GRB 140215A
GCN Circular 15837
Subject
GRB 140215A: Swift detection of a burst with optical counterpart
Date
2014-02-15T04:16:28Z (11 years ago)
From
David Palmer at LANL <palmer@lanl.gov>
C. B. Markwardt (NASA/GSFC), S. D. Barthelmy (GSFC),
L. M. Z. Hagen (PSU), J. A. Kennea (PSU), V. Mangano (PSU),
F. E. Marshall (NASA/GSFC), C. J. Mountford (U Leicester),
K. L. Page (U Leicester), D. M. Palmer (LANL) and M. H. Siegel (PSU)
report on behalf of the Swift Team:
At 04:07:10 UT, the Swift Burst Alert Telescope (BAT) triggered and
located GRB 140215A (trigger=586680). Swift slewed immediately to the burst.
The BAT on-board calculated location is
RA, Dec 104.136, +41.780 which is
RA(J2000) = 06h 56m 33s
Dec(J2000) = +41d 46' 49"
with an uncertainty of 3 arcmin (radius, 90% containment, including
systematic uncertainty). The BAT light curve shows a couple of overlapping
FRED-like peaks with a duration of about 25 sec. The peak count rate
was ~4500 counts/sec (15-350 keV), at ~0 sec after the trigger.
The XRT began observing the field at 04:09:08.0 UT, 117.7 seconds after
the BAT trigger. XRT found a bright, uncatalogued X-ray source located
at RA, Dec 104.1489, 41.7858 which is equivalent to:
RA(J2000) = +06h 56m 35.74s
Dec(J2000) = +41d 47' 08.9"
with an uncertainty of 6.1 arcseconds (radius, 90% containment). This
location is 40 arcseconds from the BAT onboard position, within the BAT
error circle. No event data are yet available to determine the column
density using X-ray spectroscopy.
The initial flux in the 2.5 s image was 6.19e-10 erg cm^-2 s^-1 (0.2-10
keV).
UVOT took a finding chart exposure of 150 seconds with the White filter
starting 125 seconds after the BAT trigger. There is a candidate afterglow in
the rapidly available 2.7'x2.7' sub-image at
RA(J2000) = 06:56:35.83 = 104.14928
DEC(J2000) = +41:47:11.8 = 41.78660
with a 90%-confidence error radius of about 0.74 arc sec. This position is 3.1
arc sec. from the center of the XRT error circle. The estimated magnitude is
15.08 with a 1-sigma error of about 0.14. No correction has been made for the
expected extinction corresponding to E(B-V) of 0.09.
Burst Advocate for this burst is C. B. Markwardt (Craig.Markwardt 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 15838
Subject
GRB140215A: Prompt Observations with Discovery Channel Telescope
Date
2014-02-15T04:34:40Z (11 years ago)
From
S. Bradley Cenko at NASA/GSFC <brad.cenko@nasa.gov>
S.B. Cenko (NASA-GSFC), V. Toy (UMD), A. Kutyrev (NASA-GSFC), J. Capone
(UMD), E. Troja (NASA-GSFC), A. Cucchiara (NASA-GSFC), S. Veilleux (UMD),
and S. Gezari (UMD) report on behalf of a larger collaboration:
We imaged the location of the Swift GRB140215A (Markwardt et al., GCN 15837) with
the Large Monolithic Imager mounted on the 4.3m Discovery Channel Telescope.
Observations began at 4:09:50 UT on 15 February 2014, ~ 2.7 min after the
Swift BAT trigger time, and were taken under sub-optimal conditions (moderate
cloud cover and bright moon).
We detect the bright optical afterglow in individual exposures beginning at
this time. Using several nearby point sources from USNO-B1 reference, we measure
a magnitude of r' ~ 13.5 mag in our first exposure. Multi-color observations are
ongoing.
We thank the entire staff of the Discovery Channel Telescope for assistance with
these observations.
