batgrbproduct Analysis for Trigger=726885
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 Dec 15 16:47:34 EST 2016
Host Name: bat1
Current Working Dir: /local/data/bat1/prebascript/trigger726885/GCN5_download_cron
======================================================================
Trigger: 00726885 Segment: 000
BAT Trigger Time: 503428827.968 [s; MET]
Trigger Stop: 503428828.992 [s; MET]
UTC: 2016-12-14T17:20:10.661200 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 3.8505559310649 Dec: 7.34197640243199 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 11.45
Image Trigger?: NO
Rate S/N Ratio: 19.4164878389476 [ if not an image trigger ]
Image S/N Ratio: 11.45
Flight Position: [ source = BAT ]
RA: 3.8505559310649 Dec: 7.34197640243199 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 3.85686360190152 Dec: 7.34187140761826 [deg; J2000]
{ 00h 15m 25.6s , +07d 20' 30.7" }
+/- 0.928749981364299 [arcmin] (estimated 90% radius based on SNR)
+/- 0.305594717262926 [arcmin] (formal 1-sigma fit error)
SNR: 33.8047097451224
Angular difference between Flight and Ground position is 0.375410 arcmin
Partial Coding Fraction: 0.6484375 [ including projection effects ]
Duration
T90: 24.8279999494553 +/- 3.13691890536705
Measured from: 0.404000103473663
to: 25.2320000529289 [s; relative to TRIGTIME]
T50: 9.67999994754791 +/- 1.1709825161053
Measured from: 3.37600010633469
to: 13.0560000538826 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 0.111999988555908
to: 1.11199998855591 [s; relative to TRIGTIME]
Total Fluence
Measured from: -0.423999965190887
to: 30.7520000338554 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 1.100435 1.346748 0.818748 0.128632
0.045562 0.048493 0.043192 0.039543 [error]
Peak 0.080029 0.097849 0.072943 0.030499
0.009402 0.009921 0.009103 0.007820 [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 3.62e-07 5.70e-07 6.75e-07 1.55e-06 2.06e-06 3.16e-06 erg/cm2
Error 2.77e-08 2.58e-08 4.47e-08 2.21e-07 1.03e-07 2.56e-07 erg/cm2
Peak flux Power-law 7.75e-01 7.52e-01 5.10e-01 5.41e-01 2.25e+00 2.58e+00 ph/cm2/s
Error 1.46e-01 8.50e-02 7.80e-02 1.72e-01 2.47e-01 2.88e-01 ph/cm2/s
Fluence Cutoff-PL 3.56e-07 5.77e-07 6.77e-07 1.27e-06 2.04e-06 2.88e-06 erg/cm2
Error 3.21e-08 3.03e-08 4.57e-08 4.25e-07 9.11e-08 4.43e-07 erg/cm2
Peak flux Cutoff-PL 7.85e-01 7.54e-01 5.05e-01 5.24e-01 2.26e+00 2.57e+00 ph/cm2/s
Error 1.46e-01 8.39e-02 7.76e-02 2.02e-01 2.47e-01 3.20e-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 1.755 0.086 - - 7.16e-03 3.43e-04 40.900 57
CPL 1.637 0.265 146.0 0.0 8.25e-03 0.00e+00 40.500 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.561 0.206 - - 1.78e-02 2.06e-03 52.940 57
CPL 2.264 0.569 96.2 0.0 7.59e-03 0.00e+00 51.940 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: 25.344000 sec.
T50 in the 50-300 keV band: 9.536000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 31.176 -0.424 30.752
T90 24.828 0.404 25.232
T50 9.680 3.376 13.056
Peak 1.000 0.112 1.112
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
3.8569 +7.3419 0.0057 26.9 -129.8 2.3302 33.8 TRIG_00726885
------------------------------------------
Foreground time interval of the image:
-0.424 10.633 (delta_t = 11.057 [sec])
Background time interval of the image:
-182.467 -0.424 (delta_t = 182.043 [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 -0.424 sec. to 30.752 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.75519 ( -0.0856676 0.0865882 )
Norm@50keV : 7.15978E-03 ( -0.000344183 0.000342065 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 40.90 using 59 PHA bins.
# Reduced chi-squared = 0.7176 for 57 degrees of freedom
# Null hypothesis probability = 9.468355e-01
Photon flux (15-150 keV) in 31.18 sec: 0.969983 ( -0.0446045 0.0446876 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.05934e-06 ( -1.02532e-07 1.0318e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.424 sec. to 30.752 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.63749 ( -0.335973 0.193443 )
Epeak [keV] : 145.951 ( )
Norm@50keV : 8.24749E-03 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 40.50 using 59 PHA bins.
# Reduced chi-squared = 0.7232 for 56 degrees of freedom
# Null hypothesis probability = 9.408834e-01
Photon flux (15-150 keV) in 31.18 sec: 0.962544 ( -0.048519 0.048516 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.03563e-06 ( -1.21677e-07 6.04736e-08 ) ergs/cm2
Band function
Time interval is from -0.424 sec. to 30.752 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 0.869860 ( -1.42043 -1.42043 )
beta : -1.80865 ( 1.80774 0.106406 )
Epeak [keV] : 27.0463 ( -25.8763 172.985 )
Norm@50keV : 0.654355 ( -0.654355 630.27 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 38.69 using 59 PHA bins.
