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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"

901 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. GRB 260802A / EP J223759.5+531421: SVOM/VT optical upper limit
  9. IceCube-260708A: Upper limits from a search for additional neutrino events in IceCube
  10. Konus-Wind detection of a burst from SGR 1E1841-045 on 2026 May 2
  11. GRB 260504B: SVOM/MXT refined analysis and potential detection
  12. SVOM/GRM observation of a bright burst from SGR 1E1841-045
  13. IPN triangulation of a bright burst from SGR 1E1841-045
  14. The EP-WXT trigger 01709259621 is likely a flaring star
  15. The EP-WXT trigger 01709259615 is likely a flaring star
  16. IceCube-260217A: Upper limits from a search for additional neutrino events in IceCube
  17. IceCube-260125A: Upper limits from a search for additional neutrino events in IceCube
  18. IceCube-260115A: Upper limits from a search for additional neutrino events in IceCube
  19. GRB 251219A: GECAM-B detection of a possible magnetar X-ray burst from SGR 1830-0645
  20. The EP-WXT trigger 01709248783 is likely a flaring star
  21. LIGO/Virgo/KAGRA S251112cm: Upper limits from Glowbug gamma-ray observations
  22. LIGO/Virgo/KAGRA S251112cm: NED Galaxies in the 4-Update Localization Volume
  23. IceCube-251025A: Upper limits from a search for additional neutrino events in IceCube
  24. Upper limits from a search for additional neutrino events in IceCube
  25. IceCube-250926A: Upper limits from a search for additional neutrino events in IceCube
  26. IceCube-250831A: Upper limits from a search for additional neutrino events in IceCube
  27. GRB 250815A: Fermi GBM Final Localization
  28. IceCube-250813A: Upper limits from a search for additional neutrino events in IceCube
  29. The EP-WXT trigger 01709198251 is likely a flaring star
  30. Swift detection of the Soft Gamma Repeater PSR J1647-4552
  31. EP250702a/ GRB 250702B: NuSTAR X-ray Observations
  32. GRB 250706B: refined SVOM/MXT data analysis
  33. Fermi Gamma-ray Burst Monitor trigger 772838080/250628885 is not a GRB
  34. GRB 250621B: SVOM/GRM detection of a possible magnetar X-ray burst
  35. The EP-WXT trigger 01709179071 is likely a flaring star
  36. The EP-WXT trigger 01709178975 is likely a flaring star
  37. GRB 250507A: refined SVOM/MXT data analysis
  38. IceCube-250416A: Upper limits from a search for additional neutrino events in IceCube
  39. GRB 250331C: Swift/UVOT Upper Limits
  40. IceCube-250330A: Upper limits from a search for additional neutrino events in IceCube
  41. IceCube-250309A: Upper limits from a search for additional neutrino events in IceCube
  42. IceCube-250302A: Upper limits from a search for additional neutrino events in IceCube
  43. IceCube-Cascade 250215A: Upper limits from a search for additional neutrino events in IceCube
  44. LIGO/Virgo/KAGRA S250206dm: No counterpart candidates in INTEGRAL SPI-ACS prompt observation
  45. GECAM-A detection of a bright burst from SGR 1E1841-045
  46. Konus-Wind detection of a bright burst from SGR 1E1841-045 on 2025 January 23
  47. IPN triangulation of a bright burst from SGR 1E1841-045
  48. GRB 250116A: GECAM-B detection of a long burst
  49. IceCube-250102A: Upper limits from a search for additional neutrino events in IceCube
  50. Fermi Gamma-ray Burst Monitor trigger 755277791/241207641 is not a GRB
  51. GRB 241130A: EIRSAT-1 GMOD Detection
  52. IceCube-241127A: Upper limits from a search for additional neutrino events in IceCube
  53. SVOM/GRM observation of GRB 241126B or a short burst from magnetar
  54. SVOM/GRM detection of a short burst from SGR 1830
  55. GECAM detection of a short burst from SGR 1830
  56. LIGO/Virgo/KAGRA S241125n: No counterpart candidates in INTEGRAL SPI-ACS prompt observation, comparisong with Swift/BAT counterpart
