Analysis Summary
Notes:
- 1) No attempt has been made to eliminate the non-significant decimal places.
- 2) This batgrbproduct analysis is done using the HEASARC data.
- 3) This batgrbproduct analysis is using the flight position for the mask-weighting calculation.
======================================================================
BAT GRB EVENT DATA PROCESSING REPORT
Process Script Ver: batgrbproduct v2.48
Process Start Time: Thu Jun 19 20:47:58 EDT 2025
Host Name: batproc1
Current Working Dir: /local/data/bat1/alien/Swift_3rdBATcatalog/event/batevent_reproc/trigger1310284
======================================================================
Trigger: 01310284 Segment: 000
BAT Trigger Time: 768093993.024 [s; MET]
Trigger Stop: 768093994.048 [s; MET]
UTC: 2025-05-04T23:25:57.477920 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 269.612365657656 Dec: -40.3494533312436 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 10.17
Image Trigger?: NO
Rate S/N Ratio: 37.0270171631472 [ if not an image trigger ]
Image S/N Ratio: 10.17
Analysis Position: [ source = BAT ]
RA: 269.612365657656 Dec: -40.3494533312436 [deg; J2000]
Refined Position: [ source = BAT pre-slew burst ]
RA: 269.603951623963 Dec: -40.346433593737 [deg; J2000]
{ 17h 58m 24.9s , -40d 20' 47.2" }
+/- 1.02087152630534 [arcmin] (estimated 90% radius based on SNR)
+/- 0.402495115581185 [arcmin] (formal 1-sigma fit error)
SNR: 29.5326579873615
Angular difference between the analysis and refined position is 0.425280 arcmin
Partial Coding Fraction: 0.984375 [ including projection effects ]
Duration
T90: 51.37600004673 +/- 2.26583412156516
Measured from: -1.78800010681152
to: 49.5879999399185 [s; relative to TRIGTIME]
T50: 31.0080000162125 +/- 3.0313350523365
Measured from: 3.4799998998642
to: 34.4879999160767 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 7.7039999961853
to: 8.7039999961853 [s; relative to TRIGTIME]
Total Fluence
Measured from: -2.95600008964539
to: 53.0039999485016 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.781728 1.293667 1.053154 0.343775
0.055130 0.052327 0.044339 0.036790 [error]
Peak 0.020526 0.064744 0.102598 0.028593
0.007744 0.008124 0.007723 0.006247 [error]
[ fluence units of on-axis counts / fully illuminated detector ]
======================================================================
====== Table of the duration information =============================
Value tstart tstop
T100 55.960 -2.956 53.004
T90 51.376 -1.788 49.588
T50 31.008 3.480 34.488
Peak 1.000 7.704 8.704
====== Spectral Analysis Summary =====================================
Model : spectral model: simple power-law (PL) and cutoff power-law (CPL)
Ph_index : photon index: E^{Ph_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 both the PL model and CPL model
Nomr_90err : 90% error of the normalization
chi2 : Chi-Squared
dof : degree of freedo
=== Time-averaged spectral analysis ===
(Best model with acceptable fit: PL)
