batgrbproduct analysis for trigger=976692
batgrbproduct Analysis for Trigger=976692
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 v2.47
Process Start Time (local time): Tue Jun 9 20:39:23 EDT 2020
Host Name: bat1
Current Working Dir: /local/data/bat1/prebascript/trigger976692/GCN5_download_cron
======================================================================
Trigger: 00976692 Segment: 000
BAT Trigger Time: 613330144 [s; MET]
Trigger Stop: 613330208 [s; MET]
UTC: 2020-06-08T17:28:38.919540 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 309.628863589921 Dec: -31.1682990251738 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 8.43
Image Trigger?: YES
Rate S/N Ratio: 0 [ if not an image trigger ]
Image S/N Ratio: 8.43
Flight Position: [ source = BAT ]
RA: 309.628863589921 Dec: -31.1682990251738 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 309.627863837641 Dec: -31.1942708477675 [deg; J2000]
{ 20h 38m 30.7s , -31d 11' 39.4" }
+/- 2.25228724672332 [arcmin] (estimated 90% radius based on SNR)
+/- 0.975331259218946 [arcmin] (formal 1-sigma fit error)
SNR: 9.53608527717122
Angular difference between Flight and Ground position is 1.559154 arcmin
Partial Coding Fraction: 0.5390625 [ including projection effects ]
Duration
T90: 119.167999863625 +/- 34.6561624389093
Measured from: 20.5840001106262
to: 139.751999974251 [s; relative to TRIGTIME]
T50: 50.9439998865128 +/- 16.2561259699168
Measured from: 31.0800001621246
to: 82.0240000486374 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 70.2920000553131
to: 71.2920000553131 [s; relative to TRIGTIME]
Total Fluence
Measured from: 18.0880000591278
to: 147.944000005722 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.946612 1.081332 0.496163 0.087226
0.117928 0.107734 0.090620 0.077767 [error]
Peak 0.036626 0.031176 0.002959 0.019525
0.010589 0.009419 0.008247 0.007061 [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 3.36e-07 4.43e-07 4.30e-07 7.43e-07 1.45e-06 1.95e-06 erg/cm2
Error 5.73e-08 5.37e-08 8.53e-08 2.90e-07 2.02e-07 3.87e-07 erg/cm2
Peak flux Power-law 2.72e-01 2.22e-01 1.23e-01 9.99e-02 6.62e-01 7.18e-01 ph/cm2/s
Error 1.71e-01 8.52e-02 9.79e-02 1.46e-01 2.53e-01 2.68e-01 ph/cm2/s
Fluence Cutoff-PL 2.97e-07 5.19e-07 3.86e-07 9.77e-08 1.28e-06 1.30e-06 erg/cm2
Error 6.63e-08 7.75e-08 1.12e-07 -------- 2.14e-07 2.83e-07 erg/cm2
Peak flux Cutoff-PL 2.76e-01 2.23e-01 1.21e-01 9.58e-02 6.64e-01 7.16e-01 ph/cm2/s
Error 1.70e-01 8.11e-02 7.20e-02 1.45e-01 2.53e-01 2.67e-01 ph/cm2/s
Fluence Band 2.93e-07 5.20e-07 3.79e-07 2.13e-07 1.30e-06 1.41e-06 erg/cm2
Error 6.59e-08 6.85e-08 -------- 4.95e-07 -------- -------- 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 2.045 0.217 - - 1.21e-03 1.78e-04 74.480 57
CPL 0.571 1.245 39.2 8.9 8.78e-03 2.94e-02 68.710 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.855 0.843 - - 4.70e-03 2.09e-03 66.980 57
CPL 2.409 1.796 148.3 0.0 2.44e-03 0.00e+00 66.700 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: 35.008000 sec.
T50 in the 50-300 keV band: 8.512000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 129.856 18.088 147.944
T90 119.168 20.584 139.752
T50 50.944 31.080 82.024
Peak 1.000 70.292 71.292
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
309.6279 -31.1943 0.0201 35.7 -145.3 2.3320 9.5 TRIG_00976692
------------------------------------------
Foreground time interval of the image:
18.088 147.944 (delta_t = 129.856 [sec])
Background time interval of the image:
-239.000 -56.880 (delta_t = 182.120 [sec])
-56.000 18.088 (delta_t = 74.088 [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 18.088 sec. to 147.944 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.04510 ( -0.211653 0.222748 )
Norm@50keV : 1.21027E-03 ( -0.000179797 0.00017645 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 74.48 using 59 PHA bins.
# Reduced chi-squared = 1.307 for 57 degrees of freedom
# Null hypothesis probability = 5.989193e-02
Photon flux (15-150 keV) in 129.9 sec: 0.185410 ( -0.0226352 0.0226612 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.45389e-06 ( -1.99625e-07 2.03505e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from 18.088 sec. to 147.944 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.570947 ( -1.40427 1.08645 )
Epeak [keV] : 39.2482 ( -6.96402 10.8605 )
Norm@50keV : 8.77603E-03 ( -0.00877605 0.0500846 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 68.71 using 59 PHA bins.
