- GCN/BACODINE POSITION NOTICE
TITLE: GCN/SWIFT NOTICE
NOTICE_DATE: Mon 26 Jun 17 09:39:41 UT
NOTICE_TYPE: Swift-BAT GRB Position
TRIGGER_NUM: 758766, Seg_Num: 0
GRB_RA: 165.414d {+11h 01m 39s} (J2000),
165.675d {+11h 02m 42s} (current),
164.664d {+10h 58m 39s} (1950)
GRB_DEC: +56.469d {+56d 28' 09"} (J2000),
+56.375d {+56d 22' 29"} (current),
+56.738d {+56d 44' 17"} (1950)
GRB_ERROR: 3.00 [arcmin radius, statistical only]
GRB_INTEN: 23730 [cnts] Image_Peak=4665 [image_cnts]
TRIGGER_DUR: 1.024 [sec]
TRIGGER_INDEX: 146 E_range: 25-100 keV
BKG_INTEN: 21526 [cnts]
BKG_TIME: 34628.72 SOD {09:37:08.72} UT
BKG_DUR: 8 [sec]
GRB_DATE: 17930 TJD; 177 DOY; 17/06/26
GRB_TIME: 34643.12 SOD {09:37:23.12} UT
GRB_PHI: 79.34 [deg]
GRB_THETA: 8.83 [deg]
SOLN_STATUS: 0x20002003
RATE_SIGNIF: 255.99 [sigma]
IMAGE_SIGNIF: 26.20 [sigma]
MERIT_PARAMS: +1 +0 +0 +0 +2 +9 +0 +0 -50 +0
SUN_POSTN: 95.43d {+06h 21m 43s} +23.34d {+23d 20' 33"}
SUN_DIST: 59.88 [deg] Sun_angle= -4.7 [hr] (East of Sun)
MOON_POSTN: 128.99d {+08h 35m 57s} +16.91d {+16d 54' 28"}
MOON_DIST: 48.16 [deg]
MOON_ILLUM: 8 [%]
GAL_COORDS: 149.09, 54.72 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS: 139.34, 45.19 [deg] ecliptic lon,lat of the burst (or transient)
COMMENTS: SWIFT-BAT GRB Coordinates.
COMMENTS: This Notice was delayed by more than 60 sec past the end of the trigger integration interval;
COMMENTS: probably due to it occurring during a Malindi downlink session.
COMMENTS: This is a rate trigger.
COMMENTS: A point_source was found.
COMMENTS: This does not match any source in the on-board catalog.
COMMENTS: This does not match any source in the ground catalog.
COMMENTS: There is a bright star (mag=2.37) 5.42 arcmin from this position.
COMMENTS: This is a GRB.
COMMENTS: This trigger occurred at longitude,latitude = 12.22,-0.73 [deg].
COMMENTS:
COMMENTS: NOTE: This BAT event is temporally(2.0<100sec) coincident with the FERMI_GBM event (trignum=520162646).
- red DSS finding chart
ps-file
- GCN NOTICE
TITLE: GCN/SWIFT NOTICE
NOTICE_DATE: Mon 26 Jun 17 09:40:14 UT
NOTICE_TYPE: Swift-XRT Position
TRIGGER_NUM: 758766, Seg_Num: 0
GRB_RA: 165.3927d {+11h 01m 34.24s} (J2000),
165.6534d {+11h 02m 36.81s} (current),
164.6430d {+10h 58m 34.31s} (1950)
GRB_DEC: +56.4759d {+56d 28' 33.2"} (J2000),
+56.3817d {+56d 22' 53.9"} (current),
+56.7448d {+56d 44' 41.4"} (1950)
GRB_ERROR: 5.3 [arcsec radius, statistical plus systematic, 90% containment]
GRB_INTEN: 1.52e-09 [erg/cm2/sec]
GRB_SIGNIF: 7.68 [sigma]
IMG_START_DATE: 17930 TJD; 177 DOY; 17/06/26
IMG_START_TIME: 34701.60 SOD {09:38:21.60} UT, 58.5 [sec] since BAT Trigger Time
TAM[0-3]: 327.66 237.22 261.55 243.31
AMPLIFIER: 2
WAVEFORM: 134
SUN_POSTN: 95.43d {+06h 21m 44s} +23.34d {+23d 20' 33"}
SUN_DIST: 59.87 [deg] Sun_angle= -4.7 [hr] (East of Sun)
MOON_POSTN: 128.99d {+08h 35m 59s} +16.91d {+16d 54' 24"}
MOON_DIST: 48.15 [deg]
MOON_ILLUM: 8 [%]
GAL_COORDS: 149.10, 54.71 [deg] galactic lon,lat of the burst
ECL_COORDS: 139.32, 45.19 [deg] ecliptic lon,lat of the burst
COMMENTS: SWIFT-XRT Coordinates.
