batgrbproduct analysis for trigger=896552
batgrbproduct Analysis for Trigger=896552
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): Fri Apr 5 20:26:40 EDT 2019
Host Name: bat1
Current Working Dir: /local/data/bat1/prebascript/trigger896552/GCN5_download_cron
======================================================================
Trigger: 00896552 Segment: 000
BAT Trigger Time: 576050272 [s; MET]
Trigger Stop: 576050336 [s; MET]
UTC: 2019-04-04T05:57:29.318020 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 164.406920557891 Dec: -52.3869463131394 [deg; J2000]
Catalogged Source?: YES
Point Source?: YES
GRB Indicated?: NO [ by BAT flight software ]
Image S/N Ratio: 5.83
Image Trigger?: YES
Rate S/N Ratio: 0 [ if not an image trigger ]
Image S/N Ratio: 5.83
Flight Position: [ source = BAT ]
RA: 164.406920557891 Dec: -52.3869463131394 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 164.485004109641 Dec: -52.3510706207357 [deg; J2000]
{ 10h 57m 56.4s , -52d 21' 03.9" }
+/- 4.66640262568385 [arcmin] (estimated 90% radius based on SNR)
+/- 3.24483094900374 [arcmin] (formal 1-sigma fit error)
SNR: 3.36844539659127
Angular difference between Flight and Ground position is 3.579965 arcmin
Partial Coding Fraction: 0.7265625 [ including projection effects ]
Duration
T90: 442.268000006676 +/- 52.2633834055384
Measured from: -42.6719999313354
to: 399.59600007534 [s; relative to TRIGTIME]
T50: 219.955999970436 +/- 29.8102170536984
Measured from: 67.0680000782013
to: 287.024000048637 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 82.5880000591278
to: 83.5880000591278 [s; relative to TRIGTIME]
Total Fluence
Measured from: -77.9119999408722
to: 434.988000035286 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 3.160891 4.884888 2.508542 3.208010
0.230147 0.248244 0.234168 0.263795 [error]
Peak 0.032067 0.053946 0.024435 0.014616
0.010227 0.011821 0.010928 0.012885 [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 1.05e-06 1.80e-06 2.36e-06 6.26e-06 6.92e-06 1.15e-05 erg/cm2
Error 1.11e-07 1.19e-07 2.35e-07 1.31e-06 5.51e-07 1.52e-06 erg/cm2
Peak flux Power-law 3.42e-01 2.95e-01 1.73e-01 1.53e-01 8.76e-01 9.63e-01 ph/cm2/s
Error 1.54e-01 9.15e-02 9.26e-02 1.88e-01 2.72e-01 3.23e-01 ph/cm2/s
Fluence Cutoff-PL 1.02e-06 1.86e-06 2.34e-06 3.73e-06 6.66e-06 8.93e-06 erg/cm2
Error 1.25e-07 1.75e-07 2.47e-07 2.59e-06 7.87e-07 3.04e-06 erg/cm2
Peak flux Cutoff-PL 3.45e-01 2.94e-01 1.71e-01 1.48e-01 8.75e-01 9.58e-01 ph/cm2/s
Error 1.20e-01 1.08e-01 1.34e-01 2.03e-01 2.73e-01 3.43e-01 ph/cm2/s
Fluence Band 8.63e-07 1.30e-06 1.17e-06 1.47e-06 3.89e-06 4.86e-06 erg/cm2
Error -------- -------- -------- -------- -------- -------- erg/cm2
Peak flux Band 2.04e-01 2.70e-01 6.47e-02 1.41e-02 5.51e-01 5.59e-01 ph/cm2/s
Error 1.47e-01 -------- -------- -------- 2.45e-01 -------- ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.612 0.122 - - 1.45e-03 1.05e-04 65.340 57
CPL 1.347 0.558 106.0 0.0 2.05e-03 0.00e+00 64.780 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.764 0.647 - - 6.45e-03 2.60e-03 54.100 57
CPL 2.808 4.649 249.7 0.0 1.83e-03 0.00e+00 53.700 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: 246.208000 sec.
