GRB 201014A
GCN Circular 28741
Subject
GRB 201014A: 2.0m HCT upper limit
Date
2020-10-22T10:03:44Z (5 years ago)
From
Brajesh Kumar at Indian Inst. of Astrophysics <brajesh.kumar@iiap.res.in>
Brajesh Kumar (ARIES, Nainital), Anirban Dutta, G. C. Anupama, D. K.
Sahu, Pramod Kumar (IIA, Bengaluru), Amit Kumar, Avinash Singh (ARIES,
Nainital)
We observed the field of GRB 201014A (Ambrosi et al., GCN 28623, D'Elia
et al., GCN 28626) with the Himalaya Faint Object Spectrograph and
Camera (HFOSC) mounted on the 2-m Himalayan Chandra Telescope (IAO,
Hanle). Three frames (each 300 sec) of the GRB field were obtained in
the Bessell R-band in the average sky conditions. Preliminary PSF
photometry on the stacked image was performed and calibrated against
USNO-B1 catalogue stars. We do not detect any OT candidate (Pozanenko et
al., GCN 28628, de Ugarte Postigo et al, GCN 28650, Dichiara et al.
28654, Zhu et al, GCN 28655, Laskar et al. 28685, Kumar et al. 28689,
Moskvitin et al. 28699) within the enhanced XRT position (Perri et al.,
GCN 28638).
The upper limit in the stacked image is the following:
DATE UT Filter Exposure(sec) Frames Upper limit (mag)
2020-10-15 15:55:29 R 300 3 21.7
We thank the staff at IAO and CREST for helping with the observations.
GCN Circular 28699
Subject
GRB 201014A: SAO RAS optical observations
Date
2020-10-20T13:32:15Z (5 years ago)
From
Moskvitin Alexander at SAO RAS <mosk@sao.ru>
A. S. Moskvitin, V. N. Aitov (SAO RAS)
on behalf of GRB follow-up team report.
We observed the field of GRB 201014A, Swift trigger 1000255
(Ambrosi et al., GCN 28623) with the 1-m telescope of SAO RAS,
Zeiss-1000 + Multi-Mode Photometer-Polarimeter.
We obtained 6 x 300 sec. images in Rc band on October 15,
21:11:44--21:43:50, t_mid - T0 = 0.9439 days since trigger.
Inside the enhanced XRT circle (D���Elia et al., GCN #28626;
Perri et al., GCN #28638) we marginally detected the GRB OT
(Pozanenko et al., GCN #28628; de Ugarte Postigo et al., GCN #28650;
Dichiara et al., GCN #28654; Zhu et al., GCN #28655)
with the brightness of R = 24.0 +/- 0.3 (calibrated against the nearby
SDSS stars, magnitudes converted with the Lupton 2005 equations).
We also obtained 12 x 300 sec. images in Rc band on October 16,
20:55:16--21:59:23, t_mid - T0 = 1.9435 days since trigger.
We did not detect OT down to the limiting magnitude of R_lim = 24.0.
GCN Circular 28689
Subject
GRB 201014A: 3.6m DOT Optical Observations
Date
2020-10-19T15:01:21Z (5 years ago)
From
Amit Kumar at ARIES, India <amitkundu515@gmail.com>
A. Kumar (ARIES), R. Gupta (ARIES), Dimple (ARIES), A. Ghosh (ARIES), A.
Aryan (ARIES), B. Kumar (ARIES), N Panwar (ARIES), S. B. Pandey (ARIES),
and K. Misra (ARIES) report:
We observed the XRT localized GRB 201014A (Swift trigger =1000255, Ambrosi
et al., GCN 28623; Perri et al., GCN 28638) using the 4Kx4K CCD Imager
(Pandey et al. 2018, 2018BSRSL..87...42P) mounted at axial port of the 3.6m
Devasthal Optical Telescope (DOT) of ARIES Nainital. The observations were
carried out on 2020-10-15 in Bessel R-band (300s X 2 frames) from UT
21:22:35 to 21:32:59 (corresponding to 22.6 hours after the BAT trigger
time).
