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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"

37610 results found.

  1. GRB 260120A: GECAM-B observation
  2. GRB 260120B: AstroSat CZTI detection
  3. GRB 260114A: Insight-HXMT/HE detection
  4. GRB 260122B: Swift detection of a burst
  5. EP260119a: Assy AZT-20 optical observations
  6. EP260119a: Mondy and SAO RAS optical upper limits
  7. GRB 260122A: Fermi GBM Final Real-time Localization
  8. Fermi GRB 260120C: Global MASTER-Net observations report
  9. GRB 260120B: Swift-BAT refined analysis
  10. GRB 260120B: Swift-XRT refined Analysis
  11. GRB 251122A / EP251122a: VLT/X-shooter host redshift z = 1.765
  12. GRB 260120B: Fermi GBM Observation
  13. GRB 260120B: Swift/UVOT Detection
  14. GRB 260120B: COLIBRÍ optical upper limits
  15. GRB 260120B: Enhanced Swift-XRT position
  16. GRB 260120B: SVOM/C-GFT optical counterpart detection
  17. GRB 260120C: Fermi GBM Final Real-time Localization
  18. GRB 260101A: 239Alferov CubeSat detection
  19. GRB 260120B: Swift detection of a burst
  20. GRB 260120B: Fermi GBM Final Real-time Localization
  21. EP260119A: Mondy I-Band Observations
  22. Fermi trigger No 790601190: Global MASTER-Net observations report
  23. Fermi trigger No 790570272: Global MASTER-Net observations report
  24. GRB 260114A: Swift/UVOT Upper Limits
  25. GRB 251202A: further radio observations with the VLA
  26. EP260119a: KAIT optical observations
  27. GRB 260120A: Fermi GBM Final Real-time Localization
  28. EP260119a: SAO RAS optical observations
  29. GRB 251208D: SVOM/ECLAIRs refined analysis
  30. GRB 251208D: SVOM/ECLAIRs refined analysis
  31. GRB 260117A: Swift-XRT afterglow detection
  32. GRB 260115A: AstroSat CZTI detection
  33. GRB 260117A: ZTSh optical upper limit
  34. GRB 260110A: SVOM detection of a burst through offline search
  35. GRB 260117A: SVOM/COLIBRÍ (FM-GFT) optical observations
  36. Fermi-LAT Gamma-ray Observations of IceCube-260115A
  37. GRB 260117A: SVOM/VT optical candidate
  38. GRB 260117A: SVOM/C-GFT upper limit
  39. GRB 260117A: Swift-XRT observations
  40. GRB 260117A: Swift ToO observations
  41. GRB 260117A: SVOM detection of a long faint burst
  42. GRB 260115A: GECAM-B observation
  43. GRB 260114A: VLT/MUSE spectroscopic observations
  44. GRB 260111A: COLIBRÍ fading of the optical counterpart candidate
  45. GRB 260114A: VLT/HAWK-I further near-infrared upper limits
  46. IceCube-260115A - IceCube observation of a high-energy neutrino candidate track-like event
  47. GRB 260115A: BALROG localization (Fermi Trigger 790192010 / GRB 260115741)
  48. Fermi GRB 260115A: Global MASTER-Net observations report
  49. GRB 260115A: Fermi GBM Final Real-time Localization
  50. GRB260114A: STEP/T80S optical limits
  51. GRB 251222A: radio detection with the VLA
  52. GRB 260114A: VLT/HAWK-I near-infrared upper limits
  53. Konus-Wind detection of GRB 260114A
  54. GRB 260114A: Swift-XRT refined Analysis
  55. GRB 260114A: 6 GHz VLA observations
  56. GRB 260114A: VLT/X-shooter redshift of the putative host galaxy
  57. GRB 260114A : MITSuME Akeno optical upper limits
  58. GRB 260114A: COLIBRÍ optical upper limits
  59. GRB 260114A: TNG NIR upper limit
  60. GRB 260114A: NOT optical observations
  61. Konus-Wind detection of GRB 251230A / EP251230a
  62. GRB 260114A: SVOM/GRM observation of a short burst
  63. Swift GRB 260114A: Global MASTER-Net observations report
  64. GRB 260114A: GECAM-B observation of a short burst
  65. GRB 260114A: Mondy optical observations
  66. GRB 260114A: Fermi GBM observation
  67. GRB 260112B: GECAM-B observation
  68. GRB 260114A: GMG Optical Observation
  69. Fermi-LAT Gamma-ray Observations of IceCube-260111A
  70. GRB 260114A: Swift detection of a short burst
  71. GRB 260114A: Fermi GBM Final Real-time Localization
  72. Konus-Wind detection of GRB 260101A
  73. GRB 260111A: Swift-XRT observations
  74. Swift Trigger 1439093: is probably not GRB 260113A
  75. GRB 260111A: COLIBRÍ optical afterglow candidate
  76. GRB 260111A: GECAM-B observation of a burst
  77. GRB 260111A: Fermi GBM Observation
  78. Swift Trigger 1434591 is not a GRB
  79. GRB 260111A: GOTO optical upper limits
  80. GRB 260112B: Fermi GBM Final Real-time Localization
  81. GRB 260111A: Swift ToO observations
  82. GRB 251230A: Mondy Optical Observations
  83. GRB 260111A: Swift/BAT-GUANO arcminute localization of a burst
  84. GRB 260112A: Fermi GBM Final Real-time Localization
  85. IceCube-260111A - IceCube observation of a high-energy neutrino candidate track-like event
  86. Fermi GRB 260111A: Global MASTER-Net observations report
  87. GRB 260111A: Fermi GBM Final Real-time Localization
  88. EP260110a: KAIT optical upper limit
  89. GRB 260109C: LCO optical upper limits
  90. GRB 260109C: Kilonova-Catcher optical upper limit
  91. EP260105b / GRB 260105C : Fermi-GBM Sub-Threshold Detection
  92. Swift Trigger 1434591: possible GRB 260109C
  93. GRB 260109B: Fermi GBM Final Real-time Localization
  94. GRB 260102A: Swift-XRT afterglow detection
  95. GRB 260109A: Fermi GBM Final Real-time Localization
  96. GRB 260104A: Swift-BAT refined analysis
  97. GRB 260101A: Swift-BAT refined analysis
  98. Swift GRB 251230A: Global MASTER-Net OT detection
  99. Fermi GRB 260107A: Global MASTER-Net observations report
  100. GRB 260102A: AbAO optical observations

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