batgrbproduct Analysis for Trigger=644627
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): Fri Jun 19 12:12:28 EDT 2015
Host Name: bat1
Current Working Dir: /local/data/bat1/prebascript/trigger644627/GCN5_download_cron
======================================================================
Trigger: 00644627 Segment: 000
BAT Trigger Time: 456325774.144 [s; MET]
Trigger Stop: 456325774.272 [s; MET]
UTC: 2015-06-18T13:09:20.408980 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 306.014256320312 Dec: 33.8692164748506 [deg; J2000]
Catalogged Source?: YES
Point Source?: YES
GRB Indicated?: NO [ by BAT flight software ]
Image S/N Ratio: 7.42
Image Trigger?: NO
Rate S/N Ratio: 13.4536240470737 [ if not an image trigger ]
Image S/N Ratio: 7.42
Flight Position: [ source = BAT ]
RA: 306.014256320312 Dec: 33.8692164748506 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 306.009098838088 Dec: 33.8645821854855 [deg; J2000]
{ 20h 24m 02.2s , +33d 51' 52.5" }
+/- 0.517176818877796 [arcmin] (estimated 90% radius based on SNR)
+/- 0.106753797083537 [arcmin] (formal 1-sigma fit error)
SNR: 78.0199110224501
Angular difference between Flight and Ground position is 0.378599 arcmin
Partial Coding Fraction: 0.9765625 [ including projection effects ]
Duration
T90: 951.60799998045 +/- 9.97200319354453
Measured from: -110.539999902248
to: 841.068000078201 [s; relative to TRIGTIME]
T50: 522.8599999547 +/- 7.24450798771602
Measured from: 98.3720000982285
to: 621.232000052929 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: -0.0640000104904175
to: 0.935999989509583 [s; relative to TRIGTIME]
Total Fluence
Measured from: -179.587999999523
to: 957.864000022411 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 51.682506 69.188165 39.544775 5.625721
0.214688 0.224301 0.187096 0.142895 [error]
Peak 0.123521 0.168742 0.073732 0.012923
0.007464 0.007957 0.006307 0.004266 [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 1.94e-05 2.74e-05 2.85e-05 5.47e-05 9.26e-05 1.30e-04 erg/cm2
Error -------- -------- -------- -------- -------- -------- erg/cm2
Peak flux Power-law 1.26e+00 1.03e+00 5.76e-01 4.73e-01 3.07e+00 3.34e+00 ph/cm2/s
Error 1.14e-01 6.28e-02 5.00e-02 7.84e-02 1.88e-01 2.02e-01 ph/cm2/s
Fluence Cutoff-PL 1.57e-05 2.76e-05 3.08e-05 3.09e-05 8.93e-05 1.05e-04 erg/cm2
Error 6.73e-07 4.69e-07 4.67e-07 2.24e-06 1.23e-06 2.61e-06 erg/cm2
Peak flux Cutoff-PL 1.08e+00 1.18e+00 5.86e-01 1.27e-01 2.95e+00 2.98e+00 ph/cm2/s
Error 1.34e-01 8.85e-02 6.05e-02 7.04e-02 1.94e-01 2.06e-01 ph/cm2/s
Fluence Band 1.48e-05 2.79e-05 3.04e-05 4.23e-05 8.87e-05 1.16e-04 erg/cm2
Error 1.06e-06 6.58e-07 6.57e-07 -------- 1.27e-06 -------- erg/cm2
Peak flux Band 1.00e+00 1.23e+00 5.80e-01 2.93e-01 2.96e+00 3.10e+00 ph/cm2/s
Error 1.39e-01 9.52e-02 6.00e-02 1.23e-01 1.91e-01 2.17e-01 ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.939 0.000 - - 8.85e-03 0.00e+00 183.890 57
CPL 1.254 0.100 65.9 2.3 1.70e-02 1.57e-03 28.760 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.843 0.102 - - 2.19e-02 1.48e-03 74.950 57
CPL 0.603 0.563 49.5 6.6 1.07e-01 8.86e-02 55.820 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: 860.352000 sec.
T50 in the 50-300 keV band: 498.880000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 1137.450 -179.588 957.864
T90 951.608 -110.540 841.068
T50 522.860 98.372 621.232
Peak 1.000 -0.064 0.936
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
306.0091 +33.8646 0.0025 7.6 62.0 13.6335 78.0 TRIG_00644627
------------------------------------------
Foreground time interval of the image:
-97.943 8.657 (delta_t = 106.600 [sec])
Background time interval of the image:
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 -179.588 sec. to 957.864 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.93945 ( )
Norm@50keV : 8.84886E-03 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 183.89 using 59 PHA bins.
# Reduced chi-squared = 3.2261 for 57 degrees of freedom
# Null hypothesis probability = 2.875587e-15
Photon flux (15-150 keV) in 1137 sec: 1.29171 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 9.25619e-05 ( 0 0 ) ergs/cm2
Cutoff power-law model
Time interval is from -179.588 sec. to 957.864 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.25443 ( -0.100601 0.0986461 )
Epeak [keV] : 65.9185 ( -2.22578 2.44321 )
Norm@50keV : 1.70034E-02 ( -0.00148366 0.0016526 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 28.76 using 59 PHA bins.