# Reduced chi-squared = 1.227 for 56 degrees of freedom
# Null hypothesis probability = 1.184658e-01
Photon flux (15-150 keV) in 129.9 sec: 0.175968 ( -0.02346 0.023588 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.28143e-06 ( -2.01653e-07 2.25848e-07 ) ergs/cm2
Band function
Time interval is from 18.088 sec. to 147.944 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.712968 ( -0.938293 0.673103 )
beta : -3.12433 ( 3.24276 1.1113 )
Epeak [keV] : 39.1099 ( -15.5637 9.74768 )
Norm@50keV : 7.25206E-03 ( -0.00612384 77.1176 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 68.60 using 59 PHA bins.
# Reduced chi-squared = 1.247 for 55 degrees of freedom
# Null hypothesis probability = 1.028699e-01
Photon flux (15-150 keV) in 129.9 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 1.30491e-06 ( 0 0 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 10.0008 (-1.21523 1.38028)
R^2/D10^2 : 8.76169E-02 (-0.0349233 0.0580401)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 74.41 using 59 PHA bins.
# Reduced chi-squared = 1.305 for 57 degrees of freedom
# Null hypothesis probability = 6.056473e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.318e-07 4.306e-08
25- 50 5.765e-07 9.022e-08
50-150 3.010e-07 9.723e-08
15-150 1.109e-06 1.700e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 58.9568 (-16.4408 27.1345)
Norm : 0.987757 (-0.186129 0.223739)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 69.87 using 59 PHA bins.
# Reduced chi-squared = 1.226 for 57 degrees of freedom
# Null hypothesis probability = 1.177279e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.215e-07 5.254e-08
25- 50 4.867e-07 6.937e-08
50-150 5.458e-07 1.660e-07
15-150 1.354e-06 2.387e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 5.18731 (-2.41888 94.5396)
R1^2/D10^2 : 0.544515 (-0.430423 6.61125)
kT2 [keV] : 13.5077 (-3.18353 84.154)
R2^2/D10^2 : 2.05385E-02 (-0.0203132 0.0514045)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 68.47 using 59 PHA bins.
# Reduced chi-squared = 1.245 for 55 degrees of freedom
# Null hypothesis probability = 1.048058e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.019e-07 1.610e-07
25- 50 5.118e-07 2.556e-07
50-150 4.428e-07 2.725e-07
15-150 1.257e-06 6.618e-07
Peak spectrum fit
Power-law model
Time interval is from 70.292 sec. to 71.292 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.85542 ( -0.822515 0.862654 )
Norm@50keV : 4.70215E-03 ( -0.00219362 0.00198693 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 66.98 using 59 PHA bins.
# Reduced chi-squared = 1.175 for 57 degrees of freedom
# Null hypothesis probability = 1.719366e-01
Photon flux (15-150 keV) in 1 sec: 0.662398 ( -0.252872 0.253795 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.32324e-08 ( -1.83288e-08 1.96133e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 70.292 sec. to 71.292 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.40853 ( -3.45466 0.138324 )
Epeak [keV] : 148.289 ( )
Norm@50keV : 2.44274E-03 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 66.70 using 59 PHA bins.
# Reduced chi-squared = 1.191 for 56 degrees of freedom
# Null hypothesis probability = 1.549521e-01
Photon flux (15-150 keV) in 1 sec: 0.663524 ( -0.252693 0.252382 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.27164e-08 ( -1.0234e-08 1.92355e-08 ) ergs/cm2
Band function
Time interval is from 70.292 sec. to 71.292 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 4.97514 ( -4.97514 -4.97514 )
beta : -2.00257 ( -1.52092 0.880856 )
Epeak [keV] : 22.3295 ( -22.3295 63.14 )
Norm@50keV : 1395.53 ( -513.692 1.10111e+07 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 66.47 using 59 PHA bins.
# Reduced chi-squared = 1.209 for 55 degrees of freedom
# Null hypothesis probability = 1.381571e-01
Photon flux (15-150 keV) in 1 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 3.59646e-08 ( 0 0 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 9.36894 (-4.12798 7.11588)
R^2/D10^2 : 0.375178 (-0.368316 3.53695)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 69.78 using 59 PHA bins.
# Reduced chi-squared = 1.224 for 57 degrees of freedom
# Null hypothesis probability = 1.191344e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 6.537e-09 4.204e-09
25- 50 1.478e-08 9.300e-09
50-150 6.366e-09 5.180e-09
15-150 2.768e-08 1.803e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 92.6475 (-93.3127 -93.3127)
Norm : 2.90558 (-1.30054 4.1247)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 67.64 using 59 PHA bins.
# Reduced chi-squared = 1.187 for 57 degrees of freedom
# Null hypothesis probability = 1.581478e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 7.587e-09 4.827e-09
25- 50 1.291e-08 8.155e-09
50-150 2.001e-08 1.697e-08
15-150 4.051e-08 2.852e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 6.73513 (-2.39976 3.82236)
R1^2/D10^2 : 1.25464 (-1.12219 2.078)
kT2 [keV] : 197.003 (-172.835 -197.769)
R2^2/D10^2 : 1.12054E-04 (-7.33513e-05 0.00738078)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 64.49 using 59 PHA bins.
# Reduced chi-squared = 1.173 for 55 degrees of freedom
# Null hypothesis probability = 1.786728e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 8.910e-09 5.960e-09
25- 50 1.233e-08 7.570e-09
50-150 3.081e-08 5.330e-09
15-150 5.205e-08 1.545e-08
Plot creation:
Tue Jun 9 20:43:25 EDT 2020