batgrbproduct analysis for trigger=888648
batgrbproduct Analysis for Trigger=888648
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): Tue Feb 12 13:42:21 EST 2019
Host Name: bat1
Current Working Dir: /local/data/bat1/prebascript/trigger888648/GCN5_download_cron
======================================================================
Trigger: 00888648 Segment: 000
BAT Trigger Time: 571596907.136 [s; MET]
Trigger Stop: 571596909.184 [s; MET]
UTC: 2019-02-11T16:54:44.735020 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 196.67538854469 Dec: 41.9660247246067 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 6.93
Image Trigger?: NO
Rate S/N Ratio: 9.16515138991168 [ if not an image trigger ]
Image S/N Ratio: 6.93
Flight Position: [ source = BAT ]
RA: 196.67538854469 Dec: 41.9660247246067 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 196.652167673568 Dec: 41.975583285453 [deg; J2000]
{ 13h 06m 36.5s , +41d 58' 32.1" }
+/- 2.32078812207693 [arcmin] (estimated 90% radius based on SNR)
+/- 1.11226792300085 [arcmin] (formal 1-sigma fit error)
SNR: 9.13654423741904
Angular difference between Flight and Ground position is 1.184031 arcmin
Partial Coding Fraction: 0.265625 [ including projection effects ]
Duration
T90: 12.4800000190735 +/- 1.45731809584274
Measured from: -11.039999961853
to: 1.44000005722046 [s; relative to TRIGTIME]
T50: 8.89600002765656 +/- 2.36264251075707
Measured from: -8.28799986839294
to: 0.608000159263611 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 0.564000010490417
to: 1.56400001049042 [s; relative to TRIGTIME]
Total Fluence
Measured from: -11.4880000352859
to: 1.66399991512299 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.277444 0.341032 0.253039 0.117314
0.052893 0.055064 0.049348 0.043588 [error]
Peak 0.071227 0.060266 0.085051 0.021549
0.015693 0.017047 0.015922 0.012929 [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 8.92e-08 1.63e-07 2.28e-07 6.70e-07 6.54e-07 1.15e-06 erg/cm2
Error 2.78e-08 2.89e-08 5.14e-08 3.48e-07 1.21e-07 3.81e-07 erg/cm2
Peak flux Power-law 4.92e-01 6.02e-01 5.35e-01 8.20e-01 1.91e+00 2.45e+00 ph/cm2/s
Error 2.46e-01 1.73e-01 1.26e-01 4.72e-01 4.40e-01 5.29e-01 ph/cm2/s
Fluence Cutoff-PL 9.06e-08 1.64e-07 2.26e-07 6.46e-07 6.51e-07 1.13e-06 erg/cm2
Error 2.77e-08 2.72e-08 5.09e-08 3.76e-07 1.16e-07 3.98e-07 erg/cm2
Peak flux Cutoff-PL 4.90e-01 6.02e-01 5.36e-01 8.17e-01 1.91e+00 2.45e+00 ph/cm2/s
Error 2.01e-01 1.72e-01 1.26e-01 4.00e-01 4.30e-01 5.24e-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 1.512 0.330 - - 5.25e-03 8.79e-04 63.660 57
CPL 1.512 0.339 10000.0 0.0 5.27e-03 -2.19e-03 63.680 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.171 0.451 - - 1.64e-02 3.50e-03 54.680 57
CPL 1.172 0.460 10000.0 0.0 1.65e-02 -6.52e-03 54.710 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: 1.280000 sec.
T50 in the 50-300 keV band: 0.640000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 13.152 -11.488 1.664
T90 12.480 -11.040 1.440
T50 8.896 -8.288 0.608
Peak 1.000 0.564 1.564
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
196.6522 +41.9756 0.0211 42.1 -132.3 1.0833 9.1 TRIG_00888648
------------------------------------------
Foreground time interval of the image:
-11.488 1.664 (delta_t = 13.152 [sec])
Background time interval of the image:
-157.835 -11.488 (delta_t = 146.347 [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 -11.488 sec. to 1.664 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.51244 ( -0.326329 0.333406 )
Norm@50keV : 5.25475E-03 ( -0.000885263 0.000873331 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 63.66 using 59 PHA bins.
# Reduced chi-squared = 1.117 for 57 degrees of freedom
# Null hypothesis probability = 2.536805e-01
Photon flux (15-150 keV) in 13.15 sec: 0.658226 ( -0.112262 0.112677 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.54277e-07 ( -1.20683e-07 1.21384e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -11.488 sec. to 1.664 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.51178 ( -0.367094 0.310085 )
Epeak [keV] : 1.00000E+04 ( -10000 -10000 )
Norm@50keV : 5.26870E-03 ( -0.000890473 -0.00526872 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 63.68 using 59 PHA bins.
# Reduced chi-squared = 1.137 for 56 degrees of freedom
# Null hypothesis probability = 2.245310e-01
Photon flux (15-150 keV) in 13.15 sec: 0.659111 ( -0.109399 0.111376 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.51007e-07 ( -1.15024e-07 1.16634e-07 ) ergs/cm2
Band function
Time interval is from -11.488 sec. to 1.664 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.21406 ( 1.21492 1.21492 )
beta : -1.51236 ( -2.20296 0.326652 )
Epeak [keV] : 31.8865 ( -31.3498 -31.3498 )
Norm@50keV : 1.08116E-02 ( -0.00642811 49.0862 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 63.66 using 59 PHA bins.
