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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"

334 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. GRB 260504B: SVOM/MXT refined analysis and potential detection
  10. The EP-WXT trigger 01709259621 is likely a flaring star
  11. The EP-WXT trigger 01709259615 is likely a flaring star
  12. IceCube-260217A: Upper limits from a search for additional neutrino events in IceCube
  13. IceCube-260125A: Upper limits from a search for additional neutrino events in IceCube
  14. IceCube-260115A: Upper limits from a search for additional neutrino events in IceCube
  15. The EP-WXT trigger 01709248783 is likely a flaring star
  16. LIGO/Virgo/KAGRA S251112cm: Upper limits from Glowbug gamma-ray observations
  17. IceCube-251025A: Upper limits from a search for additional neutrino events in IceCube
  18. Upper limits from a search for additional neutrino events in IceCube
  19. IceCube-250926A: Upper limits from a search for additional neutrino events in IceCube
  20. IceCube-250831A: Upper limits from a search for additional neutrino events in IceCube
  21. IceCube-250813A: Upper limits from a search for additional neutrino events in IceCube
  22. EP250702a/ GRB 250702B: NuSTAR X-ray Observations
  23. GRB 250706B: refined SVOM/MXT data analysis
  24. The EP-WXT trigger 01709179071 is likely a flaring star
  25. The EP-WXT trigger 01709178975 is likely a flaring star
  26. GRB 250507A: refined SVOM/MXT data analysis
  27. IceCube-250416A: Upper limits from a search for additional neutrino events in IceCube
  28. IceCube-250330A: Upper limits from a search for additional neutrino events in IceCube
  29. IceCube-250309A: Upper limits from a search for additional neutrino events in IceCube
  30. IceCube-250302A: Upper limits from a search for additional neutrino events in IceCube
  31. IceCube-Cascade 250215A: Upper limits from a search for additional neutrino events in IceCube
  32. LIGO/Virgo/KAGRA S250206dm: No counterpart candidates in INTEGRAL SPI-ACS prompt observation
  33. IceCube-250102A: Upper limits from a search for additional neutrino events in IceCube
  34. Fermi GRB 241209A: Global MASTER-Net observations report
  35. Fermi Gamma-ray Burst Monitor trigger 755277791/241207641 is not a GRB
  36. GRB 241130A: EIRSAT-1 GMOD Detection
  37. IceCube-241127A: Upper limits from a search for additional neutrino events in IceCube
  38. LIGO/Virgo/KAGRA S241125n: No counterpart candidates in INTEGRAL SPI-ACS prompt observation, comparisong with Swift/BAT counterpart
  39. EP241113a: Swift XRT weak detection
  40. IceCube-241113A: Upper limits from a search for additional neutrino events in IceCube
  41. SVOM/GRM detection of a short burst from SGR 1E1841-045
  42. INTEGRAL detection of a burst from 1E 1841-045
  43. EP241107a: EP on-board trigger and autonomous follow-up observation
  44. EP241025a (GRB 241025A): EP observations update
  45. GRB241017A: TOO Observations by SVOM/MXT
  46. IceCube-241006A: Upper limits from a search for additional neutrino events in IceCube
  47. Insight-HXMT ToO observations of X-ray bursts from SGR 1E 1841-045 / Kes 73
  48. SGR 1E 1841-045 / Kes 73: SVOM/GRM observation
  49. SGR 1E 1841-045 / Kes 73 (Trigger 1249878): Osservatorio Atronomico Nastro Verde optical upper limit
  50. SGR 1E 1841-045 / Kes 73 (Trigger 1249653) - Osservatorio Astronomico Nastro Verde upper limit
  51. SGR 1E 1841-045 / Kes 73: Leavitt Observatory optical upper limit
  52. SGR 1E 1841-045 / Kes 73: Montarrenti Observatory optical upper limits
  53. GECAM-B observation of a short burst from SGR 1E 1841-045 / Kes 73
  54. Fermi-GBM Observations of the reactivation of SGR 1E 1841-045 / Kes 73
  55. Trigger 1249878: Swift detection of another burst from SGR 1E 1841-045 / Kes 73
  56. Trigger 1249653: Swift detection of SGR 1E 1841-045 / Kes 73
