batgrbproduct analysis for trigger=958733
batgrbproduct Analysis for Trigger=958733
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): Sat Feb 29 12:52:29 EST 2020
Host Name: bat1
Current Working Dir: /local/data/bat1/prebascript/trigger958733/GCN5_download_cron
======================================================================
Trigger: 00958733 Segment: 000
BAT Trigger Time: 604581305.664 [s; MET]
Trigger Stop: 604581313.856 [s; MET]
UTC: 2020-02-28T11:14:41.151740 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 252.025900508948 Dec: 16.9602927726214 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 7.13
Image Trigger?: NO
Rate S/N Ratio: 9.74679434480896 [ if not an image trigger ]
Image S/N Ratio: 7.13
Flight Position: [ source = BAT ]
RA: 252.025900508948 Dec: 16.9602927726214 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 252.00740815657 Dec: 16.9639697159137 [deg; J2000]
{ 16h 48m 01.8s , +16d 57' 50.3" }
+/- 2.46810577454797 [arcmin] (estimated 90% radius based on SNR)
+/- 0.969282892288848 [arcmin] (formal 1-sigma fit error)
SNR: 8.36755761196647
Angular difference between Flight and Ground position is 1.083962 arcmin
Partial Coding Fraction: 0.3125 [ including projection effects ]
Duration
T90: 7.36799991130829 +/- 1.57555826006172
Measured from: -0.579999923706055
to: 6.78799998760223 [s; relative to TRIGTIME]
T50: 3.76800000667572 +/- 1.59487299974957
Measured from: 1.39600002765656
to: 5.16400003433228 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 1.31599998474121
to: 2.31599998474121 [s; relative to TRIGTIME]
Total Fluence
Measured from: -0.843999981880188
to: 6.96799993515015 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.213577 0.242020 0.087852 0.029574
0.038515 0.035700 0.029309 0.025367 [error]
Peak 0.067324 0.013204 0.018221 0.000925
0.014147 0.012986 0.010706 0.009344 [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 8.36e-08 9.65e-08 8.00e-08 1.12e-07 3.00e-07 3.72e-07 erg/cm2
Error 2.03e-08 1.81e-08 2.77e-08 7.52e-08 6.45e-08 1.10e-07 erg/cm2
Peak flux Power-law 7.92e-01 1.48e-01 1.33e-02 1.30e-03 9.54e-01 9.55e-01 ph/cm2/s
Error 2.80e-01 1.44e-01 4.01e-02 1.35e-02 3.63e-01 3.64e-01 ph/cm2/s
Fluence Cutoff-PL 7.91e-08 1.06e-07 7.38e-08 2.81e-08 2.79e-07 2.87e-07 erg/cm2
Error 2.29e-08 2.63e-08 3.52e-08 7.86e-08 7.26e-08 1.29e-07 erg/cm2
Peak flux Cutoff-PL 7.94e-01 1.32e-01 1.00e-02 8.48e-04 9.37e-01 9.42e-01 ph/cm2/s
Error -------- -------- -------- 1.35e-02 -------- 3.67e-01 ph/cm2/s
Fluence Band -------- -------- -------- -------- -------- -------- erg/cm2
Error -------- -------- -------- -------- -------- -------- erg/cm2
Peak flux Band 4.75e-01 7.10e-03 2.33e-05 7.67e-08 4.82e-01 4.82e-01 ph/cm2/s
Error 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 2.270 0.364 - - 4.05e-03 1.03e-03 57.420 57
CPL 1.430 1.556 26.5 -3.8 1.29e-02 2.25e-01 56.670 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 4.468 2.139 - - 1.02e-03 2.09e-03 42.630 57
CPL 1.869 0.000 1.0 0.0 1.59e-01 0.00e+00 43.260 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 7.812 -0.844 6.968
T90 7.368 -0.580 6.788
T50 3.768 1.396 5.164
Peak 1.000 1.316 2.316
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
252.0074 +16.9640 0.0230 39.3 145.7 0.5786 8.4 TRIG_00958733
------------------------------------------
Foreground time interval of the image:
-0.844 6.968 (delta_t = 7.812 [sec])
Background time interval of the image:
-239.664 -0.844 (delta_t = 238.820 [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 -0.844 sec. to 6.968 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.27003 ( -0.34159 0.387079 )
Norm@50keV : 4.04656E-03 ( -0.00104573 0.00100594 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 57.42 using 59 PHA bins.
# Reduced chi-squared = 1.007 for 57 degrees of freedom
# Null hypothesis probability = 4.596523e-01
Photon flux (15-150 keV) in 7.812 sec: 0.695572 ( -0.126341 0.126416 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.00482e-07 ( -6.33975e-08 6.5599e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.844 sec. to 6.968 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.42999 ( -2.48019 0.631138 )
Epeak [keV] : 26.4898 ( -18.8182 -26.5049 )
Norm@50keV : 1.29444E-02 ( -0.0129664 0.436256 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 56.67 using 59 PHA bins.
