batgrbproduct analysis for trigger=998907
batgrbproduct Analysis for Trigger=998907
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 v2.48
Process Start Time (local time): Tue Oct 6 14:59:38 EDT 2020
Host Name: bat1
Current Working Dir: /local/data/bat1/prebascript/trigger998907/batgroup_hand_proc
======================================================================
Trigger: 00998907 Segment: 000
BAT Trigger Time: 623639897.792 [s; MET]
Trigger Stop: 623639898.304 [s; MET]
UTC: 2020-10-06T01:17:52.036340 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 61.8805369706886 Dec: 65.1498487714513 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 8.04
Image Trigger?: NO
Rate S/N Ratio: 20.1990098767242 [ if not an image trigger ]
Image S/N Ratio: 8.04
Flight Position: [ source = BAT ]
RA: 61.8805369706886 Dec: 65.1498487714513 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 61.9170420345316 Dec: 65.1481394374931 [deg; J2000]
{ 04h 07m 40.1s , +65d 08' 53.3" }
+/- 2.05758310168445 [arcmin] (estimated 90% radius based on SNR)
+/- 0.969540651508817 [arcmin] (formal 1-sigma fit error)
SNR: 10.8508803217529
Angular difference between Flight and Ground position is 0.926193 arcmin
Partial Coding Fraction: 0.3359375 [ including projection effects ]
Duration
T90: 0.491999864578247 +/- 0.0856036610542782
Measured from: 0.0279999971389771
to: 0.519999861717224 [s; relative to TRIGTIME]
T50: 0.24399995803833 +/- 0.0920869208510307
Measured from: 0.131999969482422
to: 0.375999927520752 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: -0.230000019073486
to: 0.769999980926514 [s; relative to TRIGTIME]
Total Fluence
Measured from: -0.00800001621246338
to: 0.543999910354614 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.042987 0.093980 0.066666 0.021653
0.010638 0.012310 0.010622 0.008562 [error]
Peak 0.056167 0.132179 0.074053 0.003812
0.013569 0.015138 0.013209 0.011387 [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 1.61e-08 3.11e-08 4.65e-08 1.50e-07 1.31e-07 2.43e-07 erg/cm2
Error 4.11e-09 5.27e-09 9.29e-09 6.04e-08 2.34e-08 6.84e-08 erg/cm2
Peak flux Power-law 7.30e-01 7.29e-01 5.11e-01 5.67e-01 2.19e+00 2.54e+00 ph/cm2/s
Error 1.72e-01 1.18e-01 1.00e-01 2.09e-01 3.46e-01 4.07e-01 ph/cm2/s
Fluence Cutoff-PL 1.30e-08 3.82e-08 4.99e-08 2.24e-08 1.18e-07 1.23e-07 erg/cm2
Error 4.73e-09 7.83e-09 1.20e-08 4.05e-08 2.49e-08 4.39e-08 erg/cm2
Peak flux Cutoff-PL 4.91e-01 9.72e-01 5.59e-01 5.50e-02 2.07e+00 2.08e+00 ph/cm2/s
Error 2.04e-01 1.79e-01 1.40e-01 8.47e-02 3.49e-01 3.54e-01 ph/cm2/s
Fluence Band 1.21e-08 4.16e-08 4.54e-08 7.76e-08 1.25e-07 1.76e-07 erg/cm2
Error 4.96e-09 8.57e-09 1.07e-08 -------- 2.39e-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 1.421 0.245 - - 2.46e-02 4.05e-03 65.030 57
CPL -0.268 1.495 63.5 32.0 1.94e-01 8.14e-01 59.270 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.514 0.233 - - 1.75e-02 2.85e-03 70.510 57
CPL -1.381 1.879 53.3 8.3 6.29e-01 4.84e+00 57.020 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: 0.448000 sec.
T50 in the 50-300 keV band: 0.320000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 0.552 -0.008 0.544
T90 0.492 0.028 0.520
T50 0.244 0.132 0.376
Peak 1.000 -0.230 0.770
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
61.9170 +65.1481 0.0177 31.3 85.3 0.2402 10.9 TRIG_00998907
------------------------------------------
Foreground time interval of the image:
-0.008 0.544 (delta_t = 0.552 [sec])
Background time interval of the image:
-65.291 -0.008 (delta_t = 65.283 [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 -0.008 sec. to 0.544 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.42106 ( -0.24449 0.245082 )
Norm@50keV : 2.46424E-02 ( -0.00405823 0.0040436 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 65.03 using 59 PHA bins.
# Reduced chi-squared = 1.141 for 57 degrees of freedom
# Null hypothesis probability = 2.173499e-01
Photon flux (15-150 keV) in 0.552 sec: 3.01567 ( -0.495461 0.496162 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.30883e-07 ( -2.32374e-08 2.34938e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.008 sec. to 0.544 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -0.267716 ( -1.73895 1.25009 )
Epeak [keV] : 63.4977 ( -13.7056 50.2751 )
Norm@50keV : 0.194327 ( -0.19433 1.43307 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 59.27 using 59 PHA bins.
# Reduced chi-squared = 1.058 for 56 degrees of freedom
# Null hypothesis probability = 3.570938e-01
Photon flux (15-150 keV) in 0.552 sec: 2.92215 ( -0.50244 0.50335 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.17819e-07 ( -2.42869e-08 2.55962e-08 ) ergs/cm2
Band function
Time interval is from -0.008 sec. to 0.544 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 4.64013 ( -5.23617 -4.64013 )
beta : -2.01309 ( -0.561554 0.426136 )
Epeak [keV] : 37.1684 ( -5.75261 6.93776 )
Norm@50keV : 162.833 ( -25.4727 1193.94 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 57.70 using 59 PHA bins.
