batgrbproduct analysis for trigger=903158
batgrbproduct Analysis for Trigger=903158
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): Sun May 12 14:20:18 EDT 2019
Host Name: bat1
Current Working Dir: /local/data/bat1/prebascript/trigger903158/GCN5_download_cron
======================================================================
Trigger: 00903158 Segment: 000
BAT Trigger Time: 579251711.168 [s; MET]
Trigger Stop: 579251715.264 [s; MET]
UTC: 2019-05-11T07:14:48.282980 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 126.436247844037 Dec: -20.241918781366 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 9.72
Image Trigger?: NO
Rate S/N Ratio: 38.7040049607273 [ if not an image trigger ]
Image S/N Ratio: 9.72
Flight Position: [ source = BAT ]
RA: 126.436247844037 Dec: -20.241918781366 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 126.442698186267 Dec: -20.2515494407279 [deg; J2000]
{ 08h 25m 46.2s , -20d 15' 05.6" }
+/- 1.54691893688771 [arcmin] (estimated 90% radius based on SNR)
+/- 0.572800255593443 [arcmin] (formal 1-sigma fit error)
SNR: 16.3098678749205
Angular difference between Flight and Ground position is 0.682455 arcmin
Partial Coding Fraction: 0.09082031 [ including projection effects ]
Duration
T90: 27.6640000343323 +/- 2.35417588983274
Measured from: -21.7919998168945
to: 5.87200021743774 [s; relative to TRIGTIME]
T50: 15.7760000228882 +/- 1.76443078401425
Measured from: -14.2399998903275
to: 1.53600013256073 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 0.356000065803528
to: 1.35600006580353 [s; relative to TRIGTIME]
Total Fluence
Measured from: -24.2719999551773
to: 6.87999999523163 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 1.475662 3.313798 3.521651 1.609067
0.182709 0.210977 0.202131 0.163414 [error]
Peak 0.065966 0.274117 0.373941 0.093438
0.035258 0.047787 0.050260 0.037137 [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 6.98e-07 1.55e-06 2.72e-06 1.11e-05 7.43e-06 1.61e-05 erg/cm2
Error 9.15e-08 1.26e-07 1.83e-07 1.63e-06 4.82e-07 1.71e-06 erg/cm2
Peak flux Power-law 1.68e+00 1.98e+00 1.69e+00 2.45e+00 6.23e+00 7.80e+00 ph/cm2/s
Error 5.58e-01 4.45e-01 3.34e-01 8.76e-01 1.25e+00 1.48e+00 ph/cm2/s
Fluence Cutoff-PL 5.95e-07 1.61e-06 2.95e-06 5.82e-06 7.36e-06 1.10e-05 erg/cm2
Error 1.13e-07 1.40e-07 2.45e-07 2.67e-06 4.92e-07 2.62e-06 erg/cm2
Peak flux Cutoff-PL 8.10e-01 2.23e+00 2.40e+00 6.95e-01 6.02e+00 6.14e+00 ph/cm2/s
Error 5.66e-01 5.88e-01 5.16e-01 -------- 1.23e+00 1.31e+00 ph/cm2/s
Fluence Band -------- -------- -------- -------- -------- -------- erg/cm2
Error -------- -------- -------- -------- -------- -------- erg/cm2
Peak flux Band 8.29e-01 2.28e+00 2.46e+00 7.15e-01 6.16e+00 6.28e+00 ph/cm2/s
Error -------- 5.74e-01 5.03e-01 -------- -------- -------- ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.191 0.105 - - 2.34e-02 1.55e-03 63.080 57
CPL 0.578 0.467 138.3 111.2 4.33e-02 2.06e-02 57.300 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.231 0.261 - - 5.28e-02 1.01e-02 66.700 57
CPL -1.414 1.781 77.0 19.1 7.27e-01 2.45e+00 55.050 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: 28.416000 sec.
T50 in the 50-300 keV band: 15.872000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 31.152 -24.272 6.880
T90 27.664 -21.792 5.872
T50 15.776 -14.240 1.536
Peak 1.000 0.356 1.356
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
126.4427 -20.2515 0.0118 56.3 -4.3 10.8182 16.3 TRIG_00903158
------------------------------------------
Foreground time interval of the image:
-24.272 6.880 (delta_t = 31.152 [sec])
Background time interval of the image:
-87.267 -24.272 (delta_t = 62.995 [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 -24.272 sec. to 6.880 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.19090 ( -0.105923 0.103894 )
Norm@50keV : 2.34345E-02 ( -0.00154824 0.00154209 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 63.08 using 59 PHA bins.
# Reduced chi-squared = 1.107 for 57 degrees of freedom
# Null hypothesis probability = 2.701484e-01
Photon flux (15-150 keV) in 31.15 sec: 2.74727 ( -0.19471 0.195508 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.42516e-06 ( -4.81436e-07 4.81669e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -24.272 sec. to 6.880 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.578001 ( -0.491417 0.441955 )
Epeak [keV] : 138.259 ( -36.5601 185.878 )
Norm@50keV : 4.32780E-02 ( -0.0151745 0.0259617 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 57.30 using 59 PHA bins.
