GRB 130313A
GCN Circular 14322
Subject
GRB 130313A: optical upper limit in CrAO
Date
2013-03-16T19:54:45Z (13 years ago)
From
Alexei Pozanenko at IKI, Moscow <apozanen@iki.rssi.ru>
V. Rumyantsev (CrAO), A. Pozanenko (IKI) report on behalf of larger GRB
follow-up collaboration:
We observed the field of the Swift GRB 130313A (Gompertz et al., GCN
14293) with ZTSh telescope of CrAO observatory (Mondy) on March 14
between (UT) 00:23:52 - 02:11:00. We took several images in R-filter of 60
s exposure which cover the refined BAT error box (Barthelmy et al., GCN
14296). Within XRT position (Gompertz et al., GCN 14297; Osborne et al.,
GCN 14300) we do not detect any source. Preliminary photometry of a
combined image is following
UT start, t-t0 filter Exp. OT UL (3 sigma)
(mid, days) (s)
00:23:52 0.3818 R 24x60 n/d 22.7
The photometry is based on USNO-B1.0 star
0896-0256107 15:45:37.83 -00:22:18.2 R=16.04
GCN Circular 14321
Subject
GRB 130313A: optical upper limit in Mondy observatory
Date
2013-03-16T19:54:28Z (13 years ago)
From
Alexei Pozanenko at IKI, Moscow <apozanen@iki.rssi.ru>
A.Volnova (SAI MSU/IKI), E. Klunko (ISTP), A. Pozanenko (IKI) report on
behalf of larger GRB follow-up collaboration:
We observed the field of the Swift GRB 130313A (Gompertz et al., GCN
14293) with AZT-33IK telescope of Sayan observatory (Mondy) on March 13
between (UT) 17:45:47 - 22:55:49. We took several images in R-filter of 90 s
exposure which cover partially the refined BAT error box (Barthelmy et al.,
GCN 14296). Within XRT position (Gompertz et al., GCN 14297; Osborne et
al., GCN 14300) we do not detect any source. Preliminary photometry of
combined images is following
UT start, t-t0 filter Exp. OT UL (3 sigma)
(mid, days) (s)
17:54:56 0.06737 R 20x90 n/d 20.3
17:54:56 0.17047 R 147x90 n/d 23.3
The photometry is based on two SDSS DR8 stars
SDSS J154537.18-001931.3 RA = 15 45 37.18 Dec = -00 19 31.3 (J2000), R =
18.95
SDSS J154535.15-001918.8 RA = 15 45 35.15 Dec = -00 19 18.8 (J2000), R =
16.76
GCN Circular 14319
Subject
GRB130313A: GTC early optical limits
Date
2013-03-16T08:10:39Z (13 years ago)
From
Alberto Castro-Tirado at Inst.de Astro. de Andalucia <ajct@iaa.es>
J. Gorosabel (UPV/EHU-IAA/CSIC), J.C. Tello, R. S�nchez-Ram�rez, M.
Jelinek, A. J. Castro-Tirado (IAA-CSIC Granada), report on behalf of a
larger
collaboration:
"We have observed the field of the short duration GRB 130313A (Gompertz et
al., GCN 14293) using the 10.4m GTC in Sloan r,i and z filters with a
seeing of ~1.3", however at an airmass of ~1.4 and with cirruses across
the field. The combined exposure of 12x70 s images with a Sloan i filter
taken starting 02:54:47UT and ending 03:14:58UT (10.7 - 11.1 hours after
the burst) shows no afterglow candidate within the refined XRT uncertainty
circle (Osborne et al., GCN 14300) down to a magnitude of i > 23.5 when
compared to the SDSS Photometric Catalog, Release 6."
GCN Circular 14318
Subject
GRB 130313A: 5.8 GHz VLA upper limit
Date
2013-03-16T05:55:06Z (13 years ago)
From
Wen-fai Fong at CFA <wfong@cfa.harvard.edu>
W. Fong, B. A. Zauderer and E. Berger (Harvard) report:
"We observed the position of the short-duration GRB 130313A (Gompertz et
al., GCN 14293) with the Karl G. Jansky Very Large Array (VLA) beginning on
2013 March 14.44 UT (18.5 hr post-burst) at a mean frequency of 5.8 GHz. In
1 hour of observations, we do not detect any source within the BAT-refined
position (Barthelmy et al., GCN 14296), within the latest XRT position
(Osborne et al., GCN 14300), or in coincidence with any of the reported
optical sources (de Ugarte Postigo et al., GCN 14302). We therefore place a
3-sigma limit of ~60 microJy on the radio counterpart of GRB 130313A at
18.5 hr after the burst."