No new optical source was detected within the Swift XRT enhanced error
circle (see also Pozanenko et al., GCN 28628; de Ugarte Postigo et al, GCN
28650, Zhu et al, GCN 28655). The aperture photometry on the stacked R-band
image was performed and calibrated against the USNO-B1 nearby stars.
The 3-sigma upper limit within the XRT error circle is as follows:
T_start-T0 (hours), Start UT, End UT, Filter,
3-sigma upper limit
-------------------------------------------------------------------------------------------------
22.57, 2020-10-15 UT 21:22:35.8, 2020-10-15 UT 21:32:58.9, R, >22.5 mag
The limiting magnitude is not corrected for Galactic extinction in the the
direction of the GRB.
3.6m Devasthal Optical Telescope (DOT) is a recently commissioned
facility in Northern Himalayan region of India (long:79 41 04E, lat:29
21 40N, alt:2540m)
owned and operated by the Aryabhatta Research Institute of
Observational Sciences (ARIES), Nainital (https://www.aries.res.in).
Authors of this GCN circular thankfully acknowledge consistent support
from the staff members to run and maintain the 3.6m DOT.
This circular may be cited.
GCN Circular 28685
Subject
GRB 201014A: MMT afterglow detection
Date
2020-10-19T14:17:38Z (5 years ago)
From
Tanmoy Laskar at U of Bath <tanmoylaskar@gmail.com>
T. Laskar (University of Bath), K. Paterson, J. Rastinejad, C. D.
Kilpatrick, and W. Fong (Northwestern) report on behalf of a larger
collaboration:
"We observed Swift GRB 201014A (Ambrosi et al., GCN 28623) with Binospec on
the MMT 6.5-meter telescope at Mount Hopkins, Arizona. We obtained
10x120-sec imaging in the i' and z' bands beginning on 2020 October 17 at
08:55:10 UT and 09:31:56 UT, respectively.
Within the XRT position (D'Elia et al., GCN 28626; Perri et al., GCN
28638), we detect the previously reported optical afterglow (Pozanenko et
al., GCN 28628; Zhu et al., GCN 28655). Calibrated to SDSS, we measure i' =
23.3 +/- 0.1 mag and z' = 22.8 +/- 0.1 mag at a mid-time of 2.45 days since
the burst. Magnitudes are in the AB system and are not corrected for
Galactic extinction.
We thank Skyler Self and Ben Weiner at the MMT for the rapid scheduling and
execution of these observations.''
GCN Circular 28655
Subject
GRB 201014A: Nanshan/NEXT optical observations
Date
2020-10-16T15:18:30Z (5 years ago)
From
Dong Xu at NAOC/CAS <dxu@nao.cas.cn>
Z.P. Zhu (HUST/NAOC), X. Liu, S.Y. Fu, D. Xu (NAOC), X. Gao (Urumqi No.1
Senior High School), J.Z. Liu (XAO) report:
We observed the field of GRB 201014A (Swift trigger =1000255, Ambrosi et
al., GCN 28623) using the NEXT-0.6m optical telescope located at
Nanshan, Xinjiang, China. Observations automatically started at 22:52:30
UT on 2020-10-14, i.e., 232 s after the BAT trigger, and 3x40s, 4x60s,
12x90s frames in the Sloan r-filter were obtained.
The optical afterglow (Pozanenko et al., GCN 28628; de Ugarte Postigo et
al, GCN 28650) inside the enhanced XRT position (D'Elia et al. GCN
28626) is weakly detected in our stacked image, with r = 20.9 +/- 0.3 at
T-mid = 0.324 hr after the BAT trigger, calibrated with nearby
Pan-STARRS stars.
GCN Circular 28654
Subject
GRB 201014A: Lowell Discovery Telescope afterglow imaging
Date
2020-10-16T14:59:54Z (5 years ago)
From
Simone Dichiara at UMCP/NASA/GSFC <dichiara@umd.edu>
S.Dichiara (UMD, NASA-GSFC), S.B. Cenko (NASA-GSFC), E. Troja (UMD,
NASA-GSFC), P. Gatkine (Caltech), J.M. Durbak (UMD), A. Kutyrev (UMD,
NASA-GSFC), S. Veilleux (UMD), report on behalf of a larger
collaboration:
We observed the field of the GRB 201014A (Ambrosi et al., GCN 28623)
using the Large Monolithic Imager (LMI) on the 4.3m Lowell Discovery
Telescope (LDT) at Happy Jack, AZ. Observations started on October 16,
07:08:10 UT (1.35 days after the Swift trigger) taking 4 exposures of
175 s each with SDSS i and SDSS r filters. Observations were taken
at an airmass of about 1.01 and seeing of about 1.7".
