batgrbproduct analysis for trigger=1042398
batgrbproduct Analysis for Trigger=1042398
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): Mon Apr 12 14:47:43 EDT 2021
Host Name: batproc1
Current Working Dir: /local/data/bat1/prebascript/trigger1042398/batgroup_hand_proc
======================================================================
Trigger: 01042398 Segment: 000
BAT Trigger Time: 639846378.304 [s; MET]
Trigger Stop: 639846378.56 [s; MET]
UTC: 2021-04-11T15:05:51.476880 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 296.559356259681 Dec: -39.3728157586284 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 8.09
Image Trigger?: NO
Rate S/N Ratio: 14.6969384566991 [ if not an image trigger ]
Image S/N Ratio: 8.09
Flight Position: [ source = BAT ]
RA: 296.559356259681 Dec: -39.3728157586284 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 296.600848235238 Dec: -39.3993980329485 [deg; J2000]
{ 19h 46m 24.2s , -39d 23' 57.8" }
+/- 0.816412951808382 [arcmin] (estimated 90% radius based on SNR)
+/- 0.296611399998871 [arcmin] (formal 1-sigma fit error)
SNR: 40.6407206335685
Angular difference between Flight and Ground position is 2.499210 arcmin
Partial Coding Fraction: 0.796875 [ including projection effects ]
Duration
T90: 12.7999999523163 +/- 0.597059548109449
Measured from: 0.375999927520752
to: 13.175999879837 [s; relative to TRIGTIME]
T50: 6.89999997615814 +/- 0.352817353477939
Measured from: 3.51999998092651
to: 10.4199999570847 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 3.86800003051758
to: 4.86800003051758 [s; relative to TRIGTIME]
Total Fluence
Measured from: -0.448000073432922
to: 14.4399999380112 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 1.423221 1.093857 0.324685 0.031095
0.033766 0.032744 0.026179 0.023176 [error]
Peak 0.221874 0.232705 0.092486 0.010269
0.010849 0.011257 0.008187 0.006066 [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 4.62e-07 4.34e-07 2.83e-07 2.85e-07 1.30e-06 1.46e-06 erg/cm2
Error 2.86e-08 1.82e-08 2.34e-08 4.61e-08 5.58e-08 7.62e-08 erg/cm2
Peak flux Power-law 2.38e+00 1.55e+00 6.56e-01 3.79e-01 4.78e+00 4.97e+00 ph/cm2/s
Error 2.03e-01 9.35e-02 6.55e-02 7.02e-02 2.93e-01 2.99e-01 ph/cm2/s
Fluence Cutoff-PL 4.22e-07 4.69e-07 2.42e-07 5.57e-08 1.18e-06 1.19e-06 erg/cm2
Error 3.33e-08 2.34e-08 3.22e-08 3.83e-08 6.83e-08 8.03e-08 erg/cm2
Peak flux Cutoff-PL 2.14e+00 1.76e+00 6.22e-01 9.15e-02 4.60e+00 4.61e+00 ph/cm2/s
Error 2.30e-01 1.32e-01 8.30e-02 6.17e-02 3.02e-01 3.09e-01 ph/cm2/s
Fluence Band 4.10e-07 4.60e-07 2.51e-07 2.00e-07 1.21e-06 1.32e-06 erg/cm2
Error 3.64e-08 2.72e-08 3.30e-08 1.28e-07 6.41e-08 1.29e-07 erg/cm2
Peak flux Band 2.05e+00 1.81e+00 5.87e-01 2.28e-01 4.58e+00 4.68e+00 ph/cm2/s
Error 2.51e-01 1.40e-01 7.64e-02 7.94e-02 3.04e-01 3.16e-01 ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 2.618 0.092 - - 8.41e-03 4.95e-04 68.870 0
CPL 1.596 0.403 14.8 10.8 3.47e-02 2.51e-02 51.240 0
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 2.242 0.110 - - 2.82e-02 2.16e-03 83.280 0
CPL 1.043 0.585 32.0 6.4 1.43e-01 1.35e-01 0.153 0
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: 16.000000 sec.
T50 in the 50-300 keV band: 7.232000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 14.888 -0.448 14.440
T90 12.800 0.376 13.176
T50 6.900 3.520 10.420
Peak 1.000 3.868 4.868
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
296.6008 -39.3994 0.0047 14.7 83.9 2.6614 40.6 TRIG_01042398
------------------------------------------
Foreground time interval of the image:
-0.448 11.597 (delta_t = 12.045 [sec])
Background time interval of the image:
-60.304 -0.448 (delta_t = 59.856 [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 -0.448 sec. to 14.440 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.61780 ( -0.090963 0.0930543 )
Norm@50keV : 8.41139E-03 ( -0.000495977 0.000493375 )
------------------------------------------------------------
#Fit statistic : Chi-Squared 68.87 using 59 bins.
Reduced chi-squared =
# Null hypothesis probability of 1.35e-01 with 57 degrees of freedom
Photon flux (15-150 keV) in 14.89 sec: 1.77922 ( -0.0788644 0.0791972 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.29638e-06 ( -5.57057e-08 5.59277e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.448 sec. to 14.440 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.59578 ( -0.505499 0.301364 )
Epeak [keV] : 14.8169 ( -13.873 7.74371 )
Norm@50keV : 3.47018E-02 ( -0.0147289 0.0355229 )
------------------------------------------------------------
#Fit statistic : Chi-Squared 51.24 using 59 bins.
