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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').
Advanced Search

To narrow the search results, use advanced search syntax. This allows for specifying which circular field to search (submitter, subject, and/or body). For additional information, refer to the advanced search documentation.

Advanced Search Examples (click to copy):

subject:"Swift"
body:"GRB"
submitter:"Judith Racusin"

900 results found.

  1. IceCube-Cascade 230610A: Upper limits from a search for additional neutrino events in IceCube
  2. LIGO/Virgo/KAGRA S230609u: Identification of a GW compact binary merger candidate
  3. LIGO/Virgo/KAGRA S230529ay: No counterpart candidates in INTEGRAL SPI-ACS prompt observation
  4. LIGO/Virgo/KAGRA S230518h: Upper limits from Glowbug gamma-ray observations
  5. LIGO/Virgo S230518h: No counterpart candidates in INTEGRAL SPI-ACS prompt observation
  6. IceCube-Cascade 230511A: Upper limits from a search for additional neutrino events in IceCube
  7. IceCube-Cascade 230430A: Upper limits from a search for additional neutrino events in IceCube
  8. IceCube-230416A: Upper limits from a search for additional neutrino events in IceCube
  9. IceCube-230405A: Upper limits from a search for additional neutrino events in IceCube
  10. SGR 1806-20: Correction to GCN 33494
  11. INTEGRAL detection of a burst from SGR 1806-200
  12. VZLUSAT-2 detection of SGR 1806-20
  13. GRB 230307A: soft X-ray detection with LEIA
  14. Trigger 1159327: Swift detection of SGR1806-20
  15. GRB 230307A: GECAM detection of an extremely bright burst
  16. IceCube-230220A: Upper limits from a search for additional neutrino events in IceCube
  17. IceCube-230201A: Upper limits from a search for additional neutrino events in IceCube
  18. IceCube-230122A: Upper limits from a search for additional neutrino events in IceCube
  19. Fermi-LAT gamma-ray observations of IceCube-230112A
  20. IceCube-221229A: Upper limits from a search for additional neutrino events in IceCube
  21. Fermi-LAT gamma-ray observations of IceCube-221223A
  22. IceCube-221216A: Upper limits from a search for additional neutrino events in IceCube
  23. Konus-Wind detection of a burst from SGR 1935+2154 on 2022 December 13
  24. IceCube-221124A: Upper limits from a search for additional neutrino events in IceCube
  25. Konus-Wind detection of a burst from SGR 1935+2154 on 2022 November 9
  26. Fermi-GBM Observations of High Bursting Activity from SGR J1935+2154
  27. IceCube-221104A: Upper limits from a search for additional neutrino events in IceCube
  28. SGR 1935+2154: AstroSat CZTI Detections
  29. Fermi Gamma-ray Burst Monitor detections of SGR 1935+2154
  30. SGR 1935+21542: VZLUSAT-2 and GRBAlpha joint detection
  31. AGILE detection of a burst from SGR J1935+2154 reported by VZLUSAT-2
  32. SGR 1935+2154: Bursting activity detected by VZLUSAT-2
  33. AGILE detection of the 2022 October 17 burst from SGR J1935+2154 reported by Konus-Wind
  34. SGR 1935+2154: Detection by GRBAlpha
  35. Konus-Wind detection of a burst from SGR 1935+2154 on 2022 October 17
  36. AGILE detection of short X-ray flaring activity contemporary to SGR J1935+2154 reported bursts
  37. Konus-Wind detection of a short burst coincident with a bright radio burst from SGR 1935+2154
  38. Konus-Wind observation of the recent SGR 1935+2154 activity
  39. Fermi Gamma-ray Burst Monitor detections of SGR 1935+2154
  40. Fermi Gamma-ray Burst Monitor continues to detect SGR 1935+2154
  41. Fermi-GBM Observations of High Bursting Activity from SGR J1935+2154
  42. INTEGRAL shows increasing activity in SGR J1935+2154
  43. INTEGRAL detection of a burst from SGR J1935+2154
  44. INTEGRAL detection of a burst from SGR J1935+2154
  45. Fermi GBM trigger 686350260/221001869 is not a GRB
  46. IceCube-220928A: Upper limits from a search for additional neutrino events in IceCube
  47. IceCube-Cascade 220826A: Upper limits from a search for additional neutrino events in IceCube
