batgrbproduct analysis for trigger=970886
batgrbproduct Analysis for Trigger=970886
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): Sun May 10 14:47:32 EDT 2020
Host Name: bat1
Current Working Dir: /local/data/bat1/prebascript/trigger970886/GCN5_download_cron
======================================================================
Trigger: 00970886 Segment: 000
BAT Trigger Time: 610699662.336 [s; MET]
Trigger Stop: 610699666.432 [s; MET]
UTC: 2020-05-09T06:47:17.426340 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 116.449929380473 Dec: -4.64135929017309 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 10.2
Image Trigger?: NO
Rate S/N Ratio: 13.1529464379659 [ if not an image trigger ]
Image S/N Ratio: 10.2
Flight Position: [ source = BAT ]
RA: 116.449929380473 Dec: -4.64135929017309 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 116.412145764794 Dec: -4.63488833468982 [deg; J2000]
{ 07h 45m 38.9s , -04d 38' 05.6" }
+/- 1.66362104157675 [arcmin] (estimated 90% radius based on SNR)
+/- 0.818611800168268 [arcmin] (formal 1-sigma fit error)
SNR: 14.7003059386857
Angular difference between Flight and Ground position is 2.292707 arcmin
Partial Coding Fraction: 0.3984375 [ including projection effects ]
Duration
T90: 828.335999965668 +/- 13.3094474626136
Measured from: 3.3600001335144
to: 831.696000099182 [s; relative to TRIGTIME]
T50: 368.360000014305 +/- 285.442647976417
Measured from: 446.076000094414
to: 814.436000108719 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 822.692000031471
to: 823.692000031471 [s; relative to TRIGTIME]
Total Fluence
Measured from: -0.796000003814697
to: 848.991999983788 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 3.070280 4.146130 3.229660 0.832418
0.179433 0.186453 0.165921 0.152105 [error]
Peak 0.064522 0.049708 0.039922 0.012871
0.006578 0.006927 0.006004 0.005075 [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 1.17e-06 1.94e-06 2.44e-06 6.14e-06 7.26e-06 1.17e-05 erg/cm2
Error 1.04e-07 1.04e-07 1.64e-07 8.90e-07 3.94e-07 1.01e-06 erg/cm2
Peak flux Power-law 6.74e-01 5.02e-01 2.49e-01 1.76e-01 1.51e+00 1.60e+00 ph/cm2/s
Error 1.35e-01 6.36e-02 5.26e-02 7.34e-02 1.95e-01 2.02e-01 ph/cm2/s
Fluence Cutoff-PL 1.07e-06 2.01e-06 2.52e-06 3.40e-06 7.05e-06 9.00e-06 erg/cm2
Error 1.28e-07 1.23e-07 1.81e-07 1.70e-06 4.34e-07 1.73e-06 erg/cm2
Peak flux Cutoff-PL 6.87e-01 5.03e-01 2.44e-01 1.67e-01 1.51e+00 1.60e+00 ph/cm2/s
Error 1.36e-01 4.83e-02 5.29e-02 8.76e-02 -------- 2.03e-01 ph/cm2/s
Fluence Band 1.06e-06 2.01e-06 2.50e-06 4.22e-06 7.04e-06 9.84e-06 erg/cm2
Error 1.29e-07 -------- -------- -------- 4.32e-07 -------- erg/cm2
Peak flux Band 2.19e-01 2.91e-01 2.83e-01 4.90e-01 9.55e-01 1.28e+00 ph/cm2/s
Error 1.44e-01 -------- 8.46e-02 -------- -------- -------- ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.666 0.091 - - 9.22e-04 4.77e-05 41.510 57
CPL 1.225 0.386 90.0 95.9 1.52e-03 6.80e-04 37.300 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 2.011 0.258 - - 1.00e-02 1.56e-03 49.730 57
CPL 2.870 0.792 280.9 -106.9 3.98e-03 6.94e-03 48.430 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: 825.408000 sec.
T50 in the 50-300 keV band: 770.304000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 849.788 -0.796 848.992
T90 828.336 3.360 831.696
T50 368.360 446.076 814.436
Peak 1.000 822.692 823.692
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
116.4121 -4.6349 0.0131 46.5 -171.0 2.0704 14.7 TRIG_00970886
------------------------------------------
Foreground time interval of the image:
-0.796 27.074 (delta_t = 27.870 [sec])
27.664 37.565 (delta_t = 9.901 [sec])
Background time interval of the image:
-239.336 -56.337 (delta_t = 182.999 [sec])
-55.336 -0.796 (delta_t = 54.540 [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
Multiple GTIs in the spectrum
tstart tstop
-0.796000 27.074000
27.664000 287.714000
288.664000 848.992000
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.66623 ( -0.0906676 0.0914622 )
Norm@50keV : 9.21876E-04 ( -4.77516e-05 4.76315e-05 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 41.51 using 59 PHA bins.
# Reduced chi-squared = 0.7283 for 57 degrees of freedom
# Null hypothesis probability = 9.386369e-01
Photon flux (15-150 keV) in 848.2 sec: 0.121026 ( -0.00649802 0.00651658 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.26087e-06 ( -3.93537e-07 3.94805e-07 ) ergs/cm2
Cutoff power-law model
Multiple GTIs in the spectrum
tstart tstop
-0.796000 27.074000
27.664000 287.714000
288.664000 848.992000
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.22525 ( -0.402044 0.369092 )
Epeak [keV] : 89.9970 ( -21.3943 170.383 )
Norm@50keV : 1.51893E-03 ( -0.00050843 0.000851597 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 37.30 using 59 PHA bins.
