GCN Circulars
GCN Circulars are rapid astronomical bulletins submitted by and distributed to community members worldwide. They are used to share discoveries, observations, quantitative near-term predictions, requests for follow-up observations, or future observing plans related to high-energy, multi-messenger, and variable or transient astrophysical events. See the documentation for help with subscribing to or submitting Circulars.
To navigate to a specific circular, enter the associated Circular ID (e.g. 'gcn123', 'Circular 123', or '123').
286 results found.
- IceCube-200614A: No counterpart candidates in INTEGRAL SPI-ACS prompt observation
- Fermi-LAT Gamma-ray Observations of IceCube-200530A
- IceCube-200530A: No counterpart candidates in INTEGRAL SPI-ACS prompt observation
- Fermi-LAT Gamma-ray Observations of IceCube-190523A
- Fermi-LAT Gamma-ray Observations of IceCube-200512A
- IceCube-200512A: No counterpart candidates in INTEGRAL SPI-ACS prompt observation
- Konus-Wind observation of SGR 1935+2154 activity on 2020 May 10
- IceCube-200425A: No counterpart candidates in INTEGRAL SPI-ACS prompt observation
- IceCube-200421A: No counterpart candidates in INTEGRAL SPI-ACS and IBIS prompt observation
- Fermi-LAT Gamma-ray Observations of IceCube-200410A
- IceCube-200410A: Possible associated excess in INTEGRAL SPI-ACS prompt observation
- LIGO/Virgo S200316bj: No counterpart candidates in INTEGRAL SPI-ACS, and IBIS prompt observation
- LIGO/Virgo S200311bg: No counterpart candidates in INTEGRAL SPI-ACS,prompt observation
- LIGO/Virgo S200302c: No counterpart candidates in INTEGRAL SPI-ACS and IBIS prompt observation
- Fermi-LAT Gamma-ray Observations of IceCube-200227A
- IceCube-200227A: No counterpart candidates in INTEGRAL SPI-ACS and IBIS prompt observation
- LIGO/Virgo S200225q: No counterpart candidates in INTEGRAL SPI-ACS and IBIS prompt observation
- LIGO/Virgo S200224ca: No counterpart candidates in INTEGRAL SPI-ACS prompt observation
- LIGO/Virgo S200219ac: No counterpart candidates in INTEGRAL SPI-ACS and IBIS prompt observation
- LIGO/Virgo S200213t: No counterpart candidates in INTEGRAL SPI-ACS prompt observation
- LIGO/Virgo S200208q: No counterpart candidates in INTEGRAL SPI-ACS prompt observation
- LIGO/Virgo S200129m: No counterpart candidates in INTEGRAL SPI-ACS prompt observation
- LIGO/Virgo S200128d: No counterpart candidates in INTEGRAL SPI-ACS prompt observation
- IceCube-200120A: no counterpart candidates in INTEGRAL SPI-ACS and,IBIS prompt observation
- IceCube-200117A: no counterpart candidates in INTEGRAL SPI-ACS and,IBIS prompt observation
- LIGO/Virgo S200114f: No counterpart candidates in INTEGRAL SPI-ACS and IBIS prompt observation
- LIGO/Virgo S200112r: upper limits from AGILE/GRID observations
- Fermi-LAT ANTARES coincidence: No counterpart candidates in INTEGRAL SPI-ACS and IBIS prompt observation
- Fermi-LAT Gamma-ray Observations of IceCube-200107A
- IceCube-200107A: No counterpart candidates in INTEGRAL SPI-ACS prompt observation
- LIGO/Virgo S200105ae: No counterpart candidates in INTEGRAL SPI-ACS prompt observation
- Fermi-LAT Gamma-ray Observations of IceCube-191231A
- IceCube-191231A: No counterpart candidates in INTEGRAL SPI-ACS and IBIS prompt observation
- Fermi-LAT Gamma-ray Observations of IceCube-191215A
- LIGO/Virgo S191215w: No counterpart candidates in INTEGRAL SPI-ACS prompt observation
- LIGO/Virgo S191215w: Identification of a GW compact binary merger candidate
- IceCube-191215A: No counterpart candidates in INTEGRAL SPI-ACS prompt observation
- LIGO/Virgo S191213g: No counterpart candidates in INTEGRAL SPI-ACS prompt observation
- LIGO/Virgo S191204r: No counterpart candidates in Fermi-LAT observations
- LIGO/Virgo S191205ah: No counterpart candidates in INTEGRAL SPI-ACS prompt observation
- IceCube-191204A: No counterpart candidates in INTEGRAL SPI-ACS prompt observation
- LIGO/Virgo S191204r: No counterpart candidates in INTEGRAL SPI-ACS prompt observation
- Fermi-LAT Gamma-ray Observations of IceCube-191119A