# Reduced chi-squared = 0.7034 for 55 degrees of freedom
# Null hypothesis probability = 9.532616e-01
Photon flux (15-150 keV) in 31.18 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] : 12.4337 ( )
R^2/D10^2 : 0.195655 ( )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 163.22 using 59 PHA bins.
# Reduced chi-squared = 2.8635 for 57 degrees of freedom
# Null hypothesis probability = 3.514358e-12
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.999e-07 1.755e-08
25- 50 6.554e-07 3.321e-08
50-150 6.235e-07 6.579e-08
15-150 1.479e-06 8.029e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 113.368 (-18.764 34.5551)
Norm : 4.15214 (-0.279136 0.255055)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 43.53 using 59 PHA bins.
# Reduced chi-squared = 0.7638 for 57 degrees of freedom
# Null hypothesis probability = 9.054209e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.379e-07 2.727e-08
25- 50 5.984e-07 3.632e-08
50-150 1.038e-06 2.794e-07
15-150 1.974e-06 3.006e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 6.66266 (-0.901225 0.95841)
R1^2/D10^2 : 1.40209 (-0.523262 0.971068)
kT2 [keV] : 25.4247 (-4.06472 6.17073)
R2^2/D10^2 : 1.10588E-02 (-0.00590807 0.0101681)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 41.94 using 59 PHA bins.
# Reduced chi-squared = 0.7625 for 55 degrees of freedom
# Null hypothesis probability = 9.024255e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.337e-07 4.669e-08
25- 50 5.864e-07 6.938e-08
50-150 1.100e-06 2.745e-07
15-150 2.020e-06 3.169e-07
Peak spectrum fit
Power-law model
Time interval is from 0.112 sec. to 1.112 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.56122 ( -0.203381 0.207995 )
Norm@50keV : 1.77505E-02 ( -0.00207827 0.00204506 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 52.94 using 59 PHA bins.
# Reduced chi-squared = 0.9288 for 57 degrees of freedom
# Null hypothesis probability = 6.280734e-01
Photon flux (15-150 keV) in 1 sec: 2.25448 ( -0.246593 0.24697 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.66842e-07 ( -2.1345e-08 2.16576e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.112 sec. to 1.112 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.26384 ( -1.04193 0.0952435 )
Epeak [keV] : 96.1915 ( )
Norm@50keV : 7.58806E-03 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 51.94 using 59 PHA bins.
# Reduced chi-squared = 0.9276 for 56 degrees of freedom
# Null hypothesis probability = 6.291149e-01
Photon flux (15-150 keV) in 1 sec: 2.25684 ( -0.25053 0.24434 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.65721e-07 ( -2.0309e-08 2.2345e-08 ) ergs/cm2
Band function
Time interval is from 0.112 sec. to 1.112 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.29776 ( 1.29775 1.29775 )
beta : -1.56122 ( -0.208415 0.203425 )
Epeak [keV] : 20.7690 ( -20.7711 -20.7711 )
Norm@50keV : 3.76994E-02 ( -0.0197586 0.355479 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 52.94 using 59 PHA bins.
# Reduced chi-squared = 0.9626 for 55 degrees of freedom
# Null hypothesis probability = 5.537133e-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] : 13.9149 (-2.06521 2.54452)
R^2/D10^2 : 0.316882 (-0.140243 0.242908)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 82.10 using 59 PHA bins.
# Reduced chi-squared = 1.440 for 57 degrees of freedom
# Null hypothesis probability = 1.639578e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.297e-08 2.911e-09
25- 50 4.794e-08 8.290e-09
50-150 6.093e-08 1.638e-08
15-150 1.218e-07 2.011e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 199.363 (-82.6197 -199.363)
Norm : 9.12537 (-0.9891 0.989436)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 54.53 using 59 PHA bins.
# Reduced chi-squared = 0.9567 for 57 degrees of freedom
# Null hypothesis probability = 5.682535e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.272e-08 1.189e-08
25- 50 4.371e-08 2.401e-08
50-150 9.587e-08 5.220e-08
15-150 1.623e-07 8.915e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 4.96311 (-2.02791 4.18782)
R1^2/D10^2 : 8.97076 (-7.5821 94.072)
kT2 [keV] : 23.3309 (-6.49933 39.1521)
R2^2/D10^2 : 4.53675E-02 (-0.0413344 0.105633)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 56.58 using 59 PHA bins.
# Reduced chi-squared = 1.029 for 55 degrees of freedom
# Null hypothesis probability = 4.158845e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.562e-08 1.310e-08
25- 50 3.788e-08 1.442e-08
50-150 9.930e-08 4.588e-08
15-150 1.628e-07 5.481e-08
Plot creation:
Thu Dec 15 17:03:55 EST 2016