batgrbproduct analysis for trigger=931242
batgrbproduct Analysis for Trigger=931242
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 Oct 25 08:34:02 EDT 2019
Host Name: bat1
Current Working Dir: /local/data/bat1/prebascript/trigger931242/GCN5_download_cron
======================================================================
Trigger: 00931242 Segment: 000
BAT Trigger Time: 593584996.416 [s; MET]
Trigger Stop: 593584996.928 [s; MET]
UTC: 2019-10-24T04:42:52.615160 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 10.1472153743508 Dec: -67.1394119919046 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 8.68
Image Trigger?: NO
Rate S/N Ratio: 16.1864140562386 [ if not an image trigger ]
Image S/N Ratio: 8.68
Flight Position: [ source = BAT ]
RA: 10.1472153743508 Dec: -67.1394119919046 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 10.1283169544751 Dec: -67.1378116524601 [deg; J2000]
{ 00h 40m 30.8s , -67d 08' 16.1" }
+/- 1.30506223103522 [arcmin] (estimated 90% radius based on SNR)
+/- 0.524329187199422 [arcmin] (formal 1-sigma fit error)
SNR: 20.793659167988
Angular difference between Flight and Ground position is 0.450869 arcmin
Partial Coding Fraction: 0.90625 [ including projection effects ]
Duration
T90: 7.08399987220764 +/- 0.978243413242523
Measured from: -0.583999872207642
to: 6.5 [s; relative to TRIGTIME]
T50: 3.31199991703033 +/- 0.537921908167165
Measured from: 0.312000155448914
to: 3.62400007247925 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: -0.307999968528748
to: 0.692000031471252 [s; relative to TRIGTIME]
Total Fluence
Measured from: -0.955999970436096
to: 7.44799995422363 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.269138 0.326410 0.173104 0.066608
0.020423 0.021214 0.018380 0.015597 [error]
Peak 0.065011 0.076225 0.044090 0.016799
0.007311 0.007799 0.006953 0.005559 [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 8.46e-08 1.31e-07 1.52e-07 3.40e-07 4.68e-07 7.08e-07 erg/cm2
Error 9.87e-09 9.93e-09 1.78e-08 8.13e-08 4.15e-08 9.83e-08 erg/cm2
Peak flux Power-law 6.37e-01 5.42e-01 3.14e-01 2.72e-01 1.61e+00 1.76e+00 ph/cm2/s
Error 1.08e-01 6.21e-02 5.60e-02 9.31e-02 1.85e-01 2.08e-01 ph/cm2/s
Fluence Cutoff-PL 8.17e-08 1.37e-07 1.52e-07 1.83e-07 4.50e-07 5.52e-07 erg/cm2
Error 1.10e-08 1.37e-08 1.92e-08 1.32e-07 5.01e-08 1.38e-07 erg/cm2
Peak flux Cutoff-PL 6.17e-01 5.70e-01 3.13e-01 1.51e-01 1.59e+00 1.65e+00 ph/cm2/s
Error 8.95e-02 8.92e-02 6.27e-02 1.55e-01 1.92e-01 3.12e-01 ph/cm2/s
Fluence Band 7.82e-08 1.42e-07 1.45e-07 2.49e-07 4.49e-07 6.15e-07 erg/cm2
Error 1.15e-08 -------- 1.99e-08 -------- 4.57e-08 -------- 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 1.784 0.138 - - 6.04e-03 5.19e-04 72.440 57
CPL 1.433 0.571 70.9 -24.4 9.50e-03 8.22e-03 71.330 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.785 0.205 - - 1.18e-02 1.60e-03 62.140 57
CPL 1.390 0.973 64.4 0.0 2.00e-02 0.00e+00 61.620 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: 4.160000 sec.
T50 in the 50-300 keV band: 2.304000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 8.404 -0.956 7.448
T90 7.084 -0.584 6.500
T50 3.312 0.312 3.624
Peak 1.000 -0.308 0.692
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
10.1283 -67.1378 0.0092 25.6 -171.8 0.8184 20.8 TRIG_00931242
------------------------------------------
Foreground time interval of the image:
-0.956 7.448 (delta_t = 8.404 [sec])
Background time interval of the image:
-239.416 -0.956 (delta_t = 238.460 [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 -0.956 sec. to 7.448 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.78351 ( -0.136349 0.139358 )
Norm@50keV : 6.04128E-03 ( -0.000522651 0.000516088 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 72.44 using 59 PHA bins.
# Reduced chi-squared = 1.271 for 57 degrees of freedom
# Null hypothesis probability = 8.159480e-02
Photon flux (15-150 keV) in 8.404 sec: 0.827211 ( -0.063276 0.0633126 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.67708e-07 ( -4.12999e-08 4.17875e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.956 sec. to 7.448 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.43254 ( -0.657064 0.48485 )
Epeak [keV] : 70.8848 ( -22.1609 -70.9214 )
Norm@50keV : 9.50059E-03 ( -0.00384928 0.0125869 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 71.33 using 59 PHA bins.
# Reduced chi-squared = 1.274 for 56 degrees of freedom
# Null hypothesis probability = 8.133570e-02
Photon flux (15-150 keV) in 8.404 sec: 0.814950 ( -0.066456 0.066214 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.50379e-07 ( -5.00677e-08 5.00458e-08 ) ergs/cm2
Band function
Time interval is from -0.956 sec. to 7.448 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 4.93020 ( -14.2767 -4.9302 )
beta : -1.87992 ( -0.167743 0.15759 )
Epeak [keV] : 22.6107 ( -4.23854 3.53182 )
Norm@50keV : 1382.16 ( -104.157 7972.85 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 69.08 using 59 PHA bins.
