batgrbproduct analysis for trigger=848932
batgrbproduct Analysis for Trigger=848932
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): Sat Jul 21 19:53:07 EDT 2018
Host Name: bat1
Current Working Dir: /local/data/bat1/prebascript/trigger848932/GCN5_download_cron
======================================================================
Trigger: 00848932 Segment: 000
BAT Trigger Time: 553818258.944 [s; MET]
Trigger Stop: 553818259.968 [s; MET]
UTC: 2018-07-20T22:23:57.647680 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 265.623311909688 Dec: -26.5838055962637 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 9.38
Image Trigger?: NO
Rate S/N Ratio: 18.6010752377383 [ if not an image trigger ]
Image S/N Ratio: 9.38
Flight Position: [ source = BAT ]
RA: 265.623311909688 Dec: -26.5838055962637 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 265.654659122167 Dec: -26.6340305197687 [deg; J2000]
{ 17h 42m 37.1s , -26d 38' 02.5" }
+/- 1.65586677685622 [arcmin] (estimated 90% radius based on SNR)
+/- 0.595329287052358 [arcmin] (formal 1-sigma fit error)
SNR: 14.7987475612246
Angular difference between Flight and Ground position is 3.450944 arcmin
Partial Coding Fraction: 0.984375 [ including projection effects ]
Duration
T90: 124.155999898911 +/- 32.6784691171636
Measured from: -109.843999862671
to: 14.3120000362396 [s; relative to TRIGTIME]
T50: 27.9199999570847 +/- 39.3117186798345
Measured from: -23.1599998474121
to: 4.76000010967255 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: -0.26800000667572
to: 0.73199999332428 [s; relative to TRIGTIME]
Total Fluence
Measured from: -150.519999980927
to: 23.3359999656677 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.978883 1.373739 1.118366 0.316535
0.093316 0.086079 0.073563 0.064510 [error]
Peak 0.024859 0.052482 0.047703 0.027535
0.007509 0.007248 0.006485 0.005525 [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 2.86e-07 5.64e-07 8.63e-07 2.88e-06 2.42e-06 4.59e-06 erg/cm2
Error 3.74e-08 4.26e-08 7.31e-08 5.59e-07 1.79e-07 6.02e-07 erg/cm2
Peak flux Power-law 2.51e-01 3.38e-01 3.35e-01 5.98e-01 1.12e+00 1.52e+00 ph/cm2/s
Error 8.12e-02 6.49e-02 5.17e-02 2.13e-01 1.69e-01 2.38e-01 ph/cm2/s
Fluence Cutoff-PL 2.88e-07 5.66e-07 8.62e-07 2.84e-06 2.41e-06 4.55e-06 erg/cm2
Error 3.77e-08 4.21e-08 7.27e-08 8.10e-07 1.77e-07 6.71e-07 erg/cm2
Peak flux Cutoff-PL 2.54e-01 3.39e-01 3.35e-01 5.87e-01 1.12e+00 1.52e+00 ph/cm2/s
Error 6.79e-02 6.58e-02 5.58e-02 -------- 1.70e-01 3.22e-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 1.387 0.126 - - 1.43e-03 9.61e-05 51.030 57
CPL 1.388 0.172 9999.4 0.0 1.44e-03 3.06e-04 51.060 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.014 0.274 - - 9.72e-03 1.43e-03 55.600 57
CPL 1.011 0.278 9999.2 0.0 9.77e-03 8.50e-03 55.600 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: 22.528000 sec.
T50 in the 50-300 keV band: 11.008000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 173.856 -150.520 23.336
T90 124.156 -109.844 14.312
T50 27.920 -23.160 4.760
Peak 1.000 -0.268 0.732
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
265.6547 -26.6340 0.0129 19.2 -2.1 3.9989 14.8 TRIG_00848932
------------------------------------------
Foreground time interval of the image:
-150.520 15.257 (delta_t = 165.777 [sec])
Background time interval of the image:
-239.944 -173.664 (delta_t = 66.280 [sec])
-172.944 -150.520 (delta_t = 22.424 [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 -150.520 sec. to 23.336 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.38678 ( -0.126655 0.125666 )
Norm@50keV : 1.43462E-03 ( -9.61094e-05 9.60206e-05 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 51.03 using 59 PHA bins.
# Reduced chi-squared = 0.8953 for 57 degrees of freedom
# Null hypothesis probability = 6.972127e-01
Photon flux (15-150 keV) in 173.9 sec: 0.174193 ( -0.0122464 0.0122923 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.41726e-06 ( -1.7814e-07 1.79187e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -150.520 sec. to 23.336 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.38829 ( -0.221782 0.122898 )
Epeak [keV] : 9999.35 ( -9999.36 -9999.36 )
Norm@50keV : 1.43737E-03 ( -9.6128e-05 0.00051666 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 51.06 using 59 PHA bins.
