GRB 220117B
GCN Circular 31468
Subject
GRB 220117B: Swift detection of a burst
Date
2022-01-17T20:18:29Z (3 years ago)
From
David Palmer at LANL <palmer@lanl.gov>
A. Melandri (INAF-OAB), M. G. Bernardini (INAF-OAB), J.D. Gropp (PSU),
N. J. Klingler (GSFC/UMBC/CRESSTII), A. Y. Lien (U Tampa),
F. E. Marshall (NASA/GSFC), D. M. Palmer (LANL),
T. M. Parsotan (GSFC/UMBC/CRESSTII), T. Sbarrato (INAF-OAB) and
M. H. Siegel (PSU) report on behalf of the Neil Gehrels Swift
Observatory Team:
At 20:05:28 UT, the Swift Burst Alert Telescope (BAT) triggered and
located GRB 220117B (trigger=1093611). Swift slewed immediately to the burst.
The BAT on-board calculated location is
RA, Dec 191.947, -28.744 which is
RA(J2000) = 12h 47m 47s
Dec(J2000) = -28d 44' 38"
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 20 sec. The peak count rate
was ~1000 counts/sec (15-350 keV), at ~1 sec after the trigger.
The XRT began observing the field at 20:07:04.0 UT, 95.9 seconds after
the BAT trigger. XRT found a bright, uncatalogued X-ray source located
at RA, Dec 191.9514, -28.7446 which is equivalent to:
RA(J2000) = 12h 47m 48.34s
Dec(J2000) = -28d 44' 40.6"
with an uncertainty of 6.5 arcseconds (radius, 90% containment). This
location is 14 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 4.69e-10 erg cm^-2 s^-1 (0.2-10
keV).
UVOT took a finding chart exposure of nominal 150.000 seconds with the White
filter starting 104 seconds after the BAT trigger. No credible afterglow
candidate has been found in the initial data products. Data from the 2.7'x2.7'
sub-image are not available at this time. 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 0.075.
Burst Advocate for this burst is A. Melandri (andrea.melandri AT brera.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 31469
Subject
Swift GRB 220117B: Global MASTER-Net observations report
Date
2022-01-17T20:24:34Z (3 years ago)
From
Vladimir Lipunov at Moscow State U/Krylov Obs <lipunov@xray.sai.msu.ru>
V. Lipunov, V.Kornilov, E.Gorbovskoy, K.Zhirkov, N.Tyurina, P.Balanutsa, A.Kuznetsov,
D. Vlasenko, G.Antipov, D.Zimnukhov, V.Senik, T.Pogrosheva, E.Minkina,
A.Chasovnikov, V.Topolev, V.Grinshpun, D.Kuvshinov, D. Cheryasov
(Lomonosov Moscow State University, SAI, Physics Department),
R. Podesta, C.Lopez, F. Podesta, C.Francile
(Observatorio Astronomico Felix Aguilar OAFA),
R. Rebolo, M. Serra
(The Instituto de Astrofisica de Canarias),
D. Buckley
(South African Astronomical Observatory),
O.A. Gres, N.M. Budnev
(Irkutsk State University, API),
B.L.Carrasco, J.R.Valdes,V.Chavushyan, C.J.Martinez, V.M.Patino Alvarez,
M.L.H.Rodriguez (INAOE, OAGH)
A. Tlatov, D. Dormidontov
(Kislovodsk Solar Station of the Pulkovo Observatory),
A. Gabovich, V.Yurkov
(Blagoveschensk Educational State University)
MASTER-Amur robotic telescope (Global MASTER-Net: http://observ.pereplet.ru, Lipunov et al., 2010, Advances in Astronomy, vol. 2010, 30L) located in Russia (Blagoveshchensk State Pedagogical University) was pointed to the Swift GRB 220117B ( A. Melandri et al., GCN 31468) errorbox 380 sec after notice time and 437 sec after trigger time at 2022-01-17 20:12:45 UT, with upper limit up to 12.4 mag. The observations began at zenith distance = 79 deg. The sun altitude is -29.8 deg.
The galactic latitude b = 34 deg., longitude l = 303 deg.
Real time updated cover map and OT discovered available here:
https://master.sai.msu.ru/site/master2/observ.php?id=1852756
We obtain a following upper limits.
Tmid-T0 | Site |Filt.| Expt. | Limit| Comment
_________|_____________________|_____|_______|______|________
483 | MASTER-Amur | P/ | 90 | 12.4 |
The observation and reduction will continue.
The message may be cited.
GCN Circular 31473
Subject
GRB 220117B: Enhanced Swift-XRT position
Date
2022-01-18T02:07:41Z (3 years ago)
From
Phil Evans at U of Leicester <pae9@leicester.ac.uk>
P.A. Evans, M.R. Goad, J.P. Osborne and A.P. Beardmore (U. Leicester)
report on behalf of the Swift-XRT team.
