283 ( -0.056622 0.056683 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.03964e-07 ( -1.8563e-08 1.24382e-08 ) ergs/cm2
Band function
Time interval is from -4.440 sec. to 5.452 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -8.74365 ( 8.74365 8.74365 )
beta : -4.69081 ( -0.787757 0.684487 )
Epeak [keV] : 2.36415 ( -2.36415 -2.36415 )
Norm@50keV : 4.06105E-02 ( -0.0230094 0.0378055 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 71.39 using 59 PHA bins.
# Reduced chi-squared = 1.298 for 55 degrees of freedom
# Null hypothesis probability = 6.782724e-02
Photon flux (15-150 keV) in 9.892 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] : 2.95561 (-0.436976 0.528349)
R^2/D10^2 : 53.9013 (-53.9013 103.128)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 70.18 using 59 PHA bins.
# Reduced chi-squared = 1.231 for 57 degrees of freedom
# Null hypothesis probability = 1.127629e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 9.081e-08 4.779e-08
25- 50 1.256e-08 7.691e-09
50-150 1.791e-11 1.845e-11
15-150 1.034e-07 5.683e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 6.11901 (-1.41593 2.05132)
Norm : 40.6314 (-22.2818 55.3815)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 70.30 using 59 PHA bins.
# Reduced chi-squared = 1.233 for 57 degrees of freedom
# Null hypothesis probability = 1.108847e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 8.828e-08 4.020e-08
25- 50 1.707e-08 9.538e-09
50-150 2.233e-10 2.054e-10
15-150 1.056e-07 4.824e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 2.89994 (-0.429502 0.51185)
R1^2/D10^2 : 60.1521 (-39.8198 113.9)
kT2 [keV] : 88.2880 (-66.068 -88.6246)
R2^2/D10^2 : 9.04774E-05 (-8.13133e-05 0.00182186)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 64.39 using 59 PHA bins.
# Reduced chi-squared = 1.171 for 55 degrees of freedom
# Null hypothesis probability = 1.809556e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 9.030e-08 4.929e-08
25- 50 1.538e-08 8.291e-09
50-150 6.966e-08 5.455e-08
15-150 1.753e-07 9.532e-08
Peak spectrum fit
Power-law model
Time interval is from 0.820 sec. to 1.820 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 3.78722 ( -0.936522 1.21475 )
Norm@50keV : 1.21308E-03 ( -0.000875977 0.00149267 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 48.56 using 59 PHA bins.
# Reduced chi-squared = 0.8519 for 57 degrees of freedom
# Null hypothesis probability = 7.793867e-01
Photon flux (15-150 keV) in 1 sec: 0.622814 ( -0.170315 0.170784 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.29969e-08 ( -7.72446e-09 9.25585e-09 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.820 sec. to 1.820 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -9.25712 ( 9.27415 10.227 )
Epeak [keV] : 16.8812 ( -3.63041 2.49755 )
Norm@50keV : 1.56634E+08 ( -1.72574e+08 4.46323e+09 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 47.87 using 59 PHA bins.
# Reduced chi-squared = 0.8549 for 56 degrees of freedom
# Null hypothesis probability = 7.717548e-01
Photon flux (15-150 keV) in 1 sec: 0.616556 ( -0.164942 0.175889 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.29953e-08 ( -9.5514e-09 9.2232e-09 ) ergs/cm2
Band function
Time interval is from 0.820 sec. to 1.820 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 4.14141 ( 1.68739 1.68739 )
beta : -4.78535 ( 4.13738 1.2353 )
Epeak [keV] : 14.9173 ( -3.12491 75.4235 )
Norm@50keV : 7738.95 ( -7753.28 1.4923e+07 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 47.69 using 59 PHA bins.
# Reduced chi-squared = 0.8670 for 55 degrees of freedom
# Null hypothesis probability = 7.474594e-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] : 3.36156 (-0.741213 0.957423)
R^2/D10^2 : 42.3491 (-42.3491 148.586)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 48.44 using 59 PHA bins.
# Reduced chi-squared = 0.8498 for 57 degrees of freedom
# Null hypothesis probability = 7.829874e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.552e-08 8.700e-09
25- 50 3.311e-09 2.225e-09
50-150 1.275e-11 1.450e-11
15-150 1.884e-08 1.088e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 7.89114 (-2.9065 6.38477)
Norm : 35.3108 (-35.3108 88.4764)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 48.98 using 59 PHA bins.
# Reduced chi-squared = 0.8592 for 57 degrees of freedom
# Null hypothesis probability = 7.662961e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.483e-08 8.505e-09
25- 50 4.504e-09 3.013e-09
50-150 1.517e-10 1.698e-10
15-150 1.948e-08 1.162e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 3.15734 (-0.732877 0.892852)
R1^2/D10^2 : 57.8114 (-43.6478 97.4071)
kT2 [keV] : 29.2326 (-17.6609 -29.2668)
R2^2/D10^2 : 2.97377E-03 (-0.00293987 0.0348628)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 43.65 using 59 PHA bins.
# Reduced chi-squared = 0.7937 for 55 degrees of freedom
# Null hypothesis probability = 8.648131e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.515e-08 8.995e-09
25- 50 5.025e-09 2.708e-09
50-150 1.503e-08 1.017e-08
15-150 3.520e-08 1.777e-08
Plot creation:
Sat Jul 29 17:56:47 EDT 2017