GRB 130514B
GCN Circular 14695
Subject
GRB 130514B: Further Swift-XRT Observations
Date
2013-05-22T20:39:24Z (12 years ago)
From
Binbin Zhang at PSU <bbzhang@psu.edu>
B.-B. Zhang (PSU), Dirk Grupe (PSU). D. Malesani (DARK/NBI) and J. Kennea (PSU)
report on behalf of the Swift-XRT team:
We have analyzed 6.8 ks of XRT data for the INTEGRAL-detected burst:
GRB 130514B, from 314.3 ks to 321.1 ks after the INTERGRAL trigger.
The data are entirely in Photon Counting (PC) mode. We confirm that
the X-ray source reported in Zhang et al. GCN 14651 has been faded with
current count rate of around 3e-3 count/s. The light curve can be modeled with
a power-law decay with a decay index of alpha=0.98 (+0.27, -0.15).
We therefore conclude that the X-ray source reported in Zhang et al. GCN 14651
is the X-ray afterglow of GRB 130514B.
The results of the XRT-team automatic analysis are available at
http://www.swift.ac.uk/xrt_curves/00020275/
This circular is an official product of the Swift-XRT team.
[GCN OPS NOTE(25may13): The "144651" hasn corrected to "14651".]
GCN Circular 14665
Subject
GRB 130514B: RATIR Optical and NIR Observations
Date
2013-05-15T19:03:13Z (12 years ago)
Edited On
2024-11-07T19:58:26Z (a year ago)
From
Alan M. Watson at Instituto de Astronomia UNAM <alan@astro.unam.mx>
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>
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 (UCSC), 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 130514B (Mereghetti, et al., GCN 14638)
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 2013/05 15.15 to
2013/05 15.16 UTC (14.12 to 14.55 hours after the BAT trigger),
obtaining a total of 0.20 hours exposure in the r' and i' bands and 0.08
hours exposure in the Z, Y, J, and H bands.
For a source within the Swift-XRT error circle (Zhang et al., GCN
Circular 14651), in comparison with USNO-B1 and 2MASS, we obtain the
following upper limits (3-sigma):
r' > 22.49
i' > 21.95
Z > 20.53
Y > 20.54
J > 19.66
H > 19.72
These magnitudes are in the AB system and not corrected for Galactic
extinction in the direction of the GRB.
Our non-detection is consistent with the deeper upper limits of Schmidl
et al. (GCN Circular, 14657) obtained a few hours earlier.
We thank the staff of the Observatorio Astronómico Nacional in San Pedro
Mártir.
GCN Circular 14659
Subject
GRB 130514B Swift-BAT observations
Date
2013-05-15T12:25:14Z (12 years ago)
From
Jay R. Cummings at NASA/GSFC/Swift <james.r.cummings@nasa.gov>
J. R. Cummings (UMBC/CRESST/GSFC) and H. A. Krimm (USRA/CRESST/NASA)
report on behalf of the Swift-BAT team:
At the time of the INTEGRAL GRB 130514B (Mereghetti et al. GCN Circ# 14638),
Swift was in a preplanned slew maneuver. BAT photon event data was
collected during this slew. BAT saves such "slew survey" data when possible
within telemetry constraints. The source was detected in a mosaic image.
As seen in BAT, the burst was a single FRED peak about 7 +/- 1 seconds long.
The source had about 10% mask coding in the BAT detector plane.
The BAT spectrum is well-fit by a power-law function with a photon index
of 1.72 +/- 0.21. The fluence from 15-150 keV in 8 seconds was
(8.8 +/- 0.6) x 10^-7 ergs/cm^2/sec. Errors are 68% confidence.
GCN Circular 14657
Subject
GRB 130514B: GROND observations
Date
2013-05-15T10:58:01Z (12 years ago)
From
Alexander Kann at TLS Tautenburg <kann@tls-tautenburg.de>
S. Schmidl, D. A. Kann (both TLS Tautenburg) and J. Greiner (MPE Garching)
report on behalf of the GROND team:
We observed the field GRB 130514B (INTEGRAL trigger 6843; Mereghetti et
al., GCN 14638) simultaneously in g'r'i'z'JHKs with GROND (Greiner et al.
2008, PASP 120, 405) mounted at the 2.2 m MPG/ESO telescope at La Silla
Observatory (Chile).
Observations started in late twilight at 23:11:33.7 UT on May 14th, 9.75
hours after the IBAS trigger. They were performed at an average seeing of
1".6 and at an average airmass of 1.0.
Inside the 1".8 refined XRT error circle (Zhang et al., GCN 14561), we do
not detect any sources. Based on an observation with 1500 s integration
time in g'r'i'z' and 1200 s integration time in JHK, centered at 0.42572
days after the trigger, we estimate preliminary 3-sigma upper limits (all
in AB system) of
g' > 24.7,
r' > 24.4,
J > 21.0,
H > 20.7 and
K > 20.0.
Optically, this GRB is again very faint, similar to GRB 130513A (Schmidl
et al., GCN 14639). Galactic extinction is negligible. The XRT spectrum
shows strong absorption (Zhang et al., GCN 14561), and this is probably
dark GRB.
Given magnitudes are calibrated against GROND zero points (g'r'i'z') as
well as 2MASS field stars (JHK) and are not corrected for the expected
Galactic foreground extinction corresponding to a reddening of
E_(B-V)=0.03 mag in the direction of the burst (Schlegel et al. 1998).