T50 in the 50-300 keV band: 155.968000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 512.900 -77.912 434.988
T90 442.268 -42.672 399.596
T50 219.956 67.068 287.024
Peak 1.000 82.588 83.588
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
164.4850 -52.3511 0.0572 24.5 32.2 10.1142 3.4 TRIG_00896552
------------------------------------------
Foreground time interval of the image:
-77.912 92.840 (delta_t = 170.752 [sec])
94.000 357.716 (delta_t = 263.715 [sec])
359.000 427.501 (delta_t = 68.501 [sec])
Background time interval of the image:
-239.000 -77.912 (delta_t = 161.088 [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
Multiple GTIs in the spectrum
tstart tstop
-77.912000 92.840000
94.000000 357.715500
359.000000 434.988000
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.61166 ( -0.121113 0.122631 )
Norm@50keV : 1.45061E-03 ( -0.000105787 0.000104774 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 65.34 using 59 PHA bins.
# Reduced chi-squared = 1.146 for 57 degrees of freedom
# Null hypothesis probability = 2.096141e-01
Photon flux (15-150 keV) in 510.5 sec: 0.187090 ( -0.0122928 0.0122965 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.91605e-06 ( -5.47282e-07 5.55296e-07 ) ergs/cm2
Cutoff power-law model
Multiple GTIs in the spectrum
tstart tstop
-77.912000 92.840000
94.000000 357.715500
359.000000 434.988000
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.34683 ( -0.702111 0.414434 )
Epeak [keV] : 105.959 ( )
Norm@50keV : 2.04970E-03 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 64.78 using 59 PHA bins.
# Reduced chi-squared = 1.157 for 56 degrees of freedom
# Null hypothesis probability = 1.971043e-01
Photon flux (15-150 keV) in 510.5 sec: 0.184434 ( -0.013817 0.013452 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.65687e-06 ( -8.21037e-07 7.52171e-07 ) ergs/cm2
Band function
Multiple GTIs in the spectrum
tstart tstop
-77.912000 92.840000
94.000000 357.715500
359.000000 434.988000
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 1.47375 ( -1.30311 3.95387 )
beta : -1.99549 ( -0.346017 0.248697 )
Epeak [keV] : 36.7595 ( -8.41373 11.2512 )
Norm@50keV : 0.142983 ( -0.138717 19.3558 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 54.27 using 59 PHA bins.
# Reduced chi-squared = 0.9868 for 55 degrees of freedom
# Null hypothesis probability = 5.023347e-01
Photon flux (15-150 keV) in 510.5 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 3.89299e-06 ( 0 0 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 11.2802 (-0.805185 0.892577)
R^2/D10^2 : 5.70657E-02 (-0.0139947 0.0179743)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 89.33 using 59 PHA bins.
# Reduced chi-squared = 1.567 for 57 degrees of freedom
# Null hypothesis probability = 3.995431e-03
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 7.781e-07 8.679e-08
25- 50 2.271e-06 1.549e-07
50-150 1.664e-06 2.902e-07
15-150 4.713e-06 4.023e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 154.399 (-47.9949 -153.332)
Norm : 0.768280 (-0.0550663 0.0690868)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 64.52 using 59 PHA bins.
# Reduced chi-squared = 1.132 for 57 degrees of freedom
# Null hypothesis probability = 2.303408e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.005e-06 9.495e-08
25- 50 1.870e-06 3.954e-07
50-150 3.735e-06 1.699e-06
15-150 6.610e-06 1.949e-06
Double BB
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 9.33525 (-0.648993 0.842707)
R1^2/D10^2 : 0.101035 (-0.0372864 0.0198168)
kT2 [keV] : 200.000 (-138.896 -200)
R2^2/D10^2 : 2.42660E-05 (-4.72679e-06 5.53342e-05)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 37.30 using 59 PHA bins.
