GRB 201214A
GCN Circular 29036
Subject
GRB 201214A: Swift ToO observations
Date
2020-12-14T07:46:18Z (4 years ago)
From
Phil Evans at U of Leicester <pae9@leicester.ac.uk>
P. A. Evans (U. Leicester) reports on behalf of the Swift team:
Swift has initiated a ToO observation of the INTEGRAL GRB 201214A.
Automated analysis of the XRT data will be presented online at
https://www.swift.ac.uk/ToO_GRBs/00021406
Any uncatalogued X-ray sources detected in this analysis will be
reported on this website and via GCN COUNTERPART notices. These are
not necessarily related to the INTEGRAL event. Any X-ray source
considered to be a probable afterglow candidate will be reported via a
GCN Circular after manual consideration.
Details of the XRT automated analysis methods are detailed in Evans et
al. (2007, A&A, 469, 379; 2009, MNRAS, 397, 1177 and 2014, ApJS, 210, 8).
This circular is an official product of the Swift-XRT team.
GCN Circular 29037
Subject
GRB 201214A: A long GRB detected by INTEGRAL
Date
2020-12-14T08:10:16Z (4 years ago)
From
Sandro Mereghetti at IASF-Milano/INAF <sandro.mereghetti@inaf.it>
S.Mereghetti (INAF, IASF-Milano), D.Gotz (CEA, Saclay), C.Ferrigno,
E.Bozzo, V.Savchenko (ISDC, Versoix), L.Ducci (IAAT, Germany and ISDC,
Versoix) and J.Borkowski (CAMK, Torun) report:
a gamma ray burst lasting about 150 s has been detected by IBAS in the
IBIS/ISGRI
data at 6:18:20 UT of 14 December 2020.
The refined coordinates (J2000) are:
R.A. = 170.9361 deg
DEC. = +33.8725 deg
with an uncertainty of 2.5 arcmin (90% c.l.).
A preliminary analysis gives a peak flux of about 0.1 ph/cm2/s (20-200
keV, 1-s integration time) and a fluence in the same energy range of about
5e-7 erg/cm2.
A plot of the light curve will be posted at
http://ibas.iasf-milano.inaf.it/IBAS_Results.html
GCN Circular 29040
Subject
GRB 201214A: Mates' birthday GRB optical limit from FRAM-ORM
Date
2020-12-14T16:48:18Z (4 years ago)
From
Martin Jelinek at Astro.Inst-AVCR,Ondrejov <martin.jelinek@asu.cas.cz>
Martin Jelinek and Jan Strobl (ASU CAS Ondrejov, CZ),
Sergey Karpov, Martin Masek, Petr Janecek, Jakub Jurysek,
Jan Ebr, Ronan Cunniffe, Petr Travnicek and Michael Prouza
(Institute of Physics, Prague, CZ)
report:
The 25cm robotic telescope FRAM-ORM at La Palma (Spain) reacted robotically
to the INTEGRAL alert of GRB201214A (Mereghetti et al., GCNC 29037),
obtaining a series of 20s unfiltered images starting at 06:19:23.3 UT, i.e.
32.8s post trigger.
We do not detect any new or strongly variable source within a 20 arcmin FOV
around the reported gamma-ray errorbox - neither in single images
(detection limit R>~18.0) nor in a combined 40x20s frame (mean exp time
541s post trigger, with a limit R>~19.5).
GCN Circular 29048
Subject
GRB 201214A: Swift-XRT observations
Date
2020-12-15T07:17:06Z (4 years ago)
From
Aaron Tohuvavohu at U Toronto <aaron.tohu@gmail.com>
J.A. Kennea (PSU), A. Tohuvavohu (U. Toronto), J.P. Osborne (U.
Leicester), K.L. Page (U. Leicester), T. Sbarrato (INAF-OAB), P.
D'Avanzo (INAF-OAB), M.G. Bernardini (INAF-OAB), B. Sbarufatti (PSU)
and P.A. Evans (U. Leicester) report on behalf of the Swift-XRT team:
Swift-XRT has performed follow-up observations of the INTEGRAL-detected
burst GRB 201214A (Mereghetti et al. GCN Circ. 29037), collecting 4.1
ks of Photon Counting (PC) mode data between T0+5.2 ks and T0+23.6 ks.
One uncatalogued X-ray source has been detected consistent with being
within 246 arcsec of the INTEGRAL position, it is below the RASS limit
and shows no definitive signs of fading. Therefore, at the present time
we cannot confirm this as the afterglow. Details of this source are
given below:
Source 2:
RA (J2000.0): 170.92446 = 11:23:41.87
Dec (J2000.0): +33.86930 = +33:52:09.5
Error: 2.2 arcsec (radius, 90% conf. [Enhanced position])
Count-rate: 0.0182 +/- 0.0024 ct s^-1
Distance: 36 arcsec from INTEGRAL position.
Flux: (4.48 +/- 0.60)e-13 erg cm^-2 s^-1 (observed, 0.3-10 keV)
Three uncatalogued sources were also detected too far from the GRB
position to be likely afterglow candidates.
