GRB 200122A
GCN Circular 26844
Subject
GRB 200122A: Swift detection of a burst
Date
2020-01-22T02:08:43Z (5 years ago)
From
David Palmer at LANL <palmer@lanl.gov>
E. Sonbas (Adiyaman Univ.), C. Gronwall (PSU), J.D. Gropp (PSU),
J. A. Kennea (PSU), N. J. Klingler (PSU), F. E. Marshall (NASA/GSFC),
M. J. Moss (GWU), K. L. Page (U Leicester), D. M. Palmer (LANL),
M. H. Siegel (PSU) and A. Tohuvavohu (U Toronto) report on behalf of
the Neil Gehrels Swift Observatory Team:
At 01:41:00 UT, the Swift Burst Alert Telescope (BAT) triggered and
located GRB 200122A (trigger=950330). Swift slewed immediately to the burst.
The BAT on-board calculated location is
RA, Dec 209.981, +27.566 which is
RA(J2000) = 13h 59m 55s
Dec(J2000) = +27d 33' 56"
with an uncertainty of 3 arcmin (radius, 90% containment, including
systematic uncertainty). The BAT light curve showed a complex
structure with a duration of about 50 sec. The peak count rate
was ~11000 counts/sec (15-350 keV), at ~10 sec after the trigger.
The XRT began observing the field at 01:42:12.5 UT, 72.2 seconds after
the BAT trigger. Using promptly downlinked data we find a bright,
uncatalogued X-ray source located at RA, Dec 210.01625, 27.54988 which
is equivalent to:
RA(J2000) = 14h 00m 03.90s
Dec(J2000) = +27d 32' 59.6"
with an uncertainty of 3.5 arcseconds (radius, 90% containment). This
location is 126 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
https://www.swift.ac.uk/sper.
A power-law fit to a spectrum formed from promptly downlinked event
data gives a column density in excess of the Galactic value (1.54 x
10^20 cm^-2, Willingale et al. 2013), with an excess column of 1
(+0.55/-0.45) x 10^22 cm^-2 (90% confidence).
The initial flux in the 2.5 s image was 9.13e-10 erg cm^-2 s^-1 (0.2-10
keV).
UVOT took a finding chart exposure of 150 seconds with the White filter
starting 81 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
0.03.
Burst Advocate for this burst is E. Sonbas (edasonbas AT yahoo.com).
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 26845
Subject
Swift GRB 200122A: Global MASTER-Net observations report
Date
2020-01-22T04:18:40Z (5 years ago)
From
Vladimir Lipunov at Moscow State U/Krylov Obs <lipunov@xray.sai.msu.ru>
V. Lipunov, E. Gorbovskoy, V.Kornilov, N.Tyurina, P.Balanutsa, A.Kuznetsov, F.Balakin,
V.Vladimirov, D. Vlasenko, I.Gorbunov, D.Zimnukhov, V.Senik, T.Pogrosheva,
D.Kuvshinov, D. Cheryasov
(Lomonosov Moscow State University, SAI, Physics Department),
R. Podesta, C.Lopez, F. Podesta, C.Francile
(Observatorio Astronomico Felix Aguilar OAFA),
H.Levato
(Instituto de Ciencias Astronomicas, de la Tierra y del Espacio ICATE),
R. Rebolo, M. Serra
(The Instituto de Astrofisica de Canarias),
D. Buckley
(South African Astronomical Observatory),
O.A. Gres, N.M. Budnev, O.Ershova
(Irkutsk State University, API),
A. Tlatov, D. Dormidontov
(Kislovodsk Solar Station of the Pulkovo Observatory),
V. Yurkov, A. Gabovich, Yu. Sergienko
(Blagoveschensk Educational State University)
MASTER-IAC robotic telescope (Global MASTER-Net: http://observ.pereplet.ru, Lipunov et al., 2010, Advances in Astronomy, vol. 2010, 30L) located in Spain (IAC Teide Observatory) was pointed to the Swift GRB 200122A ( E. Sonbas et al., GCN 26844) errorbox 8770 sec after trigger time at 2020-01-22 04:07:10 UT, with upper limit up to 19.4 mag. The observations began at zenith distance = 38 deg. The sun altitude is -49.9 deg.
The galactic latitude b = 74 deg., longitude l = 38 deg.
Real time updated cover map and OT discovered available here:
https://master.sai.msu.ru/site/master2/observ.php?id=1266128
We obtain a following upper limits.
