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GCN Circulars

GCN Circulars are rapid bulletins submitted by and distributed to the community. 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"

351 results found.

  1. IceCube-261012A: Upper limits from a search for additional neutrino events in IceCube
  2. IceCube-260919A: Upper limits from a search for additional neutrino events in IceCube
  3. IceCube-260916A: Upper limits from a search for additional neutrino events in IceCube
  4. IceCube-260827A: Upper limits from a search for additional neutrino events in IceCube
  5. IceCube-260821A: Upper limits from a search for additional neutrino events in IceCube
  6. GRB 260317A: SVOM/ECLAIRs detection through offline targeted search and its possible association to magnetar 1E 1841-04.5
  7. IceCube-Cascade 260801A: Upper limits from a search for additional neutrino events in IceCube
  8. IceCube-260708A: Upper limits from a search for additional neutrino events in IceCube
  9. Konus-Wind detection of a burst from SGR 1E1841-045 on 2026 May 2
  10. GRB 260504B: SVOM/MXT refined analysis and potential detection
  11. SVOM/GRM observation of a bright burst from SGR 1E1841-045
  12. IPN triangulation of a bright burst from SGR 1E1841-045
  13. The EP-WXT trigger 01709259621 is likely a flaring star
  14. The EP-WXT trigger 01709259615 is likely a flaring star
  15. IceCube-260217A: Upper limits from a search for additional neutrino events in IceCube
  16. IceCube-260125A: Upper limits from a search for additional neutrino events in IceCube
  17. IceCube-260115A: Upper limits from a search for additional neutrino events in IceCube
  18. The EP-WXT trigger 01709248783 is likely a flaring star
  19. LIGO/Virgo/KAGRA S251112cm: Upper limits from Glowbug gamma-ray observations
  20. LIGO/Virgo/KAGRA S251112cm: NED Galaxies in the 4-Update Localization Volume
  21. IceCube-251025A: Upper limits from a search for additional neutrino events in IceCube
  22. Upper limits from a search for additional neutrino events in IceCube
  23. IceCube-250926A: Upper limits from a search for additional neutrino events in IceCube
  24. IceCube-250831A: Upper limits from a search for additional neutrino events in IceCube
  25. IceCube-250813A: Upper limits from a search for additional neutrino events in IceCube
  26. EP250702a/ GRB 250702B: NuSTAR X-ray Observations
  27. GRB 250706B: refined SVOM/MXT data analysis
  28. The EP-WXT trigger 01709179071 is likely a flaring star
  29. The EP-WXT trigger 01709178975 is likely a flaring star
  30. GRB 250507A: refined SVOM/MXT data analysis
  31. IceCube-250416A: Upper limits from a search for additional neutrino events in IceCube
  32. GRB 250331C: Swift/UVOT Upper Limits
  33. IceCube-250330A: Upper limits from a search for additional neutrino events in IceCube
  34. IceCube-250309A: Upper limits from a search for additional neutrino events in IceCube
  35. IceCube-250302A: Upper limits from a search for additional neutrino events in IceCube
  36. IceCube-Cascade 250215A: Upper limits from a search for additional neutrino events in IceCube
  37. LIGO/Virgo/KAGRA S250206dm: No counterpart candidates in INTEGRAL SPI-ACS prompt observation
  38. GECAM-A detection of a bright burst from SGR 1E1841-045
  39. Konus-Wind detection of a bright burst from SGR 1E1841-045 on 2025 January 23
  40. IPN triangulation of a bright burst from SGR 1E1841-045
  41. IceCube-250102A: Upper limits from a search for additional neutrino events in IceCube
  42. Fermi Gamma-ray Burst Monitor trigger 755277791/241207641 is not a GRB
  43. GRB 241130A: EIRSAT-1 GMOD Detection
  44. IceCube-241127A: Upper limits from a search for additional neutrino events in IceCube
  45. LIGO/Virgo/KAGRA S241125n: No counterpart candidates in INTEGRAL SPI-ACS prompt observation, comparisong with Swift/BAT counterpart
  46. EP241113a: Swift XRT weak detection
  47. IceCube-241113A: Upper limits from a search for additional neutrino events in IceCube
  48. SVOM/GRM detection of a short burst from SGR 1E1841-045
  49. INTEGRAL detection of a burst from 1E 1841-045
  50. EP241107a: EP on-board trigger and autonomous follow-up observation
