batgrbproduct analysis for trigger=887541
batgrbproduct Analysis for Trigger=887541
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 Feb 4 19:36:21 EST 2019
Host Name: bat1
Current Working Dir: /local/data/bat1/prebascript/trigger887541/GCN5_download_cron
======================================================================
Trigger: 00887541 Segment: 000
BAT Trigger Time: 570921520 [s; MET]
Trigger Stop: 570921840 [s; MET]
UTC: 2019-02-03T21:18:17.641460 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 262.300791965301 Dec: -36.2671450001977 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: NO [ by BAT flight software ]
Image S/N Ratio: 7.65
Image Trigger?: YES
Rate S/N Ratio: 0 [ if not an image trigger ]
Image S/N Ratio: 7.65
Flight Position: [ source = BAT ]
RA: 262.300791965301 Dec: -36.2671450001977 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 262.305432632385 Dec: -36.2275843224726 [deg; J2000]
{ 17h 29m 13.3s , -36d 13' 39.3" }
+/- 3.12133994147976 [arcmin] (estimated 90% radius based on SNR)
+/- 2.00197659415235 [arcmin] (formal 1-sigma fit error)
SNR: 5.98297036625027
Angular difference between Flight and Ground position is 2.384239 arcmin
Partial Coding Fraction: 1.015625 [ including projection effects ]
Duration
T90: 320 +/-
Measured from: 0
to: 320 [s; relative to TRIGTIME]
T50: 320 +/-
Measured from: 0
to: 320 [s; relative to TRIGTIME]
WARNING: battblocks failed. Used TDRSS fore/background intervals
Fluence
Peak Flux (peak 320 second)
Measured from: 0
to: 320 [s; relative to TRIGTIME]
Total Fluence
Measured from: 0
to: 320 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 1.273787 0.993239 0.379198 0.131315
0.132088 0.118973 0.097117 0.080181 [error]
Peak 1.273787 0.993239 0.379198 0.131315
0.132088 0.118973 0.097117 0.080181 [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 3.79e-07 3.98e-07 2.95e-07 3.54e-07 1.21e-06 1.43e-06 erg/cm2
Error 6.37e-08 5.63e-08 8.63e-08 1.99e-07 1.94e-07 3.12e-07 erg/cm2
Peak flux Power-law 5.13e-02 3.00e-02 1.11e-02 5.47e-03 9.53e-02 9.79e-02 ph/cm2/s
Error 8.83e-03 4.10e-03 3.14e-03 2.87e-03 1.21e-02 1.24e-02 ph/cm2/s
Fluence Cutoff-PL 3.82e-07 3.97e-07 2.92e-07 3.41e-07 1.21e-06 1.41e-06 erg/cm2
Error 6.39e-08 6.05e-08 9.11e-08 2.93e-07 2.04e-07 3.70e-07 erg/cm2
Peak flux Cutoff-PL 5.13e-02 3.00e-02 1.11e-02 5.42e-03 9.53e-02 9.79e-02 ph/cm2/s
Error -------- -------- -------- -------- -------- -------- ph/cm2/s
Fluence Band -------- -------- -------- -------- -------- -------- erg/cm2
Error -------- -------- -------- -------- -------- -------- erg/cm2
Peak flux Band 5.16e-02 2.99e-02 1.10e-02 5.29e-03 9.53e-02 9.79e-02 ph/cm2/s
Error 8.84e-03 4.11e-03 2.48e-03 2.07e-03 1.21e-02 1.24e-02 ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 2.431 0.295 - - 5.06e-04 1.07e-04 65.160 57
CPL 1.988 -0.634 1.1 12.8 9.22e-04 0.00e+00 66.080 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 2.431 0.295 - - 5.06e-04 1.07e-04 65.160 57
CPL 1.988 -0.634 1.1 12.8 9.22e-04 0.00e+00 66.080 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 320.000 0.000 320.000
T90 320.000 0.000 320.000
T50 320.000 0.000 320.000
Peak 320.000 0.000 320.000
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
262.3054 -36.2276 0.0321 3.5 -148.2 2.4893 6.0 TRIG_00887541
------------------------------------------
Foreground time interval of the image:
0.000 243.109 (delta_t = 243.109 [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 0.000 sec. to 243.109 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.43077 ( -0.279511 0.310603 )
Norm@50keV : 5.06032E-04 ( -0.000107812 0.000105435 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 65.16 using 59 PHA bins.
# Reduced chi-squared = 1.143 for 57 degrees of freedom
# Null hypothesis probability = 2.139965e-01
Photon flux (15-150 keV) in 243.1 sec: 9.53421E-02 ( -0.0120575 0.0120583 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.20864e-06 ( -1.90113e-07 1.97705e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 243.109 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.98772 ( -0.719239 -1.98772 )
Epeak [keV] : 1.11171 ( -0.538499 25.1474 )
Norm@50keV : 9.22360E-04 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 66.08 using 59 PHA bins.
# Reduced chi-squared = 1.180 for 56 degrees of freedom
# Null hypothesis probability = 1.677652e-01
Photon flux (15-150 keV) in 243.1 sec: 9.53034E-02 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 1.20542e-06 ( -2.0637e-07 2.00839e-07 ) ergs/cm2
Band function
Time interval is from 0.000 sec. to 243.109 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.72476 ( 1.72521 1.72521 )
beta : -2.43078 ( -2.3846 0.280136 )
Epeak [keV] : 6.71352 ( -6.34801 127.089 )
Norm@50keV : 2.17655E-03 ( -0.0022742 412776 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 65.17 using 59 PHA bins.