Using 867 s of XRT Photon Counting mode data and 3 UVOT
images for GRB 220117B, 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 = 191.95292, -28.74540 which is equivalent
to:
RA (J2000): 12h 47m 48.70s
Dec (J2000): -28d 44' 43.4"
with an uncertainty of 2.3 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 31474
Subject
GRB 220117B: MITSuME Akeno optical upper limits
Date
2022-01-18T02:45:51Z (3 years ago)
From
Naohiro Ito at Tokyo Tech <n.ito@hp.phys.titech.ac.jp>
N. Ito, R. Hosokawa, K. L. Murata, M. Niwano, Y. Imai, Y. Takamatsu, R.
Yamaguchi, R. Noto, S. Sato, M. Takaku, Y. Yatsu, and N. Kawai (Tokyo Tech)
report on behalf of the MITSuME collaboration:
We observed the field of GRB 220117B (A. Melandri et al. GCN Circular
#31468, V. Lipunov et al. GCN Circular #31469) with the optical three color
(g', Rc, and Ic) CCD cameras attached to the MITSuME 50 cm telescope Akeno.
The observation started at 2022-01-17 20:06:58 UT (1.5 minutes after Swift
trigger). We stacked the images with good conditions. We did not detect any
sources within the XRT error region (A. Melandri et al. GCN Circular
#31468). We obtained the 5-sigma limits of the stacked images as follows.
T0+[minutes] MID-UT T-EXP[sec] 5-sigma limits
------------------------------------------------------------------------------------------------
2.9 2022-01-17 20:08:19 80 g'>16.3, Rc>16.4, Ic>15.8
28.7 2022-01-17 20:34:10 2280 g'>16.5, Rc>17.0, Ic>16.5
------------------------------------------------------------------------------------------------
T0+ : Elapsed time after the burst
T-EXP: Total Exposure time
We used PS1 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. 2021, PASJ, Vol.73, Issue 1, Pages 4-24;
https://github.com/MNiwano/Eclaire).
GCN Circular 31475
Subject
GRB 220117B: Nanshan/NEXT optical upper limit
Date
2022-01-18T03:25:24Z (3 years ago)
From
Dong Xu at NAOC/CAS <dxu@nao.cas.cn>
S.Y. Fu (NAOC), Z.P. Zhu (NAOC,HUST), X. Liu, S.Q. Jiang, D. Xu (NAOC),
X. Gao (Urumqi No.1 Senior High School), J.Z. Liu (XAO) report:
We observed the field of GRB 220117B detected by Swift (Melandri et al.,
GCN 31468) using the NEXT-0.6m telescope located at Nanshan, Xinjiang,
China. Observations automatically started at 20:07:36 UT on 2022-01-17,
i.e., 128 s after the BAT trigger, and a series of 40 s, 60 s, 90 s
frames were obtained in the Sloan r-band.
No uncatalogued optical transient is detected in our stacked images at
the Swift-XRT position (GCN 31468), down to limiting magnitudes of
r~18.5, calibrated with the nearby PanSTARRS field.
GCN Circular 31478
Subject
GRB 220117B: Swift-XRT refined Analysis
Date
2022-01-18T09:11:37Z (3 years ago)
From
Phil Evans at U of Leicester <pae9@leicester.ac.uk>
J.P. Osborne (U. Leicester), K.L. Page (U. Leicester), A.P. Beardmore
(U. Leicester), M.G. Bernardini (INAF-OAB), E. Ambrosi (INAF-IASFPA) ,
M. Capalbi (INAF-IASFPA), A. Tohuvavohu (U. Toronto), B. Sbarufatti
(PSU), D.N. Burrows (PSU) and A. Melandri report on behalf of the
Swift-XRT team:
We have analysed 6.7 ks of XRT data for GRB 220117B (Melandri et al.
GCN Circ. 31468), from 88 s to 28.6 ks after the BAT trigger. The data
comprise 203 s in Windowed Timing (WT) mode (the first 6 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 Evans et
al. (GCN Circ. 31473).
The late-time light curve (from T0+3.5 ks) can be modelled with a
power-law decay with a decay index of alpha=0.79 (+/-0.09).
A spectrum formed from the WT mode data can be fitted with an absorbed
power-law with a photon spectral index of 2.65 (+0.11, -0.10). The
best-fitting absorption column is 4.5 (+/-0.4) x 10^21 cm^-2, in
excess of the Galactic value of 7.6 x 10^20 cm^-2 (Willingale et al.
2013). The PC mode spectrum has a photon index of 2.04 (+0.19, -0.18)
and a best-fitting absorption column of 3.0 (+0.8, -0.7) x 10^21 cm^-2.
The counts to observed (unabsorbed) 0.3-10 keV flux conversion factor
deduced from this spectrum is 3.6 x 10^-11 (5.4 x 10^-11) erg cm^-2
count^-1.
A summary of the PC-mode spectrum is thus:
Total column: 3.0 (+0.8, -0.7) x 10^21 cm^-2
Galactic foreground: 7.6 x 10^20 cm^-2
Excess significance: 5.2 sigma
Photon index: 2.04 (+0.19, -0.18)
If the light curve continues to decay with a power-law decay index of
0.79, the count rate at T+24 hours will be 0.024 count s^-1,
corresponding to an observed (unabsorbed) 0.3-10 keV flux of 8.8 x
10^-13 (1.3 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/01093611.
