batgrbproduct analysis for trigger=885807
batgrbproduct Analysis for Trigger=885807
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 Jan 27 10:38:36 EST 2019
Host Name: bat1
Current Working Dir: /local/data/bat1/prebascript/trigger885807/GCN5_download_cron
======================================================================
Trigger: 00885807 Segment: 000
BAT Trigger Time: 570191896 [s; MET]
Trigger Stop: 570192296 [s; MET]
UTC: 2019-01-26T10:37:53.687260 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 207.003066380326 Dec: -63.2654453529287 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 7.49
Image Trigger?: YES
Rate S/N Ratio: 0 [ if not an image trigger ]
Image S/N Ratio: 7.49
Flight Position: [ source = BAT ]
RA: 207.003066380326 Dec: -63.2654453529287 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 206.983058096988 Dec: -63.2397962599045 [deg; J2000]
{ 13h 47m 55.9s , -63d 14' 23.3" }
+/- 2.34272857522848 [arcmin] (estimated 90% radius based on SNR)
+/- 1.18121907208989 [arcmin] (formal 1-sigma fit error)
SNR: 9.01455162476816
Angular difference between Flight and Ground position is 1.631033 arcmin
Partial Coding Fraction: 0.4492188 [ including projection effects ]
Duration
T90: 202.863999843597 +/- 124.084167222975
Measured from: -0.97599983215332
to: 201.888000011444 [s; relative to TRIGTIME]
T50: 101.755999922752 +/- 70.9466731617794
Measured from: 55.4360001087189
to: 157.192000031471 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 114.136000037193
to: 115.136000037193 [s; relative to TRIGTIME]
Total Fluence
Measured from: -15.3279999494553
to: 313.651999950409 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 1.362152 2.228265 0.994028 0.132191
0.203133 0.203890 0.178175 0.162960 [error]
Peak 0.020742 0.045712 0.008638 0.008833
0.011312 0.011770 0.009772 0.009024 [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 5.88e-07 8.57e-07 9.31e-07 1.89e-06 2.96e-06 4.27e-06 erg/cm2
Error 1.02e-07 1.02e-07 1.70e-07 6.85e-07 4.04e-07 8.64e-07 erg/cm2
Peak flux Power-law 3.83e-01 2.31e-01 8.86e-02 4.55e-02 7.26e-01 7.48e-01 ph/cm2/s
Error 2.05e-01 1.09e-01 7.61e-02 8.11e-02 3.04e-01 3.17e-01 ph/cm2/s
Fluence Cutoff-PL 4.86e-07 1.03e-06 8.73e-07 2.14e-07 2.57e-06 2.61e-06 erg/cm2
Error 1.22e-07 1.54e-07 2.28e-07 3.78e-07 4.30e-07 5.50e-07 erg/cm2
Peak flux Cutoff-PL 3.72e-01 2.44e-01 8.59e-02 2.34e-02 7.18e-01 7.28e-01 ph/cm2/s
Error 2.97e-01 1.70e-01 8.62e-02 5.24e-02 3.23e-01 3.26e-01 ph/cm2/s
Fluence Band 4.72e-07 1.05e-06 8.43e-07 5.63e-07 2.64e-06 2.93e-06 erg/cm2
Error 1.30e-07 1.66e-07 -------- -------- -------- -------- erg/cm2
Peak flux Band 5.04e-02 6.27e-02 2.98e-02 7.53e-03 1.48e-01 1.51e-01 ph/cm2/s
Error -------- 9.54e-03 6.72e-03 1.03e-02 2.04e-02 2.26e-02 ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.881 0.206 - - 9.78e-04 1.34e-04 61.630 57
CPL 0.090 1.370 45.5 7.6 9.92e-03 3.95e-02 53.670 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 2.380 1.064 - - 3.97e-03 3.27e-03 53.600 57
CPL 1.805 0.000 13.1 0.0 8.92e-03 0.00e+00 53.580 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 328.980 -15.328 313.652
T90 202.864 -0.976 201.888
T50 101.756 55.436 157.192
Peak 1.000 114.136 115.136
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
206.9831 -63.2398 0.0213 41.1 -160.3 5.1071 9.0 TRIG_00885807
------------------------------------------
Foreground time interval of the image:
-14.699 313.652 (delta_t = 328.351 [sec])
Background time interval of the image:
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 -15.328 sec. to 313.652 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.88090 ( -0.201279 0.210555 )
Norm@50keV : 9.77712E-04 ( -0.000134766 0.000132518 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 61.63 using 59 PHA bins.
# Reduced chi-squared = 1.081 for 57 degrees of freedom
# Null hypothesis probability = 3.138920e-01
Photon flux (15-150 keV) in 329 sec: 0.139188 ( -0.0167427 0.0167619 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.95704e-06 ( -4.0012e-07 4.06887e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -15.328 sec. to 313.652 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 9.03271E-02 ( -1.5797 1.16028 )
Epeak [keV] : 45.5372 ( -7.08505 8.02768 )
Norm@50keV : 9.91669E-03 ( -0.00995474 0.0691022 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 53.67 using 59 PHA bins.
# Reduced chi-squared = 0.9584 for 56 degrees of freedom
# Null hypothesis probability = 5.635074e-01
Photon flux (15-150 keV) in 329 sec: 0.130409 ( -0.017573 0.017621 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.57137e-06 ( -4.0845e-07 4.5149e-07 ) ergs/cm2
Band function
Time interval is from -15.328 sec. to 313.652 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -9.00775E-02 ( -0.827947 1.69397 )
beta : -10.00000 ( 10 4.60772e-06 )
Epeak [keV] : 45.5301 ( -7.08079 12.7478 )
Norm@50keV : 9.92072E-03 ( -0.0011563 0.0692585 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 53.67 using 59 PHA bins.