COMMENTS: The XRT position is 0.81 arcmin from the BAT position.
COMMENTS: There is a bright star (mag=2.37) 6.04 arcmin from the XRT position.
- GCN NOTICE
TITLE: GCN/SWIFT NOTICE
NOTICE_DATE: Mon 26 Jun 17 09:40:23 UT
NOTICE_TYPE: Swift-XRT Image
TRIGGER_NUM: 758766, Seg_Num: 0
GRB_RA: 165.3927d {+11h 01m 34.2s} (J2000),
165.6534d {+11h 02m 36.8s} (current),
164.6430d {+10h 58m 34.3s} (1950)
GRB_DEC: +56.4759d {+56d 28' 33.2"} (J2000),
+56.3817d {+56d 22' 53.9"} (current),
+56.7448d {+56d 44' 41.4"} (1950)
GRB_ERROR: 5.0 [arcsec, radius, statistical plus systematic]
GRB_INTEN: 59 [cnts]
IMG_START_DATE: 17930 TJD; 177 DOY; 17/06/26
IMG_START_TIME: 34701.60 SOD {09:38:21.60} UT, 58.5 [sec] since BAT Trigger Time
CENTROID_X: 318.65, raw= 319 [pixels]
CENTROID_Y: 294.13, raw= 294 [pixels]
ROLL: 267.14 [deg]
GAIN: 1
MODE: 3, Long Image mode
WAVEFORM: 134
EXPO_TIME: 2.50 [sec]
GRB_POS_XRT_Y: -10.05
GRB_POS_XRT_Z: 28.88
IMAGE_URL: sw00758766000msxps_rw.img
SUN_POSTN: 95.43d {+06h 21m 44s} +23.34d {+23d 20' 33"}
SUN_DIST: 59.87 [deg] Sun_angle= -4.7 [hr] (East of Sun)
MOON_POSTN: 129.00d {+08h 35m 59s} +16.91d {+16d 54' 23"}
MOON_DIST: 48.15 [deg]
MOON_ILLUM: 8 [%]
GAL_COORDS: 149.10, 54.71 [deg] galactic lon,lat of the burst
ECL_COORDS: 139.32, 45.19 [deg] ecliptic lon,lat of the burst
COMMENTS: SWIFT-XRT Image.
COMMENTS: There is a bright star (mag=2.37) 5.42 arcmin from the BAT position.
- GCN NOTICE
TITLE: GCN/SWIFT NOTICE
NOTICE_DATE: Mon 26 Jun 17 09:40:25 UT
NOTICE_TYPE: Swift-XRT Processed Image
TRIGGER_NUM: 758766, Seg_Num: 0
GRB_RA: 165.3927d {+11h 01m 34.2s} (J2000),
165.6534d {+11h 02m 36.8s} (current),
164.6430d {+10h 58m 34.3s} (1950)
GRB_DEC: +56.4759d {+56d 28' 33.2"} (J2000),
+56.3817d {+56d 22' 53.9"} (current),
+56.7448d {+56d 44' 41.4"} (1950)
GRB_ERROR: 5.0 [arcsec, radius, statistical plus systematic]
GRB_INTEN: 59 [cnts]
IMG_START_DATE: 17930 TJD; 177 DOY; 17/06/26
IMG_START_TIME: 34701.60 SOD {09:38:21.60} UT, 58.5 [sec] since BAT Trigger Time
CENTROID_X: 318.65, raw= 319 [pixels]
CENTROID_Y: 294.13, raw= 294 [pixels]
ROLL: 267.14 [deg]
GAIN: 1
MODE: 3, Long Image mode
WAVEFORM: 134
EXPO_TIME: 2.50 [sec]
GRB_POS_XRT_Y: -10.05
GRB_POS_XRT_Z: 28.88
IMAGE_URL: sw00758766000msxps_rw.img
SUN_POSTN: 95.43d {+06h 21m 44s} +23.34d {+23d 20' 33"}
SUN_DIST: 59.87 [deg] Sun_angle= -4.7 [hr] (East of Sun)
MOON_POSTN: 129.00d {+08h 35m 59s} +16.91d {+16d 54' 23"}
MOON_DIST: 48.15 [deg]
MOON_ILLUM: 8 [%]
GAL_COORDS: 149.10, 54.71 [deg] galactic lon,lat of the burst
ECL_COORDS: 139.32, 45.19 [deg] ecliptic lon,lat of the burst
COMMENTS: SWIFT-XRT Processed Image.