GCN Circular 15839
Subject
GRB 140215A: KAIT Optical Detection
Date
2014-02-15T04:50:23Z (11 years ago)
From
Weikang Zheng at UC Berkeley <zwk@astro.berkeley.edu>
WeiKang Zheng, Alexei V. Filippenko, Adam Morgan (UC Berkeley), and
S. B. Cenko (NASA/Goddard Space Flight Center) report on behalf of the
KAIT GRB team:
The 0.76-m Katzman Automatic Imaging Telescope (KAIT), located at
Lick Observatory, responded to Swift GRB 140215A (Markwardt et al.,
GCN 15837) starting at 04:09:02 UT, 112 s after the burst.
Observations were performed with an automatic sequence in the
V, I and clear (roughly R) filters, and the exposure time was
20 s per image. We detect the bright optical afterglow (Markwardt
et al., GCN 15837; Cenko et al., GCN 15838) in all the individual
images. The afterglow decayed from mag~13.7 (mid t-t0=189s) to
mag~15.9 (mid t-t0=1094s) in our clear band images calibrated to
USNO B1.0 catalog. Observations are on going.
GCN Circular 15840
Subject
GRB140215A: Skynet PROMPT Optical Observations
Date
2014-02-15T05:45:47Z (11 years ago)
From
Aaron LaCluyze at U.North Carolina <lacluyze@email.unc.edu>
A. LaCluyze, J. Haislip, D. Reichart, A. Trotter, A. Foster, N. Frank, K. Ivarsen, J. Moore, M. Nysewander, R. Beauchemin, T. Berger, M. Carroll, H. T. Cromartie, R. Egger, M. Hinckle, A. Ireland, M. Maples, L. Scott, and J. A. Crain report:
Skynet observed the Swift-BAT localization of GRB 140215A (Markwardt et al., GCN 15837, Swift trigger 586680) with six of the PROMPT telescopes located at CTIO in Chile. Observations began at ~59s after the burst in BVRI and luminance. We detect a fading optical source in all bands at the position of the source detected by Markwardt et al.
A preliminary light curve calibrated to USNOB and NOMAD catalog stars can be found at:
http://www.skynet.unc.edu/grb/grb140215a.png
Further observations are ongoing.
GCN Circular 15841
Subject
GRB 140215A: RATIR Optical and NIR Observations
Date
2014-02-15T05:53:42Z (11 years ago)
Edited On
2024-11-07T18:51:25Z (7 months ago)
From
Nat Butler at Az State U <natbutler@asu.edu>
Edited By
Judith Racusin at NASA/GSFC <judith.racusin@nasa.gov> on behalf of Leo P. Singer at NASA/GSFC <leo.p.singer@nasa.gov>
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), José A. de Diego (UNAM), Leonid Georgiev (UNAM), Jesús
González (UNAM), Carlos Román-Zúñiga (UNAM), Neil Gehrels (GSFC), and
Harvey Moseley (GSFC) report:
We observed the field of GRB 140215A (Markwardt, et al., GCN 15837) with
the Reionization and Transients Infrared Camera (RATIR; www.ratir.org) on
the 1.5m Harold Johnson Telescope at the Observatorio Astronómico Nacional
on Sierra San Pedro Mártir beginning 110 seconds after the Swift BAT
trigger. Initial data were taken out-of-focus, and will require special
handling. In-focus data were acquired from 2014/02 15.20 to 2014/02
15.22UTC (0.65 to 1.13 hours after the BAT trigger), corresponding to
a total of
0.36 hours exposure in the r and i bands and 0.15 hours exposure in the Z,
Y, J, and H bands.
For a source within the Swift UVOT error circle, in comparison with 2MASS,
we obtain the following detections:
r 17.45 +/- 0.01
i 17.08 +/- 0.01
Z 16.82 +/- 0.01
Y 16.55 +/- 0.02
J 16.34 +/- 0.01
H 16.05 +/- 0.01
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 Astronómico Nacional in San Pedro
Mártir. Further observations are ongoing.