GCN Circular 14314
Subject
GRB 130313A: Swift/UVOT Upper Limits
Date
2013-03-15T21:41:57Z (13 years ago)
From
Tyler Pritchard at PSU <tapritchard@astro.psu.edu>
T. A. Pritchard (PSU) and B. P. Gompertz (U Leicester)
report on behalf of the Swift/UVOT team:
The Swift/UVOT began settled observations of the field of GRB 130313A
81 s after the BAT trigger (Gompertz et al., GCN Circ. 14293).
No optical afterglow consistent with the XRT position
(Osborne et al. GCN Circ. 14300)
is detected in the initial UVOT exposures.
Preliminary 3-sigma upper limits using the UVOT photometric system
(Breeveld et al. 2011, AIP Conf. Proc. 1358, 373) for the first
finding chart (FC) exposure and subsequent exposures are:
Filter T_start(s) T_stop(s) Exp(s) Mag
white_FC 81 231 147 >20.6
u_FC 293 543 246 >20.3
white 81 17899 2332 >22.4
v 625 22348 1681 >20.4
b 550 16987 1327 >21.4
u 293 6955 697 >20.3
w1 674 6750 471 >20.9
m2 649 6545 413 >21.0
w2 600 18671 2110 >21.5
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).
GCN Circular 14308
Subject
GRB 130313A: RATIR Optical and NIR Observations
Date
2013-03-14T15:56:30Z (13 years ago)
Edited On
2024-11-07T19:56:23Z (a year ago)
From
Nat Butler at Az State U <natbutler@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>
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), 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 the short-duration GRB 130313A (Gompertz, et al.,
GCN 14293) 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 March 14.30 to
2013 March 14.52 UTC (14.96 to 20.25 hours after the BAT trigger),
obtaining a total of 3.5 hours exposures in the r' and i' bands and 1.5
hours of exposure in the Z, Y, J, and H bands.
For a source within the Swift-XRT error circle (Osborne et al., GCN 14293;
Gompertz et al., GCN 14305), in comparison with SDSS DR8 and 2MASS, we
derive the following upper limits (3-sigma) in the AB magnitude system:
r' > 23.6
i' > 23.3
Z > 22.3
Y > 22.0
J > 21.8
H > 21.3
These magnitudes 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.
GCN Circular 14307
Subject
GRB 130313A: TNG optical observations
Date
2013-03-14T15:45:14Z (13 years ago)
From
Paolo D'Avanzo at INAF-OAB <paolo.davanzo@brera.inaf.it>
P. D'Avanzo, S. Covino, A. Melandri (INAF/OAB), C. P. Padilla Torres, G.
Andreuzzi (INAF/TNG) report on behalf of the CIBO collaboration:
We observed the field of GRB 130313A (Gompertz et al., GCN 14293) with the
TNG telescope located in the Canary Islands. A total 1800 s exposure in
the SDSS r filter was acquired, with mean time 2013 Mar 14.2314 UT (13.4
hours after the GRB). Sky conditions were good and the seeing was 0.9".
No clear optical afterglow is detected inside the refined XRT error circle
(Osborne et al. GCN 14300; Gompertz et al., GCN 14305) down to a limiting
magnitude r~25 mag (3sigma c.l.; calibrated against nearby SDSS stars). In
particular, we do not detect the 3 optical sources reported by de Ugarte
Postigo et al. (GCN 14302).
GCN Circular 14306
Subject
GRB 130313A: Swift-BAT Spectral lag analysis
Date
2013-03-14T14:46:53Z (13 years ago)
From
Takanori Sakamoto at AGU <tsakamoto@phys.aoyama.ac.jp>
J. Norris (BSU), T. Sakamoto (AGU), S. D. Barthelmy (GSFC), N. Gehrels (GSFC)
We report the spectral lag analysis for GRB 130313A (GCN Circ. 14293 & 14296)
based on the BAT data. Using 8-ms binned light curve, the spectral lag
for the 15-25 keV to 50-100 keV bands is 9.2 (+11.5/-7.7) msec.
