Gamma-ray Burst 090107

(All information courtesy of the instrument teams.)

Previous IAU Circulars

none

Results of Observations

GCN/BACODINE POSITION NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Wed 07 Jan 09 04:48:18 UT
NOTICE_TYPE:     Swift-BAT GRB Position
TRIGGER_NUM:     339295,   Seg_Num: 0
GRB_RA:          302.426d {+20h 09m 42s} (J2000),
                 302.538d {+20h 10m 09s} (current),
                 301.804d {+20h 07m 13s} (1950)
GRB_DEC:          +4.727d {+04d 43' 39"} (J2000),
                  +4.754d {+04d 45' 16"} (current),
                  +4.579d {+04d 34' 46"} (1950)
GRB_ERROR:       3.00 [arcmin radius, statistical only]
GRB_INTEN:       5225 [cnts]    Image_Peak=238 [image_cnts]
TRIGGER_DUR:     1.024 [sec] 
TRIGGER_INDEX:   146     E_range: 25-100 keV
BKG_INTEN:       32956 [cnts]
BKG_TIME:        17267.60 SOD {04:47:47.60} UT
BKG_DUR:         8 [sec]
GRB_DATE:        14838 TJD;     7 DOY;   09/01/07
GRB_TIME:        17284.30 SOD {04:48:04.30} UT
GRB_PHI:         -63.72 [deg]
GRB_THETA:        22.49 [deg]
SOLN_STATUS:     0x3
RATE_SIGNIF:     14.52 [sigma]
IMAGE_SIGNIF:    8.58 [sigma]
MERIT_PARAMS:     +1  +0  +0  +0  +2  +3 -100  +0 -86  +0 
SUN_POSTN:       288.45d {+19h 13m 47s}  -22.35d {-22d 21' 15"}
SUN_DIST:         30.41 [deg]   Sun_angle= -0.9 [hr] (East of Sun)
MOON_POSTN:       48.21d {+03h 12m 50s}  +23.18d {+23d 10' 33"}
MOON_DIST:       102.41 [deg]
MOON_ILLUM:      79 [%]
GAL_COORDS:       46.44,-15.04 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      305.87, 24.22 [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 = 146.49,20.27 [deg].

red DSS finding chart ps-file

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Wed 07 Jan 09 04:51:31 UT
NOTICE_TYPE:     Swift-BAT GRB Lightcurve
TRIGGER_NUM:     339295,   Seg_Num: 0
GRB_RA:          302.426d {+20h 09m 42s} (J2000),
                 302.538d {+20h 10m 09s} (current),
                 301.804d {+20h 07m 13s} (1950)
GRB_DEC:          +4.727d {+04d 43' 39"} (J2000),
                  +4.754d {+04d 45' 16"} (current),
                  +4.579d {+04d 34' 46"} (1950)
GRB_DATE:        14838 TJD;     7 DOY;   09/01/07
GRB_TIME:        17284.30 SOD {04:48:04.30} UT
TRIGGER_INDEX:   146
GRB_PHI:         -63.72 [deg]
GRB_THETA:        22.49 [deg]
DELTA_TIME:      -69.00 [sec]
TRIGGER_DUR:     1.024 [sec] 
SOLN_STATUS:     0x3
RATE_SIGNIF:     14.52 [sigma]
IMAGE_SIGNIF:    8.58 [sigma]
LC_URL:          sw00339295000msb.lc
SUN_POSTN:       288.45d {+19h 13m 48s}  -22.35d {-22d 21' 14"}
SUN_DIST:         30.41 [deg]   Sun_angle= -0.9 [hr] (East of Sun)
MOON_POSTN:       48.24d {+03h 12m 59s}  +23.18d {+23d 11' 01"}
MOON_DIST:       102.44 [deg]
MOON_ILLUM:      79 [%]
GAL_COORDS:       46.44,-15.04 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      305.87, 24.22 [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 = 146.49,20.27 [deg].