GCN Circular 15842
Subject
GRB 140215A: Enhanced Swift-XRT position
Date
2014-02-15T08:38:14Z (11 years ago)
From
Phil Evans at U of Leicester <pae9@leicester.ac.uk>
P.A. Evans, M.R. Goad, J.P. Osborne and A.P. Beardmore (U. Leicester)
report on behalf of the Swift-XRT team.
Using 2359 s of XRT Photon Counting mode data and 4 UVOT
images for GRB 140215A, we find an astrometrically corrected X-ray
position (using the XRT-UVOT alignment and matching UVOT field sources
to the USNO-B1 catalogue): RA, Dec = 104.14917, +41.78625 which is equivalent
to:
RA (J2000): 06h 56m 35.80s
Dec (J2000): +41d 47' 10.5"
with an uncertainty of 1.7 arcsec (radius, 90% confidence).
This position may be improved as more data are received. The latest
position can be viewed at http://www.swift.ac.uk/xrt_positions. Position
enhancement is described by Goad et al. (2007, A&A, 476, 1401) and Evans
et al. (2009, MNRAS, 397, 1177).
This circular was automatically generated, and is an official product of the
Swift-XRT team.
GCN Circular 15843
Subject
GRB 140215A: T24 optical observations
Date
2014-02-15T11:01:22Z (11 years ago)
From
Veli-Pekka Hentunen at Taurus Hill Obs,A95 <veli-pekka.hentunen@kassiopeia.net>
Veli-Pekka Hentunen, Markku Nissinen and Tuomo Salmi (Taurus Hill
Observatory, Varkaus, Finland) report:
We have detected GRB 140215A optical afterglow at iTelescope observatory
T24 (Auberry, California) using 0.61-m/6.5 astrograph and FLI-PL09000
CCD camera. The observations were started at 2014-02-15 04:33:26 (UT)
and stopped at 06:05:49 (UT). Fourteen photometric V filter images and eight
unfiltered images with different exposure time were made.
The afterglow was detected at the following position RA 06:56:35.84 and
DEC +41:47:11.5.
The following magnitudes were obtained from the observations using
NOMAD1 1317-0185429 (V= 13.190 and R=13.190) as a comparison star:
Tmid(s)+T0 Filter Exp. time Mag Mag err.
1107 V 3x60s 17.00V 0.12
2090 V 3x120s 17.30V 0.13
3283 V 3x60s 17.96V 0.34
3678 V 3x120s 17.97V 0.21
4496 V 2x300s 18.44V 0.20
5817 unfiltered 3x60s 18.67CR 0.32
6224 unfiltered 3x120s 18.89CR 0.25
6797 unfiltered 2x300s 19.07CR 0.21
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GCN Circular 15844
Subject
GRB 140215A: P60 observations
Date
2014-02-15T11:03:31Z (11 years ago)
From
Daniel Perley at Caltech <dperley@astro.caltech.edu>
D. A. Perley (Caltech) and S. B. Cenko (NASA-GSFC) report:
The Swift-BAT alert for GRB 140215A (Markwardt et al., GCN 15837)
automatically triggered the Palomar 60-inch telescope, which slewed to
the position and began started a sequence of r, i, and z images
beginning at 04:09:54 UT, 2.74 minutes after the initial trigger. The
optical afterglow is well-detected in all images and filters, and
follow-up has continued through to the present time. The afterglow
light curve fades as a simple unbroken power-law with a decay index of
alpha=1.19 throughout this period. Calibrating relative to USNO-B1.0,
we estimate a magnitude (in the most recent imaging, at 387 minutes
post-trigger) of R = 19.93 +/- 0.13 mag.
Spectroscopic follow-up is encouraged.
GCN Circular 15845
Subject
GRB 140215A: Swift-XRT refined Analysis
Date
2014-02-15T16:18:01Z (11 years ago)
From
Kim Page at U.of Leicester <klp5@leicester.ac.uk>
K.L. Page (U. Leicester) and C. B. Markwardt (NASA/GSFC) report on
behalf of the Swift-XRT team:
We have analysed 7.8 ks of XRT data for GRB 140215A (Markwardt et al.