- IceCube-191119A - No counterpart candidates in INTEGRAL SPI-ACS prompt observation
- LIGO/Virgo S191110af: Potential pulsar counterparts
- Konus-Wind observation of the recent SGR 1935+2154 activity
- LIGO/Virgo S191110af: No counterpart candidates in INTEGRAL SPI-ACS, and IBIS prompt observation
- LIGO/Virgo S191110af: No counterpart candidates in INTEGRAL SPI-ACS, prompt observation
- LIGO/Virgo S191109d: No counterpart candidates in INTEGRAL SPI-ACS,prompt observation
- LIGO/Virgo S191105e: No counterpart candidates in INTEGRAL SPI-ACS and,IBIS prompt observation
- IceCube-191001A: No counterpart candidates in INTEGRAL SPI-ACS prompt observation
- LIGO/Virgo S190930t: No counterpart candidates in INTEGRAL SPI-ACS prompt observation
- LIGO/Virgo S190930s: No counterpart candidates in INTEGRAL SPI-ACS prompt observation
- Fermi-LAT Gamma-ray Observations of IceCube-190922B
- LIGO/Virgo S190924h: No counterpart candidates in INTEGRAL SPI-ACS and IBIS prompt observation
- LIGO/Virgo S190923y: No counterpart candidates in INTEGRAL SPI-ACS prompt observation
- IceCube-190922A: No counterpart candidates in INTEGRAL SPI-ACS prompt observation
- HAWC-190916A: No counterpart candidates in INTEGRAL SPI-ACS prompt observation
- LIGO/Virgo S190915ak: No counterpart candidates in INTEGRAL SPI-ACS prompt observation
- LIGO/Virgo S190910h: No counterpart candidates in INTEGRAL SPI-ACS prompt observation
- LIGO/Virgo S190910d: No counterpart candidates in INTEGRAL SPI-ACS prompt observation
- LIGO/Virgo S190901ap: No counterpart candidates in INTEGRAL SPI-ACS,prompt observation
- LIGO/Virgo S190828l: No counterpart candidates in INTEGRAL SPI-ACS prompt observation
- LIGO/Virgo S190828j: No counterpart candidates in INTEGRAL SPI-ACS prompt observation
- Fermi GBM-190816: Location-dependent upper limits from INTEGRAL/SPI-ACS prompt observation
- IceCube-190819A: No counterpart candidates in INTEGRAL SPI-ACS prompt observation
- HAWC-190806A: upper limits from INTEGRAL SPI-ACS and IBIS prompt observation
- IceCube 190730A: one weakly associated counterpart candidates in INTEGRAL SPI-ACS, and IBIS prompt observation
- Fermi-LAT Gamma-ray Observations of IceCube-190712A
- Fermi-LAT Gamma-ray Observations of IceCube-190504A
- LIGO/Virgo S190426c: Fermi-LAT search for a high-energy gamma-ray counterpart
- LIGO/Virgo S190425z: Las Cumbres Observatory Galaxy Targeted Counterpart Search
- INTEGRAL observations of the events in the GWTC-1 catalog
- GRB 181201A: a long GRB detected by INTEGRAL
- GRB 180809A: further Swift/XRT observations
- GRB 180701A/MAXI J2119-045: CALET Gamma-Ray Burst Monitor data search
- GRB 180728A: VLT/X-shooter redshift of a nearby energetic GRB
- GRB 180701A: MAXI/GSC detection
- LIGO/Virgo G298048: Chandra X-ray Update on GW170817
- LIGO/Virgo G298048: Discovery of X-ray emission from SSS17a in NGC4993
- LIGO/Virgo G298936: Astrosat CZTI upper limits
- LIGO/Virgo G298048: INTEGRAL pointed follow-up observations
- LIGO/Virgo G298048: Chandra X-ray observations
- GRB170730A detecetd by INTEGRAL. Refined analysis
- LIGO/Virgo G275697: DLT40 follow-up observation
- LIGO/Virgo G268556/GW170104: Lomonosov BDRG observations
- Swift-BAT refined analysis of the recent outburst from SGR 1617-5103 (a.k.a. 1E 161348-5055 and 2E 1613.5-5053)
- GRB 160401A: a long GRB detected by INTEGRAL
- LIGO/Virgo G184098: Fermi-GBM ground-based follow-up
- GRB 150912A: A long GRB detected by INTEGRAL
- SGR 1E 1841-045 (Swift trigger 649113): Terskol upper limit
- Fermi GBM triggers bn150715759 and bn150715817 are not due to GRBs
- Trigger 649113: Swift detection of SGR 1E 1841-045
- Swift trigger 642453 is not an astrophysical source
- GRB 140710B: a long GRB detected with INTEGRAL
- GRB 140705A / SGR 1935+2154: Probable association with supernova remnant G57.2+0.8
- Swift detection of a bright X-ray source in M31
- GRB 131108A: AGILE/GRID observation
- Observation of possible GRB/TDE 130925A by INTEGRAL/SPI-ACS: three activity episodes
- IPN Triangulation of SGR-like burst 130913 - probable association with SGR/AXP 1E1841-045