Model Ph_index Ph_90err_low Ph_90err_hi Epeak Epeak_90err_low Epeak_90err_hi Norm Nomr_90err_low Norm_90err_hi chi2 dof
PL -1.264 -0.082 0.082 - - - 4.07e-03 -1.79e-04 1.79e-04 38.670 57
CPL -1.151 -0.158 0.334 413.185 -413.185 -413.185 4.59e-03 -6.64e-04 1.89e-03 38.300 56
=== 1-s peak spectral analysis ===
(Best model with acceptable fit: N/A)
Model Ph_index Ph_90err_low Ph_90err_hi Epeak Epeak_90err_low Epeak_90err_hi Norm Nomr_90err_low Norm_90err_hi chi2 dof
PL -0.684 -0.184 0.194 - - - 1.39e-02 -1.63e-03 1.60e-03 73.840 57
CPL 0.483 -0.891 1.178 135.612 -36.476 207.313 3.95e-02 -2.13e-02 6.23e-02 68.480 56
=== 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 PL 2.33e-07 4.95e-07 8.25e-07 3.12e-06 2.27e-06 4.68e-06 erg/cm2
90%_error_low -2.08e-08 -2.61e-08 -4.30e-08 -3.63e-07 -1.08e-07 -3.87e-07 erg/cm2
90%_error_hi 2.15e-08 2.59e-08 4.29e-08 3.96e-07 1.08e-07 4.15e-07 erg/cm2
Peak flux PL 2.63e-01 4.32e-01 5.38e-01 1.33e+00 1.61e+00 2.56e+00 ph/cm2/s
90%_error_low -6.24e-02 -6.68e-02 -5.69e-02 -2.81e-01 -1.76e-01 -3.08e-01 ph/cm2/s
90%_error_hi 6.94e-02 6.66e-02 5.68e-02 3.32e-01 1.77e-01 3.28e-01 ph/cm2/s
Fluence CPL 2.27e-07 4.99e-07 8.33e-07 2.65e-06 2.25e-06 4.21e-06 erg/cm2
90%_error_low -2.63e-08 -2.82e-08 -4.78e-08 -9.42e-07 -1.19e-07 -9.40e-07 erg/cm2
90%_error_hi 2.08e-08 2.86e-08 4.89e-08 5.56e-07 1.18e-07 8.04e-07 erg/cm2
Peak flux CPL 1.75e-01 4.29e-01 6.12e-01 5.80e-01 1.53e+00 1.80e+00 ph/cm2/s
90%_error_low -7.77e-02 -7.99e-02 -7.87e-02 -2.38e-01 -1.85e-01 -3.14e-01 ph/cm2/s
90%_error_hi 9.04e-02 7.64e-02 8.12e-02 4.78e-01 1.86e-01 5.03e-01 ph/cm2/s
======================================================================
Image
Pre-slew 15.0-350.0 keV image (Event data)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name 269.6040 -40.3464 0.0065 10.4141 -97.6029 2.0133195 29.533 TRIG_01310284 Foreground time interval of the image: -2.956 15.277 (delta_t = 18.233 [sec]) Background time interval of the image: -41.523 -2.956 (delta_t = 38.567 [sec])
Light Curves
Note: The mask-weighted lightcurves have units of either count/det or counts/sec/det, where a det is 0.4 x 0.4 = 0.16 sq cm.
Full-time range; 1 s binning
Other quick-look light curves:
- 64 ms binning (zoomed)
- 16 ms binning (zoomed)
- 8 ms binning (zoomed)
- 2 ms binning (zoomed)
- SN=5 or 10 s binning (full-time range)
- Raw light curve
Spectra
- 64 ms binning (zoomed)
- 16 ms binning (zoomed)
- 8 ms binning (zoomed)
- 2 ms binning (zoomed)
- SN=5 or 10 s binning (full-time range)
- Raw light curve
Spectra
Notes:
- 1) The fitting includes the systematic errors.
- 2) When the burst includes telescope slew time periods, the fitting uses an average response file made from multiple 5-s response files through out the slew time plus single time preiod for the non-slew times, and weighted by the total counts in the corresponding time period using addrmf. An average response file is needed becuase a spectral fit using 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.
