- GCN/BACODINE POSITION NOTICE
TITLE: GCN/SWIFT NOTICE
NOTICE_DATE: Thu 25 Jul 13 18:03:22 UT
NOTICE_TYPE: Swift-XRT Position
TRIGGER_NUM: 564028, Seg_Num: 0
GRB_RA: 214.2410d {+14h 16m 57.84s} (J2000),
214.4232d {+14h 17m 41.56s} (current),
213.5703d {+14h 14m 16.86s} (1950)
GRB_DEC: -11.1286d {-11d 07' 42.9"} (J2000),
-11.1910d {-11d 11' 27.4"} (current),
-10.8975d {-10d 53' 51.1"} (1950)
GRB_ERROR: 4.5 [arcsec radius, statistical plus systematic, 90% containment]
GRB_INTEN: 1.00e-10 [erg/cm2/sec]
GRB_SIGNIF: 5.00 [sigma]
IMG_START_DATE: 16498 TJD; 206 DOY; 13/07/25
IMG_START_TIME: 63578.00 SOD {17:39:38.00} UT
TAM[0-3]: 327.61 237.19 261.35 242.66
AMPLIFIER: 2
WAVEFORM: 134
SUN_POSTN: 125.24d {+08h 20m 58s} +19.50d {+19d 29' 50"}
SUN_DIST: 92.96 [deg] Sun_angle= -5.9 [hr] (East of Sun)
MOON_POSTN: 343.72d {+22h 54m 53s} -2.25d {-02d 15' 03"}
MOON_DIST: 127.82 [deg]
MOON_ILLUM: 88 [%]
GAL_COORDS: 334.23, 46.48 [deg] galactic lon,lat of the burst
ECL_COORDS: 215.72, 2.44 [deg] ecliptic lon,lat of the burst
COMMENTS: SWIFT-XRT Coordinates.
COMMENTS: This Notice was ground-generated -- not flight-generated.
COMMENTS: TAM values are not valid.
- red DSS finding chart
ps-file
- GCN Circular #15029
C. A. Swenson (PSU), M. M. Chester (PSU), D. Grupe (PSU),
J. A. Kennea (PSU), H. A. Krimm (CRESST/GSFC/USRA),
B. Sbarufatti (INAF-OAB/PSU), M. H. Siegel (PSU) and B.-B. Zhang (UAH)
report on behalf of the Swift Team:
At 17:39:38 UT, the Swift Burst Alert Telescope (BAT) triggered and
located GRB 130725B (trigger=564028). Swift slewed immediately to the burst.
The BAT on-board calculated location is
RA, Dec 214.232, -11.140 which is
RA(J2000) = 14h 16m 56s
Dec(J2000) = -11d 08' 24"
with an uncertainty of 3 arcmin (radius, 90% containment, including
systematic uncertainty). BAT light curve data are currently unavailable.
Using promptly downlinked data we find a bright, uncatalogued X-ray
source located at RA, Dec 214.24096, -11.12909 which is equivalent to:
RA(J2000) = 14h 16m 57.83s
Dec(J2000) = -11d 07' 44.7"
with an uncertainty of 4.4 arcseconds (radius, 90% containment). This
position may be improved as more data are received; the latest position
is available at http://www.swift.ac.uk/sper.
A power-law fit to a spectrum formed from promptly downlinked event
data gives a column density in excess of the Galactic value (5.15 x
10^20 cm^-2, Kalberla et al. 2005), with an excess column of 3.4
(+4.04/-3.23) x 10^21 cm^-2 (90% confidence).
UVOT data are unavailable at this time.
Burst Advocate for this burst is C. A. Swenson (cswenson AT astro.psu.edu).
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 #15032
M. H Siegel and C. A. Swenson (PSU)
report on behalf of the Swift/UVOT team:
The Swift/UVOT began settled observations of the field of GRB 130725B
72 s after the BAT trigger (Swenson et al., GCN Circ. 15029).
A source consistent with the XRT position
(Swenson et al. GCN Circ. 15029)
is detected in the initial UVOT exposures.
The preliminary UVOT position is:
RA (J2000) = 14:16:57.76 = 214.24068 (deg.)
