GRB 140209A
GCN Circular 15808
Subject
GRB 140209A: Swift detection of a burst
Date
2014-02-09T07:45:23Z (11 years ago)
From
David Palmer at LANL <palmer@lanl.gov>
S. B. Cenko (GSFC), W. H. Baumgartner (GSFC/UMBC), V. D'Elia (ASDC),
L. Izzo (URoma/ICRA), H. A. Krimm (CRESST/GSFC/USRA),
A. Y. Lien (NASA/GSFC/ORAU), D. M. Palmer (LANL) and
E. Sonbas (NASA/GSFC/Adiyaman Univ.) report on behalf of the Swift
Team:
At 07:30:57 UT, the Swift Burst Alert Telescope (BAT) triggered and
located GRB 140209A (trigger=586071). The BAT on-board calculated location is
RA, Dec 81.335, +32.477 which is
RA(J2000) = 05h 25m 20s
Dec(J2000) = +32d 28' 37"
with an uncertainty of 3 arcmin (radius, 90% containment, including
systematic uncertainty). The BAT light curve showed a multi-peaked
structure with a duration of about 5 sec. The peak count rate
was ~43000 counts/sec (15-350 keV), at ~2 sec after the trigger.
Due to a Moon observing constraint, Swift cannot slew to the BAT
position until 04:37 UT on 2014 February 11. There will thus be no XRT
or UVOT data for this trigger before this time.
Burst Advocate for this burst is S. B. Cenko (brad.cenko 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 15809
Subject
GRB 140209A: P60 optical afterglow detection
Date
2014-02-09T09:29:44Z (11 years ago)
From
Daniel Perley at Caltech <dperley@astro.caltech.edu>
D. A. Perley (Caltech) reports on behalf of a larger collaboration:
The Palomar 60-inch telescope responded automatically to the Swift alert
for GRB 140209A (Cenko et al., GCN 15808) and began a sequence of
60-second exposures in r, i, and z filters at 07:35:30 UT, 4.55 minutes
after the BAT trigger. In the reduced images, we clearly detect a
fading, uncatalogued optical counterpart inside the BAT error circle at
the following location:
RA = 05:25:19.034
Dec = +32:29:53.18
(+/- 0.6 arcsec)
Calibrated relative to USNO-B1.0, the source fades steadily from R=17.6
in the first r-band image to R=19.4 at 41.1 minutes post-GRB, which
identifies it as the likely optical afterglow of this event.
GCN Circular 15810
Subject
GRB 140209A: optical observations
Date
2014-02-09T10:37:54Z (11 years ago)
From
Alexei Pozanenko at IKI, Moscow <apozanen@iki.rssi.ru>
L. Elenin (KIAM), I. Molotov (KIAM), A. Pozanenko (IKI) report on behalf of
larger GRB follow-up collaboration:
We observed of the field of the Swift GRB 140209A (Cenko et al., GCN
15808) with 0.4-m telescope of ISON-NM observatory starting on Feb., 9 (UT)
07:43:39. Series of 30 s unfiltered exposure were obtained. In the combined
images we do not detect afterglow reported by Perley (GCN 15809).
However we detect possible object (#2) in coordinates (J2000) 05 25 25.55
+32 27 57.2 (uncertainties of 1 arcsec) which is the BAT localization circle
(Cenko et al., GCN 15808) and not present on DSS2(R). The object was
detected only on the combined image of first 10 frames, and not detected on
later combine images.
Preliminary photometry is based on USNO-B1.0 nearby stars:
UT mid, Filter Exposure, OT (3 sigma upper limit), object #2
s
07:45:32 none 10*30 > 18.7 18.2
+/- 0.2
07:58:47 none 10*30 > 18.4 n/d
08:14:05 none 10*30 > 18.3 n/d
GCN Circular 15811
Subject
GRB 140209A: Fermi GBM observation
Date
2014-02-09T17:58:11Z (11 years ago)
From
Andreas von Kienlin at MPE <azk@mpe.mpg.de>
A. von Kienlin (MPE) reports on behalf of the Fermi GBM Team:
"At 07:30:58.23 UT on 09 February 2014, the Fermi Gamma-Ray Burst Monitor
triggered and located GRB 140209A (trigger 413623861 / 140209313),
which was also detected by the Swift/BAT (Cenko et al. 2014, GCN 15808).
The GBM on-ground location is consistent with the Swift position.
The trigger resulted in an Autonomous Repoint Request (ARR) that was
accepted and the spacecraft slewed to the GBM in-flight location. The
initial angle from the LAT boresight was 77 deg from the Fermi/GBM
position.
The GBM light curve consists of a bright pulse with a small precursor
at trigger time with a duration (T90) of about 1.4 s (50-300 keV).
