batgrbproduct Analysis for Trigger=623368
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 Jan 4 06:48:24 EST 2015
Host Name: bat1
Current Working Dir: /local/data/bat1/prebascript/trigger623368/GCN5_download_cron
======================================================================
Trigger: 00623368 Segment: 000
BAT Trigger Time: 442008152 [s; MET]
Trigger Stop: 442008216 [s; MET]
UTC: 2015-01-03T20:02:18.996300 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 131.639444320183 Dec: -48.8904166081603 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 10.36
Image Trigger?: YES
Rate S/N Ratio: 0 [ if not an image trigger ]
Image S/N Ratio: 10.36
Flight Position: [ source = BAT ]
RA: 131.639444320183 Dec: -48.8904166081603 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 131.674434662895 Dec: -48.8958619039495 [deg; J2000]
{ 08h 46m 41.9s , -48d 53' 45.1" }
+/- 2.04418812674399 [arcmin] (estimated 90% radius based on SNR)
+/- 0.674492768752162 [arcmin] (formal 1-sigma fit error)
SNR: 10.9525980395075
Angular difference between Flight and Ground position is 1.418437 arcmin
Partial Coding Fraction: 0.671875 [ including projection effects ]
Duration
T90: 49.0879999995232 +/- 9.80709947303509
Measured from: 10.6000001430511
to: 59.6880001425743 [s; relative to TRIGTIME]
T50: 21.8880000114441 +/- 6.18287702713734
Measured from: 24.040000140667
to: 45.9280001521111 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 26.3240000009537
to: 27.3240000009537 [s; relative to TRIGTIME]
Total Fluence
Measured from: 6.05599999427795
to: 64.6800000071526 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.427352 0.694482 0.431753 0.007400
0.061331 0.062491 0.052901 0.045712 [error]
Peak 0.029520 0.025164 0.008190 0.004965
0.008221 0.008289 0.006887 0.006067 [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 1.44e-07 2.48e-07 3.26e-07 8.71e-07 9.53e-07 1.59e-06 erg/cm2
Error 2.36e-08 2.75e-08 4.96e-08 2.66e-07 1.21e-07 3.14e-07 erg/cm2
Peak flux Power-law 2.45e-01 1.68e-01 7.54e-02 4.70e-02 5.12e-01 5.36e-01 ph/cm2/s
Error 1.06e-01 6.36e-02 4.54e-02 5.74e-02 1.87e-01 1.99e-01 ph/cm2/s
Fluence Cutoff-PL 1.22e-07 3.00e-07 3.17e-07 1.10e-07 8.25e-07 8.49e-07 erg/cm2
Error 2.71e-08 4.00e-08 6.49e-08 1.28e-07 1.27e-07 1.77e-07 erg/cm2
Peak flux Cutoff-PL 2.14e-01 2.51e-01 5.44e-02 9.49e-04 5.20e-01 5.20e-01 ph/cm2/s
Error 1.19e-01 9.67e-02 6.05e-02 1.35e-02 1.79e-01 1.79e-01 ph/cm2/s
Fluence Band 1.19e-07 3.06e-07 3.02e-07 2.89e-07 8.50e-07 1.02e-06 erg/cm2
Error 2.75e-08 4.18e-08 6.62e-08 -------- -------- -------- erg/cm2
Peak flux Band 2.13e-01 2.49e-01 6.21e-02 1.81e-03 5.27e-01 5.27e-01 ph/cm2/s
Error 1.19e-01 9.68e-02 -------- -------- 1.81e-01 -------- ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.605 0.177 - - 1.74e-03 2.05e-04 66.380 57
CPL -0.033 1.007 54.2 12.8 1.43e-02 3.04e-02 54.700 56
The chi2 of BB fit is 59.47 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 2.147 0.609 - - 3.18e-03 1.53e-03 50.880 57
CPL -1.155 0.802 35.0 13.5 3.80e-01 6.36e+05 46.500 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 58.624 6.056 64.680
T90 49.088 10.600 59.688
T50 21.888 24.040 45.928
Peak 1.000 26.324 27.324
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
131.6744 -48.8959 0.0176 20.1 66.0 1.4337 11.0 TRIG_00623368
------------------------------------------
Foreground time interval of the image:
6.056 64.680 (delta_t = 58.624 [sec])
Background time interval of the image:
-239.000 6.056 (delta_t = 245.056 [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 6.056 sec. to 64.680 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.60505 ( -0.175266 0.178124 )
Norm@50keV : 1.73955E-03 ( -0.000205693 0.000204014 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 66.38 using 59 PHA bins.
# Reduced chi-squared = 1.165 for 57 degrees of freedom
# Null hypothesis probability = 1.851204e-01
Photon flux (15-150 keV) in 58.62 sec: 0.223890 ( -0.0247404 0.0247525 ) ph/cm2/s
Energy fluence (15-150 keV) : 9.53155e-07 ( -1.19846e-07 1.21675e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from 6.056 sec. to 64.680 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -3.28240E-02 ( -1.12331 0.890657 )
Epeak [keV] : 54.2325 ( -8.44558 17.2187 )
Norm@50keV : 1.42620E-02 ( -0.0142629 0.0465912 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 54.70 using 59 PHA bins.