The results of the XRT-team automatic analysis of the XRT observations,
including a position-specific upper limit calculator, are available at
https://www.swift.ac.uk/ToO_GRBs/00021406.
This circular is an official product of the Swift-XRT team.
GCN Circular 29091
Subject
GRB 201214A: 1.3m DFOT, optical upper limits
Date
2020-12-19T18:14:24Z (4 years ago)
From
Amit Kumar at ARIES, India <amitkundu515@gmail.com>
Amit Kumar (ARIES), Rahul Gupta (ARIES), Neelam Panwar (ARIES), Dimple
(ARIES), Ankur Ghosh (ARIES), Avinash Singh (ARIES), Amar Aryan (ARIES),
Shashi B. Pandey (ARIES), and Kuntal Misra (ARIES) report:
We observed the field of INTEGRAL-detected burst GRB 201214A (Mereghetti et
al. GCN Circ. 29037; Evans et al., GCN 29036) with the 1.3m Devasthal Fast
Optical Telescope (DFOT) located at Devasthal observatory of Aryabhatta
Research Institute of Observational Sciences (ARIES), India. We observed a
series of images ~16.6 hours after the burst in both R and I (300sx3 in
each) filters (Johnson-Cousins) covering Swift XRT position (Kennea et al.,
GCN 29048). Preliminary photometry on the stacked images was performed and
calibrated against the USNO-B1 catalog stars. We do not detect any OT
candidate within the XRT position (see also Jelinek & Strobl GCN 29040).
The upper limits in the stacked images are the following:
DATE UT (start) Filter Exposure(sec) Frames Upper limit (mag)
2020-12-14 22:51:42 R 300 3 21.5
2020-12-14 23:27:40 I 300 3 21.0
This circular may be cited.
GCN Circular 29092
Subject
GRB 201214A: Swift-XRT afterglow detection
Date
2020-12-19T19:28:30Z (4 years ago)
From
Aaron Tohuvavohu at U Toronto <aaron.tohu@gmail.com>
J.A. Kennea (PSU), A. Tohuvavohu (U. Toronto), J.P. Osborne (U.
Leicester), K.L. Page (U. Leicester), T. Sbarrato (INAF-OAB), P.
D'Avanzo (INAF-OAB), M.G. Bernardini (INAF-OAB), B. Sbarufatti (PSU)
and P.A. Evans (U. Leicester) report on behalf of the Swift-XRT team:
Swift-XRT has conducted further observations of the field of the
INTEGRAL-detected burst GRB 201214A (Mereghetti et al. GCN Circ.
29037). The observations now extend from T0+5.3 ks to T0+378.1 ks. The
source previously reported by Kennea et al. (GCN Circ. 29048), "Source
2", is fading with 3-sigma significance, and is therefore likely the
GRB afterglow. Using 2671 s of PC mode data and 4 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 = 170.92446,
+33.86930 which is equivalent to:
RA (J2000): 11h 23m 41.87s
Dec(J2000): +33d 52' 09.5"
with an uncertainty of 2.2 arcsec (radius, 90% confidence). This
position is 36 arcsec from the INTEGRAL position. The source is fading
with alpha >0.6.
A spectrum formed from the PC mode data can be fitted with an absorbed
power-law with a photon spectral index of 2.7 (+0.9, -0.7). The
best-fitting absorption column is 1.9 (+2.2, -1.6) x 10^21 cm^-2, in
excess of the Galactic value of 2.4 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 2.6 x 10^-11 (2.6 x 10^-11) erg
cm^-2 count^-1.
A summary of the PC-mode spectrum is thus:
Total column: 1.9 (+2.2, -1.6) x 10^21 cm^-2
Galactic foreground: 2.4 x 10^20 cm^-2
Excess significance: 1.8 sigma
Photon index: 2.7 (+0.9, -0.7)
The results of the XRT-team automatic analysis of the likely afterglow
are at https://www.swift.ac.uk/ToO_GRBs/00021406/Source2.php.
The results of the full analysis of the XRT observations are available
at https://www.swift.ac.uk/ToO_GRBs/00021406.
This circular is an official product of the Swift-XRT team.
GCN Circular 29093
Subject
GRB 201214A: TSHAO optical upper limit
Date
2020-12-19T22:01:24Z (4 years ago)
From
Alexei Pozanenko at IKI, Moscow <apozanen@iki.rssi.ru>
S. Belkin (IKI), N. Pankov (HSE), I. Reva (FAPHI), V. Kim (FAPHI), A.
Pozanenko (IKI) report on behalf of GRB IKI FuN:
We observed the field of GRB 201214A (Mereghetti et al., GCN 29037)
with Zeiss-1000 1-m telescope of Tien Shan Astronomical Observatory
starting on Dec. 14 (UT) 18:15:39. We did not find any source in the
enhanced XRT position of an afterglow (Kennea et al., GCN 29092), see
also (Jelinek et. al GCN 29040; Kumar et. al GCN 29091). Preliminary
photometry of the filed is following.
Date UT start t-T0 Filter Exp. OT Err. UL(3 sigma)
(mid, days) (s)
2020-12-14 18:15:39 0.50959 R 22*90 n/d n/d 21.1
The photometry is based on nearby USNO-B1.0 stars.