# Reduced chi-squared = 1.256 for 55 degrees of freedom
# Null hypothesis probability = 9.597926e-02
Photon flux (15-150 keV) in 8.404 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 4.49006e-07 ( -4.48947e-07 -4.57926e-08 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 11.1378 (-0.965283 1.07781)
R^2/D10^2 : 0.260615 (-0.0765854 0.106106)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 102.05 using 59 PHA bins.
# Reduced chi-squared = 1.7904 for 57 degrees of freedom
# Null hypothesis probability = 2.309067e-04
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.690e-08 7.572e-09
25- 50 1.635e-07 1.420e-08
50-150 1.156e-07 2.341e-08
15-150 3.360e-07 3.021e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 99.9523 (-24.9689 43.4808)
Norm : 3.65471 (-0.386832 0.440025)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 71.36 using 59 PHA bins.
# Reduced chi-squared = 1.252 for 57 degrees of freedom
# Null hypothesis probability = 9.553579e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 8.028e-08 1.014e-08
25- 50 1.388e-07 1.210e-08
50-150 2.249e-07 7.160e-08
15-150 4.439e-07 8.538e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 8.48696 (-1.66358 1.38074)
R1^2/D10^2 : 0.603530 (-0.226928 0.582093)
kT2 [keV] : 44.3543 (-21.2253 -44.4714)
R2^2/D10^2 : 1.34512E-03 (-0.00110935 0.00994272)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 70.22 using 59 PHA bins.
# Reduced chi-squared = 1.277 for 55 degrees of freedom
# Null hypothesis probability = 8.106517e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 7.145e-08 1.303e-08
25- 50 1.517e-07 3.177e-08
50-150 2.437e-07 1.122e-07
15-150 4.669e-07 1.470e-07
Peak spectrum fit
Power-law model
Time interval is from -0.308 sec. to 0.692 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.78483 ( -0.200929 0.209831 )
Norm@50keV : 1.17617E-02 ( -0.00161322 0.00157797 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 62.14 using 59 PHA bins.
# Reduced chi-squared = 1.090 for 57 degrees of freedom
# Null hypothesis probability = 2.981176e-01
Photon flux (15-150 keV) in 1 sec: 1.61130 ( -0.184885 0.184899 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.08342e-07 ( -1.50268e-08 1.53398e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.308 sec. to 0.692 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.39046 ( -1.15414 0.791764 )
Epeak [keV] : 64.4135 ( )
Norm@50keV : 1.99995E-02 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 61.62 using 59 PHA bins.
# Reduced chi-squared = 1.100 for 56 degrees of freedom
# Null hypothesis probability = 2.819597e-01
Photon flux (15-150 keV) in 1 sec: 1.59024 ( -0.19265 0.19134 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.03345e-07 ( -1.89753e-08 1.8797e-08 ) ergs/cm2
Band function
Time interval is from -0.308 sec. to 0.692 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 4.63628 ( -6.10771 -4.63628 )
beta : -2.02391 ( -0.319339 0.2711 )
Epeak [keV] : 25.6676 ( -4.73577 4.07197 )
Norm@50keV : 770.075 ( -87.4612 10248.6 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 58.36 using 59 PHA bins.
# Reduced chi-squared = 1.061 for 55 degrees of freedom
# Null hypothesis probability = 3.528039e-01
Photon flux (15-150 keV) in 1 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] : 10.4255 (-1.3626 1.57174)
R^2/D10^2 : 0.659586 (-0.269066 0.451174)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 73.78 using 59 PHA bins.
# Reduced chi-squared = 1.294 for 57 degrees of freedom
# Null hypothesis probability = 6.675534e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.479e-08 2.775e-09
25- 50 3.896e-08 5.880e-09
50-150 2.291e-08 6.900e-09
15-150 7.666e-08 1.197e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 95.0297 (-32.925 71.0483)
Norm : 7.24626 (-1.09707 1.37851)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 61.56 using 59 PHA bins.
# Reduced chi-squared = 1.080 for 57 degrees of freedom
# Null hypothesis probability = 3.162504e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.893e-08 3.155e-09
25- 50 3.239e-08 4.725e-09
50-150 5.097e-08 2.233e-08
15-150 1.023e-07 2.729e-08
Double BB
------------------------------------------------------------
#Fit statistic : Chi-Squared = 62.71 using 59 PHA bins.
#Fit statistic : Chi-Squared = 60.36 using 59 PHA bins.
#Fit statistic : Chi-Squared = 58.17 using 59 PHA bins.
#Fit statistic : Chi-Squared = 58.12 using 59 PHA bins.
# Reduced chi-squared = 1.140 for 55 degrees of freedom
# Reduced chi-squared = 1.098 for 55 degrees of freedom
# Reduced chi-squared = 1.058 for 55 degrees of freedom
# Reduced chi-squared = 1.057 for 55 degrees of freedom
# Null hypothesis probability = 2.216915e-01
# Null hypothesis probability = 2.881571e-01
# Null hypothesis probability = 3.595674e-01
# Null hypothesis probability = 3.612906e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.850e-08 1.073e-08
25- 50 3.150e-08 1.693e-08
50-150 3.961e-08 2.526e-08
15-150 8.961e-08 4.900e-08
Plot creation:
Fri Oct 25 08:38:37 EDT 2019