# Reduced chi-squared = 0.9758 for 55 degrees of freedom
# Null hypothesis probability = 5.254990e-01
Photon flux (15-150 keV) in 329 sec: 0.130792 ( 6.86921 -0.017499 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.64123e-06 ( 0 0 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 11.0421 (-1.25418 1.43702)
R^2/D10^2 : 4.71091E-02 (-0.0176412 0.02744)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 56.68 using 59 PHA bins.
# Reduced chi-squared = 0.9943 for 57 degrees of freedom
# Null hypothesis probability = 4.871825e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.952e-07 7.473e-08
25- 50 1.123e-06 1.591e-07
50-150 7.756e-07 2.201e-07
15-150 2.294e-06 3.278e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 78.6736 (-23.34 42.7304)
Norm : 0.665873 (-0.109268 0.134679)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 56.66 using 59 PHA bins.
# Reduced chi-squared = 0.9941 for 57 degrees of freedom
# Null hypothesis probability = 4.876486e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.678e-07 8.505e-08
25- 50 9.309e-07 1.193e-07
50-150 1.299e-06 6.141e-07
15-150 2.798e-06 6.376e-07
Double BB
------------------------------------------------------------
#Fit statistic : Chi-Squared = 53.81 using 59 PHA bins.
#Fit statistic : Chi-Squared = 53.69 using 59 PHA bins.
#Fit statistic : Chi-Squared = 53.54 using 59 PHA bins.
#Fit statistic : Chi-Squared = 53.52 using 59 PHA bins.
# Reduced chi-squared = 0.9783 for 55 degrees of freedom
# Reduced chi-squared = 0.9762 for 55 degrees of freedom
# Reduced chi-squared = 0.9735 for 55 degrees of freedom
# Reduced chi-squared = 0.9732 for 55 degrees of freedom
# Null hypothesis probability = 5.202236e-01
# Null hypothesis probability = 5.247311e-01
# Null hypothesis probability = 5.304981e-01
# Null hypothesis probability = 5.311728e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.578e-07 1.165e-07
25- 50 1.070e-06 2.217e-07
50-150 8.485e-07 2.579e-07
15-150 2.376e-06 4.871e-07
Peak spectrum fit
Power-law model
Time interval is from 114.136 sec. to 115.136 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.37961 ( -0.815152 1.31304 )
Norm@50keV : 3.97272E-03 ( -0.00397272 0.00256642 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 53.60 using 59 PHA bins.
# Reduced chi-squared = 0.9404 for 57 degrees of freedom
# Null hypothesis probability = 6.033962e-01
Photon flux (15-150 keV) in 1 sec: 0.726373 ( -0.303635 0.303675 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.85771e-08 ( -1.9616e-08 2.15747e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 114.136 sec. to 115.136 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.80505 ( )
Epeak [keV] : 13.0665 ( )
Norm@50keV : 8.92099E-03 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 53.58 using 59 PHA bins.
# Reduced chi-squared = 0.9568 for 56 degrees of freedom
# Null hypothesis probability = 5.670035e-01
Photon flux (15-150 keV) in 1 sec: 0.718473 ( -0.337814 0.308617 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.78472e-08 ( -1.93694e-08 1.6944e-08 ) ergs/cm2
Band function
Time interval is from 114.136 sec. to 115.136 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.52115 ( 1.52113 1.52113 )
beta : -3.09584 ( 3.0657 10.7174 )
Epeak [keV] : 21.4913 ( -21.4404 -21.4404 )
Norm@50keV : 1.32173E-02 ( -0.0130731 771593 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 53.55 using 59 PHA bins.
# Reduced chi-squared = 0.9737 for 55 degrees of freedom
# Null hypothesis probability = 5.300957e-01
Photon flux (15-150 keV) in 1 sec: 0.147798 ( 6.8522 -0.020364 ) ph/cm2/s
Energy fluence (15-150 keV) : 9.2811e-09 ( 0 0 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 8.70738 (-3.15505 4.36295)
R^2/D10^2 : 0.589507 (-0.589507 2.88371)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 54.02 using 59 PHA bins.
# Reduced chi-squared = 0.9477 for 57 degrees of freedom
# Null hypothesis probability = 5.876532e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 8.546e-09 5.400e-09
25- 50 1.724e-08 1.135e-08
50-150 5.937e-09 4.859e-09
15-150 3.172e-08 2.181e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 38.6483 (-38.6483 148.156)
Norm : 4.83617 (-2.75399 8.59665)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 53.60 using 59 PHA bins.
# Reduced chi-squared = 0.9404 for 57 degrees of freedom
# Null hypothesis probability = 6.032581e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.097e-08 7.155e-09
25- 50 1.422e-08 9.335e-09
50-150 1.059e-08 9.140e-09
15-150 3.579e-08 2.501e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 1.77417 (-1.76027 8.11384)
R1^2/D10^2 : 1586.01 (-1809.48 -1809.48)
kT2 [keV] : 10.0992 (-3.61701 6.76234)
R2^2/D10^2 : 0.285207 (-0.289843 0.328852)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 51.60 using 59 PHA bins.
# Reduced chi-squared = 0.9382 for 55 degrees of freedom
# Null hypothesis probability = 6.052535e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.075e-08 4.816e-09
25- 50 1.506e-08 1.026e-08
50-150 8.047e-09 6.315e-09
15-150 3.385e-08 1.969e-08
Plot creation:
Sun Jan 27 10:46:07 EST 2019