| Summary table |
|---|
| Variable |
Value |
Source |
| T0 |
8:14:10 UTC |
GCN_circulars,INTEGRAL |
| ra |
350.6500° |
IPN |
| decl |
-4.2500° |
IPN |
| pos_error |
1.67e-02° |
IPN |
| GBM_located |
False |
|
| mjd |
59931.3431712963 |
GCN_circulars,INTEGRAL |
| IPN table |
|---|
| GRB_name |
GRB221218A |
| ra |
350.6500° |
| decl |
-4.2500° |
| pos_error |
1.67e-02° |
| GCN 33082 table |
|---|
| GRB_name |
GRB221218A |
| GCN_number |
33082 |
| Detection_method |
INTEGRAL |
| t_trigger |
8:14:10 UTC |
| ra |
350.6495° |
| decl |
-4.2477° |
| Circular_text |
TITLE: GCN CIRCULAR
NUMBER: 33082
SUBJECT: GRB 221218A: a long GRB detected by INTEGRAL
DATE: 22/12/18 21:56:21 GMT
FROM: Sandro Mereghetti at IASF-Milano/INAF
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 140 s has been detected by IBAS in the
IBIS/ISGRI data at 08:14:10 UT of 2022 December 18.
The refined coordinates (J2000) are:
R.A.= 350.6495 deg
DEC.= -4.2477 deg
with an uncertainty of 1 arcmin (90% c.l.).
The burst had a peak flux of 1 ph/cm2/s (20-200 keV, 1-s integration time)
and a fluence in the same energy range of about 5e-6 erg/cmq.
A plot of the light curve will be posted at
http://ibas.iasf-milano.inaf.it/IBAS_Results.html
|
| GCN 33085 table |
|---|
| GRB_name |
GRB221218A |
| GCN_number |
33085 |
| Detection_method |
IBAS |
| Circular_text |
TITLE: GCN CIRCULAR
NUMBER: 33085
SUBJECT: GRB 221218A: KAIT Optical Upper Limit
DATE: 22/12/19 18:50:23 GMT
FROM: Weikang Zheng at UC Berkeley
WeiKang Zheng and Alexei V. Filippenko (UC Berkeley) report on
behalf of the KAIT GRB team:
The 0.76-m Katzman Automatic Imaging Telescope (KAIT), located at
Lick Observatory, responded to INTEGRAL GRB 221218A (Mereghetti et al.,
GCN 33082) starting at 0.78 days after the burst. A total of
23x60s images were obtained in the clear (roughly R) filters.
We do not detect any optical afterglow candidate within the IBAS
position error circle (Mereghetti et al., GCN 33082), neither in
single image, nor in the co-add images. The typical limiting magnitude
of our single clear image is about 18.5 mag calibrated to the PS1 catalog.
|
| GCN 33086 table |
|---|
| GRB_name |
GRB221218A |
| GCN_number |
33086 |
| Detection_method |
Optical |
| Circular_text |
TITLE: GCN CIRCULAR
NUMBER: 33086
SUBJECT: GRB 221218A: BOOTES-4/MET and OSN optical upper limits
DATE: 22/12/20 08:23:25 GMT
FROM: Youdong HU at IAA-CSIC
Y.-D. Hu, F. Aceituno, E. Fernandez-Garcia, I. Perez-Garcia, A. J. Castro-Tirado, M. D. Caballero-Garcia, R. Sanchez-Ramirez, S. Guziy (IAA-CSIC), C. Perez del Pulgar, A. Castellon, I. Carrasco (Univ. de Malaga) and D. R. Xiong, Y. F. Fan, J. M. Bai, C. J. Wang, Y. X. Xin, X. H. Zhao (Yunnan Observatories of CAS) on behalf of a larger collaboration, report:
Following the detection of GRB 221218A by INTEGRAL (Mereghetti et al. GCNC 33082), we triggered the 0.6m BOOTES-4/MET robotic telescope at Lijiang Astronomical Observatory (China) to follow up starting on Dec. 19 at 12:52:50 UT (~1.2 day post burst). No new source is detected within the IBAS error region (Mereghetti et al. GCNC 33082) in the co-added image (6 x 60 s, clear filter) down to 19.2 mag.