GCN Circ. 15837), from 124 s to 18.2 ks after the BAT trigger. The
data comprise 159 s in Windowed Timing (WT) mode with the remainder in
Photon Counting (PC) mode. The enhanced XRT position for this burst was
given by Evans et al. (GCN Circ. 15842).
The light curve can be modelled with a power-law decay with a decay
index of alpha=1.21 (+/-0.03).
A spectrum formed from the WT mode data can be fitted with an absorbed
power-law with a photon spectral index of 1.49 (+0.12, -0.07). The
best-fitting absorption column is consistent with the Galactic value
of 9.7 x 10^20 cm^-2 (Kalberla et al. 2005). The PC mode spectrum has a
photon index of 1.91 (+0.18, -0.17) and a best-fitting absorption
column of 1.7 (+/-0.5) x 10^21 cm^-2. The counts to observed
(unabsorbed) 0.3-10 keV flux conversion factor deduced from this
spectrum is 4.0 x 10^-11 (5.4 x 10^-11) erg cm^-2 count^-1.
A summary of the PC-mode spectrum is thus:
Total column: 1.7 (+/-0.5) x 10^21 cm^-2
Galactic foreground: 9.7 x 10^20 cm^-2
Excess significance: 2.5 sigma
Photon index: 1.91 (+0.18, -0.17)
If the light curve continues to decay with a power-law decay index of
1.21, the count rate at T+24 hours will be 5.1 x 10^-3 count s^-1,
corresponding to an observed (unabsorbed) 0.3-10 keV flux of 2.0 x
10^-13 (2.8 x 10^-13) erg cm^-2 s^-1.
The results of the XRT-team automatic analysis are available at
http://www.swift.ac.uk/xrt_products/00586680.
This circular is an official product of the Swift-XRT team.
GCN Circular 15846
Subject
GRB 140215A: ISON-NM optical observations
Date
2014-02-15T20:32:45Z (11 years ago)
From
Alexei Pozanenko at IKI, Moscow <apozanen@iki.rssi.ru>
L. Elenin (KIAM), A. Volnova (IKI), I. Molotov (KIAM), A. Pozanenko (IKI)
report on behalf of larger GRB follow-up collaboration:
We observed of the field of the Swift GRB 140215A (Markwardt et al., GCN
15837) with 0.4-m telescope of ISON-NM observatory starting on Feb., 15
(UT) 04:08:22, i.e 72 seconds after Swift burst trigger. We took 35
unfiltered images of 30 s exposures. We clearly detect the bright optical
afterglow of GRB 140215A (Markwardt et al., GCN 15837; Cenko et al., GCN
15838) in each separate image. Coordinates of the optical afterglow
(J2000) 06 56 35.83 +41 47 11.4 (uncertainties of 0.5 arcsec) coincide with
OT coordinates (Markwardt et al., GCN 15837). Preliminary photometry is
following:
UT mid, T0+ Filter Exposure, OT, err OT
mid s
04:08:22 0.00101 none 30 13.60 0.03
04:37:01 0.02090 none 30 16.46 0.20
The photometry is based on USNO-B1.0 nearby stars:
N USNO-B1.0id RA Dec R2
1 1318-0183851 06:56:13.01 +41:49:29.2 12.37
2 1317-0181981 06:56:37.13 +41:44:34.4 14.39
3 1317-0181986 06:56:38.48 +41:44:12.8 14.50
The power law index of ~-1.2 of our light curve starting from 0.0025 days
and up to the end of our observations coincides with the index reported by
Perley and Cenko (GCN 15844).