This circular is an official product of the Swift-XRT team.
GCN Circular 31483
Subject
GRB 220117B: Swift/UVOT Upper Limits
Date
2022-01-18T14:15:21Z (3 years ago)
From
Alice Breeveld at MSSL-UCL <a.breeveld@ucl.ac.uk>
A. A. Breeveld (UCL-MSSL) and A. Melandri (INAF-OAB) report on behalf of the Swift/UVOT team:
The Swift/UVOT began settled observations of the field of GRB 220117B 104 s after the BAT trigger
(Melandri et al., GCN Circ. 31468).
No optical afterglow consistent with the XRT position (Evans et al. GCN Circ. 31473) 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 104 254 147 >19.7
white 104 3930 344 >20.5
v 4141 4341 197 >19.2
b 3525 5048 281 >20.7
u 262 4957 239 >19.8
w1 4552 4752 197 >20.0
m2 4346 4546 197 >20.3
w2 3936 4136 197 >20.4
The magnitudes in the table are not corrected for the Galactic extinction due to the reddening of
E(B-V) = 0.075 in the direction of the burst (Schlegel et al. 1998).
GCN Circular 31486
Subject
GRB 220117B: Swift-BAT refined analysis
Date
2022-01-18T15:36:36Z (3 years ago)
From
Amy Lien at GSFC <amy.y.lien@nasa.gov>
T. Parsotan (GSFC/UMBC), S. D. Barthelmy (GSFC),
H. A. Krimm (NSF), S. Laha (GSFC/UMBC),
A. Y. Lien (U Tampa), C. B. Markwardt (GSFC),
A. Melandri (INAF-OAB), D. M. Palmer (LANL),
T. Sakamoto (AGU), M. Stamatikos (OSU)
(i.e. the Swift-BAT team):
Using the data set from T-240 to T+717 sec from the recent telemetry
downlink, we report further analysis of BAT GRB 220117B (trigger #1093611)
(Melandri et al., GCN Circ. 31468). The BAT ground-calculated position is
RA, Dec = 191.989, -28.762 deg which is
RA(J2000) = 12h 47m 57.3s
Dec(J2000) = -28d 45' 42.8"
with an uncertainty of 2.7 arcmin, (radius, sys+stat, 90% containment).
The partial coding was 96%.
The mask-weighted light curve shows a weak structure that starts
at ~T-3 s and ends at ~T+23 s. T90 (15-350 keV) is 24.37 +- 4.63 sec
(estimated error including systematics).
The time-averaged spectrum from T-2.73 to T+23.29 sec is best fit
by a simple power-law model. The power law index of the time-averaged
spectrum is 1.94 +- 0.32. The fluence in the 15-150 keV band is
2.9 +- 0.6 x 10^-7 erg/cm2. The 1-sec peak photon flux measured from
T-0.13 sec in the 15-150 keV band is 0.5 +- 0.2 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/1093611/BA/
GCN Circular 31492
Subject
GRB 220117B: z-band limit
Date
2022-01-18T21:55:44Z (3 years ago)
From
Daniele B Malesani at Radboud U <d.malesani@astro.ru.nl>
A. Rossi (INAF/OAS), J. Palmerio (CNRS, GEPI - Paris Observatory), D. B.
Malesani (Radboud Univ. and DAWN/NBI), N. R. Tanvir (Univ. Leicester),
D. A. Kann (IAA/CSIC) report on behalf of the Stargate collaboration:
We observed the field of GRB 220117B (Melandri et al., GCN 31468) using
the acquisition camera of the X-shooter spectrograph, mounted on the ESO
VLT UT3 (Melipal). A single z-band image (120 s exposure time) is
available to us, taken approximately on January 18.2 UT (about 8.3 hr
after the GRB).
Inside the XRT position (Evans et al., GCN 31473), we detect no source
down to a limiting magnitude z > 21.5 mag (AB, 3 sigma limit).
We acknowledge excellent support from the ESO observing staff in
Paranal, in particular Michael Abdul-Masih, Diego Parraguez, and
Jonathan Smoker.
GCN Circular 31518
Subject
GRB 220117B: TARGET optical upper limit
Date
2022-01-23T08:06:29Z (3 years ago)
From
Takanori Sakamoto at AGU <tsakamoto@phys.aoyama.ac.jp>
Y. Koyanagi, K. Hasuda, T. Sakamoto (AGU)
We observed the field of GRB 220117B detected by Swift
(Melandri et al., GCN Circ. 31468) with The AGU Robotic
Gravitational-wave Electromagnetic Telescope (TARGET)
equipped with the Veloce RH200 (20 cm OTA) and the large
format CCD camera (ATK11000) located at the Machida field
of Aoyama Gakuin University. 18 images of 60 sec exposures
were taken in the R filter starting from January 17
20:08:41 (UT) about 3.2 minutes after the trigger and
stopped on January 17 20:41:42 (UT). We do not detect the
optical afterglow both in the individual images and the
stacked image at the enhanced XRT position (Evans, et al.
GCN Circ. 31473). The estimated five sigma upper limit of
the combined image (total exposure of 1080 sec)
is ~15.3 mag using the USNO-B1 catalog.