batgrbproduct analysis for trigger=973140
batgrbproduct Analysis for Trigger=973140
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 22 13:36:35 EDT 2020
Host Name: bat1
Current Working Dir: /local/data/bat1/prebascript/trigger973140/batgroup_hand_proc
======================================================================
Trigger: 00973140 Segment: 000
BAT Trigger Time: 611580048.704 [s; MET]
Trigger Stop: 611580049.216 [s; MET]
UTC: 2020-05-19T11:20:23.737180 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 255.333724559987 Dec: -30.3801063280011 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 11.13
Image Trigger?: NO
Rate S/N Ratio: 25.298221281347 [ if not an image trigger ]
Image S/N Ratio: 11.13
Flight Position: [ source = BAT ]
RA: 255.333724559987 Dec: -30.3801063280011 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 255.320454002219 Dec: -30.3938970822168 [deg; J2000]
{ 17h 01m 16.9s , -30d 23' 38.0" }
+/- 0.847485769413595 [arcmin] (estimated 90% radius based on SNR)
+/- 0.296432086207128 [arcmin] (formal 1-sigma fit error)
SNR: 38.5288777533743
Angular difference between Flight and Ground position is 1.075376 arcmin
Partial Coding Fraction: 0.9921875 [ including projection effects ]
Duration
T90: 71.6959999799728 +/- 1.20481696025365
Measured from: 3.24800002574921
to: 74.944000005722 [s; relative to TRIGTIME]
T50: 5.77199995517731 +/- 0.249735854854711
Measured from: 21.8040000200272
to: 27.5759999752045 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 23.527999997139
to: 24.527999997139 [s; relative to TRIGTIME]
Total Fluence
Measured from: -0.452000021934509
to: 100.703999996185 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 5.062331 7.095895 5.637760 1.432913
0.075752 0.072158 0.062951 0.049236 [error]
Peak 0.548175 0.923295 0.963818 0.280682
0.013064 0.016032 0.016750 0.011741 [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 1.45e-06 2.81e-06 4.21e-06 1.37e-05 1.19e-05 2.21e-05 erg/cm2
Error 5.36e-08 5.95e-08 7.46e-08 5.90e-07 1.90e-07 6.06e-07 erg/cm2
Peak flux Power-law 4.83e+00 6.31e+00 6.03e+00 1.02e+01 2.06e+01 2.74e+01 ph/cm2/s
Error 2.28e-01 1.77e-01 1.41e-01 5.37e-01 4.65e-01 6.28e-01 ph/cm2/s
Fluence Cutoff-PL 1.42e-06 2.82e-06 4.25e-06 1.26e-05 1.18e-05 2.11e-05 erg/cm2
Error 7.44e-08 6.01e-08 9.03e-08 1.59e-06 2.01e-07 1.59e-06 erg/cm2
Peak flux Cutoff-PL 4.48e+00 6.34e+00 6.21e+00 8.16e+00 2.03e+01 2.52e+01 ph/cm2/s
Error 3.13e-01 1.82e-01 1.81e-01 1.20e+00 4.98e-01 1.34e+00 ph/cm2/s
Fluence Band -------- -------- -------- -------- -------- -------- erg/cm2
Error -------- -------- -------- -------- -------- -------- 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 1.416 0.032 - - 1.22e-02 1.99e-04 42.610 57
CPL 1.346 0.115 569.2 0.0 1.30e-02 1.32e-03 41.710 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.066 0.040 - - 1.78e-01 3.87e-03 49.140 57
CPL 0.819 0.164 290.5 243.4 2.25e-01 3.47e-02 42.190 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: 52.160000 sec.
T50 in the 50-300 keV band: 4.032000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 101.156 -0.452 100.704
T90 71.696 3.248 74.944
T50 5.772 21.804 27.576
Peak 1.000 23.528 24.528
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
255.3205 -30.3939 0.0050 8.0 50.8 1.5719 38.5 TRIG_00973140
------------------------------------------
Foreground time interval of the image:
-0.452 9.997 (delta_t = 10.449 [sec])
Background time interval of the image:
-239.704 -0.452 (delta_t = 239.252 [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 -0.452 sec. to 100.704 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.41554 ( -0.0315838 0.0315135 )
Norm@50keV : 1.21686E-02 ( -0.000198711 0.000198426 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 42.61 using 59 PHA bins.
# Reduced chi-squared = 0.7475 for 57 degrees of freedom
# Null hypothesis probability = 9.218558e-01
Photon flux (15-150 keV) in 101.2 sec: 1.48722 ( -0.02881 0.0289296 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.18621e-05 ( -1.90256e-07 1.90283e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.452 sec. to 100.704 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.34621 ( -0.127289 0.101965 )
Epeak [keV] : 569.226 ( -569.234 -569.234 )
Norm@50keV : 1.29996E-02 ( -0.00100086 0.00162958 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 41.71 using 59 PHA bins.
