batgrbproduct analysis for trigger=952791
batgrbproduct Analysis for Trigger=952791
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 Jan 29 08:48:41 EST 2020
Host Name: bat1
Current Working Dir: /local/data/bat1/prebascript/trigger952791/batgroup_hand_proc
======================================================================
Trigger: 00952791 Segment: 000
BAT Trigger Time: 601829096 [s; MET]
Trigger Stop: 601829160 [s; MET]
UTC: 2020-01-27T14:44:31.666360 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 295.204508762955 Dec: 44.9096354629614 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 12.94
Image Trigger?: YES
Rate S/N Ratio: 0 [ if not an image trigger ]
Image S/N Ratio: 12.94
Flight Position: [ source = BAT ]
RA: 295.204508762955 Dec: 44.9096354629614 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 295.205846830294 Dec: 44.9343114412103 [deg; J2000]
{ 19h 40m 49.4s , +44d 56' 03.5" }
+/- 2.42447716046158 [arcmin] (estimated 90% radius based on SNR)
+/- 1.06514818845332 [arcmin] (formal 1-sigma fit error)
SNR: 8.58349098501869
Angular difference between Flight and Ground position is 1.481650 arcmin
Partial Coding Fraction: 0.5078125 [ including projection effects ]
Duration
T90: 216.880000114441 +/- 23.4860435994525
Measured from: -138.552000045776
to: 78.3280000686646 [s; relative to TRIGTIME]
T50: 89.9359999895096 +/- 19.9657706686722
Measured from: -45.2879999876022
to: 44.6480000019073 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 41.8040000200272
to: 42.8040000200272 [s; relative to TRIGTIME]
Total Fluence
Measured from: -144.215999960899
to: 92.9680000543594 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 1.057442 1.429668 1.057487 0.344862
0.132459 0.137447 0.122887 0.114360 [error]
Peak 0.006229 0.041692 0.031601 -0.006754
0.009011 0.009123 0.008086 0.007416 [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 3.73e-07 6.31e-07 8.13e-07 2.11e-06 2.40e-06 3.93e-06 erg/cm2
Error 6.54e-08 6.83e-08 1.24e-07 6.85e-07 2.93e-07 7.89e-07 erg/cm2
Peak flux Power-law 1.97e-01 2.30e-01 1.94e-01 2.76e-01 7.20e-01 8.97e-01 ph/cm2/s
Error 1.01e-01 7.85e-02 6.32e-02 1.75e-01 2.22e-01 2.73e-01 ph/cm2/s
Fluence Cutoff-PL 3.73e-07 6.32e-07 8.13e-07 2.09e-06 2.40e-06 3.90e-06 erg/cm2
Error 6.75e-08 7.31e-08 1.25e-07 1.04e-06 3.01e-07 8.99e-07 erg/cm2
Peak flux Cutoff-PL 1.01e-01 2.78e-01 2.41e-01 3.96e-02 6.56e-01 6.60e-01 ph/cm2/s
Error 1.09e-01 1.08e-01 8.86e-02 -------- 2.13e-01 2.20e-01 ph/cm2/s
Fluence Band -------- -------- -------- -------- -------- -------- erg/cm2
Error -------- -------- -------- -------- -------- -------- erg/cm2
Peak flux Band 1.10e-01 2.77e-01 2.41e-01 4.45e-02 6.68e-01 6.72e-01 ph/cm2/s
Error 1.08e-01 -------- -------- -------- 2.10e-01 -------- ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.635 0.194 - - 1.09e-03 1.23e-04 46.730 57
CPL 1.640 0.195 9999.4 -0.0 1.08e-03 8.45e-04 46.740 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.243 0.447 - - 6.08e-03 1.82e-03 50.630 57
CPL -1.810 3.220 64.9 29.7 1.75e-01 1.09e+01 44.410 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: 253.312000 sec.
T50 in the 50-300 keV band: 162.176000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 237.184 -144.216 92.968
T90 216.880 -138.552 78.328
T50 89.936 -45.288 44.648
Peak 1.000 41.804 42.804
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
295.2058 +44.9343 0.0224 37.5 -38.2 3.7006 8.6 TRIG_00952791
------------------------------------------
Foreground time interval of the image:
-144.216 72.901 (delta_t = 217.117 [sec])
Background time interval of the image:
-365.699 -346.468 (delta_t = 19.232 [sec])
-239.000 -144.216 (delta_t = 94.784 [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 -144.216 sec. to 92.968 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.63505 ( -0.192292 0.195878 )
Norm@50keV : 1.08514E-03 ( -0.000124027 0.000122325 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 46.73 using 59 PHA bins.
# Reduced chi-squared = 0.8198 for 57 degrees of freedom
# Null hypothesis probability = 8.322577e-01
Photon flux (15-150 keV) in 237.2 sec: 0.141002 ( -0.0151881 0.0152119 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.39757e-06 ( -2.91448e-07 2.95077e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -144.216 sec. to 92.968 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.63979 ( -0.197403 0.193093 )
Epeak [keV] : 9999.36 ( -9999.35 -9999.36 )
Norm@50keV : 1.08303E-03 ( -0.000437149 0.00125238 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 46.74 using 59 PHA bins.
