batgrbproduct Analysis for Trigger=627170
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 Jan 20 18:16:09 EST 2015
Host Name: bat1
Current Working Dir: /local/data/bat1/prebascript/trigger627170/GCN5_download_cron
======================================================================
Trigger: 00627170 Segment: 000
BAT Trigger Time: 443431328.704 [s; MET]
Trigger Stop: 443431330.752 [s; MET]
UTC: 2015-01-20T07:21:55.628600 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 39.2941689420528 Dec: 8.07853027689263 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 7.1
Image Trigger?: NO
Rate S/N Ratio: 7.74596669241483 [ if not an image trigger ]
Image S/N Ratio: 7.1
Flight Position: [ source = BAT ]
RA: 39.2941689420528 Dec: 8.07853027689263 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 39.3088455427761 Dec: 8.06397683878282 [deg; J2000]
{ 02h 37m 14.1s , +08d 03' 50.3" }
+/- 2.27544563460261 [arcmin] (estimated 90% radius based on SNR)
+/- 1.13287749978753 [arcmin] (formal 1-sigma fit error)
SNR: 9.39774013537862
Angular difference between Flight and Ground position is 1.233958 arcmin
Partial Coding Fraction: 0.3554688 [ including projection effects ]
Duration
T90: 24.2999999523163 +/- 3.38828572567676
Measured from: -15.731999874115
to: 8.56800007820129 [s; relative to TRIGTIME]
T50: 7.41199994087219 +/- 6.89163957134754
Measured from: -4.44799989461899
to: 2.9640000462532 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 0.583999991416931
to: 1.58399999141693 [s; relative to TRIGTIME]
Total Fluence
Measured from: -17.6359999775887
to: 9.63200002908707 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.386741 0.399473 0.193802 0.025447
0.044597 0.045252 0.038724 0.033120 [error]
Peak 0.047478 0.044108 0.035003 0.010053
0.009210 0.009449 0.007742 0.006062 [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 1.42e-07 1.71e-07 1.49e-07 2.22e-07 5.40e-07 6.85e-07 erg/cm2
Error 2.41e-08 2.26e-08 3.63e-08 1.04e-07 8.39e-08 1.49e-07 erg/cm2
Peak flux Power-law 5.19e-01 4.06e-01 2.14e-01 1.63e-01 1.21e+00 1.30e+00 ph/cm2/s
Error 1.51e-01 7.98e-02 6.50e-02 9.56e-02 2.40e-01 2.56e-01 ph/cm2/s
Fluence Cutoff-PL 1.36e-07 1.87e-07 1.40e-07 6.35e-08 5.05e-07 5.26e-07 erg/cm2
Error 2.65e-08 2.41e-08 4.42e-08 1.26e-07 9.28e-08 1.83e-07 erg/cm2
Peak flux Cutoff-PL 5.01e-01 4.21e-01 2.18e-01 1.15e-01 1.20e+00 1.25e+00 ph/cm2/s
Error 1.77e-01 1.05e-01 7.01e-02 1.35e-01 2.47e-01 2.90e-01 ph/cm2/s
Fluence Band 1.36e-07 1.88e-07 1.40e-07 8.82e-08 5.11e-07 5.55e-07 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 2.200 0.251 - - 2.11e-03 3.75e-04 46.540 57
CPL 1.453 0.938 28.9 0.0 5.91e-03 0.00e+00 45.020 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.927 0.361 - - 8.36e-03 1.95e-03 60.270 57
CPL 1.640 1.282 57.8 0.0 1.20e-02 0.00e+00 60.180 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 27.268 -17.636 9.632
T90 24.300 -15.732 8.568
T50 7.412 -4.448 2.964
Peak 1.000 0.584 1.584
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
39.3088 +8.0640 0.0206 37.2 146.5 0.9807 9.4 TRIG_00627170
------------------------------------------
Foreground time interval of the image:
-17.636 9.632 (delta_t = 27.268 [sec])
Background time interval of the image:
-60.704 -17.636 (delta_t = 43.068 [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 -17.636 sec. to 9.632 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.20006 ( -0.239994 0.261829 )
Norm@50keV : 2.10785E-03 ( -0.000380127 0.000369714 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 46.54 using 59 PHA bins.
# Reduced chi-squared = 0.8165 for 57 degrees of freedom
# Null hypothesis probability = 8.373313e-01
Photon flux (15-150 keV) in 27.27 sec: 0.348974 ( -0.0443539 0.044359 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.40459e-07 ( -8.27225e-08 8.5026e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -17.636 sec. to 9.632 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.45310 ( -1.31905 0.55634 )
Epeak [keV] : 28.9071 ( )
Norm@50keV : 5.90538E-03 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 45.02 using 59 PHA bins.
# Reduced chi-squared = 0.8039 for 56 degrees of freedom
# Null hypothesis probability = 8.532536e-01
Photon flux (15-150 keV) in 27.27 sec: 0.341031 ( -0.045501 0.045586 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.04754e-07 ( -8.8543e-08 9.70239e-08 ) ergs/cm2
Band function
Time interval is from -17.636 sec. to 9.632 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.44056 ( 1.44057 1.44057 )
beta : -3.32149 ( 3.3425 1.30153 )
Epeak [keV] : 28.9555 ( -28.958 16.5348 )
Norm@50keV : 6.01936E-03 ( -0.00369155 0 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 45.00 using 59 PHA bins.
