batgrbproduct Analysis for Trigger=676595
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): Mon Feb 29 20:06:37 EST 2016
Host Name: bat1
Current Working Dir: /local/data/bat1/prebascript/trigger676595/GCN5_download_cron
======================================================================
Trigger: 00676595 Segment: 000
BAT Trigger Time: 478373688.384 [s; MET]
Trigger Stop: 478373689.408 [s; MET]
UTC: 2016-02-28T17:34:32.475720 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 107.322435346999 Dec: 26.9564510226191 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 10.09
Image Trigger?: NO
Rate S/N Ratio: 29.9165506033032 [ if not an image trigger ]
Image S/N Ratio: 10.09
Flight Position: [ source = BAT ]
RA: 107.322435346999 Dec: 26.9564510226191 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 107.310663630657 Dec: 26.946064565477 [deg; J2000]
{ 07h 09m 14.6s , +26d 56' 45.8" }
+/- 1.35045152398585 [arcmin] (estimated 90% radius based on SNR)
+/- 0.567832859950911 [arcmin] (formal 1-sigma fit error)
SNR: 19.8024903148955
Angular difference between Flight and Ground position is 0.885861 arcmin
Partial Coding Fraction: 0.8125 [ including projection effects ]
Duration
T90: 98.3639999032021 +/- 23.3476528930744
Measured from: 0.92000013589859
to: 99.2840000391006 [s; relative to TRIGTIME]
T50: 47.1879999637604 +/- 4.8691539141045
Measured from: 11.6320000886917
to: 58.8200000524521 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: -0.00800001621246338
to: 0.991999983787537 [s; relative to TRIGTIME]
Total Fluence
Measured from: -0.00800001621246338
to: 116.103999972343 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.755481 1.043113 0.902595 0.265605
0.056181 0.058634 0.051299 0.044697 [error]
Peak 0.024422 0.036850 0.068392 0.028170
0.006022 0.006386 0.006380 0.005474 [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 2.13e-07 4.41e-07 7.13e-07 2.58e-06 1.97e-06 3.95e-06 erg/cm2
Error 2.41e-08 2.91e-08 5.12e-08 4.22e-07 1.27e-07 4.52e-07 erg/cm2
Peak flux Power-law 1.37e-01 2.71e-01 4.16e-01 1.40e+00 1.16e+00 2.22e+00 ph/cm2/s
Error 5.00e-02 5.97e-02 4.83e-02 3.96e-01 1.47e-01 3.65e-01 ph/cm2/s
Fluence Cutoff-PL 2.07e-07 4.46e-07 7.22e-07 2.11e-06 1.96e-06 3.49e-06 erg/cm2
Error 2.58e-08 3.26e-08 5.68e-08 8.95e-07 1.39e-07 6.97e-07 erg/cm2
Peak flux Cutoff-PL 1.39e-01 2.73e-01 4.16e-01 1.37e+00 1.17e+00 2.20e+00 ph/cm2/s
Error -------- -------- 4.81e-02 5.40e-01 1.47e-01 5.34e-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 1.307 0.107 - - 1.72e-03 9.99e-05 37.920 57
CPL 1.171 0.333 326.7 0.0 2.00e-03 7.67e-04 37.590 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 0.381 0.260 - - 9.60e-03 1.51e-03 40.840 57
CPL 0.383 0.309 9999.4 0.0 9.73e-03 5.28e-03 40.870 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: 69.312000 sec.
T50 in the 50-300 keV band: 42.496000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 116.112 -0.008 116.104
T90 98.364 0.920 99.284
T50 47.188 11.632 58.820
Peak 1.000 -0.008 0.992
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
107.3107 +26.9461 0.0097 21.7 35.3 0.9219 19.8 TRIG_00676595
------------------------------------------
Foreground time interval of the image:
-0.008 15.717 (delta_t = 15.725 [sec])
Background time interval of the image:
-239.384 -0.008 (delta_t = 239.376 [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 -0.008 sec. to 116.104 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.30745 ( -0.106815 0.106308 )
Norm@50keV : 1.72403E-03 ( -9.9957e-05 9.99359e-05 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 37.92 using 59 PHA bins.
# Reduced chi-squared = 0.6653 for 57 degrees of freedom
# Null hypothesis probability = 9.757570e-01
Photon flux (15-150 keV) in 116.1 sec: 0.205966 ( -0.0124448 0.0124801 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.97437e-06 ( -1.26803e-07 1.27438e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.008 sec. to 116.104 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.17111 ( -0.437276 0.228828 )
Epeak [keV] : 326.690 ( -326.69 -326.69 )
Norm@50keV : 2.00008E-03 ( -0.000361763 0.00117294 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 37.59 using 59 PHA bins.
# Reduced chi-squared = 0.6713 for 56 degrees of freedom
# Null hypothesis probability = 9.720895e-01
Photon flux (15-150 keV) in 116.1 sec: 0.204407 ( -0.013259 0.013229 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.95645e-06 ( -1.39796e-07 1.3802e-07 ) ergs/cm2
Band function
Time interval is from -0.008 sec. to 116.104 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.12519 ( 1.10789 1.10789 )
beta : -1.42926 ( 1.43945 0.230777 )
Epeak [keV] : 244.866 ( -266.637 -266.637 )
Norm@50keV : 2.11607E-03 ( -0.00043947 0 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 37.56 using 59 PHA bins.