Tmid-T0 | Site |Filt.| Expt. | Limit| Comment
_________|_____________________|_____|_______|______|________
8860 | MASTER-IAC | C | 180 | 19.4 |
8860 | MASTER-IAC | C | 180 | 19.2 |
Filter C is a clear (unfiltred) band.
The observation and reduction will continue.
The message may be cited.
GCN Circular 26846
Subject
GRB 200122A: Enhanced Swift-XRT position
Date
2020-01-22T04:59:55Z (5 years ago)
From
Phil Evans at U of Leicester <pae9@leicester.ac.uk>
J.P. Osborne, A.P. Beardmore, P.A. Evans and M.R. Goad (U. Leicester)
report on behalf of the Swift-XRT team.
Using 1627 s of XRT Photon Counting mode data and 1 UVOT
images for GRB 200122A, 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 = 210.01807, +27.54884 which is equivalent
to:
RA (J2000): 14h 00m 4.34s
Dec (J2000): +27d 32' 55.8"
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 26852
Subject
GRB 200122A: Swift-XRT refined Analysis
Date
2020-01-22T13:20:52Z (5 years ago)
From
Phil Evans at U of Leicester <pae9@leicester.ac.uk>
J. D. Gropp (PSU), A. Tohuvavohu (U. Toronto), J.A. Kennea (PSU), P.A.
Evans (U. Leicester), J.P. Osborne (U. Leicester), K.L. Page (U.
Leicester), A. D'Ai (INAF-IASFPA), A. Melandri (INAF-OAB), P. D'Avanzo
(INAF-OAB) and E. Sonbas report on behalf of the Swift-XRT team:
We have analysed 6.4 ks of XRT data for GRB 200122A (Sonbas et al. GCN
Circ. 26844), from 63 s to 35.2 ks after the BAT trigger. The data
comprise 296 s in Windowed Timing (WT) mode (the first 8 s were taken
while Swift was slewing) with the remainder in Photon Counting (PC)
mode. The enhanced XRT position for this burst was given by Osborne et
al. (GCN Circ. 26846).
The late-time light curve (from T0+5.3 ks) can be modelled with a
power-law decay with a decay index of alpha=0.67 (+0.11, -0.10).
A spectrum formed from the WT mode data can be fitted with an absorbed
power-law with a photon spectral index of 1.84 (+/-0.05). The
best-fitting absorption column is 1.44 (+/-0.07) x 10^22 cm^-2, in
excess of the Galactic value of 1.5 x 10^20 cm^-2 (Willingale et al.
2013). The PC mode spectrum has a photon index of 2.25 (+/-0.14) and a
best-fitting absorption column of 1.70 (+0.18, -0.17) x 10^22 cm^-2.
The counts to observed (unabsorbed) 0.3-10 keV flux conversion factor
deduced from this spectrum is 5.1 x 10^-11 (1.3 x 10^-10) erg cm^-2
count^-1.
A summary of the PC-mode spectrum is thus:
Total column: 1.70 (+0.18, -0.17) x 10^22 cm^-2
Galactic foreground: 1.5 x 10^20 cm^-2
Excess significance: 16.2 sigma
Photon index: 2.25 (+/-0.14)
If the light curve continues to decay with a power-law decay index of
0.67, the count rate at T+24 hours will be 0.11 count s^-1,
corresponding to an observed (unabsorbed) 0.3-10 keV flux of 5.7 x
10^-12 (1.5 x 10^-11) erg cm^-2 s^-1.
The results of the XRT-team automatic analysis are available at
http://www.swift.ac.uk/xrt_products/00950330.
This circular is an official product of the Swift-XRT team.
GCN Circular 26853
Subject
GRB 200122A: GOTO non-detection of optical afterglow
Date
2020-01-22T13:31:25Z (5 years ago)
From
Joe Lyman at U of Warwick <j.d.lyman@warwick.ac.uk>
K.Wiersema (1); D.Steeghs (1); K.Ulaczyk (1); J.Lyman (1); R.Cutter
(1); T.Killestein (1); M.Dyer (3); M.Kennedy (10); G.Ramsay (5);
D.K.Galloway (2); V.Dhillon (3); P.O���Brien (4); D.Pollacco (1);
E.Thrane (2); S.Poshyachinda (6); S.Mattila (7); L.Nuttall (8);
E.Palle (9); A.Levan (1); T.Marsh (1); R.West (1); E.Stanway (1);
B.Gompertz (1); J.McCormac (1); P.Strom (1); K.Ackley (2);
Y.-L.Mong (2); A.Casey (2); M.Brown (2); B.Muller (2);
J.Mullaney (3); E.Daw (3); S.Littlefair (3); J.Maund (3);
L.Makrygianni (3); R.Starling (4); R.Eyles (4); S.Tooke (4);
S.Aukkaravittayapun (6); U.Sawangwit (6); S.Awiphan (6);
D.Mkrtichian (6); P.Irawati (6); R.Kotak (7); T.Heikkila (7); E.Rol
(2)
(1) Warwick University, (2) Monash University, (3) University of
Sheffield, (4) University of Leicester, (5) Armagh Observatory &
Planetarium, (6) National Astronomical Research Institute of
Thailand, (7) University of Turku, (8) University of Portsmouth, (9)
Instituto de Astrofisica de Canarias), (10) Univ. of Manchester.
