| Summary table |
|---|
| Variable |
Value |
Source |
| T0 |
0:33:01 UTC |
GCN_circulars,Swift Det |
| ra |
77.3779° |
Swift |
| decl |
-82.6304° |
Swift |
| pos_error |
2.98e-04° |
Swift |
| T90 |
16.4 s |
Swift |
| T90_start |
0:33:01 UTC |
Swift |
| fluence |
3.60e-07 erg/cm² |
Swift |
| T100 |
16.4 s |
|
| GBM_located |
False |
|
| mjd |
56834.02292824074 |
GCN_circulars,Swift Det |
| IPN table |
|---|
| GRB_name |
GRB140626A |
| ra |
77.3500° |
| decl |
-82.6333° |
| pos_error |
5.00e-02° |
| Swift table |
|---|
| GRB_name |
GRB140626A |
| t_trigger |
0:33:01 UTC |
| ra |
77.3779° |
| decl |
-82.6304° |
| pos_error |
2.98e-04° |
| T90 |
16.4 s |
| fluence |
3.60e-07 erg/cm² |
| GCN 16456 table |
|---|
| GRB_name |
GRB140626A |
| GCN_number |
16456 |
| Detection_method |
Swift Det |
| t_trigger |
0:33:01 UTC |
| ra |
77.3500° |
| decl |
-82.6300° |
| Circular_text |
TITLE: GCN CIRCULAR
NUMBER: 16456
SUBJECT: GRB 140626A: Swift detection of a burst
DATE: 14/06/26 00:47:35 GMT
FROM: Scott Barthelmy at NASA/GSFC
J. R. Cummings (NASA/UMBC), S. D. Barthelmy (GSFC),
W. H. Baumgartner (GSFC/UMBC), V. D'Elia (ASDC),
N. Gehrels (NASA/GSFC), J. A. Kennea (PSU),
H. A. Krimm (CRESST/GSFC/USRA), N. P. M. Kuin (UCL-MSSL),
C. B. Markwardt (NASA/GSFC), F. E. Marshall (NASA/GSFC) and
D. M. Palmer (LANL) report on behalf of the Swift Team:
At 00:33:01 UT, the Swift Burst Alert Telescope (BAT) triggered and
located GRB 140626A (trigger=602604). Swift slewed immediately to the burst.
The BAT on-board calculated location is
RA, Dec 77.350, -82.630 which is
RA(J2000) = 05h 09m 24s
Dec(J2000) = -82d 37' 46"
with an uncertainty of 3 arcmin (radius, 90% containment, including
systematic uncertainty). The BAT light curve shows a double pulse
structure with a duration of about 35 sec. The peak count rate
was ~1500 counts/sec (15-350 keV), at ~5 sec after the trigger.
The XRT began observing the field at 00:34:41.7 UT, 99.9 seconds after
the BAT trigger. Using promptly downlinked data we find an uncatalogued
X-ray source located at RA, Dec 77.37387, -82.63218 which is equivalent
to:
RA(J2000) = 05h 09m 29.73s
Dec(J2000) = -82d 37' 55.8"
with an uncertainty of 4.0 arcseconds (radius, 90% containment). This
location is 13 arcseconds from the BAT onboard position, within the BAT
error circle. This position may be improved as more data are received;
the latest position is available at http://www.swift.ac.uk/sper. We
cannot determine whether the source is fading at the present time.
A power-law fit to a spectrum formed from promptly downlinked event
data gives a column density consistent with the Galactic value of 1.42
x 10^21 cm^-2 (Willingale et al. 2013).
UVOT took a finding chart exposure of 150 seconds with the White filter
starting 103 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 100% of
the XRT 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
XRT 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
0.15.
Burst Advocate for this burst is J. R. Cummings (jayc AT milkyway.gsfc.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 16458 table |
|---|
| GRB_name |
GRB140626A |
| GCN_number |
16458 |
| Detection_method |
GROND |
| Circular_text |
TITLE: GCN CIRCULAR
NUMBER: 16458
SUBJECT: GRB 140626A: GROND Afterglow Candidate
DATE: 14/06/26 02:43:50 GMT
FROM: Alexander Kann at TLS Tautenburg
M. Tanga, J. F. Graham (both MPE Garching), D. A. Kann (TLS Tautenburg),
and J. Greiner (MPE Garching) report on behalf of the GROND team:
We observed the field of GRB 140626A (Swift trigger 602604; Cummings et
al., GCN #16456) simultaneously in g'r'i'z'JHK with GROND (Greiner et al.
2008, PASP 120, 405) mounted at the 2.2 m MPG telescope at ESO La Silla
Observatory (Chile).
