batgrbproduct Analysis for Trigger=661036
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 10 downlinks after the trigger.
======================================================================
BAT GRB EVENT DATA PROCESSING REPORT
Process Script Ver: batgrbproduct v2.46
Process Start Time (local time): Fri Oct 23 12:51:00 EDT 2015
Host Name: bat1
Current Working Dir: /local/data/bat1/prebascript/trigger661036/batgroup_hand_proc
======================================================================
Trigger: 00661036 Segment: 000
BAT Trigger Time: 467215607.424 [s; MET]
Trigger Stop: 467215615.616 [s; MET]
UTC: 2015-10-22T14:06:32.116140 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 349.212869430113 Dec: 55.813346849863 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 7.24
Image Trigger?: NO
Rate S/N Ratio: 10.0995049383621 [ if not an image trigger ]
Image S/N Ratio: 7.24
Flight Position: [ source = BAT ]
RA: 349.212869430113 Dec: 55.813346849863 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 349.222878307644 Dec: 55.8120597142989 [deg; J2000]
{ 23h 16m 53.5s , +55d 48' 43.4" }
+/- 2.25687551119957 [arcmin] (estimated 90% radius based on SNR)
+/- 0.944779766888275 [arcmin] (formal 1-sigma fit error)
SNR: 9.50840161045678
Angular difference between Flight and Ground position is 0.346164 arcmin
Partial Coding Fraction: 0.3515625 [ including projection effects ]
Duration
T90: 116.65600001812 +/- 22.960223035397
Measured from: 2.14399999380112
to: 118.800000011921 [s; relative to TRIGTIME]
T50: 67.4720000624657 +/- 23.2526739722652
Measured from: 10.4159999489784
to: 77.8880000114441 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 10.3719999790192
to: 11.3719999790192 [s; relative to TRIGTIME]
Total Fluence
Measured from: -1.48800003528595
to: 132.847999989986 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.763850 0.744773 0.377546 0.135970
0.106086 0.104016 0.090151 0.080456 [error]
Peak 0.020523 0.038291 0.023331 0.015244
0.009447 0.009514 0.007735 0.007378 [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 2.42e-07 3.33e-07 3.38e-07 6.26e-07 1.11e-06 1.54e-06 erg/cm2
Error 5.18e-08 5.02e-08 8.91e-08 3.30e-07 2.04e-07 4.26e-07 erg/cm2
Peak flux Power-law 2.24e-01 2.46e-01 1.93e-01 2.48e-01 7.56e-01 9.11e-01 ph/cm2/s
Error 1.24e-01 8.41e-02 6.23e-02 1.77e-01 2.29e-01 2.58e-01 ph/cm2/s
Fluence Cutoff-PL 2.40e-07 3.37e-07 3.37e-07 5.01e-07 1.10e-06 1.41e-06 erg/cm2
Error 5.49e-08 6.40e-08 9.88e-08 5.04e-07 2.34e-07 5.58e-07 erg/cm2
Peak flux Cutoff-PL 2.26e-01 2.47e-01 1.92e-01 2.44e-01 7.57e-01 9.11e-01 ph/cm2/s
Error 1.29e-01 8.87e-02 5.11e-02 2.32e-01 2.29e-01 2.62e-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 1.976 0.291 - - 8.99e-04 1.72e-04 55.770 57
CPL 1.869 0.903 50.5 0.0 1.04e-03 0.00e+00 55.750 56
The chi2 of BB fit is Chi-Squared Chi-Squared which shows a significant improvement in the fit over a PL.
Check the BB fit.
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.353 0.524 - - 6.27e-03 1.77e-03 56.030 57
CPL 3.174 0.279 322.5 0.0 6.93e-04 0.00e+00 55.770 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: 6.592000 sec.
T50 in the 50-300 keV band: 3.520000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 134.336 -1.488 132.848
T90 116.656 2.144 118.800
T50 67.472 10.416 77.888
Peak 1.000 10.372 11.372
Image
Pre-slew 15.0-350.0 keV image (Event data)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
349.2229 55.8121 0.0202 31.8343 57.1288 2.2168162 9.508 TRIG_00661036
Foreground time interval of the image:
-1.488 132.848 (delta_t = 134.336 [sec])
Background time interval of the image:
-501.323 -484.563 (delta_t = 16.761 [sec])
-239.424 -1.488 (delta_t = 237.936 [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 -1.488 sec. to 132.848 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.97593 ( -0.279742 0.302192 )
Norm@50keV : 8.99487E-04 ( -0.000175135 0.000168842 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 55.77 using 59 PHA bins.
# Reduced chi-squared = 0.9784 for 57 degrees of freedom
# Null hypothesis probability = 5.213438e-01
Photon flux (15-150 keV) in 134.3 sec: 0.133451 ( -0.0200335 0.0200402 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.11274e-06 ( -2.00954e-07 2.07073e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -1.488 sec. to 132.848 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.86856 ( -1.49563 0.310639 )
Epeak [keV] : 50.5328 ( )
Norm@50keV : 1.03991E-03 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 55.75 using 59 PHA bins.