GCN Circular 15847
Subject
GRB 140215A: Swift-BAT refined analysis
Date
2014-02-15T22:06:04Z (11 years ago)
From
Scott Barthelmy at NASA/GSFC <scott@lheamail.gsfc.nasa.gov>
S. D. Barthelmy (GSFC), W. H. Baumgartner (GSFC/UMBC), J. R. Cummings (GSFC/UMBC),
N. Gehrels (GSFC), H. A. Krimm (GSFC/USRA), A. Y. Lien (NASA/UMBC),
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-240 to T+824 sec from recent telemetry downlinks,
we report further analysis of BAT GRB 140215A (trigger #586680)
(Markwardt, et al., GCN Circ. 15837). The BAT ground-calculated position is
RA, Dec = 104.129, 41.787 deg, which is
RA(J2000) = 06h 56m 31.0s
Dec(J2000) = +41d 47' 12.2"
with an uncertainty of 1.1 arcmin, (radius, sys+stat, 90% containment).
The partial coding was 15%.
The mask-weighted light curve shows several overlapping peaks starting
at ~T-15 sec, peaking at ~T+1 sec, and ending at ~T+180 sec.
T90 (15-350 keV) is 84.2 +- 53.1 sec (estimated error including systematics).
The time-averaged spectrum from T-1.47 to T+181.76 sec is best fit by a simple
power-law model. The power law index of the time-averaged spectrum is
1.19 +- 0.08. The fluence in the 15-150 keV band is 7.8 +- 0.3 x 10^-6 erg/cm2.
The 1-sec peak photon flux measured from T-0.01 sec in the 15-150 keV band
is 7.9 +- 0.7 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/586680/BA/
GCN Circular 15848
Subject
GRB 140215A: MITSuME Okayama Optical Observation
Date
2014-02-16T02:19:26Z (11 years ago)
From
Daisuke Kuroda at OAO/NAOJ <dikuroda@oao.nao.ac.jp>
D. Kuroda, K. Yanagisawa, Y. Shimizu, H. Toda (OAO, NAOJ),
S. Nagayama (NAOJ), M. Yoshida (Hiroshima), K. Ohta (Kyoto)
and N. Kawai(Tokyo Tech)
report on behalf of MITSuME collaboration:
We observed the field of GRB 140215A (Markwardt et al., GCNC 15837)
with the optical three color (g', Rc and Ic) CCD camera attached
to the MITSuME 50cm telescope of Okayama Astrophysical Observatory.
The observation started on 2014-02-15 10:03:22 UT (~5.9 h after the burst).
We detected the previously reported afterglow (Markwardt et al., GCNC 15837;
Cenko et al., GCNC 15838) in Rc and Ic bands.
Photometric results and three sigma upper limit of the OT are listed below.
We used GSC2.3 catalog for flux calibration.
#T0+[day] MID-UT T-EXP[sec] g' Rc Rc_err Ic Ic_err
------------------------------------------------------------------
0.26209 10:24:34 2880.0 >19.6 18.9 0.2 18.6 0.3
------------------------------------------------------------------
T0+ : Elapsed time after the burst [day]
T-EXP: Total Exposure time [sec]
GCN Circular 15849
Subject
GRB 140215A: Continued RATIR Optical and NIR Observations
Date
2014-02-16T17:45:42Z (11 years ago)
Edited On
2024-11-07T19:58:56Z (7 months ago)
From
Owen Littlejohns at Az State U <olittlej@asu.edu>
Edited By
Vidushi Sharma at NASA GSFC/UMBC <vidushi.sharma@nasa.gov> on behalf of Leo P. Singer at NASA/GSFC <leo.p.singer@nasa.gov>
Owen Littlejohns (ASU), 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),
Enrico Ramirez-Ruiz (UCSC), José A. de Diego (UNAM), Leonid Georgiev
(UNAM), Jesús González (UNAM), Carlos Román-Zúñiga (UNAM), Neil
Gehrels (GSFC), and Harvey Moseley (GSFC) report:
We again observed the field of GRB 140215A (Markwardt, et al.,
GCN 15837) with the Reionization and Transients Infrared Camera
(RATIR; www.ratir.org) on the 1.5m Harold Johnson Telescope at the
Observatorio Astronómico Nacional on Sierra San Pedro Mártir from
2014/02 16.20 to 2014/02 16.36 UTC (24.65 to 28.57 hours after the
BAT trigger), obtaining a total of 2.18 hours exposure in the r and
i bands and 0.88 hours exposure in the Z, Y, J, and H bands.