The time-averaged spectrum from T0-0.192 s to T0+2.752 s is best fit by
a Band function with Epeak = 144 +/- 8 keV,
alpha = -0.56 +/- 0.06, and beta = -2.33 +/- 0.07.
The event fluence (10-1000 keV) in this time interval is
(9.5 +/- 0.2)E-06 erg/cm^2. The 0.064-sec peak photon flux measured
starting from T0+1.664 s in the 10-1000 keV band
is 120.5 +/- 3.4 ph/s/cm^2.
The spectral analysis results presented above are preliminary;
final results will be published in the GBM GRB Catalog."
GCN Circular 15812
Subject
GRB 140209A, Swift-BAT refined analysis
Date
2014-02-09T19:27:41Z (11 years ago)
From
Hans Krimm at NASA-GSFC <hans.a.krimm@nasa.gov>
D. M. Palmer (LANL), S. D. Barthelmy (GSFC), W. H. Baumgartner (GSFC/UMBC),
S. B. Cenko (GSFC), J. R. Cummings (GSFC/UMBC), N. Gehrels (GSFC),
H. A. Krimm (GSFC/USRA), A. Y. Lien (NASA/UMBC), C. B. Markwardt (GSFC),
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-61 to T+243 sec from the recent telemetry downlink,
we report further analysis of BAT GRB 140209A (trigger #586071)
(Cenko, et al., GCN Circ. 15808). The BAT ground-calculated position is
RA, Dec = 81.328, 32.488 deg which is
RA(J2000) = 05h 25m 18.7s
Dec(J2000) = +32d 29' 17.3"
with an uncertainty of 1.0 arcmin, (radius, sys+stat, 90% containment).
The partial coding was 38%.
The mask-weighted light curve shows an initial weak pulse from T+0 to T+0.5 sec,
followed by the main pulse from T+1.5 to T+3.5 sec, with a FRED-like profile
with some superimposed structure. This is followed by some low-level
extended emission out to ~T+50 sec. T90 (15-350 keV) is 21.3 +- 8.0 sec
(estimated error including systematics).
The time-averaged spectrum from T+0.15 to T+29.22 sec is best fit by a simple
power-law model. The power law index of the time-averaged spectrum is
1.44 +- 0.06. The fluence in the 15-150 keV band is 4.1 +- 0.2 x 10^-6 erg/cm2.
The 1-sec peak photon flux measured from T+1.69 sec in the 15-150 keV band
is 38.1 +- 1.1 ph/cm2/sec. All the quoted errors are at the 90% confidence
level.
It is possible that this burst falls in the category of short burst with
extended emission.
A lag analysis is underway that will be reported in a subsequent circular.
The results of the batgrbproduct analysis are available at
http://gcn.gsfc.nasa.gov/notices_s/586071/BA/
GCN Circular 15814
Subject
GRB 140209A: Swift-BAT Spectral lag analysis
Date
2014-02-10T13:53:26Z (11 years ago)
From
Scott Barthelmy at NASA/GSFC <scott@lheamail.gsfc.nasa.gov>
J. Norris (BSU), S. D. Barthelmy (GSFC), A. Lien (GSFC), C. Markwardt (GSFC),
T. Sakamoto (AGU), N. Gehrels (GSFC) report:
We report the spectral lag analysis for GRB 140209A (GCN Circ. 15808 & 15812)
based on the BAT data. Using 4-ms binned light curve, the spectral lag
for the 25-50 keV to 100-350 keV bands is 28 (+10/-7) ms, and +34 (+8/-5) ms
for the 15-25 keV to 50-100 keV bands. These lag values are consistant with a Long GRB.
Further, the extended emission is both shorter than the typical extended eimssion of a
Short GRB, and its shape is exponential in decay instead of more flat-like.
And lastly, there is pecursor emission. The lag for the precursor
in the 15-25 keV to 50-100 keV bands is 150 (+36/-30) ms.
GCN Circular 15815
Subject
GRB 140209A: Early RAPTOR Optical Detection
Date
2014-02-10T19:32:06Z (11 years ago)
From
James Wren at LANL <jwren@nis.lanl.gov>
J. Wren, W.T. Vestrand, P. Wozniak, and H. Davis,
of Los Alamos National Laboratory report:
The RAPTOR network of robotic optical telescopes made follow-up observations
of Swift trigger 586071 (Cenko, et al., GCN 15808). Our narrow-field
instruments in Los Alamos, NM, began imaging at 07:31:24.33 UT,
26.5 seconds after the BAT trigger time. We clearly detect the optical
counterpart (Perley, et al., GCN 15809). Our first image at Tmid-Tbat=29.0s
shows the counterpart at an unfiltered magnitude of 14.43+-.04. The
counterpart fades steadily to mag 15.50+-.08 by Tmid-Tbat=65.4s. Our
unfiltered observations were calibrated to the USNO-B1 R-band.