report on behalf of the GOTO collaboration:
We carried out observations with the Gravitational-wave Optical
Transient Observer (GOTO), in response to GRB 200122A
(Sonbas et al. 2020; GCN #26844).
We made a series of 3 x 60 s exposures using our wide L-band filter
(400-700 nm) covering the Swift XRT position RA, Dec = 210.01807,
+27.54884 (Osborne et al. 2020; GCN #26846), with midtime 02:35:49
UT on 22 January 2020 (3289 seconds after trigger).
Using a difference imaging analysis with recent survey observations
of the same pointings as reference, we identify no viable
afterglow candidate. Our 5-sigma detection limit was g=19.5 mag
based on PS1 catalogue calibrators.
GOTO is operated at the La Palma observing facilities of the
University of Warwick on behalf of a consortium including the
University of Warwick, Monash University, Armagh Observatory, the
University of Leicester, the University of Sheffield, the National
Astronomical Research Institute of Thailand (NARIT) and the Instituto
de Astrofisica de Canarias (IAC) (https://goto-observatory.org)
GCN Circular 26854
Subject
GRB 200122A: FRAM-ORM optical limit
Date
2020-01-22T15:58:16Z (5 years ago)
From
Martin Jelinek at Astro.Inst-AVCR,Ondrejov <martin.jelinek@asu.cas.cz>
Martin Jelinek, Jan Strobl (ASU CAS Ondrejov, CZ),
Martin Masek, Petr Janecek, Sergey Karpov, 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 alert of GRB200122A (Sonbas et
al, GCNC 26844), obtaining a series of 20s unfiltered images
starting at 01:41:33.0UT, i.e. 32.6s post trigger.
We do not detect any new source in comparison to USNO-B2.0
catalog neither in single images (3-sigma limit R>~17.4)
nor in a combined 40x20s frame (mean exp time 551s post
trigger, 3-sigma limit R>~19.3).
GCN Circular 26859
Subject
GRB 200122A: Swift/UVOT Upper Limits
Date
2020-01-22T23:29:02Z (5 years ago)
From
Mike Siegel at PSU/Swift MOC <mhs18@psu.edu>
A. Belles (PSU) and E. Sonbas (Adiyaman Univ.)
report on behalf of the Swift/UVOT team:
The Swift/UVOT began settled observations of the field of GRB 200122A
82 s after the BAT trigger (Sonbas et al., GCN Circ. 26844).
No optical afterglow consistent with the XRT position
(Osborne et al. GCN Circ. 26846)
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 82 232 147 >21.1
u_fc 294 544 246 >20.9
white 82 5672 627 >21.7
v 624 6083 352 >19.4
b 550 5467 333 >20.6
u 294 1844 363 >20.7
w1 674 1472 58 >20.1
m2 6088 6276 186 >19.5
w2 5678 5878 197 >20.3
The magnitudes in the table are not corrected for the Galactic extinction
due to the reddening of E(B-V) = 0.03 in the direction of the burst
(Schlegel et al. 1998).
GCN Circular 26860
Subject
GRB 200122A: Xinglong-2.16m optical upper limit
Date
2020-01-23T01:24:01Z (5 years ago)
From
Dong Xu at NAOC/CAS <dxu@nao.cas.cn>
X. Liu, D. Xu, H.J. Wang, Z.P. Zhu, B.Y. Yu (NAOC) report:
We observed the field of GRB 200122A (Sonbas et al., GCN 26844) using
the Xinglong-2.16m telescope equipped with the BFOSC camera.
Observations started at 22:14:52 UT on 2020-01-22 (i.e., 20.57 h after
the BAT trigger), and 5x200 s R-band frames have been obtained.
