batgrbproduct analysis for trigger=843122
batgrbproduct Analysis for Trigger=843122
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 v2.46
Process Start Time (local time): Thu Jun 21 06:53:24 EDT 2018
Host Name: bat1
Current Working Dir: /local/data/bat1/prebascript/trigger843122/GCN5_download_cron
======================================================================
Trigger: 00843122 Segment: 000
BAT Trigger Time: 551176519.168 [s; MET]
Trigger Stop: 551176520.192 [s; MET]
UTC: 2018-06-20T08:34:58.033100 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 279.883065240736 Dec: 23.2653066773561 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 9.35
Image Trigger?: NO
Rate S/N Ratio: 15.2970585407784 [ if not an image trigger ]
Image S/N Ratio: 9.35
Flight Position: [ source = BAT ]
RA: 279.883065240736 Dec: 23.2653066773561 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 279.889735262414 Dec: 23.2383365236616 [deg; J2000]
{ 18h 39m 33.5s , +23d 14' 18.0" }
+/- 0.805497509983091 [arcmin] (estimated 90% radius based on SNR)
+/- 0.227822041098518 [arcmin] (formal 1-sigma fit error)
SNR: 41.4297561205348
Angular difference between Flight and Ground position is 1.659458 arcmin
Partial Coding Fraction: 0.421875 [ including projection effects ]
Duration
T90: 23.2359999418259 +/- 4.88428169129068
Measured from: -0.563999891281128
to: 22.6720000505447 [s; relative to TRIGTIME]
T50: 7.25599992275238 +/- 0.232000046762939
Measured from: 5.24000012874603
to: 12.4960000514984 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 4.46800005435944
to: 5.46800005435944 [s; relative to TRIGTIME]
Total Fluence
Measured from: -6.92400002479553
to: 37.0839999914169 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 2.830142 3.628840 2.363489 0.652047
0.069628 0.074065 0.065528 0.055492 [error]
Peak 0.247160 0.341823 0.253795 0.078021
0.014158 0.015749 0.014092 0.010147 [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 9.79e-07 1.57e-06 1.91e-06 4.54e-06 5.76e-06 8.99e-06 erg/cm2
Error 5.14e-08 4.72e-08 7.01e-08 3.74e-07 1.66e-07 4.17e-07 erg/cm2
Peak flux Power-law 2.63e+00 2.56e+00 1.75e+00 1.87e+00 7.69e+00 8.80e+00 ph/cm2/s
Error 2.49e-01 1.46e-01 1.19e-01 2.64e-01 4.19e-01 4.64e-01 ph/cm2/s
Fluence Cutoff-PL 9.41e-07 1.59e-06 1.93e-06 3.47e-06 5.67e-06 7.93e-06 erg/cm2
Error 6.53e-08 5.25e-08 7.46e-08 -------- 1.92e-07 9.38e-07 erg/cm2
Peak flux Cutoff-PL 2.60e+00 2.57e+00 1.75e+00 1.76e+00 7.67e+00 8.68e+00 ph/cm2/s
Error 2.17e-01 1.57e-01 1.27e-01 4.45e-01 4.33e-01 4.95e-01 ph/cm2/s
Fluence Band 8.92e-07 1.62e-06 1.89e-06 4.12e-06 5.64e-06 8.55e-06 erg/cm2
Error -------- 6.01e-08 7.23e-08 5.12e-07 1.39e-07 5.48e-07 erg/cm2
Peak flux Band 2.41e+00 2.49e+00 1.82e+00 2.13e+00 7.55e+00 8.85e+00 ph/cm2/s
Error 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.721 0.053 - - 1.41e-02 3.94e-04 71.500 57
CPL 1.535 0.210 128.7 -42.9 1.74e-02 3.97e-03 69.110 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.554 0.096 - - 6.07e-02 3.26e-03 71.160 57
CPL 1.523 0.234 787.8 0.0 6.29e-02 1.70e-02 71.130 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: 13.952000 sec.
T50 in the 50-300 keV band: 6.336000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 44.008 -6.924 37.084
T90 23.236 -0.564 22.672
T50 7.256 5.240 12.496
Peak 1.000 4.468 5.468
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
279.8897 +23.2383 0.0046 31.3 49.2 9.8723 41.4 TRIG_00843122
------------------------------------------
Foreground time interval of the image:
-6.924 37.084 (delta_t = 44.008 [sec])
Background time interval of the image:
-41.667 -6.924 (delta_t = 34.743 [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 -6.924 sec. to 37.084 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.72144 ( -0.0533465 0.0535631 )
Norm@50keV : 1.41490E-02 ( -0.000394574 0.000394143 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 71.50 using 59 PHA bins.
# Reduced chi-squared = 1.254 for 57 degrees of freedom
# Null hypothesis probability = 9.367235e-02
Photon flux (15-150 keV) in 44.01 sec: 1.89343 ( -0.0577066 0.057916 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.75624e-06 ( -1.65819e-07 1.66129e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -6.924 sec. to 37.084 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.53451 ( -0.216479 0.20342 )
Epeak [keV] : 128.663 ( -42.9287 -128.671 )
Norm@50keV : 1.74105E-02 ( -0.00334141 0.00459987 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 69.11 using 59 PHA bins.