# Reduced chi-squared = 0.9118 for 56 degrees of freedom
# Null hypothesis probability = 6.619653e-01
Photon flux (15-150 keV) in 173.9 sec: 0.174381 ( -0.012526 0.012037 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.41443e-06 ( -1.75587e-07 1.78282e-07 ) ergs/cm2
Band function
Time interval is from -150.520 sec. to 23.336 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 4.94168 ( -4.94168 -4.94168 )
beta : -1.44782 ( -0.142953 0.139879 )
Epeak [keV] : 24.4571 ( -8.00048 4.34178 )
Norm@50keV : 141.902 ( -9.45177 487870 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 48.87 using 59 PHA bins.
# Reduced chi-squared = 0.8885 for 55 degrees of freedom
# Null hypothesis probability = 7.066306e-01
Photon flux (15-150 keV) in 173.9 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] : 17.4088 ( )
R^2/D10^2 : 1.14980E-02 ( )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 124.08 using 59 PHA bins.
# Reduced chi-squared = 2.1769 for 57 degrees of freedom
# Null hypothesis probability = 6.940222e-07
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.226e-07 1.789e-08
25- 50 5.526e-07 6.156e-08
50-150 1.205e-06 1.522e-07
15-150 1.880e-06 1.761e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 200.000 (-23.9955 -200)
Norm : 0.720940 (-0.0484278 0.0484278)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 58.96 using 59 PHA bins.
# Reduced chi-squared = 1.034 for 57 degrees of freedom
# Null hypothesis probability = 4.037099e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.123e-07 2.774e-08
25- 50 6.007e-07 5.808e-08
50-150 1.317e-06 4.319e-07
15-150 2.230e-06 3.912e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 7.01061 (-1.05746 1.23711)
R1^2/D10^2 : 0.193671 (-0.0854128 0.161081)
kT2 [keV] : 34.1445 (-6.45399 11.0928)
R2^2/D10^2 : 1.07489E-03 (-0.000597742 0.00101142)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 44.01 using 59 PHA bins.
# Reduced chi-squared = 0.8002 for 55 degrees of freedom
# Null hypothesis probability = 8.559698e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.977e-07 6.565e-08
25- 50 5.692e-07 1.071e-07
50-150 1.635e-06 4.707e-07
15-150 2.502e-06 6.323e-07
Peak spectrum fit
Power-law model
Time interval is from -0.268 sec. to 0.732 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.01355 ( -0.281459 0.265992 )
Norm@50keV : 9.71504E-03 ( -0.00143336 0.00141937 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 55.60 using 59 PHA bins.
# Reduced chi-squared = 0.9754 for 57 degrees of freedom
# Null hypothesis probability = 5.278246e-01
Photon flux (15-150 keV) in 1 sec: 1.11913 ( -0.168387 0.169848 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.04566e-07 ( -1.61004e-08 1.62153e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.268 sec. to 0.732 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.01116 ( -0.290151 0.265376 )
Epeak [keV] : 9999.21 ( -9999.36 -9999.36 )
Norm@50keV : 9.76906E-03 ( -0.00141792 0.0155743 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 55.60 using 59 PHA bins.
# Reduced chi-squared = 0.9929 for 56 degrees of freedom
# Null hypothesis probability = 4.898626e-01
Photon flux (15-150 keV) in 1 sec: 1.12041 ( -0.172945 0.16689 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.04531e-07 ( -1.66267e-08 1.6165e-08 ) ergs/cm2
Band function
Time interval is from -0.268 sec. to 0.732 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.804320 ( 0.80432 5.80426 )
beta : -1.01355 ( 1.01355 0.281846 )
Epeak [keV] : 63.8871 ( -63.8871 -63.8871 )
Norm@50keV : 1.63843E-02 ( -0.00806045 0 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 55.60 using 59 PHA bins.
# Reduced chi-squared = 1.011 for 55 degrees of freedom
# Null hypothesis probability = 4.521017e-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] : 22.4778 (-4.54698 6.43298)
R^2/D10^2 : 3.60551E-02 (-0.0193025 0.0381902)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 66.09 using 59 PHA bins.
# Reduced chi-squared = 1.160 for 57 degrees of freedom
# Null hypothesis probability = 1.916608e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.338e-09 1.219e-09
25- 50 1.787e-08 4.670e-09
50-150 6.748e-08 1.918e-08
15-150 8.870e-08 2.389e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 200.000 (-38.7665 -200)
Norm : 4.67416 (-0.697207 0.697207)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 67.10 using 59 PHA bins.
# Reduced chi-squared = 1.177 for 57 degrees of freedom
# Null hypothesis probability = 1.693830e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.165e-08 6.630e-09
25- 50 2.240e-08 1.238e-08
50-150 4.914e-08 2.737e-08
15-150 8.319e-08 4.677e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 9.92685 (-3.7578 4.73299)
R1^2/D10^2 : 0.321443 (-0.224713 1.07809)
kT2 [keV] : 52.8244 (-24.6838 -52.8233)
R2^2/D10^2 : 2.56183E-03 (-0.00245331 0.00747062)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 54.64 using 59 PHA bins.
# Reduced chi-squared = 0.9935 for 55 degrees of freedom
# Null hypothesis probability = 4.882888e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 7.182e-09 4.214e-09
25- 50 2.130e-08 1.185e-08
50-150 7.849e-08 4.104e-08
15-150 1.070e-07 5.450e-08
Plot creation:
Sat Jul 21 19:59:30 EDT 2018