COMMENTS: There is a bright star (mag=2.37) 5.42 arcmin from the BAT position.
- GCN NOTICE
TITLE: GCN/SWIFT NOTICE
NOTICE_DATE: Mon 26 Jun 17 09:41:23 UT
NOTICE_TYPE: Swift-BAT GRB Lightcurve
TRIGGER_NUM: 758766, Seg_Num: 0
GRB_RA: 165.414d {+11h 01m 39s} (J2000),
165.675d {+11h 02m 42s} (current),
164.664d {+10h 58m 39s} (1950)
GRB_DEC: +56.469d {+56d 28' 09"} (J2000),
+56.375d {+56d 22' 29"} (current),
+56.738d {+56d 44' 17"} (1950)
GRB_DATE: 17930 TJD; 177 DOY; 17/06/26
GRB_TIME: 34643.12 SOD {09:37:23.12} UT
TRIGGER_INDEX: 146
GRB_PHI: 79.34 [deg]
GRB_THETA: 8.83 [deg]
DELTA_TIME: 0.00 [sec]
TRIGGER_DUR: 1.024 [sec]
SOLN_STATUS: 0x2003
RATE_SIGNIF: 255.99 [sigma]
IMAGE_SIGNIF: 26.20 [sigma]
LC_URL: sw00758766000msb.lc
SUN_POSTN: 95.43d {+06h 21m 44s} +23.34d {+23d 20' 33"}
SUN_DIST: 59.88 [deg] Sun_angle= -4.7 [hr] (East of Sun)
MOON_POSTN: 129.01d {+08h 36m 01s} +16.90d {+16d 54' 17"}
MOON_DIST: 48.16 [deg]
MOON_ILLUM: 8 [%]
GAL_COORDS: 149.09, 54.72 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS: 139.34, 45.19 [deg] ecliptic lon,lat of the burst (or transient)
COMMENTS: SWIFT-BAT GRB Lightcurve.
COMMENTS:
COMMENTS: The next comments were copied from the BAT_POS Notice:
COMMENTS: This is a rate trigger.
COMMENTS: A point_source was found.
COMMENTS: This does not match any source in the on-board catalog.
COMMENTS: This does not match any source in the ground catalog.
COMMENTS: There is a bright star (mag=2.37) 5.42 arcmin from this position.
COMMENTS: This is a GRB.
COMMENTS: This trigger occurred at longitude,latitude = 12.22,-0.73 [deg].
- GCN Circular #21264
F. E. Marshall (NASA/GSFC), A. P. Beardmore (U Leicester),
A. A. Breeveld (UCL-MSSL), D. N. Burrows (PSU),
S. W. K Emery (UCL-MSSL), P. A. Evans (U Leicester),
N. P. M. Kuin (UCL-MSSL), K. L. Page (U Leicester),
D. M. Palmer (LANL) and B. Sbarufatti (INAF-OAB/PSU) report on behalf
of the Swift Team:
At 09:37:23 UT, the Swift Burst Alert Telescope (BAT) triggered and
located GRB 170626A (trigger=758766). Swift slewed immediately to the burst.
The BAT on-board calculated location is
RA, Dec 165.414, +56.469 which is
RA(J2000) = 11h 01m 39s
Dec(J2000) = +56d 28' 09"
with an uncertainty of 3 arcmin (radius, 90% containment, including
systematic uncertainty). The BAT light curve showed a multi-peaked
structure with a duration of about 15 sec. The peak count rate
was ~35000 counts/sec (15-350 keV), at ~0 sec after the trigger.
The XRT began observing the field at 09:38:21.6 UT, 58.5 seconds after
the BAT trigger. XRT found a bright, uncatalogued X-ray source located
at RA, Dec 165.3927, 56.4759 which is equivalent to:
RA(J2000) = +11h 01m 34.25s
Dec(J2000) = +56d 28' 33.2"
with an uncertainty of 5.3 arcseconds (radius, 90% containment). This
location is 49 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 1.52e-09 erg cm^-2 s^-1 (0.2-10
keV).
The XRT position is 5.4 arcmin away from a magnitude 2 star (Merak),
therefore there are no UVOT data for this burst.
