batgrbproduct analysis for trigger=945521
batgrbproduct Analysis for Trigger=945521
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 Dec 22 20:55:17 EST 2019
Host Name: bat1
Current Working Dir: /local/data/bat1/prebascript/trigger945521/GCN5_download_cron
======================================================================
Trigger: 00945521 Segment: 000
BAT Trigger Time: 598653577.28 [s; MET]
Trigger Stop: 598653578.304 [s; MET]
UTC: 2019-12-21T20:39:13.151900 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 154.832295571442 Dec: -38.141432610349 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 11.67
Image Trigger?: NO
Rate S/N Ratio: 145.168867185771 [ if not an image trigger ]
Image S/N Ratio: 11.67
Flight Position: [ source = BAT ]
RA: 154.832295571442 Dec: -38.141432610349 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 154.830555795377 Dec: -38.1519689950725 [deg; J2000]
{ 10h 19m 19.3s , -38d 09' 07.1" }
+/- 1.14588306093097 [arcmin] (estimated 90% radius based on SNR)
+/- 0.321594426761446 [arcmin] (formal 1-sigma fit error)
SNR: 25.039879688671
Angular difference between Flight and Ground position is 0.637491 arcmin
Partial Coding Fraction: 0.1201172 [ including projection effects ]
Duration
T90: 48 +/- 16
Measured from: -15.2799998521805
to: 32.7200001478195 [s; relative to TRIGTIME]
T50: 16 +/- 16
Measured from: -15.2799998521805
to: 0.720000147819519 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 8.22000002861023
to: 9.22000002861023 [s; relative to TRIGTIME]
Total Fluence
Measured from: -15.2799999713898
to: 96.7200000286102 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 5.108000 9.430897 8.912686 2.931479
0.180369 0.203728 0.195057 0.156618 [error]
Peak 0.149421 0.246408 0.176474 0.057931
0.026706 0.030840 0.026763 0.020410 [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 1.92e-06 4.13e-06 7.00e-06 2.72e-05 1.92e-05 4.03e-05 erg/cm2
Error 1.03e-07 1.30e-07 1.99e-07 1.80e-06 5.10e-07 1.88e-06 erg/cm2
Peak flux Power-law 1.89e+00 1.63e+00 9.58e-01 8.44e-01 4.84e+00 5.32e+00 ph/cm2/s
Error 4.24e-01 2.50e-01 1.93e-01 3.18e-01 7.43e-01 8.04e-01 ph/cm2/s
Fluence Cutoff-PL 1.80e-06 4.19e-06 7.19e-06 2.00e-05 1.90e-05 3.32e-05 erg/cm2
Error 1.32e-07 1.39e-07 2.42e-07 4.46e-06 5.38e-07 4.42e-06 erg/cm2
Peak flux Cutoff-PL 1.59e+00 1.88e+00 1.07e+00 2.87e-01 4.76e+00 4.82e+00 ph/cm2/s
Error 5.14e-01 3.46e-01 2.40e-01 3.38e-01 7.54e-01 8.01e-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 1.240 0.046 - - 1.71e-02 4.39e-04 43.240 57
CPL 0.993 0.185 237.7 261.6 2.19e-02 4.01e-03 37.790 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.766 0.237 - - 3.56e-02 5.78e-03 88.050 57
CPL 0.525 1.273 57.4 50.3 1.61e-01 4.20e-01 84.630 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: 21.504000 sec.
T50 in the 50-300 keV band: 5.312000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 112.000 -15.280 96.720
T90 48.000 -15.280 32.720
T50 16.000 -15.280 0.720
Peak 1.000 8.220 9.220
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
154.8306 -38.1520 0.0076 39.8 119.3 24.4156 25.0 TRIG_00945521
------------------------------------------
Foreground time interval of the image:
-15.280 14.821 (delta_t = 30.101 [sec])
Background time interval of the image:
-239.280 -15.280 (delta_t = 224.000 [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 -15.280 sec. to 96.720 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.23981 ( -0.046159 0.0459601 )
Norm@50keV : 1.71057E-02 ( -0.000438915 0.000438599 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 43.24 using 59 PHA bins.
# Reduced chi-squared = 0.7586 for 57 degrees of freedom
# Null hypothesis probability = 9.108279e-01
Photon flux (15-150 keV) in 112 sec: 2.01984 ( -0.0560952 0.0562124 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.92256e-05 ( -5.10116e-07 5.10272e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -15.280 sec. to 96.720 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.993270 ( -0.188957 0.181305 )
Epeak [keV] : 237.678 ( -77.6443 445.562 )
Norm@50keV : 2.19248E-02 ( -0.00357434 0.00445069 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 37.79 using 59 PHA bins.
# Reduced chi-squared = 0.6748 for 56 degrees of freedom
# Null hypothesis probability = 9.705265e-01
Photon flux (15-150 keV) in 112 sec: 1.99072 ( -0.05952 0.05971 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.90211e-05 ( -5.39392e-07 5.35808e-07 ) ergs/cm2
Band function
Time interval is from -15.280 sec. to 96.720 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 0.893226 ( -1.67778 4.09257 )
beta : -1.31479 ( -0.0983352 0.0641063 )
Epeak [keV] : 43.1691 ( -11.3439 64.0255 )
Norm@50keV : 0.402989 ( -0.402988 189.271 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 32.50 using 59 PHA bins.
