batgrbproduct analysis for trigger=1250282
batgrbproduct Analysis for Trigger=1250282
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 15 downlinks after the trigger.
======================================================================
BAT GRB EVENT DATA PROCESSING REPORT
Process Script Ver: batgrbproduct v2.48
Process Start Time (local time): Sat Aug 24 23:33:20 EDT 2024
Host Name: batproc1
Current Working Dir: /local/data/bat1/prebascript/trigger1250282/GCN5_download_cron
======================================================================
Trigger: 01250282 Segment: 000
BAT Trigger Time: 746154239.552 [s; MET]
Trigger Stop: 746154243.648 [s; MET]
UTC: 2024-08-24T01:03:25.505660 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 213.203243173578 Dec: 63.7370123171326 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 9.89
Image Trigger?: NO
Rate S/N Ratio: 9.8488578017961 [ if not an image trigger ]
Image S/N Ratio: 9.89
Flight Position: [ source = BAT ]
RA: 213.203243173578 Dec: 63.7370123171326 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 213.176064636487 Dec: 63.7352012761886 [deg; J2000]
{ 14h 12m 42.3s , +63d 44' 06.7" }
+/- 1.38375645132345 [arcmin] (estimated 90% radius based on SNR)
+/- 0.60126415933407 [arcmin] (formal 1-sigma fit error)
SNR: 19.1251381922913
Angular difference between Flight and Ground position is 0.729736 arcmin
Partial Coding Fraction: 0.7265625 [ including projection effects ]
Duration
T90: 39.4679999351501 +/- 3.44016977243773
Measured from: 0.612000107765198
to: 40.0800000429153 [s; relative to TRIGTIME]
T50: 23.62399995327 +/- 2.92770766715246
Measured from: 6.30800008773804
to: 29.932000041008 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: -0.0200001001358032
to: 0.979999899864197 [s; relative to TRIGTIME]
Total Fluence
Measured from: -0.656000018119812
to: 43.3999999761581 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.467207 0.624647 0.615488 0.193224
0.047577 0.049716 0.042787 0.035618 [error]
Peak 0.016312 0.021487 0.037380 0.021150
0.007286 0.007595 0.006793 0.005448 [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 1.35e-07 2.80e-07 4.54e-07 1.65e-06 1.26e-06 2.52e-06 erg/cm2
Error 2.04e-08 2.49e-08 4.11e-08 3.41e-07 1.03e-07 3.64e-07 erg/cm2
Peak flux Power-law 1.32e-01 1.96e-01 2.18e-01 4.59e-01 6.85e-01 1.00e+00 ph/cm2/s
Error 7.29e-02 6.75e-02 4.97e-02 2.27e-01 1.74e-01 2.43e-01 ph/cm2/s
Fluence Cutoff-PL 1.35e-07 2.81e-07 4.54e-07 1.63e-06 1.26e-06 2.50e-06 erg/cm2
Error 2.11e-08 2.49e-08 4.14e-08 5.46e-07 1.02e-07 4.94e-07 erg/cm2
Peak flux Cutoff-PL 6.90e-02 1.82e-01 2.58e-01 1.94e-01 6.29e-01 7.04e-01 ph/cm2/s
Error 9.64e-02 9.15e-02 8.21e-02 3.18e-01 1.97e-01 3.40e-01 ph/cm2/s
Fluence Band -------- -------- -------- -------- -------- -------- 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 1.304 0.138 - - 2.89e-03 2.19e-04 46.610 57
CPL 1.301 0.276 10000.0 0.0 2.90e-03 2.20e-04 46.630 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 0.846 0.422 - - 5.97e-03 1.54e-03 57.450 57
CPL -0.584 3.735 121.2 -38.1 1.94e-02 5.81e-01 56.350 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: 41.664000 sec.
T50 in the 50-300 keV band: 20.288000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 44.056 -0.656 43.400
T90 39.468 0.612 40.080
T50 23.624 6.308 29.932
Peak 1.000 -0.020 0.980
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
213.1761 +63.7352 0.0101 32.4 176.3 1.5764 19.1 TRIG_01250282
------------------------------------------
Foreground time interval of the image:
-0.656 33.249 (delta_t = 33.905 [sec])
Background time interval of the image:
-239.552 -173.422 (delta_t = 66.130 [sec])
-172.552 -0.656 (delta_t = 171.896 [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 -0.656 sec. to 43.400 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.30431 ( -0.139052 0.137378 )
Norm@50keV : 2.88620E-03 ( -0.000219102 0.000219067 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 46.61 using 59 PHA bins.
# Reduced chi-squared = 0.8178 for 57 degrees of freedom
# Null hypothesis probability = 8.353312e-01
Photon flux (15-150 keV) in 44.06 sec: 0.344605 ( -0.027773 0.0279263 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.25531e-06 ( -1.02742e-07 1.03254e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.656 sec. to 43.400 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.30053 ( -0.374518 0.177263 )
Epeak [keV] : 1.00000E+04 ( -10000 -10000 )
Norm@50keV : 2.89822E-03 ( -0.000219898 0.000219896 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 46.63 using 59 PHA bins.
