batgrbproduct analysis for trigger=748898
batgrbproduct Analysis for Trigger=748898
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): Thu Apr 20 16:21:42 EDT 2017
Host Name: bat1
Current Working Dir: /local/data/bat1/prebascript/trigger748898/GCN5_download_cron
======================================================================
Trigger: 00748898 Segment: 000
BAT Trigger Time: 514301219.136 [s; MET]
Trigger Stop: 514301220.16 [s; MET]
UTC: 2017-04-19T13:26:40.202980 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 79.8660177495021 Dec: -21.4203767383782 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 7.66
Image Trigger?: NO
Rate S/N Ratio: 11.5325625946708 [ if not an image trigger ]
Image S/N Ratio: 7.66
Flight Position: [ source = BAT ]
RA: 79.8660177495021 Dec: -21.4203767383782 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 79.85438986751 Dec: -21.432787364505 [deg; J2000]
{ 05h 19m 25.1s , -21d 25' 58.0" }
+/- 1.73209862500441 [arcmin] (estimated 90% radius based on SNR)
+/- 0.603058081757371 [arcmin] (formal 1-sigma fit error)
SNR: 13.8771523365445
Angular difference between Flight and Ground position is 0.988067 arcmin
Partial Coding Fraction: 0.53125 [ including projection effects ]
Duration
T90: 8.17999994754791 +/- 1.99891970231214
Measured from: -0.0839998722076416
to: 8.09600007534027 [s; relative to TRIGTIME]
T50: 3.53599989414215 +/- 1.54130461418307
Measured from: 0.760000169277191
to: 4.29600006341934 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 0.467999994754791
to: 1.46799999475479 [s; relative to TRIGTIME]
Total Fluence
Measured from: -0.387999951839447
to: 8.9200000166893 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.206047 0.222797 0.108099 0.032914
0.024598 0.025926 0.022771 0.019631 [error]
Peak 0.058420 0.061713 0.035033 0.011915
0.008608 0.009231 0.008038 0.006480 [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 7.26e-08 9.51e-08 9.12e-08 1.56e-07 3.11e-07 4.14e-07 erg/cm2
Error 1.33e-08 1.26e-08 2.16e-08 7.24e-08 4.94e-08 9.68e-08 erg/cm2
Peak flux Power-law 6.35e-01 4.96e-01 2.60e-01 1.98e-01 1.48e+00 1.59e+00 ph/cm2/s
Error 1.45e-01 7.78e-02 6.59e-02 9.59e-02 2.33e-01 2.52e-01 ph/cm2/s
Fluence Cutoff-PL 7.02e-08 9.97e-08 9.05e-08 8.06e-08 3.00e-07 3.41e-07 erg/cm2
Error 1.48e-08 1.69e-08 2.35e-08 1.15e-07 5.49e-08 1.27e-07 erg/cm2
Peak flux Cutoff-PL 6.11e-01 5.20e-01 2.62e-01 1.19e-01 1.46e+00 1.51e+00 ph/cm2/s
Error 1.67e-01 1.05e-01 7.15e-02 1.84e-01 2.41e-01 2.93e-01 ph/cm2/s
Fluence Band 6.93e-08 9.92e-08 8.90e-08 8.82e-08 2.99e-07 3.49e-07 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 2.059 0.255 - - 3.60e-03 6.18e-04 53.500 57
CPL 1.678 0.815 36.0 0.0 5.96e-03 0.00e+00 53.050 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.931 0.292 - - 1.02e-02 1.96e-03 49.480 57
CPL 1.549 1.093 51.4 0.0 1.68e-02 0.00e+00 49.220 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: 1.856000 sec.
T50 in the 50-300 keV band: 0.960000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 9.308 -0.388 8.920
T90 8.180 -0.084 8.096
T50 3.536 0.760 4.296
Peak 1.000 0.468 1.468
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
79.8544 -21.4328 0.0139 40.1 5.0 0.6668 13.9 TRIG_00748898
------------------------------------------
Foreground time interval of the image:
-0.388 8.920 (delta_t = 9.308 [sec])
Background time interval of the image:
-239.136 -0.388 (delta_t = 238.748 [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 -0.388 sec. to 8.920 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.05938 ( -0.244145 0.266607 )
Norm@50keV : 3.60386E-03 ( -0.000629328 0.000607659 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 53.50 using 59 PHA bins.
# Reduced chi-squared = 0.9385 for 57 degrees of freedom
# Null hypothesis probability = 6.073194e-01
Photon flux (15-150 keV) in 9.308 sec: 0.555877 ( -0.0728085 0.0728271 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.10556e-07 ( -4.87877e-08 4.99585e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.388 sec. to 8.920 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.67772 ( -1.18105 0.448245 )
Epeak [keV] : 35.9932 ( )
Norm@50keV : 5.95909E-03 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 53.05 using 59 PHA bins.
# Reduced chi-squared = 0.9473 for 56 degrees of freedom
# Null hypothesis probability = 5.873312e-01
Photon flux (15-150 keV) in 9.308 sec: 0.548483 ( -0.075163 0.075032 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.00426e-07 ( -5.40618e-08 5.56749e-08 ) ergs/cm2
Band function
Time interval is from -0.388 sec. to 8.920 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.67786 ( 1.93124 1.93124 )
beta : -10.00000 ( 10 1.84741e-13 )
Epeak [keV] : 35.9837 ( -16.2673 -35.9837 )
Norm@50keV : 5.95672E-03 ( -0.000776737 0.0226778 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 53.05 using 59 PHA bins.