# Reduced chi-squared = 1.023 for 56 degrees of freedom
# Null hypothesis probability = 4.268418e-01
Photon flux (15-150 keV) in 31.15 sec: 2.69041 ( -0.19764 0.19881 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.35803e-06 ( -4.93011e-07 4.91142e-07 ) ergs/cm2
Band function
Time interval is from -24.272 sec. to 6.880 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 4.97521 ( -14.6267 -4.97521 )
beta : -1.33230 ( -0.129086 0.126796 )
Epeak [keV] : 32.7044 ( -5.51397 4.95393 )
Norm@50keV : 377.652 ( -23.8408 790.461 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 52.73 using 59 PHA bins.
# Reduced chi-squared = 0.9587 for 55 degrees of freedom
# Null hypothesis probability = 5.619650e-01
Photon flux (15-150 keV) in 31.15 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] : 20.8907 (-1.54526 1.72712)
R^2/D10^2 : 0.114005 (-0.0272166 0.0344562)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 90.03 using 59 PHA bins.
# Reduced chi-squared = 1.579 for 57 degrees of freedom
# Null hypothesis probability = 3.456537e-03
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.935e-07 4.000e-08
25- 50 1.504e-06 1.509e-07
50-150 4.888e-06 4.486e-07
15-150 6.685e-06 5.062e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 200.000 (-9.89283 -200)
Norm : 11.9854 (-0.782916 0.782916)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 97.13 using 59 PHA bins.
# Reduced chi-squared = 1.704 for 57 degrees of freedom
# Null hypothesis probability = 7.320899e-04
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 9.301e-07 6.682e-08
25- 50 1.789e-06 1.408e-07
50-150 3.924e-06 7.772e-07
15-150 6.643e-06 8.769e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 11.0014 (-2.913 3.391)
R1^2/D10^2 : 0.572229 (-0.279029 0.755206)
kT2 [keV] : 38.9521 (-10.6759 56.8182)
R2^2/D10^2 : 1.09211E-02 (-0.00950302 0.0231683)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 54.83 using 59 PHA bins.
# Reduced chi-squared = 0.9969 for 55 degrees of freedom
# Null hypothesis probability = 4.811833e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.186e-07 1.607e-07
25- 50 1.734e-06 4.967e-07
50-150 5.119e-06 2.097e-06
15-150 7.372e-06 2.609e-06
Peak spectrum fit
Power-law model
Time interval is from 0.356 sec. to 1.356 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.23107 ( -0.263657 0.259203 )
Norm@50keV : 5.28072E-02 ( -0.0101098 0.010082 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 66.70 using 59 PHA bins.
# Reduced chi-squared = 1.170 for 57 degrees of freedom
# Null hypothesis probability = 1.778568e-01
Photon flux (15-150 keV) in 1 sec: 6.22601 ( -1.24597 1.25588 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.31222e-07 ( -1.02479e-07 1.02661e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.356 sec. to 1.356 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -1.41417 ( -2.10275 1.45879 )
Epeak [keV] : 76.9629 ( -13.1159 25.0914 )
Norm@50keV : 0.726906 ( -0.726905 4.18154 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 55.05 using 59 PHA bins.
# Reduced chi-squared = 0.9830 for 56 degrees of freedom
# Null hypothesis probability = 5.108573e-01
Photon flux (15-150 keV) in 1 sec: 6.01696 ( -1.2128 1.24083 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.37743e-07 ( -1.06984e-07 1.06998e-07 ) ergs/cm2
Band function
Time interval is from 0.356 sec. to 1.356 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 1.41516 ( -1.17087 2.44817 )
beta : -10.0000 ( 10 20 )
Epeak [keV] : 76.9439 ( -11.9652 25.1077 )
Norm@50keV : 0.727829 ( -0.727829 4.18726 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 55.05 using 59 PHA bins.
# Reduced chi-squared = 1.001 for 55 degrees of freedom
# Null hypothesis probability = 4.727708e-01
Photon flux (15-150 keV) in 1 sec: 6.15780 ( ) 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] : 19.7251 (-3.03505 3.65761)
R^2/D10^2 : 0.353507 (-0.159809 0.271156)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 55.09 using 59 PHA bins.
# Reduced chi-squared = 0.9665 for 57 degrees of freedom
# Null hypothesis probability = 5.471577e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.666e-08 8.075e-09
25- 50 1.316e-07 3.839e-08
50-150 3.787e-07 1.085e-07
15-150 5.370e-07 1.385e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 200.000 (-55.1442 -200)
Norm : 26.9592 (-5.16832 5.16832)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 68.84 using 59 PHA bins.
# Reduced chi-squared = 1.208 for 57 degrees of freedom
# Null hypothesis probability = 1.353641e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 6.717e-08 3.976e-08
25- 50 1.292e-07 7.450e-08
50-150 2.834e-07 1.689e-07
15-150 4.798e-07 2.792e-07
Double BB
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 12.3031 (-17.271 -17.271)
R1^2/D10^2 : 9.04067E-02 (-0.0979905 -0.0979905)
kT2 [keV] : 20.1729 (-20.2006 -20.2006)
R2^2/D10^2 : 0.313186 (-0.308704 0.314869)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 55.09 using 59 PHA bins.
#Fit statistic : Chi-Squared = 55.07 using 59 PHA bins.
# Reduced chi-squared = 1.002 for 55 degrees of freedom
# Reduced chi-squared = 1.001 for 55 degrees of freedom
# Null hypothesis probability = 4.713171e-01
# Null hypothesis probability = 4.718799e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.730e-08 1.232e-05
25- 50 1.324e-07 1.008e-04
50-150 3.787e-07 2.259e-03
15-150 5.384e-07 2.364e-03
Plot creation:
Sun May 12 14:28:49 EDT 2019