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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.

Search for Circulars by submitter, subject, or body text (e.g. 'Fermi GRB').
To navigate to a specific circular, enter the associated Circular ID (e.g. 'gcn123', 'Circular 123', or '123').

823 results found.

  1. LIGO/Virgo S240422ed: No counterpart candidates in INTEGRAL SPI-ACS prompt observation
  2. IceCube-Cascade 240416A: Upper limits from a search for additional neutrino events in IceCube
  3. IceCube-240412A: Upper limits from a search for additional neutrino events in IceCube
  4. IceCube-240327A: Upper limits from a search for additional neutrino events in IceCube
  5. IceCube-240229A: Upper limits from a search for additional neutrino events in IceCube
  6. IceCube-240204A: Upper limits from a search for additional neutrino events in IceCube
  7. IceCube-240123A: Upper limits from a search for additional neutrino events in IceCube
  8. IPN triangulation of GRB 240112A (long)
  9. GRB 240112A: GECAM detection of a burst
  10. GRB 240106A: Glowbug gamma-ray detection
  11. IceCube-240105A: Upper limits from a search for additional neutrino events in IceCube
  12. IceCube-231211A: Upper limits from a search for additional neutrino events in IceCube
  13. GRB 231115A: GBM/Fermi Observations of a probable Giant Flare of Magnetar
  14. GECAM-B observation of a short burst from SGR J1555-5402
  15. SGRJ1555-5402: Swift/BAT-GUANO arcminute localization of a SGR flare
  16. Fermi GRB 231108A: Global MASTER-Net observations report
  17. LIGO/Virgo/KAGRA S231014r: Identification of a GW compact binary merger candidate
  18. LIGO/Virgo S230802aq: No counterpart candidates in INTEGRAL SPI-ACS prompt observation
  19. IceCube-230727A: Upper limits from a search for additional neutrino events in IceCube
  20. IceCube-230725A: Upper limits from a search for additional neutrino events in IceCube
  21. IceCube-230708A: Upper limits from a search for additional neutrino events in IceCube
  22. IceCube-230707B: Upper limits from a search for additional neutrino events in IceCube
  23. LIGO/Virgo/KAGRA S230527c: No counterpart candidates in INTEGRAL SPI-ACS prompt observation
  24. IceCube-Cascade 230610A: Upper limits from a search for additional neutrino events in IceCube
  25. LIGO/Virgo/KAGRA S230609u: Identification of a GW compact binary merger candidate
  26. LIGO/Virgo/KAGRA S230529ay: No counterpart candidates in INTEGRAL SPI-ACS prompt observation
  27. LIGO/Virgo/KAGRA S230518h: Upper limits from Glowbug gamma-ray observations
  28. LIGO/Virgo S230518h: No counterpart candidates in INTEGRAL SPI-ACS prompt observation
  29. IceCube-Cascade 230511A: Upper limits from a search for additional neutrino events in IceCube
  30. IceCube-Cascade 230430A: Upper limits from a search for additional neutrino events in IceCube
  31. IceCube-230416A: Upper limits from a search for additional neutrino events in IceCube
  32. IceCube-230405A: Upper limits from a search for additional neutrino events in IceCube
  33. SGR 1806-20: Correction to GCN 33494
  34. INTEGRAL detection of a burst from SGR 1806-200
  35. VZLUSAT-2 detection of SGR 1806-20
  36. GRB 230307A: soft X-ray detection with LEIA
  37. Trigger 1159327: Swift detection of SGR1806-20
  38. GRB 230307A: GECAM detection of an extremely bright burst
  39. IceCube-230220A: Upper limits from a search for additional neutrino events in IceCube
  40. IceCube-230201A: Upper limits from a search for additional neutrino events in IceCube
  41. IceCube-230122A: Upper limits from a search for additional neutrino events in IceCube
  42. Fermi-LAT gamma-ray observations of IceCube-230112A
  43. IceCube-221229A: Upper limits from a search for additional neutrino events in IceCube
  44. Fermi-LAT gamma-ray observations of IceCube-221223A
  45. IceCube-221216A: Upper limits from a search for additional neutrino events in IceCube
  46. Konus-Wind detection of a burst from SGR 1935+2154 on 2022 December 13