# Reduced chi-squared = 0.9767 for 56 degrees of freedom
# Null hypothesis probability = 5.243169e-01
Photon flux (15-150 keV) in 58.62 sec: 0.212992 ( -0.025139 0.025242 ) ph/cm2/s
Energy fluence (15-150 keV) : 8.25035e-07 ( -1.22434e-07 1.32557e-07 ) ergs/cm2
Band function
Time interval is from 6.056 sec. to 64.680 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 3.30784E-02 ( -0.779617 1.03818 )
beta : -10.0000 ( 10 1.77636e-15 )
Epeak [keV] : 54.2204 ( -7.91982 17.241 )
Norm@50keV : 1.42689E-02 ( -0.0142689 0.0466759 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 54.70 using 59 PHA bins.
# Reduced chi-squared = 0.9945 for 55 degrees of freedom
# Null hypothesis probability = 4.862011e-01
Photon flux (15-150 keV) in 58.62 sec: 0.249351 ( 6.75065 -0.031308 ) ph/cm2/s
Energy fluence (15-150 keV) : 8.50389e-07 ( 0 0 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 12.4310 (-1.38917 1.60142)
R^2/D10^2 : 5.13676E-02 (-0.0184758 0.0278892)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 59.47 using 59 PHA bins.
# Reduced chi-squared = 1.043 for 57 degrees of freedom
# Null hypothesis probability = 3.858562e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 9.863e-08 1.808e-08
25- 50 3.233e-07 4.074e-08
50-150 3.074e-07 7.665e-08
15-150 7.293e-07 9.584e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 140.207 (-50.7214 -138.728)
Norm : 0.943604 (-0.114486 0.139833)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 61.09 using 59 PHA bins.
# Reduced chi-squared = 1.072 for 57 degrees of freedom
# Null hypothesis probability = 3.312206e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.428e-07 3.130e-08
25- 50 2.621e-07 9.669e-08
50-150 5.027e-07 2.969e-07
15-150 9.076e-07 3.840e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 8.11176 (-3.32179 3.58233)
R1^2/D10^2 : 0.140681 (-0.0827951 0.401759)
kT2 [keV] : 20.2237 (-11.6126 68.4016)
R2^2/D10^2 : 5.39121E-03 (-0.00535458 0.0170151)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 53.39 using 59 PHA bins.
# Reduced chi-squared = 0.9707 for 55 degrees of freedom
# Null hypothesis probability = 5.363798e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.239e-07 6.788e-08
25- 50 3.022e-07 1.561e-07
50-150 4.268e-07 2.390e-07
15-150 8.529e-07 4.353e-07
Peak spectrum fit
Power-law model
Time interval is from 26.324 sec. to 27.324 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.14670 ( -0.548725 0.668629 )
Norm@50keV : 3.17775E-03 ( -0.00153035 0.0015265 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 50.88 using 59 PHA bins.
# Reduced chi-squared = 0.8926 for 57 degrees of freedom
# Null hypothesis probability = 7.026582e-01
Photon flux (15-150 keV) in 1 sec: 0.511539 ( -0.186907 0.187454 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.9569e-08 ( -1.24769e-08 1.36055e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 26.324 sec. to 27.324 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -1.15519 ( 1.19659 2.801 )
Epeak [keV] : 34.9766 ( -11.1767 15.7363 )
Norm@50keV : 0.380304 ( -0.445487 1.27243e+06 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 46.50 using 59 PHA bins.
# Reduced chi-squared = 0.8304 for 56 degrees of freedom
# Null hypothesis probability = 8.133141e-01
Photon flux (15-150 keV) in 1 sec: 0.519846 ( -0.177849 0.179873 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.6241e-08 ( -1.01797e-08 1.16538e-08 ) ergs/cm2
Band function
Time interval is from 26.324 sec. to 27.324 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 5.00000 ( -6.48997 -5 )
beta : -3.33041 ( 3.33081 1.17078 )
Epeak [keV] : 28.6452 ( -7.75722 8.2333 )
Norm@50keV : 311.798 ( -102.783 1980.6 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 46.27 using 59 PHA bins.
# Reduced chi-squared = 0.8412 for 55 degrees of freedom
# Null hypothesis probability = 7.930265e-01
Photon flux (15-150 keV) in 1 sec: 0.527263 ( 6.47274 -0.187075 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.71901e-08 ( 0 0 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 8.94354 (-2.51138 3.38068)
R^2/D10^2 : 0.429600 (-0.429609 1.09625)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 46.55 using 59 PHA bins.
# Reduced chi-squared = 0.8167 for 57 degrees of freedom
# Null hypothesis probability = 8.370605e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 6.668e-09 4.132e-09
25- 50 1.403e-08 8.710e-09
50-150 5.251e-09 4.251e-09
15-150 2.595e-08 1.665e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 44.5561 (-23.0764 71.3856)
Norm : 3.29456 (-1.44832 2.43666)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 48.62 using 59 PHA bins.
# Reduced chi-squared = 0.8529 for 57 degrees of freedom
# Null hypothesis probability = 7.775387e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 7.822e-09 4.849e-09
25- 50 1.076e-08 6.850e-09
50-150 9.329e-09 7.520e-09
15-150 2.791e-08 1.901e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 6.48408 (-6.54706 -6.54706)
R1^2/D10^2 : 0.482875 (-0.506081 -0.506081)
kT2 [keV] : 10.2655 (-10.4531 189.528)
R2^2/D10^2 : 0.180005 (-0.156366 -0.156366)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 46.48 using 59 PHA bins.
# Reduced chi-squared = 0.8451 for 55 degrees of freedom
# Null hypothesis probability = 7.864883e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 6.887e-09 4.514e-07
25- 50 1.356e-08 3.285e-06
50-150 6.092e-09 4.429e-05
15-150 2.654e-08 5.600e-05
Plot creation:
Sun Jan 4 06:51:52 EST 2015