Gamma-ray Burst 241215A

(All information courtesy of the instrument teams.)

Previous IAU Circulars

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Results of Observations

GCN NOTICE

TITLE:          GCN/INTEGRAL NOTICE
NOTICE_DATE:    Sun 15 Dec 24 13:53:41 UT
NOTICE_TYPE:    INTEGRAL Weak
TRIGGER_NUM:    11001,   Sub_Num: 0
GRB_RA:          10.5970d {+00h 42m 23s} (J2000),
                 10.9333d {+00h 43m 44s} (current),
                  9.9251d {+00h 39m 42s} (1950)
GRB_DEC:        +32.4560d {+32d 27' 22"} (J2000),
                +32.5925d {+32d 35' 33"} (current),
                +32.1820d {+32d 10' 55"} (1950)
GRB_ERROR:      3.37 [arcmin, radius, statistical only]
GRB_INTEN:      7.66 [sigma]
GRB_TIME:       50004.17 SOD {13:53:24.17} UT
GRB_DATE:       20659 TJD;   350 DOY;   24/12/15
SC_RA:            7.75 [deg] (J2000)
SC_DEC:          43.13 [deg] (J2000)
SUN_POSTN:      263.56d {+17h 34m 15s}  -23.30d {-23d 18' 11"}
SUN_DIST:       116.37 [deg]   Sun_angle= -7.2 [hr] (East of Sun)
MOON_POSTN:      86.36d {+05h 45m 27s}  +28.37d {+28d 22' 10"}
MOON_DIST:       63.74 [deg]
GAL_COORDS:     120.72,-30.38 [deg] galactic lon,lat of the burst
ECL_COORDS:      23.22, 25.51 [deg] ecliptic lon,lat of the burst
COMMENTS:       INTEGRAL GRB Coordinates -- this is the weak/subthreshold trigger notice.  
COMMENTS:       This notice may or may not be followed by a Wakeup/Refined/Offline notice.  
COMMENTS:       Time_Scale=5.0000 and Time_Error=5.0000.  
COMMENTS:       Possibly real GRB event (WEAK detection)

GCN NOTICE

TITLE:          GCN/INTEGRAL NOTICE
NOTICE_DATE:    Sun 15 Dec 24 13:53:46 UT
NOTICE_TYPE:    INTEGRAL Wakeup
TRIGGER_NUM:    11001,   Sub_Num: 1
GRB_RA:          10.5810d {+00h 42m 19s} (J2000),
                 10.9173d {+00h 43m 40s} (current),
                  9.9092d {+00h 39m 38s} (1950)
GRB_DEC:        +32.4791d {+32d 28' 45"} (J2000),
                +32.6156d {+32d 36' 56"} (current),
                +32.2051d {+32d 12' 18"} (1950)
GRB_ERROR:      3.28 [arcmin, radius, statistical only]
GRB_INTEN:      8.16 [sigma]
GRB_TIME:       50007.88 SOD {13:53:27.88} UT
GRB_DATE:       20659 TJD;   350 DOY;   24/12/15
SC_RA:            7.75 [deg] (J2000)
SC_DEC:          43.13 [deg] (J2000)
SUN_POSTN:      263.56d {+17h 34m 15s}  -23.30d {-23d 18' 11"}
SUN_DIST:       116.36 [deg]   Sun_angle= -7.2 [hr] (East of Sun)
MOON_POSTN:      86.36d {+05h 45m 27s}  +28.37d {+28d 22' 11"}
MOON_DIST:       63.75 [deg]
GAL_COORDS:     120.70,-30.35 [deg] galactic lon,lat of the burst
ECL_COORDS:      23.22, 25.54 [deg] ecliptic lon,lat of the burst
COMMENTS:       INTEGRAL GRB Coordinates.
COMMENTS:       Time_Scale=1.2799 and Time_Error=8.0000.  
COMMENTS:       Possibly real GRB event