We detected the optical transient (Pozanenko et al., GCN 28628; de Ugarte
Postigo et al, GCN 28650) inside the enhanced XRT position (D'Elia et al.
GCN 28626) measuring the following AB magnitudes: i=22.75 +- 0.07 and
r=24.30 +- 0.12.
Magnitudes are calibrated against the SDSS catalog and not corrected
for Galactic extinction.
The r/i drop-out is consistent with the high-z measured from GTC
(de Ugarte Postigo et al, GCN 28650).
We thank the staff of the Lowell Discovery Telescope and Quanzhi Ye for
assistance with these observations.
[GCN OPS NOTE(18oct2020): Per author's request, the Title "GRB 201014A: Lowell Discovery Telescope upper limits"
was changed to "GRB 201014A: Lowell Discovery Telescope afterglow imaging".]
GCN Circular 28650
Subject
GRB 201014A: Redshift from GTC/OSIRIS
Date
2020-10-16T11:04:06Z (5 years ago)
From
Antonio de Ugarte Postigo at IAA-CSIC <deugarte@iaa.es>
A. de Ugarte Postigo (HETH/IAA-CSIC, DARK/NBI), D.A. Kann, M. Blazek, J.F. Agui Fernandez, C. Thoene (all HETH/IAA-CSIC), G. Gomez Velarde and A. Perez Romero (both GRANTECAN) report:
We observed the afterglow of GRB 201014A (Ambrosi et al. GCN 28623; D���Elia et al. GCN 28626; Pozanenko et al. GCN 28628) with the 10.4m GTC telescope, at Roque de los Muchachos Observatory (La Palma, Spain) equipped with OSIRIS. The observation started on 16 October 2020 at 5:10 UT (30.36 hrs after the GRB onset) and consisted of 3x1200s with the R1000B grism, covering the range between 3700 and 7800 ��.
The spectrum shows signal redwards of 5150 AA, consistent with the Lyman forest, Lyman alpha, SiII, SiIV, OI, and CII at a common redshift of 4.56, which we identify as the redshift of the GRB.
GCN Circular 28644
Subject
GRB 201014A: Swift/UVOT Upper Limits
Date
2020-10-16T04:29:10Z (5 years ago)
From
Sam LaPorte at PSU <sjl5346@psu.edu>
GRB 201014A: Swift/UVOT Upper Limits
J. D. Gropp (PSU) and E. Ambrosi (INAF-IASFPA)
report on behalf of the Swift/UVOT team:
The Swift/UVOT began settled observations of the field of GRB 201014A
176 s after the BAT trigger (Ambrosi et al., GCN Circ. 28623) .
No optical afterglow consistent with the XRT position
(D'Elia et al., GCN Circ. 28626)
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
b 3291 3483 38 >19.17
uvm2 7457 7657 196 >19.18
u 3035 7877 275 >19.82
v 3365 7452 235 >19.24
uvw1 3414 7862 216 >19.25
uvw2 3514 7248 216 >19.32
white 2876 7042 382 >21.14
The magnitudes in the table are not corrected for the Galactic extinction
due to the reddening of E(B-V) = 0.05 in the direction of the burst
(Schlegel et al. 1998).
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GCN Circular 28638
Subject
GRB 201014A: Swift-XRT refined Analysis
Date
2020-10-16T01:59:34Z (5 years ago)
From
Phil Evans at U of Leicester <pae9@leicester.ac.uk>
M. Perri (ASDC), V. D'Elia (ASDC), A. D'Ai (INAF-IASFPA), D.N. Burrows
(PSU), J. D. Gropp (PSU), J.A. Kennea (PSU), J.P. Osborne (U.
