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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"

24519 results found.

  1. IceCube-240412A: Upper limits from a search for additional neutrino events in IceCube
  2. LXT 240402A/GRB 240402B: Swift follow-up observations
  3. GRB 240414B: Fermi GBM Final Real-time Localization
  4. GRB 240415A: Swift detection of a burst
  5. GRB 240415A: Fermi GBM Final Real-time Localization
  6. EP240413a: Upper limits from GECAM-B Observation
  7. EP 240414a: NOT optical counterpart confirmation
  8. LIGO/Virgo/KAGRA S240413p: No Counterparts in DDOTI/OAN Optical Observations
  9. Fermi trigger No 734754044: Global MASTER-Net observations report
  10. Swift GRB 240414A: Global MASTER-Net observations report
  11. IPN triangulation of GRB 240410A
  12. EP240413a: possible detection of the X-ray emission with EP-FXT after 14 hours
  13. IPN triangulation of GRB 240411A
  14. Fermi-LAT gamma-ray observations of IceCube-240412A
  15. GRB 240414A : MITSuME Akeno optical upper limits
  16. GRB 240414A: Swift detection of a burst
  17. LIGO/Virgo/KAGRA S240413p: Updated Sky localization
  18. LIGO/Virgo/KAGRA S240413p: Global MASTER-Net observations report
  19. LIGO/Virgo/KAGRA S240413p: Zwicky Transient Facility observations
  20. LIGO/Virgo/Kagra S240413p: NED Galaxies in the Localization Volume
  21. LIGO/Virgo/KAGRA S240413p: Identification of a GW compact binary merger candidate
  22. GRB 240411B: HiPERCAM/GTC observation
  23. IceCube Alert 240412.23: Global MASTER-Net observations report
  24. GRB 240411B: Swift-BAT refined analysis
  25. IceCube-240412A - IceCube observation of a high-energy neutrino candidate track-like event
  26. GRB 240411B: 1.3m DFOT Optical observations
  27. GRB 240411A: GRBAlpha detection
  28. GRB 240411B: Swift detection of a burst
  29. GRB 240408B: GRBAlpha detection
  30. GRB 240411A: Fermi GBM Final Real-time Localization
  31. EP240408A: MASTER optical observations
  32. EP240408a: Upper limits from GECAM-B Observation
  33. EP240408a: Swift follow-up observation
  34. GRB 240405A: GRBAlpha detection
  35. GRB 240408B: AstroSat CZTI detection
  36. IceCube-240327B: GRANDMA/Kilonova-Catcher observations of 4FGL J0555.9+0030 and optical upper limits
  37. Fermi GRB 240408A: Global MASTER-Net observations report
  38. GRB 240408A: Fermi GBM Final Real-time Localization
  39. GRB 240407A: BALROG localization (Fermi Trigger 734144396 / GRB 240407042)
  40. Fermi GRB 240407A: Global MASTER-Net observations report
  41. GRB 240407A: Fermi GBM Final Real-time Localization
  42. Fermi-LAT gamma-ray observations of IceCube-240327B
  43. Fermi-LAT gamma-ray observations of IceCube-240327A
  44. LXT 240402A/GRB 240402B: rest-frame energetics from Konus-Wind observation
  45. Fermi GRB 240405B: Global MASTER-Net observations report
  46. GRB 240405B: Fermi GBM Final Real-time Localization
  47. GRB 240405A: Fermi GBM Final Real-time Localization
  48. GRB 240402C: GRBAlpha detection
  49. GRB 240331A: GRBAlpha detection
  50. LXT 240402A/GRB 240402B: GECAM-C refined analysis
  51. GRB 240403B: Glowbug gamma-ray detection
  52. Konus-Wind detection of LXT 240402A/GRB 240402B
  53. IceCube-240327B: GRANDMA observations of 4FGL J0555.9+0030
  54. GRB/FXT 240402B: VLT/FORS2 optical afterglow candidate
  55. GRB 240403A: Fermi GBM Detection
  56. LXT 240402A: EP-FXT detection of the X-ray afterglow
  57. Fermi GRB 240404A: Global MASTER-Net observations report
  58. GRB 240404A: Fermi GBM Final Real-time Localization
  59. LXT 240402A: MASTER optical observations with AGN in error-box
  60. GRB 240402B: GECAM-C detection
  61. GRB 240403A: BALROG localization (Fermi Trigger 733838255 / GRB 240403498)
  62. Fermi trigger No 733808041: Global MASTER-Net observations report
  63. Fermi GRB 240402A: Global MASTER-Net observations report
  64. GRB 240402A: Fermi GBM Final Real-time Localization
  65. X-ray transient EP240331a: Kinder optical upper limits
  66. EP240331A: MASTER optical observations
  67. IceCube-240327B: Upper limits from a search for additional neutrino events in IceCube
  68. IceCube-240327A: Upper limits from a search for additional neutrino events in IceCube
  69. Integral GRB240401.69: Global MASTER-Net observations report
  70. GRB 240331A: Fermi GBM Final Real-time Localization
  71. GRB 240329A: GRBAlpha detection
  72. Fermi trigger No 733366352: Global MASTER-Net observations report
  73. Fermi GRB 240329A: Global MASTER-Net observations report
  74. GRB 240329A: BALROG localization (Fermi Trigger 733441392 / GRB 240329905)
  75. GRB 240329A: Fermi GBM Final Real-time Localization
  76. Fermi GRB 240328B: Global MASTER-Net observations report
  77. Fermi GRB 240328A: Global MASTER-Net observations report
  78. IceCube-240327B: No candidates from the Zwicky Transient Facility
  79. GRB 240328C: Glowbug gamma-ray detection
  80. GRB 240328B: Fermi GBM Final Real-time Localization
  81. GRB 240328A: Fermi GBM Final Real-time Localization
  82. IceCube Alert 240327.68: Global MASTER-Net observations report
  83. IceCube-240327B - IceCube observation of a high-energy neutrino candidate track-like event
  84. IceCube-240327A - IceCube observation of a high-energy neutrino candidate track-like event
  85. Fermi trigger No 733097506: Global MASTER-Net observations report
  86. X-ray transient EP240315a: Ondrejov D50 optical limit
  87. Fermi trigger No 733092476: Global MASTER-Net observations report
  88. Fermi trigger No 732937833: Global MASTER-Net observations report
  89. GRB 240318A: Fermi GBM Observation
  90. Fermi GRB 240320A: Global MASTER-Net observations report
  91. Konus-Wind detection of GRB 240315C (possible counterpart of EP240315a)
  92. GRB 240315C / X-ray transient EP240315a: Swift/BAT detection
  93. Fermi trigger No 732657380: Global MASTER-Net observations report
  94. GRB 240318A: Swift/BAT-GUANO detection of a burst outside the coded FOV
  95. GRB 240320A: Fermi GBM Final Real-time Localization
  96. IPN triangulation of GRB 240315C (consistent with a fast X-ray transient EP240315a)
  97. GRB 240317B: Swift/BAT-GUANO Angular Error Correction
  98. X-ray transient EP 240315a: Chandra observations
  99. GRB 240317C: Glowbug gamma-ray detection
  100. GRB 240318B: Glowbug gamma-ray detection

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