Burst Advocate for this burst is F. E. Marshall (marshall 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 NOTICE
TITLE: GCN/SWIFT NOTICE
NOTICE_DATE: Mon 26 Jun 17 10:25:54 UT
NOTICE_TYPE: Swift-XRT Position UPDATE
TRIGGER_NUM: 758766, Seg_Num: 0
GRB_RA: 165.3935d {+11h 01m 34.43s} (J2000),
165.6542d {+11h 02m 37.00s} (current),
164.6438d {+10h 58m 34.51s} (1950)
GRB_DEC: +56.4766d {+56d 28' 35.7"} (J2000),
+56.3824d {+56d 22' 56.4"} (current),
+56.7455d {+56d 44' 43.9"} (1950)
GRB_ERROR: 3.5 [arcsec radius, statistical plus systematic, 90% containment]
GRB_INTEN: 1.00e-10 [erg/cm2/sec]
GRB_SIGNIF: 10.00 [sigma]
IMG_START_DATE: 17930 TJD; 177 DOY; 17/06/26
IMG_START_TIME: 35892.00 SOD {09:58:12.00} UT, 1248.9 [sec] since BAT Trigger Time
TAM[0-3]: 100.00 100.00 100.00 100.00
AMPLIFIER: 1
WAVEFORM: 31
SUN_POSTN: 95.46d {+06h 21m 51s} +23.34d {+23d 20' 29"}
SUN_DIST: 59.85 [deg] Sun_angle= -4.7 [hr] (East of Sun)
MOON_POSTN: 129.47d {+08h 37m 53s} +16.83d {+16d 49' 39"}
MOON_DIST: 48.03 [deg]
MOON_ILLUM: 8 [%]
GAL_COORDS: 149.10, 54.71 [deg] galactic lon,lat of the burst
ECL_COORDS: 139.32, 45.19 [deg] ecliptic lon,lat of the burst
COMMENTS: SWIFT-XRT Coordinates.
COMMENTS: There is a bright star (mag=2.37) 6.07 arcmin from the XRT position.
COMMENTS: This Notice was ground-generated -- not flight-generated.
COMMENTS: This is an Update Notice -- the RA,Dec values herein supersede the previous XRT_POS Notice.
COMMENTS: TAM values, flux and significance fields are not valid.
COMMENTS: This position was automatically generated on the ground using
COMMENTS: Photon Counting data telemetered via TDRSS (SPER data).
COMMENTS: See http://www.swift.ac.uk/sper/docs.php for details.
COMMENTS: The probability that this is a serendipitous source in the
COMMENTS: SPER window is 0.58% < P(seren) < 1.1%.
- GCN Circular #21266
R. Hamburg (UAH) and C. Meegan (UAH)
report on behalf of the Fermi GBM Team:
"At 09:37:21.95 UT on 26 June 2017, the Fermi Gamma-Ray Burst Monitor
triggered and located GRB 170626A (trigger 520162646 / 170626401)
which was also detected by the Swift/BAT
(Marshall et al. 2017, GCN 21264).
The GBM on-ground location is consistent with the Swift position.
The angle from the Fermi LAT boresight at the GBM trigger time is 75
degrees.
The GBM light curve shows one main peak
with a duration (T90) of about 12 s (50-300 keV).
The time-averaged spectrum from T0+0.00 to T0+13.6 s is
best fit by a Band function with Epeak = 94 +/- 2 keV,
alpha = -0.74 +/- 0.03, and beta = -2.7 +/- 0.1.
The event fluence (10-1000 keV) in this time interval is
(1.57 +/- 0.03)E-05 erg/cm^2. The 1-sec peak photon flux measured
starting from T0+1.09 s in the 10-1000 keV band
is 37.2 +/- 0.5 ph/s/cm^2.
The spectral analysis results presented above are preliminary;
final results will be published in the GBM GRB Catalog."
- GCN Circular #21267
A. Cholden-Brown (PSU), P.A. Evans (U. Leicester), S.L. Gibson (U.
Leicester), J.P. Osborne (U. Leicester), A. Melandri (INAF-OAB), P.
D'Avanzo (INAF-OAB), V. D'Elia (ASDC), S. J. LaPorte (PSU), J.A. Kennea
(PSU) and F.E. Marshall report on behalf of the Swift-XRT team:
We have analysed 9.4 ks of XRT data for GRB 170626A (Marshall et al.
GCN Circ. 21264), from 51 s to 28.8 ks after the BAT trigger. The data
comprise 1.2 ks in Windowed Timing (WT) mode (the first 6 s were taken
while Swift was slewing) with the remainder in Photon Counting (PC)
mode. The refined XRT position is RA, Dec = 165.3936, +56.4768 which is
equivalent to:
RA (J2000): 11 01 34.46
Dec(J2000): +56 28 36.5
with an uncertainty of 3.5 arcsec (radius, 90% confidence).
The late-time light curve (from T0+5.4 ks) can be modelled with a
power-law decay with a decay index of alpha=1.22 (+/-0.09).