# Reduced chi-squared = 0.8326 for 56 degrees of freedom
# Null hypothesis probability = 8.096170e-01
Photon flux (15-150 keV) in 44.06 sec: 0.344523 ( -0.027853 0.027836 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.25515e-06 ( -1.02285e-07 1.02228e-07 ) ergs/cm2
Band function
Time interval is from -0.656 sec. to 43.400 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.01605 ( 1.01515 1.01515 )
beta : -1.30433 ( 1.30435 0.139204 )
Epeak [keV] : 49.9100 ( -50.9014 -50.9014 )
Norm@50keV : 5.48847E-03 ( -0.0021733 0 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 46.61 using 59 PHA bins.
# Reduced chi-squared = 0.8475 for 55 degrees of freedom
# Null hypothesis probability = 7.822218e-01
Photon flux (15-150 keV) in 44.06 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] : 19.1742 (-1.95802 2.26707)
R^2/D10^2 : 1.73036E-02 (-0.00543015 0.00766861)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 93.98 using 59 PHA bins.
# Reduced chi-squared = 1.649 for 57 degrees of freedom
# Null hypothesis probability = 1.483360e-03
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.491e-08 9.195e-09
25- 50 2.658e-07 3.100e-08
50-150 7.195e-07 9.142e-08
15-150 1.040e-06 1.165e-07
Thermal bremsstrahlung (OTTB)
XSPEC12>exit
XSPEC: quit
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 200.000 (-20.7662 -200)
Norm : 1.44555 (-0.111109 0.111109)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.586e-07 1.681e-08
25- 50 3.050e-07 3.686e-08
50-150 6.690e-07 2.075e-07
15-150 1.133e-06 3.428e-07
Double BB
XSPEC12>exit
XSPEC: quit
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 6.54034 (-1.6437 2.11954)
R1^2/D10^2 : 0.418180 (-0.257566 0.848733)
kT2 [keV] : 29.9922 (-5.63794 11.0951)
R2^2/D10^2 : 3.42562E-03 (-0.00215304 0.00352551)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.386e-07 4.880e-08
25- 50 2.714e-07 7.378e-08
50-150 8.508e-07 2.544e-07
15-150 1.261e-06 3.644e-07
Peak spectrum fit
Power-law model
Time interval is from -0.020 sec. to 0.980 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.846480 ( -0.445408 0.398006 )
Norm@50keV : 5.96920E-03 ( -0.00157769 0.0015113 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 57.45 using 59 PHA bins.
# Reduced chi-squared = 1.008 for 57 degrees of freedom
# Null hypothesis probability = 4.584610e-01
Photon flux (15-150 keV) in 1 sec: 0.685270 ( -0.172187 0.17585 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.843e-08 ( -1.57734e-08 1.58013e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.020 sec. to 0.980 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -0.583991 ( -5.66829 1.80212 )
Epeak [keV] : 121.152 ( -41.82 -118.05 )
Norm@50keV : 1.94346E-02 ( -0.0218478 1.13977 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 56.35 using 59 PHA bins.
# Reduced chi-squared = 1.006 for 56 degrees of freedom
# Null hypothesis probability = 4.616387e-01
Photon flux (15-150 keV) in 1 sec: 0.628861 ( -0.195104 0.198352 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.63163e-08 ( -1.80109e-08 1.66455e-08 ) ergs/cm2
Band function
Time interval is from -0.020 sec. to 0.980 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.765631 ( 0.765115 0.765115 )
beta : -0.850616 ( -0.396945 0.446827 )
Epeak [keV] : 14.3659 ( )
Norm@50keV : 9.09914E-03 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 57.45 using 59 PHA bins.
# Reduced chi-squared = 1.045 for 55 degrees of freedom
# Null hypothesis probability = 3.845811e-01
Photon flux (15-150 keV) in 1 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 0 ( 0 0 ) ergs/cm2
Single BB
XSPEC: quit
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 26.4071 (-6.05315 10.0618)
R^2/D10^2 : 1.50606E-02 (-0.00940209 0.0193783)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.771e-09 9.466e-10
25- 50 1.032e-08 5.259e-09
50-150 5.285e-08 2.608e-08
15-150 6.495e-08 2.805e-08
Thermal bremsstrahlung (OTTB)
XSPEC12>exit
XSPEC: quit
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 200.000 (-58.1626 -200)
Norm : 2.94410 (-0.73145 0.73145)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 7.339e-09 4.476e-09
25- 50 1.412e-08 8.375e-09
50-150 3.096e-08 1.831e-08
15-150 5.242e-08 3.113e-08
Double BB
XSPEC12>exit
XSPEC: quit
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 1.51243 (-1.49564 2.05575)
R1^2/D10^2 : 3831.42 (-4663.74 0)
kT2 [keV] : 27.4461 (-6.43887 11.1185)
R2^2/D10^2 : 1.31768E-02 (-0.00843448 0.0176759)
------------------------------------------------------------
Reduced chi-squared =
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.825e-09 1.651e-09
25- 50 9.730e-09 4.306e-09
50-150 5.325e-08 2.790e-08
15-150 6.681e-08 3.616e-08
Plot creation:
Sat Aug 24 23:41:51 EDT 2024