Later on, we also triggered the 0.9m OSN telescope in Granada (Spain) starting on Dec. 19 at 18:02:59 UT (~1.4 day post burst). Ten images covering the IBAS error region were taken in the I-band. No optical afterglow is detected in the stacked image down to I=20.1. These results are in agreement with the non-detection reported by Lipunov et al. (GCNC 33081) and Zheng et al. (GCNC 33085).
We thank the staff both at Lijiang observatory and OSN for their excellent support.
|
| GCN 33087 table |
|---|
| GRB_name |
GRB221218A |
| GCN_number |
33087 |
| Detection_method |
MITSuME |
| Circular_text |
TITLE: GCN CIRCULAR
NUMBER: 33087
SUBJECT: GRB 221218A: MITSuME Akeno optical upper limits
DATE: 22/12/20 10:21:15 GMT
FROM: Ichiro Takahashi at Tokyo Tech
I. Takahashi, M. Niwano, R. Hosokawa, K. L. Murata, Y. Imai, N. Ito,
S. Sato, N. Higuchi, M. Tateda, M. Sasada, Y. Yatsu, and N. Kawai
(Tokyo Tech) report on behalf of the MITSuME collaboration:
We observed the field of GRB 221218A (S. Mereghetti et al. GCN
Circular #33082, WeiKang Zheng et al. GCN Circular #33085, Y.-D. Hu et
al. GCN Circular #33086) with the optical three color (g', Rc, and Ic)
CCD cameras attached to the MITSuME 50 cm telescope Akeno.
The observation with a series of 60 sec exposures started at
2022-12-18 08:37:35 UT (1405 seconds after the INTEGRAL trigger). We
stacked the images with good conditions. We did not detect any
uncatalogued sources within the error region (S. Mereghetti et al. GCN
Circular #33082). We obtained the 5-sigma limits of the stacked images
as follows.
T0+[sec] | MID-UT | T-EXP[sec] | 5-sigma limits
------------------------------------------------------------------------------------------------
1405 | 2022-12-18 08:51:23 | 1140.0 | g'>19.1, Rc>19.0, Ic>18.4
------------------------------------------------------------------------------------------------
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 33090 table |
|---|
| GRB_name |
GRB221218A |
| GCN_number |
33090 |
| Detection_method |
Optical |
| Circular_text |
TITLE: GCN CIRCULAR
NUMBER: 33090
SUBJECT: GRB 221218A: 3.6m DOT optical upper limit
DATE: 22/12/21 21:44:51 GMT
FROM: Rahul Gupta at ARIES, India
Rahul Gupta, Amit K. Ror, S. B. Pandey, A. Aryan, A. Ghosh, Dimple, and K.
Misra (ARIES) report:
We observed the field of GRB 221218A detected by INTEGRAL (Mereghetti et al.,
GCN 33082) using the 4Kx4K CCD Imager (Pandey et al. 2017,
arXiv:1711.05422v1) mounted at the axial port of the 3.6m Devasthal Optical
Telescope of ARIES Nainital. We have taken multiple frames having an
exposure time of 300 sec in the R filter. We stacked the images after the
alignment. We do not find any evidence of an afterglow candidate inside the
INTEGRAL error circle, consistent with other non-detections (Lipunov et al.,
GCN 33081; Zheng et al., GCN 33085; Hu et al., GCN 33086; and Takahashi et
al., GCN 33087). We obtained the limiting mag of ~ 22.8 mag at ~ 2.3 days
post-detection. Despite early to late time deep optical follow-up
observations, the non-detection of the optical counterpart of GRB 221218A
indicates the dark nature of the burst, although more detailed analysis is
needed to confirm.
The limiting magnitudes quoted are not corrected for the Galactic and host
extinction in the direction of the burst. Photometric calibration is
performed using the standard stars from the USNO-B1.0 catalogue.
This circular may be cited. 3.6m Devasthal Optical Telescope (DOT) is
the recently commissioned facility in the 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.
|