# Reduced chi-squared = 1.157 for 55 degrees of freedom
# Null hypothesis probability = 1.979904e-01
Photon flux (15-150 keV) in 13.15 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] : 18.8480 (-5.26847 7.53305)
R^2/D10^2 : 3.16162E-02 (-0.0207436 0.0648176)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 85.33 using 59 PHA bins.
# Reduced chi-squared = 1.497 for 57 degrees of freedom
# Null hypothesis probability = 8.902968e-03
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.911e-08 1.152e-08
25- 50 1.392e-07 4.419e-08
50-150 3.629e-07 1.343e-07
15-150 5.313e-07 1.564e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 199.363 (-86.4228 -199.363)
Norm : 2.66883 (-0.439518 0.439531)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 65.86 using 59 PHA bins.
# Reduced chi-squared = 1.155 for 57 degrees of freedom
# Null hypothesis probability = 1.971741e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 8.739e-08 5.009e-08
25- 50 1.681e-07 9.573e-08
50-150 3.687e-07 2.044e-07
15-150 6.242e-07 3.600e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 4.70097 (-1.45289 2.29491)
R1^2/D10^2 : 4.29593 (-3.46011 21.4019)
kT2 [keV] : 33.8548 (-10.5964 27.909)
R2^2/D10^2 : 4.32983E-03 (-0.0034308 0.00572577)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 59.81 using 59 PHA bins.
# Reduced chi-squared = 1.088 for 55 degrees of freedom
# Null hypothesis probability = 3.052213e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.161e-07 6.446e-08
25- 50 1.207e-07 5.635e-08
50-150 4.687e-07 2.679e-07
15-150 7.055e-07 3.148e-07
Peak spectrum fit
Power-law model
Time interval is from 0.564 sec. to 1.564 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.17106 ( -0.460659 0.441378 )
Norm@50keV : 1.63744E-02 ( -0.00353989 0.00345177 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 54.68 using 59 PHA bins.
# Reduced chi-squared = 0.9594 for 57 degrees of freedom
# Null hypothesis probability = 5.624669e-01
Photon flux (15-150 keV) in 1 sec: 1.91447 ( -0.440176 0.439741 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.67524e-07 ( -3.77119e-08 3.75067e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.564 sec. to 1.564 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.17169 ( -0.520221 0.399128 )
Epeak [keV] : 1.00000E+04 ( -10000 -10000 )
Norm@50keV : 1.64617E-02 ( -0.0034282 -0.0164615 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 54.71 using 59 PHA bins.
# Reduced chi-squared = 0.9770 for 56 degrees of freedom
# Null hypothesis probability = 5.237272e-01
Photon flux (15-150 keV) in 1 sec: 1.91285 ( -0.41986 0.44017 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.65753e-07 ( -3.6198e-08 3.6503e-08 ) ergs/cm2
Band function
Time interval is from 0.564 sec. to 1.564 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.935756 ( 0.935711 0.935711 )
beta : -1.17103 ( 1.17071 0.460546 )
Epeak [keV] : 53.5772 ( -53.591 -53.591 )
Norm@50keV : 2.90733E-02 ( -0.0160845 0 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 54.68 using 59 PHA bins.
# Reduced chi-squared = 0.9943 for 55 degrees of freedom
# Null hypothesis probability = 4.866563e-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] : 32.4020 (-9.15593 17.0611)
R^2/D10^2 : 1.93562E-02 (-0.0132192 0.0329583)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 64.83 using 59 PHA bins.
# Reduced chi-squared = 1.137 for 57 degrees of freedom
# Null hypothesis probability = 2.224112e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.368e-08 1.444e-08
25- 50 3.013e-08 1.833e-08
50-150 4.353e-09 3.525e-09
15-150 5.816e-08 3.532e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 200.000 (-72.5798 -200)
Norm : 8.04524 (-1.73307 1.73307)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 59.09 using 59 PHA bins.
# Reduced chi-squared = 1.037 for 57 degrees of freedom
# Null hypothesis probability = 3.990481e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.005e-08 1.210e-08
25- 50 3.856e-08 2.249e-08
50-150 8.457e-08 4.958e-08
15-150 1.432e-07 8.320e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 4.62132 (-1.28348 1.70218)
R1^2/D10^2 : 14.0122 (-10.6997 53.729)
kT2 [keV] : 45.0771 (-14.7503 48.339)
R2^2/D10^2 : 7.16254E-03 (-0.00571237 0.0142877)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 45.30 using 59 PHA bins.
# Reduced chi-squared = 0.8236 for 55 degrees of freedom
# Null hypothesis probability = 8.214653e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.632e-08 1.556e-08
25- 50 2.528e-08 1.345e-08
50-150 1.335e-07 7.554e-08
15-150 1.851e-07 9.617e-08
Plot creation:
Tue Feb 12 13:46:04 EST 2019