batgrbproduct analysis for trigger=904394
batgrbproduct Analysis for Trigger=904394
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): Mon May 20 12:13:16 EDT 2019
Host Name: bat1
Current Working Dir: /local/data/bat1/prebascript/trigger904394/GCN5_download_cron
======================================================================
Trigger: 00904394 Segment: 000
BAT Trigger Time: 579943562.368 [s; MET]
Trigger Stop: 579943562.88 [s; MET]
UTC: 2019-05-19T07:25:39.438900 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 114.764434750018 Dec: -38.8241293159876 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 6.76
Image Trigger?: NO
Rate S/N Ratio: 45.0222167379617 [ if not an image trigger ]
Image S/N Ratio: 6.76
Flight Position: [ source = BAT ]
RA: 114.764434750018 Dec: -38.8241293159876 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 114.757740572394 Dec: -38.8129492848746 [deg; J2000]
{ 07h 39m 01.9s , -38d 48' 46.6" }
+/- 1.66568271151669 [arcmin] (estimated 90% radius based on SNR)
+/- 0.660289741719227 [arcmin] (formal 1-sigma fit error)
SNR: 14.6743199069688
Angular difference between Flight and Ground position is 0.740207 arcmin
Partial Coding Fraction: 0.08105469 [ including projection effects ]
Duration
T90: 45.5839999914169 +/- 2.85630253194435
Measured from: -42.0559998750687
to: 3.52800011634827 [s; relative to TRIGTIME]
T50: 26.8159999847412 +/- 1.43108350559987
Measured from: -26.8719998598099
to: -0.0559998750686646 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: -0.212000012397766
to: 0.787999987602234 [s; relative to TRIGTIME]
Total Fluence
Measured from: -56.9680000543594
to: 14.7919999361038 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 8.376241 11.491105 7.770694 1.635358
0.277555 0.304119 0.269258 0.192520 [error]
Peak 0.484910 0.964768 0.858303 0.305594
0.054710 0.072380 0.071786 0.043405 [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 3.18e-06 5.12e-06 6.24e-06 1.49e-05 1.88e-05 2.95e-05 erg/cm2
Error 1.90e-07 1.83e-07 2.71e-07 1.40e-06 6.57e-07 1.60e-06 erg/cm2
Peak flux Power-law 6.14e+00 6.71e+00 5.22e+00 6.68e+00 2.06e+01 2.47e+01 ph/cm2/s
Error 8.21e-01 6.01e-01 4.99e-01 1.20e+00 1.74e+00 2.09e+00 ph/cm2/s
Fluence Cutoff-PL 2.93e-06 5.28e-06 6.43e-06 8.95e-06 1.84e-05 2.36e-05 erg/cm2
Error 2.33e-07 2.10e-07 3.02e-07 2.64e-06 7.11e-07 2.70e-06 erg/cm2
Peak flux Cutoff-PL 5.07e+00 7.49e+00 6.05e+00 3.00e+00 2.06e+01 2.16e+01 ph/cm2/s
Error 9.65e-01 7.51e-01 6.73e-01 1.24e+00 1.74e+00 2.05e+00 ph/cm2/s
Fluence Band 2.82e-06 5.38e-06 6.21e-06 1.27e-05 1.83e-05 2.71e-05 erg/cm2
Error 2.69e-07 -------- 3.53e-07 -------- 7.03e-07 -------- erg/cm2
Peak flux Band 5.05e+00 7.50e+00 6.04e+00 3.49e+00 2.05e+01 2.21e+01 ph/cm2/s
Error -------- 9.71e-01 -------- -------- 1.75e+00 -------- ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.715 0.060 - - 2.83e-02 9.58e-04 85.040 57
CPL 1.321 0.240 90.0 35.0 4.39e-02 1.16e-02 76.360 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.361 0.119 - - 1.70e-01 1.42e-02 51.170 57
CPL 0.343 0.554 88.1 26.3 5.34e-01 3.51e-01 39.030 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: 43.072000 sec.
T50 in the 50-300 keV band: 20.992000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 71.760 -56.968 14.792
T90 45.584 -42.056 3.528
T50 26.816 -26.872 -0.056
Peak 1.000 -0.212 0.788
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
114.7577 -38.8129 0.0131 39.9 128.8 24.7625 14.7 TRIG_00904394
------------------------------------------
Foreground time interval of the image:
-28.267 14.533 (delta_t = 42.800 [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 -56.968 sec. to 14.792 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.71518 ( -0.0597713 0.0601339 )
Norm@50keV : 2.83125E-02 ( -0.000958781 0.000957574 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 85.04 using 59 PHA bins.
# Reduced chi-squared = 1.492 for 57 degrees of freedom
# Null hypothesis probability = 9.428312e-03
Photon flux (15-150 keV) in 71.76 sec: 3.78038 ( -0.136756 0.137124 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.87896e-05 ( -6.56379e-07 6.57381e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -56.968 sec. to 14.792 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.32086 ( -0.246367 0.232779 )
Epeak [keV] : 90.0336 ( -16.6723 53.237 )
Norm@50keV : 4.38940E-02 ( -0.0097718 0.0134247 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 76.36 using 59 PHA bins.
