batgrbproduct analysis for trigger=823014
batgrbproduct Analysis for Trigger=823014
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): Sun Apr 8 07:04:36 EDT 2018
Host Name: bat1
Current Working Dir: /local/data/bat1/prebascript/trigger823014/GCN5_download_cron
======================================================================
Trigger: 00823014 Segment: 000
BAT Trigger Time: 544766739.008 [s; MET]
Trigger Stop: 544766740.032 [s; MET]
UTC: 2018-04-07T04:05:18.262140 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 209.937846998469 Dec: 48.6535260416956 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 6.69
Image Trigger?: NO
Rate S/N Ratio: 16.1554944214035 [ if not an image trigger ]
Image S/N Ratio: 6.69
Flight Position: [ source = BAT ]
RA: 209.937846998469 Dec: 48.6535260416956 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 210.197804202663 Dec: 48.72158027165 [deg; J2000]
{ 14h 00m 47.5s , +48d 43' 17.7" }
+/- 9.26221603500178 [arcmin] (estimated 90% radius based on SNR)
+/- 7.00599069994528 [arcmin] (formal 1-sigma fit error)
SNR: 1.26501910678331
Angular difference between Flight and Ground position is 11.076934 arcmin
Partial Coding Fraction: 0.9765625 [ including projection effects ]
Duration
T90: 52.4480000734329 +/- 33.857316606448
Measured from: 0.104000091552734
to: 52.5520001649857 [s; relative to TRIGTIME]
T50: 33.9680000543594 +/- 26.3017858326978
Measured from: 5.94400012493134
to: 39.9120001792908 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: -0.00400006771087646
to: 0.995999932289124 [s; relative to TRIGTIME]
Total Fluence
Measured from: -0.296000003814697
to: 54.3279999494553 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.049976 -0.053047 -0.061645 0.164600
0.048943 0.053933 0.054829 0.062495 [error]
Peak 0.012162 0.004856 0.016231 0.040284
0.006007 0.006490 0.006387 0.007050 [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 0.00e+00 0.00e+00 0.00e+00 0.00e+001.51e-06 0.00e+009.90e-08 0.00e+001.69e-06 erg/cm2
Error 1.52e-08 1.18e-08 3.43e-08 2.28e-06 1.20e-07 2.30e-06 erg/cm2
Peak flux Power-law 8.39e-04 6.80e-03 4.91e-02 1.97e+00 1.81e-01 2.03e+00 ph/cm2/s
Error 1.26e-02 3.25e-02 7.22e-02 9.57e-01 1.71e-01 9.98e-01 ph/cm2/s
Fluence Cutoff-PL 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 erg/cm2
Error 2.38e-08 1.52e-08 3.62e-08 -------- 1.38e-07 4.38e-05 erg/cm2
Peak flux Cutoff-PL -------- -------- -------- -------- -------- -------- ph/cm2/s
Error -------- -------- -------- -------- -------- -------- ph/cm2/s
Fluence Band 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 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 1.500 0.000 - - 0.00e+00 8.90e-05 52.930 57
CPL 1.000 0.000 50.0 0.0 0.00e+00 0.00e+00 52.930 56
The chi2 of BB fit is which shows a significant improvement in the fit over a PL.
Check the BB fit.
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL -1.851 1.154 - - 4.50e-04 1.33e-03 74.970 57
CPL -2.750 1.561 9999.9 0.0 1.82e-04 1.24e-03 74.580 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: 0.000000 sec.
T50 in the 50-300 keV band: 0.000000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 54.624 -0.296 54.328
T90 52.448 0.104 52.552
T50 33.968 5.944 39.912
Peak 1.000 -0.004 0.996
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
210.1978 +48.7216 0.1527 17.7 22.9 0.0733 1.3 TRIG_00823014
------------------------------------------
Foreground time interval of the image:
-0.296 15.093 (delta_t = 15.389 [sec])
Background time interval of the image:
-60.008 -0.296 (delta_t = 59.712 [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 -0.296 sec. to 54.328 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.50000 ( -1.5 -1.5 )
Norm@50keV : 0.0 ( 0 0.000178069 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 52.93 using 59 PHA bins.
# Reduced chi-squared = 0.9285 for 57 degrees of freedom
# Null hypothesis probability = 6.286039e-01
Photon flux (15-150 keV) in 54.62 sec: 0.0 ( 0 0.0257431 ) ph/cm2/s
Energy fluence (15-150 keV) : 0 ( -9.64272e-08 1.42905e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.296 sec. to 54.328 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.00000 ( )
Epeak [keV] : 50.0000 ( )
Norm@50keV : 0.0 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 52.93 using 59 PHA bins.
# Reduced chi-squared = 0.9451 for 56 degrees of freedom
# Null hypothesis probability = 5.919607e-01
Photon flux (15-150 keV) in 54.62 sec: 0.0 8.51990E-03 7.73338E-03 7.24216E-03 7.13534E-04 6.02277E-04 4.85232E-04 1.88040E-04 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 0 ( 0 0 ) ergs/cm2
Band function
Time interval is from -0.296 sec. to 54.328 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -7.46846 ( 0.98395 0.98395 )
beta : 1.52652 ( 2.5 2.5 )
Epeak [keV] : 5.17011 ( -80 -80 )
Norm@50keV : 4.23597E-03 ( -0.00443318 0.0134857 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 51.48 using 59 PHA bins.