# Reduced chi-squared = 0.5909 for 55 degrees of freedom
# Null hypothesis probability = 9.932577e-01
Photon flux (15-150 keV) in 112 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] : 19.9877 ( )
R^2/D10^2 : 9.10108E-02 ( )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 312.50 using 59 PHA bins.
# Reduced chi-squared = 5.4824 for 57 degrees of freedom
# Null hypothesis probability = 6.267312e-37
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 7.852e-07 4.049e-08
25- 50 3.910e-06 1.546e-07
50-150 1.158e-05 4.631e-07
15-150 1.627e-05 4.872e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 199.363 ( )
Norm : 8.63919 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 186.86 using 59 PHA bins.
# Reduced chi-squared = 3.2782 for 57 degrees of freedom
# Null hypothesis probability = 1.007217e-15
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.409e-06 7.336e-08
25- 50 4.635e-06 1.243e-07
50-150 1.016e-05 2.643e-07
15-150 1.721e-05 5.096e-07
Double BB
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 9.05328 (-0.873121 0.94131)
R1^2/D10^2 : 0.756817 (-0.192109 0.277932)
kT2 [keV] : 35.1306 (-3.65752 5.11279)
R2^2/D10^2 : 1.16338E-02 (-0.0041152 0.00521236)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 54.49 using 59 PHA bins.
#Fit statistic : Chi-Squared = 32.99 using 59 PHA bins.
# Reduced chi-squared = 0.9907 for 55 degrees of freedom
# Reduced chi-squared = 0.5997 for 55 degrees of freedom
# Null hypothesis probability = 4.940588e-01
# Null hypothesis probability = 9.919104e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.581e-06 4.316e-07
25- 50 4.023e-06 6.619e-07
50-150 1.226e-05 1.495e-06
15-150 1.786e-05 2.027e-06
Peak spectrum fit
Power-law model
Time interval is from 8.220 sec. to 9.220 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.76563 ( -0.231131 0.243101 )
Norm@50keV : 3.56088E-02 ( -0.00582377 0.00573259 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 88.05 using 59 PHA bins.
# Reduced chi-squared = 1.545 for 57 degrees of freedom
# Null hypothesis probability = 5.189545e-03
Photon flux (15-150 keV) in 1 sec: 4.84296 ( -0.74266 0.743301 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.28301e-07 ( -5.45012e-08 5.48803e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 8.220 sec. to 9.220 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.524820 ( -1.40574 1.14012 )
Epeak [keV] : 57.3694 ( -12.4513 88.1632 )
Norm@50keV : 0.161179 ( -0.161186 0.677911 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 84.63 using 59 PHA bins.
# Reduced chi-squared = 1.511 for 56 degrees of freedom
# Null hypothesis probability = 8.033430e-03
Photon flux (15-150 keV) in 1 sec: 4.75574 ( -0.75569 0.7523 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.15717e-07 ( -5.4984e-08 5.6082e-08 ) ergs/cm2
Band function
Time interval is from 8.220 sec. to 9.220 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.486808 ( -1.01076 2.9256 )
beta : -3.03451 ( 3.01471 1.20976 )
Epeak [keV] : 56.7260 ( -24.2045 25.8742 )
Norm@50keV : 0.169340 ( -0.169465 17.7056 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 84.43 using 59 PHA bins.
# Reduced chi-squared = 1.535 for 55 degrees of freedom
# Null hypothesis probability = 6.542978e-03
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] : 13.3396 (-1.98754 2.20661)
R^2/D10^2 : 0.874743 (-0.38243 0.695488)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 89.70 using 59 PHA bins.
# Reduced chi-squared = 1.574 for 57 degrees of freedom
# Null hypothesis probability = 3.698541e-03
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.299e-08 9.155e-09
25- 50 1.168e-07 2.464e-08
50-150 1.333e-07 3.888e-08
15-150 2.831e-07 5.490e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 99.9061 (-31.9332 -99.95)
Norm : 22.0158 (-4.34831 4.35155)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 85.87 using 59 PHA bins.
# Reduced chi-squared = 1.506 for 57 degrees of freedom
# Null hypothesis probability = 8.020349e-03
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.754e-08 1.169e-08
25- 50 9.948e-08 1.834e-08
50-150 1.611e-07 8.209e-08
15-150 3.181e-07 9.150e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 2.19823 (-2.19184 7.45607)
R1^2/D10^2 : 951.946 (-980.268 -981.615)
kT2 [keV] : 14.5370 (-2.3583 -14.5301)
R2^2/D10^2 : 0.605240 (-0.603526 0.335185)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 84.28 using 59 PHA bins.
# Reduced chi-squared = 1.532 for 55 degrees of freedom
# Null hypothesis probability = 6.745116e-03
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.634e-08 1.541e-08
25- 50 1.046e-07 2.860e-08
50-150 1.471e-07 5.329e-08
15-150 2.981e-07 7.250e-08
Plot creation:
Sun Dec 22 20:58:28 EST 2019