# Reduced chi-squared = 0.8181 for 55 degrees of freedom
# Null hypothesis probability = 8.299354e-01
Photon flux (15-150 keV) in 27.27 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 5.10824e-07 ( 0 0 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 8.76147 (-1.24991 1.44711)
R^2/D10^2 : 0.267605 (-0.121349 0.225266)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 55.21 using 59 PHA bins.
# Reduced chi-squared = 0.9686 for 57 degrees of freedom
# Null hypothesis probability = 5.426080e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.075e-07 2.409e-08
25- 50 2.190e-07 4.210e-08
50-150 7.689e-08 2.981e-08
15-150 4.034e-07 7.240e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 47.9345 (-13.8084 22.882)
Norm : 2.02888 (-0.416866 0.568474)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 45.06 using 59 PHA bins.
# Reduced chi-squared = 0.7904 for 57 degrees of freedom
# Null hypothesis probability = 8.737737e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.339e-07 2.396e-08
25- 50 1.894e-07 2.801e-08
50-150 1.766e-07 6.796e-08
15-150 5.000e-07 8.876e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 5.07914 (-2.60692 2.35223)
R1^2/D10^2 : 1.52962 (-1.11206 39.6445)
kT2 [keV] : 15.0130 (-4.93904 15.0141)
R2^2/D10^2 : 2.15990E-02 (-0.0204621 0.0455467)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 45.43 using 59 PHA bins.
# Reduced chi-squared = 0.8259 for 55 degrees of freedom
# Null hypothesis probability = 8.178858e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.358e-07 7.381e-08
25- 50 1.838e-07 9.480e-08
50-150 1.728e-07 1.051e-07
15-150 4.924e-07 2.524e-07
Peak spectrum fit
Power-law model
Time interval is from 0.584 sec. to 1.584 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.92651 ( -0.341633 0.380714 )
Norm@50keV : 8.36141E-03 ( -0.00199925 0.0019053 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 60.27 using 59 PHA bins.
# Reduced chi-squared = 1.057 for 57 degrees of freedom
# Null hypothesis probability = 3.583620e-01
Photon flux (15-150 keV) in 1 sec: 1.21368 ( -0.240298 0.240533 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.69014e-08 ( -1.73889e-08 1.77034e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.584 sec. to 1.584 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.63970 ( -2.00195 0.562513 )
Epeak [keV] : 57.8148 ( )
Norm@50keV : 1.20056E-02 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 60.18 using 59 PHA bins.
# Reduced chi-squared = 1.075 for 56 degrees of freedom
# Null hypothesis probability = 3.269589e-01
Photon flux (15-150 keV) in 1 sec: 1.20400 ( -0.248158 0.24573 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.55833e-08 ( -1.85611e-08 1.87491e-08 ) ergs/cm2
Band function
Time interval is from 0.584 sec. to 1.584 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.46004 ( 1.39198 1.39198 )
beta : -2.31220 ( 2.35229 2.32167 )
Epeak [keV] : 52.2914 ( -51.2488 102.824 )
Norm@50keV : 1.50966E-02 ( -0.00747448 0.179405 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 60.10 using 59 PHA bins.
# Reduced chi-squared = 1.093 for 55 degrees of freedom
# Null hypothesis probability = 2.961541e-01
Photon flux (15-150 keV) in 1 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 7.52918e-08 ( 0 0 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 11.9945 (-2.41068 2.82497)
R^2/D10^2 : 0.296267 (-0.16425 0.381679)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 65.61 using 59 PHA bins.
# Reduced chi-squared = 1.151 for 57 degrees of freedom
# Null hypothesis probability = 2.029807e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 9.015e-09 3.653e-09
25- 50 2.836e-08 1.027e-08
50-150 2.452e-08 1.095e-08
15-150 6.189e-08 2.121e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 82.1816 (-36.653 108.8)
Norm : 5.66701 (-1.47952 2.01385)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 60.31 using 59 PHA bins.
# Reduced chi-squared = 1.058 for 57 degrees of freedom
# Null hypothesis probability = 3.571715e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.473e-08 4.345e-09
25- 50 2.440e-08 6.450e-09
50-150 3.507e-08 2.381e-08
15-150 7.420e-08 3.103e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 2.39960 (-2.3987 3.07515)
R1^2/D10^2 : 216.826 (-214.044 -216.826)
kT2 [keV] : 14.0279 (-3.11991 5.14883)
R2^2/D10^2 : 0.149355 (-0.109071 0.134986)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 58.45 using 59 PHA bins.
# Reduced chi-squared = 1.063 for 55 degrees of freedom
# Null hypothesis probability = 3.498497e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.499e-08 6.987e-09
25- 50 2.368e-08 1.266e-08
50-150 3.000e-08 1.886e-08
15-150 6.867e-08 3.054e-08
Plot creation:
Tue Jan 20 18:18:12 EST 2015