# Reduced chi-squared = 0.9954 for 56 degrees of freedom
# Null hypothesis probability = 4.844665e-01
Photon flux (15-150 keV) in 134.3 sec: 0.132894 ( -0.020919 0.020463 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.0991e-06 ( -2.50153e-07 2.17833e-07 ) ergs/cm2
Band function
Time interval is from -1.488 sec. to 132.848 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 0.872006 ( 1.25955 1.25955 )
beta : -2.11080 ( 2.15804 0.439873 )
Epeak [keV] : 25.6773 ( -28.408 388.14 )
Norm@50keV : 0.116013 ( -0.113306 92.4741 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 55.25 using 59 PHA bins.
# Reduced chi-squared = 1.005 for 55 degrees of freedom
# Null hypothesis probability = 4.649917e-01
Photon flux (15-150 keV) in 134.3 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] : 9.41871 (-1.5879 1.93449)
R^2/D10^2 : 7.73989E-02 (-0.0397547 0.0805472)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 64.74 using 59 PHA bins.
# Reduced chi-squared = 1.136 for 57 degrees of freedom
# Null hypothesis probability = 2.246715e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.835e-07 4.758e-08
25- 50 4.181e-07 1.006e-07
50-150 1.830e-07 7.688e-08
15-150 7.846e-07 1.802e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 67.7968 (-26.0497 58.8582)
Norm : 0.662342 (-0.148856 0.202185)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 56.22 using 59 PHA bins.
# Reduced chi-squared = 0.9863 for 57 degrees of freedom
# Null hypothesis probability = 5.043390e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.274e-07 4.942e-08
25- 50 3.586e-07 6.903e-08
50-150 4.497e-07 2.135e-07
15-150 1.036e-06 2.824e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 7.34658 (-2.90135 2.16825)
R1^2/D10^2 : 0.174643 (-0.104364 0.753259)
kT2 [keV] : 41.0221 (-27.7077 -41.7235)
R2^2/D10^2 : 2.51891E-04 (-0.000223306 0.0124273)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 55.37 using 59 PHA bins.
# Reduced chi-squared = 1.007 for 55 degrees of freedom
# Null hypothesis probability = 4.605807e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.205e-07 9.891e-08
25- 50 3.697e-07 1.618e-07
50-150 5.515e-07 2.978e-07
15-150 1.142e-06 5.319e-07
Peak spectrum fit
Power-law model
Time interval is from 10.372 sec. to 11.372 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.35342 ( -0.543676 0.504777 )
Norm@50keV : 6.26802E-03 ( -0.001767 0.00176561 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 56.03 using 59 PHA bins.
# Reduced chi-squared = 0.9830 for 57 degrees of freedom
# Null hypothesis probability = 5.113681e-01
Photon flux (15-150 keV) in 1 sec: 0.755647 ( -0.228036 0.230074 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.11719e-08 ( -1.82105e-08 1.83804e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 10.372 sec. to 11.372 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 3.17412 ( -3.71876 -3.16056 )
Epeak [keV] : 322.457 ( )
Norm@50keV : 6.93356E-04 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 55.77 using 59 PHA bins.
# Reduced chi-squared = 0.9958 for 56 degrees of freedom
# Null hypothesis probability = 4.837001e-01
Photon flux (15-150 keV) in 1 sec: 0.757178 ( -0.230544 0.226884 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.10764e-08 ( -1.85988e-08 1.83325e-08 ) ergs/cm2
Band function
Time interval is from 10.372 sec. to 11.372 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.885051 ( 0.880881 0.880881 )
beta : -1.41336 ( 1.41771 0.606995 )
Epeak [keV] : 90.3299 ( -92.1134 -92.1134 )
Norm@50keV : 1.18437E-02 ( -0.00722598 0 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 56.02 using 59 PHA bins.
# Reduced chi-squared = 1.019 for 55 degrees of freedom
# Null hypothesis probability = 4.362289e-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] : 17.5224 (-6.11955 11.8649)
R^2/D10^2 : 5.07415E-02 (-0.0501586 0.177725)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 60.24 using 59 PHA bins.
# Reduced chi-squared = 1.057 for 57 degrees of freedom
# Null hypothesis probability = 3.592708e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.145e-09 2.067e-09
25- 50 1.425e-08 8.590e-09
50-150 3.153e-08 2.054e-08
15-150 4.893e-08 2.852e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 199.363 (-113.396 -199.363)
Norm : 3.17858 (-0.904504 0.90453)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 56.70 using 59 PHA bins.
# Reduced chi-squared = 0.9947 for 57 degrees of freedom
# Null hypothesis probability = 4.863440e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 7.915e-09 4.968e-09
25- 50 1.523e-08 9.120e-09
50-150 3.339e-08 2.049e-08
15-150 5.653e-08 3.348e-08
Double BB
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 9.08778 (-3.45546 6.96155)
R1^2/D10^2 : 0.364901 (-0.311154 16.4403)
kT2 [keV] : 50.7234 (-31.5059 -50.3999)
R2^2/D10^2 : 1.44985E-03 (-0.00142593 0.0313327)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 55.57 using 59 PHA bins.
#Fit statistic : Chi-Squared = 55.51 using 59 PHA bins.
# Reduced chi-squared = 1.010 for 55 degrees of freedom
# Reduced chi-squared = 1.009 for 55 degrees of freedom
# Null hypothesis probability = 4.532545e-01
# Null hypothesis probability = 4.554319e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 6.461e-09 4.137e-09
25- 50 1.541e-08 8.635e-09
50-150 4.087e-08 2.161e-08
15-150 6.273e-08 3.138e-08
Plot creation:
Fri Oct 23 13:01:03 EDT 2015