batgrbproduct Analysis for Trigger=654803
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): Tue Sep 8 20:25:15 EDT 2015
Host Name: bat1
Current Working Dir: /local/data/bat1/prebascript/trigger654803/GCN5_download_cron
======================================================================
Trigger: 00654803 Segment: 000
BAT Trigger Time: 463361202.88 [s; MET]
Trigger Stop: 463361203.904 [s; MET]
UTC: 2015-09-07T23:26:27.776600 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 255.21911343847 Dec: -63.8189835807845 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 7.04
Image Trigger?: NO
Rate S/N Ratio: 11.13552872566 [ if not an image trigger ]
Image S/N Ratio: 7.04
Flight Position: [ source = BAT ]
RA: 255.21911343847 Dec: -63.8189835807845 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 255.264911840702 Dec: -63.7975815873611 [deg; J2000]
{ 17h 01m 03.6s , -63d 47' 51.3" }
+/- 1.79471138661127 [arcmin] (estimated 90% radius based on SNR)
+/- 0.795698771334477 [arcmin] (formal 1-sigma fit error)
SNR: 13.1907328701774
Angular difference between Flight and Ground position is 1.766350 arcmin
Partial Coding Fraction: 0.5078125 [ including projection effects ]
Duration
T90: 50.9839999675751 +/- 11.1201533805453
Measured from: -0.643999874591827
to: 50.3400000929832 [s; relative to TRIGTIME]
T50: 23.4959999322891 +/- 9.63218291771381
Measured from: 3.68000012636185
to: 27.176000058651 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 0.592000007629395
to: 1.59200000762939 [s; relative to TRIGTIME]
Total Fluence
Measured from: -1.48000001907349
to: 64.527999997139 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.350426 0.824768 0.534639 0.085859
0.068140 0.071273 0.063728 0.060430 [error]
Peak 0.012345 0.047763 0.045614 0.016667
0.008693 0.009302 0.008816 0.007865 [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 1.62e-07 3.03e-07 4.35e-07 1.32e-06 1.24e-06 2.22e-06 erg/cm2
Error 2.92e-08 3.44e-08 6.23e-08 3.98e-07 1.53e-07 4.49e-07 erg/cm2
Peak flux Power-law 2.02e-01 2.89e-01 3.08e-01 6.08e-01 9.89e-01 1.41e+00 ph/cm2/s
Error 9.53e-02 8.43e-02 6.77e-02 2.95e-01 2.23e-01 3.27e-01 ph/cm2/s
Fluence Cutoff-PL 1.32e-07 3.46e-07 4.53e-07 2.69e-07 1.11e-06 1.20e-06 erg/cm2
Error 3.52e-08 4.67e-08 7.41e-08 3.12e-07 1.70e-07 3.49e-07 erg/cm2
Peak flux Cutoff-PL 1.78e-01 2.96e-01 3.26e-01 3.97e-01 9.73e-01 1.20e+00 ph/cm2/s
Error 1.14e-01 9.17e-02 8.65e-02 4.62e-01 2.28e-01 4.55e-01 ph/cm2/s
Fluence Band 1.25e-07 3.56e-07 4.30e-07 6.29e-07 1.14e-06 1.54e-06 erg/cm2
Error -------- -------- -------- -------- -------- 5.58e-07 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 1.477 0.182 - - 1.97e-03 2.21e-04 60.030 57
CPL 0.152 1.032 67.0 28.4 9.54e-03 1.86e-02 53.280 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 0.910 0.382 - - 8.61e-03 1.93e-03 57.200 57
CPL 0.457 0.779 200.4 0.0 1.36e-02 4.14e-02 56.930 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: 100.160000 sec.
T50 in the 50-300 keV band: 64.576000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 66.008 -1.480 64.528
T90 50.984 -0.644 50.340
T50 23.496 3.680 27.176
Peak 1.000 0.592 1.592
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
255.2649 -63.7976 0.0145 32.5 -56.6 2.0242 13.2 TRIG_00654803
------------------------------------------
Foreground time interval of the image:
-1.480 64.528 (delta_t = 66.008 [sec])
Background time interval of the image:
-172.679 -1.480 (delta_t = 171.199 [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 -1.480 sec. to 64.528 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.47715 ( -0.181574 0.183278 )
Norm@50keV : 1.96961E-03 ( -0.000221169 0.000220086 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 60.03 using 59 PHA bins.
# Reduced chi-squared = 1.053 for 57 degrees of freedom
# Null hypothesis probability = 3.666087e-01
Photon flux (15-150 keV) in 66.01 sec: 0.244406 ( -0.0270183 0.0270561 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.23813e-06 ( -1.51602e-07 1.53495e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -1.480 sec. to 64.528 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.151659 ( -1.15571 0.907316 )
Epeak [keV] : 66.9567 ( -12.9734 43.8382 )
Norm@50keV : 9.53783E-03 ( -0.00953812 0.0276356 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 53.28 using 59 PHA bins.
# Reduced chi-squared = 0.9513 for 56 degrees of freedom
# Null hypothesis probability = 5.786608e-01
Photon flux (15-150 keV) in 66.01 sec: 0.231019 ( -0.028533 0.028536 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.11229e-06 ( -1.66662e-07 1.73963e-07 ) ergs/cm2
Band function
Time interval is from -1.480 sec. to 64.528 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 0.305130 ( -1.29873 3.46696 )
beta : -2.23711 ( 2.23543 0.599543 )
Epeak [keV] : 57.2926 ( -18.9391 45.0822 )
Norm@50keV : 1.80837E-02 ( -0.021319 3.41549 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 52.77 using 59 PHA bins.
