batgrbproduct analysis for trigger=974827
batgrbproduct Analysis for Trigger=974827
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): Fri May 29 15:07:14 EDT 2020
Host Name: bat1
Current Working Dir: /local/data/bat1/prebascript/trigger974827/GCN5_download_cron
======================================================================
Trigger: 00974827 Segment: 000
BAT Trigger Time: 612354468.864 [s; MET]
Trigger Stop: 612354469.376 [s; MET]
UTC: 2020-05-28T10:27:23.846900 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 176.636774868885 Dec: 58.1471189930449 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 9.17
Image Trigger?: NO
Rate S/N Ratio: 15.3948043183407 [ if not an image trigger ]
Image S/N Ratio: 9.17
Flight Position: [ source = BAT ]
RA: 176.636774868885 Dec: 58.1471189930449 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 176.636226360115 Dec: 58.1851095524819 [deg; J2000]
{ 11h 46m 32.7s , +58d 11' 06.4" }
+/- 0.698407297994555 [arcmin] (estimated 90% radius based on SNR)
+/- 0.221656484252238 [arcmin] (formal 1-sigma fit error)
SNR: 50.7949034004486
Angular difference between Flight and Ground position is 2.279500 arcmin
Partial Coding Fraction: 0.625 [ including projection effects ]
Duration
T90: 59.9719998836517 +/- 1.91895389624551
Measured from: 4.74400019645691
to: 64.7160000801086 [s; relative to TRIGTIME]
T50: 24.6440000534058 +/- 0.41011214584303
Measured from: 28.0200001001358
to: 52.6640001535416 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 33.8159999847412
to: 34.8159999847412 [s; relative to TRIGTIME]
Total Fluence
Measured from: -0.73199999332428
to: 132.296000003815 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 12.545143 13.077396 6.713672 0.945545
0.091588 0.093884 0.077318 0.059472 [error]
Peak 0.611336 0.765591 0.515811 0.098983
0.013945 0.015557 0.013304 0.007427 [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 4.60e-06 5.73e-06 5.20e-06 8.20e-06 1.83e-05 2.37e-05 erg/cm2
Error 1.52e-07 1.07e-07 1.02e-07 3.67e-07 2.93e-07 4.30e-07 erg/cm2
Peak flux Power-law 6.71e+00 5.89e+00 3.55e+00 3.23e+00 1.75e+01 1.94e+01 ph/cm2/s
Error 3.37e-01 1.77e-01 1.17e-01 2.22e-01 5.21e-01 5.23e-01 ph/cm2/s
Fluence Cutoff-PL 4.01e-06 5.83e-06 5.38e-06 4.75e-06 1.76e-05 2.00e-05 erg/cm2
Error 2.05e-07 1.14e-07 1.15e-07 6.43e-07 3.48e-07 7.71e-07 erg/cm2
Peak flux Cutoff-PL 5.90e+00 6.06e+00 3.73e+00 2.00e+00 1.69e+01 1.77e+01 ph/cm2/s
Error 4.37e-01 1.94e-01 1.39e-01 3.64e-01 5.71e-01 7.19e-01 ph/cm2/s
Fluence Band 3.97e-06 5.80e-06 5.37e-06 4.77e-06 1.76e-05 2.00e-05 erg/cm2
Error -------- 1.08e-07 1.06e-07 -------- -------- -------- erg/cm2
Peak flux Band 5.80e+00 6.10e+00 3.70e+00 2.44e+00 1.68e+01 1.80e+01 ph/cm2/s
Error 4.79e-01 2.08e-01 1.51e-01 -------- 5.88e-01 -------- ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 2.141 0.031 - - 1.48e-02 2.33e-04 67.920 57
CPL 1.623 0.142 39.6 5.6 2.53e-02 3.67e-03 25.170 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.731 0.048 - - 1.31e-01 3.51e-03 56.340 57
CPL 1.197 0.215 80.7 14.2 2.32e-01 5.35e-02 36.280 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: 56.512000 sec.
T50 in the 50-300 keV band: 22.080000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 133.028 -0.732 132.296
T90 59.972 4.744 64.716
T50 24.644 28.020 52.664
Peak 1.000 33.816 34.816
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
176.6362 +58.1851 0.0038 27.7 -131.9 3.8426 50.8 TRIG_00974827
------------------------------------------
Foreground time interval of the image:
-0.732 10.237 (delta_t = 10.969 [sec])
Background time interval of the image:
-239.864 -225.544 (delta_t = 14.320 [sec])
-223.864 -73.074 (delta_t = 150.790 [sec])
-71.864 -64.114 (delta_t = 7.750 [sec])
-62.864 -0.732 (delta_t = 62.132 [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 -0.732 sec. to 132.296 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.14069 ( -0.0314255 0.0314739 )
Norm@50keV : 1.47839E-02 ( -0.000233047 0.000233034 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 67.92 using 59 PHA bins.
# Reduced chi-squared = 1.192 for 57 degrees of freedom
# Null hypothesis probability = 1.524927e-01
Photon flux (15-150 keV) in 133 sec: 2.37372 ( -0.0514756 0.0518329 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.83473e-05 ( -2.92894e-07 2.93003e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.732 sec. to 132.296 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.62340 ( -0.143706 0.139652 )
Epeak [keV] : 39.6205 ( -6.57815 4.52695 )
Norm@50keV : 2.53234E-02 ( -0.00335151 0.00398703 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 25.17 using 59 PHA bins.