# Reduced chi-squared = 1.012 for 56 degrees of freedom
# Null hypothesis probability = 4.496654e-01
Photon flux (15-150 keV) in 7.812 sec: 0.676704 ( -0.131948 0.131616 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.78882e-07 ( -6.75605e-08 7.75435e-08 ) ergs/cm2
Band function
Time interval is from -0.844 sec. to 6.968 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.16153 ( 1.15264 1.15264 )
beta : -2.83372 ( 2.84954 0.857728 )
Epeak [keV] : 28.1910 ( -28.0874 20.1469 )
Norm@50keV : 1.93293E-02 ( -0.02118 3116.17 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 56.48 using 59 PHA bins.
# Reduced chi-squared = 1.027 for 55 degrees of freedom
# Null hypothesis probability = 4.192567e-01
Photon flux (15-150 keV) in 7.812 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] : 8.66659 (-1.57071 1.88822)
R^2/D10^2 : 0.555385 (-0.30493 0.68702)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 60.33 using 59 PHA bins.
# Reduced chi-squared = 1.058 for 57 degrees of freedom
# Null hypothesis probability = 3.564414e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 6.214e-08 2.273e-08
25- 50 1.244e-07 3.840e-08
50-150 4.222e-08 2.216e-08
15-150 2.287e-07 8.324e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 43.8416 (-16.0109 31.6079)
Norm : 4.24639 (-1.23862 1.90534)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 56.68 using 59 PHA bins.
# Reduced chi-squared = 0.9944 for 57 degrees of freedom
# Null hypothesis probability = 4.870297e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 7.839e-08 2.028e-08
25- 50 1.071e-07 2.658e-08
50-150 9.137e-08 5.178e-08
15-150 2.769e-07 7.828e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 2.65717 (-2.50399 40.5781)
R1^2/D10^2 : 51.5742 (-51.1505 303.13)
kT2 [keV] : 10.2266 (-2.38965 -10.2266)
R2^2/D10^2 : 0.255126 (-0.242687 0.323675)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 57.01 using 59 PHA bins.
# Reduced chi-squared = 1.036 for 55 degrees of freedom
# Null hypothesis probability = 4.003861e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 7.679e-08 3.984e-08
25- 50 1.129e-07 6.527e-08
50-150 6.107e-08 3.869e-08
15-150 2.507e-07 1.355e-07
Peak spectrum fit
Power-law model
Time interval is from 1.316 sec. to 2.316 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 4.46781 ( -1.60906 2.66832 )
Norm@50keV : 1.01801E-03 ( -0.00101642 0.0031701 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 42.63 using 59 PHA bins.
# Reduced chi-squared = 0.7478 for 57 degrees of freedom
# Null hypothesis probability = 9.215858e-01
Photon flux (15-150 keV) in 1 sec: 0.954398 ( -0.364546 0.361952 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.21231e-08 ( -1.46172e-08 1.89459e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 1.316 sec. to 2.316 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.86929 ( )
Epeak [keV] : 0.999546 ( )
Norm@50keV : 0.159153 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 43.26 using 59 PHA bins.
# Reduced chi-squared = 0.7725 for 56 degrees of freedom
# Null hypothesis probability = 8.934694e-01
Photon flux (15-150 keV) in 1 sec: 0.936544 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 3.24366e-08 ( -1.49317e-08 1.85972e-08 ) ergs/cm2
Band function
Time interval is from 1.316 sec. to 2.316 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -2.45201 ( 2.45008 0.867045 )
beta : -4.47488 ( -2.67051 1.60895 )
Epeak [keV] : 157.788 ( -157.788 -157.788 )
Norm@50keV : 5.02402 ( -4.99329 555.372 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 42.63 using 59 PHA bins.
# Reduced chi-squared = 0.7750 for 55 degrees of freedom
# Null hypothesis probability = 8.882462e-01
Photon flux (15-150 keV) in 1 sec: 0.481769 ( 6.51823 -0.481769 ) 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] : 2.93667 (-1.16754 1.82046)
R^2/D10^2 : 146.613 (-147.419 5964.1)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 43.96 using 59 PHA bins.
# Reduced chi-squared = 0.7713 for 57 degrees of freedom
# Null hypothesis probability = 8.971221e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.398e-08 1.437e-08
25- 50 3.242e-09 2.283e-09
50-150 4.383e-12 6.075e-12
15-150 2.722e-08 1.646e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 6.42437 (-3.48934 9.73164)
Norm : 94.1812 (-94.4737 1754.45)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 43.36 using 59 PHA bins.
# Reduced chi-squared = 0.7607 for 57 degrees of freedom
# Null hypothesis probability = 9.087334e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.372e-08 1.425e-08
25- 50 5.035e-09 3.661e-09
50-150 8.033e-11 1.078e-10
15-150 2.884e-08 1.782e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 2.73802 (-2.73574 1.65697)
R1^2/D10^2 : 222.255 (-223.917 14201.6)
kT2 [keV] : 32.5135 (-32.4604 -32.4604)
R2^2/D10^2 : 2.92043E-03 (-0.00293416 0.0542083)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 41.33 using 59 PHA bins.
# Reduced chi-squared = 0.7515 for 55 degrees of freedom
# Null hypothesis probability = 9.138873e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.348e-08 1.332e-08
25- 50 5.334e-09 2.913e-09
50-150 2.106e-08 1.873e-08
15-150 4.987e-08 2.684e-08
Plot creation:
Sat Feb 29 12:55:44 EST 2020