GRB 100216A
GCN Circular 10428
Subject
GRB 100216A Short, hard GRB detected in ground analysis of Swift-BAT data
Date
2010-02-19T00:32:34Z (15 years ago)
From
Jay R. Cummings at NASA/GSFC/Swift <jayc@milkyway.gsfc.nasa.gov>
J. R. Cummings (NASA/GSFC/CRESST), S. D. Barthelmy (GSFC), D. B. Fox (PSU),
N. Gehrels (GSFC), H. A. Krimm (GSFC/USRA), and D. M. Palmer (LANL)
report on behalf of the Swift team:
At 10:07:00 UT, Swift-BAT detected GRB 100216A as a rate peak (trigger#
412522), but no source was found onboard. A source was detected in
ground analysis at RA, Dec 154.263, +35.524, which is
RA (J2000) 10h 17m 03.2s
Dec (J2000) +35d 31' 27.5"
with an estimated 90% containment of 3 arcmin. The source was detected
at a significance of 6.8 sigma in the ground analysis. This level
ordinarily indicates a real source, but may have been reached by chance
a few times in the past in similar BAT images. The maskweighted and raw
lightcurves, however, do appear to be consistent with this location being
the source of the burst. This position was 41% coded in BAT. This burst
was also detected by Fermi GBM (trigger 288007622) at a best ground-
analysis position of RA, Dec: 166.9, 56.6 with an estimated uncertainty
of 6.6 degrees (Gruber, private communication). The entire GBM error
circle was in a highly-coded region of the BAT FOV, and no credible peak
was found any closer to the GBM position.
The burst as seen by BAT consisted of a single peak lasting 0.3 seconds.
The power-law index of the spectrum was 0.6 +/- 0.3. The fluence in the
interval 15-350 keV was (4.7 +- 3) x 10^-8 erg/cm2.
There was no automated followup because the source was not detected
onboard. The detailed data on the burst was not available until two days
after the burst. We note that there is a bright (g'=17.2 mag),
DSS-resolved galaxy, KUG 1014+357 (aka LEDA 86918, aka
SDSS J101700.25+353118.9) at redshift z = 0.038, within the BAT
localization region. Given the possibility of a low-redshift origin for
this event, and although detectable X-ray emission from short bursts
rarely lasts so long, a limited Swift TOO campaign has been requested
and approved.
GCN Circular 10429
Subject
GRB 100216A: Keck imaging
Date
2010-02-19T11:57:11Z (15 years ago)
From
Daniel Perley at U.C. Berkeley <dperley@astro.berkeley.edu>
D. A. Perley (UC Berkeley), J. Meyers, E. Hsiao, N. Suzuki, P. Nugent,
S. Perlmutter (LBNL), S. B. Cenko, and J. S. Bloom (UCB) report:
We acquired imaging of the field of short-hard burst GRB 100216A
(Cummings et al., GCN 10428) on 2010-02-19 starting at 07:31 UT, using
LRIS on Keck 1. A total of 660 seconds of imaging was acquired in
R-band and 900 seconds in g-band simultaneously. The imaging covers
approximately 90% of the BAT error circle including the nearby galaxy
mentioned in GCN 10428, a barred spiral at z=0.0378. In a preliminary
reduction of the R-band frames we identify no new source within the
field, down to the SDSS limit of approximately R>22 mag.
GCN Circular 10435
Subject
GRB 100216A: XRT Refined Analysis
Date
2010-02-19T23:51:55Z (15 years ago)
From
Antonia Rowlinson at U.of Leicester <bar7@star.le.ac.uk>
A. Rowlinson (U. Leicester), K. Page (U. Leicester) and N. Lyons (U.
Leicester) report on behalf of the Swift-XRT team:
We have analysed 9.9 ks of XRT data for GRB 100216A (Cummings et al. GCN
Circ. 10428), from 214.4 ks to 249.2 ks after the BAT trigger. The data
are entirely in Photon Counting (PC) mode.
We do not detect any fading source within the BAT refined error circle
of Cummings et al. (GCN Circ. 10428). A source is detected within the
BAT refined error circle at RA, Dec = 154.25836, +35.56772 which is
equivalent to:
RA (J2000): 10h 17m 2.0s
Dec (J2000): +35d 34' 3.8''
with an uncertainty of 5 arcsec (radius, 90% confidence) and is likely
to be the known X-ray source 1RXS J101702.9+353404. This source has a
count rate of 0.004 count s^-1, corresponding to a flux of 2.6e-13 erg
cm^-2 s^-1, however fading cannot be determined at this time and futher
observations are being planned.
The three sigma upper limit 0.3 - 10 keV count rate for a source at any
other position within the BAT error circle is 6e-4 count s^-1, which
corresponds to an observed flux limit of 2.3e-14 erg cm^-2 s^-1
(assuming a typical count-to-observed flux conversion factor of 3.8e-11
erg cm^-2 ct^-1, Evans et al., 2009, MNRAS, 397, 1177).
The results of the XRT-team automatic analysis are available at
http://www.swift.acc.uk/xrt_products/00020127.
This circular is an official product of the Swift-XRT team.
GCN Circular 10442
Subject
GRB 100216A: Swift/UVOT Observations
Date
2010-02-20T05:01:15Z (15 years ago)
From
Mike Siegel at PSU/Swift MOC <siegel@astro.psu.edu>
M. H. Siegel (PSU) and A. Rowlinson (U. Leicester) report on behalf of
the SWIFT-UVOT team:
We have analysed 9787 ks of UVOT data for GRB 100216A (Cummings et al.,
GCN Circ. 10428), from 214.4 ks to 249.2 ks after the BAT trigger. The
data are entirely in the UVW2 filter.
We identify a source within the error circle of the XRT position given
by Rowlinson et al. (GCN Circ. 10435) with a UVW2 magnitude of 17.59
+- .03 and a position of 154.25872, +35.56806, which is equivalent to:
RA(J2000) = 10h 17m 02.09s
Dec(J2000) = +35d 34m 05.0"
with a 90% confidence interval of 0.6 arc sec. However, this source is
also seen in the Digital Sky Survey and exhibits no fading or measurable
variability over the 35 ks of observations. It is likely the
ultraviolet counterpart to the known X-ray source 1RXS
J01702.9+353404 identified by Rowlinson et al. We show no other
bright source near the XRT position to a 3-sigma upper limit of
UVW2=22.2.
The quoted magnitudes have not been corrected for the expected
Galactic extinction along the line of sight corresponding to a
reddening of E_{B-V} = 0.10 mag (Schlegel, et al., 1998, ApJS, 500,
525). All photometry is on the UVOT photometric system described in
Poole et al. (2008, MNRAS, 383, 627).