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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').

307 results found.

  1. IceCube-250330A: Upper limits from a search for additional neutrino events in IceCube
  2. IceCube-250309A: Upper limits from a search for additional neutrino events in IceCube
  3. IceCube-250302A: Upper limits from a search for additional neutrino events in IceCube
  4. IceCube-Cascade 250215A: Upper limits from a search for additional neutrino events in IceCube
  5. LIGO/Virgo/KAGRA S250206dm: No counterpart candidates in INTEGRAL SPI-ACS prompt observation
  6. IceCube-250102A: Upper limits from a search for additional neutrino events in IceCube
  7. Fermi GRB 241209A: Global MASTER-Net observations report
  8. Fermi Gamma-ray Burst Monitor trigger 755277791/241207641 is not a GRB
  9. GRB 241130A: EIRSAT-1 GMOD Detection
  10. IceCube-241127A: Upper limits from a search for additional neutrino events in IceCube
  11. LIGO/Virgo/KAGRA S241125n: No counterpart candidates in INTEGRAL SPI-ACS prompt observation, comparisong with Swift/BAT counterpart
  12. EP241113a: Swift XRT weak detection
  13. IceCube-241113A: Upper limits from a search for additional neutrino events in IceCube
  14. SVOM/GRM detection of a short burst from SGR 1E1841-045
  15. INTEGRAL detection of a burst from 1E 1841-045
  16. EP241107a: EP on-board trigger and autonomous follow-up observation
  17. EP241025a (GRB 241025A): EP observations update
  18. GRB241017A: TOO Observations by SVOM/MXT
  19. IceCube-241006A: Upper limits from a search for additional neutrino events in IceCube
  20. Insight-HXMT ToO observations of X-ray bursts from SGR 1E 1841-045 / Kes 73
  21. SGR 1E 1841-045 / Kes 73: SVOM/GRM observation
  22. SGR 1E 1841-045 / Kes 73 (Trigger 1249878): Osservatorio Atronomico Nastro Verde optical upper limit
  23. SGR 1E 1841-045 / Kes 73 (Trigger 1249653) - Osservatorio Astronomico Nastro Verde upper limit
  24. SGR 1E 1841-045 / Kes 73: Leavitt Observatory optical upper limit
  25. SGR 1E 1841-045 / Kes 73: Montarrenti Observatory optical upper limits
  26. GECAM-B observation of a short burst from SGR 1E 1841-045 / Kes 73
  27. Fermi-GBM Observations of the reactivation of SGR 1E 1841-045 / Kes 73
  28. Trigger 1249878: Swift detection of another burst from SGR 1E 1841-045 / Kes 73
  29. Trigger 1249653: Swift detection of SGR 1E 1841-045 / Kes 73
  30. Fermi trigger No 738348224: Global MASTER-Net observations report
  31. IceCube-Cascade 240518A: Upper limits from a search for additional neutrino events in IceCube
  32. LIGO/Virgo S240422ed: No counterpart candidates in INTEGRAL SPI-ACS prompt observation
  33. IceCube-Cascade 240416A: Upper limits from a search for additional neutrino events in IceCube
  34. IceCube-240412A: Upper limits from a search for additional neutrino events in IceCube
  35. IceCube-240327A: Upper limits from a search for additional neutrino events in IceCube
  36. IceCube-240229A: Upper limits from a search for additional neutrino events in IceCube
  37. IceCube-240204A: Upper limits from a search for additional neutrino events in IceCube
  38. IceCube-240123A: Upper limits from a search for additional neutrino events in IceCube
  39. GRB 240106A: Glowbug gamma-ray detection
  40. IceCube-240105A: Upper limits from a search for additional neutrino events in IceCube
  41. IceCube-231211A: Upper limits from a search for additional neutrino events in IceCube
  42. LIGO/Virgo/KAGRA S231014r: Identification of a GW compact binary merger candidate
  43. LIGO/Virgo S230802aq: No counterpart candidates in INTEGRAL SPI-ACS prompt observation
  44. IceCube-230727A: Upper limits from a search for additional neutrino events in IceCube
  45. IceCube-230725A: Upper limits from a search for additional neutrino events in IceCube
  46. IceCube-230708A: Upper limits from a search for additional neutrino events in IceCube
  47. IceCube-230707B: Upper limits from a search for additional neutrino events in IceCube
  48. LIGO/Virgo/KAGRA S230527c: No counterpart candidates in INTEGRAL SPI-ACS prompt observation
  49. IceCube-Cascade 230610A: Upper limits from a search for additional neutrino events in IceCube
  50. LIGO/Virgo/KAGRA S230609u: Identification of a GW compact binary merger candidate
