batgrbproduct analysis for trigger=735331
batgrbproduct Analysis for Trigger=735331
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): Sat Jan 28 14:05:53 EST 2017
Host Name: bat1
Current Working Dir: /local/data/bat1/prebascript/trigger735331/GCN5_download_cron
======================================================================
Trigger: 00735331 Segment: 000
BAT Trigger Time: 507222827.2 [s; MET]
Trigger Stop: 507222827.328 [s; MET]
UTC: 2017-01-27T15:13:28.675820 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 19.9443848948679 Dec: -30.3376379347453 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 8.99
Image Trigger?: NO
Rate S/N Ratio: 26.5141471671257 [ if not an image trigger ]
Image S/N Ratio: 8.99
Flight Position: [ source = BAT ]
RA: 19.9443848948679 Dec: -30.3376379347453 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 19.9967077172859 Dec: -30.3403194781098 [deg; J2000]
{ 01h 19m 59.2s , -30d 20' 25.2" }
+/- 1.93125552085353 [arcmin] (estimated 90% radius based on SNR)
+/- 0.864216162487812 [arcmin] (formal 1-sigma fit error)
SNR: 11.8788909845844
Angular difference between Flight and Ground position is 2.714212 arcmin
Partial Coding Fraction: 0.75 [ including projection effects ]
Duration
T90: 0.512000024318695 +/- 0.144886159629968
Measured from: 0.048000156879425
to: 0.56000018119812 [s; relative to TRIGTIME]
T50: 0.25600004196167 +/- 0.0815843606584965
Measured from: 0.080000102519989
to: 0.336000144481659 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: -0.155999958515167
to: 0.844000041484833 [s; relative to TRIGTIME]
Total Fluence
Measured from: 0.0480000376701355
to: 0.639999985694885 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.022756 0.043015 0.053892 0.022713
0.005705 0.006559 0.006684 0.006466 [error]
Peak 0.014426 0.049103 0.063202 0.016058
0.007097 0.008283 0.008121 0.008007 [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 6.62e-09 1.78e-08 3.85e-08 2.17e-07 1.04e-07 2.80e-07 erg/cm2
Error 1.95e-09 3.13e-09 6.13e-09 8.13e-08 1.65e-08 8.44e-08 erg/cm2
Peak flux Power-law 2.08e-01 3.19e-01 3.68e-01 8.14e-01 1.14e+00 1.71e+00 ph/cm2/s
Error 7.06e-02 6.78e-02 6.28e-02 2.94e-01 1.89e-01 3.29e-01 ph/cm2/s
Fluence Cutoff-PL 6.07e-09 1.83e-08 4.00e-08 1.32e-07 1.02e-07 1.97e-07 erg/cm2
Error 2.07e-09 3.47e-09 7.32e-09 1.49e-07 1.76e-08 1.28e-07 erg/cm2
Peak flux Cutoff-PL 1.30e-01 3.44e-01 4.35e-01 2.21e-01 1.07e+00 1.13e+00 ph/cm2/s
Error 8.17e-02 8.42e-02 8.31e-02 2.32e-01 1.97e-01 2.97e-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 0.886 0.254 - - 1.55e-02 2.25e-03 48.500 57
CPL 0.520 0.802 230.3 0.0 2.27e-02 2.65e-02 48.040 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 0.795 0.272 - - 9.89e-03 1.67e-03 63.430 57
CPL -0.964 1.644 95.8 70.5 5.90e-02 1.76e-01 58.010 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: 0.512000 sec.
T50 in the 50-300 keV band: 0.320000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 0.592 0.048 0.640
T90 0.512 0.048 0.560
T50 0.256 0.080 0.336
Peak 1.000 -0.156 0.844
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
19.9967 -30.3403 0.0162 24.0 145.0 0.1541 11.9 TRIG_00735331
------------------------------------------
Foreground time interval of the image:
0.048 0.640 (delta_t = 0.592 [sec])
Background time interval of the image:
-239.200 -56.755 (delta_t = 182.445 [sec])
-55.200 0.048 (delta_t = 55.248 [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 0.048 sec. to 0.640 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.885728 ( -0.260314 0.248019 )
Norm@50keV : 1.55159E-02 ( -0.00225663 0.00224449 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 48.50 using 59 PHA bins.
# Reduced chi-squared = 0.8508 for 57 degrees of freedom
# Null hypothesis probability = 7.812457e-01
Photon flux (15-150 keV) in 0.592 sec: 1.78074 ( -0.258055 0.25848 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.03658e-07 ( -1.64369e-08 1.66287e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.048 sec. to 0.640 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.520064 ( -1.11505 0.489251 )
Epeak [keV] : 230.288 ( -230.288 -230.288 )
Norm@50keV : 2.26667E-02 ( -0.00904405 0.0440098 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 48.04 using 59 PHA bins.
# Reduced chi-squared = 0.8579 for 56 degrees of freedom
# Null hypothesis probability = 7.664677e-01
Photon flux (15-150 keV) in 0.592 sec: 1.75597 ( -0.2663 0.26566 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.01584e-07 ( -1.77292e-08 1.75131e-08 ) ergs/cm2
Band function
Time interval is from 0.048 sec. to 0.640 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 4.26698 ( 0.752399 5.75238 )
beta : -0.993215 ( 0.985387 0.329371 )
Epeak [keV] : 31.5672 ( -39.5479 191.675 )
Norm@50keV : 87.8604 ( -87.9358 38.7189 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 47.15 using 59 PHA bins.