# Reduced chi-squared = 0.9645 for 55 degrees of freedom
# Null hypothesis probability = 5.495701e-01
Photon flux (15-150 keV) in 9.308 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 2.98934e-07 ( 0 0 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 9.68559 (-1.52168 1.78835)
R^2/D10^2 : 0.288416 (-0.137301 0.26752)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 65.94 using 59 PHA bins.
# Reduced chi-squared = 1.157 for 57 degrees of freedom
# Null hypothesis probability = 1.951469e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.069e-08 1.392e-08
25- 50 1.204e-07 2.287e-08
50-150 5.724e-08 2.008e-08
15-150 2.283e-07 4.612e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 62.3503 (-20.4028 36.984)
Norm : 2.85707 (-0.576464 0.735322)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 53.37 using 59 PHA bins.
# Reduced chi-squared = 0.9363 for 57 degrees of freedom
# Null hypothesis probability = 6.121413e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 6.724e-08 1.150e-08
25- 50 1.035e-07 1.587e-08
50-150 1.216e-07 4.574e-08
15-150 2.923e-07 6.115e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 5.39085 (-2.79305 2.56671)
R1^2/D10^2 : 1.90125 (-1.44001 50.7747)
kT2 [keV] : 17.7691 (-6.1629 19.3652)
R2^2/D10^2 : 1.96395E-02 (-0.0182926 0.105026)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 53.98 using 59 PHA bins.
# Reduced chi-squared = 0.9815 for 55 degrees of freedom
# Null hypothesis probability = 5.136031e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 6.922e-08 3.862e-08
25- 50 9.825e-08 5.008e-08
50-150 1.240e-07 7.256e-08
15-150 2.915e-07 1.510e-07
Peak spectrum fit
Power-law model
Time interval is from 0.468 sec. to 1.468 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.93117 ( -0.278894 0.30444 )
Norm@50keV : 1.01883E-02 ( -0.00200011 0.00192498 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 49.48 using 59 PHA bins.
# Reduced chi-squared = 0.8681 for 57 degrees of freedom
# Null hypothesis probability = 7.499814e-01
Photon flux (15-150 keV) in 1 sec: 1.48186 ( -0.233251 0.233319 ) ph/cm2/s
Energy fluence (15-150 keV) : 9.37131e-08 ( -1.7439e-08 1.78342e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.468 sec. to 1.468 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.54923 ( -1.55462 0.630899 )
Epeak [keV] : 51.4150 ( )
Norm@50keV : 1.67668E-02 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 49.22 using 59 PHA bins.
# Reduced chi-squared = 0.8790 for 56 degrees of freedom
# Null hypothesis probability = 7.272250e-01
Photon flux (15-150 keV) in 1 sec: 1.46450 ( -0.24178 0.23997 ) ph/cm2/s
Energy fluence (15-150 keV) : 9.07275e-08 ( -1.91024e-08 1.99045e-08 ) ergs/cm2
Band function
Time interval is from 0.468 sec. to 1.468 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.35706 ( 1.28583 6.19989 )
beta : -2.41438 ( 2.48364 0.809208 )
Epeak [keV] : 48.3123 ( -47.4294 67.2975 )
Norm@50keV : 2.15175E-02 ( -0.0115891 3.05874e+06 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 49.04 using 59 PHA bins.
# Reduced chi-squared = 0.8916 for 55 degrees of freedom
# Null hypothesis probability = 7.005238e-01
Photon flux (15-150 keV) in 1 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 9.04344e-08 ( 0 0 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 10.8944 (-1.93687 2.23901)
R^2/D10^2 : 0.509440 (-0.257643 0.548034)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 57.43 using 59 PHA bins.
# Reduced chi-squared = 1.008 for 57 degrees of freedom
# Null hypothesis probability = 4.592124e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.261e-08 3.468e-09
25- 50 3.521e-08 8.695e-09
50-150 2.343e-08 9.385e-09
15-150 7.125e-08 1.693e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 76.7532 (-30.0354 69.9415)
Norm : 7.07674 (-1.54242 2.02267)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 49.31 using 59 PHA bins.
# Reduced chi-squared = 0.8651 for 57 degrees of freedom
# Null hypothesis probability = 7.555896e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.831e-08 3.910e-09
25- 50 2.984e-08 6.205e-09
50-150 4.094e-08 2.719e-08
15-150 8.909e-08 3.006e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 4.28461 (-2.49564 -4.28461)
R1^2/D10^2 : 10.5373 (-9.24554 1716.38)
kT2 [keV] : 15.1312 (-3.97675 -15.1312)
R2^2/D10^2 : 0.119485 (-0.118821 0.187514)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 49.61 using 59 PHA bins.
# Reduced chi-squared = 0.9020 for 55 degrees of freedom
# Null hypothesis probability = 6.799833e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.896e-08 1.044e-08
25- 50 2.870e-08 1.515e-08
50-150 3.593e-08 2.178e-08
15-150 8.359e-08 4.342e-08
Plot creation:
Thu Apr 20 16:48:30 EDT 2017