A spectrum formed from the WT mode data can be fitted with an absorbed
power-law with a photon spectral index of 2.019 (+/-0.025). The
best-fitting absorption column is 3.2 (+/-0.5) x 10^20 cm^-2, in
excess of the Galactic value of 6.7 x 10^19 cm^-2 (Willingale et al.
2013). The PC mode spectrum has a photon index of 1.73 (+/-0.08) and a
best-fitting absorption column of 3.2 (+1.8, -1.7) x 10^20 cm^-2. The
counts to observed (unabsorbed) 0.3-10 keV flux conversion factor
deduced from this spectrum is 3.7 x 10^-11 (3.9 x 10^-11) erg cm^-2
count^-1.
A summary of the PC-mode spectrum is thus:
Total column: 3.2 (+1.8, -1.7) x 10^20 cm^-2
Galactic foreground: 6.7 x 10^19 cm^-2
Excess significance: 2.4 sigma
Photon index: 1.73 (+/-0.08)
If the light curve continues to decay with a power-law decay index of
1.22, the count rate at T+24 hours will be 0.039 count s^-1,
corresponding to an observed (unabsorbed) 0.3-10 keV flux of 1.4 x
10^-12 (1.5 x 10^-12) erg cm^-2 s^-1.
The results of the XRT-team automatic analysis are available at
http://www.swift.ac.uk/xrt_products/00758766.
This circular is an official product of the Swift-XRT team.
- GCN Circular #21268
A. S. Moskvitin report on behalf of larger GRB follow-up team:
We observed the field of the GRB 170626A (Marshall et al., GCNC 21264)
with the 1-m telescope of SAO RAS, Zeiss-1000 on June, 26.
The observations started at 19:57:42 UT.
We obtained several images in Rc band and detected possible OT within
the refined XRT error box (Cholden-Brown et al., GCNC 21267).
The coordinates of object are:
R. A. (2000) = 11:01:34.0
Decl. (2000) = +56:28:35.3
the error is about 0.5".
Preliminary photometry of the object: R = 19.7 +/- 0.2,
T - T0 = 10.575 hours (calibration was done by the nearby SDSS stars,
and Lupton 2005 transformation equations).
Due to absence of the observed object at SDSS we can suggest
that it can be GRB OT.
- GCN Circular #21269
A. de Ugarte Postigo (IAA-CSIC, DARK/NBI), and F. Aceituno,
D.A. Kann, L. Izzo, C. Thoene (IAA-CSIC) report on behalf of=20
a larger collaboration:
We observed the field of GRB 170626A (Marshal et al. GCN 21264)
with the 1.5m OSN telescope in Sierra Nevada Observatory (Granada,
Spain). Observation consisted of a series of 240 s R-band exposures,
starting at 20:56:49 UT (11.32 hr after the burst). The afterglow is well=
=20
detected at a position consistent with the one reported by Moskvitin et=20
al. (GCN 21268), (J2000, +/-0.5=E2=80=9D):
R.A.: 11:01:34.09
Dec.: +56:28:35.4
In the combination of the first 12x240s exposures we measure a=20
magnitude of R(AB) =3D 20.6+/- 0.2 as compared to SDSS stars.
- GCN Circular #21270
A. Melandri, P. D'Avanzo (INAF-OAB), V. D'Elia (INAF/OAR & ASI/ASDC), D. Carosati, G. Andreuzzi (INAF-TNG) report on behalf of the CIBO collaboration:
We observed the field of GRB 170626A (Marshall et al., GCN Circ. 21264; Hamburg & Meegan, GCN Circ. 21266) with the 3.6m Telescopio Nazionale Galileo (TNG) equipped with DOLoRes. Observations were carried out in the r-sdss filter. Observations started on Jun 26 at 21:07:35 UT (~11.53 hours after the burst) and consist in a single image lasting 180 seconds.
At the edge of the refined XRT position (Cholden-Brown et al., GCN Circ. 21267) we detect a candidate optical afterglow at the following coordinates: RA(J2000) = 11:01:34.04, Dec(J2000) = +56:28:35.0, with an uncertainty of 0.5". This position is in agreement with the one reported by Moskvitin (GCN Circ. 21268).
The optical afterglow is detected with a magnitude r(AB) = 20.2 +/- 0.2 (calibrated against nearby stars reported in the PAN-STARSS catalogue).