  47. IceCube-221124A: Upper limits from a search for additional neutrino events in IceCube
  48. Konus-Wind detection of a burst from SGR 1935+2154 on 2022 November 9
  49. Fermi-GBM Observations of High Bursting Activity from SGR J1935+2154
  50. IceCube-221104A: Upper limits from a search for additional neutrino events in IceCube
  51. SGR 1935+2154: AstroSat CZTI Detections
  52. Fermi Gamma-ray Burst Monitor detections of SGR 1935+2154
  53. SGR 1935+21542: VZLUSAT-2 and GRBAlpha joint detection
  54. AGILE detection of a burst from SGR J1935+2154 reported by VZLUSAT-2
  55. SGR 1935+2154: Bursting activity detected by VZLUSAT-2
  56. AGILE detection of the 2022 October 17 burst from SGR J1935+2154 reported by Konus-Wind
  57. SGR 1935+2154: Detection by GRBAlpha
  58. Konus-Wind detection of a burst from SGR 1935+2154 on 2022 October 17
  59. AGILE detection of short X-ray flaring activity contemporary to SGR J1935+2154 reported bursts
  60. Konus-Wind detection of a short burst coincident with a bright radio burst from SGR 1935+2154
  61. Konus-Wind observation of the recent SGR 1935+2154 activity
  62. Fermi Gamma-ray Burst Monitor detections of SGR 1935+2154
  63. Fermi Gamma-ray Burst Monitor continues to detect SGR 1935+2154
  64. Fermi-GBM Observations of High Bursting Activity from SGR J1935+2154
  65. INTEGRAL shows increasing activity in SGR J1935+2154
  66. INTEGRAL detection of a burst from SGR J1935+2154
  67. INTEGRAL detection of a burst from SGR J1935+2154
  68. Fermi GBM trigger 686350260/221001869 is not a GRB
  69. IceCube-220928A: Upper limits from a search for additional neutrino events in IceCube
  70. IceCube-Cascade 220826A: Upper limits from a search for additional neutrino events in IceCube
  71. IceCube-220629A: Upper limits from a search for additional neutrino events in IceCube
  72. IceCube-220627A: Upper limits from a search for additional neutrino events in IceCube
  73. IceCube-Cascade 220625A: Upper limits from a search for additional neutrino events in IceCube
  74. Konus-Wind detection of an intermediate flare from SGR 1935+2154 on June 16
  75. Trigger 1108538: Swift detection of a burst from SGR J1935+2154
  76. Konus-Wind detection of a burst from SGR 1935+2154 on 2022 May 25
  77. GRB 220518A: Swift/UVOT Detection
  78. IceCube-220509A: Upper limits from a search for additional neutrino events in IceCube
  79. IceCube-220425A: Upper limits from a search for additional neutrino events in IceCube
  80. IceCube-220424A: Upper limits from a search for additional neutrino events in IceCube
  81. IceCube-220421A: Upper limits from a search for additional neutrino events in IceCube
  82. IceCube-220317A: Upper limits from a search for additional neutrino events in IceCube
  83. IceCube-220306A: Upper limits from a search for additional neutrino events in IceCube
  84. IceCube-220303A: Upper limits from a search for additional neutrino events in IceCube
  85. GRB 220228A: Fermi-LAT detection
  86. GRB 220101A: The first example of a Petanova
  87. GRB 220211A: redshift lower limit estimating
  88. Fermi GBM trigger 666393834/220212892 is not a GRB
  89. IceCube-220205A: Upper limits from a search for additional neutrino events in IceCube
  90. GECAM observations of a series of bursts from SGR J1935+2154
  91. AGILE observations of a bright burst from SGR 1935+2154
  92. Konus-Wind detection of an intermediate flare from SGR 1935+2154 on January 20
  93. IPN triangulation of a bright burst from SGR 1935+2154
  94. Konus-Wind observation of the recent SGR 1935+2154 activity
  95. GECAM observations of a series of bursts from SGR J1935+2154
  96. GECAM observations of a series of bursts from SGR J1935+2154
  97. Fermi-GBM Observations of Recent Bursting Activity from SGR J1935+2154
  98. AGILE observations of a burst from SGR 1935+2154
  99. GECAM observations of a series of bursts from SGR J1935+2154
  100. Fermi Gamma-ray Burst Monitor trigger 220111325/663580106 is not a GRB

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