batgrbproduct Analysis for Trigger=645176
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): Sun Jun 21 13:01:03 EDT 2015
Host Name: bat1
Current Working Dir: /local/data/bat1/prebascript/trigger645176/GCN5_download_cron
======================================================================
Trigger: 00645176 Segment: 000
BAT Trigger Time: 456499720 [s; MET]
Trigger Stop: 456499912 [s; MET]
UTC: 2015-06-20T13:28:26.255940 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 306.001831563682 Dec: 33.8592953111613 [deg; J2000]
Catalogged Source?: YES
Point Source?: YES
GRB Indicated?: NO [ by BAT flight software ]
Image S/N Ratio: 27.15
Image Trigger?: YES
Rate S/N Ratio: 0 [ if not an image trigger ]
Image S/N Ratio: 27.15
Flight Position: [ source = BAT ]
RA: 306.001831563682 Dec: 33.8592953111613 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 306.017414093394 Dec: 33.8608516383201 [deg; J2000]
{ 20h 24m 04.2s , +33d 51' 39.1" }
+/- 0.351869489653321 [arcmin] (estimated 90% radius based on SNR)
+/- 0.0768797637377374 [arcmin] (formal 1-sigma fit error)
SNR: 135.252297103411
Angular difference between Flight and Ground position is 0.781980 arcmin
Partial Coding Fraction: 1 [ including projection effects ]
Duration
T90: 338.615999937057 +/- 1.38662179519804
Measured from: -77.2399998903275
to: 261.37600004673 [s; relative to TRIGTIME]
T50: 195.835999965668 +/- 0.744311795309863
Measured from: -17.5879998803139
to: 178.248000085354 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: -12.0720000267029
to: -11.0720000267029 [s; relative to TRIGTIME]
Total Fluence
Measured from: -94.9359999895096
to: 301.688000023365 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 89.546246 118.470400 57.027608 6.023255
0.187987 0.202929 0.157273 0.099081 [error]
Peak 0.519745 0.552788 0.168244 0.015133
0.011055 0.011390 0.007498 0.004392 [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 4.08e-05 4.65e-05 3.79e-05 5.18e-05 1.44e-04 1.77e-04 erg/cm2
Error -------- -------- -------- -------- -------- -------- erg/cm2
Peak flux Power-law 6.18e+00 3.58e+00 1.32e+00 6.38e-01 1.14e+01 1.17e+01 ph/cm2/s
Error -------- -------- -------- -------- -------- -------- ph/cm2/s
Fluence Cutoff-PL 2.90e-05 4.76e-05 4.39e-05 2.62e-05 1.37e-04 1.47e-04 erg/cm2
Error 1.15e-06 7.75e-07 6.10e-07 1.20e-06 1.91e-06 2.32e-06 erg/cm2
Peak flux Cutoff-PL 5.08e+00 4.03e+00 1.28e+00 1.48e-01 1.05e+01 1.05e+01 ph/cm2/s
Error 3.71e-01 1.51e-01 7.85e-02 4.88e-02 4.36e-01 4.41e-01 ph/cm2/s
Fluence Band 2.82e-05 4.75e-05 4.38e-05 3.26e-05 1.36e-04 1.53e-04 erg/cm2
Error -------- 8.28e-07 6.12e-07 -------- 1.95e-06 -------- erg/cm2
Peak flux Band 3.69e+00 4.07e+00 1.54e+00 6.01e-01 9.64e+00 9.90e+00 ph/cm2/s
Error 3.37e-01 1.56e-01 7.70e-02 1.07e-01 3.81e-01 3.93e-01 ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 0.000 0.000 - - 0.00e+00 0.00e+00 0.000 0
CPL 1.198 0.088 45.2 1.8 1.08e-01 8.71e-03 36.690 56
The chi2 of BB fit is 1677.82 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 0.000 0.000 - - 0.00e+00 0.00e+00 0.000 0
CPL 0.987 0.351 29.4 3.6 3.94e-01 1.89e-01 54.070 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: 313.792000 sec.
T50 in the 50-300 keV band: 176.704000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 396.624 -94.936 301.688
T90 338.616 -77.240 261.376
T50 195.836 -17.588 178.248
Peak 1.000 -12.072 -11.072
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
306.0174 +33.8609 0.0014 0.0 -109.6 212.0054 135.3 TRIG_00645176
------------------------------------------
Foreground time interval of the image:
-15.899 119.950 (delta_t = 135.849 [sec])
121.000 301.688 (delta_t = 180.688 [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
-94.936000 119.950000
121.000000 301.688000
XSPEC12>exit
XSPEC: quit
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: ( )
Norm@50keV : ( )
------------------------------------------------------------
Photon flux (15-150 keV) in 395.6 sec: 6.63950 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 0.000144065 ( 0 0 ) ergs/cm2
Cutoff power-law model
Multiple GTIs in the spectrum
tstart tstop
-94.936000 119.950000
121.000000 301.688000
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.19777 ( -0.0890843 0.0876054 )
Epeak [keV] : 45.1998 ( -1.85155 1.68485 )
Norm@50keV : 0.108359 ( -0.00831249 0.00911236 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 36.69 using 59 PHA bins.
