batgrbproduct analysis for trigger=956824
batgrbproduct Analysis for Trigger=956824
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 Feb 17 19:10:26 EST 2020
Host Name: bat1
Current Working Dir: /local/data/bat1/prebascript/trigger956824/GCN5_download_cron
======================================================================
Trigger: 00956824 Segment: 000
BAT Trigger Time: 603552778.304 [s; MET]
Trigger Stop: 603552778.816 [s; MET]
UTC: 2020-02-16T13:32:33.858540 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 160.460729941118 Dec: 19.4541045214607 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 8.23
Image Trigger?: NO
Rate S/N Ratio: 15.1657508881031 [ if not an image trigger ]
Image S/N Ratio: 8.23
Flight Position: [ source = BAT ]
RA: 160.460729941118 Dec: 19.4541045214607 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 160.451726665618 Dec: 19.4681895115282 [deg; J2000]
{ 10h 41m 48.4s , +19d 28' 05.5" }
+/- 0.946105113953137 [arcmin] (estimated 90% radius based on SNR)
+/- 0.280409828880332 [arcmin] (formal 1-sigma fit error)
SNR: 32.9223388117391
Angular difference between Flight and Ground position is 0.986719 arcmin
Partial Coding Fraction: 0.84375 [ including projection effects ]
Duration
T90: 81.2760000228882 +/- 13.0037268158785
Measured from: 0.552000045776367
to: 81.8280000686646 [s; relative to TRIGTIME]
T50: 43.444000005722 +/- 4.76759733387927
Measured from: 4.2720000743866
to: 47.7160000801086 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 2.80400002002716
to: 3.80400002002716 [s; relative to TRIGTIME]
Total Fluence
Measured from: -0.720000028610229
to: 100.332000017166 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 1.049251 1.333384 0.663566 0.093402
0.058001 0.060202 0.051375 0.043223 [error]
Peak 0.039484 0.075588 0.064275 0.013461
0.006655 0.007643 0.006608 0.004939 [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 3.57e-07 5.15e-07 5.52e-07 1.10e-06 1.76e-06 2.52e-06 erg/cm2
Error 3.07e-08 2.93e-08 4.95e-08 1.99e-07 1.15e-07 2.48e-07 erg/cm2
Peak flux Power-law 4.54e-01 5.00e-01 3.92e-01 5.07e-01 1.54e+00 1.85e+00 ph/cm2/s
Error 8.45e-02 5.99e-02 5.16e-02 1.32e-01 1.72e-01 2.11e-01 ph/cm2/s
Fluence Cutoff-PL 3.14e-07 5.76e-07 5.37e-07 2.45e-07 1.60e-06 1.67e-06 erg/cm2
Error 3.59e-08 4.00e-08 5.92e-08 1.55e-07 1.29e-07 2.00e-07 erg/cm2
Peak flux Cutoff-PL 3.63e-01 5.61e-01 4.38e-01 1.71e-01 1.48e+00 1.53e+00 ph/cm2/s
Error 1.02e-01 7.63e-02 6.37e-02 1.33e-01 1.76e-01 2.11e-01 ph/cm2/s
Fluence Band 3.12e-07 5.72e-07 5.39e-07 2.91e-07 1.60e-06 1.72e-06 erg/cm2
Error 3.52e-08 -------- -------- -------- -------- -------- 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 1.900 0.104 - - 1.91e-03 1.26e-04 65.470 57
CPL 0.810 0.521 47.6 6.6 7.67e-03 5.68e-03 48.830 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.349 0.174 - - 1.27e-02 1.41e-03 59.390 57
CPL 0.118 0.908 77.7 34.9 5.26e-02 6.89e-02 52.310 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: 9.152000 sec.
T50 in the 50-300 keV band: 4.032000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 101.052 -0.720 100.332
T90 81.276 0.552 81.828
T50 43.444 4.272 47.716
Peak 1.000 2.804 3.804
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
160.4517 +19.4682 0.0058 23.3 30.0 1.3412 32.9 TRIG_00956824
------------------------------------------
Foreground time interval of the image:
-0.720 7.797 (delta_t = 8.517 [sec])
Background time interval of the image:
-239.304 -84.684 (delta_t = 154.620 [sec])
-83.304 -0.720 (delta_t = 82.584 [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
Multiple GTIs in the spectrum
tstart tstop
-0.720000 92.996000
93.696000 100.332000
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.89968 ( -0.10246 0.10476 )
Norm@50keV : 1.91089E-03 ( -0.000126499 0.00012536 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 65.47 using 59 PHA bins.
# Reduced chi-squared = 1.149 for 57 degrees of freedom
# Null hypothesis probability = 2.063960e-01
Photon flux (15-150 keV) in 100.4 sec: 0.274196 ( -0.0158466 0.0158602 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.76385e-06 ( -1.14909e-07 1.15939e-07 ) ergs/cm2
Cutoff power-law model
Multiple GTIs in the spectrum
tstart tstop
-0.720000 92.996000
93.696000 100.332000
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.809977 ( -0.552743 0.488516 )
Epeak [keV] : 47.6227 ( -5.43166 7.835 )
Norm@50keV : 7.67464E-03 ( -0.00351982 0.00784101 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 48.83 using 59 PHA bins.