No optical afterglow is detected at the Swift XRT's position in our
stacked image, down to a limiting magnitude of m(R) ~ 22.0, calibrated
with the nearby PanSTARRS field.
GCN Circular 26861
Subject
GRB 200122A: Swift-BAT refined analysis
Date
2020-01-23T02:01:53Z (5 years ago)
From
Amy Lien at GSFC <amy.y.lien@nasa.gov>
A. Y. Lien (GSFC/UMBC), 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),
E. Sonbas (Adiyaman Univ.), M. Stamatikos (OSU),
T. N. Ukwatta (LANL) (i.e. the Swift-BAT team):
Using the data set from T-240 to T+302 sec from the recent telemetry
downlink,
we report further analysis of BAT GRB 200122A (trigger #950330)
(Sonbas et al., GCN Circ. 26844). The BAT ground-calculated position is
RA, Dec = 210.010, 27.548 deg which is
RA(J2000) = 14h 00m 02.4s
Dec(J2000) = +27d 32' 52.2"
with an uncertainty of 1.0 arcmin, (radius, sys+stat, 90% containment).
The partial coding was 78%.
The mask-weighted light curve shows a multi-peaked structure that starts
from ~T-10 s and ends at ~T+200 s. The main emission interval is
around T-10 s to T+50 s, with the highest peak occurs at ~T+10 s.
In addition, there is a weak pulse around ~T+192 s.
T90 (15-350 keV) is 174.96 +- 14.54 sec (estimated error including
systematics).
The time-averaged spectrum from T-8.572 to T+201.832 sec is best
fit by a simple power-law model. The power law index of the
time-averaged spectrum is 1.60 +- 0.05. The fluence in the 15-150 keV
band is 1.1 +- 0.03 x 10^-5 erg/cm2. The 1-sec peak photon flux measured
from T+10.18 sec in the 15-150 keV band is 9.1 +- 0.4 ph/cm2/sec.
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/950330/BA/
GCN Circular 26862
Subject
GRB 200122A: RATIR Optical Observations
Date
2020-01-23T04:14:06Z (5 years ago)
From
Alan M Watson at UNAM <alan@astro.unam.mx>
Alan M. Watson (UNAM), Nat Butler (ASU), Alexander Kutyrev (GSFC),
William H. Lee (UNAM), Michael G. Richer (UNAM), Ori Fox (STScI), J.
Xavier Prochaska (UCSC), Josh Bloom (UCB), Antonino Cucchiara (UVI),
Eleonora Troja (GSFC), Owen Littlejohns (ASU), Enrico Ramirez-Ruiz
(UCSC), Jes��s Gonz��lez (UNAM), Carlos Rom��n-Z����iga (UNAM), Harvey
Moseley (GSFC), John Capone (UMD), V. Zach Golkhou (U. Wash.), and Vicki
Toy (UMD) report:
We observed the field of GRB 200122A (Sonbas et al., GCN Circ. 26844)
with the Reionization and Transients Infrared Camera (RATIR;
www.ratir.org) on the 1.5m Harold Johnson Telescope at the Observatorio
Astron��mico Nacional on Sierra San Pedro M��rtir from 2020/01 22.35 to
2020/01 22.56 UTC (6.67 to 11.76 hours after the BAT trigger), obtaining
a total of 3.76 hours exposure in the r and i bands.
For a source within the Swift-XRT enhanced error circle (Osborne et al.,
GCN Circ. 26846), in comparison with the SDSS DR9 and 2MASS catalogs, we
obtain the following 3-sigma upper limits:
r > 23.72
i > 23.42
These magnitudes are in the AB system and are not corrected for Galactic
extinction in the direction of the GRB.
We thank the staff of the Observatorio Astron��mico Nacional in San Pedro
M��rtir.
GCN Circular 26864
Subject
GRB 200122A: MITSuME Akeno optical upper limits
Date
2020-01-23T06:48:06Z (5 years ago)
From
Adachi Ryo at Tokyo Institute of Tech <adachi@hp.phys.titech.ac.jp>
R. Adachi, K. L. Murata, M. Niwano, F. Ogawa, R. Hosokawa, N.
Nakamura, S. Toma, M. Oeda, K. Shiraishi, K. Iida, Y. Yatsu, and N.
Kawai(TokyoTech) report on behalf of the MITSuME collaboration:
We searched for the optical counterpart of GRB 200122A (E. Sonbas et
al.,GCN Circular #26844) with the optical three color (g', Rc, and Ic)
CCD cameras attached to the MITSuME 50 cm telescope of Akeno
Observatory, Yamanashi, Japan.