  51. LIGO/Virgo/KAGRA S230529ay: No counterpart candidates in INTEGRAL SPI-ACS prompt observation
  52. LIGO/Virgo/KAGRA S230518h: Upper limits from Glowbug gamma-ray observations
  53. LIGO/Virgo S230518h: No counterpart candidates in INTEGRAL SPI-ACS prompt observation
  54. IceCube-Cascade 230511A: Upper limits from a search for additional neutrino events in IceCube
  55. IceCube-Cascade 230430A: Upper limits from a search for additional neutrino events in IceCube
  56. IceCube-230416A: Upper limits from a search for additional neutrino events in IceCube
  57. IceCube-230405A: Upper limits from a search for additional neutrino events in IceCube
  58. INTEGRAL detection of a burst from SGR 1806-200
  59. GRB 230307A: soft X-ray detection with LEIA
  60. GRB 230307A: GECAM detection of an extremely bright burst
  61. IceCube-230220A: Upper limits from a search for additional neutrino events in IceCube
  62. IceCube-230201A: Upper limits from a search for additional neutrino events in IceCube
  63. IceCube-230122A: Upper limits from a search for additional neutrino events in IceCube
  64. Fermi-LAT gamma-ray observations of IceCube-230112A
  65. IceCube-221229A: Upper limits from a search for additional neutrino events in IceCube
  66. Fermi-LAT gamma-ray observations of IceCube-221223A
  67. IceCube-221216A: Upper limits from a search for additional neutrino events in IceCube
  68. IceCube-221124A: Upper limits from a search for additional neutrino events in IceCube
  69. IceCube-221104A: Upper limits from a search for additional neutrino events in IceCube
  70. Konus-Wind observation of the recent SGR 1935+2154 activity
  71. INTEGRAL detection of a burst from SGR J1935+2154
  72. IceCube-220928A: Upper limits from a search for additional neutrino events in IceCube
  73. IceCube-Cascade 220826A: Upper limits from a search for additional neutrino events in IceCube
  74. IceCube-220629A: Upper limits from a search for additional neutrino events in IceCube
  75. IceCube-220627A: Upper limits from a search for additional neutrino events in IceCube
  76. IceCube-Cascade 220625A: Upper limits from a search for additional neutrino events in IceCube
  77. IceCube-220509A: Upper limits from a search for additional neutrino events in IceCube
  78. IceCube-220425A: Upper limits from a search for additional neutrino events in IceCube
  79. IceCube-220424A: Upper limits from a search for additional neutrino events in IceCube
  80. IceCube-220421A: Upper limits from a search for additional neutrino events in IceCube
  81. IceCube-220317A: Upper limits from a search for additional neutrino events in IceCube
  82. IceCube-220306A: Upper limits from a search for additional neutrino events in IceCube
  83. IceCube-220303A: Upper limits from a search for additional neutrino events in IceCube
  84. GRB 220228A: Fermi-LAT detection
  85. GRB 220101A: The first example of a Petanova
  86. IceCube-220205A: Upper limits from a search for additional neutrino events in IceCube
  87. IceCube-211216A: Upper limits from a search for additional neutrino events in IceCube
  88. IceCube-211216A: No counterpart candidates in INTEGRAL SPI-ACS and IBIS prompt observation
  89. IceCube-211208A: Upper limits from a search for additional neutrino events in IceCube
  90. IceCube-211208A: No counterpart candidates in INTEGRAL SPI-ACS and IBIS prompt observation
  91. IceCube-Cascade 211128A: Upper limits from a search for additional neutrino events in IceCube
  92. IceCube-211125A: No counterpart candidates in INTEGRAL SPI-ACS and IBIS prompt observation
  93. IceCube-211123A: Upper limits from a search for additional neutrino events in IceCube
  94. HAWC-211123A: No counterpart candidates in INTEGRAL SPI-ACS and IBIS prompt observation
  95. Konus-Wind observation of the recent SGR 1935+2154 activity
  96. IceCube-210730A: No counterpart candidates in INTEGRAL SPI-ACS and IBIS prompt observation
  97. IceCube-210717A: No counterpart candidates in INTEGRAL SPI-ACS and IBIS prompt observation
  98. INTEGRAL detection of a burst from SGR 1935+2154
  99. IceCube-210516A: No counterpart candidates in INTEGRAL SPI-ACS and IBIS prompt observation
  100. IceCube-210510A: No counterpart candidates in INTEGRAL SPI-ACS and IBIS prompt observation

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