GCN NOTICE

TITLE:          GCN/INTEGRAL NOTICE
NOTICE_DATE:    Sun 15 Dec 24 13:56:45 UT
NOTICE_TYPE:    INTEGRAL Refined
TRIGGER_NUM:    11001,   Sub_Num: 2
GRB_RA:          10.5955d {+00h 42m 23s} (J2000),
                 10.9318d {+00h 43m 44s} (current),
                  9.9236d {+00h 39m 42s} (1950)
GRB_DEC:        +32.4914d {+32d 29' 29"} (J2000),
                +32.6279d {+32d 37' 40"} (current),
                +32.2174d {+32d 13' 03"} (1950)
GRB_ERROR:      2.90 [arcmin, radius, statistical only]
GRB_INTEN:      11.73 [sigma]
GRB_TIME:       50007.17 SOD {13:53:27.17} UT
GRB_DATE:       20659 TJD;   350 DOY;   24/12/15
SC_RA:            7.75 [deg] (J2000)
SC_DEC:          43.13 [deg] (J2000)
SUN_POSTN:      263.57d {+17h 34m 16s}  -23.30d {-23d 18' 12"}
SUN_DIST:       116.37 [deg]   Sun_angle= -7.2 [hr] (East of Sun)
MOON_POSTN:      86.40d {+05h 45m 35s}  +28.37d {+28d 22' 14"}
MOON_DIST:       63.76 [deg]
GAL_COORDS:     120.72,-30.34 [deg] galactic lon,lat of the burst
ECL_COORDS:      23.24, 25.54 [deg] ecliptic lon,lat of the burst
COMMENTS:       INTEGRAL GRB Coordinates.
COMMENTS:       Time_Scale=10.0000 and Time_Error=10.0000.  
COMMENTS:       Possibly real GRB event

GCN Circular #38572
V.Lipunov, E.Gorbovskoy, N.Tiurina, P.Balanutsa, , D.Vlasenko, I.Panchenko, A.Kuznetsov, G.Antipov, A.Sankovich, A.Sosnovskij, Yu.Tselik, M.Gulyaev, Ya.Kechin, V.Senik, A.Chasovnikov, K.Labsina, I. Gorbunov (Lomonosov MSU), O.Gress, N.Budnev (ISU), C.Francile, F. Podesta, R.Podesta, E. Gonzalez (Observatorio Astronomico Felix Aguilar (OAFA), A. Tlatov, D. Dormidontov (Kislovodsk Solar Station of the Pulkovo Observatory), A. Gabovich, V.Yurkov (Blagoveschensk Educational StateUniversity) D.Buckley (SAAO), R.Rebolo (The Instituto de Astrofisica de Canarias), L.Carrasco, J.R.Valdes, V.Chavushyan, V.M.Patino Alvarez, J.Martinez, A.R.Corella, L.H.Rodriguez (INAOE, Guillermo Haro Astrophysics Observatory)
MASTER-Tunka robotic telescope (Global MASTER-Net: http://observ.pereplet.ru, Lipunov et al., 2010, Advances in Astronomy, vol. 2010, 30L) located in Russia (Applied Physics Institute, Irkutsk State University) was pointed to the Integral GRB241215.58 (trigger No 11001,00h 42m 22.96s , +32d 29m 29.4s, R=0.0483333) errorbox 26 sec after notice time and 53 sec after trigger time at 2024-12-15 13:54:21 UT, with upper limit up to 17.5 mag. The observations began at zenith distance = 27 deg. The sun altitude is -44.6 deg.
The galactic latitude b = -30 deg., longitude l = 121 deg.
Real time updated cover map and OT discovered available here: https://master.sai.msu.ru/site/master2/observ.php?id=2710514
We obtain a following upper limits.

