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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"

29103 results found.

  1. SVOM GRB260119.92: Global MASTER-Net observations report
  2. SVOM GRB260119.90: Global MASTER-Net observations report
  3. EP260116a: COLIBRÍ detection of a fading optical source
  4. EP260119a: COLIBRÍ photometric redshift z ≈ 5.6
  5. EP260119a: Global MASTER-Net observations report
  6. GRB 260115A: AstroSat CZTI detection
  7. EP260119a: LCO optical observations
  8. EP260119a: COLIBRÍ optical counterpart candidate
  9. GRB 260110A: SVOM detection of a burst through offline search
  10. EP260119a: EP-WXT detection of a fast X-ray transient
  11. Swift GRB260118.48: Global MASTER-Net observations report
  12. GRB 260117A: SVOM/COLIBRÍ (FM-GFT) optical observations
  13. SVOM GRB260117.82: Global MASTER-Net observations report
  14. Fermi-LAT Gamma-ray Observations of IceCube-260115A
  15. Swift trigger on the HMXB 1A 1118-61
  16. GRB 260117A: SVOM/VT optical candidate
  17. GRB 260117A: SVOM/C-GFT upper limit
  18. GRB 260117A: SVOM detection of a long faint burst
  19. EP 260116a: COLIBRÍ optical upper limit
  20. Swift triggered on the HMXB 1A 1118-61
  21. GRB 260115A: GECAM-B observation
  22. EP260116a: Liverpool Telescope upper limits
  23. EP260116A: 1.3m DFOT optical upper limit
  24. GRB 260114A: VLT/MUSE spectroscopic observations
  25. EP260116a: Global MASTER-Net observations report
  26. GRB 260111A: COLIBRÍ fading of the optical counterpart candidate
  27. EP260116a: Xinglong optical upper limit
  28. GRB 260114A: VLT/HAWK-I further near-infrared upper limits
  29. IceCube Alert 260115.73: Global MASTER-Net observations report
  30. IceCube-260115A - IceCube observation of a high-energy neutrino candidate track-like event
  31. GRB 260115A: BALROG localization (Fermi Trigger 790192010 / GRB 260115741)
  32. Fermi GRB 260115A: Global MASTER-Net observations report
  33. GRB 260115A: Fermi GBM Final Real-time Localization
  34. GRB260114A: STEP/T80S optical limits
  35. GRB 251222A: radio detection with the VLA
  36. GRB 260114A: VLT/HAWK-I near-infrared upper limits
  37. Konus-Wind detection of GRB 260114A
  38. GRB 260114A: Swift-XRT refined Analysis
  39. GRB 260114A: 6 GHz VLA observations
  40. GRB 260114A: VLT/X-shooter redshift of the putative host galaxy
  41. GRB 260114A : MITSuME Akeno optical upper limits
  42. GRB 260114A: COLIBRÍ optical upper limits
  43. GRB 260114A: TNG NIR upper limit
  44. GRB 260114A: NOT optical observations
  45. GRB 260114A: SVOM/GRM observation of a short burst
  46. Swift GRB 260114A: Global MASTER-Net observations report
  47. GRB 260114A: GECAM-B observation of a short burst
  48. GRB 260114A: Mondy optical observations
  49. GRB 260114A: Fermi GBM observation
  50. GRB 260112B: GECAM-B observation
  51. GRB 260114A: GMG Optical Observation
  52. Fermi-LAT Gamma-ray Observations of IceCube-260111A
  53. GRB 260114A: Swift detection of a short burst
  54. GRB 260114A: Fermi GBM Final Real-time Localization
  55. EP-WXT trigger 01709251266: SVOM/C-GFT confirmation of a stellar flare
  56. Swift GRB260113.43: Global MASTER-Net observations report
  57. EP260110a: NOT and GTC Optical and Near-Infrared Observations
  58. EP260110a: TRT optical upper limits
  59. Konus-Wind detection of GRB 260101A
  60. GRB 260111A: Swift-XRT observations
  61. Swift Trigger 1439093: is probably not GRB 260113A
  62. GRB 260111A: COLIBRÍ optical afterglow candidate
  63. GRB 260111A: GECAM-B observation of a burst
  64. GRB 260111A: Fermi GBM Observation
  65. The EP-WXT trigger 01709251266 is likely a flaring star
  66. Swift Trigger 1434591 is not a GRB
  67. GRB 260111A: GOTO optical upper limits
  68. GRB 260112B: Fermi GBM Final Real-time Localization
  69. GRB 251230A: Mondy Optical Observations
  70. GRB 260111A: Swift/BAT-GUANO arcminute localization of a burst
  71. GRB 260112A: Fermi GBM Final Real-time Localization
  72. EP260110a: SVOM/VT optical upper limits
  73. IceCube-260111A - IceCube observation of a high-energy neutrino candidate track-like event
  74. IceCube Alert 260111A: Global MASTER-Net observations report
  75. EP260110a: Global MASTER-Net observations report
  76. Fermi GRB 260111A: Global MASTER-Net observations report
  77. GRB 260111A: Fermi GBM Final Real-time Localization
  78. Swift trigger 1436759 is not an astrophysical event
  79. EP 260110a: COLIBRÍ optical observations
  80. EP260110a: SVOM/C-GFT upper limit
  81. GRB 260109C: LCO optical upper limits
  82. EP260105b / GRB 260105C : Fermi-GBM Sub-Threshold Detection
  83. Swift Trigger 1434591: possible GRB 260109C
  84. GRB 260109B: Fermi GBM Final Real-time Localization
  85. GRB 260109A: Fermi GBM Final Real-time Localization
  86. GRB 260104A: Swift-BAT refined analysis
  87. GRB 260101A: Swift-BAT refined analysis
  88. Swift GRB 251230A: Global MASTER-Net OT detection
  89. Fermi GRB 260107A: Global MASTER-Net observations report
  90. GRB 260102A: AbAO optical observations
  91. GRB 260107A: Fermi GBM Final Real-time Localization
  92. EP260105b/EP-WXT trigger 01709251028: Einstein Probe detection of an X-ray transient
  93. The EP-WXT trigger 01709251112 is likely a flaring star
  94. Fermi GRB 260105A: Global MASTER-Net observations report
  95. GRB 260105B: Fermi GBM Detection
  96. EP260105a: FTW optical observations
  97. EP260104a: FTW optical observations
  98. GRB 260105B: BALROG localization (Fermi Trigger 789348101 / GRB 260105973)
  99. GRB 260105A: SVOM/GRM observation
  100. GRB 260105B: SVOM/GRM observation

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