batgrbproduct Analysis for Trigger=684679
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 May 2 00:21:36 EDT 2016
Host Name: bat1
Current Working Dir: /local/data/bat1/prebascript/trigger684679/GCN5_download_cron
======================================================================
Trigger: 00684679 Segment: 000
BAT Trigger Time: 483756048 [s; MET]
Trigger Stop: 483756112 [s; MET]
UTC: 2016-05-01T00:40:31.797220 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 286.376860952753 Dec: -17.2398515642378 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 11.34
Image Trigger?: YES
Rate S/N Ratio: 0 [ if not an image trigger ]
Image S/N Ratio: 11.34
Flight Position: [ source = BAT ]
RA: 286.376860952753 Dec: -17.2398515642378 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 286.388526753716 Dec: -17.2485673931931 [deg; J2000]
{ 19h 05m 33.2s , -17d 14' 54.8" }
+/- 1.82379178759854 [arcmin] (estimated 90% radius based on SNR)
+/- 0.863339979951939 [arcmin] (formal 1-sigma fit error)
SNR: 12.891296165081
Angular difference between Flight and Ground position is 0.848734 arcmin
Partial Coding Fraction: 0.8125 [ including projection effects ]
Duration
T90: 118.119999945164 +/- 19.4731109098682
Measured from: -48.9679998755455
to: 69.1520000696182 [s; relative to TRIGTIME]
T50: 53.6159999966621 +/- 8.45801517213327
Measured from: -17.7199999094009
to: 35.8960000872612 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: -54.3799999952316
to: -53.3799999952316 [s; relative to TRIGTIME]
Total Fluence
Measured from: -54.3560000061989
to: 72.6000000238419 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 1.062208 0.955712 0.266892 0.081384
0.087591 0.079198 0.063569 0.052805 [error]
Peak 0.032179 0.025737 -0.002149 0.006891
0.010154 0.009404 0.007430 0.005640 [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 3.37e-07 3.60e-07 2.72e-07 3.35e-07 1.10e-06 1.30e-06 erg/cm2
Error 4.33e-08 3.80e-08 5.48e-08 1.27e-07 1.29e-07 2.02e-07 erg/cm2
Peak flux Power-law 2.73e-01 1.39e-01 4.39e-02 1.77e-02 4.66e-01 4.74e-01 ph/cm2/s
Error 1.49e-01 1.09e-01 5.30e-02 4.78e-02 2.20e-01 2.27e-01 ph/cm2/s
Fluence Cutoff-PL 3.07e-07 4.26e-07 2.00e-07 2.21e-08 9.53e-07 9.55e-07 erg/cm2
Error 4.93e-08 5.45e-08 7.38e-08 4.92e-08 1.26e-07 1.35e-07 erg/cm2
Peak flux Cutoff-PL 2.75e-01 1.38e-01 4.26e-02 1.67e-02 4.65e-01 4.70e-01 ph/cm2/s
Error 2.13e-01 1.23e-01 2.84e-02 3.41e-02 2.19e-01 2.44e-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 2.403 0.201 - - 8.91e-04 1.31e-04 63.090 57
CPL 0.571 1.257 28.1 9.3 1.25e-02 4.81e-02 54.260 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 2.666 1.276 - - 2.14e-03 1.84e-03 75.350 57
CPL -2.424 0.000 23.3 0.0 1.18e+01 0.00e+00 74.260 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: 0.000000 sec.
T50 in the 50-300 keV band: 0.000000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 126.956 -54.356 72.600
T90 118.120 -48.968 69.152
T50 53.616 -17.720 35.896
Peak 1.000 -54.380 -53.380
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
286.3885 -17.2486 0.0150 19.5 -118.4 1.7623 12.9 TRIG_00684679
------------------------------------------
Foreground time interval of the image:
-17.699 72.600 (delta_t = 90.299 [sec])
Background time interval of the image:
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
-54.356000 -47.750000
-47.000000 72.600000
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.40277 ( -0.194873 0.208077 )
Norm@50keV : 8.90506E-04 ( -0.000132055 0.000130735 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 63.09 using 59 PHA bins.
# Reduced chi-squared = 1.107 for 57 degrees of freedom
# Null hypothesis probability = 2.698335e-01
Photon flux (15-150 keV) in 126.2 sec: 0.165033 ( -0.0163434 0.0163475 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.09693e-06 ( -1.27471e-07 1.30635e-07 ) ergs/cm2
Cutoff power-law model
Multiple GTIs in the spectrum
tstart tstop
-54.356000 -47.750000
-47.000000 72.600000
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.571015 ( -1.39483 1.11948 )
Epeak [keV] : 28.0815 ( -13.1973 5.38438 )
Norm@50keV : 1.24526E-02 ( -0.0124526 0.083716 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 54.26 using 59 PHA bins.
# Reduced chi-squared = 0.9689 for 56 degrees of freedom
# Null hypothesis probability = 5.410434e-01
Photon flux (15-150 keV) in 126.2 sec: 0.156345 ( -0.016744 0.016844 ) ph/cm2/s
Energy fluence (15-150 keV) : 9.52783e-07 ( -1.18301e-07 1.34654e-07 ) ergs/cm2
Band function
Multiple GTIs in the spectrum
tstart tstop
-54.356000 -47.750000
-47.000000 72.600000
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.468612 ( -0.791138 1.6184 )
beta : -4.59205 ( 4.42423 1.66518 )
Epeak [keV] : 28.6977 ( -11.4082 5.02067 )
Norm@50keV : 1.42009E-02 ( -0.00701889 0.170068 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 54.22 using 59 PHA bins.