We continue to detect the previously reported source in all bands, at
fainter magnitudes than the previous epoch of RATIR observations (Butler
et al., GCN 15841). In comparison with 2MASS, we obtain the following
detections:
r 21.51 +/- 0.11
i 21.19 +/- 0.10
Z 21.37 +/- 0.24
Y 20.68 +/- 0.21
J 20.69 +/- 0.16
H 20.43 +/- 0.18
These magnitudes are in the AB system and are not corrected for
Galactic extinction in the direction of the GRB. In comparison to the
previous epoch of RATIR observations the source has faded with
approximate power-law index of t^-1 in all bands.
We thank the staff of the Observatorio Astronómico Nacional in San Pedro
Mártir.
GCN Circular 15850
Subject
GRB140215A: Continued Discovery Channel Telescope Observations
Date
2014-02-16T18:08:36Z (11 years ago)
From
Vicki Toy at UMD <vtoy@astro.umd.edu>
V. Toy (UMD), S.B. Cenko (NASA-GSFC), A. Kutyrev (NASA-GSFC), J. Capone
(UMD), E. Troja (NASA-GSFC), A. Cucchiara (NASA-GSFC), S. Veilleux (UMD),
and S. Gezari (UMD) report on behalf of a larger collaboration:
We re-observed the bright optical afterglow of GRB140215A (Swift trigger
586680, Markwardt et al., GCN 15837, Cenko et al., GCN 15840) with the
Large Monolithic Imager (LMI) on the 4.3m Discovery Channel Telescope (DCT)
at Happy Jack, AZ from 2014/02/16 2:55 to 2014/02/16 4:05 UTC (0.95-1.0
days after the Swift-BAT trigger) in the g',r',i', and z' filters.
Compared with our previous observations, the afterglow continues to follow
an unbroken power law with decay index of alpha=-1.20 in all filters
(Perley et al., GCN 15844, and Elenin et al., GCN 15846), consistent with
the simultaneous temporal decay observed in the X-rays (Page et al., GCN
15845). Specifically we measure r' = 21.6 mag (AB) at a time of 23.5 hr
after the trigger, calibrating relative to USNO-B1.
We thank the entire staff of the Discovery Channel Telescope for assistance
with these observations.
GCN Circular 15852
Subject
GRB 140215A: Swift/UVOT Detection
Date
2014-02-17T00:15:50Z (11 years ago)
From
Lea Hagen at PSU <lea.zernow.hagen@gmail.com>
L. M. Z. Hagen (PSU) and C. B. Markwardt (NASA/GSFC) report on behalf of
the Swift/UVOT team:
The Swift/UVOT began settled observations of the field of GRB 140215A 126 s
after the BAT trigger (Markwardt et al., GCN Circ. 15837). A source
consistent with the XRT position (Evans et al. GCN Circ. 15842) is detected
in the initial UVOT exposures.
The preliminary UVOT position is:
RA (J2000) = 06:56:35.81 = 104.14920 (deg.)
Dec (J2000) = +41:47:11.7 = 41.78659 (deg.)
with an estimated uncertainty of 0.50 arc sec. (radius, 90% confidence).
Preliminary detections and 3-sigma upper limits using the UVOT photometric
system (Breeveld et al. 2011, AIP Conf. Proc. 1358, 373) for the early
exposures are:
Filter T_start(s) T_stop(s) Exp(s) Mag
white (fc) 125 275 147 15.01 +/- 0.04
white 617 637 19 16.26 +/- 0.07
v 106 117 10 14.34 +/- 0.09
b 593 612 19 16.19 +/- 0.09
u 337 587 245 15.53 +/- 0.05
w1 4611 4811 196 >19.86
m2 4406 4606 196 >19.51
w2 642 662 19 >17.93
The magnitudes in the table are not corrected for the Galactic extinction
due to the reddening of E(B-V) = 0.09 in the direction of the burst
(Schlegel et al. 1998). We note that the white photometry may be affected
by a nearby bright foreground star.