#Fit statistic : Chi-Squared = 35.93 using 59 PHA bins.
# Reduced chi-squared = 0.6782 for 55 degrees of freedom
# Reduced chi-squared = 0.6533 for 55 degrees of freedom
# Null hypothesis probability = 9.676174e-01
# Null hypothesis probability = 9.782735e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 9.200e-07 1.373e-07
25- 50 2.121e-06 3.637e-07
50-150 4.190e-06 3.547e-06
15-150 7.231e-06 4.156e-06
Peak spectrum fit
Power-law model
Time interval is from 82.588 sec. to 83.588 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.76388 ( -0.593592 0.700527 )
Norm@50keV : 6.44577E-03 ( -0.00271326 0.00249459 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 54.10 using 59 PHA bins.
# Reduced chi-squared = 0.9491 for 57 degrees of freedom
# Null hypothesis probability = 5.847128e-01
Photon flux (15-150 keV) in 1 sec: 0.876080 ( -0.272009 0.272236 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.9433e-08 ( -2.36584e-08 2.60305e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 82.588 sec. to 83.588 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.80811 ( -9.03186 0.26558 )
Epeak [keV] : 249.663 ( )
Norm@50keV : 1.83103E-03 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 53.70 using 59 PHA bins.
# Reduced chi-squared = 0.9590 for 56 degrees of freedom
# Null hypothesis probability = 5.623395e-01
Photon flux (15-150 keV) in 1 sec: 0.875196 ( -0.273634 0.271954 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.92584e-08 ( -2.88084e-08 2.58537e-08 ) ergs/cm2
Band function
Time interval is from 82.588 sec. to 83.588 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.14778 ( 1.11507 1.11507 )
beta : -1.94315 ( 1.95824 0.777055 )
Epeak [keV] : 49.2171 ( -47.3302 -47.3302 )
Norm@50keV : 1.57222E-02 ( -0.0174256 1.60682e+06 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 54.01 using 59 PHA bins.
# Reduced chi-squared = 0.9819 for 55 degrees of freedom
# Null hypothesis probability = 5.125921e-01
Photon flux (15-150 keV) in 1 sec: 0.551161 ( 6.44884 -0.23849 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.99691e-08 ( 0 0 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 9.78359 (-2.69528 4.23034)
R^2/D10^2 : 0.452601 (-0.452608 1.02453)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 55.43 using 59 PHA bins.
# Reduced chi-squared = 0.9725 for 57 degrees of freedom
# Null hypothesis probability = 5.341054e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 8.754e-09 5.470e-09
25- 50 2.110e-08 1.301e-08
50-150 1.033e-08 7.530e-09
15-150 4.018e-08 2.543e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 99.9928 (-99.993 -99.993)
Norm : 3.86492 (-1.34235 2.60685)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 54.25 using 59 PHA bins.
# Reduced chi-squared = 0.9518 for 57 degrees of freedom
# Null hypothesis probability = 5.787417e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.010e-08 6.210e-09
25- 50 1.747e-08 1.082e-08
50-150 2.831e-08 2.214e-08
15-150 5.587e-08 3.883e-08
Double BB
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 8.55499 (-8.55016 3.59249)
R1^2/D10^2 : 0.672630 (-0.673827 -0.673827)
kT2 [keV] : 199.359 (-199.363 -199.363)
R2^2/D10^2 : 1.04790E-04 (-0.000113148 0.741906)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 53.97 using 59 PHA bins.
#Fit statistic : Chi-Squared = 53.23 using 59 PHA bins.
# Reduced chi-squared = 0.9813 for 55 degrees of freedom
# Reduced chi-squared = 0.9677 for 55 degrees of freedom
# Null hypothesis probability = 5.139098e-01
# Null hypothesis probability = 5.427042e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 9.904e-09 4.867e-09
25- 50 1.944e-08 1.192e-08
50-150 1.292e-08 9.550e-09
15-150 4.227e-08 2.602e-08
Plot creation:
Fri Apr 5 20:35:01 EDT 2019