batgrbproduct analysis for trigger=856977
batgrbproduct Analysis for Trigger=856977
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 Aug 29 18:55:46 EDT 2018
Host Name: bat1
Current Working Dir: /local/data/bat1/prebascript/trigger856977/GCN5_download_cron
======================================================================
Trigger: 00856977 Segment: 000
BAT Trigger Time: 557175476.288 [s; MET]
Trigger Stop: 557175477.312 [s; MET]
UTC: 2018-08-28T18:57:34.785720 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 268.699972359996 Dec: -25.7997839712606 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 16.5
Image Trigger?: NO
Rate S/N Ratio: 120.685541801825 [ if not an image trigger ]
Image S/N Ratio: 16.5
Flight Position: [ source = BAT ]
RA: 268.699972359996 Dec: -25.7997839712606 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 268.704385544829 Dec: -25.7911921082527 [deg; J2000]
{ 17h 54m 49.1s , -25d 47' 28.3" }
+/- 0.850372633121585 [arcmin] (estimated 90% radius based on SNR)
+/- 0.394024785186659 [arcmin] (formal 1-sigma fit error)
SNR: 38.3421585126801
Angular difference between Flight and Ground position is 0.567970 arcmin
Partial Coding Fraction: 0.1933594 [ including projection effects ]
Duration
T90: 14 +/- 8
Measured from: -7.28799986839294
to: 6.71200013160706 [s; relative to TRIGTIME]
T50: 4 +/- 1
Measured from: -4.28799986839294
to: -0.287999868392944 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: -0.287999987602234
to: 0.712000012397766 [s; relative to TRIGTIME]
Total Fluence
Measured from: -7.28799998760223
to: 28.7120000123978 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 1.476291 3.081589 4.238177 2.252278
0.102267 0.114768 0.115865 0.106814 [error]
Peak 0.231920 0.575142 0.970142 0.543006
0.024029 0.032455 0.040278 0.036787 [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 5.66e-07 1.51e-06 3.26e-06 1.83e-05 8.79e-06 2.36e-05 erg/cm2
Error 4.67e-08 7.48e-08 1.09e-07 1.47e-06 2.95e-07 1.48e-06 erg/cm2
Peak flux Power-law 2.77e+00 4.69e+00 6.05e+00 1.57e+01 1.78e+01 2.92e+01 ph/cm2/s
Error 3.34e-01 3.49e-01 2.99e-01 1.69e+00 9.25e-01 1.74e+00 ph/cm2/s
Fluence Cutoff-PL 5.47e-07 1.51e-06 3.31e-06 1.64e-05 8.78e-06 2.18e-05 erg/cm2
Error 4.81e-08 7.58e-08 1.27e-07 3.19e-06 2.97e-07 3.34e-06 erg/cm2
Peak flux Cutoff-PL 2.64e+00 4.70e+00 6.18e+00 1.40e+01 1.78e+01 2.75e+01 ph/cm2/s
Error 4.43e-01 3.56e-01 4.15e-01 3.24e+00 9.31e-01 3.14e+00 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 0.892 0.062 - - 2.17e-02 8.14e-04 47.180 57
CPL 0.791 0.189 787.7 0.0 2.37e-02 3.47e-03 46.670 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 0.633 0.090 - - 1.53e-01 8.54e-03 49.770 57
CPL 0.493 0.277 718.2 0.0 1.74e-01 3.90e-02 49.330 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: 7.936000 sec.
T50 in the 50-300 keV band: 4.352000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 36.000 -7.288 28.712
T90 14.000 -7.288 6.712
T50 4.000 -4.288 -0.288
Peak 1.000 -0.288 0.712
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
268.7044 -25.7912 0.0050 53.4 -7.4 11.3425 38.3 TRIG_00856977
------------------------------------------
Foreground time interval of the image:
-7.288 15.413 (delta_t = 22.701 [sec])
Background time interval of the image:
-239.288 -207.017 (delta_t = 32.271 [sec])
-206.288 -138.988 (delta_t = 67.300 [sec])
-138.288 -7.288 (delta_t = 131.000 [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 -7.288 sec. to 28.712 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.892293 ( -0.0629618 0.0620042 )
Norm@50keV : 2.16863E-02 ( -0.000816532 0.000810676 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 47.18 using 59 PHA bins.
# Reduced chi-squared = 0.8276 for 57 degrees of freedom
# Null hypothesis probability = 8.200772e-01
Photon flux (15-150 keV) in 36 sec: 2.48896 ( -0.0935782 0.0940618 ) ph/cm2/s
Energy fluence (15-150 keV) : 8.78796e-06 ( -2.94926e-07 2.95055e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -7.288 sec. to 28.712 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.790770 ( -0.25436 0.124405 )
Epeak [keV] : 787.663 ( -787.672 -787.672 )
Norm@50keV : 2.37113E-02 ( -0.00120044 0.00574872 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 46.67 using 59 PHA bins.