Leicester), K.L. Page (U. Leicester), A.P. Beardmore (U. Leicester) and
V.D���Elia report on behalf of the Swift-XRT team:
We have analysed 5.1 ks of XRT data for GRB 201014A (D���Elia et al.
GCN Circ. 28626), from 176 s to 69.0 ks after the BAT trigger. The
data comprise 17 s in Windowed Timing (WT) mode with the remainder in
Photon Counting (PC) mode. Using 1385 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 =
20.79619, +27.66024 which is equivalent to:
RA (J2000): 01h 23m 11.09s
Dec(J2000): +27d 39' 36.9"
with an uncertainty of 1.8 arcsec (radius, 90% confidence).
The light curve can be modelled with an initial power-law decay with an
index of alpha=3.8 (+1.7, -0.7), followed by a break at T+360 s to an
alpha of 0.58 (+0.09, -0.07).
A spectrum formed from the PC mode data can be fitted with an absorbed
power-law with a photon spectral index of 1.92 (+0.27, -0.24). The
best-fitting absorption column is 1.1 (+0.8, -0.4) x 10^21 cm^-2,
consistent with the Galactic value of 7.9 x 10^20 cm^-2 (Willingale et
al. 2013). The counts to observed (unabsorbed) 0.3-10 keV flux
conversion factor deduced from this spectrum is 3.5 x 10^-11 (4.3 x
10^-11) erg cm^-2 count^-1.
A summary of the PC-mode spectrum is thus:
Total column: 1.1 (+0.8, -0.4) x 10^21 cm^-2
Galactic foreground: 7.9 x 10^20 cm^-2
Excess significance: <1.6 sigma
Photon index: 1.92 (+0.27, -0.24)
The results of the XRT-team automatic analysis are available at
http://www.swift.ac.uk/xrt_products/01000255.
This circular is an official product of the Swift-XRT team.
GCN Circular 28630
Subject
GRB 201014A: BOOTES-1 and -2 early optical upper limits
Date
2020-10-15T17:13:22Z (5 years ago)
From
Youdong HU at IAA-CSIC <huyoudong072@hotmail.com>
Y.-D. Hu, E. Fernandez-Garcia, A. J. Castro-Tirado (IAA-CSIC), C. Perez del Pulgar, A. Castellon, I. Carrasco, A. Reina (Univ. de Malaga), R. Fernandez-Munoz (IHSM/UMA-CSIC) and F. Rendon (IAA-CSIC and INTA-CEDEA) on behalf of a larger collaboration, report:
Following the Swift trigger of GRB 201014A (Ambrosi et al., GCNC 28623), the 60cm BOOTES-2/TELMA robotic telescope at IHSM La Mayora (UMA-CSIC) in Algarrobo Costa (Malaga, Spain) automatically responded to this event. A series of images were taken starting 22:50:46UT (132 s after trigger) with clear filter. In the co-added 60s exposure image, no soure is detected which down to 20.6 mag at the XRT afterglow position (D��Elia et al., GCNC 28626).
The 0.3m BOOTES-1B robotic telescope in Mazagon (Huelva), southern Spain, automatically responded to this event at 22:50:20UT (102 s after trigger). In the co-added of 60 s exposure images, no new source is detected which down to 20.3 mag (clear filter).
These early optical non-detections are consistent with the afterglow magnitude reported by Pozanenko et al. (GCNC 28628).
We thank the staff at INTA-CEDEA and La Mayora for their excellent support.
GCN Circular 28629
Subject
GRB 201014A: Swift-BAT refined analysis
Date
2020-10-15T17:09:01Z (5 years ago)
From
Amy Lien at GSFC <amy.y.lien@nasa.gov>
A. Y. Lien (GSFC/UMBC), E. Ambrosi (INAF-IASFPA),
S. D. Barthelmy (GSFC), J. R. Cummings (CPI),
H. A. Krimm (NSF), S. Laha (GSFC/UMBC),
C. B. Markwardt (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 201014A (trigger #1000255)
(Ambrosi et al., GCN Circ. 28623; D'Elia et al., GCN Circ 28626).
