batgrbproduct analysis for trigger=995004
batgrbproduct Analysis for Trigger=995004
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 Sep 8 16:07:49 EDT 2020
Host Name: bat1
Current Working Dir: /local/data/bat1/prebascript/trigger995004/batgroup_hand_proc
======================================================================
Trigger: 00995004 Segment: 000
BAT Trigger Time: 621197496.768 [s; MET]
Trigger Stop: 621197497.024 [s; MET]
UTC: 2020-09-07T18:51:11.173040 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 89.0132987196125 Dec: 6.9106310534709 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 9.45
Image Trigger?: NO
Rate S/N Ratio: 23.4093998214393 [ if not an image trigger ]
Image S/N Ratio: 9.45
Flight Position: [ source = BAT ]
RA: 89.0132987196125 Dec: 6.9106310534709 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 89.0186661880718 Dec: 6.90493001644181 [deg; J2000]
{ 05h 56m 04.5s , +06d 54' 17.7" }
+/- 1.83306134109208 [arcmin] (estimated 90% radius based on SNR)
+/- 0.859541821129795 [arcmin] (formal 1-sigma fit error)
SNR: 12.7982691588517
Angular difference between Flight and Ground position is 0.468211 arcmin
Partial Coding Fraction: 0.7890625 [ including projection effects ]
Duration
T90: 0.832000017166138 +/- 0.133880554639642
Measured from: -0.572000026702881
to: 0.259999990463257 [s; relative to TRIGTIME]
T50: 0.447999954223633 +/- 0.123693125978031
Measured from: -0.324000000953674
to: 0.123999953269958 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: -0.675999999046326
to: 0.324000000953674 [s; relative to TRIGTIME]
Total Fluence
Measured from: -0.639999985694885
to: 0.284000039100647 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.035949 0.051848 0.073322 0.046492
0.007723 0.008401 0.008137 0.007118 [error]
Peak 0.034700 0.053882 0.076359 0.046571
0.007986 0.008730 0.008343 0.007366 [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 7.60e-09 2.32e-08 5.79e-08 4.08e-07 1.57e-07 4.97e-07 erg/cm2
Error 2.47e-09 4.39e-09 7.34e-09 1.36e-07 2.05e-08 1.37e-07 erg/cm2
Peak flux Power-law 2.34e-01 3.96e-01 5.10e-01 1.32e+00 1.50e+00 2.46e+00 ph/cm2/s
Error 7.86e-02 7.99e-02 6.33e-02 3.92e-01 2.00e-01 3.79e-01 ph/cm2/s
Fluence Cutoff-PL 7.44e-09 2.35e-08 5.80e-08 3.75e-07 1.57e-07 4.63e-07 erg/cm2
Error 1.90e-09 4.41e-09 7.38e-09 1.73e-07 2.03e-08 1.72e-07 erg/cm2
Peak flux Cutoff-PL 2.38e-01 4.00e-01 5.10e-01 1.30e+00 1.51e+00 2.45e+00 ph/cm2/s
Error 8.29e-02 7.82e-02 6.64e-02 7.54e-01 2.00e-01 4.84e-01 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 0.680 0.254 - - 1.38e-02 1.96e-03 40.310 57
CPL 0.669 0.257 9999.4 0.0 1.38e-02 4.61e-03 40.350 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 0.636 0.253 - - 1.29e-02 1.88e-03 43.960 57
CPL 0.627 0.498 9999.3 0.0 1.30e-02 5.68e-03 43.990 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: 0.768000 sec.
T50 in the 50-300 keV band: 0.384000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 0.924 -0.640 0.284
T90 0.832 -0.572 0.260
T50 0.448 -0.324 0.124
Peak 1.000 -0.676 0.324
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
89.0187 +6.9049 0.0150 23.6 149.2 0.2067 12.8 TRIG_00995004
------------------------------------------
Foreground time interval of the image:
-0.640 0.284 (delta_t = 0.924 [sec])
Background time interval of the image:
-239.768 -0.640 (delta_t = 239.128 [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 -0.640 sec. to 0.284 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.679720 ( -0.26377 0.244516 )
Norm@50keV : 1.38030E-02 ( -0.00199798 0.00192303 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 40.31 using 59 PHA bins.
# Reduced chi-squared = 0.7072 for 57 degrees of freedom
# Null hypothesis probability = 9.539625e-01
Photon flux (15-150 keV) in 0.924 sec: 1.59818 ( -0.210416 0.21136 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.5712e-07 ( -2.04985e-08 2.0595e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.640 sec. to 0.284 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.668872 ( -0.264394 0.24946 )
Epeak [keV] : 9999.36 ( -9999.36 -9999.36 )
Norm@50keV : 1.38481E-02 ( -0.00181607 0.00741134 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 40.35 using 59 PHA bins.
# Reduced chi-squared = 0.7205 for 56 degrees of freedom
# Null hypothesis probability = 9.429389e-01
Photon flux (15-150 keV) in 0.924 sec: 1.60274 ( -0.21567 0.2069 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.57147e-07 ( -2.05156e-08 2.01543e-08 ) ergs/cm2
Band function
Time interval is from -0.640 sec. to 0.284 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.862457 ( 0.862449 0.862449 )
beta : -0.679713 ( -0.244577 0.263772 )
Epeak [keV] : 13.9365 ( -13.9366 -13.9366 )
Norm@50keV : 2.06109E-02 ( -0.00843472 268135 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 40.31 using 59 PHA bins.