# Reduced chi-squared = 0.5135 for 56 degrees of freedom
# Null hypothesis probability = 9.990600e-01
Photon flux (15-150 keV) in 1137 sec: 1.18892 ( -0.02532 0.02556 ) ph/cm2/s
Energy fluence (15-150 keV) : 8.92961e-05 ( -1.22478e-06 1.22705e-06 ) ergs/cm2
Band function
Time interval is from -179.588 sec. to 957.864 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.00801 ( -0.322555 0.347067 )
beta : -2.30030 ( 2.29822 0.106347 )
Epeak [keV] : 58.9493 ( -6.46506 8.89143 )
Norm@50keV : 2.28411E-02 ( -0.00714071 0.0125462 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 27.59 using 59 PHA bins.
# Reduced chi-squared = 0.5016 for 55 degrees of freedom
# Null hypothesis probability = 9.992605e-01
Photon flux (15-150 keV) in 1137 sec: 1.18582 1.17097 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 8.87276e-05 ( -8.87197e-05 -1.26707e-06 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 16.6332 ( )
R^2/D10^2 : 8.13889E-02 ( )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 1310.66 using 59 PHA bins.
# Reduced chi-squared = 22.9940 for 57 degrees of freedom
# Null hypothesis probability = 1.278045e-236
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.245e-06 1.416e-07
25- 50 2.280e-05 4.207e-07
50-150 4.471e-05 6.708e-07
15-150 7.275e-05 8.755e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 104.001 ( )
Norm : 5.35283 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 28.46 using 59 PHA bins.
# Reduced chi-squared = 0.4994 for 57 degrees of freedom
# Null hypothesis probability = 9.994387e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.504e-05 6.253e-07
25- 50 2.655e-05 8.300e-07
50-150 4.562e-05 8.476e-06
15-150 8.722e-05 8.653e-06
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 8.21167 (-0.36537 0.375313)
R1^2/D10^2 : 0.780449 (-0.113031 0.13792)
kT2 [keV] : 25.0128 (-0.965132 1.09446)
R2^2/D10^2 : 1.22487E-02 (-0.00208851 0.00232401)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 33.63 using 59 PHA bins.
# Reduced chi-squared = 0.6115 for 55 degrees of freedom
# Null hypothesis probability = 9.897768e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.254e-05 5.856e-07
25- 50 2.877e-05 6.310e-07
50-150 4.561e-05 8.925e-07
15-150 8.691e-05 1.393e-06
Peak spectrum fit
Power-law model
Time interval is from -0.064 sec. to 0.936 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.84264 ( -0.101164 0.103388 )
Norm@50keV : 2.19279E-02 ( -0.00148875 0.00147672 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 74.95 using 59 PHA bins.
# Reduced chi-squared = 1.315 for 57 degrees of freedom
# Null hypothesis probability = 5.561046e-02
Photon flux (15-150 keV) in 1 sec: 3.07303 ( -0.187961 0.188076 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.01647e-07 ( -1.37432e-08 1.38332e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.064 sec. to 0.936 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.603260 ( -0.60187 0.524762 )
Epeak [keV] : 49.4697 ( -5.25964 7.9469 )
Norm@50keV : 0.107330 ( -0.0521117 0.125084 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 55.82 using 59 PHA bins.
# Reduced chi-squared = 0.9967 for 56 degrees of freedom
# Null hypothesis probability = 4.817379e-01
Photon flux (15-150 keV) in 1 sec: 2.95002 ( -0.19426 0.19445 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.83316e-07 ( -1.4959e-08 1.538e-08 ) ergs/cm2
Band function
Time interval is from -0.064 sec. to 0.936 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -6.71100E-02 ( -0.899681 2.61685 )
beta : -2.51885 ( 2.50405 0.376874 )
Epeak [keV] : 43.2655 ( -10.5036 10.1173 )
Norm@50keV : 0.239797 ( -0.29582 17.8472 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 53.18 using 59 PHA bins.
# Reduced chi-squared = 0.9669 for 55 degrees of freedom
# Null hypothesis probability = 5.444127e-01
Photon flux (15-150 keV) in 1 sec: 2.96399 ( 4.03601 -0.19122 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.88167e-07 ( -1.8816e-07 -1.4904e-08 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 11.3358 (-0.714519 0.765114)
R^2/D10^2 : 0.943641 (-0.207357 0.263257)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 81.34 using 59 PHA bins.
# Reduced chi-squared = 1.427 for 57 degrees of freedom
# Null hypothesis probability = 1.885613e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.547e-08 2.905e-09
25- 50 7.482e-08 4.800e-09
50-150 5.555e-08 8.510e-09
15-150 1.559e-07 1.100e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 86.9042 (-15.3894 21.2278)
Norm : 14.2552 (-1.22219 1.35387)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 60.64 using 59 PHA bins.
# Reduced chi-squared = 1.064 for 57 degrees of freedom
# Null hypothesis probability = 3.460447e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.715e-08 3.185e-09
25- 50 6.235e-08 4.130e-09
50-150 9.289e-08 2.925e-08
15-150 1.924e-07 2.650e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 8.25273 (-2.15436 1.60596)
R1^2/D10^2 : 2.27282 (-0.897819 2.72092)
kT2 [keV] : 23.8920 (-8.15065 29.294)
R2^2/D10^2 : 2.97340E-02 (-0.0269439 0.161343)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 54.53 using 59 PHA bins.
# Reduced chi-squared = 0.9914 for 55 degrees of freedom
# Null hypothesis probability = 4.925413e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.164e-08 5.850e-09
25- 50 6.955e-08 1.486e-08
50-150 8.650e-08 3.709e-08
15-150 1.877e-07 5.257e-08
Plot creation:
Fri Jun 19 12:17:02 EDT 2015