# Reduced chi-squared = 0.6661 for 56 degrees of freedom
# Null hypothesis probability = 9.743357e-01
Photon flux (15-150 keV) in 848.2 sec: 0.117935 ( -0.006946 0.006977 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.05348e-06 ( -4.3455e-07 4.33167e-07 ) ergs/cm2
Band function
Multiple GTIs in the spectrum
tstart tstop
-0.796000 27.074000
27.664000 287.714000
288.664000 848.992000
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.19688 ( -0.37325 1.87312 )
beta : -2.14054 ( 2.14504 0.459223 )
Epeak [keV] : 86.2140 ( -53.1518 159.828 )
Norm@50keV : 1.57650E-03 ( -0.000552994 0.0162588 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 37.25 using 59 PHA bins.
# Reduced chi-squared = 0.6772 for 55 degrees of freedom
# Null hypothesis probability = 9.681236e-01
Photon flux (15-150 keV) in 848.2 sec: 0.117781 ( 6.88222 -0.006975 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.03834e-06 ( -7.0324e-06 -4.31912e-07 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 14.4939 (-0.887488 0.948538)
R^2/D10^2 : 1.47440E-02 (-0.00305073 0.00383078)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 112.74 using 59 PHA bins.
# Reduced chi-squared = 1.9779 for 57 degrees of freedom
# Null hypothesis probability = 1.555819e-05
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.528e-07 5.289e-08
25- 50 2.127e-06 1.306e-07
50-150 2.993e-06 2.833e-07
15-150 5.672e-06 3.448e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 155.733 (-34.8109 45.1075)
Norm : 0.493459 (-0.0291112 0.0356458)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 37.41 using 59 PHA bins.
# Reduced chi-squared = 0.6562 for 57 degrees of freedom
# Null hypothesis probability = 9.791661e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.071e-06 8.482e-08
25- 50 1.997e-06 2.311e-07
50-150 4.002e-06 1.254e-06
15-150 7.070e-06 1.362e-06
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 6.50246 (-1.27834 1.48274)
R1^2/D10^2 : 0.159723 (-0.0791221 0.198987)
kT2 [keV] : 22.4379 (-3.12174 5.0272)
R2^2/D10^2 : 2.39314E-03 (-0.00131422 0.00198107)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 39.97 using 59 PHA bins.
# Reduced chi-squared = 0.7266 for 55 degrees of freedom
# Null hypothesis probability = 9.363424e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.034e-06 2.397e-07
25- 50 2.004e-06 3.117e-07
50-150 3.898e-06 7.905e-07
15-150 6.936e-06 1.154e-06
Peak spectrum fit
Power-law model
Time interval is from 822.692 sec. to 823.692 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.01081 ( -0.246697 0.269201 )
Norm@50keV : 1.00011E-02 ( -0.00160072 0.00152863 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 49.73 using 59 PHA bins.
# Reduced chi-squared = 0.8725 for 57 degrees of freedom
# Null hypothesis probability = 7.417565e-01
Photon flux (15-150 keV) in 1 sec: 1.50767 ( -0.194545 0.195078 ) ph/cm2/s
Energy fluence (15-150 keV) : 9.22836e-08 ( -1.35482e-08 1.37095e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 822.692 sec. to 823.692 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.86979 ( -1.21689 0.366615 )
Epeak [keV] : 280.901 ( -65.198 -278.972 )
Norm@50keV : 3.97902E-03 ( -0.00283229 0.0110537 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 48.43 using 59 PHA bins.
# Reduced chi-squared = 0.8648 for 56 degrees of freedom
# Null hypothesis probability = 7.539140e-01
Photon flux (15-150 keV) in 1 sec: 1.51165 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 9.2148e-08 ( -1.34072e-08 1.3858e-08 ) ergs/cm2
Band function
Time interval is from 822.692 sec. to 823.692 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.84192 ( 1.8426 1.8426 )
beta : -2.01059 ( 2.01073 0.246202 )
Epeak [keV] : 11.8673 ( -11.6329 -11.6329 )
Norm@50keV : 1.49246E-02 ( -0.00611973 1.5521 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 49.73 using 59 PHA bins.
# Reduced chi-squared = 0.9042 for 55 degrees of freedom
# Null hypothesis probability = 6.754759e-01
Photon flux (15-150 keV) in 1 sec: 0.955421 ( ) 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] : 12.2320 (-2.07474 2.36114)
R^2/D10^2 : 0.312505 (-0.149515 0.311666)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 76.52 using 59 PHA bins.
# Reduced chi-squared = 1.342 for 57 degrees of freedom
# Null hypothesis probability = 4.327041e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 9.903e-09 2.615e-09
25- 50 3.187e-08 7.105e-09
50-150 2.904e-08 8.875e-09
15-150 7.081e-08 1.349e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 81.1543 (-28.3457 56.6838)
Norm : 6.87498 (-1.29366 1.71283)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 53.18 using 59 PHA bins.
# Reduced chi-squared = 0.9330 for 57 degrees of freedom
# Null hypothesis probability = 6.190169e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.786e-08 3.205e-09
25- 50 2.949e-08 4.480e-09
50-150 4.203e-08 1.793e-08
15-150 8.939e-08 2.014e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 3.12612 (-0.797721 1.09489)
R1^2/D10^2 : 78.4533 (-62.855 248.89)
kT2 [keV] : 17.3060 (-3.15985 4.4209)
R2^2/D10^2 : 7.39598E-02 (-0.0427736 0.0854145)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 44.71 using 59 PHA bins.
# Reduced chi-squared = 0.8130 for 55 degrees of freedom
# Null hypothesis probability = 8.376906e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.335e-08 1.173e-08
25- 50 2.331e-08 8.223e-09
50-150 4.332e-08 1.701e-08
15-150 8.997e-08 2.669e-08
Plot creation:
Sun May 10 14:52:50 EDT 2020