Tmid-T0  |          Site       |Filt.| Expt. | Limit| Comment
_________|_____________________|_____|_______|______|________

      55 |        MASTER-Tunka |   C |     1 | 16.6 |        
      60 |        MASTER-Tunka |   C |     1 | 16.7 |        
      66 |        MASTER-Tunka |   C |     1 | 16.7 |        
      73 |        MASTER-Tunka |   C |     5 | 17.5 |        
      82 |        MASTER-Tunka |   C |     5 | 17.5 |        
      90 |        MASTER-Tunka |   C |     5 | 17.3 |        
      99 |        MASTER-Tunka |   C |     5 | 17.4 |        
     107 |        MASTER-Tunka |   C |     5 | 17.5 |        
     116 |        MASTER-Tunka |   C |     5 | 17.4 |        
     125 |        MASTER-Tunka |   C |     5 | 17.5 |        
     134 |        MASTER-Tunka |   C |     5 | 17.4 |        
     142 |        MASTER-Tunka |   C |     5 | 17.3 |        
     151 |        MASTER-Tunka |   C |     5 | 17.4 |        
     160 |        MASTER-Tunka |   C |     5 | 17.4 |        
     168 |        MASTER-Tunka |   C |     5 | 17.4 |        
     177 |        MASTER-Tunka |   C |     5 | 17.4 |        
     186 |        MASTER-Tunka |   C |     5 | 17.3 |        
     195 |        MASTER-Tunka |   C |     5 | 17.4 |        
     204 |        MASTER-Tunka |   C |     5 | 17.4 |        
     212 |        MASTER-Tunka |   C |     5 | 17.3 |        
     221 |        MASTER-Tunka |   C |     5 | 17.4 |        
     230 |        MASTER-Tunka |   C |     5 | 17.5 |        
     238 |        MASTER-Tunka |   C |     5 | 17.4 |        
     247 |        MASTER-Tunka |   C |     5 | 17.4 |        
     255 |        MASTER-Tunka |   C |     5 | 17.4 |        
     264 |        MASTER-Tunka |   C |     5 | 17.5 |        
     272 |        MASTER-Tunka |   C |     5 | 17.5 |        
     281 |        MASTER-Tunka |   C |     5 | 17.5 |        
     290 |        MASTER-Tunka |   C |     5 | 17.4 |        
     298 |        MASTER-Tunka |   C |     5 | 17.3 |        
     307 |        MASTER-Tunka |   C |     5 | 17.4 |        
     316 |        MASTER-Tunka |   C |     5 | 17.4 |        
     324 |        MASTER-Tunka |   C |     5 | 17.4 |        
     341 |        MASTER-Tunka |   C |     5 | 17.4 |        
     350 |        MASTER-Tunka |   C |     5 | 17.4 |        
     359 |        MASTER-Tunka |   C |     5 | 17.4 |        
     368 |        MASTER-Tunka |   C |     5 | 17.5 |        
     376 |        MASTER-Tunka |   C |     5 | 17.4 |        
     385 |        MASTER-Tunka |   C |     5 | 17.4 |        
     393 |        MASTER-Tunka |   C |     5 | 17.4 |        
     402 |        MASTER-Tunka |   C |     5 | 17.5 |        
     410 |        MASTER-Tunka |   C |     5 | 17.5 |        
     426 |        MASTER-Tunka |   C |     5 | 17.5 |        
     437 |        MASTER-Tunka |   C |     5 | 17.5 |        
     445 |        MASTER-Tunka |   C |     5 | 17.4 |        
     454 |        MASTER-Tunka |   C |     5 | 17.4 |        
     463 |        MASTER-Tunka |   C |     5 | 17.5 |        
     471 |        MASTER-Tunka |   C |     5 | 17.4 |        
     482 |        MASTER-Tunka |   C |     5 | 17.5 |        
     491 |        MASTER-Tunka |   C |     5 | 17.5 |        
     500 |        MASTER-Tunka |   C |     5 | 17.5 |        
     509 |        MASTER-Tunka |   C |     5 | 17.4 |        
     518 |        MASTER-Tunka |   C |     5 | 17.4 |        
     526 |        MASTER-Tunka |   C |     5 | 17.4 |        
     535 |        MASTER-Tunka |   C |     5 | 17.4 |        
     543 |        MASTER-Tunka |   C |     5 | 17.3 |        
     552 |        MASTER-Tunka |   C |     5 | 17.4 |        
     571 |        MASTER-Tunka |   C |     5 | 17.3 |        
     583 |        MASTER-Tunka |   C |     5 | 17.3 |        
     593 |        MASTER-Tunka |   C |     5 | 17.4 |        
     602 |        MASTER-Tunka |   C |     5 | 17.4 |        
     611 |        MASTER-Tunka |   C |     5 | 17.4 |        
     620 |        MASTER-Tunka |   C |     5 | 17.4 |

Filter C is a clear (unfiltred) band.
The observation and reduction will continue. The message may be cited.

