batgrbproduct analysis for trigger=924641
batgrbproduct Analysis for Trigger=924641
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 Sep 11 15:55:14 EDT 2019
Host Name: bat1
Current Working Dir: /local/data/bat1/prebascript/trigger924641/GCN5_download_cron
======================================================================
Trigger: 00924641 Segment: 000
BAT Trigger Time: 589791772.928 [s; MET]
Trigger Stop: 589791777.024 [s; MET]
UTC: 2019-09-10T07:02:29.370500 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 272.069655856209 Dec: 13.2575000725448 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 7.81
Image Trigger?: NO
Rate S/N Ratio: 10.0498756211209 [ if not an image trigger ]
Image S/N Ratio: 7.81
Flight Position: [ source = BAT ]
RA: 272.069655856209 Dec: 13.2575000725448 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 272.043688812413 Dec: 13.2751125510304 [deg; J2000]
{ 18h 08m 10.5s , +13d 16' 30.4" }
+/- 2.18429298938242 [arcmin] (estimated 90% radius based on SNR)
+/- 1.07699230326356 [arcmin] (formal 1-sigma fit error)
SNR: 9.96296338967738
Angular difference between Flight and Ground position is 1.848330 arcmin
Partial Coding Fraction: 0.65625 [ including projection effects ]
Duration
T90: 6.41600000858307 +/- 0.822406199273819
Measured from: -3.03199982643127
to: 3.38400018215179 [s; relative to TRIGTIME]
T50: 4.06400012969971 +/- 1.55276264731042
Measured from: -1.83199989795685
to: 2.23200023174286 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 0.73199999332428
to: 1.73199999332428 [s; relative to TRIGTIME]
Total Fluence
Measured from: -3.44799995422363
to: 3.81599998474121 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.321392 0.089668 0.016644 0.023309
0.027391 0.025331 0.021095 0.018451 [error]
Peak 0.053920 0.027234 0.010627 0.003451
0.010265 0.009412 0.008006 0.006557 [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 1.03e-07 3.89e-08 8.52e-09 2.23e-09 1.52e-07 1.53e-07 erg/cm2
Error 1.64e-08 1.40e-08 6.92e-09 3.68e-09 2.95e-08 3.06e-08 erg/cm2
Peak flux Power-law 5.39e-01 2.08e-01 4.67e-02 1.26e-02 8.02e-01 8.07e-01 ph/cm2/s
Error 1.62e-01 8.87e-02 4.17e-02 2.26e-02 2.29e-01 2.32e-01 ph/cm2/s
Fluence Cutoff-PL 1.03e-07 3.88e-08 8.14e-09 1.73e-09 1.52e-07 1.51e-07 erg/cm2
Error 1.66e-08 1.77e-08 8.62e-09 3.65e-09 3.14e-08 3.32e-08 erg/cm2
Peak flux Cutoff-PL 5.41e-01 2.10e-01 4.27e-02 8.49e-03 7.99e-01 8.03e-01 ph/cm2/s
Error 1.79e-01 1.23e-01 4.84e-02 1.47e-02 2.33e-01 1.79e-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 4.193 0.653 - - 8.22e-04 5.14e-04 79.260 57
CPL 1.000 0.000 50.0 0.0 8.33e-03 0.00e+00 139.180 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 3.156 0.828 - - 2.60e-03 1.80e-03 61.970 57
CPL 1.000 0.000 50.0 0.0 1.42e-02 0.00e+00 73.870 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 7.264 -3.448 3.816
T90 6.416 -3.032 3.384
T50 4.064 -1.832 2.232
Peak 1.000 0.732 1.732
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
272.0437 +13.2751 0.0192 23.4 141.5 0.4713 10.0 TRIG_00924641
------------------------------------------
Foreground time interval of the image:
-3.448 3.816 (delta_t = 7.264 [sec])
Background time interval of the image:
-239.928 -47.918 (delta_t = 192.010 [sec])
-46.928 -3.448 (delta_t = 43.480 [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 -3.448 sec. to 3.816 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 4.19304 ( -0.599448 0.705822 )
Norm@50keV : 8.21684E-04 ( -0.00042226 0.000606582 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 79.26 using 59 PHA bins.
# Reduced chi-squared = 1.391 for 57 degrees of freedom
# Null hypothesis probability = 2.722165e-02
Photon flux (15-150 keV) in 7.264 sec: 0.600847 ( -0.0953891 0.0956314 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.51823e-07 ( -2.84627e-08 3.05742e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -3.448 sec. to 3.816 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.00000 ( )
Epeak [keV] : 50.0000 ( )
Norm@50keV : 8.33038E-03 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 139.18 using 59 PHA bins.
# Reduced chi-squared = 2.4853 for 56 degrees of freedom
# Null hypothesis probability = 4.975543e-09
Photon flux (15-150 keV) in 7.264 sec: 0.600370 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 1.51514e-07 ( -3.26524e-08 3.01935e-08 ) ergs/cm2
Band function
Time interval is from -3.448 sec. to 3.816 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.33274 ( )
beta : -8.28327 ( )
Epeak [keV] : 49.1758 ( )
Norm@50keV : 6.00098E-03 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 135.04 using 59 PHA bins.