# Reduced chi-squared = 1.185 for 55 degrees of freedom
# Null hypothesis probability = 1.639386e-01
Photon flux (15-150 keV) in 243.1 sec: 9.53039E-02 ( 6.9047 -0.0120714 ) 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] : 7.04409 (-1.08464 1.29133)
R^2/D10^2 : 0.166485 (-0.0836053 0.173424)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 82.03 using 59 PHA bins.
# Reduced chi-squared = 1.439 for 57 degrees of freedom
# Null hypothesis probability = 1.662886e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.247e-07 7.283e-08
25- 50 4.501e-07 9.068e-08
50-150 7.630e-08 3.599e-08
15-150 8.511e-07 1.521e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 34.9683 (-10.5699 17.2302)
Norm : 0.664609 (-0.171986 0.258647)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 68.49 using 59 PHA bins.
# Reduced chi-squared = 1.202 for 57 degrees of freedom
# Null hypothesis probability = 1.416105e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.528e-07 6.321e-08
25- 50 4.365e-07 6.795e-08
50-150 2.896e-07 1.240e-07
15-150 1.079e-06 1.974e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 4.71031 (-1.58007 1.48181)
R1^2/D10^2 : 0.756044 (-0.507276 3.96045)
kT2 [keV] : 18.5874 (-7.61515 18.8543)
R2^2/D10^2 : 2.21577E-03 (-0.00201254 0.0114793)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 66.21 using 59 PHA bins.
# Reduced chi-squared = 1.204 for 55 degrees of freedom
# Null hypothesis probability = 1.430640e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.867e-07 1.984e-07
25- 50 3.712e-07 1.523e-07
50-150 4.471e-07 2.638e-07
15-150 1.205e-06 5.598e-07
Peak spectrum fit
Power-law model
Time interval is from 0.000 sec. to 243.109 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.43077 ( -0.279511 0.310603 )
Norm@50keV : 5.06032E-04 ( -0.000107812 0.000105435 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 65.16 using 59 PHA bins.
# Reduced chi-squared = 1.143 for 57 degrees of freedom
# Null hypothesis probability = 2.139965e-01
Photon flux (15-150 keV) in 243.1 sec: 9.53421E-02 ( -0.0120575 0.0120583 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.20864e-06 ( -1.90113e-07 1.97705e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 243.109 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.98772 ( -0.719239 -1.98772 )
Epeak [keV] : 1.11171 ( -0.538499 25.1474 )
Norm@50keV : 9.22360E-04 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 66.08 using 59 PHA bins.
# Reduced chi-squared = 1.180 for 56 degrees of freedom
# Null hypothesis probability = 1.677652e-01
Photon flux (15-150 keV) in 243.1 sec: 9.53034E-02 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 1.20542e-06 ( -2.0637e-07 2.00839e-07 ) ergs/cm2
Band function
Time interval is from 0.000 sec. to 243.109 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.72476 ( 1.72521 1.72521 )
beta : -2.43078 ( -2.3846 0.280136 )
Epeak [keV] : 6.71352 ( -6.34801 127.089 )
Norm@50keV : 2.17655E-03 ( -0.0022742 412776 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 65.17 using 59 PHA bins.
# Reduced chi-squared = 1.185 for 55 degrees of freedom
# Null hypothesis probability = 1.639386e-01
Photon flux (15-150 keV) in 243.1 sec: 9.53039E-02 ( 6.9047 -0.0120714 ) 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] : 7.04409 (-1.08464 1.29133)
R^2/D10^2 : 0.166485 (-0.0836053 0.173424)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 82.03 using 59 PHA bins.
# Reduced chi-squared = 1.439 for 57 degrees of freedom
# Null hypothesis probability = 1.662886e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.247e-07 7.641e-08
25- 50 4.501e-07 1.047e-07
50-150 7.630e-08 3.413e-08
15-150 8.511e-07 1.700e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 34.9683 (-10.5699 17.2302)
Norm : 0.664609 (-0.171986 0.258647)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 68.49 using 59 PHA bins.
# Reduced chi-squared = 1.202 for 57 degrees of freedom
# Null hypothesis probability = 1.416105e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.528e-07 5.737e-08
25- 50 4.365e-07 7.500e-08
50-150 2.896e-07 1.249e-07
15-150 1.079e-06 1.979e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 4.71031 (-1.58007 1.48181)
R1^2/D10^2 : 0.756044 (-0.507276 3.96045)
kT2 [keV] : 18.5874 (-7.61515 18.8543)
R2^2/D10^2 : 2.21577E-03 (-0.00201254 0.0114793)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 66.21 using 59 PHA bins.
# Reduced chi-squared = 1.204 for 55 degrees of freedom
# Null hypothesis probability = 1.430640e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.867e-07 2.031e-07
25- 50 3.712e-07 1.923e-07
50-150 4.471e-07 2.685e-07
15-150 1.205e-06 6.257e-07
Plot creation:
Mon Feb 4 19:44:01 EST 2019