batgrbproduct analysis for trigger=894718
batgrbproduct Analysis for Trigger=894718
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): Mon Mar 25 19:31:41 EDT 2019
Host Name: bat1
Current Working Dir: /local/data/bat1/prebascript/trigger894718/GCN5_download_cron
======================================================================
Trigger: 00894718 Segment: 000
BAT Trigger Time: 575160264.256 [s; MET]
Trigger Stop: 575160266.304 [s; MET]
UTC: 2019-03-24T22:44:01.630420 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 49.5763772428907 Dec: -47.2395129362167 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 8.57
Image Trigger?: NO
Rate S/N Ratio: 13.1909059582729 [ if not an image trigger ]
Image S/N Ratio: 8.57
Flight Position: [ source = BAT ]
RA: 49.5763772428907 Dec: -47.2395129362167 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 49.6031952336192 Dec: -47.2118044651408 [deg; J2000]
{ 03h 18m 24.8s , -47d 12' 42.5" }
+/- 0.941841259967706 [arcmin] (estimated 90% radius based on SNR)
+/- 0.313740067875947 [arcmin] (formal 1-sigma fit error)
SNR: 33.1354655781538
Angular difference between Flight and Ground position is 1.989479 arcmin
Partial Coding Fraction: 0.5625 [ including projection effects ]
Duration
T90: 28.5120000839233 +/- 11.537667022283
Measured from: 17.5120000839233
to: 46.0240001678467 [s; relative to TRIGTIME]
T50: 6.32000005245209 +/- 0.41011214584303
Measured from: 21.0480000972748
to: 27.3680001497269 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 23.7400000095367
to: 24.7400000095367 [s; relative to TRIGTIME]
Total Fluence
Measured from: 0.0879999399185181
to: 83.3039999008179 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 2.810610 4.133970 3.243036 0.770136
0.095573 0.102748 0.092009 0.077044 [error]
Peak 0.348632 0.550551 0.438288 0.094370
0.017940 0.021382 0.019563 0.012192 [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 9.23e-07 1.74e-06 2.53e-06 7.83e-06 7.17e-06 1.30e-05 erg/cm2
Error 5.44e-08 5.96e-08 9.45e-08 6.63e-07 2.31e-07 7.17e-07 erg/cm2
Peak flux Power-law 3.70e+00 3.90e+00 2.91e+00 3.51e+00 1.19e+01 1.40e+01 ph/cm2/s
Error 2.94e-01 1.93e-01 1.58e-01 3.87e-01 5.48e-01 6.38e-01 ph/cm2/s
Fluence Cutoff-PL 8.78e-07 1.77e-06 2.58e-06 5.65e-06 7.06e-06 1.09e-05 erg/cm2
Error 6.77e-08 6.62e-08 1.05e-07 1.69e-06 2.56e-07 1.65e-06 erg/cm2
Peak flux Cutoff-PL 3.21e+00 4.11e+00 3.12e+00 1.90e+00 1.15e+01 1.23e+01 ph/cm2/s
Error 3.61e-01 2.25e-01 1.92e-01 5.49e-01 5.65e-01 7.90e-01 ph/cm2/s
Fluence Band -------- -------- -------- -------- -------- -------- erg/cm2
Error -------- -------- -------- -------- -------- -------- erg/cm2
Peak flux Band 3.22e+00 4.10e+00 3.12e+00 1.94e+00 1.16e+01 1.24e+01 ph/cm2/s
Error -------- -------- 1.84e-01 -------- -------- -------- ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.460 0.056 - - 9.02e-03 2.72e-04 57.490 57
CPL 1.227 0.220 177.6 522.0 1.16e-02 2.73e-03 54.020 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.423 0.075 - - 9.68e-02 4.37e-03 64.400 57
CPL 0.759 0.333 99.6 30.6 2.02e-01 7.52e-02 51.000 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: 18.176000 sec.
T50 in the 50-300 keV band: 5.248000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 83.216 0.088 83.304
T90 28.512 17.512 46.024
T50 6.320 21.048 27.368
Peak 1.000 23.740 24.740
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
49.6032 -47.2118 0.0059 29.3 -64.2 11.6146 33.1 TRIG_00894718
------------------------------------------
Foreground time interval of the image:
0.088 83.304 (delta_t = 83.216 [sec])
Background time interval of the image:
-239.256 0.088 (delta_t = 239.344 [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 0.088 sec. to 83.304 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.46001 ( -0.0558677 0.0558236 )
Norm@50keV : 9.02396E-03 ( -0.000271743 0.000271714 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 57.49 using 59 PHA bins.
# Reduced chi-squared = 1.009 for 57 degrees of freedom
# Null hypothesis probability = 4.570994e-01
Photon flux (15-150 keV) in 83.22 sec: 1.11486 ( -0.0362221 0.0363044 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.1732e-06 ( -2.31223e-07 2.31666e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.088 sec. to 83.304 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.22732 ( -0.225134 0.213918 )
Epeak [keV] : 177.575 ( -61.6826 982.291 )
Norm@50keV : 1.16187E-02 ( -0.00234669 0.0031161 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 54.02 using 59 PHA bins.