Dec (J2000) = -11:07:41.8 = -11.12827 (deg.)
with an estimated uncertainty of 0.50 arc sec. (radius, 90% confidence).
Preliminary detections 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 72 221 147 17.29 +/- 0.03
u 284 534 246 17.96 +/- 0.07
The magnitudes in the table are not corrected for the Galactic extinction
due to the reddening of E(B-V) = 0.061 in the direction of the burst
(Schlegel et al. 1998).
- GCN Circular #15034
M. Tanga (MPE Garching), F. Olivares E. (UNAB, MCSS), and J. Greiner
(MPE Garching) report on behalf of the GROND team:
We observed the field of GRB 130725B (Swift trigger 564028; Swenson et al.,
GCN #15029) simultaneously in g'r'i'z'JHK 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 at 00:47 UT on July 26, 2013, 7.1 hours after the
GRB trigger. They were performed at an average seeing of 1.5" and at
an average airmass of 1.2.
We detect the afterglow at the position of Siegel et al. (GCN #15032), and
based on the first images with total exposures of 4.4 minutes in g'r'i'z'
and 8 minutes in JHK, we estimate preliminary magnitudes (all in AB) of
g' = 21.1 +/- 0.1 mag,
r' = 20.5 +/- 0.1 mag,
i' = 20.4 +/- 0.1 mag,
z' = 20.4 +/- 0.1 mag,
J = 20.4 +/- 0.3 mag,
H = 19.9 +/- 0.3 mag, and
K = 19.5 +/- 0.4 mag.
Given magnitudes are calibrated against GROND zeropoints as well as
2MASS field stars and are not corrected for the expected Galactic
foreground extinction corresponding to a reddening of E(B-V) = 0.061 mag in
the direction of the burst (Schlegel et al. 1998).
- GCN Circular #15038
B. Sbarufatti (INAF-OAB/PSU), C. Swenson (PSU), P.A. Evans and
M.R. Goad (U. Leicester) report on behalf of the Swift-XRT team:
Using 4385 s of XRT Photon Counting mode data and 5 UVOT
images, 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 = 214.24065, -11.12845 which is equivalent to:
RA (J2000): 14 16 57.76
Dec (J2000): -11 07 42.4
with an uncertainty of 1.4 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).
- GCN Circular #15039
D. Fugazza, S. Covino, G. Tagliaferri (INAF-OAB), V. D'Elia (INAF-OAR)=20
report on behalf of the CIBO team:
We observed the field of GRB 130725B (Swenson et al., GCN 15029)=20
simultaneously in the optical and near-infrared with the the 60-cm=20
robotic telescope REM at La Silla Observatory (Chile). The observations=20
started at 23:41:40 UT on July 25 2013, about 6.03 hours after the GRB=20
and lasted for about 45 min.
We detect the afterglow reported by Siegel et al. (GCN 15032) and Tanga=20
et al. (GCN 15034) with the upgraded ROS2 optical camera. In the NIR=20
with REMIR camera the afterglow was not detected.
ROS2 is able to observe simultaneously in the g', r', i', and z' filters=20
and preliminary magnitudes (AB) are:
g' =3D 20.65 =B1 0.07
r' =3D 20.32 =B1 0.07
i' =3D 20.08 =B1 0.09
The magnitudes are calibrated against the APASS catalogue.
- GCN Circular #15040
B. Sbarufatti (INAF-OAB/PSU) and C. A. Swenson (PSU) report on behalf
of the Swift-XRT team:
We have analysed 8.2 ks of XRT data for GRB 130725B (Swenson et al.
GCN Circ. 15029), from 53 s to 35.0 ks after the BAT trigger. The
data comprise 235 s in Windowed Timing (WT) mode (the first 8 s were
taken while Swift was slewing) with the remainder in Photon Counting
(PC) mode. Using 6414 s of PC mode data and 9 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 = 214.24059, -11.12851
which is equivalent to:
RA (J2000): 14h 16m 57.74s
Dec(J2000): -11d 07' 42.6"
with an uncertainty of 1.4 arcsec (radius, 90% confidence).
The light curve can be modelled with an initial power-law decay with an
index of alpha=0.09 (+0.15, -0.18), followed by a break at T+534 s to
an alpha of 0.95 (+/-0.05).