GCN Circular 14651
Subject
GRB 130514B: Swift-XRT Observations
Date
2013-05-15T02:12:20Z (12 years ago)
From
Binbin Zhang at PSU <bbzhang@psu.edu>
B.-B. Zhang (PSU), Dirk Grupe (PSU) and D. Malesani (DARK/NBI) report on
behalf of the Swift-XRT team:
We have analyzed 2.0 ks of XRT data for the INTEGRAL-detected burst:
GRB 130514B, from 5.0 ks to 10.8 ks after the INTEGRAL trigger. The
data are entirely in Photon Counting (PC) mode. An X-ray source is
detected within the INTEGRAL error circle. Using 1475 s of PC mode data
and 2 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 = 147.60859, -18.96517 which is equivalent to:
RA (J2000): 09h 50m 26.06s
Dec(J2000): -18d 57' 54.6"
with an uncertainty of 1.8 arc sec (radius, 90% confidence). This
position is 37 arcsec from the INTEGRAL position.
The X-ray source was detect with a peak count rate of 0.31 count/s
at ~ T0+5359s, where T0= 2013 May 14 at 13:26:29.510 UT, then faded
to a count rate of 0.11 count/s at T0+11 ks.
A spectrum formed from the PC mode data can be fitted with an absorbed
power-law with a photon spectral index of 2.17 (+0.31, -0.30). The
best-fitting absorption column is 3.6 (+1.2, -1.1) x 10^21 cm^-2, in
excess of the Galactic value of 3.6 x 10^20 cm^-2 (Kalberla et al.
2005). The counts to observed (unabsorbed) 0.3-10 keV flux conversion
factor deduced from this spectrum is 3.9 x 10^-11 (7.2 x 10^-11) erg
cm^-2 count^-1.
A summary of the PC-mode spectrum is thus:
Total column: 3.6 (+1.2, -1.1) x 10^21 cm^-2
Galactic foreground: 3.6 x 10^20 cm^-2
Excess significance: 5.0 sigma
Photon index: 2.17 (+0.31, -0.30)
The results of the XRT-team automatic analysis are available at
http://www.swift.ac.uk/xrt_products/00020275.
This circular is an official product of the Swift-XRT team.
GCN Circular 14644
Subject
GRB130514B: MASTER-Net optical observations.
Date
2013-05-14T18:37:30Z (12 years ago)
From
Vladimir Lipunov at Moscow State U/Krylov Obs <gcncirc@observ.inetcomm.ru>
K.Ivanov, S.Yazev, N.M.Budnev, O.Gres, O.Chuvalaev, V.A.Poleshchuk
Irkutsk State University
E. Gorbovskoy, V. Lipunov, V.Kornilov, D.Kuvshinov, A.Belinski, N.Tyurina,
N.Shatskiy, P.Balanutsa, D.Zimnukhov, A.Kuznetsov, V.V.Chazov,
D.Denisenko, A.Sankovich
Sternberg Astronomical Institute, Moscow State University
V.Yurkov, Yu.Sergienko, D.Varda, E.Sinyakov
Blagoveschensk Educational State University, Blagoveschensk
A. Tlatov, A.V. Parhomenko, D. Dormidontov, V.Sennik
Kislovodsk Solar Station of the Pulkovo Observatory
V.Krushinski, I.Zalozhnih, A. Popov
Ural Federal University, Kourovka
Hugo Levato and Carlos Saffe
Instituto de Ciencias Astronomicas, de la Tierra y del Espacio (ICATE)
Claudio Mallamaci, Carlos Lopez and Federico Podest
Observatorio Astronomico Felix Aguilar (OAFA)
MASTER II robotic telescope (MASTER-Net: http://observ.pereplet.ru)
located in Tunka was pointed to the GRB130514B 90 sec after GRB time
but out first image were overlight by evening sky.
The first good image made 3812 sec after GRB time at 2013-05-14 14:30:06.562 UT.
On our first (180s exposure) good set we haven`t found optical transient
within INTEGRAL error-box (S.Mereghetti et. al GCN 14638).
The 5-sigma upper limit has been about 16.5 mag
The observations mae on large zenith distance z=83 deg.
The message may be cited.
GCN Circular 14638
Subject
GRB 130514B: a long GRB detected by INTEGRAL
Date
2013-05-14T14:56:00Z (12 years ago)
From
Sandro Mereghetti at IASF/CNR <sandro@iasf-milano.inaf.it>
S.Mereghetti (IASF-Milano), D.Gotz (CEA, Saclay), C.Ferrigno, E.Bozzo,
E.Filippova (ISDC, Versoix), and J.Borkowski (CAMK, Torun) on behalf of
the IBAS Localization Team report:
a gamma ray burst lasting about 10 s has been detected by IBAS in the
IBIS/ISGRI data at 13:26:32 UT of May 14.
A preliminary analysis gives the coordinates (J2000)
R.A.= 147.604 deg
DEC.= -18.969 deg
with an uncertainty of 3 arcmin (90% c.l.).
The burst had a peak flux of about 1 counts/cm2/s (20-200 keV, 1-s
integration time). Due to telemetry saturation we can only set a lower
limit of 6x10^-7 erg/cmq on the fluence in the same energy range.
A plot of the light curve has been posted at
http://ibas.iasf-milano.inaf.it/IBAS_Results.html