# Reduced chi-squared = 0.9646 for 56 degrees of freedom
# Null hypothesis probability = 5.501999e-01
Photon flux (15-150 keV) in 83.22 sec: 1.09808 ( -0.03909 0.03917 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.05879e-06 ( -2.56601e-07 2.55544e-07 ) ergs/cm2
Band function
Time interval is from 0.088 sec. to 83.304 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 1.65925 ( -2.47782 -1.66038 )
beta : -1.52529 ( -0.0784322 0.0718451 )
Epeak [keV] : 31.7372 ( -5.95191 44.997 )
Norm@50keV : 1.46892 ( -1.48048 245.343 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 49.09 using 59 PHA bins.
# Reduced chi-squared = 0.8926 for 55 degrees of freedom
# Null hypothesis probability = 6.987391e-01
Photon flux (15-150 keV) in 83.22 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] : 16.6006 ( )
R^2/D10^2 : 8.70249E-02 ( )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 279.03 using 59 PHA bins.
# Reduced chi-squared = 4.8953 for 57 degrees of freedom
# Null hypothesis probability = 5.269277e-31
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.090e-07 2.484e-08
25- 50 1.775e-06 7.074e-08
50-150 3.466e-06 2.010e-07
15-150 5.650e-06 1.976e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 200.000 (-8.9834 -200)
Norm : 4.60347 (-0.138589 0.138589)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 65.31 using 59 PHA bins.
# Reduced chi-squared = 1.146 for 57 degrees of freedom
# Null hypothesis probability = 2.103870e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 9.540e-07 3.038e-08
25- 50 1.835e-06 6.242e-08
50-150 4.025e-06 1.294e-07
15-150 6.814e-06 2.380e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 7.61828 (-0.779187 0.850829)
R1^2/D10^2 : 0.833799 (-0.243201 0.370322)
kT2 [keV] : 28.9497 (-3.02712 4.15655)
R2^2/D10^2 : 1.02604E-02 (-0.00380029 0.00498626)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 50.40 using 59 PHA bins.
# Reduced chi-squared = 0.9164 for 55 degrees of freedom
# Null hypothesis probability = 6.507694e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 8.149e-07 8.218e-08
25- 50 1.820e-06 1.402e-07
50-150 4.421e-06 4.161e-07
15-150 7.055e-06 5.409e-07
Peak spectrum fit
Power-law model
Time interval is from 23.740 sec. to 24.740 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.42324 ( -0.0746924 0.0751136 )
Norm@50keV : 9.68301E-02 ( -0.00437074 0.00436762 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 64.40 using 59 PHA bins.
# Reduced chi-squared = 1.130 for 57 degrees of freedom
# Null hypothesis probability = 2.337349e-01
Photon flux (15-150 keV) in 1 sec: 11.8558 ( -0.547948 0.548472 ) ph/cm2/s
Energy fluence (15-150 keV) : 9.31306e-07 ( -4.57783e-08 4.5896e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 23.740 sec. to 24.740 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.758718 ( -0.344997 0.320764 )
Epeak [keV] : 99.6194 ( -17.7593 43.4275 )
Norm@50keV : 0.201859 ( -0.0590684 0.0913814 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 51.00 using 59 PHA bins.
# Reduced chi-squared = 0.9107 for 56 degrees of freedom
# Null hypothesis probability = 6.642244e-01
Photon flux (15-150 keV) in 1 sec: 11.5483 ( -0.5651 0.5658 ) ph/cm2/s
Energy fluence (15-150 keV) : 9.02793e-07 ( -4.8965e-08 4.8729e-08 ) ergs/cm2
Band function
Time interval is from 23.740 sec. to 24.740 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.758661 ( -0.273264 0.343592 )
beta : -10.0000 ( 10 1.77636e-15 )
Epeak [keV] : 99.6007 ( -11.8497 43.4201 )
Norm@50keV : 0.201863 ( -0.0591335 0.0914984 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 51.00 using 59 PHA bins.
# Reduced chi-squared = 0.9272 for 55 degrees of freedom
# Null hypothesis probability = 6.282697e-01
Photon flux (15-150 keV) in 1 sec: 11.5558 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 9.03164e-07 ( -9.03157e-07 -4.8082e-08 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 16.2233 ( )
R^2/D10^2 : 1.07313 ( )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 125.96 using 59 PHA bins.
# Reduced chi-squared = 2.2098 for 57 degrees of freedom
# Null hypothesis probability = 4.055598e-07
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.821e-08 4.845e-09
25- 50 2.479e-07 1.500e-08
50-150 4.584e-07 4.120e-08
15-150 7.644e-07 4.350e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 200.000 (-13.7807 -200)
Norm : 49.1970 (-2.20098 2.20098)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 65.21 using 59 PHA bins.
# Reduced chi-squared = 1.144 for 57 degrees of freedom
# Null hypothesis probability = 2.128555e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.225e-07 6.000e-09
25- 50 2.356e-07 1.170e-08
50-150 5.168e-07 2.685e-08
15-150 8.749e-07 4.910e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 8.69653 (-1.59068 1.63268)
R1^2/D10^2 : 5.24510 (-1.95625 4.20216)
kT2 [keV] : 27.7831 (-4.39154 7.48575)
R2^2/D10^2 : 0.122105 (-0.0719306 0.11823)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 52.47 using 59 PHA bins.
# Reduced chi-squared = 0.9541 for 55 degrees of freedom
# Null hypothesis probability = 5.717460e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 9.123e-08 1.647e-08
25- 50 2.447e-07 3.950e-08
50-150 5.680e-07 1.500e-07
15-150 9.039e-07 1.730e-07
Plot creation:
Mon Mar 25 19:35:05 EDT 2019