The BAT ground-calculated position is
RA, Dec = 20.834, 27.722 deg which is
RA(J2000) = 01h 23m 20.2s
Dec(J2000) = +27d 43' 19.1"
with an uncertainty of 2.5 arcmin, (radius, sys+stat, 90% containment).
The partial coding was 100%.
The mask-weighted light curve shows a weak pulse that starts at ~T+30 s
and ends at ~T+70 s. T90 (15-350 keV) is 36.2 +- 8.1 sec (estimated
error including systematics).
The time-averaged spectrum from T+30.16 to T+69.84 sec is best fit by
a simple power-law model. The power law index of the time-averaged
spectrum is 2.55 +- 0.37. The fluence in the 15-150 keV band
is 3.1 +- 0.7 x 10^-7 erg/cm2. The 1-sec peak photon flux measured from
T+59.44 sec in the 15-150 keV band is 0.3 +- 0.2 ph/cm2/sec.
All the quoted errors are at the 90% confidence level.
The ground analysis shows an improved image significance
of 8.2 sigma in 15-350 keV. Also, the temporal and spectral
characteristics are consistent with those of a long GRB.
Therefore, the BAT ground analysis confirms that this is a GRB,
consistent with the conclusion reported in D'Elia et al., GCN Circ 28626.
The results of the batgrbproduct analysis are available at
http://gcn.gsfc.nasa.gov/notices_s/1000255/BA/
GCN Circular 28628
Subject
GRB 201014A (Swift trigger =1000255): CrAO/ZTSH optical afterglow discovery
Date
2020-10-15T12:53:30Z (5 years ago)
From
Alexei Pozanenko at IKI, Moscow <apozanen@iki.rssi.ru>
A. Pozanenko (IKI), N. Pankov (HSE), V. Rumyantsev (CrAO), S. Belkin
(IKI), A. Volnova (IKI) report on behalf of larger GRB follow-up
collaboration:
We observed the field of the GRB 201014A = (trigger=1000255) (Ambrosi et
al., GCN 28623) with ZTSH 2.6m telescope of CrAO observatory starting on
Oct. 14 (UT) 23:06:56, i.e. 18.3 minutes after burst detection. We
detect an object at the edge of enhanced XRT afterglow position (D���Elia
et al., GCN 28626). The coordinates of the object are (J2000) 01 23
11.058 +27 39 38.39 with uncertainty of 0.3 arcsec in each
coordinate.The object is absent in both SDSS DR12 and PS1 catalogues. We
suggest the object is an optical afterglow GRB 201014A.
Preliminary photometry of the object in a combined image is following
Date UT start t-T0 Filter Exp. OT err UL(3sigma)
(mid, days) (s)
2018-10-14 23:06:56 0.021967 R 11*120 21.50 0.15 22.6
The photometry is based on several nearby USNO-B1.0 stars.
GCN Circular 28626
Subject
Swift-BAT trigger 1000255: XRT afterglow detection of GRB 201014A
Date
2020-10-15T09:45:28Z (5 years ago)
From
Valerio D'Elia at ASDC <valerio.delia@ssdc.asi.it>
V. D���Elia (SSDC), E. Ambrosi, A. D���A�� (INAF-IASFPA) and P.A. Evans (U. Leicester)
report for the Swift-XRT team:
We have analysed 1.5 ks of XRT data for the Swift trigger 1000255 (Ambrosi et al. GCN Circ. 28623), from 156 s to 5.2 ks after the BAT trigger. The data are entirely in Photon Counting (PC) mode. We detect a bright (2.2E-1 cts/s), fading, uncatalogued X-ray source at the UVOT-enhanced position:
20.79619, 27.66024 which is equivalent to:
RA (J2000): 01 23 11.09
Dec (J2000): +27 39 36.9
with an uncertainty of 1.8 arcseconds (radius, 90% containment). This location is 3.3 arcminutes from the BAT onboard position, at the margin of the BAT error circle. This position was outside of the central window which is telemetered promptly, hence the source was not seen in the initial real-time analysis
Given that no catalogued X-ray sources are present within 5 arc minutes from the XRT position, we conclude that Swift-BAT trigger 1000255 is not due to noise but indeed is a GRB, and the reported source is the X-ray afterglow of GRB 201014A.
This is an official product of the Swift-XRT team.