batgrbproduct Analysis for Trigger=553918
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): Sat Apr 20 07:38:36 EDT 2013
Host Name: gcn5
Current Working Dir: /local/data/raid16/prebascript_archive/trigger553918/GCN5_download_cron
======================================================================
Trigger: 00553918 Segment: 000
BAT Trigger Time: 388071040 [s; MET]
Trigger Stop: 388071152 [s; MET]
UTC: 2013-04-19T13:30:29.541280 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 355.270512385986 Dec: 9.97717701299357 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 7.58
Image Trigger?: YES
Rate S/N Ratio: 0 [ if not an image trigger ]
Image S/N Ratio: 7.58
Flight Position: [ source = BAT ]
RA: 355.270512385986 Dec: 9.97717701299357 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 355.2779188581 Dec: 9.90017882356512 [deg; J2000]
{ 23h 41m 06.7s , +09d 54' 00.6" }
+/- 2.57973007370883 [arcmin] (estimated 90% radius based on SNR)
+/- 1.14644646918521 [arcmin] (formal 1-sigma fit error)
SNR: 7.85516192654548
Angular difference between Flight and Ground position is 4.640581 arcmin
Partial Coding Fraction: 0.828125 [ including projection effects ]
Duration
T90: 75.6479999423027 +/- 49.6427516774232
Measured from: 44.7760001420975
to: 120.4240000844 [s; relative to TRIGTIME]
T50: 40.191999912262 +/- 18.3168975960744
Measured from: 55.8040001392365
to: 95.9960000514984 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 55.4319999814034
to: 56.4319999814034 [s; relative to TRIGTIME]
Total Fluence
Measured from: 40.0920000076294
to: 169.508000016212 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.299611 0.478988 0.309717 0.129209
0.065759 0.067691 0.059072 0.051127 [error]
Peak 0.014825 0.014315 0.008671 0.014119
0.005865 0.006079 0.005337 0.004396 [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 9.75e-08 1.86e-07 2.76e-07 8.78e-07 7.79e-07 1.44e-06 erg/cm2
Error 2.66e-08 3.13e-08 5.84e-08 4.02e-07 1.42e-07 4.47e-07 erg/cm2
Peak flux Power-law 1.20e-01 1.10e-01 6.96e-02 6.75e-02 3.28e-01 3.67e-01 ph/cm2/s
Error 1.08e-01 5.25e-02 5.86e-02 1.34e-01 2.35e-01 1.64e-01 ph/cm2/s
Fluence Cutoff-PL 8.90e-08 1.97e-07 2.86e-07 4.06e-07 7.48e-07 9.78e-07 erg/cm2
Error 3.25e-08 3.97e-08 6.47e-08 4.98e-07 1.59e-07 4.85e-07 erg/cm2
Peak flux Cutoff-PL 1.30e-01 1.11e-01 6.51e-02 5.77e-02 3.29e-01 3.56e-01 ph/cm2/s
Error 8.57e-02 4.80e-02 5.84e-02 9.00e-02 1.43e-01 2.67e-01 ph/cm2/s
Fluence Band 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 erg/cm2
Error 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 erg/cm2
Peak flux Band 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 ph/cm2/s
Error 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.434 0.281 - - 6.28e-04 1.03e-04 60.550 57
CPL 0.891 1.167 102.4 0.0 1.18e-03 0.00e+00 59.950 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.657 1.154 - - 2.50e-03 1.32e-03 54.830 57
CPL 2.118 1.211 45.5 0.0 1.33e-03 0.00e+00 54.200 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: 43.264000 sec.
T50 in the 50-300 keV band: 20.672000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 129.416 40.092 169.508
T90 75.648 44.776 120.424
T50 40.192 55.804 95.996
Peak 1.000 55.432 56.432
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
355.2779 +9.9002 0.0244 23.2 -133.2 1.1631 7.9 TRIG_00553918
------------------------------------------
Foreground time interval of the image:
40.092 169.508 (delta_t = 129.416 [sec])
Background time interval of the image:
-239.000 40.092 (delta_t = 279.092 [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 40.092 sec. to 169.508 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.43436 ( -0.279231 0.282537 )
Norm@50keV : 6.27540E-04 ( -0.000103201 0.000102355 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 60.55 using 59 PHA bins.
# Reduced chi-squared = 1.062 for 57 degrees of freedom
# Null hypothesis probability = 3.490748e-01
Photon flux (15-150 keV) in 129.4 sec: 7.70401E-02 ( -0.0124762 0.0124977 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.79341e-07 ( -1.41218e-07 1.43656e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from 40.092 sec. to 169.508 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.890919 ( -1.54322 0.790457 )
Epeak [keV] : 102.386 ( )
Norm@50keV : 1.17891E-03 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 59.95 using 59 PHA bins.
# Reduced chi-squared = 1.071 for 56 degrees of freedom
# Null hypothesis probability = 3.345366e-01
Photon flux (15-150 keV) in 129.4 sec: 7.52133E-02 ( -0.0132763 0.0131176 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.47799e-07 ( -1.57899e-07 1.59123e-07 ) ergs/cm2
Band function
Time interval is from 40.092 sec. to 169.508 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.782950 ( 0.782825 0.782825 )
beta : -1.87873 ( 1.88047 0.68961 )
Epeak [keV] : 89.8137 ( -89.8388 -89.8388 )
Norm@50keV : 1.36084E-03 ( -0.000822326 0 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 59.91 using 59 PHA bins.