GCN Circular 15853
Subject
Konus-Wind observation of GRB 140215A
Date
2014-02-17T15:10:00Z (11 years ago)
From
Dmitry Frederiks at Ioffe Institute <fred@mail.ioffe.ru>
S. Golenetskii, R.Aptekar, D. Frederiks, V. Pal'shin,
P. Oleynik, M. Ulanov, D. Svinkin, and T. Cline on behalf
of the Konus-Wind team, report:
The long-duration GRB 140215A
(Swift-BAT trigger 586680: Markwardt et al., GCN 15837;
Barthelmy et al., GCN 15847)
triggered Konus-Wind at T0=14831.638 s UT (04:07:11.638).
The burst light curve shows a multi-peaked with a total duration of ~15 s.
The emission is seen up to ~10 MeV.
The Konus-Wind light curve of this GRB is available at
http://www.ioffe.ru/LEA/GRBs/GRB140215_T14831/
As observed by Konus-Wind, the burst
had a fluence of (1.84 � 0.15)x10-5 erg/cm2,
and a 64-ms peak flux, measured from T0+4.800 s,
of (3.57 � 0.35)x10-6 erg/cm2/s
(both in the 20 keV - 10 MeV energy range).
The time-averaged spectrum (measured from T0 to T0+15.360 s)
is best fit in the 28 keV - 15 MeV range
by the GRB (Band) function with the following model parameters:
the low-energy photon index alpha = -0.66 � 0.11,
the high energy photon index beta = -2.94 � 0.35,
the peak energy Ep = 214 � 14 keV,
chi2 = 106/95 dof.
The spectrum near the maximum count rate
(measured from T0 to T0+7.168 s)
is best fit in the 20 keV - 15 MeV range
by the GRB (Band) function with the following model parameters:
the low-energy photon index alpha = -0.46 � 0.12,
the high energy photon index beta = -2.83 � 0.26,
the peak energy Ep = 212 � 14 keV,
chi2 = 92.9/96 dof.
All the quoted values are preliminary.
GCN Circular 15855
Subject
GRB 140215A: Continued RATIR Optical and NIR Observations
Date
2014-02-17T17:12:25Z (11 years ago)
Edited On
2024-11-07T18:58:06Z (7 months ago)
From
Nat Butler at Az State U <natbutler@asu.edu>
Edited By
Judith Racusin at NASA/GSFC <judith.racusin@nasa.gov> on behalf of Leo P. Singer at NASA/GSFC <leo.p.singer@nasa.gov>
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), José A. de Diego (UNAM), Leonid Georgiev (UNAM), Jesús
González (UNAM), Carlos Román-Zúñiga (UNAM), Neil Gehrels (GSFC), and
Harvey Moseley (GSFC) report:
We again observed the field of GRB 140215A (Markwardt,, et al., GCN 15837)
with the Reionization and Transients Infrared Camera (RATIR; www.ratir.org)
on the 1.5m Harold Johnson Telescope at the Observatorio Astronómico
Nacional on Sierra San Pedro Mártir from 2014/02 17.11 to 2014/02 17.20 UTC
(46.46 to 48.60 hours after the BAT trigger), obtaining a total of 1.41
hours exposure in the r and i bands and 0.58 hours exposure in the Z, Y, J,
and H bands.
For a source within the Swift-UVOT error circle, in comparison with 2MASS,
we obtain the following detections and upper limits (3-sigma):
r 22.19 +/- 0.24
i 21.65 +/- 0.16
Z > 21.45
Y > 20.71
J > 20.61
H > 20.12
These magnitudes are in the AB system and are not corrected for Galactic
extinction in the direction of the GRB. Compared to our observations last
night (Littlejohns et al., GCN 15849), the source flux is consistent with a
continued fading as t^-1.