# Reduced chi-squared = 0.7329 for 55 degrees of freedom
# Null hypothesis probability = 9.311252e-01
Photon flux (15-150 keV) in 0.924 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] : 33.1297 (-6.52949 9.79975)
R^2/D10^2 : 1.83559E-02 (-0.00903895 0.0156181)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 53.25 using 59 PHA bins.
# Reduced chi-squared = 0.9341 for 57 degrees of freedom
# Null hypothesis probability = 6.166782e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.734e-09 7.484e-10
25- 50 1.753e-08 4.574e-09
50-150 1.299e-07 2.921e-08
15-150 1.501e-07 3.525e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 200.000 (-23.8006 -200)
Norm : 6.36249 (-0.875732 0.875732)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 76.48 using 59 PHA bins.
# Reduced chi-squared = 1.342 for 57 degrees of freedom
# Null hypothesis probability = 4.353515e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.463e-08 8.270e-09
25- 50 2.815e-08 1.589e-08
50-150 6.173e-08 3.453e-08
15-150 1.045e-07 5.867e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 6.95899 (-2.98892 5.11527)
R1^2/D10^2 : 1.12544 (-0.943734 9.26333)
kT2 [keV] : 48.7099 (-14.7801 91.5173)
R2^2/D10^2 : 6.25464E-03 (-0.00534273 0.0100061)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 39.08 using 59 PHA bins.
# Reduced chi-squared = 0.7106 for 55 degrees of freedom
# Null hypothesis probability = 9.484118e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 9.568e-09 5.459e-09
25- 50 2.186e-08 1.103e-08
50-150 1.324e-07 7.183e-08
15-150 1.639e-07 7.947e-08
Peak spectrum fit
Power-law model
Time interval is from -0.676 sec. to 0.324 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.636497 ( -0.263489 0.243282 )
Norm@50keV : 1.29406E-02 ( -0.00192125 0.00184724 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 43.96 using 59 PHA bins.
# Reduced chi-squared = 0.7713 for 57 degrees of freedom
# Null hypothesis probability = 8.970727e-01
Photon flux (15-150 keV) in 1 sec: 1.50463 ( -0.199492 0.200589 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.62642e-07 ( -2.10765e-08 2.11721e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.676 sec. to 0.324 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.627284 ( -0.651958 0.344469 )
Epeak [keV] : 9999.34 ( -9999.35 -9999.35 )
Norm@50keV : 1.30419E-02 ( -0.00177679 0.00958094 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 43.99 using 59 PHA bins.
# Reduced chi-squared = 0.7855 for 56 degrees of freedom
# Null hypothesis probability = 8.778026e-01
Photon flux (15-150 keV) in 1 sec: 1.50761 ( -0.20232 0.19704 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.62559e-07 ( -2.0965e-08 2.1113e-08 ) ergs/cm2
Band function
Time interval is from -0.676 sec. to 0.324 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.832868 ( 0.832938 0.832938 )
beta : -0.636507 ( -0.243234 0.263488 )
Epeak [keV] : 13.9739 ( -13.9727 -13.9727 )
Norm@50keV : 1.95043E-02 ( -0.00829106 0 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 43.96 using 59 PHA bins.
# Reduced chi-squared = 0.7993 for 55 degrees of freedom
# Null hypothesis probability = 8.571181e-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] : 33.4584 (-6.42232 9.59932)
R^2/D10^2 : 1.70932E-02 (-0.00826455 0.0139598)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 54.01 using 59 PHA bins.
# Reduced chi-squared = 0.9476 for 57 degrees of freedom
# Null hypothesis probability = 5.879297e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.793e-09 8.835e-10
25- 50 1.797e-08 4.720e-09
50-150 1.351e-07 3.178e-08
15-150 1.558e-07 3.470e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 200.000 (-22.8386 -200)
Norm : 5.96934 (-0.835306 0.835306)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 83.84 using 59 PHA bins.
# Reduced chi-squared = 1.471 for 57 degrees of freedom
# Null hypothesis probability = 1.186271e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.487e-08 8.425e-09
25- 50 2.860e-08 1.590e-08
50-150 6.272e-08 3.532e-08
15-150 1.062e-07 5.950e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 6.92896 (-3.12476 5.99746)
R1^2/D10^2 : 0.957841 (-0.839173 6.26546)
kT2 [keV] : 45.8919 (-12.9369 71.5658)
R2^2/D10^2 : 6.97178E-03 (-0.00600147 0.0100391)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 43.13 using 59 PHA bins.
# Reduced chi-squared = 0.7841 for 55 degrees of freedom
# Null hypothesis probability = 8.771445e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 9.021e-09 5.087e-09
25- 50 2.193e-08 1.083e-08
50-150 1.373e-07 7.414e-08
15-150 1.682e-07 7.872e-08
Plot creation:
Tue Sep 8 16:19:22 EDT 2020