batgrbproduct analysis for trigger=948361
batgrbproduct Analysis for Trigger=948361
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): Fri Jan 10 05:35:21 EST 2020
Host Name: bat1
Current Working Dir: /local/data/bat1/prebascript/trigger948361/GCN5_download_cron
======================================================================
Trigger: 00948361 Segment: 000
BAT Trigger Time: 600227200.448 [s; MET]
Trigger Stop: 600227208.64 [s; MET]
UTC: 2020-01-09T01:46:16.218040 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 307.170901934691 Dec: 53.0032235193214 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 12.72
Image Trigger?: NO
Rate S/N Ratio: 19.5703857907809 [ if not an image trigger ]
Image S/N Ratio: 12.72
Flight Position: [ source = BAT ]
RA: 307.170901934691 Dec: 53.0032235193214 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 307.115530351627 Dec: 52.9882365336681 [deg; J2000]
{ 20h 28m 27.7s , +52d 59' 17.7" }
+/- 1.17999394356625 [arcmin] (estimated 90% radius based on SNR)
+/- 0.459877164915055 [arcmin] (formal 1-sigma fit error)
SNR: 24.0122569766253
Angular difference between Flight and Ground position is 2.192490 arcmin
Partial Coding Fraction: 1 [ including projection effects ]
Duration
T90: 112 +/- 32
Measured from: -31.4479998350143
to: 80.5520001649857 [s; relative to TRIGTIME]
T50: 32 +/- 16
Measured from: -15.4479998350143
to: 16.5520001649857 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 8.05200004577637
to: 9.05200004577637 [s; relative to TRIGTIME]
Total Fluence
Measured from: -31.4479999542236
to: 112.552000045776 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.813580 1.147689 0.980927 0.272848
0.079944 0.082185 0.071997 0.062987 [error]
Peak 0.025081 0.032725 0.029423 -0.001035
0.006881 0.007185 0.006233 0.005544 [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 2.28e-07 4.73e-07 7.65e-07 2.77e-06 2.12e-06 4.24e-06 erg/cm2
Error 3.25e-08 3.91e-08 7.07e-08 5.88e-07 1.75e-07 6.30e-07 erg/cm2
Peak flux Power-law 1.99e-01 2.26e-01 1.83e-01 2.48e-01 6.99e-01 8.57e-01 ph/cm2/s
Error 7.71e-02 5.59e-02 4.92e-02 1.36e-01 1.60e-01 2.02e-01 ph/cm2/s
Fluence Cutoff-PL 2.29e-07 4.74e-07 7.64e-07 2.73e-06 2.11e-06 4.19e-06 erg/cm2
Error 3.27e-08 3.86e-08 7.00e-08 6.66e-07 1.73e-07 6.93e-07 erg/cm2
Peak flux Cutoff-PL 1.68e-01 2.53e-01 1.96e-01 7.97e-02 6.74e-01 6.97e-01 ph/cm2/s
Error 8.79e-02 7.19e-02 5.84e-02 1.59e-01 1.63e-01 2.37e-01 ph/cm2/s
Fluence Band -------- -------- -------- -------- -------- -------- erg/cm2
Error -------- -------- -------- -------- -------- -------- erg/cm2
Peak flux Band 2.37e-01 3.13e-01 2.67e-01 2.42e-01 9.34e-01 1.06e+00 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 1.306 0.137 - - 1.49e-03 1.09e-04 45.420 57
CPL 1.301 0.138 9999.4 0.0 1.49e-03 3.42e-04 45.440 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.301 0.369 - - 5.86e-03 1.33e-03 70.300 57
CPL 0.203 1.730 78.8 466.5 2.19e-02 1.42e-01 68.810 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: 40.768000 sec.
T50 in the 50-300 keV band: 23.040000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 144.000 -31.448 112.552
T90 112.000 -31.448 80.552
T50 32.000 -15.448 16.552
Peak 1.000 8.052 9.052
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
307.1155 +52.9882 0.0080 15.2 -179.9 3.0266 24.0 TRIG_00948361
------------------------------------------
Foreground time interval of the image:
-31.448 49.253 (delta_t = 80.701 [sec])
Background time interval of the image:
-239.448 -31.448 (delta_t = 208.000 [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 -31.448 sec. to 112.552 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.30611 ( -0.137704 0.136647 )
Norm@50keV : 1.48939E-03 ( -0.000109413 0.00010932 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 45.42 using 59 PHA bins.
# Reduced chi-squared = 0.7968 for 57 degrees of freedom
# Null hypothesis probability = 8.654366e-01
Photon flux (15-150 keV) in 144 sec: 0.177890 ( -0.0134912 0.0135369 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.11624e-06 ( -1.74272e-07 1.75442e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -31.448 sec. to 112.552 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.30136 ( -0.137621 0.138597 )
Epeak [keV] : 9999.36 ( -9999.36 -9999.36 )
Norm@50keV : 1.49289E-03 ( -0.000109783 0.000574356 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 45.44 using 59 PHA bins.