# Reduced chi-squared = 0.7449 for 56 degrees of freedom
# Null hypothesis probability = 9.223536e-01
Photon flux (15-150 keV) in 101.2 sec: 1.47728 ( -0.0333 0.03339 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.18224e-05 ( -2.06954e-07 1.95012e-07 ) ergs/cm2
Band function
Time interval is from -0.452 sec. to 100.704 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.529959 ( -0.702217 5.51174 )
beta : -1.43719 ( -0.0428276 0.0397605 )
Epeak [keV] : 52.8599 ( -22.78 152.053 )
Norm@50keV : 4.47928E-02 ( -0.0255716 535.307 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 39.52 using 59 PHA bins.
# Reduced chi-squared = 0.7185 for 55 degrees of freedom
# Null hypothesis probability = 9.426897e-01
Photon flux (15-150 keV) in 101.2 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] : 19.6504 ( )
R^2/D10^2 : 6.47277E-02 ( )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 802.81 using 59 PHA bins.
# Reduced chi-squared = 14.084 for 57 degrees of freedom
# Null hypothesis probability = 3.482125e-132
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.910e-07 1.731e-08
25- 50 2.417e-06 6.021e-08
50-150 6.900e-06 1.650e-07
15-150 9.808e-06 1.746e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 199.363 ( )
Norm : 6.29715 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 156.64 using 59 PHA bins.
# Reduced chi-squared = 2.7480 for 57 degrees of freedom
# Null hypothesis probability = 3.109293e-11
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.587e-06 3.087e-08
25- 50 3.053e-06 5.870e-08
50-150 6.695e-06 1.361e-07
15-150 1.133e-05 2.328e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 7.92668 (-0.499214 0.527176)
R1^2/D10^2 : 0.931870 (-0.186767 0.244381)
kT2 [keV] : 31.2924 (-1.76927 2.10407)
R2^2/D10^2 : 1.11119E-02 (-0.00223331 0.0025219)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 46.17 using 59 PHA bins.
# Reduced chi-squared = 0.8394 for 55 degrees of freedom
# Null hypothesis probability = 7.959931e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.232e-06 7.438e-08
25- 50 2.886e-06 9.614e-08
50-150 7.621e-06 2.378e-07
15-150 1.174e-05 2.985e-07
Peak spectrum fit
Power-law model
Time interval is from 23.528 sec. to 24.528 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.06555 ( -0.0399336 0.0398503 )
Norm@50keV : 0.177869 ( -0.00386954 0.00386624 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 49.14 using 59 PHA bins.
# Reduced chi-squared = 0.8621 for 57 degrees of freedom
# Null hypothesis probability = 7.611172e-01
Photon flux (15-150 keV) in 1 sec: 20.5681 ( -0.46449 0.46549 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.88062e-06 ( -4.34797e-08 4.35306e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 23.528 sec. to 24.528 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.818933 ( -0.166647 0.16081 )
Epeak [keV] : 290.486 ( -91.8704 394.881 )
Norm@50keV : 0.225426 ( -0.0315539 0.03793 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 42.19 using 59 PHA bins.
# Reduced chi-squared = 0.7535 for 56 degrees of freedom
# Null hypothesis probability = 9.140395e-01
Photon flux (15-150 keV) in 1 sec: 20.2771 ( -0.4971 0.4987 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.86311e-06 ( 0 0 ) ergs/cm2
Band function
Time interval is from 23.528 sec. to 24.528 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 4.99994 ( -4.99994 -4.99994 )
beta : -1.08322 ( -0.0417192 0.0415375 )
Epeak [keV] : 25.9842 ( -25.9842 3.18645 )
Norm@50keV : 9884.83 ( -210.757 2.05177e+07 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 46.73 using 59 PHA bins.
# Reduced chi-squared = 0.8497 for 55 degrees of freedom
# Null hypothesis probability = 7.784647e-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] : 22.5201 ( )
R^2/D10^2 : 0.670955 ( )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 348.56 using 59 PHA bins.
# Reduced chi-squared = 6.1151 for 57 degrees of freedom
# Null hypothesis probability = 1.823806e-43
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 6.229e-08 2.750e-09
25- 50 3.339e-07 1.110e-08
50-150 1.266e-06 4.350e-08
15-150 1.662e-06 4.350e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 199.363 ( )
Norm : 86.2752 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 473.67 using 59 PHA bins.
# Reduced chi-squared = 8.3099 for 57 degrees of freedom
# Null hypothesis probability = 5.451045e-67
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.148e-07 5.050e-09
25- 50 4.133e-07 9.900e-09
50-150 9.064e-07 1.990e-08
15-150 1.535e-06 3.500e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 7.67593 (-0.778038 0.873606)
R1^2/D10^2 : 10.4833 (-3.0894 4.65409)
kT2 [keV] : 32.1364 (-2.08466 2.60811)
R2^2/D10^2 : 0.191690 (-0.0434025 0.0478089)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 38.27 using 59 PHA bins.
# Reduced chi-squared = 0.6958 for 55 degrees of freedom
# Null hypothesis probability = 9.580293e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.378e-07 1.400e-08
25- 50 3.639e-07 1.915e-08
50-150 1.371e-06 5.900e-08
15-150 1.873e-06 7.000e-08
Plot creation:
Fri May 22 13:53:21 EDT 2020