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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"

24534 results found.

  1. LIGO/Virgo/KAGRA S240413p: STEP - T80S Search and Candidate Counterpart Identification
  2. GRB 240415B: GECAM-B detection
  3. EP 240416a: Xinglong and NOT decaying optical counterpart
  4. GRB 240415A: Swift-BAT refined analysis
  5. EP240416A: MASTER optical observations
  6. GRB 240414A: Swift-BAT refined analysis
  7. EP240416a: Kinder optical counterpart candidate
  8. EP240413a: BOOTES-2/TELMA Optical Upper Limit
  9. GRB 240415A: Fermi GBM Observation
  10. GRB 240414A: GMG observation
  11. EP 240414a: BOOTES-4/MET Optical Upper Limits
  12. EP240414a: EP-FXT follow-up observation
  13. GRB 240415B: Swift/BAT-GUANO arcminute localization of a short burst
  14. GRB 240414A: Fermi GBM Observation
  15. Fermi GRB 240415A: Global MASTER-Net observations report
  16. IceCube-240412A: Upper limits from a search for additional neutrino events in IceCube
  17. LXT 240402A/GRB 240402B: Swift follow-up observations
  18. GRB 240414B: Fermi GBM Final Real-time Localization
  19. GRB 240415A: Swift detection of a burst
  20. GRB 240415A: Fermi GBM Final Real-time Localization
  21. EP240413a: Upper limits from GECAM-B Observation
  22. EP 240414a: NOT optical counterpart confirmation
  23. LIGO/Virgo/KAGRA S240413p: No Counterparts in DDOTI/OAN Optical Observations
  24. Fermi trigger No 734754044: Global MASTER-Net observations report
  25. Swift GRB 240414A: Global MASTER-Net observations report
  26. IPN triangulation of GRB 240410A
  27. EP240413a: possible detection of the X-ray emission with EP-FXT after 14 hours
  28. IPN triangulation of GRB 240411A
  29. Fermi-LAT gamma-ray observations of IceCube-240412A
  30. GRB 240414A : MITSuME Akeno optical upper limits
  31. GRB 240414A: Swift detection of a burst
  32. LIGO/Virgo/KAGRA S240413p: Updated Sky localization
  33. LIGO/Virgo/KAGRA S240413p: Global MASTER-Net observations report
  34. LIGO/Virgo/KAGRA S240413p: Zwicky Transient Facility observations
  35. LIGO/Virgo/Kagra S240413p: NED Galaxies in the Localization Volume
  36. LIGO/Virgo/KAGRA S240413p: Identification of a GW compact binary merger candidate
  37. GRB 240411B: HiPERCAM/GTC observation
  38. IceCube Alert 240412.23: Global MASTER-Net observations report
  39. GRB 240411B: Swift-BAT refined analysis
  40. IceCube-240412A - IceCube observation of a high-energy neutrino candidate track-like event
  41. GRB 240411B: 1.3m DFOT Optical observations
  42. GRB 240411A: GRBAlpha detection
  43. GRB 240411B: Swift detection of a burst
  44. GRB 240408B: GRBAlpha detection
  45. GRB 240411A: Fermi GBM Final Real-time Localization
  46. EP240408A: MASTER optical observations
  47. EP240408a: Upper limits from GECAM-B Observation
  48. EP240408a: Swift follow-up observation
  49. GRB 240405A: GRBAlpha detection
  50. GRB 240408B: AstroSat CZTI detection
  51. IceCube-240327B: GRANDMA/Kilonova-Catcher observations of 4FGL J0555.9+0030 and optical upper limits
  52. Fermi GRB 240408A: Global MASTER-Net observations report
  53. GRB 240408A: Fermi GBM Final Real-time Localization
  54. GRB 240407A: BALROG localization (Fermi Trigger 734144396 / GRB 240407042)
  55. Fermi GRB 240407A: Global MASTER-Net observations report
  56. GRB 240407A: Fermi GBM Final Real-time Localization
  57. Fermi-LAT gamma-ray observations of IceCube-240327B
  58. Fermi-LAT gamma-ray observations of IceCube-240327A
  59. LXT 240402A/GRB 240402B: rest-frame energetics from Konus-Wind observation
  60. Fermi GRB 240405B: Global MASTER-Net observations report
  61. GRB 240405B: Fermi GBM Final Real-time Localization
  62. GRB 240405A: Fermi GBM Final Real-time Localization
  63. GRB 240402C: GRBAlpha detection
  64. GRB 240331A: GRBAlpha detection
  65. LXT 240402A/GRB 240402B: GECAM-C refined analysis
  66. GRB 240403B: Glowbug gamma-ray detection
  67. Konus-Wind detection of LXT 240402A/GRB 240402B
  68. IceCube-240327B: GRANDMA observations of 4FGL J0555.9+0030
  69. GRB/FXT 240402B: VLT/FORS2 optical afterglow candidate
  70. GRB 240403A: Fermi GBM Detection
  71. LXT 240402A: EP-FXT detection of the X-ray afterglow
  72. Fermi GRB 240404A: Global MASTER-Net observations report
  73. GRB 240404A: Fermi GBM Final Real-time Localization
  74. LXT 240402A: MASTER optical observations with AGN in error-box
  75. GRB 240402B: GECAM-C detection
  76. GRB 240403A: BALROG localization (Fermi Trigger 733838255 / GRB 240403498)
  77. Fermi trigger No 733808041: Global MASTER-Net observations report
  78. Fermi GRB 240402A: Global MASTER-Net observations report
  79. GRB 240402A: Fermi GBM Final Real-time Localization
  80. X-ray transient EP240331a: Kinder optical upper limits
  81. EP240331A: MASTER optical observations
  82. IceCube-240327B: Upper limits from a search for additional neutrino events in IceCube
  83. IceCube-240327A: Upper limits from a search for additional neutrino events in IceCube
  84. Integral GRB240401.69: Global MASTER-Net observations report
  85. GRB 240331A: Fermi GBM Final Real-time Localization
  86. GRB 240329A: GRBAlpha detection
  87. Fermi trigger No 733366352: Global MASTER-Net observations report
  88. Fermi GRB 240329A: Global MASTER-Net observations report
  89. GRB 240329A: BALROG localization (Fermi Trigger 733441392 / GRB 240329905)
  90. GRB 240329A: Fermi GBM Final Real-time Localization
  91. Fermi GRB 240328B: Global MASTER-Net observations report
  92. Fermi GRB 240328A: Global MASTER-Net observations report
  93. IceCube-240327B: No candidates from the Zwicky Transient Facility
  94. GRB 240328C: Glowbug gamma-ray detection
  95. GRB 240328B: Fermi GBM Final Real-time Localization
  96. GRB 240328A: Fermi GBM Final Real-time Localization
  97. IceCube Alert 240327.68: Global MASTER-Net observations report
  98. IceCube-240327B - IceCube observation of a high-energy neutrino candidate track-like event
  99. IceCube-240327A - IceCube observation of a high-energy neutrino candidate track-like event
  100. Fermi trigger No 733097506: Global MASTER-Net observations report

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