Reduced chi-squared =
# Null hypothesis probability of 6.55e-01 with 56 degrees of freedom
Photon flux (15-150 keV) in 14.89 sec: 1.67683 ( -0.08841 0.08878 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.1775e-06 ( -6.69097e-08 6.9709e-08 ) ergs/cm2
Band function
Time interval is from -0.448 sec. to 14.440 sec.
XSPEC12>exit
XSPEC: quit
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 1.11729 ( -2.14039 -0.471448 )
beta : -2.88084 ( 2.89623 0.175386 )
Epeak [keV] : 22.8202 ( -9.71691 2.50395 )
Norm@50keV : 3.77194 ( -3.76177 1643.6 )
------------------------------------------------------------
Photon flux (15-150 keV) in 14.89 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 1.21432e-06 ( -1.21422e-06 -6.40032e-08 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 7.71458 ( )
R^2/D10^2 : 2.02657 ( )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared 117.72 using 59 bins.
Reduced chi-squared =
# Null hypothesis probability of 4.09e-06 with 57 degrees of freedom
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.157e-07 2.375e-08
25- 50 5.182e-07 2.360e-08
50-150 1.206e-07 1.731e-08
15-150 9.545e-07 4.244e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 30.6418 (-2.79129 3.17756)
Norm : 13.4380 (-1.32326 1.49468)
------------------------------------------------------------
#Fit statistic : Chi-Squared 51.79 using 59 bins.
Reduced chi-squared =
# Null hypothesis probability of 6.70e-01 with 57 degrees of freedom
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.116e-07 2.583e-08
25- 50 4.758e-07 1.965e-08
50-150 2.679e-07 3.737e-08
15-150 1.155e-06 5.040e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 5.13266 (-0.674188 0.670714)
R1^2/D10^2 : 8.78517 (-3.2995 6.52237)
kT2 [keV] : 13.9943 (-2.23784 3.24965)
R2^2/D10^2 : 9.49530E-02 (-0.059598 0.129829)
------------------------------------------------------------
#Fit statistic : Chi-Squared 48.14 using 59 bins.
Reduced chi-squared =
# Null hypothesis probability of 7.32e-01 with 55 degrees of freedom
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.114e-07 6.068e-08
25- 50 4.632e-07 8.398e-08
50-150 2.917e-07 1.115e-07
15-150 1.166e-06 2.359e-07
Peak spectrum fit
Power-law model
Time interval is from 3.868 sec. to 4.868 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.24247 ( -0.108355 0.112081 )
Norm@50keV : 2.82140E-02 ( -0.00216852 0.00214517 )
------------------------------------------------------------
#Fit statistic : Chi-Squared 83.28 using 59 bins.
Reduced chi-squared =
# Null hypothesis probability of 1.32e-02 with 57 degrees of freedom
Photon flux (15-150 keV) in 1 sec: 4.77773 ( -0.293156 0.293409 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.66968e-07 ( -1.78402e-08 1.7963e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 3.868 sec. to 4.868 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.04329 ( -0.626806 0.543604 )
Epeak [keV] : 32.0460 ( -7.95167 4.80445 )
Norm@50keV : 0.143470 ( -0.0743903 0.196074 )
------------------------------------------------------------
#Fit statistic : Chi-Squared 66.79 using 59 bins.
Reduced chi-squared =
# Null hypothesis probability of 1.53e-01 with 56 degrees of freedom
Photon flux (15-150 keV) in 1 sec: 4.59810 ( -0.30193 0.3024 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.44353e-07 ( -1.9002e-08 1.9664e-08 ) ergs/cm2
Band function
Time interval is from 3.868 sec. to 4.868 sec.
XSPEC12>exit
XSPEC: quit
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 1.04215 ( -1.80236 3.37689 )
beta : -2.70855 ( -0.228432 0.254658 )
Epeak [keV] : 28.9966 ( -3.34145 3.75183 )
Norm@50keV : 4.32013 ( -3.8556 1524.46 )
------------------------------------------------------------
Photon flux (15-150 keV) in 1 sec: 4.57998 ( 2.42002 -0.30469 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.51402e-07 ( -2.51395e-07 -1.8558e-08 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 8.94076 (-0.574605 0.615122)
R^2/D10^2 : 3.39832 (-0.807295 1.05269)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared 99.08 using 59 bins.
Reduced chi-squared =
# Null hypothesis probability of 4.67e-04 with 57 degrees of freedom
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.271e-08 5.370e-09
25- 50 1.109e-07 7.500e-09
50-150 4.145e-08 7.200e-09
15-150 2.050e-07 1.400e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 46.4299 (-6.3204 7.75604)
Norm : 28.3423 (-3.04223 3.42307)
------------------------------------------------------------
#Fit statistic : Chi-Squared 67.36 using 59 bins.
Reduced chi-squared =
# Null hypothesis probability of 1.64e-01 with 57 degrees of freedom
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 6.805e-08 5.495e-09
25- 50 9.511e-08 5.585e-09
50-150 8.595e-08 1.354e-08
15-150 2.491e-07 1.815e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 6.26668 (-1.04153 1.02577)
R1^2/D10^2 : 10.2897 (-4.02631 8.44658)
kT2 [keV] : 17.3960 (-3.76669 7.1177)
R2^2/D10^2 : 0.128638 (-0.100132 0.282837)
------------------------------------------------------------
#Fit statistic : Chi-Squared 63.07 using 59 bins.
Reduced chi-squared =
# Null hypothesis probability of 2.12e-01 with 55 degrees of freedom
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 6.488e-08 1.331e-08
25- 50 9.789e-08 1.997e-08
50-150 8.403e-08 3.880e-08
15-150 2.468e-07 6.620e-08
Plot creation:
Mon Apr 12 14:56:57 EDT 2021