These lag values place this burst in the short burst category. There is no evidence
for extended emission.
GCN Circular 14305
Subject
GRB 130313A: Fading X-ray Afterglow
Date
2013-03-14T14:09:00Z (13 years ago)
From
Ben Gompertz at U.of Leicester <bpg6@leicester.ac.uk>
B. P. Gompertz& K. L. Page (U. Leicester) report on behalf of the
Swift-XRT team:
Continuing Swift observations of GRB 130313A (Gompertz et al., GCN Circ.
14293) have shown the X-ray source identified by Gompertz& Page (GCN
Circ. 14297) and Osborne et al. (GCN Circ. 14300) has faded. The first
snapshot of data contains 10 counts in 326 seconds, giving a count rate of
0.012 � 0.004 count s^-1, while later data provide an upper limit of
0.0025 count s^-1, corresponding to a single count in 22 ks of data. The
souurce has faded and we therefore confirm that this is the X-ray
afterglow of GRB 130313A.
This circular is an official product of the Swift-XRT team.
GCN Circular 14302
Subject
GRB130313A: Optical observations from GTC
Date
2013-03-14T06:55:45Z (13 years ago)
From
Antonio de Ugarte Postigo at IAA-CSIC <deugarte@iaa.es>
A. de Ugarte Postigo (IAA-CSIC, DARK/NBI), C.C. Thoene (IAA-CSIC),
J. Gorosabel (IAA-CSIC), R. Sanchez-Ramirez (IAA-CSIC), J. P. U. Fynbo
(DARK/NBI) and N. Tanvir (U. Leicester) report:
We have observed the field of the short GRB 130313A (Gompertz et al.,
GCN 14293) using the 10.4m GTC. Observations started at 5:22 UT
(13.23 hr after the burst) and were performed in the r-band in good conditions
and a seeing of ~0.8". The combined 8x120s exposure covers the complete
refined BAT error box (Barthelmy et al., GCN 14296).
We detect a point-like source at the edge of the suggested X-ray afterglow
(Osborne et al., GCN 14300) for which we estimate a preliminary magnitude
of r=26.3+/-0.4, as compared with SDSS stars (we note that the photometry is
complicated by a nearby bright star). This object is located at the following
coordinates (J2000, +/-0.5"):
S1:
R.A.: 15:45:38.45
Dec.: -00:22:03.5
There are two other marginally detected sources consistent with the XRT error
box, one unresolved at:
S2:
R.A.: 15:45:38.21
Dec.: -00:22:10.3
And one extended:
S3:
R.A.: 15:45:38.64
Dec.: -00:22:04.7
A finding chart with these sources can be found at:
http://www.iaa.es/~deugarte/GRBs/130313A/130313A_GTC.jpg
Further observations in search for variability will be needed to determine the relation
of any of these sources with GRB 130313A.
GCN Circular 14301
Subject
GRB 130313A: NOT optical upper limit
Date
2013-03-14T05:00:30Z (13 years ago)
From
Dong Xu at DARK/NBI <dong.dark@gmail.com>
D. Xu (DARK/NBI), S. Schulze (PUC and MCSS), N. R. Tanvir (U.
Leicester), H. Dahle, N. Groeneboom (U. Oslo), and J. P. U. Fynbo (DARK/NBI), report
on behalf of a larger collaboration:
We imaged the field of GRB 130313A (Gompertz et al., GCN 14293) using
the 2.5m Nordic Optical Telescope (NOT) equipped with the ALFOSC
instrument, located on La Palma, Canary Islands. Observations started
at 02:16:32 UT on 2013-03-14 (i.e., 10.139 hr after the BAT trigger)
and 12x300s SDSS_i-band images were obtained in good seeing of ~0.7".
No object was found within the refined XRT error circle (Osborne et
al., GCN 14300) in the stacked image, down to a limit of i>23.4 mag,
calibrated with nearby SDSS stars.
[GCN OPS NOTE(14mar13): Per author's request, NG was added to the author list.]