- GCN Circular #21271
S. D. Barthelmy (GSFC), J. R. Cummings (CPI),
H. A. Krimm (NSF/USRA), A. Y. Lien (GSFC/UMBC),
C. B. Markwardt (GSFC), F. E. Marshall (NASA/GSFC),
D. M. Palmer (LANL), T. Sakamoto (AGU),
M. Stamatikos (OSU), T. N. Ukwatta (LANL)
(i.e. the Swift-BAT team):
Using the data set from T-239 to T+963 sec from the recent telemetry downlink,
we report further analysis of BAT GRB 170626A (trigger #758766)
(Marshall et al., GCN Circ. 21264). The BAT ground-calculated position is
RA, Dec = 165.409, 56.479 deg which is
RA(J2000) = 11h 01m 38.1s
Dec(J2000) = +56d 28' 45.4"
with an uncertainty of 1.0 arcmin, (radius, sys+stat, 90% containment).
The partial coding was 96%.
The mask-weighted light curve shows a multi-peaked structure. The main
emission starts at ~ T-1 s, peaks at ~T0, and ends at ~T+12 s. In addition,
there are some weak emissions that start prior to the main pulse at ~T-20 s,
and another weak pulse at ~T+80 s. T90 (15-350 keV) is 12.94 +- 0.34 sec
(estimated error including systematics).
The time-averaged spectrum from T-21.34 to T+17.92 sec is best fit by a power law
with an exponential cutoff. This fit gives a photon index 1.26 +- 0.14,
and Epeak of 120.9 +- 31.0 keV (chi squared 51.05 for 56 d.o.f.). For this
model the total fluence in the 15-150 keV band is 8.2 +- 0.2 x 10^-6 erg/cm2
and the 1-sec peak flux measured from T-0.06 sec in the 15-150 keV band is
23.6 +- 0.6 ph/cm2/sec. A fit to a simple power law gives a photon index
of 1.60 +- 0.03 (chi squared 69.77 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/758766/BA/
- GCN Circular #21272
O.Gres, N.M.Budnev, O.Ershova
Irkutsk State University
V. Lipunov, E.Gorbovskoy, N.Tyurina, V.Kornilov, A.Kuznetsov, V.Vladimirov,
I.Gorbunov, D.Kuvshinov, A.V.Krylov, P.Balanutsa, V.V.Chazov, D. Vlasenko
Lomonosov Moscow State University, Sternberg Astronomical Institut of MSU
A. Tlatov, V.Senik, A.V. Parhomenko, D. Dormidontov
Kislovodsk Solar Station of the Pulkovo Observatory
A.Gabovich, V.Yurkov, Yu.Sergienko
Blagoveschensk Educational State University, Blagoveschensk
D.Buckley, S. Potter, A.Kniazev, M.Kotze
South African Astronomical Observatory
R. Rebolo, M. Serra, N. Lodieu, G. Israelian, L. Suarez-Andres
The Instituto de Astrofisica de Canarias
R.Podesta, C.Lopez, F. Podesta Observatorio Astronomico Felix Aguilar (OAFA),
National University of San Juan, Argentina
H. Levato, C. Saffe
Instituto de Ciencias Astronomicas,de la Tierra y del Espacio (ICATE),
San Juan, Argentina
MASTER II robotic telescope (MASTER-Net: http://observ.pereplet.ru)
located in Tunka was starting inspection on the Swift GRB 170626A
error-box (ra=11 01 34 dec=+56 28 36 r=0.05) 22799 sec after notice time and 24464
sec after trigger time at 2017-06-26 16:45:56 UT. The 5-sigma upper limit
on our added image (3x180s exposure) set is about 19.8 mag .
We see OT with unfiltered magnitude 19.8 +0.2/-0.3 mag at Moskvitin et
al. (GCN #21268) position (see also A. de Ugarte Postigo et al.,GCN
#21269; Melandri et al., GCN #21270; ).
The message may be cited.
- GCN Circular #21273
L. Izzo (IAA-CSIC), L. D'Avino, A. Noschese, M. Mollica, L. Morrone, N. Ruocco, A. Vecchione (AC-OASDG) report:
We observed the field of GRB 170626A (Marshall et al. GCN 21264) with the 0.5m telescope of the Osservatorio Astronomico S. Di Giacomo located in Agerola, Italy ( http://acgo.it/oa ).
We obtained a series of 18x180 s images in the Rc filter, starting at 20:48:16 UT, ~ 11.2 hrs after the GRB trigger. We detect the GRB afterglow (Moskvitin GCN 21268, de Ugarte Postigo et al. GCN 21269, Melandri et al. GCN 21270, Lipunov et al. GCN 21272) and measure a magnitude of R(AB) = 20.1 +- 0.5.