# Reduced chi-squared = 0.9595 for 55 degrees of freedom
# Null hypothesis probability = 5.601604e-01
Photon flux (15-150 keV) in 66.01 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 1.13752e-06 ( 0 0 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 14.3468 (-1.6233 1.89556)
R^2/D10^2 : 3.36982E-02 (-0.0120686 0.0179966)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 58.38 using 59 PHA bins.
# Reduced chi-squared = 1.024 for 57 degrees of freedom
# Null hypothesis probability = 4.242686e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 9.647e-08 1.908e-08
25- 50 3.675e-07 5.779e-08
50-150 5.042e-07 1.115e-07
15-150 9.682e-07 1.327e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 199.359 (-73.4472 -199.361)
Norm : 1.00761 (-0.108937 0.109056)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 57.52 using 59 PHA bins.
# Reduced chi-squared = 1.009 for 57 degrees of freedom
# Null hypothesis probability = 4.556805e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.656e-07 9.218e-08
25- 50 3.186e-07 1.734e-07
50-150 6.987e-07 3.852e-07
15-150 1.183e-06 5.865e-07
Double BB
R1^2/D10^2 : 7.35196E-02 (-0.0398531 -0.073147)
kT2 [keV] : 27.9094 (-27.1872 -28.2122)
R2^2/D10^2 : 1.75009E-03 (-0.00166682 0.0335301)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 55.10 using 59 PHA bins.
#Fit statistic : Chi-Squared = 53.07 using 59 PHA bins.
#Fit statistic : Chi-Squared = 53.04 using 59 PHA bins.
# Reduced chi-squared = 1.002 for 55 degrees of freedom
# Reduced chi-squared = 0.9649 for 55 degrees of freedom
# Reduced chi-squared = 0.9644 for 55 degrees of freedom
# Null hypothesis probability = 4.709608e-01
# Null hypothesis probability = 5.487497e-01
# Null hypothesis probability = 5.496900e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.177e-07 2.904e-08
25- 50 3.493e-07 6.043e-08
50-150 5.322e-07 1.325e-07
15-150 9.992e-07 1.551e-07
Peak spectrum fit
Power-law model
Time interval is from 0.592 sec. to 1.592 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.909603 ( -0.401191 0.363511 )
Norm@50keV : 8.61484E-03 ( -0.0019566 0.00191248 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 57.20 using 59 PHA bins.
# Reduced chi-squared = 1.003 for 57 degrees of freedom
# Null hypothesis probability = 4.676970e-01
Photon flux (15-150 keV) in 1 sec: 0.988885 ( -0.221679 0.223659 ) ph/cm2/s
Energy fluence (15-150 keV) : 9.63233e-08 ( -2.14016e-08 2.15449e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.592 sec. to 1.592 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.457342 ( -2.01521 -0.457397 )
Epeak [keV] : 200.404 ( -200.425 -200.425 )
Norm@50keV : 1.35726E-02 ( -0.00666628 0.0761823 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 56.93 using 59 PHA bins.
# Reduced chi-squared = 1.017 for 56 degrees of freedom
# Null hypothesis probability = 4.401575e-01
Photon flux (15-150 keV) in 1 sec: 0.973318 ( -0.22746 0.229142 ) ph/cm2/s
Energy fluence (15-150 keV) : 9.46539e-08 ( -1.15987e-08 2.23561e-08 ) ergs/cm2
Band function
Time interval is from 0.592 sec. to 1.592 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 4.75947 ( -4.75947 -4.75947 )
beta : -1.06356 ( -0.552382 0.469617 )
Epeak [keV] : 36.3616 ( -36.3616 38.0656 )
Norm@50keV : 47.6685 ( -10.0284 1.93987e+06 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 56.53 using 59 PHA bins.
# Reduced chi-squared = 1.028 for 55 degrees of freedom
# Null hypothesis probability = 4.176963e-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] : 23.3658 (-5.81174 9.44658)
R^2/D10^2 : 3.01932E-02 (-0.0195126 0.0449537)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 59.37 using 59 PHA bins.
# Reduced chi-squared = 1.042 for 57 degrees of freedom
# Null hypothesis probability = 3.893768e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.964e-09 1.272e-09
25- 50 1.623e-08 7.042e-09
50-150 6.612e-08 2.852e-08
15-150 8.531e-08 3.611e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 200.000 (-58.4571 -200)
Norm : 4.08177 (-0.928808 0.928808)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 65.33 using 59 PHA bins.
# Reduced chi-squared = 1.146 for 57 degrees of freedom
# Null hypothesis probability = 2.099609e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.017e-08 6.015e-09
25- 50 1.957e-08 1.125e-08
50-150 4.291e-08 2.531e-08
15-150 7.265e-08 4.359e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 11.5884 (-11.5294 12.1646)
R1^2/D10^2 : 0.147983 (-0.0627666 41.9226)
kT2 [keV] : 42.6704 (-59.7764 -59.7765)
R2^2/D10^2 : 3.60101E-03 (-0.000689278 0.0274476)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 56.61 using 59 PHA bins.
# Reduced chi-squared = 1.029 for 55 degrees of freedom
# Null hypothesis probability = 4.148012e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.995e-09 3.457e-09
25- 50 1.825e-08 1.121e-08
50-150 6.786e-08 3.875e-08
15-150 9.110e-08 4.600e-08
Plot creation:
Tue Sep 8 20:33:12 EDT 2015