batgrbproduct analysis for trigger=997024
batgrbproduct Analysis for Trigger=997024
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 22 19:41:21 EDT 2020
Host Name: bat1
Current Working Dir: /local/data/bat1/prebascript/trigger997024/batgroup_hand_proc
======================================================================
Trigger: 00997024 Segment: 000
BAT Trigger Time: 622469232.268 [s; MET]
Trigger Stop: 622469232.332 [s; MET]
UTC: 2020-09-22T12:06:46.589360 [includes UTCF correction]
Where From?: (*SHORT BURST*) TDRSS scaled map message
BAT
RA: 296.914828354746 Dec: -55.2037522798755 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 10.54
Image Trigger?: NO
Rate S/N Ratio: 8.77496438739212 [ if not an image trigger ]
Image S/N Ratio: 10.54
Flight Position: [ source = BAT ]
RA: 296.914828354746 Dec: -55.2037522798755 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 296.954332155103 Dec: -55.1986309098766 [deg; J2000]
{ 19h 47m 49.0s , -55d 11' 55.1" }
+/- 0.65655215891431 [arcmin] (estimated 90% radius based on SNR)
+/- 0.16735597582187 [arcmin] (formal 1-sigma fit error)
SNR: 55.4833061224455
Angular difference between Flight and Ground position is 1.387144 arcmin
Partial Coding Fraction: 0.7421875 [ including projection effects ]
Duration
T90: 10.3039999008179 +/- 1.95544370890246
Measured from: -0.73199999332428
to: 9.57199990749359 [s; relative to TRIGTIME]
T50: 2.8199999332428 +/- 0.154505711027111
Measured from: 0.103999972343445
to: 2.92399990558624 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: -0.460000038146973
to: 0.539999961853027 [s; relative to TRIGTIME]
Total Fluence
Measured from: -1.91200006008148
to: 16.2239999771118 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 1.955026 2.182004 1.050148 0.183449
0.041585 0.043075 0.035682 0.027095 [error]
Peak 0.373792 0.528878 0.355814 0.056828
0.013950 0.016165 0.013865 0.007879 [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 7.19e-07 9.06e-07 8.32e-07 1.34e-06 2.91e-06 3.79e-06 erg/cm2
Error 3.60e-08 2.69e-08 3.61e-08 1.22e-07 8.64e-08 1.53e-07 erg/cm2
Peak flux Power-law 4.35e+00 3.82e+00 2.30e+00 2.09e+00 1.14e+01 1.25e+01 ph/cm2/s
Error 2.80e-01 1.55e-01 1.11e-01 2.00e-01 4.56e-01 4.76e-01 ph/cm2/s
Fluence Cutoff-PL 6.35e-07 9.54e-07 8.44e-07 5.56e-07 2.76e-06 2.99e-06 erg/cm2
Error 4.52e-08 3.22e-08 3.96e-08 1.63e-07 1.02e-07 1.96e-07 erg/cm2
Peak flux Cutoff-PL 3.63e+00 4.07e+00 2.50e+00 1.01e+00 1.09e+01 1.12e+01 ph/cm2/s
Error 3.45e-01 1.81e-01 1.35e-01 2.36e-01 4.76e-01 5.44e-01 ph/cm2/s
Fluence Band 6.13e-07 9.63e-07 8.17e-07 9.10e-07 2.76e-06 3.31e-06 erg/cm2
Error 5.59e-08 -------- 5.11e-08 -------- -------- -------- erg/cm2
Peak flux Band 3.68e+00 4.04e+00 2.50e+00 1.10e+00 1.09e+01 1.13e+01 ph/cm2/s
Error 3.41e-01 -------- 1.17e-01 -------- 4.79e-01 -------- ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 2.123 0.057 - - 1.72e-02 5.46e-04 76.500 57
CPL 1.433 0.260 39.3 5.7 3.88e-02 1.20e-02 52.480 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.731 0.064 - - 8.45e-02 3.30e-03 79.050 57
CPL 0.873 0.295 68.6 8.4 2.21e-01 7.36e-02 49.760 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: 4.608000 sec.
T50 in the 50-300 keV band: 1.792000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 18.136 -1.912 16.224
T90 10.304 -0.732 9.572
T50 2.820 0.104 2.924
Peak 1.000 -0.460 0.540
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
296.9543 -55.1986 0.0035 33.0 1.6 5.1943 55.5 TRIG_00997024
------------------------------------------
Foreground time interval of the image:
-1.912 10.833 (delta_t = 12.745 [sec])
Background time interval of the image:
-20.167 -1.912 (delta_t = 18.255 [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 -1.912 sec. to 16.224 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.12322 ( -0.0563995 0.0570497 )
Norm@50keV : 1.72424E-02 ( -0.000546645 0.000544476 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 76.50 using 59 PHA bins.
# Reduced chi-squared = 1.342 for 57 degrees of freedom
# Null hypothesis probability = 4.340651e-02
Photon flux (15-150 keV) in 18.14 sec: 2.74420 ( -0.0895698 0.0899852 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.91292e-06 ( -8.63667e-08 8.64665e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -1.912 sec. to 16.224 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.43282 ( -0.267588 0.252177 )
Epeak [keV] : 39.2989 ( -6.7907 4.67971 )
Norm@50keV : 3.88031E-02 ( -0.0097877 0.014155 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 52.48 using 59 PHA bins.