# Reduced chi-squared = 0.4494 for 56 degrees of freedom
# Null hypothesis probability = 9.998783e-01
Photon flux (15-150 keV) in 133 sec: 2.22515 ( -0.0617 0.06244 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.75946e-05 ( -3.48194e-07 3.48726e-07 ) ergs/cm2
Band function
Time interval is from -0.732 sec. to 132.296 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.62335 ( -0.145317 0.0956834 )
beta : -10.0000 ( 10 1.77636e-15 )
Epeak [keV] : 39.6141 ( -6.57432 4.52504 )
Norm@50keV : 2.53197E-02 ( -0.00334901 0.00398675 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 25.17 using 59 PHA bins.
# Reduced chi-squared = 0.4576 for 55 degrees of freedom
# Null hypothesis probability = 9.998153e-01
Photon flux (15-150 keV) in 133 sec: 2.23534 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 1.75704e-05 ( 0 0 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 13.4617 ( )
R^2/D10^2 : 0.300323 ( )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 787.52 using 59 PHA bins.
# Reduced chi-squared = 13.816 for 57 degrees of freedom
# Null hypothesis probability = 4.293363e-129
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.533e-06 5.387e-08
25- 50 5.480e-06 1.210e-07
50-150 6.404e-06 1.636e-07
15-150 1.342e-05 2.081e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 72.1594 (-3.18906 3.42971)
Norm : 10.6227 (-0.341054 0.352572)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 36.92 using 59 PHA bins.
# Reduced chi-squared = 0.6477 for 57 degrees of freedom
# Null hypothesis probability = 9.820292e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.636e-06 9.908e-08
25- 50 5.832e-06 1.111e-07
50-150 7.660e-06 2.061e-07
15-150 1.713e-05 2.793e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 6.49079 (-0.388579 0.405592)
R1^2/D10^2 : 3.64444 (-0.774389 1.04605)
kT2 [keV] : 20.4212 (-0.944219 1.08072)
R2^2/D10^2 : 4.33820E-02 (-0.00889839 0.0102517)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 41.07 using 59 PHA bins.
# Reduced chi-squared = 0.7466 for 55 degrees of freedom
# Null hypothesis probability = 9.186301e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.472e-06 2.161e-07
25- 50 5.870e-06 1.802e-07
50-150 7.643e-06 2.607e-07
15-150 1.699e-05 4.123e-07
Peak spectrum fit
Power-law model
Time interval is from 33.816 sec. to 34.816 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.73064 ( -0.0483613 0.0486327 )
Norm@50keV : 0.130575 ( -0.00351432 0.00351214 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 56.34 using 59 PHA bins.
# Reduced chi-squared = 0.9884 for 57 degrees of freedom
# Null hypothesis probability = 4.998174e-01
Photon flux (15-150 keV) in 1 sec: 17.5316 ( -0.520286 0.521946 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.2063e-06 ( -3.32555e-08 3.32849e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 33.816 sec. to 34.816 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.19722 ( -0.219603 0.209685 )
Epeak [keV] : 80.6844 ( -9.62778 18.7142 )
Norm@50keV : 0.232402 ( -0.04615 0.0608558 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 36.28 using 59 PHA bins.
# Reduced chi-squared = 0.6478 for 56 degrees of freedom
# Null hypothesis probability = 9.811254e-01
Photon flux (15-150 keV) in 1 sec: 16.8617 ( -0.5693 0.5727 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.16971e-06 ( 0 0 ) ergs/cm2
Band function
Time interval is from 33.816 sec. to 34.816 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.07858 ( -0.296986 0.35223 )
beta : -2.12346 ( 2.12529 0.204688 )
Epeak [keV] : 71.9011 ( -13.7638 23.6832 )
Norm@50keV : 0.270369 ( -0.0776661 0.150163 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 35.63 using 59 PHA bins.
# Reduced chi-squared = 0.6478 for 55 degrees of freedom
# Null hypothesis probability = 9.801770e-01
Photon flux (15-150 keV) in 1 sec: 16.7782 ( -9.7782 -0.5852 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.16641e-06 ( 0 0 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 14.7039 ( )
R^2/D10^2 : 1.98357 ( )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 282.16 using 59 PHA bins.
# Reduced chi-squared = 4.9501 for 57 degrees of freedom
# Null hypothesis probability = 1.496686e-31
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 9.006e-08 5.090e-09
25- 50 3.513e-07 1.220e-08
50-150 5.122e-07 2.495e-08
15-150 9.535e-07 2.780e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 136.731 (-15.514 16.885)
Norm : 72.1247 (-2.52529 2.87823)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 36.72 using 59 PHA bins.
# Reduced chi-squared = 0.6443 for 57 degrees of freedom
# Null hypothesis probability = 9.831011e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.831e-07 1.065e-08
25- 50 3.366e-07 1.660e-08
50-150 6.484e-07 1.418e-07
15-150 1.168e-06 1.528e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 7.04453 (-0.908069 0.994361)
R1^2/D10^2 : 17.1966 (-5.99589 10.8364)
kT2 [keV] : 22.9355 (-2.12069 2.93857)
R2^2/D10^2 : 0.297329 (-0.116805 0.149226)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 51.54 using 59 PHA bins.
# Reduced chi-squared = 0.9372 for 55 degrees of freedom
# Null hypothesis probability = 6.074607e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.664e-07 1.660e-08
25- 50 3.451e-07 2.285e-08
50-150 6.366e-07 5.330e-08
15-150 1.148e-06 7.200e-08
Plot creation:
Fri May 29 15:12:56 EDT 2020