GCN Circular 15818
Subject
Konus-Wind observation of GRB 140209A
Date
2014-02-11T17:13:12Z (11 years ago)
From
Valentin Pal'shin at Ioffe Inst <val@mail.ioffe.ru>
S. Golenetskii, R.Aptekar, V. Pal'shin, D. Frederiks, P. Oleynik, M.
Ulanov, D. Svinkin, A. Tsvetkova and T. Cline on behalf of the
Konus-Wind team report:
The bright GRB 140209A (Swift-BAT trigger #586071: Cenko et al., GCN
15808, Palmer et al., GCN 15812; Fermi-GBM detection: von Kienlin, GCN
15811) triggered Konus-Wind at T0=27060.493 s UT (07:31:00.493).
The burst light curve shows a double peaked pulse with a total duration
of ~1.4 s. The emission is seen up to ~1 MeV.
As observed by Konus-Wind, the burst had a fluence of (7.2 � 0.6)x10^-6
erg/cm2, and a 16-ms peak flux, measured from T0+0.280 s,
of (2.2 � 0.3)x10^-5 erg/cm2/s (both in the 20 keV - 10 MeV energy range).
The time-integrated spectrum (measured from T0 to T0+8.448 s)
is best fit (in the 20 keV - 1 MeV range)
by a power law with exponential cutoff model:
dN/dE ~ (E^alpha)*exp(-E*(2+alpha)/Ep)
with alpha = -1.09(-0.21,+0.23)
and Ep = 173(-20,+15) keV (chi2 = 53.2/55 dof).
Fitting by GRB (Band) model yields the same alpha and Ep,
and an upper limit on the high energy
photon index: beta < -2.8 (chi2 = 53.2/54 dof).
The Konus-Wind light curve of this GRB is available at
http://www.ioffe.ru/LEA/GRBs/GRB140209_T27060/
All the quoted errors are at the 90% confidence level.
All the quoted results are preliminary.
GCN Circular 15819
Subject
GRB 140209A: Swift-XRT observations
Date
2014-02-11T23:17:49Z (11 years ago)
From
Valerio D'Elia at ASDC <delia@asdc.asi.it>
V. D'Elia (ASDC), L. Izzo (URoma/ICRA), S. B. Cenko (GSFC) report on
behalf of the Swift-XRT team:
We have analysed 1.7 ks of XRT data for GRB 140209A (Cenko et al. GCN
Circ. 15808), from 188.1 ks to 195.5 ks after the BAT trigger. The
data are entirely in Photon Counting (PC) mode. Using 1439 s of PC mode
data and 1 UVOT images, we find an enhanced XRT position (using the
XRT-UVOT alignment and matching UVOT field sources to the USNO-B1
catalogue): RA, Dec = 81.32915, +32.49892 which is equivalent to:
RA (J2000): 05h 25m 19.00s
Dec(J2000): +32d 29' 56.1"
with an uncertainty of 3.0 arcsec (radius, 90% confidence). We cannot
determine at the present time whether the source is fading. The
position is consistent with that of the optical afterglow reported by
Perley (GCN Circ. 15809).
The results of the XRT-team automatic analysis are available at
http://www.swift.ac.uk/xrt_products/00586071.
This circular is an official product of the Swift-XRT team.
GCN Circular 15821
Subject
GRB140209A: Swift/UVOT observations.
Date
2014-02-12T12:43:35Z (11 years ago)
From
Massimiliano de Pasquale at MSSL-UCL <m.depasquale@ucl.ac.uk>
M. De Pasquale (MSSL-UCL) & S. B. Cenko (GSFC) report on behalf of the
Swift team:
Swift/UVOT started observations of GRB140209A (Cenko et al., GCN Circ.
15808) 188.1
ks after the burst trigger.
No optical counterpart is detected at the position of XRT counterpart
(D'Elia et al.,
GCN Circ 15819) and the P60 Source (Perley et al., GCN Circ 15809) in summed
exposures.
Preliminary 3-sigma upper limit using the UVOT photometric system
(Breeveld et al al.
2011, AIP Conf. Proc. 1358, 373) is:
Filter T_start (s) T_stop (s) Exp(s) Mag
white 188075 195531 2689 >22.7
No correction has been made for the expected Galactic extinction
corresponding
to E(B-V) = 0.03 in the direction of the burst (Schlegel et al. 1998).
GCN Circular 15822
Subject
Correction to GCN 18521 "GRB140209A: Swift/UVOT observations"
Date
2014-02-12T13:05:17Z (11 years ago)
From
Massimiliano de Pasquale at MSSL-UCL <m.depasquale@ucl.ac.uk>
M. De Pasquale (MSSL-UCL) reports on behalf of the Swift team:
The reddening toward the direction of GRB 140209A quoted in GCN 15821
is actually not correct. The correct value is E(B-V) = 0.79.
We thank D. A. Kann for pointing out the mistake.