GRB 051114
GCN Circular 4272
Subject
GRB 051114: Swift-BAT detection of a short burst
Date
2005-11-15T03:26:12Z (20 years ago)
From
Jay R. Cummings at NASA/GSFC/Swift <jayc@milkyway.gsfc.nasa.gov>
J. Cummings (GSFC/NRC), S. Barthelmy (GSFC), N. Gehrels (GSFC),
D. Palmer (LANL)
on behalf of the Swift-BAT team:
At 04:11:30 UT, Swift-BAT triggered and located GRB 051114 (trigger=163844).
The on-board software did not locate this burst with sufficient significance,
however ground processing was able to extract a location. The BAT ground
calculated location is RA,Dec 226.274d,+60.150d {15h 05m 06s,+60d 09' 00"}
(J2000), with an uncertainty of 3 arcmin (radius, 90% containment, stat+sys).
The BAT light curve shows two short peaks separated by ~1 sec with a total
duration of 2 sec. The peak count rate was ~1500 counts/sec (15-350 keV),
at ~0.5 seconds after the trigger.
We note that due a handling mistake on the ground, the GCN BAT_POSITION Notice
was generated with incorrect values in the following fields: TRIGGER_NUM,
GRB_INTEN, BKG_INTEN, BKG_TIME, BKG_DUR, GRB_TIME, MERIT_PARAMS. All the
other numbers in the Notice are correct (including the Sun & Moon locations
and the Galactic and Ecliptic coordinates).
GCN Circular 4275
Subject
GRB 051114: Swift-BAT refined analysis
Date
2005-11-15T23:01:54Z (20 years ago)
From
Jay R. Cummings at NASA/GSFC/Swift <jayc@milkyway.gsfc.nasa.gov>
T. Sakamoto (GSFC/NRC), L. Barbier (GSFC), S. Barthelmy (GSFC),
J. Cummings (GSFC/NRC), E. Fenimore (LANL), N. Gehrels (GSFC),
D. Hullinger (UMD), H. Krimm (GSFC/USRA), C. Markwardt (GSFC/UMD),
F. Marshall (GSFC), D. Palmer (LANL), A. Parsons (GSFC),
G. Sato (ISAS), A. Smale (NASA HQ), J. Tueller (GSFC),
on behalf of the Swift-BAT team:
Using the full data set from T-4 to T+16 sec (all the data we will
get on this ground-detected burst), we report further analysis
of BAT GRB 051114 (trigger #163844) (Cummings, et al., GCN 4272).
The BAT ground-calculated position is (RA,Dec) = 226.266d,+60.156d
{15h 05m 04s,60d 09' 22"} [deg; J2000] +- 2 arcmin, (radius,
sys+stat, 90% containment). The partial coding was 78%.
The light curve shows two peaks of roughly equal intensity, the
second slightly softer, one from T+0.2 to T+0.9 sec and one from
T+1.3 to T+2.7 sec. T90 (15-350 keV) is (2.2 +- 0.3) sec (estimated
error including systematics).
The power law index of the time-averaged spectrum is 1.22 +- 0.27.
The fluence in the 15-150 keV band is (1.32 +- 0.24) x 10^-7 erg/cm2.
The 1-sec peak photon flux measured from T+0.2 sec in the 15-150 keV
band is (0.73 +- 0.16) ph/cm2/sec. All the quoted errors are at the
90% confidence level.
GCN Circular 4276
Subject
GRB 051114: Radio Observations
Date
2005-11-15T23:55:17Z (20 years ago)
From
Dale A. Frail at NRAO <dfrail@nrao.edu>
Dale A. Frail (NRAO) reports on behalf of a larger collaboration:
"We observed the field of the burst GRB 051114 (GCN 4272; GCN 4275)
with the Very Large Array at 8.5 GHz around November 15.58 UT. Within
the 2-arcmin radius of the BAT position (GCN 4275) we find no radio
emission above 4-sigma, for an rms noise of 50 microJy.
The National Radio Astronomy Observatory is a facility of the National
Science Foundation operated under cooperative agreement by Associated
Universities, Inc."
GCN Circular 4279
Subject
GRB051114: results of the Swift-XRT observation
Date
2005-11-16T17:42:30Z (20 years ago)
From
Giancarlo Cusumano at IASF/CNR Palermo/BeppoSAX,SWIFT <cusumano@pa.iasf.cnr.it>
V. Mangano, G. Cusumano, V. La Parola, T. Mineo
(INAF-IASFPA), D. Burrows, J. Kennea (PSU), L. Cominsky
(Sonoma State U.) and J. Norris (GSFC)
on behalf of the Swift-XRT team:
The Swift-XRT started a 13.6 ks ToO observation of the
field of GRB051114 (Cummings at al., GCN 4272) on
November 15 at 15:18:23 UT, 35 hours after the burst
trigger.
No new source was detected within the BAT refined error
circle (Sakamoto at al., GCN 4275) down to a limiting flux
of 2.3e-14 ergs/cm/cm/s.