# Reduced chi-squared = 1.364 for 56 degrees of freedom
# Null hypothesis probability = 3.659326e-02
Photon flux (15-150 keV) in 71.76 sec: 3.68573 ( -0.14608 0.14658 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.83508e-05 ( -7.11931e-07 7.09922e-07 ) ergs/cm2
Band function
Time interval is from -56.968 sec. to 14.792 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.32081 ( -0.17392 0.311775 )
beta : -10.0000 ( 10 3.19744e-14 )
Epeak [keV] : 90.0151 ( -16.6541 53.0158 )
Norm@50keV : 4.38900E-02 ( -0.00978667 0.0134282 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 76.36 using 59 PHA bins.
# Reduced chi-squared = 1.388 for 55 degrees of freedom
# Null hypothesis probability = 2.991819e-02
Photon flux (15-150 keV) in 71.76 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 1.83375e-05 ( -1.8337e-05 -7.02817e-07 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 14.3142 ( )
R^2/D10^2 : 0.470612 ( )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 277.82 using 59 PHA bins.
# Reduced chi-squared = 4.8740 for 57 degrees of freedom
# Null hypothesis probability = 8.584104e-31
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.458e-06 9.795e-08
25- 50 5.543e-06 2.293e-07
50-150 7.562e-06 5.120e-07
15-150 1.456e-05 5.705e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 141.630 (-21.1218 22.4935)
Norm : 15.4694 (-0.641759 0.785348)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 76.46 using 59 PHA bins.
# Reduced chi-squared = 1.341 for 57 degrees of freedom
# Null hypothesis probability = 4.363903e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.864e-06 1.826e-07
25- 50 5.264e-06 3.096e-07
50-150 1.014e-05 2.400e-06
15-150 1.827e-05 2.608e-06
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 7.35093 (-0.758418 0.787887)
R1^2/D10^2 : 3.57032 (-1.04784 1.66884)
kT2 [keV] : 25.9593 (-2.7273 3.54324)
R2^2/D10^2 : 4.03087E-02 (-0.0154398 0.0218889)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 73.88 using 59 PHA bins.
# Reduced chi-squared = 1.343 for 55 degrees of freedom
# Null hypothesis probability = 4.552033e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.665e-06 3.010e-07
25- 50 5.425e-06 4.410e-07
50-150 1.022e-05 1.173e-06
15-150 1.831e-05 1.618e-06
Peak spectrum fit
Power-law model
Time interval is from -0.212 sec. to 0.788 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.36137 ( -0.118842 0.119828 )
Norm@50keV : 0.170316 ( -0.0141602 0.0141506 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 51.17 using 59 PHA bins.
# Reduced chi-squared = 0.8977 for 57 degrees of freedom
# Null hypothesis probability = 6.924932e-01
Photon flux (15-150 keV) in 1 sec: 20.5668 ( -1.73459 1.7355 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.65924e-06 ( -1.4848e-07 1.48742e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.212 sec. to 0.788 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.342709 ( -0.587226 0.521229 )
Epeak [keV] : 88.1365 ( -15.5003 37.0051 )
Norm@50keV : 0.534500 ( -0.231524 0.470936 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 39.03 using 59 PHA bins.
# Reduced chi-squared = 0.6969 for 56 degrees of freedom
# Null hypothesis probability = 9.588575e-01
Photon flux (15-150 keV) in 1 sec: 20.5611 ( -1.7379 1.7385 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.65134e-06 ( 0 0 ) ergs/cm2
Band function
Time interval is from -0.212 sec. to 0.788 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.375146 ( -0.488818 0.330263 )
beta : -2.69512 ( 2.55717 10.4925 )
Epeak [keV] : 88.9801 ( -51.764 36.6654 )
Norm@50keV : 0.516727 ( -0.194037 374.005 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 39.03 using 59 PHA bins.
# Reduced chi-squared = 0.7097 for 55 degrees of freedom
# Null hypothesis probability = 9.490674e-01
Photon flux (15-150 keV) in 1 sec: 20.5323 ( -13.5323 -1.7522 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.64562e-06 ( 0 0 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 17.2643 (-1.5555 1.69122)
R^2/D10^2 : 1.65414 (-0.45652 0.624861)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 58.58 using 59 PHA bins.
# Reduced chi-squared = 1.028 for 57 degrees of freedom
# Null hypothesis probability = 4.173289e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 9.998e-08 1.471e-08
25- 50 4.478e-07 4.700e-08
50-150 9.575e-07 1.423e-07
15-150 1.505e-06 1.490e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 200.000 (-24.738 -200)
Norm : 86.2516 (-7.14707 7.14707)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 52.79 using 59 PHA bins.
# Reduced chi-squared = 0.9262 for 57 degrees of freedom
# Null hypothesis probability = 6.335686e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.147e-07 2.005e-08
25- 50 4.131e-07 5.565e-08
50-150 9.059e-07 2.794e-07
15-150 1.534e-06 3.772e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 8.31331 (-2.51382 3.35948)
R1^2/D10^2 : 9.52795 (-5.49764 18.1948)
kT2 [keV] : 25.2140 (-4.73287 12.2564)
R2^2/D10^2 : 0.336526 (-0.268166 0.452311)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 38.03 using 59 PHA bins.
# Reduced chi-squared = 0.6915 for 55 degrees of freedom
# Null hypothesis probability = 9.605689e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.593e-07 7.425e-08
25- 50 4.394e-07 1.416e-07
50-150 1.061e-06 5.057e-07
15-150 1.659e-06 6.919e-07
Plot creation:
Mon May 20 12:18:17 EDT 2019