Observations started at 00:45:12 UT on June 26, 2014, 12 minutes after the
GRB trigger. They were performed at an average seeing of 2.4 and at an
average airmass of 2.5.
We detect a source at the north-eastern edge of the the Swift-XRT error
circle reported by Cummings et al., GCN #16456 at RA (J2000) =
05:09:30.79, Dec. (J2000) = -82:37:50.2, at AB magnitude:
g' = 21.9 +/- 0.1 mag,
r' = 20.9 +/- 0.1 mag,
i' = 20.4 +/- 0.1 mag, and
z' = 19.8 +/- 0.1 mag.
This object is not detected in the DSS. We propose it to be the afterglow
of GRB 140626A but at this time cannot ascertain fading.
The magnitude was derived based on calibrating the image against the GROND
zeropoint and is not corrected for the Galactic foreground extinction
corresponding to a reddening of E_(B-V)= 0.15 mag in the direction of the
burst (Schlegel et al. 1998).
[GCN OPS NOTE(26jun14): Per author's request, the typo of the observation
date in the second paragraph was changed from Jun 22 to Jun 26.]
|
| GCN 16459 table |
|---|
| GRB_name |
GRB140626A |
| GCN_number |
16459 |
| Detection_method |
Swift-XRT Det |
| ra |
77.3801° |
| decl |
-82.6308° |
| Circular_text |
TITLE: GCN CIRCULAR
NUMBER: 16459
SUBJECT: GRB 140626A: Enhanced Swift-XRT position
DATE: 14/06/26 06:37:23 GMT
FROM: Phil Evans at U of Leicester
A.P. Beardmore, P.A. Evans, M.R. Goad and J.P. Osborne (U. Leicester)
report on behalf of the Swift-XRT team.
Using 1162 s of XRT Photon Counting mode data and 3 UVOT
images for GRB 140626A, 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 = 77.38009, -82.63084 which is equivalent
to:
RA (J2000): 05h 09m 31.22s
Dec (J2000): -82d 37' 51.0"
with an uncertainty of 2.1 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 16460 table |
|---|
| GRB_name |
GRB140626A |
| GCN_number |
16460 |
| Detection_method |
Swift-UVOT Other |
| Circular_text |
TITLE: GCN CIRCULAR
NUMBER: 16460
SUBJECT: GRB 140626A: Swift/UVOT Upper Limits
DATE: 14/06/26 12:44:27 GMT
FROM: Paul Kuin at MSSL
N. P. M. Kuin (UCL-MSSL) and J. R. Cummings (NASA/UMBC)
report on behalf of the Swift/UVOT team:
The Swift/UVOT began settled observations of the field of GRB 140626A
103 s after the BAT trigger (Cummings et al., GCN Circ. 16456).
No optical afterglow consistent with the XRT position
(Beardmore et al. GCN Circ. 16459)
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 103 253 147 >20.9
u_FC 262 511 246 >20.3
white 103 1538 392 >21.1
v 592 1590 117 >19.0
b 517 1514 97 >20.0
u 262 1489 343 >20.4
w1 642 1639 117 >19.4
m2 617 1440 39 >19.1
w2 568 1563 117 >19.9
The magnitudes in the table are not corrected for the Galactic extinction
due to the reddening of E(B-V) = 0.15 in the direction of the burst
(Schlegel et al. 1998).
|
| GCN 16461 table |
|---|
| GRB_name |
GRB140626A |
| GCN_number |
16461 |
| Detection_method |
Swift-XRT Other |
| Circular_text |
TITLE: GCN CIRCULAR
NUMBER: 16461
SUBJECT: GRB 140626A: Swift-XRT refined Analysis
DATE: 14/06/26 12:47:04 GMT
FROM: Phil Evans at U of Leicester
J.A. Kennea (PSU), B.P. Gompertz (U. Leicester), J.P. Osborne (U.
Leicester), K.L. Page (U. Leicester), M. de Pasquale (INAF-IASFPA), A.
Maselli (INAF-IASFPA), A. Melandri (INAF-OAB), V. Mangano (PSU), M.C.
Stroh (PSU) and J.R. Cummings report on behalf of the Swift-XRT team:
We have analysed 8.5 ks of XRT data for GRB 140626A (Cummings et al.
GCN Circ. 16456), from 86 s to 18.9 ks after the BAT trigger. The
data comprise 7 s in Windowed Timing (WT) mode (taken while Swift was
slewing), with the remainder in Photon Counting (PC) mode. The enhanced
XRT position for this burst was given by Beardmore et al. (GCN Circ.
16459).
The light curve can be modelled with a power-law decay with a decay
index of alpha=0.52 (+/-0.11).