# Reduced chi-squared = 1.049 for 55 degrees of freedom
# Null hypothesis probability = 3.758017e-01
Photon flux (15-150 keV) in 0.552 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 1.24519e-07 ( -1.24515e-07 -2.37299e-08 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 14.3914 (-2.21129 2.74104)
R^2/D10^2 : 0.439552 (-0.205471 0.355147)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 61.00 using 59 PHA bins.
# Reduced chi-squared = 1.070 for 57 degrees of freedom
# Null hypothesis probability = 3.341490e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.058e-08 3.182e-09
25- 50 4.044e-08 1.105e-08
50-150 5.592e-08 1.806e-08
15-150 1.069e-07 2.539e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 199.361 (-83.9338 -199.362)
Norm : 12.6004 (-2.02553 2.02835)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 63.68 using 59 PHA bins.
# Reduced chi-squared = 1.117 for 57 degrees of freedom
# Null hypothesis probability = 2.532093e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.732e-08 1.002e-08
25- 50 3.332e-08 1.888e-08
50-150 7.307e-08 4.112e-08
15-150 1.237e-07 6.944e-08
Double BB
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 12.2233 (-8.16644 3.50642)
R1^2/D10^2 : 0.687032 (-0.414989 6.40049)
kT2 [keV] : 77.5388 (-52.0678 -52.0679)
R2^2/D10^2 : 1.03288E-03 (-0.000565433 0.423694)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 58.15 using 59 PHA bins.
#Fit statistic : Chi-Squared = 58.12 using 59 PHA bins.
# Reduced chi-squared = 1.057 for 55 degrees of freedom
# Reduced chi-squared = 1.057 for 55 degrees of freedom
# Null hypothesis probability = 3.602337e-01
# Null hypothesis probability = 3.610320e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.251e-08 7.347e-09
25- 50 4.037e-08 2.352e-08
50-150 7.057e-08 3.447e-08
15-150 1.234e-07 5.980e-08
Peak spectrum fit
Power-law model
Time interval is from -0.230 sec. to 0.770 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.51355 ( -0.230629 0.235087 )
Norm@50keV : 1.75119E-02 ( -0.0028567 0.00283878 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 70.51 using 59 PHA bins.
# Reduced chi-squared = 1.237 for 57 degrees of freedom
# Null hypothesis probability = 1.077316e-01
Photon flux (15-150 keV) in 1 sec: 2.19413 ( -0.345991 0.34636 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.65791e-07 ( -2.88969e-08 2.93348e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.230 sec. to 0.770 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -1.38088 ( -2.22511 1.53319 )
Epeak [keV] : 53.2839 ( -7.56396 9.00907 )
Norm@50keV : 0.628881 ( -0.643666 9.03865 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 57.02 using 59 PHA bins.
# Reduced chi-squared = 1.018 for 56 degrees of freedom
# Null hypothesis probability = 4.368249e-01
Photon flux (15-150 keV) in 1 sec: 2.07318 ( -0.34779 0.35052 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.4127e-07 ( -2.6516e-08 2.9406e-08 ) ergs/cm2
Band function
Time interval is from -0.230 sec. to 0.770 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 2.23687 ( -2.30705 -2.23676 )
beta : -3.04036 ( 3.04025 0.99998 )
Epeak [keV] : 48.5424 ( -9.27248 16.9567 )
Norm@50keV : 2.07356 ( -2.07338 46.4981 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 56.75 using 59 PHA bins.
# Reduced chi-squared = 1.032 for 55 degrees of freedom
# Null hypothesis probability = 4.096406e-01
Photon flux (15-150 keV) in 1 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 1.48595e-07 ( 0 0 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 13.5921 (-1.76299 2.08407)
R^2/D10^2 : 0.399539 (-0.163124 0.257814)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 57.11 using 59 PHA bins.
# Reduced chi-squared = 1.002 for 57 degrees of freedom
# Null hypothesis probability = 4.710758e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.563e-08 3.975e-09
25- 50 5.641e-08 1.060e-08
50-150 6.756e-08 2.140e-08
15-150 1.396e-07 2.990e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 175.840 (-79.7073 -173.379)
Norm : 9.16806 (-1.47282 1.66013)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 67.21 using 59 PHA bins.
# Reduced chi-squared = 1.179 for 57 degrees of freedom
# Null hypothesis probability = 1.669973e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.318e-08 1.311e-08
25- 50 4.391e-08 2.409e-08
50-150 9.220e-08 5.240e-08
15-150 1.593e-07 8.905e-08
Double BB
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 198.659 (-198.659 -198.659)
R1^2/D10^2 : 5.32078E-05 (-5.32081e-05 0.635804)
kT2 [keV] : 13.0759 (-2.17588 2.38013)
R2^2/D10^2 : 0.443889 (-0.139954 3.18685)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 57.07 using 59 PHA bins.
#Fit statistic : Chi-Squared = 56.75 using 59 PHA bins.
# Reduced chi-squared = 1.038 for 55 degrees of freedom
# Reduced chi-squared = 1.032 for 55 degrees of freedom
# Null hypothesis probability = 3.982219e-01
# Null hypothesis probability = 4.094735e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.600e-08 3.909e-06
25- 50 5.614e-08 3.300e-05
50-150 6.893e-08 7.610e-04
15-150 1.411e-07 7.620e-04
Plot creation:
Tue Oct 6 18:09:02 EDT 2020