  51. EP241025a (GRB 241025A): EP observations update
  52. GRB241017A: TOO Observations by SVOM/MXT
  53. IceCube-241006A: Upper limits from a search for additional neutrino events in IceCube
  54. Insight-HXMT ToO observations of X-ray bursts from SGR 1E 1841-045 / Kes 73
  55. SGR 1E 1841-045 / Kes 73: SVOM/GRM observation
  56. SGR 1E 1841-045 / Kes 73 (Trigger 1249878): Osservatorio Atronomico Nastro Verde optical upper limit
  57. SGR 1E 1841-045 / Kes 73 (Trigger 1249653) - Osservatorio Astronomico Nastro Verde upper limit
  58. GRB 240824A: Swift/UVOT Upper Limits
  59. SGR 1E 1841-045 / Kes 73: Leavitt Observatory optical upper limit
  60. SGR 1E 1841-045 / Kes 73: Montarrenti Observatory optical upper limits
  61. GECAM-B observation of a short burst from SGR 1E 1841-045 / Kes 73
  62. Fermi-GBM Observations of the reactivation of SGR 1E 1841-045 / Kes 73
  63. Trigger 1249878: Swift detection of another burst from SGR 1E 1841-045 / Kes 73
  64. Trigger 1249653: Swift detection of SGR 1E 1841-045 / Kes 73
  65. IceCube-Cascade 240518A: Upper limits from a search for additional neutrino events in IceCube
  66. LIGO/Virgo S240422ed: No counterpart candidates in INTEGRAL SPI-ACS prompt observation
  67. IceCube-Cascade 240416A: Upper limits from a search for additional neutrino events in IceCube
  68. IceCube-240412A: Upper limits from a search for additional neutrino events in IceCube
  69. IceCube-240327A: Upper limits from a search for additional neutrino events in IceCube
  70. IceCube-240229A: Upper limits from a search for additional neutrino events in IceCube
  71. IceCube-240204A: Upper limits from a search for additional neutrino events in IceCube
  72. IceCube-240123A: Upper limits from a search for additional neutrino events in IceCube
  73. GRB 240106A: Glowbug gamma-ray detection
  74. IceCube-240105A: Upper limits from a search for additional neutrino events in IceCube
  75. IceCube-231211A: Upper limits from a search for additional neutrino events in IceCube
  76. Fermi GRB 231108A: Global MASTER-Net observations report
  77. LIGO/Virgo/KAGRA S231014r: Identification of a GW compact binary merger candidate
  78. LIGO/Virgo S230802aq: No counterpart candidates in INTEGRAL SPI-ACS prompt observation
  79. IceCube-230727A: Upper limits from a search for additional neutrino events in IceCube
  80. IceCube-230725A: Upper limits from a search for additional neutrino events in IceCube
  81. IceCube-230708A: Upper limits from a search for additional neutrino events in IceCube
  82. IceCube-230707B: Upper limits from a search for additional neutrino events in IceCube
  83. LIGO/Virgo/KAGRA S230527c: No counterpart candidates in INTEGRAL SPI-ACS prompt observation
  84. IceCube-Cascade 230610A: Upper limits from a search for additional neutrino events in IceCube
  85. LIGO/Virgo/KAGRA S230609u: Identification of a GW compact binary merger candidate
  86. LIGO/Virgo/KAGRA S230529ay: No counterpart candidates in INTEGRAL SPI-ACS prompt observation
  87. LIGO/Virgo/KAGRA S230518h: Upper limits from Glowbug gamma-ray observations
  88. LIGO/Virgo S230518h: No counterpart candidates in INTEGRAL SPI-ACS prompt observation
  89. IceCube-Cascade 230511A: Upper limits from a search for additional neutrino events in IceCube
  90. IceCube-Cascade 230430A: Upper limits from a search for additional neutrino events in IceCube
  91. IceCube-230416A: Upper limits from a search for additional neutrino events in IceCube
  92. IceCube-230405A: Upper limits from a search for additional neutrino events in IceCube
  93. INTEGRAL detection of a burst from SGR 1806-200
  94. GRB 230307A: soft X-ray detection with LEIA
  95. GRB 230307A: GECAM detection of an extremely bright burst
  96. IceCube-230220A: Upper limits from a search for additional neutrino events in IceCube
  97. IceCube-230201A: Upper limits from a search for additional neutrino events in IceCube
  98. IceCube-230122A: Upper limits from a search for additional neutrino events in IceCube
  99. Fermi-LAT gamma-ray observations of IceCube-230112A
  100. IceCube-221229A: Upper limits from a search for additional neutrino events in IceCube

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