GCN Circular 14300
Subject
GRB 130313A: Swift-XRT refined Analysis
Date
2013-03-14T04:27:04Z (13 years ago)
From
Phil Evans at U of Leicester <pae9@leicester.ac.uk>
J.P. Osborne (U. Leicester), K.L. Page (U. Leicester), C. Pagani (U.
Leicester), B. Sbarufatti (INAF-OAB/PSU), G. Stratta (ASDC), P.
D'Avanzo (INAF-OAB), J.A. Kennea (PSU), M.C. Stroh (PSU), D.N. Burrows
(PSU) and B.P. Gompertz report on behalf of the Swift-XRT team:
We have analysed 9.1 ks of XRT data for GRB 130313A (Gompertz et al.
GCN Circ. 14293), from 85 s to 18.7 ks after the BAT trigger. The
data are entirely in Photon Counting (PC) mode. The refined XRT
position is RA, Dec = 236.41004, -0.36897 which is equivalent to:
RA (J2000): 15 45 38.41
Dec(J2000): -00 22 08.3
with an uncertainty of 4.8 arcsec (radius, 90% confidence). We cannot
determine at the present time whether the source is fading.
A spectrum formed from the PC mode data can be fitted with an absorbed
power-law with a photon spectral index of 1.6 (+3.4, -4.0). The
best-fitting absorption column is consistent with the Galactic value
of 5.9 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 7.0 x 10^-11 (7.8 x 10^-11) erg cm^-2 count^-1.
A summary of the PC-mode spectrum is thus:
Total column: 0 (+1.7, -0) x 10^23 cm^-2
Galactic foreground: 5.9 x 10^20 cm^-2
Excess significance: <1.6 sigma
Photon index: 1.6 (+3.4, -4.0)
The results of the XRT-team automatic analysis are available at
http://www.swift.ac.uk/xrt_products/00550906.
This circular is an official product of the Swift-XRT team.
GCN Circular 14299
Subject
GRB 130313A: simultaneous and follow-up optical observations at BOOTES-3 and BOOTES-4
Date
2013-03-13T23:25:34Z (13 years ago)
From
Alberto Castro-Tirado at Inst.de Astro. de Andalucia <ajct@iaa.es>
J. C. Tello (IAA-CSIC Granada), S. Guziy (Mykolaiv Nat. Univ.), O.
Lara-Gil, R. Cunniffe, M. Jelinek (IAA-CSIC), J. Gorosabel
(UPV/EHU-IAA/CSIC), P. Kubanek (IP AS CR), Y. Fan, X. Zhao, J. Bai, C. Wang,
Y. Xin (Yunnan Nacional Astronomical Observatory), Ch. Cui (Beijing
National Astronomical Observatory), W. Allen (Vintage Lane Obs.), Ph. Yock
(Auckland Univ.) and A. J. Castro-Tirado (IAA-CSIC), on behalf of a larger
collaboration, report:
�Following the detection of GRB 130313A by Swift (Gompertz et al. GCNC
14293), both the 0.6m BOOTES-3/YA and BOOTES-4/MET robotic telescopes in
Lijiang (China) and Blenheim (New Zealand) responded automatically to the
trigger alert. Due to poor atmospheric/environmental conditions in both
places, not deep limits were obtained: R > 15 (at BOOTES-3) with an
unfiltered 60 second exposure beginning at 16h35m29s UT (27 minutes after
the burst) and R > 18.5 (at BOOTES-4) beginning at 18h12m39s UT (2 hours
after the burst). In addition to these late limits, the CASANDRA-3
wide-field system at BOOTES-3 took unfiltered images (36 seconds exposure
each) beginning at 16h06m44s UT (87 seconds before the burst), 16h07m40s
UT (31 seconds before the burst) and 16h08h36s UT (25 seconds after the
burst). No credible transient is observed down to a limiting magnitude of
R > 8.5.�
GCN Circular 14298
Subject
GRB 130313A: Weihai optical upper limit
Date
2013-03-13T20:36:40Z (13 years ago)
From
Dong Xu at DARK/NBI <dong.dark@gmail.com>
D. Xu (DARK/NBI) and C. Cao, S.-M. Hu (SDU) report:
We imaged the field of GRB 130313A (Gompertz et al., GCN 14293) with
the 1m telescope located in Weihai, Shandong Province, China.