The observation started on 14:39:41 UT. Then the observation stopped
due to the bad weather and started again at 16:20:20 UT. We did not
find any new point sources within the Swift-XRT error circle (J.P.
Osborne et al., GCN Circular #26846) in all three bands.
We obtained the 5-sigma limits as follows.
T0+[hour] MID-UT T-EXP[sec] 5-sigma limits
------------------------------------------------------------------------------------------------
14.66 17:41:47 7140 g'>18.6,Rc>18.8,Ic>18.1
------------------------------------------------------------------------------------------------
T0+ : Elapsed time after the burst
T-EXP: Total Exposure time
We used Pan-STARRS DR1 catalog for flux calibration.
The magnitudes are expressed in the AB system.
The images were processed in real-time through the MITSuME GPU
reduction pipeline (Niwano et al. ,in prep;
https://github.com/MNiwano/Eclair)
GCN Circular 26865
Subject
Konus-Wind observation of GRB 200122A
Date
2020-01-23T12:24:17Z (5 years ago)
From
Dmitry Frederiks at Ioffe Institute <fred@mail.ioffe.ru>
D. Frederiks, S. Golenetskii, R.Aptekar, A.Lysenko,
A. Ridnaia, D. Svinkin, A. Tsvetkova, M. Ulanov, and T. Cline,
on behalf of the Konus-Wind team, report:
The long GRB 200122A (Swift detection: Sonbas et al., GCN 26844)
triggered Konus-Wind (KW) at T0=6066.859 s UT (01:41:06.859).
The burst light curve shows a multi-peaked structure
in the interval from ~T0-12 s to ~T0+26 s.
The total duration of the burst is ~40 s.
The emission is seen up to ~10 MeV.
The Konus-Wind light curve of this GRB is available at
http://www.ioffe.ru/LEA/GRBs/GRB200122_T06066/
As observed by Konus-Wind, the burst had
a fluence of (2.0 �� 0.3)x10^-5 erg/cm^2 and
a 64-ms peak energy flux, measured from T0+6.080,
of (5.7 �� 0.7)x10^-6 erg/cm^2/s (both in the 20 keV - 10 MeV energy range).
The time-integrated spectrum (measured from T0 to T0+24.832 s)
is best fit in the 20 keV - 20 MeV range
by the GRB (Band) function with the following model parameters:
the low-energy photon index alpha = -1.00 (-0.13,+0.16),
the high energy photon index beta = -2.81 (-0.94,+0.32),
the peak energy Ep = 148 (-16,+15) keV,
chi2 = 83/96 dof.
The spectrum near the peak count rate (measured from T0
to T0+8.448 s) is best fit in the 20 keV - 15 MeV range
by the GRB (Band) function with the following model parameters:
the low-energy photon index alpha = -0.88 (-0.16,+0.19),
the high energy photon index beta = -2.37 (-0.39,+0.16),
the peak energy Ep = 168 (-22,+31) keV,
chi2 = 83/96 dof.
All the quoted errors are estimated at the 68% confidence level.
All the presented results are preliminary.
GCN Circular 26869
Subject
GRB 200122A: Mondy optical upper limit
Date
2020-01-24T13:19:45Z (5 years ago)
From
Alexei Pozanenko at IKI, Moscow <apozanen@iki.rssi.ru>
S. Belkin (IKI), A. Pozanenko (IKI), E. Klunko (ISTP), E. Mazaeva
(IKI), A. Volnova (IKI) report on behalf of IKI-GRB-FuN:
We observed the field of GRB 200122A (Sonbas et al. GCN 26844) with
AZT-33IK telescope of Sayan observatory (Mondy) starting on Jan. 22 (UT)
20:23:25. We do not detect any optical object in the Enhanced
Swift-XRT position (Osborne et al. GCN 26846). Preliminary photometry
of the field is following.
Date UT start t-T0 Filter Exp. OT UL(3sigma)
(mid, days) (s)
2020-01-22 20:23:25 0.79876 R 30*120 n/d 23.3
Photometry is based on the USNO-B2.0 nearby stars
USNO-B1.0_id R2
1175-0271901 16.74
1174-0271881 19.69
GCN Circular 26870
Subject
GRB 200122A: Optical upper limit
Date
2020-01-24T14:50:35Z (5 years ago)
From
Dimple Panchal at ARIES, India <dimple@aries.res.in>
Dimple, R. Gupta, V.K. Jha, A. Aryan, A. Ghosh, K. Misra, A. Kumar, and S.B. Pandey report:
We carried out observation of GRB 200122A (Sonbas et al., GCN Circ. 26844) with the 1.3m Devasthal Fast Optical Telescope (DFOT) at Devasthal observatory of Aryabhatta Research Institute of observational sciencES (ARIES), India.
