Gamma-ray Burst 140118A

(All information courtesy of the instrument teams.)

Previous IAU Circulars

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Results of Observations

GCN/BACODINE POSITION NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Sat 18 Jan 14 01:32:45 UT
NOTICE_TYPE:     Swift-BAT GRB Position
TRIGGER_NUM:     584136,   Seg_Num: 0
GRB_RA:          331.003d {+22h 04m 01s} (J2000),
                 331.195d {+22h 04m 47s} (current),
                 330.318d {+22h 01m 16s} (1950)
GRB_DEC:         -17.948d {-17d 56' 50"} (J2000),
                 -17.879d {-17d 52' 44"} (current),
                 -18.190d {-18d 11' 24"} (1950)
GRB_ERROR:       3.00 [arcmin radius, statistical only]
GRB_INTEN:       14076 [cnts]    Image_Peak=384 [image_cnts]
TRIGGER_DUR:     4.096 [sec] 
TRIGGER_INDEX:   291     E_range: 15-50 keV
BKG_INTEN:       122027 [cnts]
BKG_TIME:        5468.46 SOD {01:31:08.46} UT
BKG_DUR:         40 [sec]
GRB_DATE:        16675 TJD;    18 DOY;   14/01/18
GRB_TIME:        5522.73 SOD {01:32:02.73} UT
GRB_PHI:         -127.08 [deg]
GRB_THETA:        36.29 [deg]
SOLN_STATUS:     0x20000003
RATE_SIGNIF:     13.26 [sigma]
IMAGE_SIGNIF:    10.36 [sigma]
MERIT_PARAMS:     +1  +0  +0  +2  +1  +0 -100  +0 -87  +0 
SUN_POSTN:       299.95d {+19h 59m 49s}  -20.59d {-20d 35' 09"}
SUN_DIST:         29.58 [deg]   Sun_angle= -2.1 [hr] (East of Sun)
MOON_POSTN:      139.08d {+09h 16m 20s}  +10.80d {+10d 47' 53"}
MOON_DIST:       166.30 [deg]
MOON_ILLUM:      97 [%]
GAL_COORDS:       37.33,-50.46 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      326.74, -5.70 [deg] ecliptic lon,lat of the burst (or transient)
COMMENTS:        SWIFT-BAT GRB Coordinates.  
COMMENTS:        This is a rate trigger.  
COMMENTS:        A point_source was found.  
COMMENTS:        This does not match any source in the on-board catalog.  
COMMENTS:        This does not match any source in the ground catalog.  
COMMENTS:        This is a GRB.  
COMMENTS:        This trigger occurred at longitude,latitude = 200.07,6.22 [deg].  
COMMENTS:           
COMMENTS:        NOTE: This BAT event is temporally(5.0<100sec) coincident with the FERMI_GBM event (trignum=411701530).

red DSS finding chart ps-file

GCN NOTICE

TITLE:           GCN/FERMI NOTICE
NOTICE_DATE:     Sat 18 Jan 14 01:32:32 UT
NOTICE_TYPE:     Fermi-GBM Flight Position
RECORD_NUM:      44
TRIGGER_NUM:     411701530
GRB_RA:          330.050d {+22h 00m 12s} (J2000),
                 330.229d {+22h 00m 55s} (current),
                 329.414d {+21h 57m 39s} (1950)
GRB_DEC:          +2.117d {+02d 07' 00"} (J2000),
                  +2.185d {+02d 11' 04"} (current),
                  +1.876d {+01d 52' 34"} (1950)
GRB_ERROR:       34.88 [deg radius, statistical plus systematic]
GRB_INTEN:       46 [cnts/sec]
DATA_SIGNIF:     4.60 [sigma]
INTEG_TIME:      4.096 [sec]
GRB_DATE:        16675 TJD;    18 DOY;   14/01/18
GRB_TIME:        5527.85 SOD {01:32:07.85} UT
GRB_PHI:          36.00 [deg]
GRB_THETA:        80.00 [deg]
DATA_TIME_SCALE: 4.0960 [sec]
HARD_RATIO:      1.65
LOC_ALGORITHM:   3 (version number of)
MOST_LIKELY:      44%  Solar Flare
2nd_MOST_LIKELY:  44%  GRB
DETECTORS:       0,1,0, 0,0,1, 0,0,0, 0,0,0, 0,0,
SUN_POSTN:       299.95d {+19h 59m 49s}  -20.59d {-20d 35' 09"}
SUN_DIST:         37.39 [deg]   Sun_angle= -2.0 [hr] (East of Sun)
MOON_POSTN:      139.08d {+09h 16m 19s}  +10.80d {+10d 47' 55"}
MOON_DIST:       162.92 [deg]
MOON_ILLUM:      97 [%]
GAL_COORDS:       61.33,-39.47 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      332.90, 13.43 [deg] ecliptic lon,lat of the burst (or transient)
COMMENTS:        Fermi-GBM Flight-calculated Coordinates.  
COMMENTS:        This trigger occurred at longitude,latitude = 117.43,23.90 [deg].