Time averaged spectrum fit using the average DRM
Power-law model
Time interval is from -2.956 sec. to 53.004 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.26421 ( -0.0817157 0.0823343 ) Norm@50keV : 4.06890E-03 ( -0.000179185 0.000179125 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared 38.67 using 59 bins. Reduced chi-squared = 0.678421 # Null hypothesis probability of 9.70e-01 with 57 degrees of freedom Photon flux (15-150 keV) in 55.96 sec: 0.482379 ( -0.022638 0.022697 ) ph/cm2/s Energy fluence (15-150 keV) : 2.27058e-06 ( -1.07826e-07 1.08216e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -2.956 sec. to 53.004 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.15133 ( -0.158061 0.333903 ) Epeak [keV] : 413.185 ( -413.201 -413.201 ) Norm@50keV : 4.58752E-03 ( -0.000664328 0.00188842 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared 38.30 using 59 bins. Reduced chi-squared = 0.683929 # Null hypothesis probability of 9.66e-01 with 56 degrees of freedom Photon flux (15-150 keV) in 55.96 sec: 0.479141 ( -0.024305 0.024327 ) ph/cm2/s Energy fluence (15-150 keV) : 2.25303e-06 ( -1.19067e-07 1.18055e-07 ) ergs/cm2
1-s peak spectrum fit
Power-law model
Time interval is from 7.704 sec. to 8.704 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -0.684446 ( -0.183539 0.193924 ) Norm@50keV : 1.38937E-02 ( -0.00162889 0.00160277 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared 73.84 using 59 bins. Reduced chi-squared = 1.29544 # Null hypothesis probability of 6.61e-02 with 57 degrees of freedom Photon flux (15-150 keV) in 1 sec: 1.60801 ( -0.1765 0.17737 ) ph/cm2/s Energy fluence (15-150 keV) : 1.70809e-07 ( -1.87262e-08 1.87874e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 7.704 sec. to 8.704 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: 0.483427 ( -0.890894 1.17821 ) Epeak [keV] : 135.612 ( -36.4763 207.312 ) Norm@50keV : 3.95466E-02 ( -0.0213214 0.062299 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared 68.48 using 59 bins. Reduced chi-squared = 1.22286 # Null hypothesis probability of 1.22e-01 with 56 degrees of freedom Photon flux (15-150 keV) in 1 sec: 1.53436 ( -0.18537 0.18597 ) ph/cm2/s Energy fluence (15-150 keV) : 1.64566e-07 ( -2.01052e-08 1.99058e-08 ) ergs/cm2
Time-resolved spectra
Distribution
T90 vs. Hardness ratio plot
T90 = 51.376 sec. Hardness ratio (energy fluence ratio) = 1.6653288815
S(15-50 keV) vs. S(50-150 keV) plot
S(15-50 keV) = 7.284069e-07 S(50-150 keV) = 1.542191e-06
The dash-dotted line and the dashed line traces the fluences calculated from the Band function with Epeak = 15 and 150 keV, respectively. Both lines assume a canonical values of alpha = -1 and beta = -2.5.
Mask shadow pattern
IMX = -2.431656601344392E-02, IMY = 1.821731088809568E-01
Spacecraft aspect plot
Bright source in the pre-burst/pre-slew/post-slew images
Pre-burst image of 15-350 keV band