# Reduced chi-squared = 0.8346 for 56 degrees of freedom
# Null hypothesis probability = 8.064457e-01
Photon flux (15-150 keV) in 237.2 sec: 0.141027 ( -0.015345 0.015137 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.39657e-06 ( -3.07252e-07 2.94674e-07 ) ergs/cm2
Band function
Time interval is from -144.216 sec. to 92.968 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 4.72493 ( -4.72493 -4.72493 )
beta : -1.68709 ( -0.224939 0.209976 )
Epeak [keV] : 21.6434 ( -21.6434 6.16446 )
Norm@50keV : 193.464 ( -20.426 758326 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 46.41 using 59 PHA bins.
# Reduced chi-squared = 0.8439 for 55 degrees of freedom
# Null hypothesis probability = 7.884910e-01
Photon flux (15-150 keV) in 237.2 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] : 13.1335 (-1.9651 2.35527)
R^2/D10^2 : 2.41838E-02 (-0.0107648 0.0193711)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 76.51 using 59 PHA bins.
# Reduced chi-squared = 1.342 for 57 degrees of freedom
# Null hypothesis probability = 4.328612e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.098e-07 4.447e-08
25- 50 7.306e-07 1.077e-07
50-150 8.015e-07 1.883e-07
15-150 1.742e-06 2.621e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 164.097 (-66.4332 -164.277)
Norm : 0.574304 (-0.0667079 0.0796206)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 47.79 using 59 PHA bins.
# Reduced chi-squared = 0.8384 for 57 degrees of freedom
# Null hypothesis probability = 8.025141e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.470e-07 1.179e-07
25- 50 6.513e-07 3.452e-07
50-150 1.333e-06 7.518e-07
15-150 2.331e-06 1.264e-06
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 6.49743 (-1.56395 1.88513)
R1^2/D10^2 : 0.226438 (-0.133191 0.216337)
kT2 [keV] : 28.1146 (-7.85561 20.5561)
R2^2/D10^2 : 1.30508E-03 (-0.00105537 0.00286522)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 45.91 using 59 PHA bins.
# Reduced chi-squared = 0.8346 for 55 degrees of freedom
# Null hypothesis probability = 8.038968e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.747e-07 1.878e-07
25- 50 6.341e-07 2.556e-07
50-150 1.413e-06 7.507e-07
15-150 2.422e-06 9.348e-07
Peak spectrum fit
Power-law model
Time interval is from 41.804 sec. to 42.804 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.24338 ( -0.457721 0.436785 )
Norm@50keV : 6.08493E-03 ( -0.00181806 0.00181629 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 50.63 using 59 PHA bins.
# Reduced chi-squared = 0.8883 for 57 degrees of freedom
# Null hypothesis probability = 7.113104e-01
Photon flux (15-150 keV) in 1 sec: 0.719648 ( -0.220215 0.223991 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.09482e-08 ( -1.89551e-08 1.93445e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 41.804 sec. to 42.804 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -1.80952 ( -4.17667 2.26235 )
Epeak [keV] : 64.8987 ( -16.6202 42.8542 )
Norm@50keV : 0.174537 ( -0.175783 21.6405 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 44.41 using 59 PHA bins.
# Reduced chi-squared = 0.7931 for 56 degrees of freedom
# Null hypothesis probability = 8.679914e-01
Photon flux (15-150 keV) in 1 sec: 0.655952 ( -0.205934 0.219869 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.28941e-08 ( -1.7859e-08 1.9739e-08 ) ergs/cm2
Band function
Time interval is from 41.804 sec. to 42.804 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 1.72602 ( -1.35219 -0.659217 )
beta : -10.0000 ( 10 4.9738e-14 )
Epeak [keV] : 65.4448 ( -16.8763 42.0794 )
Norm@50keV : 0.158791 ( -0.158798 6.96411 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 44.42 using 59 PHA bins.
# Reduced chi-squared = 0.8075 for 55 degrees of freedom
# Null hypothesis probability = 8.455838e-01
Photon flux (15-150 keV) in 1 sec: 0.668209 ( 6.33179 -0.217493 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.27724e-08 ( -5.27654e-08 -1.77187e-08 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 17.1043 (-4.13274 5.95118)
R^2/D10^2 : 6.14130E-02 (-0.0398439 0.0987126)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 44.55 using 59 PHA bins.
# Reduced chi-squared = 0.7815 for 57 degrees of freedom
# Null hypothesis probability = 8.849790e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.653e-09 2.282e-09
25- 50 1.624e-08 9.338e-09
50-150 3.399e-08 2.103e-08
15-150 5.389e-08 2.847e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 199.363 (-106.356 -199.363)
Norm : 3.06969 (-0.916003 0.916034)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 50.64 using 59 PHA bins.
# Reduced chi-squared = 0.8884 for 57 degrees of freedom
# Null hypothesis probability = 7.110095e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 7.644e-09 4.662e-09
25- 50 1.470e-08 8.785e-09
50-150 3.225e-08 1.999e-08
15-150 5.460e-08 3.325e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 15.3345 (-15.5178 -15.5178)
R1^2/D10^2 : 1.31149E-02 (-0.0101907 -0.0101907)
kT2 [keV] : 17.4250 (-17.1675 -17.1675)
R2^2/D10^2 : 4.91851E-02 (-0.051993 -0.051993)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 44.55 using 59 PHA bins.
# Reduced chi-squared = 0.8100 for 55 degrees of freedom
# Null hypothesis probability = 8.420785e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.663e-09 2.006e-05
25- 50 1.623e-08 1.445e-04
50-150 3.398e-08 4.325e-03
15-150 5.387e-08 4.705e-03
Plot creation:
Wed Jan 29 08:56:24 EST 2020