  57. Fermi trigger No 738348224: Global MASTER-Net observations report
  58. IceCube-Cascade 240518A: Upper limits from a search for additional neutrino events in IceCube
  59. LIGO/Virgo S240422ed: No counterpart candidates in INTEGRAL SPI-ACS prompt observation
  60. IceCube-Cascade 240416A: Upper limits from a search for additional neutrino events in IceCube
  61. IceCube-240412A: Upper limits from a search for additional neutrino events in IceCube
  62. IceCube-240327A: Upper limits from a search for additional neutrino events in IceCube
  63. IceCube-240229A: Upper limits from a search for additional neutrino events in IceCube
  64. IceCube-240204A: Upper limits from a search for additional neutrino events in IceCube
  65. IceCube-240123A: Upper limits from a search for additional neutrino events in IceCube
  66. GRB 240106A: Glowbug gamma-ray detection
  67. IceCube-240105A: Upper limits from a search for additional neutrino events in IceCube
  68. IceCube-231211A: Upper limits from a search for additional neutrino events in IceCube
  69. LIGO/Virgo/KAGRA S231014r: Identification of a GW compact binary merger candidate
  70. LIGO/Virgo S230802aq: No counterpart candidates in INTEGRAL SPI-ACS prompt observation
  71. IceCube-230727A: Upper limits from a search for additional neutrino events in IceCube
  72. IceCube-230725A: Upper limits from a search for additional neutrino events in IceCube
  73. IceCube-230708A: Upper limits from a search for additional neutrino events in IceCube
  74. IceCube-230707B: Upper limits from a search for additional neutrino events in IceCube
  75. LIGO/Virgo/KAGRA S230527c: No counterpart candidates in INTEGRAL SPI-ACS prompt observation
  76. IceCube-Cascade 230610A: Upper limits from a search for additional neutrino events in IceCube
  77. LIGO/Virgo/KAGRA S230609u: Identification of a GW compact binary merger candidate
  78. LIGO/Virgo/KAGRA S230529ay: No counterpart candidates in INTEGRAL SPI-ACS prompt observation
  79. LIGO/Virgo/KAGRA S230518h: Upper limits from Glowbug gamma-ray observations
  80. LIGO/Virgo S230518h: No counterpart candidates in INTEGRAL SPI-ACS prompt observation
  81. IceCube-Cascade 230511A: Upper limits from a search for additional neutrino events in IceCube
  82. IceCube-Cascade 230430A: Upper limits from a search for additional neutrino events in IceCube
  83. IceCube-230416A: Upper limits from a search for additional neutrino events in IceCube
  84. IceCube-230405A: Upper limits from a search for additional neutrino events in IceCube
  85. INTEGRAL detection of a burst from SGR 1806-200
  86. GRB 230307A: soft X-ray detection with LEIA
  87. GRB 230307A: GECAM detection of an extremely bright burst
  88. IceCube-230220A: Upper limits from a search for additional neutrino events in IceCube
  89. IceCube-230201A: Upper limits from a search for additional neutrino events in IceCube
  90. IceCube-230122A: Upper limits from a search for additional neutrino events in IceCube
  91. Fermi-LAT gamma-ray observations of IceCube-230112A
  92. IceCube-221229A: Upper limits from a search for additional neutrino events in IceCube
  93. Fermi-LAT gamma-ray observations of IceCube-221223A
  94. IceCube-221216A: Upper limits from a search for additional neutrino events in IceCube
  95. IceCube-221124A: Upper limits from a search for additional neutrino events in IceCube
  96. IceCube-221104A: Upper limits from a search for additional neutrino events in IceCube
  97. Konus-Wind observation of the recent SGR 1935+2154 activity
  98. INTEGRAL detection of a burst from SGR J1935+2154
  99. IceCube-220928A: Upper limits from a search for additional neutrino events in IceCube
  100. IceCube-Cascade 220826A: Upper limits from a search for additional neutrino events in IceCube

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