Time interval of the image: -41.523400 -2.956000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 186.9842 -62.7767 7.1 49.3 1.0 0.3394 1.6 9.0 GX 301-2 244.9613 -15.6339 0.8 23.5 115.3 1.9429 14.3 1.1 Sco X-1 255.8782 -37.9172 10.2 1.9 2.6 0.1152 1.1 6.7 4U 1700-377 256.2314 -36.3978 9.1 0.9 55.8 0.1283 1.3 10.0 GX 349+2 262.8838 -24.8078 7.3 12.5 170.4 0.1528 1.6 7.8 GX 1+4 264.7939 -44.4532 33.4 9.9 -66.5 0.0328 0.3 2.2 4U 1735-44 268.2955 -1.3392 7.2 36.5 165.1 0.2377 1.6 8.1 SW J1753.5-0127 270.2411 -24.8902 9.4 16.0 -166.1 -0.1202 -1.2 11.6 GX 5-1 270.2236 -25.8747 3.5 15.2 -163.6 0.3186 3.3 9.0 GRS 1758-258 273.8934 -13.9545 11.6 26.9 -175.8 -0.1043 -1.0 8.2 GX 17+2 275.9302 -30.3618 26.0 16.7 -139.5 0.0447 0.4 0.4 H1820-303 284.9180 -24.8853 6.7 26.3 -141.8 -0.1839 -1.7 6.8 HT1900.1-2455 288.8359 10.9677 5.9 55.9 -175.3 -0.7418 -2.0 2.6 GRS 1915+105 262.8637 -33.8117 17.0 5.2 -151.6 0.0662 0.7 6.4 GX 354-0 275.8343 -0.1616 2.7 40.1 176.0 0.7046 4.4 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image: -2.956000 15.276580 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 186.6901 -62.8681 7.4 49.5 0.9 0.2627 1.6 5.9 GX 301-2 244.9586 -15.6917 6.5 23.4 115.2 -0.1612 -1.8 3.3 Sco X-1 255.9725 -37.8600 23.8 1.8 1.8 0.0344 0.5 1.2 4U 1700-377 256.4905 -36.6190 1312.5 0.7 37.1 0.0006 0.0 12.1 GX 349+2 263.1225 -24.6726 7.6 12.7 171.1 -0.1070 -1.5 7.6 GX 1+4 264.8347 -44.5522 3.3 10.0 -66.3 0.2392 3.4 7.3 4U 1735-44 268.4293 -1.5835 7.4 36.3 165.4 -0.1668 -1.6 8.7 SW J1753.5-0127 270.2930 -24.9146 5.1 16.0 -165.9 0.1614 2.3 9.9 GX 5-1 270.3474 -25.8745 6.2 15.3 -163.3 -0.1367 -1.9 8.2 GRS 1758-258 274.0602 -14.0905 5.6 26.9 -175.4 -0.1541 -2.1 4.5 GX 17+2 276.0156 -30.5644 0.0 16.6 -138.7 -0.0303 -0.4 12.7 H1820-303 284.9827 -24.8504 10.5 26.3 -141.8 0.0876 1.1 5.1 HT1900.1-2455 288.8452 10.9424 7.6 55.9 -175.3 0.4369 1.5 2.8 GRS 1915+105 263.1831 -33.8550 5.5 5.4 -149.7 0.1420 2.1 9.7 GX 354-0 269.6040 -40.3464 0.4 10.4 -97.6 2.0134 29.5 ------ UNKNOWN 299.8124 -40.5729 2.2 33.2 -103.2 0.5891 5.1 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image: 60.476590 860.476600 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 186.6471 -62.6680 5.6 51.8 19.2 6.8195 2.1 6.1 GX 301-2 244.9839 -15.6287 0.8 32.7 115.8 40.4711 13.9 0.7 Sco X-1 256.0678 -37.7618 104.9 10.8 83.3 0.1509 0.1 6.3 4U 1700-377 256.2041 -36.4698 8.5 11.2 89.8 1.8623 1.4 11.5 GX 349+2 263.0257 -24.5948 3.8 16.7 142.5 3.8345 3.0 9.1 GX 1+4 264.6813 -44.5934 4.3 5.6 22.9 3.1366 2.7 9.0 4U 1735-44 268.4509 -1.5714 5.8 38.8 161.9 4.7963 2.0 8.7 SW J1753.5-0127 270.0991 -25.1350 5.7 15.2 165.4 2.4930 2.0 10.6 GX 5-1 270.1414 -25.8583 10.7 14.5 165.7 1.3328 1.1 11.1 GRS 1758-258 273.9466 -14.1767 8.7 26.5 173.2 1.6902 1.3 9.1 GX 17+2 275.9270 -30.2137 4.3 11.4 -167.4 3.0522 2.7 9.2 H1820-303 285.2093 -24.7961 0.0 20.3 -151.5 2.2200 1.8 12.0 HT1900.1-2455 288.8677 11.0253 4.2 54.4 -172.8 11.4815 2.8 6.3 GRS 1915+105 263.1430 -33.9200 3.2 8.2 123.1 4.4318 3.6 9.2 GX 354-0 257.6201 -2.4529 3.0 39.4 144.7 13.7202 3.9 ------ UNKNOWN 268.9203 5.3952 4.5 45.8 162.8 10.8043 2.6 ------ UNKNOWN