# Reduced chi-squared = 1.089 for 55 degrees of freedom
# Null hypothesis probability = 3.021629e-01
Photon flux (15-150 keV) in 129.4 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] : 15.3702 (-2.67025 3.44113)
R^2/D10^2 : 8.23578E-03 (-0.00416863 0.00780476)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 65.15 using 59 PHA bins.
# Reduced chi-squared = 1.143 for 57 degrees of freedom
# Null hypothesis probability = 2.142650e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.249e-08 1.691e-08
25- 50 2.132e-07 5.899e-08
50-150 3.465e-07 1.181e-07
15-150 6.122e-07 1.341e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 199.363 (-86.0153 -199.363)
Norm : 0.316975 (-0.0505247 0.0505258)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 60.60 using 59 PHA bins.
# Reduced chi-squared = 1.063 for 57 degrees of freedom
# Null hypothesis probability = 3.473327e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.021e-07 5.919e-08
25- 50 1.965e-07 1.108e-07
50-150 4.309e-07 2.404e-07
15-150 7.295e-07 4.151e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 2.19636 (-1.81108 10.7381)
R1^2/D10^2 : 16.3331 (-17.0114 2784.68)
kT2 [keV] : 17.1066 (-3.30611 -17.0901)
R2^2/D10^2 : 5.43477E-03 (-0.00477411 0.00505907)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 59.24 using 59 PHA bins.
# Reduced chi-squared = 1.077 for 55 degrees of freedom
# Null hypothesis probability = 3.234833e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 8.470e-08 3.288e-08
25- 50 1.879e-07 6.526e-08
50-150 3.895e-07 1.531e-07
15-150 6.621e-07 2.197e-07
Peak spectrum fit
Power-law model
Time interval is from 55.432 sec. to 56.432 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.65676 ( -1.17397 1.13474 )
Norm@50keV : 2.50388E-03 ( -0.00143694 0.00120618 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 54.83 using 59 PHA bins.
# Reduced chi-squared = 0.9619 for 57 degrees of freedom
# Null hypothesis probability = 5.568926e-01
Photon flux (15-150 keV) in 1 sec: 0.327725 ( -0.327725 0.143039 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.32488e-08 ( -2.32488e-08 1.34052e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 55.432 sec. to 56.432 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.11809 ( -2.34286 0.0794675 )
Epeak [keV] : 45.5238 ( )
Norm@50keV : 1.32603E-03 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 54.20 using 59 PHA bins.
# Reduced chi-squared = 0.9678 for 56 degrees of freedom
# Null hypothesis probability = 5.434740e-01
Photon flux (15-150 keV) in 1 sec: 0.328723 ( -0.143463 0.142835 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.15467e-08 ( -2.15467e-08 1.41742e-08 ) ergs/cm2
Band function
Time interval is from 55.432 sec. to 56.432 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 4.96327 ( -4.96327 -4.96327 )
beta : -2.06820 ( 2.0682 1.50211 )
Epeak [keV] : 26.9530 ( -26.953 45.1733 )
Norm@50keV : 200.736 ( -86.5555 5.75968e+06 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 54.70 using 59 PHA bins.
# Reduced chi-squared = 0.9945 for 55 degrees of freedom
# Null hypothesis probability = 4.861061e-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] : 6.97609 (-2.45812 5.36579)
R^2/D10^2 : 0.595681 (-0.595681 2.94444)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 56.78 using 59 PHA bins.
# Reduced chi-squared = 0.9962 for 57 degrees of freedom
# Null hypothesis probability = 4.832603e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.641e-09 3.057e-09
25- 50 6.313e-09 4.358e-09
50-150 1.033e-09 1.071e-09
15-150 1.199e-08 8.160e-09
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 199.357 (-199.362 -199.362)
Norm : 1.29512 (-0.573836 2.48004)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 55.47 using 59 PHA bins.
# Reduced chi-squared = 0.9732 for 57 degrees of freedom
# Null hypothesis probability = 5.325866e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.225e-09 2.165e-09
25- 50 6.204e-09 3.907e-09
50-150 1.361e-08 8.950e-09
15-150 2.303e-08 1.531e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 6.37291 (-1.90605 2.63272)
R1^2/D10^2 : 0.773315 (-0.656077 1.69684)
kT2 [keV] : 199.363 (-199.363 -199.363)
R2^2/D10^2 : 7.24327E-05 (-4.58423e-05 0.0017879)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 50.08 using 59 PHA bins.
# Reduced chi-squared = 0.9105 for 55 degrees of freedom
# Null hypothesis probability = 6.627126e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.621e-09 2.872e-09
25- 50 5.922e-09 3.671e-09
50-150 1.978e-08 5.570e-09
15-150 3.032e-08 8.730e-09
Plot creation:
Sat Apr 20 08:05:40 EDT 2013