# Reduced chi-squared = 0.8574 for 55 degrees of freedom
# Null hypothesis probability = 7.649978e-01
Photon flux (15-150 keV) in 0.592 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] : 23.6244 (-4.39602 5.92984)
R^2/D10^2 : 5.24100E-02 (-0.0254738 0.0460064)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 54.32 using 59 PHA bins.
# Reduced chi-squared = 0.9530 for 57 degrees of freedom
# Null hypothesis probability = 5.761283e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.097e-09 1.042e-09
25- 50 1.705e-08 4.526e-09
50-150 7.100e-08 1.969e-08
15-150 9.115e-08 2.143e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 200.000 (-34.2263 -200)
Norm : 6.91369 (-1.05772 1.05772)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 66.23 using 59 PHA bins.
# Reduced chi-squared = 1.162 for 57 degrees of freedom
# Null hypothesis probability = 1.885362e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.019e-08 5.793e-09
25- 50 1.960e-08 1.092e-08
50-150 4.299e-08 2.399e-08
15-150 7.277e-08 4.106e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 8.05636 (-3.56184 6.44719)
R1^2/D10^2 : 0.704012 (-0.560275 3.8348)
kT2 [keV] : 34.5759 (-10.4826 61.6545)
R2^2/D10^2 : 1.46466E-02 (-0.0137392 0.0304666)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 46.99 using 59 PHA bins.
# Reduced chi-squared = 0.8543 for 55 degrees of freedom
# Null hypothesis probability = 7.704659e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 6.397e-09 3.579e-09
25- 50 1.835e-08 9.727e-09
50-150 7.827e-08 4.330e-08
15-150 1.030e-07 5.405e-08
Peak spectrum fit
Power-law model
Time interval is from -0.156 sec. to 0.844 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.794625 ( -0.281052 0.26365 )
Norm@50keV : 9.88703E-03 ( -0.00168123 0.00166614 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 63.43 using 59 PHA bins.
# Reduced chi-squared = 1.113 for 57 degrees of freedom
# Null hypothesis probability = 2.601158e-01
Photon flux (15-150 keV) in 1 sec: 1.13654 ( -0.189078 0.189698 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.15803e-07 ( -2.03324e-08 2.05659e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.156 sec. to 0.844 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -0.963519 ( -1.94256 1.34502 )
Epeak [keV] : 95.8316 ( -23.6234 117.427 )
Norm@50keV : 5.89701E-02 ( -0.0589702 0.292346 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 58.01 using 59 PHA bins.
# Reduced chi-squared = 1.036 for 56 degrees of freedom
# Null hypothesis probability = 4.012249e-01
Photon flux (15-150 keV) in 1 sec: 1.06574 ( -0.196338 0.19759 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.04725e-07 ( -2.20046e-08 2.2696e-08 ) ergs/cm2
Band function
Time interval is from -0.156 sec. to 0.844 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 0.963670 ( -0.783198 1.19869 )
beta : -10.00000 ( 10 1.26217e-07 )
Epeak [keV] : 95.8171 ( -18.4631 117.996 )
Norm@50keV : 5.89902E-02 ( -0.00936611 0.292434 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 58.01 using 59 PHA bins.
# Reduced chi-squared = 1.055 for 55 degrees of freedom
# Null hypothesis probability = 3.650984e-01
Photon flux (15-150 keV) in 1 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 1.04785e-07 ( 0 0 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 22.7331 (-3.94955 5.40997)
R^2/D10^2 : 3.97885E-02 (-0.0190397 0.0323378)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 58.21 using 59 PHA bins.
# Reduced chi-squared = 1.021 for 57 degrees of freedom
# Null hypothesis probability = 4.304304e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.748e-09 1.194e-09
25- 50 2.020e-08 5.620e-09
50-150 7.799e-08 2.496e-08
15-150 1.019e-07 2.947e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 200.000 (-36.4487 -200)
Norm : 4.32410 (-0.781821 0.781821)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 82.50 using 59 PHA bins.
# Reduced chi-squared = 1.447 for 57 degrees of freedom
# Null hypothesis probability = 1.524968e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.077e-08 6.205e-09
25- 50 2.071e-08 1.185e-08
50-150 4.542e-08 2.617e-08
15-150 7.689e-08 4.423e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 11.2572 (-11.5861 -11.5861)
R1^2/D10^2 : 6.08287E-02 (-0.0604482 -0.0604482)
kT2 [keV] : 25.6057 (-25.7075 -25.7075)
R2^2/D10^2 : 2.45743E-02 (-0.0243514 0.0458099)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 57.96 using 59 PHA bins.
# Reduced chi-squared = 1.054 for 55 degrees of freedom
# Null hypothesis probability = 3.665896e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.381e-09 4.721e-09
25- 50 2.058e-08 2.158e-08
50-150 8.028e-08 7.825e-08
15-150 1.052e-07 1.412e-07
Plot creation:
Sat Jan 28 14:25:21 EST 2017