GRB 210112A
GCN Circular 29289
Subject
GRB 210112A: Swift detection of a burst with an optical counterpart
Date
2021-01-12T01:51:00Z (4 years ago)
From
David Palmer at LANL <palmer@lanl.gov>
E. Ambrosi (INAF-IASFPA), S. D. Barthelmy (GSFC),
A. D'Ai (INAF-IASFPA), V. D'Elia (SSDC), J. A. Kennea (PSU),
N. J. Klingler (PSU), S. Laha (GSFC/UMBC/CRESST),
A. Y. Lien (GSFC/UMBC), F. E. Marshall (NASA/GSFC),
D. M. Palmer (LANL) and M. H. Siegel (PSU) report on behalf of the
Neil Gehrels Swift Observatory Team:
At 01:37:03 UT, the Swift Burst Alert Telescope (BAT) triggered and
located GRB 210112A (trigger=1016881). Swift slewed immediately to the burst.
The BAT on-board calculated location is
RA, Dec 218.999, +33.070 which is
RA(J2000) = 14h 36m 00s
Dec(J2000) = +33d 04' 13"
with an uncertainty of 3 arcmin (radius, 90% containment, including
systematic uncertainty). The BAT light curve shows multiple peaks
with the larger peak at T+70 sec and duration of ~150 sec. The peak count rate
was ~20800 counts/sec (15-350 keV), at ~68 sec after the trigger.
The XRT began observing the field at 01:38:18.0 UT, 74.2 seconds after
the BAT trigger. XRT found a bright, uncatalogued X-ray source located
at RA, Dec 219.0044, 33.0566 which is equivalent to:
RA(J2000) = 14h 36m 1.06s
Dec(J2000) = +33d 03' 23.8"
with an uncertainty of 5.0 arcseconds (radius, 90% containment). This
location is 50 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 0.1 s image was 7.10e-08 erg cm^-2 s^-1 (0.2-10
keV).
UVOT took a finding chart exposure of 150 seconds with the White filter
starting 82 seconds after the BAT trigger. There is a candidate afterglow in
the rapidly available 2.7'x2.7' sub-image at
RA(J2000) = 14:36:01.45 = 219.00606
DEC(J2000) = +33:03:15.4 = 33.05428
with a 90%-confidence error radius of about 0.66 arc sec. This position is 9.8
arc sec. from the center of the XRT error circle. The estimated magnitude is
19.52 with a 1-sigma error of about 0.16. No correction has been made for the
expected extinction corresponding to E(B-V) of 0.014.
Burst Advocate for this burst is E. Ambrosi (elena.ambrosi AT inaf.it).
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/)
GCN Circular 29290
Subject
GRB 210112A: Enhanced Swift-XRT position
Date
2021-01-12T04:17:47Z (4 years ago)
From
Phil Evans at U of Leicester <pae9@leicester.ac.uk>
M.R. Goad, J.P. Osborne, A.P. Beardmore and P.A. Evans (U. Leicester)
report on behalf of the Swift-XRT team.
Using 579 s of XRT Photon Counting mode data and 1 UVOT
images for GRB 210112A, 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 = 219.00603, +33.05415 which is equivalent
to:
RA (J2000): 14h 36m 1.45s
Dec (J2000): +33d 03' 15.0"
with an uncertainty of 1.7 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 Circular 29292
Subject
GRB 210112A: Kitab a optical upper limit
Date
2021-01-12T11:19:27Z (4 years ago)
From
Alexei Pozanenko at IKI, Moscow <apozanen@iki.rssi.ru>
A. Novichonok (Petrozavodsk State University, KIAM), S. Belkin (IKI),
A. Pozanenko (IKI), Sh. Ehgamberdiev (UBAI) report on behalf of GRB IKI FuN:
We observed the field of GRB 210112A (Ambrosi et al., GCN 29289) with
Kitab-ISON RC-36 telescope starting on 2021-01-12 (UT) 01:54:30, i.e.
447 seconds after trigger in Clear filter. We do not detect the
afterglow candidate (Ambrosi et al., GCN 29289) within enhanced
Swift-XRT position (Goad et al., GCN 29290).
Preliminary photometry of the field is following
Date, UT start, t-T0, Exp., Filter, OT, Err., UL
(mid, days)
2021-01-12 01:54:30 0.01541 11*30 CR n/d n/d 18.5
The photometry is based on nearby USNO-B1.0 stars
USNO-B1.0_id R2
1231-0260671 14:35:00.70080 +33:06:09.4428 14.32
1229-0281658 14:34:57.67344 +32:58:13.0800 14.75
At 01:37:03 UT
GCN Circular 29293
Subject
GRB 210112A: AGILE detection
Date
2021-01-12T12:30:09Z (4 years ago)
From
Alessandro Ursi at INAF/IAPS <alessandro.ursi@gmail.com>
A. Ursi, M. Cardillo (INAF/IAPS), C. Pittori (SSDC, and INAF/OAR), M.
Tavani (INAF/IAPS, and Univ. Roma Tor Vergata), A. Argan, C. Casentini, Y.
Evangelista, G. Piano (INAF/IAPS), F. Lucarelli, F. Verrecchia (SSDC, and
INAF/OAR), A. Bulgarelli, V. Fioretti, F. Fuschino, N. Parmiggiani
(INAF/OAS-Bologna), M. Marisaldi (INAF/OAS-Bologna, and Bergen University),
M. Pilia, A. Trois (INAF/OA-Cagliari), I. Donnarumma (ASI), F. Longo (Univ.
Trieste and INFN Trieste), A. Giuliani (INAF/IASF-Mi), report on behalf of
the AGILE Team:
The AGILE satellite detected GRB 210112A, reported by Swift (GCNs #29289,
#29290), at T0 = 2021-01-12 01:37:58 (UT).
The event is clearly visible in the scientific ratemeters of the SuperAGILE
(SA; 18-60 keV), MiniCALorimeter (MCAL; 0.4-100 MeV), and AntiCoincidence
(AC; 50-200 keV) detectors. The burst lasted about 25 s and released 1120
counts in the SA detector (above a background rate of 60 Hz), 25140 counts
in the MCAL detector (above a background rate of 1250 Hz), and 71500 counts
in the AC detector (above a background rate of 3570 Hz). The AGILE
ratemeters light curves can be found at:
http://www.agilescienceapp.it/notices/GRB210112A_AGILE_RM.png .
Additional analysis of AGILE data is in progress.
GCN Circular 29295
Subject
GRB 210112A: Swift-XRT refined Analysis
Date
2021-01-12T17:20:18Z (4 years ago)
From
Phil Evans at U of Leicester <pae9@leicester.ac.uk>
P.A. Evans (U. Leicester), J.P. Osborne (U. Leicester), M. Capalbi
(INAF-IASFPA), M. Perri (SSDC & INAF-OAR), B. Sbarufatti (PSU), D.N.
Burrows (PSU), J. D. Gropp (PSU), K.L. Page (U. Leicester) and E.
Ambrosi report on behalf of the Swift-XRT team:
We have analysed 8.5 ks of XRT data for GRB 210112A (Ambrosi et al. GCN
Circ. 29289