GRB 250216A
GCN Circular 39347
Subject
GRB 250216A: Fermi GBM Final Real-time Localization
Date
2025-02-16T20:31:20Z (3 months ago)
From
Fermi GBM Team at MSFC/Fermi-GBM <do_not_reply@GIOC.nsstc.nasa.gov>
Via
email
The Fermi GBM team reports the detection of a likely LONG GRB
At 20:20:43 UT on 16 Feb 2025, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 250216A (trigger 761430048.867762 / 250216848).
The on-ground calculated location, using the Fermi GBM trigger data, is RA = 212.4, Dec = 60.2 (J2000 degrees, equivalent to J2000 14h 09m, 60d 12'), with a statistical uncertainty of 12.7 degrees.
The angle from the Fermi LAT boresight is 50.0 degrees.
The skymap can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2025/bn250216848/quicklook/glg_skymap_all_bn250216848.png
The HEALPix FITS file, including the estimated localization systematic, can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2025/bn250216848/quicklook/glg_healpix_all_bn250216848.fit
The GBM light curve can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2025/bn250216848/quicklook/glg_lc_medres34_bn250216848.gif
GCN Circular 39349
Subject
Fermi GRB 250216A: Global MASTER-Net observations report
Date
2025-02-16T23:02:13Z (3 months ago)
From
Vladimir Lipunov at Moscow State U/Krylov Obs <lipunov@xray.sai.msu.ru>
Via
email
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-Kislovodsk robotic telescope (Global MASTER-Net: http://observ.pereplet.ru, Lipunov et al., 2010, Advances in Astronomy, vol. 2010, 30L) located in Russia (Lomonosov MSU, Kislovodsk Solar Station of Pulkovo observatory) started inspect of the Fermi GRB 250216A ( Fermi GBM team, GCN 39347) errorbox 7487 sec after notice time and 7522 sec after trigger time at 2025-02-16 22:26:06 UT, with upper limit up to 17.5 mag. The observations began at zenith distance = 32 deg. The sun altitude is -56.4 deg.
The galactic latitude b = 54 deg., longitude l = 106 deg.
Real time updated cover map and OT discovered available here:
https://master.sai.msu.ru/site/master2/observ.php?id=2780267
We obtain a following upper limits.
Tmid-T0 | Date Time | Site | Coord (J2000) |Filt.| Expt. | Limit| Comment
_________|_____________________|_____________________|____________________________________|_____|_______|_______|________
7553 | 2025-02-16 22:26:06 | MASTER-Kislovodsk | (14h 04m 27.49s , +60d 18m 33.1s) | C | 60 | 17.3 |
7633 | 2025-02-16 22:27:26 | MASTER-Kislovodsk | (14h 20m 34.14s , +60d 16m 43.3s) | C | 60 | 17.5 |
7813 | 2025-02-16 22:30:27 | MASTER-Kislovodsk | (13h 47m 28.02s , +58d 25m 39.4s) | C | 60 | 17.1 |
7893 | 2025-02-16 22:31:47 | MASTER-Kislovodsk | (14h 02m 50.11s , +58d 24m 15.8s) | C | 60 | 17.0 |
8554 | 2025-02-16 22:42:48 | MASTER-Kislovodsk | (14h 04m 29.75s , +60d 18m 27.7s) | C | 60 | 15.7 |
8634 | 2025-02-16 22:44:07 | MASTER-Kislovodsk | (14h 20m 27.55s , +60d 17m 01.8s) | C | 60 | 16.6 |
8714 | 2025-02-16 22:45:27 | MASTER-Kislovodsk | (13h 47m 31.98s , +58d 24m 11.2s) | C | 60 | 15.6 |
8793 | 2025-02-16 22:46:47 | MASTER-Kislovodsk | (14h 02m 43.06s , +58d 25m 29.6s) | C | 60 | 16.3 |
8976 | 2025-02-16 22:49:50 | MASTER-Kislovodsk | (13h 51m 50.42s , +62d 12m 49.6s) | C | 60 | 16.0 |
9056 | 2025-02-16 22:51:10 | MASTER-Kislovodsk | (14h 08m 55.17s , +62d 13m 26.3s) | C | 60 | 16.0 |
Filter C is a clear (unfiltred) band.
The observation and reduction will continue.
The message may be cited.
GCN Circular 39360
Subject
GRB 250216A: AstroSat CZTI detection
Date
2025-02-18T05:55:34Z (3 months ago)
From
Gaurav Waratkar at IIT Bombay <gauravwaratkar@iitb.ac.in>
Via
Web form
M. Tembhurnikar (IUCAA), G. Waratkar (IITB), J. Joshi (IUCAA), A. Vibhute (IUCAA), V. Bhalerao (IITB), D. Bhattacharya (Ashoka University/IUCAA), A. R. Rao (IUCAA/TIFR), and S. Vadawale (PRL) report on behalf of the AstroSat CZTI collaboration:
Analysis of AstroSat CZTI data with the CIFT framework (Sharma et al., 2021, JApA, 42, 73) showed a faint detection of GRB 250216A which was also detected by Fermi/GBM (Fermi-GBM Team, GCN Circ. 39347). Inspection of INTEGRAL/SPI-ACS data also showed the detection of the burst.
Due to the likely hard nature of the burst, we don’t see any detection in the CZT detectors (20-200 keV).
The source was faintly detected in the CsI anticoincidence (Veto) detector in the 100-500 keV energy range and we see only the initial short spike from the Fermi/GBM lightcurve. The light curve peaks at 2025-02-16 20:20:42.4 UTC. The measured peak count rate associated with the burst is 273 (+63, -65) counts/s above the background in the combined data of all quadrants, with a total of 399 (+207, -194) counts. Due to the intrinsic 1 s binning of veto data, we cannot reliably estimate a T90 from it.
CZTI is built by a TIFR-led consortium of institutes across India, including VSSC, URSC, IUCAA, SAC, and PRL. The Indian Space Research Organisation funded, managed, and facilitated the project.
CZTI GRB detections are reported regularly on the payload site at:
http://astrosat.iucaa.in/czti/?q=grb