# Reduced chi-squared = 0.8114 for 56 degrees of freedom
# Null hypothesis probability = 8.424154e-01
Photon flux (15-150 keV) in 144 sec: 0.177900 ( -0.013529 0.013452 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.11327e-06 ( -1.71173e-07 1.74787e-07 ) ergs/cm2
Band function
Time interval is from -31.448 sec. to 112.552 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.00182 ( 1.00044 1.00044 )
beta : -1.30658 ( 1.30654 0.138186 )
Epeak [keV] : 56.5805 ( -56.993 -56.993 )
Norm@50keV : 2.79295E-03 ( -0.00119814 135309 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 45.41 using 59 PHA bins.
# Reduced chi-squared = 0.8257 for 55 degrees of freedom
# Null hypothesis probability = 8.182704e-01
Photon flux (15-150 keV) in 144 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] : 18.0675 (-1.94529 2.26762)
R^2/D10^2 : 1.07321E-02 (-0.00347479 0.005021)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 101.11 using 59 PHA bins.
# Reduced chi-squared = 1.7739 for 57 degrees of freedom
# Null hypothesis probability = 2.891308e-04
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.009e-07 1.547e-08
25- 50 4.679e-07 5.479e-08
50-150 1.110e-06 1.519e-07
15-150 1.678e-06 1.706e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 200.000 (-21.7144 -200)
Norm : 0.735968 (-0.0545318 0.0545318)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 57.06 using 59 PHA bins.
# Reduced chi-squared = 1.001 for 57 degrees of freedom
# Null hypothesis probability = 4.729803e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.640e-07 2.160e-08
25- 50 5.078e-07 1.151e-07
50-150 1.114e-06 3.589e-07
15-150 1.885e-06 4.580e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 6.96263 (-1.67132 2.02791)
R1^2/D10^2 : 0.180502 (-0.103096 0.310651)
kT2 [keV] : 32.9073 (-7.28903 15.9005)
R2^2/D10^2 : 1.31527E-03 (-0.000896652 0.00166173)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 46.95 using 59 PHA bins.
# Reduced chi-squared = 0.8536 for 55 degrees of freedom
# Null hypothesis probability = 7.716626e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.316e-07 7.513e-08
25- 50 4.663e-07 1.274e-07
50-150 1.464e-06 5.653e-07
15-150 2.162e-06 6.264e-07
Peak spectrum fit
Power-law model
Time interval is from 8.052 sec. to 9.052 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.30095 ( -0.374319 0.364464 )
Norm@50keV : 5.85906E-03 ( -0.00132784 0.00132431 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 70.30 using 59 PHA bins.
# Reduced chi-squared = 1.233 for 57 degrees of freedom
# Null hypothesis probability = 1.110107e-01
Photon flux (15-150 keV) in 1 sec: 0.699129 ( -0.159353 0.159761 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.78837e-08 ( -1.43938e-08 1.47339e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 8.052 sec. to 9.052 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.203057 ( -2.19536 1.26483 )
Epeak [keV] : 78.7610 ( -28.2643 904.708 )
Norm@50keV : 2.19282E-02 ( -0.0219266 0.262172 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 68.81 using 59 PHA bins.
# Reduced chi-squared = 1.229 for 56 degrees of freedom
# Null hypothesis probability = 1.169117e-01
Photon flux (15-150 keV) in 1 sec: 0.673534 ( -0.163068 0.163767 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.26314e-08 ( -1.52852e-08 1.64633e-08 ) ergs/cm2
Band function
Time interval is from 8.052 sec. to 9.052 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 4.95578 ( -5.69148 -4.95578 )
beta : -1.59003 ( -0.692815 0.478169 )
Epeak [keV] : 30.3624 ( -9.71597 20.449 )
Norm@50keV : 170.871 ( -37.433 4384.49 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 67.50 using 59 PHA bins.
# Reduced chi-squared = 1.227 for 55 degrees of freedom
# Null hypothesis probability = 1.200373e-01
Photon flux (15-150 keV) in 1 sec: 0.933780 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 5.39217e-08 ( 0 0 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 15.6953 (-3.63456 5.15254)
R^2/D10^2 : 7.28662E-02 (-0.0457223 0.108582)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 70.63 using 59 PHA bins.
# Reduced chi-squared = 1.239 for 57 degrees of freedom
# Null hypothesis probability = 1.058886e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.727e-09 1.873e-09
25- 50 1.542e-08 5.967e-09
50-150 2.636e-08 1.166e-08
15-150 4.551e-08 1.850e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 199.360 (-95.9423 -199.362)
Norm : 2.89636 (-0.652994 0.654408)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 70.74 using 59 PHA bins.
# Reduced chi-squared = 1.241 for 57 degrees of freedom
# Null hypothesis probability = 1.043253e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 7.212e-09 4.341e-09
25- 50 1.387e-08 8.155e-09
50-150 3.043e-08 1.794e-08
15-150 5.151e-08 3.089e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 25.8855 (-25.1217 -25.1217)
R1^2/D10^2 : 9.46851E-03 (-0.0107592 0.0948461)
kT2 [keV] : 8.57461 (-8.34964 -8.34964)
R2^2/D10^2 : 0.316654 (-0.335538 -0.335538)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 68.36 using 59 PHA bins.
# Reduced chi-squared = 1.243 for 55 degrees of freedom
# Null hypothesis probability = 1.063806e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.493e-09 3.264e-09
25- 50 1.492e-08 8.440e-09
50-150 3.369e-08 1.918e-08
15-150 5.411e-08 2.715e-08
Plot creation:
Fri Jan 10 05:39:16 EST 2020