The observation was started on 2020-01-23 at 10:29:41 UT. We observed a series of 3 x 300s exposures using R filter (Johnson-Cousins) covering Swift XRT enhanced position RA, Dec = 210.01807,+2754884 (Osborne et al., GCN Circ. 26846).
We do not detect any new optical source within the Swift XRT enhanced error circle neither in single images nor in the combined image.
We obtained the 3-sigma upper limit as follows
T_start-T0 (hours) Start_UT End_UT Filter 3-sigma upper limit
-------------------------------------------------------------------------------------------------
8.8 10:29:41 10:44:41 R >21.13
-------------------------------------------------------------------------------------------------
Photometry is done based on USNO-B1.0 catalog. This magnitude is not corrected for Galactic extinction in the direction of the GRB.
GCN Circular 26871
Subject
GRB 200122A: AstroSat CZTI detection
Date
2020-01-24T14:51:04Z (5 years ago)
From
Ramkrishna Gaikwad at IUCAA/AstroSat <ramkrishna@iucaa.in>
R. Gaikwad, S. Gupta, V. Sharma and D. Bhattacharya (IUCAA), V. Bhalerao (IIT-B), A. R. Rao (TIFR) and S. Vadawale (PRL) report on behalf of the AstroSat CZTI collaboration:
Analysis of AstroSat CZTI data showed the detection of a long GRB 200122A, which was also detected by Swift (Sonbas E. et al., GCN #26844), Global MASTER-Net (Lipunov V. et al., GCN #26845), Swift-XRT (Osborne J. et al., GCN #26846), GOTO (Wiersema K. et al., GCN #26853), Swift/UVOT (Belles A. et al., GCN #26859), Xinglong-2.16m (Liu X. et al., GCN #26860), RATIR (Watson A. et al., GCN #26862), MITSuME Akeno ( Adachi R. et al., GCN #26864) and Konus-Wind (Frederiks D. et al., GCN #26864).
The source was clearly detected in the 40-200 keV energy range. The light curve showed multiple peak of emissions with the strongest peak at 2020-01-22 01:41:00.0 UT. The measured peak count rate associated with the burst is 74 cts/s above the background in the combined data of four quadrants, with a total of 5463 cts. The local mean background count rate was 664 cts/s. Using cumulative rates, we measure a T90 of 39.3 s.
It was also clearly detected in the CsI anticoincidence (Veto) detector in the 100-500 keV energy range.
CZTI GRB detections are reported regularly on the payload site at http://astrosat.iucaa.in/czti/?q=grb. CZTI is built by a TIFR-led consortium of institutes across India, including VSSC, ISAC, IUCAA, SAC and PRL. The Indian Space Research Organisation funded, managed and facilitated the project.
GCN Circular 26873
Subject
GRB 200122A: Optical upper limit: correction to the GCN circ. 26870
Date
2020-01-24T18:07:16Z (5 years ago)
From
Dimple Panchal at ARIES, India <dimple@aries.res.in>
Dimple, R. Gupta, V. K. Jha, A. Aryan, A. Ghosh, K. Misra, A. Kumar, and S. B. Pandey report:
We carried out observation of GRB 200122A (Sonbas et al., GCN Circ. 26844) with the 1.3m Devasthal Fast Optical Telescope (DFOT) at the Devasthal observatory of Aryabhatta Research Institute of observational sciencES (ARIES), India.
The observation was started on 2020-01-22 at 23:34:50 UTC. We observed a series of 3 x 300s exposures using R filter (Johnson-Cousins) covering Swift XRT enhanced position RA, Dec = 210.01807, +27.54884 (Osborne et al., GCN Circ. 26846).
We do not detect any new optical source within the Swift XRT enhanced error circle neither in single image nor in the combined image.
We obtained the 3-sigma upper limit as follows
T_start-T0 (hours) Start_UTC End_UTC Filter 3-sigma upper limit
-------------------------------------------------------------------------------------------------------
21.9 23:34:50 23:49:50 R >21.13
-------------------------------------------------------------------------------------------------------
Photometry is done based on USNO-B1.0 catalog. This magnitude is not corrected for Galactic extinction in the direction of the GRB.