batgrbproduct analysis for trigger=887512
batgrbproduct Analysis for Trigger=887512
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 16:46:05 EST 2019
Host Name: bat1
Current Working Dir: /local/data/bat1/prebascript/trigger887512/GCN5_download_cron
======================================================================
Trigger: 00887512 Segment: 000
BAT Trigger Time: 570901470.784 [s; MET]
Trigger Stop: 570901474.88 [s; MET]
UTC: 2019-02-03T15:44:08.426720 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 22.5767302168316 Dec: 55.7384085258687 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 7.89
Image Trigger?: NO
Rate S/N Ratio: 40 [ if not an image trigger ]
Image S/N Ratio: 7.89
Flight Position: [ source = BAT ]
RA: 22.5767302168316 Dec: 55.7384085258687 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 22.6030697194229 Dec: 55.7362495232514 [deg; J2000]
{ 01h 30m 24.7s , +55d 44' 10.5" }
+/- 0.962139547971585 [arcmin] (estimated 90% radius based on SNR)
+/- 0.357938219279692 [arcmin] (formal 1-sigma fit error)
SNR: 32.1413415236122
Angular difference between Flight and Ground position is 0.899110 arcmin
Partial Coding Fraction: 0.2167969 [ including projection effects ]
Duration
T90: 96 +/- 16
Measured from: -68.7839999198914
to: 27.2160000801086 [s; relative to TRIGTIME]
T50: 32 +/- 16
Measured from: -36.7839999198914
to: -4.78399991989136 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 2.71599996089935
to: 3.71599996089935 [s; relative to TRIGTIME]
Total Fluence
Measured from: -68.7840000391006
to: 43.2159999608994 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 3.400447 6.023045 7.024547 3.218241
0.176163 0.194606 0.184160 0.155536 [error]
Peak 0.049660 0.136611 0.133898 0.083775
0.018045 0.021739 0.021659 0.019615 [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 1.20e-06 2.90e-06 5.57e-06 2.62e-05 1.51e-05 3.58e-05 erg/cm2
Error 8.73e-08 1.25e-07 1.78e-07 1.99e-06 4.71e-07 2.03e-06 erg/cm2
Peak flux Power-law 7.45e-01 9.60e-01 9.04e-01 1.50e+00 3.11e+00 4.11e+00 ph/cm2/s
Error 2.61e-01 2.09e-01 1.68e-01 5.88e-01 5.66e-01 7.46e-01 ph/cm2/s
Fluence Cutoff-PL 1.20e-06 2.90e-06 5.57e-06 2.59e-05 1.51e-05 3.56e-05 erg/cm2
Error 9.53e-08 1.24e-07 1.47e-07 2.98e-06 4.70e-07 2.92e-06 erg/cm2
Peak flux Cutoff-PL 6.45e-01 9.93e-01 9.70e-01 9.01e-01 3.06e+00 3.51e+00 ph/cm2/s
Error 3.14e-01 2.32e-01 2.16e-01 7.14e-01 5.77e-01 1.05e+00 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 1.058 0.057 - - 1.38e-02 4.56e-04 66.890 57
CPL 1.053 0.058 9999.4 0.0 1.38e-02 1.44e-03 66.920 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.087 0.294 - - 2.69e-02 4.71e-03 70.770 57
CPL 0.520 1.085 150.0 0.0 4.83e-02 9.06e-02 70.070 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: 74.816000 sec.
T50 in the 50-300 keV band: 29.440000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 112.000 -68.784 43.216
T90 96.000 -68.784 27.216
T50 32.000 -36.784 -4.784
Peak 1.000 2.716 3.716
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
22.6031 +55.7362 0.0060 49.3 13.3 20.4390 32.1 TRIG_00887512
------------------------------------------
Foreground time interval of the image:
-60.784 -34.440 (delta_t = 26.344 [sec])
-33.784 37.017 (delta_t = 70.801 [sec])
Background time interval of the image:
-212.784 -117.652 (delta_t = 95.132 [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
-60.784000 -34.440500
-33.784000 43.216000
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.05828 ( -0.0575695 0.056887 )
Norm@50keV : 1.37602E-02 ( -0.000457498 0.000455327 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 66.89 using 59 PHA bins.
# Reduced chi-squared = 1.173 for 57 degrees of freedom
# Null hypothesis probability = 1.738874e-01
Photon flux (15-150 keV) in 103.3 sec: 1.59027 ( -0.0557966 0.0560411 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.50654e-05 ( -4.7085e-07 4.70786e-07 ) ergs/cm2
Cutoff power-law model
Multiple GTIs in the spectrum
tstart tstop
-60.784000 -34.440500
-33.784000 43.216000
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.05320 ( -0.0588489 0.0565123 )
Epeak [keV] : 9999.36 ( -9999.36 -9999.36 )
Norm@50keV : 1.38369E-02 ( -0.000433527 0.00244516 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 66.92 using 59 PHA bins.