A spectrum formed from the PC mode data can be fitted with an absorbed
power-law with a photon spectral index of 1.97 (+0.17, -0.16). The
best-fitting absorption column is 8.3 (+4.2, -3.2) x 10^20 cm^-2,
consistent with the Galactic value of 5.2 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 3.6 x 10^-11 (4.5 x
10^-11) erg cm^-2 count^-1.
A summary of the PC-mode spectrum is thus:
Total column: 8.3 (+4.2, -3.2) x 10^20 cm^-2
Galactic foreground: 5.2 x 10^20 cm^-2
Photon index: 1.97 (+0.17, -0.16)
If the light curve continues to decay with a power-law decay index of
0.95, the count rate at T+24 hours will be 0.012 count s^-1,
corresponding to an observed (unabsorbed) 0.3-10 keV flux of 4.5 x
10^-13 (5.5 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/00564028.
This circular is an official product of the Swift-XRT team.
- GCN Circular #15041
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/GSFC/ORAU), C. B. Markwardt (GSFC), D. M. Palmer (LANL),
T. Sakamoto (AGU), M. Stamatikos (OSU), C. A. Swenson (PSU),
T. N. Ukwatta (MSU) (i.e. the Swift-BAT team):
Using the data set from T-239 to T+454 sec from the recent telemetry downlink,
we report further analysis of BAT GRB 130725B (trigger #564028)
(Swenson, et al., GCN Circ. 15029). The BAT ground-calculated position is
RA, Dec = 214.233, -11.124 deg which is
RA(J2000) = 14h 16m 55.9s
Dec(J2000) = -11d 07' 26.3"
with an uncertainty of 1.2 arcmin, (radius, sys+stat, 90% containment).
The partial coding was 96%.
The mask-weighted light curve shows a single FRED burst peaking at T+1 sec
and decaying to baseline by about T+8 sec. T90 (15-350 keV) is 10.0 +- 3.6
sec (estimated error including systematics).
The time-averaged spectrum from T-0.3 to T+12.8 sec is best fit by a simple
power-law model. The power law index of the time-averaged spectrum is
2.23 +- 0.17. The fluence in the 15-150 keV band is 3.9 +- 0.4 x 10^-7 erg/cm2.
The 1-sec peak photon flux measured from T+0.29 sec in the 15-150 keV band
is 2.2 +- 0.2 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/564028/BA/
- GCN Circular #15044
C. A. Swenson (PSU) reports on behalf of the Swift team:
The BAT trigger time for GRB 130725B (GCN Circ. 15029) was incorrectly
identified. The correct trigger time is 17:39:28 UT. We apologize for
any inconvenience.
- GCN Circular #15045
S. R. Oates (UCL-MSSL) and C. A. Swenson (PSU)
report on behalf of the Swift/UVOT team:
The Swift/UVOT began settled observations of the field of GRB 130725B
72 s after the BAT trigger (Swenson et al. GCN Circ. 15029;
Swenson GCN Circ. 15044).
A source consistent with the enhanced XRT position (Sbarufatti and Swenson GCN Circ. 15040)
is detected in the initial UVOT exposures in all filters except for uvm2 and uvw2.
The non-detection in these filters suggests a redshift ~<2.
The preliminary UVOT position is:
RA (J2000) = 14:16:57.76 = 214.24068 (deg.)
Dec (J2000) = -11:07:41.8 = -11.12827 (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 72 221 147 16.67 +/- 0.03
v 614 6315 252 19.16 +/- 0.27
b 540 559 19 18.20 +/- 0.28
u 284 534 246 17.35 +/- 0.06
w1 663 6725 236 20.01 +/- 0.36
m2 6320 16621 1003 >21.1
w2 4265 4465 197 >20.1
The magnitudes in the table are not corrected for the Galactic extinction
due to the reddening of E(B-V) = 0.061 in the direction of the burst
(Schlegel et al. 1998).
- GCN Report 464.1
GCN_Report 464.1 has been posted:
http://gcn.gsfc.nasa.gov/reports/report_464_1.pdf
by C.A. Swenson
at PSU
titled: "Swift Observations of GRB 130725B"
Previous IAU Circulars 