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Sat 18 Jan 14 01:35:47 UT
NOTICE_TYPE:     Swift-BAT GRB Lightcurve
TRIGGER_NUM:     584136,   Seg_Num: 0
GRB_RA:          331.003d {+22h 04m 01s} (J2000),
                 331.195d {+22h 04m 47s} (current),
                 330.318d {+22h 01m 16s} (1950)
GRB_DEC:         -17.948d {-17d 56' 50"} (J2000),
                 -17.879d {-17d 52' 44"} (current),
                 -18.190d {-18d 11' 24"} (1950)
GRB_DATE:        16675 TJD;    18 DOY;   14/01/18
GRB_TIME:        5522.73 SOD {01:32:02.73} UT
TRIGGER_INDEX:   291
GRB_PHI:         -127.08 [deg]
GRB_THETA:        36.29 [deg]
DELTA_TIME:      12.00 [sec]
TRIGGER_DUR:     4.096 [sec] 
SOLN_STATUS:     0x3
RATE_SIGNIF:     13.26 [sigma]
IMAGE_SIGNIF:    10.36 [sigma]
LC_URL:          sw00584136000msb.lc
SUN_POSTN:       299.96d {+19h 59m 50s}  -20.59d {-20d 35' 07"}
SUN_DIST:         29.57 [deg]   Sun_angle= -2.1 [hr] (East of Sun)
MOON_POSTN:      139.11d {+09h 16m 26s}  +10.79d {+10d 47' 28"}
MOON_DIST:       166.32 [deg]
MOON_ILLUM:      97 [%]
GAL_COORDS:       37.33,-50.46 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      326.74, -5.70 [deg] ecliptic lon,lat of the burst (or transient)
COMMENTS:        SWIFT-BAT GRB Lightcurve.  
COMMENTS:           
COMMENTS:        The next comments were copied from the BAT_POS Notice:  
COMMENTS:        This is a rate trigger.  
COMMENTS:        A point_source was found.  
COMMENTS:        This does not match any source in the on-board catalog.  
COMMENTS:        This does not match any source in the ground catalog.  
COMMENTS:        This is a GRB.  
COMMENTS:        This trigger occurred at longitude,latitude = 200.07,6.22 [deg].