GCN Circular #38573
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 30 s has been detected by IBAS in the IBIS/ISGRI data at 13:53:15 UT of 2024 December 15.
The refined coordinates (J2000) are:
```
R.A.=    10.5861 deg
DEC.=   +32.5190 deg
```
with an uncertainty of 2.5 arcmin (90% c.l.).
The burst had a peak flux of 0.5 ph/cm2/s (20-200 keV, 1-s integration time) and a fluence in the same energy range of about 4e-7 erg/cmq.
A plot of the light curve will be posted at http://ibas.iasf-milano.inaf.it/IBAS_Results.html

GCN NOTICE

TITLE:          GCN/INTEGRAL NOTICE
NOTICE_DATE:    Sun 15 Dec 24 15:08:08 UT
NOTICE_TYPE:    INTEGRAL Offline
TRIGGER_NUM:    11001,   Sub_Num: 3
GRB_RA:          10.5861d {+00h 42m 21s} (J2000),
                 10.9224d {+00h 43m 41s} (current),
                  9.9142d {+00h 39m 39s} (1950)
GRB_DEC:        +32.5188d {+32d 31' 08"} (J2000),
                +32.6553d {+32d 39' 19"} (current),
                +32.2448d {+32d 14' 41"} (1950)
GRB_ERROR:      2.50 [arcmin, radius, statistical only]
GRB_INTEN:      11.73 [sigma]
GRB_TIME:       50007.17 SOD {13:53:27.17} UT
GRB_DATE:       20659 TJD;   350 DOY;   24/12/15
SC_RA:            7.75 [deg] (J2000)
SC_DEC:          43.13 [deg] (J2000)
SUN_POSTN:      263.62d {+17h 34m 29s}  -23.31d {-23d 18' 20"}
SUN_DIST:       116.32 [deg]   Sun_angle= -7.2 [hr] (East of Sun)
MOON_POSTN:      87.19d {+05h 48m 46s}  +28.39d {+28d 23' 28"}
MOON_DIST:       64.38 [deg]
GAL_COORDS:     120.71,-30.31 [deg] galactic lon,lat of the burst
ECL_COORDS:      23.24, 25.57 [deg] ecliptic lon,lat of the burst
COMMENTS:       INTEGRAL GRB Coordinates.
COMMENTS:       Time_Scale=10.0000 and Time_Error=10.0000.  
COMMENTS:       refined_coordinates_after_offline_analysis