# Reduced chi-squared = 0.6830 for 55 degrees of freedom
# Null hypothesis probability = 9.652017e-01
Photon flux (15-150 keV) in 116.1 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] : 17.8204 (-1.3673 1.52376)
R^2/D10^2 : 1.32514E-02 (-0.00319992 0.0041316)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 95.37 using 59 PHA bins.
# Reduced chi-squared = 1.673 for 57 degrees of freedom
# Null hypothesis probability = 1.089605e-03
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 9.813e-08 1.247e-08
25- 50 4.504e-07 3.384e-08
50-150 1.036e-06 1.151e-07
15-150 1.584e-06 1.155e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 200.000 (-14.7001 -200)
Norm : 0.856542 (-0.0500998 0.0500998)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 53.45 using 59 PHA bins.
# Reduced chi-squared = 0.9377 for 57 degrees of freedom
# Null hypothesis probability = 6.089857e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.477e-07 1.637e-08
25- 50 4.765e-07 3.495e-08
50-150 1.045e-06 3.010e-07
15-150 1.769e-06 2.711e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 6.76768 (-2.06824 2.75946)
R1^2/D10^2 : 0.195476 (-0.124033 0.312103)
kT2 [keV] : 27.0646 (-4.95482 11.6336)
R2^2/D10^2 : 2.80679E-03 (-0.00193471 0.00294722)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 42.72 using 59 PHA bins.
# Reduced chi-squared = 0.7767 for 55 degrees of freedom
# Null hypothesis probability = 8.862900e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.007e-07 6.857e-08
25- 50 4.404e-07 8.481e-08
50-150 1.282e-06 2.829e-07
15-150 1.923e-06 3.704e-07
Peak spectrum fit
Power-law model
Time interval is from -0.008 sec. to 0.992 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.380936 ( -0.271276 0.248899 )
Norm@50keV : 9.60019E-03 ( -0.00154281 0.0014718 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 40.84 using 59 PHA bins.
# Reduced chi-squared = 0.7166 for 57 degrees of freedom
# Null hypothesis probability = 9.475455e-01
Photon flux (15-150 keV) in 1 sec: 1.16270 ( -0.146331 0.147505 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.37259e-07 ( -1.64836e-08 1.65186e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.008 sec. to 0.992 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.382551 ( -0.376792 0.240803 )
Epeak [keV] : 9999.36 ( -9999.36 -9999.36 )
Norm@50keV : 9.73149E-03 ( -0.00157017 0.00899975 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 40.87 using 59 PHA bins.
# Reduced chi-squared = 0.7299 for 56 degrees of freedom
# Null hypothesis probability = 9.355844e-01
Photon flux (15-150 keV) in 1 sec: 1.16547 ( -0.14962 0.14445 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.37207e-07 ( -1.6365e-08 1.6582e-08 ) ergs/cm2
Band function
Time interval is from -0.008 sec. to 0.992 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.575098 ( 0.575204 0.575204 )
beta : -0.380946 ( -0.249148 0.271276 )
Epeak [keV] : 21.4764 ( -21.476 -21.476 )
Norm@50keV : 1.32990E-02 ( -0.00496894 92718.9 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 40.84 using 59 PHA bins.
# Reduced chi-squared = 0.7426 for 55 degrees of freedom
# Null hypothesis probability = 9.224280e-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] : 40.2464 (-7.63885 12.1429)
R^2/D10^2 : 8.81963E-03 (-0.00411362 0.00639342)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 45.76 using 59 PHA bins.
# Reduced chi-squared = 0.8029 for 57 degrees of freedom
# Null hypothesis probability = 8.570348e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.835e-09 5.325e-10
25- 50 1.254e-08 3.304e-09
50-150 1.208e-07 2.876e-08
15-150 1.351e-07 2.728e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 200.000 (-19.6053 -200)
Norm : 4.46159 (-0.621735 0.621735)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 103.75 using 59 PHA bins.
# Reduced chi-squared = 1.8202 for 57 degrees of freedom
# Null hypothesis probability = 1.529070e-04
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.110e-08 6.345e-09
25- 50 2.136e-08 1.190e-08
50-150 4.684e-08 2.601e-08
15-150 7.930e-08 4.460e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 3.87251 (-1.73968 2.85275)
R1^2/D10^2 : 7.33088 (-6.75476 162.961)
kT2 [keV] : 45.6568 (-9.87084 18.2448)
R2^2/D10^2 : 6.32045E-03 (-0.00334909 0.00529655)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 35.95 using 59 PHA bins.
# Reduced chi-squared = 0.6536 for 55 degrees of freedom
# Null hypothesis probability = 9.781545e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 7.229e-09 3.842e-09
25- 50 1.278e-08 4.096e-09
50-150 1.214e-07 3.545e-08
15-150 1.414e-07 3.985e-08
Plot creation:
Mon Feb 29 20:11:52 EST 2016