# Reduced chi-squared = 0.8720 for 56 degrees of freedom
# Null hypothesis probability = 7.404346e-01
Photon flux (15-150 keV) in 100.4 sec: 0.260709 ( -0.016755 0.016782 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.59842e-06 ( -1.26775e-07 1.31283e-07 ) ergs/cm2
Band function
Multiple GTIs in the spectrum
tstart tstop
-0.720000 92.996000
93.696000 100.332000
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.809853 ( -0.40545 0.652773 )
beta : -10.0000 ( 10 1.77636e-15 )
Epeak [keV] : 47.6127 ( -5.43069 7.82945 )
Norm@50keV : 7.67579E-03 ( -0.00352023 0.00784523 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 48.83 using 59 PHA bins.
# Reduced chi-squared = 0.8879 for 55 degrees of freedom
# Null hypothesis probability = 7.079042e-01
Photon flux (15-150 keV) in 100.4 sec: 0.373237 ( 6.62676 -0.022099 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.5984e-06 ( 0 0 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 11.1108 (-0.698196 0.748211)
R^2/D10^2 : 8.67663E-02 (-0.0190988 0.0243497)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 83.00 using 59 PHA bins.
# Reduced chi-squared = 1.456 for 57 degrees of freedom
# Null hypothesis probability = 1.387385e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.251e-07 2.209e-08
25- 50 6.448e-07 4.172e-08
50-150 4.531e-07 6.149e-08
15-150 1.323e-06 8.936e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 78.5514 (-13.2482 17.8836)
Norm : 1.29710 (-0.112246 0.125106)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 51.59 using 59 PHA bins.
# Reduced chi-squared = 0.9051 for 57 degrees of freedom
# Null hypothesis probability = 6.775603e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.375e-07 2.781e-08
25- 50 5.531e-07 3.514e-08
50-150 7.712e-07 1.184e-07
15-150 1.662e-06 1.270e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 6.08503 (-1.55192 1.71546)
R1^2/D10^2 : 0.468435 (-0.245244 0.749961)
kT2 [keV] : 16.8770 (-2.90561 5.51303)
R2^2/D10^2 : 1.28337E-02 (-0.00926352 0.0174422)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 49.23 using 59 PHA bins.
# Reduced chi-squared = 0.8950 for 55 degrees of freedom
# Null hypothesis probability = 6.938673e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.109e-07 9.141e-08
25- 50 5.721e-07 1.505e-07
50-150 6.920e-07 2.897e-07
15-150 1.575e-06 4.553e-07
Peak spectrum fit
Power-law model
Time interval is from 2.804 sec. to 3.804 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.34950 ( -0.173603 0.173758 )
Norm@50keV : 1.27460E-02 ( -0.00141603 0.00141378 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 59.39 using 59 PHA bins.
# Reduced chi-squared = 1.042 for 57 degrees of freedom
# Null hypothesis probability = 3.886403e-01
Photon flux (15-150 keV) in 1 sec: 1.53538 ( -0.171822 0.171998 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.24503e-07 ( -1.5163e-08 1.52751e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 2.804 sec. to 3.804 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.118260 ( -0.997358 0.818952 )
Epeak [keV] : 77.7194 ( -15.6728 54.1829 )
Norm@50keV : 5.26213E-02 ( -0.0316641 0.106223 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 52.31 using 59 PHA bins.
# Reduced chi-squared = 0.9340 for 56 degrees of freedom
# Null hypothesis probability = 6.155189e-01
Photon flux (15-150 keV) in 1 sec: 1.48438 ( -0.17621 0.17594 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.16402e-07 ( -1.5981e-08 1.6284e-08 ) ergs/cm2
Band function
Time interval is from 2.804 sec. to 3.804 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.104808 ( -0.810384 3.38174 )
beta : -2.72759 ( 2.48357 0.971348 )
Epeak [keV] : 77.4575 ( -37.0808 52.5366 )
Norm@50keV : 5.34071E-02 ( -0.0348004 7.13634 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 52.23 using 59 PHA bins.
# Reduced chi-squared = 0.9495 for 55 degrees of freedom
# Null hypothesis probability = 5.813222e-01
Photon flux (15-150 keV) in 1 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 1.18445e-07 ( 0 0 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 16.2929 (-1.84443 2.12632)
R^2/D10^2 : 0.144154 (-0.0502961 0.0743305)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 58.32 using 59 PHA bins.
# Reduced chi-squared = 1.023 for 57 degrees of freedom
# Null hypothesis probability = 4.266296e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 7.879e-09 1.662e-09
25- 50 3.367e-08 5.225e-09
50-150 6.289e-08 1.371e-08
15-150 1.044e-07 1.468e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 200.000 (-44.467 -200)
Norm : 6.38520 (-0.703581 0.703581)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 59.97 using 59 PHA bins.
# Reduced chi-squared = 1.052 for 57 degrees of freedom
# Null hypothesis probability = 3.686649e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.590e-08 8.860e-09
25- 50 3.059e-08 1.674e-08
50-150 6.708e-08 3.701e-08
15-150 1.136e-07 6.245e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 7.10907 (-4.15343 -7.10906)
R1^2/D10^2 : 0.889239 (-0.701085 23.9139)
kT2 [keV] : 20.7216 (-4.3378 -20.7216)
R2^2/D10^2 : 5.22788E-02 (-0.0521966 0.0827381)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 52.27 using 59 PHA bins.
# Reduced chi-squared = 0.9504 for 55 degrees of freedom
# Null hypothesis probability = 5.794500e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.160e-08 6.350e-09
25- 50 3.209e-08 1.642e-08
50-150 7.130e-08 3.921e-08
15-150 1.150e-07 6.055e-08
Plot creation:
Mon Feb 17 19:13:24 EST 2020