# Reduced chi-squared = 0.9371 for 56 degrees of freedom
# Null hypothesis probability = 6.090235e-01
Photon flux (15-150 keV) in 18.14 sec: 2.59649 ( -0.10108 0.10182 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.75648e-06 ( -1.01566e-07 1.01802e-07 ) ergs/cm2
Band function
Time interval is from -1.912 sec. to 16.224 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.43272 ( -0.267317 0.255324 )
beta : -10.0000 ( 10 1.77636e-15 )
Epeak [keV] : 39.2917 ( -6.78925 4.06909 )
Norm@50keV : 3.88020E-02 ( -0.00979268 0.0141528 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 52.48 using 59 PHA bins.
# Reduced chi-squared = 0.9541 for 55 degrees of freedom
# Null hypothesis probability = 5.716316e-01
Photon flux (15-150 keV) in 18.14 sec: 2.61270 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 2.76182e-06 ( 0 0 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 11.3182 ( )
R^2/D10^2 : 0.727118 ( )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 245.96 using 59 PHA bins.
# Reduced chi-squared = 4.3151 for 57 degrees of freedom
# Null hypothesis probability = 2.576441e-25
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.549e-07 2.095e-08
25- 50 1.040e-06 3.428e-08
50-150 7.691e-07 5.079e-08
15-150 2.164e-06 6.349e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 64.1384 (-5.13214 5.82059)
Norm : 13.4302 (-0.72461 0.771231)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 52.90 using 59 PHA bins.
# Reduced chi-squared = 0.9281 for 57 degrees of freedom
# Null hypothesis probability = 6.296090e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 6.184e-07 2.739e-08
25- 50 9.602e-07 3.184e-08
50-150 1.153e-06 7.229e-08
15-150 2.732e-06 9.251e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 6.58450 (-0.731439 0.729237)
R1^2/D10^2 : 4.12809 (-1.2524 2.19275)
kT2 [keV] : 19.6357 (-2.14557 2.80044)
R2^2/D10^2 : 5.64983E-02 (-0.0249258 0.0386538)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 59.74 using 59 PHA bins.
# Reduced chi-squared = 1.086 for 55 degrees of freedom
# Null hypothesis probability = 3.074422e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.640e-07 5.433e-08
25- 50 9.684e-07 6.712e-08
50-150 1.154e-06 1.324e-07
15-150 2.687e-06 2.086e-07
Peak spectrum fit
Power-law model
Time interval is from -0.460 sec. to 0.540 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.73144 ( -0.0635888 0.0643124 )
Norm@50keV : 8.45416E-02 ( -0.00330197 0.00329559 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 79.05 using 59 PHA bins.
# Reduced chi-squared = 1.387 for 57 degrees of freedom
# Null hypothesis probability = 2.827411e-02
Photon flux (15-150 keV) in 1 sec: 11.3542 ( -0.455701 0.456538 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.80985e-07 ( -3.14027e-08 3.14533e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.460 sec. to 0.540 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.872550 ( -0.304566 0.286312 )
Epeak [keV] : 68.6291 ( -6.56049 10.3124 )
Norm@50keV : 0.221043 ( -0.0594209 0.0876973 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 49.76 using 59 PHA bins.
# Reduced chi-squared = 0.8886 for 56 degrees of freedom
# Null hypothesis probability = 7.086677e-01
Photon flux (15-150 keV) in 1 sec: 10.8772 ( -0.4752 0.4774 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.52573e-07 ( -3.3256e-08 3.3226e-08 ) ergs/cm2
Band function
Time interval is from -0.460 sec. to 0.540 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.872493 ( -0.281042 0.302789 )
beta : -10.0000 ( 10 6.75016e-14 )
Epeak [keV] : 68.6162 ( -6.16797 10.3363 )
Norm@50keV : 0.221047 ( -0.0594534 0.087746 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 49.76 using 59 PHA bins.
# Reduced chi-squared = 0.9047 for 55 degrees of freedom
# Null hypothesis probability = 6.744875e-01
Photon flux (15-150 keV) in 1 sec: 10.9328 ( -3.9328 -0.5456 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.5264e-07 ( -7.52633e-07 -3.3851e-08 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 14.3089 ( )
R^2/D10^2 : 1.48425 ( )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 157.50 using 59 PHA bins.
# Reduced chi-squared = 2.7632 for 57 degrees of freedom
# Null hypothesis probability = 2.342400e-11
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 6.405e-08 4.620e-09
25- 50 2.434e-07 1.170e-08
50-150 3.317e-07 2.545e-08
15-150 6.391e-07 2.925e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 130.200 (-18.6379 21.2522)
Norm : 47.6414 (-2.261 2.59907)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 55.70 using 59 PHA bins.
# Reduced chi-squared = 0.9772 for 57 degrees of freedom
# Null hypothesis probability = 5.239892e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.213e-07 8.150e-09
25- 50 2.211e-07 1.290e-08
50-150 4.166e-07 1.037e-07
15-150 7.590e-07 1.105e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 6.47536 (-1.12209 1.25531)
R1^2/D10^2 : 13.9173 (-6.12301 13.95)
kT2 [keV] : 20.4602 (-1.97068 2.72071)
R2^2/D10^2 : 0.313008 (-0.131724 0.171795)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 52.32 using 59 PHA bins.
# Reduced chi-squared = 0.9512 for 55 degrees of freedom
# Null hypothesis probability = 5.778530e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.109e-07 1.957e-08
25- 50 2.271e-07 2.420e-08
50-150 4.063e-07 4.535e-08
15-150 7.443e-07 8.465e-08
Plot creation:
Tue Sep 22 19:49:22 EDT 2020