GCN Circular #15748
H. A. Krimm (CRESST/GSFC/USRA), S. D. Barthelmy (GSFC), W. H. Baumgartner (GSFC/UMBC), J. A. Kennea (PSU), V. Mangano (PSU), C. B. Markwardt (NASA/GSFC), C. Pagani (U Leicester), K. L. Page (U Leicester), D. M. Palmer (LANL), M. H. Siegel (PSU) and T. N. Ukwatta (MSU) report on behalf of the Swift Team:
At 01:32:02 UT, the Swift Burst Alert Telescope (BAT) triggered and located GRB 140118A (trigger=584136). Swift did not slew to the burst because the location is sun-constrained. The BAT on-board calculated location is RA, Dec 331.003, -17.948 which is
```
   RA(J2000) = 22h 04m 01s
   Dec(J2000) = -17d 56' 50"
```
with an uncertainty of 3 arcmin (radius, 90% containment, including systematic uncertainty). The BAT light curve showed a broad triangle- shaped peak structure with a duration of about 40 sec. The peak count rate was ~1200 counts/sec (15-350 keV), at ~3 sec after the trigger.
Due to a Sun observing constraint, Swift cannot slew to the BAT position until 07:34 UT on 2014 April 03. There will thus be no XRT or UVOT data for this trigger before this time.
Burst Advocate for this burst is H. A. Krimm (hans.krimm AT nasa.gov). Please contact the BA by email if you require additional information regarding Swift followup of this burst. In extremely urgent cases, after trying the Burst Advocate, you can contact the Swift PI by phone (see Swift TOO web site for information: http://www.swift.psu.edu/too.html.)
GCN Circular #15750
A. Y. Lien (NASA/UMBC), S. D. Barthelmy (GSFC), W. H. Baumgartner (GSFC/UMBC), J. R. Cummings (GSFC/UMBC), N. Gehrels (GSFC), H. A. Krimm (GSFC/USRA), C. B. Markwardt (GSFC), D. M. Palmer (LANL), T. Sakamoto (AGU), M. Stamatikos (OSU), J. Tueller (GSFC), T. N. Ukwatta (MSU) (i.e. the Swift-BAT team):
Using the data set from T-239 to T+963 sec from the recent telemetry downlink, we report further analysis of BAT GRB 140118A (trigger #584136) (Krimm, et al., GCN Circ. 15748). The BAT ground-calculated position is RA, Dec = 330.999, -17.937 deg which is
```
    RA(J2000)  =  22h 03m 59.8s
    Dec(J2000) = -17d 56' 14.1"
```
with an uncertainty of 1.5 arcmin, (radius, sys+stat, 90% containment). The partial coding was 41%. The mask-weighted light curve shows a double-peaked structure of two triangular shaped peaks. The first runs from T-70 to T-20 and the second, stronger peak from T-20 to T+30. T90 (15-350 keV) is 84.15 +- 10.79 sec (estimated error including systematics).
The time-averaged spectrum from T-73.61 to T+30.87 sec is best fit by a simple power-law model. The power law index of the time-averaged spectrum is 1.87 +- 0.13. The fluence in the 15-150 keV band is 2.6 +- 0.2 x 10^-6 erg/cm2. The 1-sec peak photon flux measured from T+2.98 sec in the 15-150 keV band is 1.9 +- 0.3 ph/cm2/sec. All the quoted errors are at the 90% confidence level.
The results of the batgrbproduct analysis are available at http://gcn.gsfc.nasa.gov/notices_s/584136/BA/
GCN Circular #15751
Shaolin Xiong (UAH) reports on behalf of the Fermi GBM Team:
"At 01:32:07.85 UT on 18 January 2014, the Fermi Gamma-Ray Burst Monitor triggered and located GRB 140118A (trigger 411701530 / 140118064), which was also detected by the Swift/BAT (Krimm et al., GCN 15748; Lien et al., GCN 15750). The GBM on-ground location is consistent with the Swift position. The angle from the Fermi LAT boresight is 90 degrees.
The GBM light curve consists of two separate pulses with a duration (T90) of about 92 s (50-300 keV). The time-averaged spectrum from T0-74 s to T0+23 s is adequately fit by a simple power law function with index -1.89 +/- 0.05.
The event fluence (10-1000 keV) in this time interval is (6.0 +/- 0.4)E-6 erg/cm^2. The 1-sec peak photon flux measured starting from T0-2.05 s in the 10-1000 keV band is 2.5 +/- 0.2 ph/s/cm^2.
The spectral analysis results presented above are preliminary; final results will be published in the GBM GRB Catalog."
GCN Circular #15752
Nat Butler (ASU), Alan M. Watson (UNAM), Alexander Kutyrev (GSFC), William H. Lee (UNAM), Michael G. Richer (UNAM), Chris Klein (UCB), Ori Fox (UCB), J. Xavier Prochaska (UCSC), Josh Bloom (UCB), Antonino Cucchiara (ORAU/GSFC), Eleonora Troja (GSFC), Owen Littlejohns (ASU), Enrico Ramirez-Ruiz (UCSC), Jos=E9 A. de Diego (UNAM), Leonid Georgiev (UNAM), Jes=FAs Gonz=E1lez (UNAM), Carlos Rom=E1n-Z=FA=F1iga (UNAM), Neil Gehrels (GSFC), and Harvey Moseley (GSFC) report:
We observed the field of GRB 140118A (Krimm, et al., GCN 15748) with the Reionization and Transients Infrared Camera (RATIR; www.ratir.org) on the 1.5m Harold Johnson Telescope at the Observatorio Astron=F3mico Nacional on Sierra San Pedro M=E1rtir from 2014/01 18.09 to 2014/01 18.10 UTC (39.6 to 53.4 minute after the BAT trigger), obtaining a total of 7.8 minutes exposure in the r and i bands and 4.2 minutes exposure in the Z, Y, and J bands through high airmass.
We detect no new, uncatalogued sources in the refined Swift BAT error box (Lien et al., GCN 15750). In comparison with 2MASS, we obtain the following 3-sigma upper limits:
```
  r     > 19.93
  i     > 19.37
  Z     > 19.06
  Y     > 18.99
  J     > 18.32
```
These magnitudes are in the AB system and are not corrected for Galactic extinction in the direction of the GRB.
We thank the staff of the Observatorio Astron=F3mico Nacional in San Pedro M=E1rtir.

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Jochen Greiner, last update: 18-Jan-2014 [Disclaimer]