Observations started at 17:41:25 UT on 2013-03-13 (i.e., 1.554 hr
after the BAT trigger) and 5x600s R-band images were obtained.
No optical source is detected within the XRT error circle (Gompertz &
Page, GCN 14297) in the stacked image, down to a limit of R>20.5 mag
calibrated with nearby USNO B1 stars.
We thank Chang-Ming Zhang for carrying out these observations.
GCN Circular 14297
Subject
GRB 130313A: Swift-XRT detection of a possible X-ray afterglow
Date
2013-03-13T20:08:27Z (13 years ago)
From
Kim Page at U.of Leicester <klp5@leicester.ac.uk>
B.P. Gompertz & K.L. Page (U. Leicester) report on behalf of the Swift-XRT
team:
Swift-XRT started observing the field of the short GRB 130313A 78 s after
the BAT trigger (Gompertz et al., GCN Circ. 14293). Using 662 s of XRT
Photon Counting mode data, we find a possible weak source at a position of
RA, Dec = 236.41005, -0.36874, which is equivalent to:
RA (J2000): 15h 45m 38.41s
Dec (J2000): -00d 22' 07.5"
with an uncertainty of 5.3 arcsec (radius, 90% confidence). This is 1.9
arcmin from the BAT refined position (Barthelmy et al., GCN Circ. 14296),
within the error circle.
It is not possible to determine if the source is fading at this time.
This circular is an official product of the Swift-XRT team.
GCN Circular 14296
Subject
GRB 130313A: Swift-BAT refined analysis
Date
2013-03-13T19:48:15Z (13 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),
E. E. Fenimore (LANL), N. Gehrels (GSFC), B.P. Gompertz (U Leicester),
H. A. Krimm (GSFC/USRA), A. Y. Lien (NASA/GSFC/ORAU), C. B. Markwardt (GSFC),
D. M. Palmer (LANL), T. Sakamoto (AGU), G. Sato (ISAS),
M. Stamatikos (OSU), J. Tueller (GSFC), T. N. Ukwatta (MSU)
(i.e. the Swift-BAT team):
Using the data set from T-60 to T+180 sec from the recent telemetry downlink,
we report further analysis of BAT GRB 130313A (trigger #550906)
(Gompertz, et al., GCN Circ. 14293). The BAT ground-calculated position is
RA, Dec = 236.438, -0.355 deg, which is
RA(J2000) = 15h 45m 45.1s
Dec(J2000) = -00d 21' 18.0"
with an uncertainty of 2.6 arcmin, (radius, sys+stat, 90% containment).
The partial coding was 82%.
The mask-weighted light curve shows a single pulse starting at ~T+0.0,
peaking at ~T+0.1 sec, and ending at ~T+0.2 sec. T90 (15-350 keV) is
0.26 +- 0.09 sec (estimated error including systematics).
The time-averaged spectrum from T-0.02 to T+0.23 sec is best fit by a simple
power-law model. The power law index of the time-averaged spectrum is
1.37 +- 0.36. The fluence in the 15-150 keV band is 3.1 +- 0.7 x 10^-8 erg/cm2.
The 1-sec peak photon flux measured from T-0.36 sec in the 15-150 keV band
is 0.5 +- 0.1 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/550906/BA/
GCN Circular 14295
Subject
GRB 130313A: Zadko observatory - Gingin optical observations
Date
2013-03-13T18:15:55Z (13 years ago)
From
Alain Klotz at IRAP-CNRS-OMP <Alain.Klotz@free.fr>
A. Klotz (IRAP-CNRS-OMP), D. Macpherson (UWA/ICRAR), D. Coward (UWA),
B. Gendre (IRAP-CNRS-OMP), M. Boer, K. Siellez, H. Dereli ,
O. Bardho (UNS-CNRS-OCA), A. Williams (PO-UWA), R. Martin (PO-UWA)
report:
We imaged the field of GRB 130313A detected by SWIFT
(trigger 550906) with the Zadko robotic telescope (D=100cm)
located at the observatory - Gingin, Australia.
The observations started 52.3s after the GRB trigger
(34.2s after the notice). The elevation of the field increased from
19 degrees above horizon and weather conditions
were good.