# Reduced chi-squared = 2.4553 for 55 degrees of freedom
# Null hypothesis probability = 1.114151e-08
Photon flux (15-150 keV) in 7.264 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] : 3.28682 (-0.517583 0.646495)
R^2/D10^2 : 46.7259 (-30.1553 89.4755)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 81.37 using 59 PHA bins.
# Reduced chi-squared = 1.428 for 57 degrees of freedom
# Null hypothesis probability = 1.872750e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.095e-07 4.976e-08
25- 50 2.171e-08 1.297e-08
50-150 7.096e-11 7.658e-11
15-150 1.313e-07 5.947e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 7.63219 (-1.96669 2.96668)
Norm : 37.7560 (-19.7275 48.2096)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 79.93 using 59 PHA bins.
# Reduced chi-squared = 1.402 for 57 degrees of freedom
# Null hypothesis probability = 2.422695e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.067e-07 3.684e-08
25- 50 3.071e-08 1.508e-08
50-150 9.245e-10 8.752e-10
15-150 1.384e-07 4.901e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 3.00583 (-1.23363 0.729349)
R1^2/D10^2 : 75.2146 (-38.0551 32904.5)
kT2 [keV] : 13.5995 (-7.42467 -13.3608)
R2^2/D10^2 : 1.62894E-02 (-0.017732 39.2976)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 78.54 using 59 PHA bins.
# Reduced chi-squared = 1.428 for 55 degrees of freedom
# Null hypothesis probability = 2.029787e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.080e-07 5.895e-08
25- 50 3.190e-08 1.678e-08
50-150 2.009e-08 1.942e-08
15-150 1.600e-07 8.295e-08
Peak spectrum fit
Power-law model
Time interval is from 0.732 sec. to 1.732 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 3.15601 ( -0.694751 0.960354 )
Norm@50keV : 2.59832E-03 ( -0.00161997 0.0019762 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 61.97 using 59 PHA bins.
# Reduced chi-squared = 1.087 for 57 degrees of freedom
# Null hypothesis probability = 3.035384e-01
Photon flux (15-150 keV) in 1 sec: 0.802232 ( -0.228536 0.229291 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.36784e-08 ( -1.19748e-08 1.36702e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.732 sec. to 1.732 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.00000 ( )
Epeak [keV] : 50.0000 ( )
Norm@50keV : 1.42369E-02 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 73.87 using 59 PHA bins.
# Reduced chi-squared = 1.319 for 56 degrees of freedom
# Null hypothesis probability = 5.502781e-02
Photon flux (15-150 keV) in 1 sec: 0.798622 ( -0.234716 0.231788 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.20696e-08 ( -1.28561e-08 1.50405e-08 ) ergs/cm2
Band function
Time interval is from 0.732 sec. to 1.732 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 4.14463 ( 0.999898 0.999898 )
beta : -3.56102 ( 3.39747 0.891588 )
Epeak [keV] : 16.7350 ( -12.1178 51.1221 )
Norm@50keV : 3750.93 ( -3757.07 9.48059e+06 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 61.17 using 59 PHA bins.
# Reduced chi-squared = 1.112 for 55 degrees of freedom
# Null hypothesis probability = 2.641049e-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] : 4.51571 (-1.20038 1.61215)
R^2/D10^2 : 11.0680 (-11.068 42.379)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 62.48 using 59 PHA bins.
# Reduced chi-squared = 1.096 for 57 degrees of freedom
# Null hypothesis probability = 2.878582e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.758e-08 1.016e-08
25- 50 8.855e-09 5.875e-09
50-150 2.144e-10 2.054e-10
15-150 2.665e-08 1.599e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 14.1082 (-6.33463 14.0148)
Norm : 15.5864 (-9.13604 27.8279)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 61.99 using 59 PHA bins.
# Reduced chi-squared = 1.088 for 57 degrees of freedom
# Null hypothesis probability = 3.026322e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.681e-08 9.433e-09
25- 50 1.078e-08 6.698e-09
50-150 1.673e-09 1.677e-09
15-150 2.926e-08 1.761e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 4.09468 (-4.09468 1.70523)
R1^2/D10^2 : 16.6673 (-16.6673 -16.6673)
kT2 [keV] : 20.0168 (-20.0168 -20.0168)
R2^2/D10^2 : 7.24938E-03 (-0.00724937 33.3374)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 61.18 using 59 PHA bins.
# Reduced chi-squared = 1.112 for 55 degrees of freedom
# Null hypothesis probability = 2.639484e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.752e-08 1.006e-08
25- 50 9.332e-09 5.400e-09
50-150 8.379e-09 8.060e-09
15-150 3.523e-08 2.049e-08
Plot creation:
Wed Sep 11 15:58:07 EDT 2019