An image of the field can be seen at http://acgo.it/grb26a
- GCN Circular #21274
Y. P. Xu, M. Y. Ge, S. L. Xiong, C. Z. Liu, X. F. Li, Z. W. Li,
J. Y. Liao, X. B. Li, C. K. Li, Y. Huang, Z. Chang, X. F. Lu,
J. L. Zhao, A. M. Zhang, Y. F. Zhang, C. L. Zou (IHEP), Y. J. Jin,
Z. Zhang (THU), Y. P. Chen, M. Gao (IHEP), T. P. Li (IHEP/THU),
G. Li, M. S. Li, H. W. Liu, F. J. Lu, L. M. Song, W. H. Tao, H. Y. Wang,
Y. H. Wang, X. Y. Wen, M. Wu, H. Xu, C. M. Zhang, F. Zhang, J. Zhang,
T. Zhang, S. N. Zhang (IHEP), report on behalf of the Insight-HXMT team:
During the commissioning phase, at 2017-06-26T09:37:22.32 (T0),
Insight-HXMT detected GRB 170626A (trigger ID: HEB170626400)
in a routine search of the data, which was also observed by the Swift/BAT
(Marshall et al. 2017, GCN 21264) and the Fermi/GBM
(Hamburg et al. 2017, GCN 21266).
The Insight-HXMT light curve mainly consists of several pulses
with a duration (T90) of 12.1 s measured from T0-0.43 s.
The 1-second peak rate, measured from T0+0.5 s, is 3275.0 cnts/sec.
The total counts from this burst is 9887 counts.
All measurements above are made with the CsI detectors in the energy range
of about 80-840 keV. Please note that this is the deposited energy,
rather than the incident photon energy.
URL_LC: http://www.hxmt.org/images/GRB/HEB170626400_lc.jpg
The time-averaged spectrum from T0-2.5s to T0+12.5 s is
adequately fit by a Power Law model with spectral index = -1.85 +/- 0.03.
The event fluence (200 -50000 keV) in this time interval is
(1.86 +/- 0.09)E-05 erg/cm^2.
The analysis results presented above are preliminary;
final results will be published elsewhere.
Insight-HXMT is the first Chinese space X-ray telescope, which was funded
jointly by the China National Space Administration (CNSA) and
the Chinese Academy of Sciences (CAS).
More information about this telescope could be found at:
http://www.hxmt.org/index.php/enhome .
- GCN Circular #21276
A. Volnova (IKI), A. Pozanenko (IKI), I. Reva (Fesenkov Astrophysical Institute), E. Mazaeva (IKI), A. Kusakin (Fesenkov Astrophysical Institute), report on behalf of larger GRB follow-up collaboration:
We observed the field of the Swift GRB 170626A (Marshall et al., GCN Circ. 21264; Hamburg & Meegan, GCN Circ. 21266) with Zeiss-1000 1-m telescope of Tien Shan Astronomical Observatory starting on May 20 (UT) 18:42:38. We took several images in R-filter with total exposure of 1130 s. The optical afterglow (Moskvitin et al., GCN 21268; de Ugarte Postigo, et al., GCN 21269) is clearly visible in a stacked image.
Preliminary photometry of the afterglow is following:
Date UT start t-T0 Filter Exp. OT Err. UL
(mid, days) (s) (3 sigma)
2016-06-26 16:47:33 0.30832 R 1130 19.87 0.13 21.0
The magnitude is also compatible with a magnitude of the afterglow reported by Lipunov (GCN 21272) after observation at the same epoch.
Taken into account that between our observation at ~7.4 hours (mid time) and TNG observation at 11.53 hours (Melandri et al., GCN 21270) the magnitude of the aftegrlow did not change one may suggest either flare like activity or plateau phase of the afterglow and the burst can interesting for follow up observations.
The finding chart can be found at http://grb.rssi.ru/GRB170626A/GRB170626a-fc_TShAO.png
The photometry is based on nearby SDSS stars, part of them already used in Moskvitin et al. (GCN 21169).
SDSS_id R_Lupton Err
J110107.23 +564104.2 15.987 0.013
J110157.37 +563628.5 15.225 0.013
J110211.15 +563624.1 15.177 0.012
J110206.51 +563744.1 14.808 0.012
J110111.46 +563755.3 15.480 0.012
(GCN 21169)
J110106.88 +563153.7 16.389 0.013
J110125.73 +563134.0 18.332 0.023
J110124.28 +563251.1 17.839 0.017
- GCN Circular #21277
A. Moskvitin (SAO RAS), A. Volnova (IKI RAS), A. Pozanenko (IKI RAS),
I. Reva (Fesenkov Astrophysical Institute),
report on behalf of larger GRB follow-up team:
We observed the field of the GRB 170626A (Marshall et al., GCNC 21264)
with the 1-m telescope of SAO RAS, Zeiss-1000 on June, 27.