  57. EP241113a: Swift XRT weak detection
  58. IceCube-241113A: Upper limits from a search for additional neutrino events in IceCube
  59. SVOM/GRM detection of a short burst from SGR 1E1841-045
  60. INTEGRAL detection of a burst from 1E 1841-045
  61. EP241107a: EP on-board trigger and autonomous follow-up observation
  62. EP241025a (GRB 241025A): EP observations update
  63. GRB241017A: TOO Observations by SVOM/MXT
  64. IceCube-241006A: Upper limits from a search for additional neutrino events in IceCube
  65. SVOM/GRM detection of a burst from SGR Swift J1818.0-1607
  66. Insight-HXMT ToO observations of X-ray bursts from SGR 1E 1841-045 / Kes 73
  67. GRB 240914A : An intermediate duration GRB located on-board by SVOM/ECLAIRs.
  68. SGR 1E 1841-045 / Kes 73: SVOM/GRM observation
  69. SGR 1E 1841-045 / Kes 73 (Trigger 1249878): Osservatorio Atronomico Nastro Verde optical upper limit
  70. SGR 1E 1841-045 / Kes 73 (Trigger 1249653) - Osservatorio Astronomico Nastro Verde upper limit
  71. GRB 240824A: Swift/UVOT Upper Limits
  72. SGR 1E 1841-045 / Kes 73: Leavitt Observatory optical upper limit
  73. SGR 1E 1841-045 / Kes 73: Montarrenti Observatory optical upper limits
  74. GECAM-B observation of a short burst from SGR 1E 1841-045 / Kes 73
  75. Fermi-GBM Observations of the reactivation of SGR 1E 1841-045 / Kes 73
  76. Trigger 1249878: Swift detection of another burst from SGR 1E 1841-045 / Kes 73
  77. Trigger 1249653: Swift detection of SGR 1E 1841-045 / Kes 73
  78. IceCube-Cascade 240518A: Upper limits from a search for additional neutrino events in IceCube
  79. LIGO/Virgo S240422ed: No counterpart candidates in INTEGRAL SPI-ACS prompt observation
  80. IceCube-Cascade 240416A: Upper limits from a search for additional neutrino events in IceCube
  81. IceCube-240412A: Upper limits from a search for additional neutrino events in IceCube
  82. IceCube-240327A: Upper limits from a search for additional neutrino events in IceCube
  83. IceCube-240229A: Upper limits from a search for additional neutrino events in IceCube
  84. IceCube-240204A: Upper limits from a search for additional neutrino events in IceCube
  85. IceCube-240123A: Upper limits from a search for additional neutrino events in IceCube
  86. IPN triangulation of GRB 240112A (long)
  87. GRB 240112A: GECAM detection of a burst
  88. GRB 240106A: Glowbug gamma-ray detection
  89. IceCube-240105A: Upper limits from a search for additional neutrino events in IceCube
  90. IceCube-231211A: Upper limits from a search for additional neutrino events in IceCube
  91. GRB 231115A: GBM/Fermi Observations of a probable Giant Flare of Magnetar
  92. GECAM-B observation of a short burst from SGR J1555-5402
  93. SGRJ1555-5402: Swift/BAT-GUANO arcminute localization of a SGR flare
  94. Fermi GRB 231108A: Global MASTER-Net observations report
  95. LIGO/Virgo/KAGRA S231014r: Identification of a GW compact binary merger candidate
  96. LIGO/Virgo S230802aq: No counterpart candidates in INTEGRAL SPI-ACS prompt observation
  97. IceCube-230727A: Upper limits from a search for additional neutrino events in IceCube
  98. IceCube-230725A: Upper limits from a search for additional neutrino events in IceCube
  99. IceCube-230708A: Upper limits from a search for additional neutrino events in IceCube
  100. IceCube-230707B: Upper limits from a search for additional neutrino events in IceCube

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