# Reduced chi-squared = 0.6552 for 56 degrees of freedom
# Null hypothesis probability = 9.785753e-01
Photon flux (15-150 keV) in 395.6 sec: 5.74573 ( -0.12454 0.12565 ) ph/cm2/s
Energy fluence (15-150 keV) : 0.000136692 ( -1.90284e-06 1.90837e-06 ) ergs/cm2
Band function
Multiple GTIs in the spectrum
tstart tstop
-94.936000 119.950000
121.000000 301.688000
XSPEC12>exit
XSPEC: quit
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : ( )
beta : ( )
Epeak [keV] : ( )
Norm@50keV : ( )
------------------------------------------------------------
Photon flux (15-150 keV) in 395.6 sec: 5.70759 ( 1.29241 -0.1361 ) ph/cm2/s
Energy fluence (15-150 keV) : 0.000136096 ( -0.000136093 -1.94873e-06 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 15.6119 ( )
R^2/D10^2 : 0.446802 ( )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 1677.82 using 59 PHA bins.
# Reduced chi-squared = 29.4354 for 57 degrees of freedom
# Null hypothesis probability = 2.110054e-313
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 8.954e-06 2.275e-07
25- 50 3.688e-05 7.160e-07
50-150 6.223e-05 7.121e-07
15-150 1.081e-04 1.167e-06
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 67.4732 (-1.41954 1.47422)
Norm : 30.0396 (-0.6787 0.689399)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 41.31 using 59 PHA bins.
# Reduced chi-squared = 0.7247 for 57 degrees of freedom
# Null hypothesis probability = 9.414975e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.036e-05 6.290e-07
25- 50 4.782e-05 7.516e-07
50-150 5.975e-05 6.527e-07
15-150 1.379e-04 1.701e-06
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 8.03631 (-0.294733 0.300223)
R1^2/D10^2 : 4.40785 (-0.554324 0.656017)
kT2 [keV] : 21.9627 (-0.631808 0.698767)
R2^2/D10^2 : 7.38081E-02 (-0.0108341 0.0118473)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 30.91 using 59 PHA bins.
# Reduced chi-squared = 0.5621 for 55 degrees of freedom
# Null hypothesis probability = 9.964353e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.304e-05 1.003e-06
25- 50 4.982e-05 9.890e-07
50-150 5.926e-05 9.099e-07
15-150 1.321e-04 1.958e-06
Peak spectrum fit
Power-law model
Time interval is from -12.072 sec. to -11.072 sec.
XSPEC12>exit
XSPEC: quit
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: ( )
Norm@50keV : ( )
------------------------------------------------------------
Photon flux (15-150 keV) in 1 sec: 11.4205 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 5.92433e-07 ( 0 0 ) ergs/cm2
Cutoff power-law model
Time interval is from -12.072 sec. to -11.072 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.986912 ( -0.365204 0.336656 )
Epeak [keV] : 29.3806 ( -4.16366 2.97781 )
Norm@50keV : 0.393875 ( -0.138378 0.238775 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 54.07 using 59 PHA bins.
# Reduced chi-squared = 0.9656 for 56 degrees of freedom
# Null hypothesis probability = 5.481477e-01
Photon flux (15-150 keV) in 1 sec: 10.5217 ( -0.4347 0.4372 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.38203e-07 ( -2.0969e-08 2.1192e-08 ) ergs/cm2
Band function
Time interval is from -12.072 sec. to -11.072 sec.
XSPEC12>exit
XSPEC: quit
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : ( )
beta : ( )
Epeak [keV] : ( )
Norm@50keV : ( )
------------------------------------------------------------
Photon flux (15-150 keV) in 1 sec: 9.63757 ( -2.63757 -0.38147 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.74581e-07 ( -5.74574e-07 -2.0256e-08 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 9.23759 ( )
R^2/D10^2 : 6.61142 ( )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 146.71 using 59 PHA bins.
# Reduced chi-squared = 2.5738 for 57 degrees of freedom
# Null hypothesis probability = 7.619166e-10
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.113e-07 6.200e-09
25- 50 2.462e-07 7.700e-09
50-150 1.017e-07 7.805e-09
15-150 4.591e-07 1.555e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 40.0653 (-2.57656 2.82421)
Norm : 71.8420 (-4.56999 4.87802)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 56.57 using 59 PHA bins.
# Reduced chi-squared = 0.9925 for 57 degrees of freedom
# Null hypothesis probability = 4.911569e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.651e-07 7.600e-09
25- 50 2.173e-07 7.100e-09
50-150 1.684e-07 1.260e-08
15-150 5.508e-07 1.860e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 7.13030 (-0.677115 0.600097)
R1^2/D10^2 : 15.5589 (-3.67223 5.86637)
kT2 [keV] : 19.7143 (-3.67393 5.74914)
R2^2/D10^2 : 0.126579 (-0.0850283 0.219074)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 44.97 using 59 PHA bins.
# Reduced chi-squared = 0.8177 for 55 degrees of freedom
# Null hypothesis probability = 8.306250e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.390e-07 1.200e-08
25- 50 2.308e-07 1.965e-08
50-150 1.678e-07 5.008e-08
15-150 5.376e-07 6.845e-08
Plot creation:
Sun Jun 21 13:04:04 EDT 2015