GCN Circular #38574
T. Mohan, A.P. Saikia, V. Swain, R. Kumar, V. Bhalerao (IITB), G.C. Anupama, S. Barway (IIA) and K. Angail (IAO) report on behalf of the GIT team:
We observed the field of the GRB 241215A (Mereghetti et al., GCN 38573) with the 0.7m GROWTH-India Telescope (GIT). Observation started at 2024-12-15T15:27:41 UT, about 1.57 hours after the trigger. We responded to the coordinates reported in GCN notices (trigger No 11001, RA = 10.5810 deg, DEC = 32.4791 deg) and obtained multiple images of 300s in r' filter. With current FOV of 7.5 x 11 arcmin and scale: 0.2 arcsec/pixel, we covered 71 percent of the localization centered around refined coordinates given in GCN 38573.
The obtained upper limit in our stacked image is:
```
| MJD (mid)   | Filter | Exposure (s) | Limiting Magnitude (AB) |
| ----------- | ------ | ------------ | ----------------------- |
| 60659.65319 | r'     | 5x300        | 19.9                    |             |
```
The upper limit is consistent with Lipunov et el., GCN 38572.
The magnitude is calibrated against PanSTARRS DR1 (Chambers et al., 2016) and not corrected for Galactic extinction.
The GROWTH India Telescope (GIT, Kumar et al. 2022) is a 70-cm telescope with a 0.7-degree field of view, set up by the Indian Institute of Astrophysics (IIA) and the Indian Institute of Technology Bombay (IITB) with funding from DST-SERB and IUSSTF. It is located at the Indian Astronomical Observatory (Hanle), operated by IIA. We acknowledge funding by the IITB alumni batch of 1994, which partially supports the operations of the telescope. Telescope technical details are available at https://sites.google.com/view/growthindia/.
GCN Circular #38575
S. Leonini, M. Conti, P. Rosi, L.M. Tinjaca Ramirez (Montarrenti Observatory, Siena, Italy, part of UAI/SSV-GRB section), M.G. Dainotti (National Astronomical Observatory of Japan), Y. Niino (Tokyo University, Institute of Astronomy) and K. Kalinowski (Aarhus University, Department of Physics and Astronomy) report:
We performed follow-up observations of the field of GRB 241215A with the automated and remoted 0.53m Ritchey-Chretien telescope at Montarrenti Observatory (Siena, Italy, IAU code C88).
Observations were started at 2024-12-15 17:34:42 UT, 3.83 hours after burst (Mereghetti et al., GCN 38573) stacking 80x40s Rc-band CCD images.
In our preliminary analysis, we have not found any optical transient candidate within the error-box (2.5 arcmin.) of The INTEGRAL Burst Alert System position (RA 00h 42m 20.66s, Dec. +32d 31m 7.68s - J2000) down to the following 3-sigma optical upper limits:
```
   MJD          Exp.     Filter    UL (3-sigma)     
60660.2680     80x40s      Rc        >  20.3
```
Magnitude was calibrated with the nearby PanSTARRS stars converted using Lupton (2005) equations. No correction for galactic dust extinction was applied.
The upper limit is consistent with other already reported (Lipunov et al., GCN 38572; Mohan et al., GCN 38574).
GCN Circular #38576
X. Liu, S.Q. Jiang, J. An, S.Y. Fu, Z.P. Zhu, D. Xu (NAOC), X. Gao (Urumqi No.1 Senior High School), J.Z. Liu (XAO) report on behalf of a large collaboration:
We observed the field of GRB241215A detected by INTEGRAL/IBIS (Mereghetti et al., GCN 38573) using the HMT-0.5m telescope located at Nanshan, Xinjiang, China. Observations started at 2024-12-15T16:09:56.00, i.e., ~ 2.28 hrs after the INTEGRAL trigger and consisted of 15 x 90 s frames without any filter.
No uncatalogued optical source is detected in our stacked images within the INTEGRAL/IBIS 2.5 arcmin error circle (Mereghetti et al., GCN 38573), down to a 3 sigma upper limit of r ~ 19.8, calibrated with nearby Pan-STARRS stars and not corrected for Galactic extinction.
GCN Circular #38580
N. Pankov (HSE, IKI), A. Pozanenko (IKI), E. Klunko (ISTP) report on behalf of IKI-GRB-FuN:
We performed optical observations of the field of GRB 241215A (Mereghetti et. al, GCN 38573; Mohan et. al, GCN 38574; Leonini et. al, GCN 38575; Liu et. al, GCN 38576) in the R filter with AZT-33IK of Sayan (Mondy) observatory. The observations began on 2024-12-15 14:27 UT, i.e. ~1.08 hr since INTEGRAL trigger. We have covered the entire localization area assessed by the INTEGRAL team (Mereghetti et. al, GCN 38573). No candidate transients were found using image subtraction with ```apex_subtract``` pipeline against the PS1 template image. The preliminary upper limit of the stacked image is given below:
```
| Date       | UTstart  | t-T0 (mid, days) | Exptime (n*s) | Filter | Magnitude | UL (3sigma) |
| ---------- | -------- | ---------------- | ------------- | ------ | --------- | ----------- |
| 2024-12-15 | 14:27:52 | 0.044875         | 30*120        | R      | n/d       | 21.3        |
```
The magnitudes were calibrated using nearby stars from USNO-B1.0 (R2 magnitudes) and are not corrected for the Galactic extinction.

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Jochen Greiner, last update: 16-Dec-2024 [Disclaimer]