# Reduced chi-squared = 1.195 for 56 degrees of freedom
# Null hypothesis probability = 1.506957e-01
Photon flux (15-150 keV) in 103.3 sec: 1.59039 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 1.50682e-05 ( -4.67949e-07 4.71978e-07 ) ergs/cm2
Band function
Multiple GTIs in the spectrum
tstart tstop
-60.784000 -34.440500
-33.784000 43.216000
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.866781 ( 0.866781 0.866781 )
beta : -1.05828 ( -0.0568707 0.0575907 )
Epeak [keV] : 45.3190 ( -45.319 9954.68 )
Norm@50keV : 2.38689E-02 ( -0.00826337 0 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 66.89 using 59 PHA bins.
# Reduced chi-squared = 1.216 for 55 degrees of freedom
# Null hypothesis probability = 1.306726e-01
Photon flux (15-150 keV) in 103.3 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] : 24.3996 ( )
R^2/D10^2 : 3.98708E-02 ( )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 271.98 using 59 PHA bins.
# Reduced chi-squared = 4.7716 for 57 degrees of freedom
# Null hypothesis probability = 8.904038e-30
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.314e-07 3.125e-08
25- 50 2.417e-06 1.240e-07
50-150 1.070e-05 4.344e-07
15-150 1.355e-05 4.700e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 199.363 ( )
Norm : 7.01119 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 313.36 using 59 PHA bins.
# Reduced chi-squared = 5.4975 for 57 degrees of freedom
# Null hypothesis probability = 4.392814e-37
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.803e-06 6.146e-08
25- 50 3.469e-06 1.291e-07
50-150 7.609e-06 2.588e-07
15-150 1.288e-05 4.287e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 9.57428 (-1.16482 1.29507)
R1^2/D10^2 : 0.473269 (-0.149042 0.23797)
kT2 [keV] : 42.9974 (-5.62826 8.91055)
R2^2/D10^2 : 5.97387E-03 (-0.00247168 0.00318839)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 67.65 using 59 PHA bins.
# Reduced chi-squared = 1.230 for 55 degrees of freedom
# Null hypothesis probability = 1.175966e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.038e-06 1.408e-07
25- 50 3.069e-06 2.722e-07
50-150 1.109e-05 1.160e-06
15-150 1.520e-05 1.529e-06
Peak spectrum fit
Power-law model
Time interval is from 2.716 sec. to 3.716 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.08667 ( -0.300245 0.287339 )
Norm@50keV : 2.68685E-02 ( -0.00472634 0.00469981 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 70.77 using 59 PHA bins.
# Reduced chi-squared = 1.242 for 57 degrees of freedom
# Null hypothesis probability = 1.038399e-01
Photon flux (15-150 keV) in 1 sec: 3.11257 ( -0.5639 0.567137 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.82121e-07 ( -5.16079e-08 5.18715e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 2.716 sec. to 3.716 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.520320 ( -1.45844 0.71134 )
Epeak [keV] : 149.982 ( -149.982 -149.982 )
Norm@50keV : 4.82653E-02 ( -0.025196 0.155954 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 70.07 using 59 PHA bins.
# Reduced chi-squared = 1.251 for 56 degrees of freedom
# Null hypothesis probability = 9.785372e-02
Photon flux (15-150 keV) in 1 sec: 3.05554 ( -0.57514 0.57836 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.76738e-07 ( -5.4634e-08 5.3712e-08 ) ergs/cm2
Band function
Time interval is from 2.716 sec. to 3.716 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.587643 ( -0.428928 0.92874 )
beta : 10.0000 ( -10 -10 )
Epeak [keV] : 159.735 ( -159.735 -159.735 )
Norm@50keV : 5.88687E-21 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 69.21 using 59 PHA bins.
# Reduced chi-squared = 1.258 for 55 degrees of freedom
# Null hypothesis probability = 9.420147e-02
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] : 20.8058 (-4.20603 5.8393)
R^2/D10^2 : 0.132833 (-0.0734001 0.146399)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 74.50 using 59 PHA bins.
# Reduced chi-squared = 1.307 for 57 degrees of freedom
# Null hypothesis probability = 5.970269e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.091e-08 3.931e-09
25- 50 5.574e-08 1.733e-08
50-150 1.797e-07 5.535e-08
15-150 2.463e-07 7.515e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 200.000 (-49.9782 -200)
Norm : 13.0096 (-2.33413 2.33413)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 77.55 using 59 PHA bins.
# Reduced chi-squared = 1.361 for 57 degrees of freedom
# Null hypothesis probability = 3.646377e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.241e-08 1.917e-08
25- 50 6.235e-08 3.592e-08
50-150 1.368e-07 7.940e-08
15-150 2.315e-07 1.313e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 10.5834 (-5.5431 5.48338)
R1^2/D10^2 : 0.689187 (-0.507183 1.0741)
kT2 [keV] : 38.7089 (-34.5173 -39.7227)
R2^2/D10^2 : 1.40931E-02 (-0.0128228 0.0492669)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 69.31 using 59 PHA bins.
# Reduced chi-squared = 1.260 for 55 degrees of freedom
# Null hypothesis probability = 9.275841e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.878e-08 1.100e-08
25- 50 6.182e-08 3.426e-08
50-150 1.992e-07 1.063e-07
15-150 2.798e-07 1.482e-07
Plot creation:
Mon Feb 4 16:53:49 EST 2019