  48. IceCube-220629A: Upper limits from a search for additional neutrino events in IceCube
  49. IceCube-220627A: Upper limits from a search for additional neutrino events in IceCube
  50. IceCube-Cascade 220625A: Upper limits from a search for additional neutrino events in IceCube
  51. Konus-Wind detection of an intermediate flare from SGR 1935+2154 on June 16
  52. Trigger 1108538: Swift detection of a burst from SGR J1935+2154
  53. Konus-Wind detection of a burst from SGR 1935+2154 on 2022 May 25
  54. GRB 220518A: Swift/UVOT Detection
  55. IceCube-220509A: Upper limits from a search for additional neutrino events in IceCube
  56. IceCube-220425A: Upper limits from a search for additional neutrino events in IceCube
  57. IceCube-220424A: Upper limits from a search for additional neutrino events in IceCube
  58. IceCube-220421A: Upper limits from a search for additional neutrino events in IceCube
  59. IceCube-220317A: Upper limits from a search for additional neutrino events in IceCube
  60. IceCube-220306A: Upper limits from a search for additional neutrino events in IceCube
  61. IceCube-220303A: Upper limits from a search for additional neutrino events in IceCube
  62. GRB 220228A: Fermi-LAT detection
  63. GRB 220101A: The first example of a Petanova
  64. GRB 220211A: redshift lower limit estimating
  65. Fermi GBM trigger 666393834/220212892 is not a GRB
  66. IceCube-220205A: Upper limits from a search for additional neutrino events in IceCube
  67. GECAM observations of a series of bursts from SGR J1935+2154
  68. AGILE observations of a bright burst from SGR 1935+2154
  69. Konus-Wind detection of an intermediate flare from SGR 1935+2154 on January 20
  70. IPN triangulation of a bright burst from SGR 1935+2154
  71. Konus-Wind observation of the recent SGR 1935+2154 activity
  72. GECAM observations of a series of bursts from SGR J1935+2154
  73. GECAM observations of a series of bursts from SGR J1935+2154
  74. Fermi-GBM Observations of Recent Bursting Activity from SGR J1935+2154
  75. AGILE observations of a burst from SGR 1935+2154
  76. GECAM observations of a series of bursts from SGR J1935+2154
  77. Fermi Gamma-ray Burst Monitor trigger 220111325/663580106 is not a GRB
  78. GECAM observations of a series of bursts from SGR J1935+2154
  79. GECAM observation of a burst from SGR J1555.2-5402
  80. GECAM detection of a short burst from SGR 1935+2154
  81. GECAM observations of a series of bursts from SGR J1935+2154
  82. GRB 211229A: GECAM detection
  83. Konus-Wind detection of the intermediate flare from SGR 1935+2154
  84. AGILE observations of a bright burst from SGR 1935+2154
  85. IceCube-211216A: Upper limits from a search for additional neutrino events in IceCube
  86. IceCube-211216A: No counterpart candidates in INTEGRAL SPI-ACS and IBIS prompt observation
  87. IceCube-211208A: Upper limits from a search for additional neutrino events in IceCube
  88. IceCube-211208A: No counterpart candidates in INTEGRAL SPI-ACS and IBIS prompt observation
  89. IceCube-Cascade 211128A: Upper limits from a search for additional neutrino events in IceCube
  90. IceCube-211125A: No counterpart candidates in INTEGRAL SPI-ACS and IBIS prompt observation
  91. IceCube-211123A: Upper limits from a search for additional neutrino events in IceCube
  92. HAWC-211123A: No counterpart candidates in INTEGRAL SPI-ACS and IBIS prompt observation
  93. GECAM detection of a short burst probably from SGR J1555.2-5402
  94. Fermi Gamma-ray Burst Monitor trigger 211008665/655401471 is not a GRB
  95. GECAM observation of a burst from SGR J1555.2-5402
  96. SGR 1935+2154: Swift/BAT-GUANO detection and arcminute localization
  97. GECAM observations of a series of bursts from SGR J1935+2154 (2021-09-15T14 to 2021-09-23T14)
  98. Konus-Wind detection of a burst from SGR 1935+2154 on 2021 September 22
  99. GECAM observations of bursts from SGR J1935+2154 (2021-09-13T01 to 2021-09-15T14)
  100. Konus-Wind observation of the recent SGR 1935+2154 activity

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