# Reduced chi-squared = 0.8334 for 56 degrees of freedom
# Null hypothesis probability = 8.083004e-01
Photon flux (15-150 keV) in 36 sec: 2.47626 ( -0.09779 0.0884 ) ph/cm2/s
Energy fluence (15-150 keV) : 8.78242e-06 ( -2.97216e-07 2.96784e-07 ) ergs/cm2
Band function
Time interval is from -7.288 sec. to 28.712 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.501859 ( 0.768293 0.768293 )
beta : -0.922739 ( -0.0619864 0.0629825 )
Epeak [keV] : 158.586 ( -156.602 9754.95 )
Norm@50keV : 3.52850E-02 ( -0.0155986 0 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 46.53 using 59 PHA bins.
# Reduced chi-squared = 0.8460 for 55 degrees of freedom
# Null hypothesis probability = 7.848778e-01
Photon flux (15-150 keV) in 36 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] : 27.3489 ( )
R^2/D10^2 : 4.69984E-02 ( )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 170.86 using 59 PHA bins.
# Reduced chi-squared = 2.9975 for 57 degrees of freedom
# Null hypothesis probability = 2.656496e-13
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.092e-07 1.586e-08
25- 50 1.240e-06 7.344e-08
50-150 6.751e-06 2.682e-07
15-150 8.199e-06 3.096e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 199.363 ( )
Norm : 10.9212 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 395.81 using 59 PHA bins.
# Reduced chi-squared = 6.9440 for 57 degrees of freedom
# Null hypothesis probability = 3.233489e-52
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 9.790e-07 3.978e-08
25- 50 1.883e-06 6.714e-08
50-150 4.130e-06 1.584e-07
15-150 6.993e-06 2.664e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 9.82668 (-1.47627 1.69058)
R1^2/D10^2 : 0.567888 (-0.208619 0.370447)
kT2 [keV] : 43.0470 (-5.46978 8.70905)
R2^2/D10^2 : 1.06887E-02 (-0.00436838 0.00543793)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 44.64 using 59 PHA bins.
# Reduced chi-squared = 0.8116 for 55 degrees of freedom
# Null hypothesis probability = 8.396842e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.868e-07 7.956e-08
25- 50 1.576e-06 1.645e-07
50-150 6.814e-06 8.874e-07
15-150 8.878e-06 9.522e-07
Peak spectrum fit
Power-law model
Time interval is from -0.288 sec. to 0.712 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.633253 ( -0.0905473 0.088502 )
Norm@50keV : 0.153374 ( -0.00858745 0.00849651 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 49.77 using 59 PHA bins.
# Reduced chi-squared = 0.8732 for 57 degrees of freedom
# Null hypothesis probability = 7.403823e-01
Photon flux (15-150 keV) in 1 sec: 17.8391 ( -0.924087 0.925227 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.93059e-06 ( -9.95158e-08 9.95472e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.288 sec. to 0.712 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.493110 ( -0.378557 0.174789 )
Epeak [keV] : 718.205 ( -718.205 -718.205 )
Norm@50keV : 0.173554 ( -0.0118901 0.0660215 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 49.33 using 59 PHA bins.
# Reduced chi-squared = 0.8808 for 56 degrees of freedom
# Null hypothesis probability = 7.237264e-01
Photon flux (15-150 keV) in 1 sec: 17.7897 ( -0.9306 0.9323 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.93298e-06 ( 0 0 ) ergs/cm2
Band function
Time interval is from -0.288 sec. to 0.712 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.853818 ( 0.853818 0.853818 )
beta : -0.633253 ( -0.0884538 0.090619 )
Epeak [keV] : 15.5866 ( -15.5866 -15.5866 )
Norm@50keV : 0.220101 ( -0.0781504 2.49602e+06 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 49.77 using 59 PHA bins.
# Reduced chi-squared = 0.9050 for 55 degrees of freedom
# Null hypothesis probability = 6.739569e-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] : 31.0662 (-2.22539 2.53766)
R^2/D10^2 : 0.258201 (-0.0511923 0.0610273)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 91.89 using 59 PHA bins.
# Reduced chi-squared = 1.612 for 57 degrees of freedom
# Null hypothesis probability = 2.334228e-03
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.815e-08 4.145e-09
25- 50 2.386e-07 2.165e-08
50-150 1.604e-06 1.040e-07
15-150 1.880e-06 1.120e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 199.363 ( )
Norm : 67.3227 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 329.82 using 59 PHA bins.
# Reduced chi-squared = 5.7864 for 57 degrees of freedom
# Null hypothesis probability = 4.719222e-40
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.676e-07 9.800e-09
25- 50 3.225e-07 2.295e-08
50-150 7.072e-07 1.354e-07
15-150 1.197e-06 2.021e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 8.74688 (-2.31307 3.20571)
R1^2/D10^2 : 4.24273 (-2.47001 7.32594)
kT2 [keV] : 43.2775 (-6.43381 12.4375)
R2^2/D10^2 : 9.37079E-02 (-0.0467839 0.0551356)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 48.40 using 59 PHA bins.
# Reduced chi-squared = 0.8800 for 55 degrees of freedom
# Null hypothesis probability = 7.230406e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 8.361e-08 3.066e-08
25- 50 2.755e-07 8.240e-08
50-150 1.609e-06 2.645e-07
15-150 1.968e-06 3.300e-07
Plot creation:
Wed Aug 29 19:01:00 EDT 2018