GCN Circular #8782
T. N. Ukwatta (GSFC/GWU), J. R. Cummings (NASA/UMBC), N. Gehrels (NASA/GSFC), C. Guidorzi (U Ferrara), S. T. Holland (CRESST/USRA/GSFC), J. A. Kennea (PSU), W.B Landsman (GSFC), D. M. Palmer (LANL), M. Perri (ASDC) and G. Stratta (ASDC) report on behalf of the Swift Team:
At 04:48:04 UT, the Swift Burst Alert Telescope (BAT) triggered and located GRB 090107 (trigger=339295). Swift could not slew to this burst due to its proximity to the Sun. The BAT on-board calculated location is RA, Dec 302.426, +4.727 which is
```
   RA(J2000) = 20h 09m 42s
   Dec(J2000) = +04d 43' 39"
```
with an uncertainty of 3 arcmin (radius, 90% containment, including systematic uncertainty). The BAT light curve showed a double-peaked structure with a duration of about 25 sec, with a possible additional peak at T+75 sec. The peak count rate was ~2000 counts/sec (15-350 keV), at ~0 sec after the trigger.
Due to the Sun observing constraint, Swift cannot slew to the BAT position. There will thus be no XRT or UVOT data for this trigger.
Burst Advocate for this burst is T. N. Ukwatta (tilan.ukwatta AT gmail.com). 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 #8783
G. Sato (ISAS), S. D. Barthelmy (GSFC), W. H. Baumgartner (GSFC/UMBC), J. R. Cummings (GSFC/UMBC), E. E. Fenimore (LANL), N. Gehrels (GSFC), H. A. Krimm (GSFC/USRA), C. B. Markwardt (GSFC/UMD), D. M. Palmer (LANL), T. Sakamoto (GSFC/UMBC), M. Stamatikos (GSFC/ORAU), J. Tueller (GSFC), T. N. Ukwatta (GWU) (i.e. the Swift-BAT team):
Using the data set from T-240 to T+962 sec from recent telemetry downlinks, we report further analysis of BAT GRB 090107 (trigger #339295) (Ukwatta, et al., GCN Circ. 8782). The BAT ground-calculated position is RA, Dec = 302.409, 4.744 deg, which is
```
   RA(J2000)  =  20h 09m 38.2s 
   Dec(J2000) = +04d 44' 37.9" 
```
with an uncertainty of 2.4 arcmin, (radius, sys+stat, 90% containment). The partial coding was 74%.
The mask-weighted light curve shows two peaks. The first is about 1.2 sec wide and peaks at ~T+0.9 sec. The second is about 6 sec wide and peaks at ~T+11 sec. Because of the Sun observing constraint and because of a regular pre-planned target slew, the BAT has no data on this event past T+260 sec, until the next orbit. T90 (15-350 keV) is 12.2 +- 0.7 sec (estimated error including systematics).
The time-averaged spectrum from T+0.2 to T+12.9 sec is best fit by a simple power-law model. The power law index of the time-averaged spectrum is 1.69 +- 0.27. The fluence in the 15-150 keV band is 2.3 +- 0.5 x 10^-7 erg/cm2. The 1-sec peak photon flux measured from T+0.30 sec in the 15-150 keV band is 1.1 +- 0.2 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/339295/BA/
GCN Report 191.1
GCN_Report 191.1 has been posted: http://gcn.gsfc.nasa.gov/reports/report_191_1.pdf by T. Ukwatta at GSFC/GWU titled: "Final Swift Observations of GRB 090107A"
1102.3206 from 17 Feb 11
A. G. Vieregg et al.: The First Limits on the Ultra-high Energy Neutrino Fluence from Gamma-ray Bursts
We set the first limits on the ultra-high energy (UHE) neutrino fluence at energies greater than 10^9 GeV from gamma-ray bursts (GRBs) based on data from the second flight of the ANtarctic Impulsive Transient Antenna (ANITA). During the 31 day flight of ANITA-II, 26 GRBs were recorded by Swift or Fermi. Of these, we analyzed the 12 GRBs which occurred during quiet periods when the payload was away from anthropogenic activity. In a blind analysis, we observe 0 events on a total background of 0.0044 events in the combined prompt window for all 12 low-background bursts. We also observe 0 events from the remaining 14 bursts. We place a 90% confidence level limit on the E^-4 prompt neutrino fluence of 2.5x10^17 GeV^3/cm^2 between 10^8 and 10^12 GeV from GRB090107A. This is the first reported limit on the UHE neutrino fluence from GRBs above 10^9 GeV, and the strongest limit above 10^8 GeV.

Back to JG's homepage

Jochen Greiner, last update: 17-Feb-2011 [Disclaimer]