# Reduced chi-squared = 0.9858 for 55 degrees of freedom
# Null hypothesis probability = 5.043473e-01
Photon flux (15-150 keV) in 126.2 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] : 8.05663 (-0.778316 0.852741)
R^2/D10^2 : 0.176794 (-0.0602713 0.0925246)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 60.31 using 59 PHA bins.
# Reduced chi-squared = 1.058 for 57 degrees of freedom
# Null hypothesis probability = 3.570880e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.632e-07 4.625e-08
25- 50 4.664e-07 6.045e-08
50-150 1.253e-07 3.687e-08
15-150 8.550e-07 1.070e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 35.4736 (-7.18488 9.84624)
Norm : 1.16542 (-0.213122 0.268089)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 55.45 using 59 PHA bins.
# Reduced chi-squared = 0.9728 for 57 degrees of freedom
# Null hypothesis probability = 5.334136e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.231e-07 4.013e-08
25- 50 4.024e-07 4.486e-08
50-150 2.716e-07 8.985e-08
15-150 9.971e-07 1.395e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 3.59712 (-2.18383 10.4359)
R1^2/D10^2 : 2.19027 (-1.909 1138.4)
kT2 [keV] : 9.76931 (-1.64144 5.84629)
R2^2/D10^2 : 6.67425E-02 (-0.0620907 0.0808959)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 53.79 using 59 PHA bins.
# Reduced chi-squared = 0.9781 for 55 degrees of freedom
# Null hypothesis probability = 5.207617e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.091e-07 1.569e-07
25- 50 4.291e-07 2.263e-07
50-150 1.906e-07 1.107e-07
15-150 9.288e-07 4.641e-07
Peak spectrum fit
Power-law model
Time interval is from -54.380 sec. to -53.380 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.66632 ( -1.04208 1.50893 )
Norm@50keV : 2.13673E-03 ( -0.00168562 0.00199088 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 75.35 using 59 PHA bins.
# Reduced chi-squared = 1.322 for 57 degrees of freedom
# Null hypothesis probability = 5.219523e-02
Photon flux (15-150 keV) in 1 sec: 0.466422 ( -0.219359 0.220283 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.247e-08 ( -1.25931e-08 1.56386e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -54.380 sec. to -53.380 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -2.42383 ( )
Epeak [keV] : 23.2783 ( )
Norm@50keV : 11.8059 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 74.26 using 59 PHA bins.
# Reduced chi-squared = 1.326 for 56 degrees of freedom
# Null hypothesis probability = 5.169090e-02
Photon flux (15-150 keV) in 1 sec: 0.465348 0.449904 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 3.89447e-16 ( 0 0 ) ergs/cm2
Band function
Time interval is from -54.380 sec. to -53.380 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 1.34056 ( 1.30006 1.30006 )
beta : -8.09703 ( 7.37692 16.0594 )
Epeak [keV] : 22.3275 ( -22.4974 11.977 )
Norm@50keV : 1.93315 ( -2.12934 4.92037e+06 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 74.34 using 59 PHA bins.
# Reduced chi-squared = 1.352 for 55 degrees of freedom
# Null hypothesis probability = 4.223040e-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] : 5.81659 (-2.06932 2.84096)
R^2/D10^2 : 2.07277 (-2.07271 13.0856)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 74.30 using 59 PHA bins.
# Reduced chi-squared = 1.303 for 57 degrees of freedom
# Null hypothesis probability = 6.161166e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 8.899e-09 5.660e-09
25- 50 8.288e-09 5.810e-09
50-150 6.671e-10 6.575e-10
15-150 1.786e-08 1.093e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 19.1607 (-11.1783 62.9186)
Norm : 5.93171 (-5.92946 15.733)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 75.05 using 59 PHA bins.
# Reduced chi-squared = 1.317 for 57 degrees of freedom
# Null hypothesis probability = 5.478187e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 8.863e-09 5.840e-09
25- 50 7.505e-09 5.095e-09
50-150 2.089e-09 2.268e-09
15-150 1.846e-08 1.238e-08
Double BB
------------------------------------------------------------
#Fit statistic : Chi-Squared = 74.30 using 59 PHA bins.
#Fit statistic : Chi-Squared = 74.29 using 59 PHA bins.
#Fit statistic : Chi-Squared = 74.28 using 59 PHA bins.
#Fit statistic : Chi-Squared = 74.27 using 59 PHA bins.
# Reduced chi-squared = 1.351 for 55 degrees of freedom
# Reduced chi-squared = 1.351 for 55 degrees of freedom
# Reduced chi-squared = 1.351 for 55 degrees of freedom
# Reduced chi-squared = 1.350 for 55 degrees of freedom
# Null hypothesis probability = 4.249301e-02
# Null hypothesis probability = 4.257480e-02
# Null hypothesis probability = 4.265280e-02
# Null hypothesis probability = 4.272452e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 8.854e-09 1.188e-02
25- 50 8.362e-09 1.038e-01
50-150 6.933e-10 2.604e+00
15-150 1.791e-08 2.497e+00
Plot creation:
Mon May 2 00:27:09 EDT 2016