The OT observed by numerous telescopes (de Ugarte Postigo et al.,
GCNC 21269; Melandri et al., GCNC 21270; Gres et al. GCNC 21272;
Izzo et al., GCNC 21273; Volnova et al., GCNC 21276)
is approx. 0.9 magnitude fainer than in previous SAO epoch.
F ~ (t-T0)^ alpha. The decay slope alpha is about -0.7.
ftp://ftp.sao.ru/pub/grb/GRB170626A/GRB170626A_2epochs.png
The result of the first SAO epoch (GCNC 21268) were checked with the
full 1.5 hour stack obtained during the first night.
The stacked frames of both epochs were re-calibrated
against all standards mentioned by Volnova et al. (GCNC 21276).
The results are presented in the following table.
The errors are statistical only.
Date UT start T_mid - T0, d Filter Exp., s mag_OT Err.
2016.06.26 19:57:42 0.4695 Rc 18 x 300 19.83 +/- 0.04 (GCN 21268)
2016.06.27 18:50:27 1.4079 Rc 12 x 300 20.68 +/- 0.07
- GCN Circular #21278
A. Kozlova, S. Golenetskii, R. Aptekar, D. Frederiks, P. Oleynik,
M. Ulanov, D. Svinkin, A. Tsvetkova, A. Lysenko, and T. Cline
on behalf of the Konus-Wind team, report:
The long-duration GRB 170626A (Swift-BAT trigger #758766:
Marshall et al., GCN 21264; Barthelmy et al., GCN 21271;
Fermi GBM observation: Hamburg et al., GCN 21266;
Insight-HXMT observation: Xu et al., GCN 21274)
triggered Konus-Wind at T0=34640.048 s UT (09:37:20.048).
The burst light curve shows a multipeaked structure
started at ~T0-0.4 s with a total duration of ~12.8 s.
The emission is seen up to ~10 MeV.
As observed by Konus-Wind, the burst
had a fluence of 1.22(-0.05,+0.05)x10^-5 erg/cm2,
and a 64-ms peak flux, measured from T0+0.576 s,
of 6.70(-0.97,+0.98)x10^-6 erg/cm2/s
(both in the 20 keV - 10 MeV energy range).
The time-averaged spectrum of the burst
(measured from T0 to T0+15.360 s)
is best fit in the 20 keV - 10 MeV range
by a power law with exponential cutoff model:
dN/dE ~ (E^alpha)*exp(-E*(2+alpha)/Ep)
with alpha = -1.23(-0.10,+0.11)
and Ep = 110(-7,+8) keV (chi2 = 92/99 dof).
Fitting by a GRB (Band) model yields the same alpha and Ep,
the high energy photon index beta = -3.3 (-0.9,+0.4)
(chi2 = 90/98 dof)
The spectrum near the maximum count rate
(measured from T0+0.256 to T0+7.168 s)
is best fit in the 20 keV - 10 MeV range
by a power law with exponential cutoff model
with alpha = -1.17(-0.10,+0.11)
and Ep = 123(-8,+9) keV (chi2 = 78/95 dof).
Fitting by a GRB (Band) model yields the same alpha and Ep,
the high energy photon index beta = -3.5 (-3.1,+0.4)
(chi2 = 77/94 dof)
The Konus-Wind light curve of this GRB is available at
http://www.ioffe.ru/LEA/GRBs/GRB170626_T34640/
All the quoted errors are at the 90% confidence level,
except for beta errors, which are at the 68% confidence level.
All the quoted values are preliminary.
- GCN Circular #21460
K. P. Mooley (Hintze Fellow, Oxford), T. D. Staley, R. P. Fender
(Oxford), G. E. Anderson (Curtin), T. Cantwell (Manchester), D.
Titterington, S. H. Carey, J. Hickish, Y. C. Perrott, N. Razavi-Ghods,
P. Scott (Cambridge), K. Grainge, A. Scaife (Manchester)
The AMI Large Array robotically triggered on the Swift alert for GRB
170626A (Marshall et al., GCN 21264) as part of the 4pisky program, and
subsequent follow up observations were obtained up to 10 days
post-burst. Our observations at 15 GHz on 2016 Jun 26.51, Jun 28.76, Jun
29.67 and Jul 04.66 (UT) do not reveal any radio source at the XRT
location (Cholden-Brown et al., GCN 21267), with 3sigma upper limits of
120 uJy, 138 uJy, 84 uJy and 132 uJy respectively.
We thank the AMI staff for scheduling these observations. The AMI-GRB
database is a log of all GRB follow up observations with the AMI, and is
available at http://4pisky.org/ami-grb/.
Previous IAU Circulars 