# Reduced chi-squared = 0.9360 for 55 degrees of freedom
# Null hypothesis probability = 6.099130e-01
Photon flux (15-150 keV) in 54.62 sec: 0.0 ( ) 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] : 3.76123 (-3.7582 -3.7582)
R^2/D10^2 : 0.367048 (-0.369454 -0.369454)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 51.94 using 59 PHA bins.
# Reduced chi-squared = 0.9113 for 57 degrees of freedom
# Null hypothesis probability = 6.647415e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.342e-08 9.545e-09
25- 50 4.051e-09 4.454e-09
50-150 3.356e-11 3.605e-11
15-150 1.751e-08 1.142e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 7.91088 (-7.91086 -7.91086)
Norm : 0.476100 (-0.476073 -0.476073)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 52.20 using 59 PHA bins.
# Reduced chi-squared = 0.9158 for 57 degrees of freedom
# Null hypothesis probability = 6.554518e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.098e-08 7.551e-09
25- 50 3.349e-09 3.736e-09
50-150 1.137e-10 1.600e-10
15-150 1.444e-08 1.094e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 3.75736 (-3.75729 -3.75729)
R1^2/D10^2 : 0.369327 (-0.36943 -0.36943)
kT2 [keV] : 0.102243 (-0.102243 -0.102243)
R2^2/D10^2 : 3.38429E-03 (-0.00338506 -0.00338506)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 51.94 using 59 PHA bins.
# Reduced chi-squared = 0.9444 for 55 degrees of freedom
# Null hypothesis probability = 5.921700e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 0.000e+00 0.000e+00
25- 50 0.000e+00 0.000e+00
50-150 0.000e+00 0.000e+00
15-150 0.000e+00 0.000e+00
Peak spectrum fit
Power-law model
Time interval is from -0.004 sec. to 0.996 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -1.85105 ( -0.471431 1.8373 )
Norm@50keV : 4.50047E-04 ( -0.000450055 0.00221447 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 74.97 using 59 PHA bins.
# Reduced chi-squared = 1.315 for 57 degrees of freedom
# Null hypothesis probability = 5.548549e-02
Photon flux (15-150 keV) in 1 sec: 0.180677 ( -0.129197 0.212963 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.21839e-08 ( -2.26757e-08 2.82956e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.004 sec. to 0.996 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -2.74975 ( -0.491749 2.62994 )
Epeak [keV] : 9999.94 ( -9999.94 -9999.94 )
Norm@50keV : 1.82349E-04 ( -0.000182349 0.00230221 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 74.58 using 59 PHA bins.
# Reduced chi-squared = 1.332 for 56 degrees of freedom
# Null hypothesis probability = 4.910830e-02
Photon flux (15-150 keV) in 1 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 0 ( 0 0 ) ergs/cm2
Band function
Time interval is from -0.004 sec. to 0.996 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 6.60683E-02 ( -0.0673126 -0.0673126 )
beta : 1.85094 ( -1.83871 0.471214 )
Epeak [keV] : 6.53400 ( -6.53553 -6.53553 )
Norm@50keV : 2.12768E-03 ( -0.00212842 8289.45 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 74.97 using 59 PHA bins.
# Reduced chi-squared = 1.363 for 55 degrees of freedom
# Null hypothesis probability = 3.798708e-02
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] : 200.000 (-200 -200)
R^2/D10^2 : 1.70894E-04 (-6.24651e-05 -0.000171349)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 76.36 using 59 PHA bins.
# Reduced chi-squared = 1.340 for 57 degrees of freedom
# Null hypothesis probability = 4.439870e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.020e-09 1.792e-09
25- 50 6.825e-10 5.410e-10
50-150 2.994e-12 3.379e-12
15-150 3.705e-09 2.139e-09
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 199.353 (-199.36 -199.36)
Norm : 1.14821 (-0.608529 0.610388)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 87.10 using 59 PHA bins.
# Reduced chi-squared = 1.528 for 57 degrees of freedom
# Null hypothesis probability = 6.286913e-03
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.859e-09 2.012e-09
25- 50 5.500e-09 3.878e-09
50-150 1.206e-08 8.620e-09
15-150 2.042e-08 1.447e-08
Double BB
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 2.98459 (-2.95712 -2.95712)
R1^2/D10^2 : 14.0145 (-14.0652 49.6842)
kT2 [keV] : 199.042 (-142.72 -199.049)
R2^2/D10^2 : 1.69064E-04 (-6.29549e-05 0.000774818)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 74.55 using 59 PHA bins.
#Fit statistic : Chi-Squared = 73.73 using 59 PHA bins.
# Reduced chi-squared = 1.356 for 55 degrees of freedom
# Reduced chi-squared = 1.341 for 55 degrees of freedom
# Null hypothesis probability = 4.073254e-02
# Null hypothesis probability = 4.669813e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.707e-09 1.504e-09
25- 50 2.571e-09 1.729e-09
50-150 4.384e-08 4.597e-08
15-150 4.912e-08 4.565e-08
Plot creation:
Sun Apr 8 07:09:14 EDT 2018