# Reduced chi-squared = 1.234 for 56 degrees of freedom
# Null hypothesis probability = 1.120699e-01
Photon flux (15-150 keV) in 44.01 sec: 1.86514 ( -0.0648 0.06508 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.67086e-06 ( -1.92236e-07 1.91443e-07 ) ergs/cm2
Band function
Time interval is from -6.924 sec. to 37.084 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.02907 ( -0.5305 5.82373 )
beta : -1.81069 ( 1.81105 0.0928109 )
Epeak [keV] : 53.1917 ( -28.8896 98.5971 )
Norm@50keV : 3.57838E-02 ( -0.0199077 102.606 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 66.62 using 59 PHA bins.
# Reduced chi-squared = 1.211 for 55 degrees of freedom
# Null hypothesis probability = 1.353914e-01
Photon flux (15-150 keV) in 44.01 sec: 1.84035 ( 5.15965 -0.07012 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.64274e-06 ( -5.64243e-06 -1.85722e-07 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 14.0611 ( )
R^2/D10^2 : 0.243815 ( )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 357.04 using 59 PHA bins.
# Reduced chi-squared = 6.2638 for 57 degrees of freedom
# Null hypothesis probability = 5.069251e-45
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.480e-07 2.480e-08
25- 50 1.673e-06 5.875e-08
50-150 2.183e-06 1.276e-07
15-150 4.305e-06 1.314e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 142.440 (-20.2344 19.5053)
Norm : 7.65406 (-0.266663 0.349102)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 72.79 using 59 PHA bins.
# Reduced chi-squared = 1.277 for 57 degrees of freedom
# Null hypothesis probability = 7.755047e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 8.688e-07 5.083e-08
25- 50 1.598e-06 8.318e-08
50-150 3.086e-06 6.932e-07
15-150 5.553e-06 7.812e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 7.50825 (-0.682935 0.705525)
R1^2/D10^2 : 1.69195 (-0.443711 0.669986)
kT2 [keV] : 27.5566 (-3.02465 4.0457)
R2^2/D10^2 : 1.60896E-02 (-0.00622584 0.00876506)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 73.56 using 59 PHA bins.
# Reduced chi-squared = 1.337 for 55 degrees of freedom
# Null hypothesis probability = 4.804677e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 8.096e-07 7.548e-08
25- 50 1.653e-06 1.069e-07
50-150 3.143e-06 3.160e-07
15-150 5.606e-06 4.357e-07
Peak spectrum fit
Power-law model
Time interval is from 4.468 sec. to 5.468 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.55392 ( -0.0951143 0.0958955 )
Norm@50keV : 6.06581E-02 ( -0.00326953 0.00325975 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 71.16 using 59 PHA bins.
# Reduced chi-squared = 1.248 for 57 degrees of freedom
# Null hypothesis probability = 9.834481e-02
Photon flux (15-150 keV) in 1 sec: 7.68768 ( -0.418865 0.419783 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.70726e-07 ( -3.32662e-08 3.34063e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 4.468 sec. to 5.468 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.52255 ( -0.342011 0.125106 )
Epeak [keV] : 787.774 ( -787.774 -787.774 )
Norm@50keV : 6.28599E-02 ( -0.0052527 0.0287944 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 71.13 using 59 PHA bins.
# Reduced chi-squared = 1.270 for 56 degrees of freedom
# Null hypothesis probability = 8.382888e-02
Photon flux (15-150 keV) in 1 sec: 7.66522 ( -0.42859 0.43698 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.69023e-07 ( -3.4688e-08 3.514e-08 ) ergs/cm2
Band function
Time interval is from 4.468 sec. to 5.468 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.995273 ( 1.3475 1.3475 )
beta : -1.59744 ( 1.58133 0.11648 )
Epeak [keV] : 58.2257 ( -58.6292 -58.6292 )
Norm@50keV : 0.139185 ( -0.0811175 0 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 70.66 using 59 PHA bins.
# Reduced chi-squared = 1.285 for 55 degrees of freedom
# Null hypothesis probability = 7.592495e-02
Photon flux (15-150 keV) in 1 sec: 7.54806 ( -0.54806 -7.54806 ) 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] : 14.7008 ( )
R^2/D10^2 : 0.894538 ( )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 183.32 using 59 PHA bins.
# Reduced chi-squared = 3.2162 for 57 degrees of freedom
# Null hypothesis probability = 3.511429e-15
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.060e-08 4.185e-09
25- 50 1.583e-07 1.080e-08
50-150 2.307e-07 2.610e-08
15-150 4.296e-07 2.795e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 200.000 (-39.7833 -200)
Norm : 31.1653 (-1.63525 1.63525)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 73.10 using 59 PHA bins.
# Reduced chi-squared = 1.283 for 57 degrees of freedom
# Null hypothesis probability = 7.395506e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 7.773e-08 4.420e-09
25- 50 1.495e-07 9.550e-09
50-150 3.279e-07 2.580e-08
15-150 5.551e-07 3.640e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 7.18658 (-0.91759 0.986798)
R1^2/D10^2 : 7.98754 (-2.87734 5.03928)
kT2 [keV] : 30.3192 (-4.52647 6.62711)
R2^2/D10^2 : 5.82289E-02 (-0.027774 0.0437722)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 66.38 using 59 PHA bins.
# Reduced chi-squared = 1.207 for 55 degrees of freedom
# Null hypothesis probability = 1.399273e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 7.637e-08 1.290e-08
25- 50 1.496e-07 2.085e-08
50-150 3.511e-07 7.085e-08
15-150 5.771e-07 1.111e-07
Plot creation:
Thu Jun 21 06:58:37 EDT 2018