A spectrum formed from the PC mode data can be fitted with an absorbed
power-law with a photon spectral index of 2.06 (+0.34, -0.27). The
best-fitting absorption column is 1.8 (+1.2, -0.4) x 10^21 cm^-2,
consistent with the Galactic value of 1.4 x 10^21 cm^-2 (Willingale et
al. 2013). The counts to observed (unabsorbed) 0.3-10 keV flux
conversion factor deduced from this spectrum is 3.4 x 10^-11 (4.6 x
10^-11) erg cm^-2 count^-1.
A summary of the PC-mode spectrum is thus:
Total column: 1.8 (+1.2, -0.4) x 10^21 cm^-2
Galactic foreground: 1.4 x 10^21 cm^-2
Excess significance: <1.6 sigma
Photon index: 2.06 (+0.34, -0.27)
If the light curve continues to decay with a power-law decay index of
0.52, the count rate at T+24 hours will be 7.5 x 10^-3 count s^-1,
corresponding to an observed (unabsorbed) 0.3-10 keV flux of 2.5 x
10^-13 (3.4 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/00602604.
This circular is an official product of the Swift-XRT team.
|
| GCN 16462 table |
|---|
| GRB_name |
GRB140626A |
| GCN_number |
16462 |
| Detection_method |
Swift-BAT Det |
| ra |
77.1630° |
| decl |
-82.6250° |
| Circular_text |
TITLE: GCN CIRCULAR
NUMBER: 16462
SUBJECT: GRB 140626A: Swift-BAT refined analysis
DATE: 14/06/26 12:49:33 GMT
FROM: Hans Krimm at NASA-GSFC
M. Stamatikos (OSU), 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), J. Tueller (GSFC), T. N. Ukwatta (MSU)
(i.e. the Swift-BAT team):
Using the data set from T-240 to T+962 sec from the recent telemetry downlink,
we report further analysis of BAT GRB 140626A (trigger #602604)
(Cummings, et al., GCN Circ. 16456). The BAT ground-calculated position is
RA, Dec = 77.163, -82.625 deg which is
RA(J2000) = 05h 08m 39.1s
Dec(J2000) = -82d 37' 29.5"
with an uncertainty of 1.5 arcmin, (radius, sys+stat, 90% containment).
The partial coding was 100%.
The mask-weighted light curve shows a double-peaked structure. The first peak
extends from T-10 sec to T+0 sec, while the second, comparably-sized peak
extends from T+0 sec to T+10 sec. T90 (15-350 keV) is 16.4 +- 1.4 sec (estimated
error including systematics).
The time-averaged spectrum from T-8.94 to T+9.08 sec is best fit by a power law
with an exponential cutoff. This fit gives a photon index 0.61 +- 0.88,
and Epeak of 44.7 +- 9.5 keV (chi squared 45.83 for 56 d.o.f.). For this
model the total fluence in the 15-150 keV band is 3.6 +- 0.5 x 10^-7 erg/cm2
and the 1-sec peak flux measured from T+5.68 sec in the 15-150 keV band is
0.7 +- 0.1 ph/cm2/sec. A fit to a simple power law gives a photon index
of 1.91 +- 0.17 (chi squared 54.28 for 57 d.o.f.). 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/602604/BA/
|
| GCN 16469 table |
|---|
| GRB_name |
GRB140626A |
| GCN_number |
16469 |
| Detection_method |
Optical |
| Circular_text |
TITLE: GCN CIRCULAR
NUMBER: 16469
SUBJECT: GRB 140626A: TAROT La Silla observatory optical observations
DATE: 14/06/28 16:54:48 GMT
FROM: Alain Klotz at IRAP-CNRS-OMP
Klotz A., Turpin D. (IRAP-CNRS-OMP),
Boer M., Gendre B., Siellez K., Dereli H., Bardho O. (UNS-CNRS-OCA),
Atteia J.L. (IRAP-CNRS-OMP) report:
We imaged the field of GRB 140626A detected by SWIFT
(trigger 602604) with the TAROT robotic telescope (D=25cm)
located at the European Southern Observatory,
La Silla observatory, Chile.
The observations started 72.1s after the GRB trigger
(15.9s after the notice). The elevation of the field decreased from
23 degrees above horizon and weather conditions
were good. Images were not accessible during two days
due to a disk access problem.
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 OT with a limiting magnitude of:
t0+72.1s to t0+132.1s : R > 16.6
The second image is 30.0s exposure in tracking mode:
t0+145.4s to t0+175.4s : R > 17.6
We co-added a series of exposures:
t0+145.4s to t0+437.3s : R > 19.2
Magnitudes were estimated with the nearby USNO-B1 stars
and are not corrected for galactic dust extinction.
|