We thank the staff of the Observatorio Astronómico Nacional in San Pedro
Mártir.
GCN Circular 15857
Subject
GRB 140215A: WSRT radio observation
Date
2014-02-18T09:22:49Z (11 years ago)
From
Alexander van der Horst at U of Amsterdam <A.J.vanderHorst@uva.nl>
A.J. van der Horst (University of Amsterdam) reports on behalf
of a large collaboration:
"We observed the position of the GRB 140215A afterglow at 4.9 GHz with
the Westerbork Synthesis Radio Telescope at February 17 14.69 UT to
February 18 02.66 UT, i.e. 2.44 - 2.94 days after the burst (GCN 15837).
We do not detect a radio source at the position of the optical
counterpart (GCN 15852). The three-sigma rms noise in the map around
that position is 126 microJy per beam. The formal flux measurement for
a point source at the position of the optical counterpart is 51 +/- 42
microJy.
We would like to thank the WSRT staff for scheduling and obtaining
these observations."
GCN Circular 15858
Subject
GRB 140215A: Continued Skynet PROMPT Observations of the Optical Afterglow
Date
2014-02-18T15:48:45Z (11 years ago)
From
Adam S. Trotter at UNC-Chapel Hill/PROMPT/Skynet <atrotter@physics.unc.edu>
A. LaCluyze, J. Haislip, D. Reichart, A. Trotter, S. Poshyachinda, W.
Rujopakarn, A. Foster, N. Frank, K. Ivarsen, J. Moore, M. Nysewander, R.
Beauchemin, T. Berger, M. Carroll, H. T. Cromartie, R. Egger, M.
Hinckle, A. Ireland, M. Maples, L. Scott, and J. A. Crain report:
Skynet continued observing the Swift-BAT localization of GRB 140215A
(Markwardt et al., GCN 15837, Swift trigger 586680) with six of the
PROMPT telescopes located at CTIO in Chile. LaCluyze et al. (GCN 15840)
described rapid-response observations of a fading optical afterglow
taken between ~1m and 6.5m after the burst in BVRI and luminance, and
presented a preliminary light curve calibrated to USNOB and NOMAD
catalog stars. A revised and recalibrated light curve, including
observations taken at t~20-24h, is at:
http://www.skynet.unc.edu/grb/grb140215a_2.png
In stacks of ~45x160s images from the second night, we do not detect the
afterglow with any degree of confidence (the I-band "detections" in the
light curve plot are most likely spurious.) The 3-sigma limiting
magnitudes are:
Band tmid Limit
I 21.9h >20.2
R 21.0h >20.5
V 21.8h >20.5
B 21.7h >20.3
Magnitudes are in the Vega system, and were calibrated to 4 APASS DR7
catalog stars in the field. They have not been corrected for
line-of-sight MW dust extinction corresponding to E(B-V)=0.09 (Schlegel
et al. 1998).
No further Skynet observations are scheduled.
GCN Circular 15861
Subject
GRB 140215A: RAPTOR Observations During Gamma-Ray Emitting Interval
Date
2014-02-19T15:35:54Z (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 586680 (Markwardt, et al., GCN 15837). Our narrow-field
instruments in Los Alamos, NM, began imaging at 04:07:37.21 UT,
26.9 seconds after the BAT trigger time. We do not detect the counterpart
in our three initial images, with limiting magnitudes near 14.0. The
counterpart then rises above our detection limit and reaches peak brightness
at magnitude 13.5 around T-Tbat=90s. The counterpart then plateaus for
a period of about 50 seconds before beginning a power-law decay. Our
unfiltered observations were calibrated to the USNO-B1 R-band. The following
table summarizes some of our early observations.
t-mid(s) exp(s) mag error
------------------------------------
29.45 5 >14.0
56.85 5 13.8287 0.033
83.85 5 13.5381 0.011
128.95 10 13.5608 0.008
283.35 10 14.3725 0.024
470.75 30 14.9185 0.020