The first image is trailed with a duration of 60.0s
(see the description in Klotz et al., 2006, A&A 451, L39).
We do not detect any optical transcient with a limiting
magnitude of:
t0+52.3s to t0+112.3s : R > 17.2
The second image is 30.0s exposure in tracking mode:
t0+130s to t0+160s : R > 18.6
We co-added a series of exposures:
t0+131s to t0+320.0s : R > 19.3
Magnitudes were estimated with the nearby USNO-B1 stars
and are not corrected for galactic dust extinction.
This message may be cited.
GCN Circular 14294
Subject
GRB 130313A: MASTER-Net optical observations
Date
2013-03-13T16:47:08Z (13 years ago)
From
Vladimir Lipunov at Moscow State U/Krylov Obs <gcncirc@observ.inetcomm.ru>
V.Yurkov, Yu.Sergienko, D.Varda, E.Sinyakov
Blagoveschensk Educational State University, Blagoveschensk
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.Krushinski, I.Zalozhnih, A. Popov
Ural Federal University, Kourovka
A. Tlatov, A.V. Parhomenko, D. Dormidontov, V.Sennik
Kislovodsk Solar Station of the Pulkovo Observatory
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 Blagoveschensk was pointed to the GRB130313A 27 sec after
notice and 45 sec after GRB time at 2013-03-13 16:08:56.268 UT in two
polarizations. On our first (10s exposure) set we haven`t found optical
transient within SWIFT error-box (ra=15 45 39 dec=+00 21 34 r=0.05 d).
The 5-sigma upper limit has been about 15.0 mag.
MASTER II robotic telescope
located in Tunka was pointed to the GRB130313A 85 sec after GRB time at
2013-03-13 16:09:36.11 UT in two polarizations. On our first (20s
exposure) set we haven`t found optical transient within SWIFT error-box.
The 5-sigma upper limit has been about 13.3 mag. Such a low limit is
connected to large zenith distance of observed field (z>85 deg).
The observations are continued.
The message may be cited.
GCN Circular 14293
Subject
GRB 130313A: Swift detection of a short burst
Date
2013-03-13T16:36:56Z (13 years ago)
From
Scott Barthelmy at NASA/GSFC <scott@milkyway.gsfc.nasa.gov>
B.P. Gompertz (U Leicester), S. D. Barthelmy (GSFC),
A. P. Beardmore (U Leicester), D. N. Burrows (PSU), V. D'Elia (ASDC),
S. T. Holland (STScI), C. B. Markwardt (NASA/GSFC),
F. E. Marshall (NASA/GSFC), K. L. Page (U Leicester),
M. H. Siegel (PSU), R. L. C. Starling (U Leicester),
C. A. Swenson (PSU) and E. Troja (NASA/GSFC/UMCP) report on behalf of
the Swift Team:
At 16:08:11 UT, the Swift Burst Alert Telescope (BAT) triggered and
located GRB 130313A (trigger=550906). Swift slewed immediately to the burst.
The BAT on-board calculated location is
RA, Dec 236.423, -0.362 which is
RA(J2000) = 15h 45m 42s
Dec(J2000) = -00d 21' 41"
with an uncertainty of 3 arcmin (radius, 90% containment, including
systematic uncertainty). The BAT light curve shows a single spike
with a duration of about 0.2 sec. The peak count rate
was ~2000 counts/sec (15-350 keV), at ~0 sec after the trigger.
The XRT began observing the field at 16:09:29.2 UT, 78.1 seconds after
the BAT trigger. No source was detected in 737 s of promptly downlinked
data, which covered 93% of the BAT error circle. We are waiting for the
full dataset to detect and localise the XRT counterpart.
UVOT took a finding chart exposure of 150 seconds with the White filter
starting 81 seconds after the BAT trigger. No credible afterglow candidate has
been found in the initial data products. The 2.7'x2.7' sub-image covers 25% of
the BAT error circle. The typical 3-sigma upper limit has been about 19.6 mag.
The 8'x8' region for the list of sources generated on-board covers 100% of the
BAT error circle. The list of sources is typically complete to about 18 mag. No
correction has been made for the expected extinction corresponding to E(B-V) of
0.10.
Burst Advocate for this burst is B.P. Gompertz (bpg6 AT le.ac.uk).
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.)