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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"

24516 results found.

  1. GRB 111103B: optical observations
  2. GRB 111103B: Swift detection of a strong burst from a GRB or Galactic source
  3. GRB 111103A: Swift detection of a burst
  4. GRB 111029A: RAPTOR Limits During the Gamma-ray Emitting Interval
  5. All GCN Circulars available in a tarfile for data mining
  6. GRB111029A: MITSuME Ishigakijima Optical Upper Limits
  7. GRB 111026A: Swift-BAT refined analysis
  8. GRB 111029A: Swift-BAT refined analysis
  9. GRB 111029A: Faulkes Telescope North observations
  10. GRB 111029A: ROTSE-III Optical Limits
  11. GRB 111029A: Swift detection of a burst
  12. GRB 111026A: Swift detection of a burst
  13. GRB 111022B: 10.4m GTC z'-band observations
  14. GRB 111022A: MITSuME Akeno Optical upper limits
  15. GRB 111022B, Swift-BAT refined analysis
  16. GRB 111022B: Gemini infrared observations
  17. GRB 111022B: MITSuME Akeno Optical upper limits
  18. GRB 111022A: Swift-BAT refined analysis
  19. GRB 111022B: MASTER-Net early limit
  20. GRB 111022A: MASTER-Net early limit
  21. GRB 111022A: Swift detection of a burst
  22. GRB 111020A: Gemini-South additional observations and limit on an optical afterglow
  23. GRB 111020A: Gemini-South i-band observations
  24. GRB 111020A: Faulkes Telescope South observations
  25. GRB 111020A: Swift-BAT refined analysis
  26. GRB 111020A: Swift detection of a short burst
  27. GRB 110918A: Optical light curve for days 1.4 to 16.3
  28. GRB 111018A: Swift-BAT refined analysis
  29. Konus-Wind observation of GRB 111016B
  30. IPN Triangulation of GRB 111016B (long duration, intense)
  31. GRB 111018A: Swift detection of a burst
  32. GRB 111017A: Fermi GBM Detection
  33. GRB 111016A: Gemini Detection of the NIR Counterpart
  34. GRB 111016A: Swift-BAT refined analysis
  35. GRB 111016A: P60 Afterglow Candidate
  36. GRB 111016A: MITSuME Akeno Optical upper limits
  37. GRB 111016A: Swift-XRT refined Analysis
  38. Konus-Wind observation of GRB 111008A
  39. GRB 111008A: VLT/X-shooter spectroscopy
  40. GRB 111008A, Swift-BAT refined analysis,
  41. GRB 111005A : miniTAO/ANIR NIR observations
  42. GRB 111005A: VLT optical observations
  43. GRB 111005A: GROND NIR observations
  44. GRB 111005A: Swift-BAT refined analysis
  45. GRB 111005A: Swift detection of a burst
  46. GRB 111003A: Fermi GBM detection
  47. Skynet/Dolomiti observations of GRB 110928A
  48. Skynet observations of GRB 110928A
  49. GRB 110928A: RAPTOR Limits During Gamma-ray Emitting Interval
  50. Trigger 504307: Swift detection of MAXI J1836-194
  51. GRB 110825A: GROND Observations
  52. GRB 110928A: P60 Observations
  53. GRB 110928A: Further PAIRITEL NIR Observations
  54. GRB 110928A: Swift-BAT refined analysis
  55. GRB 110928A: Swift-XRT observations
  56. GRB 110928A: PAIRITEL NIR Observations
  57. GRB 110928A: ROTSE-III Optical Limits
  58. GRB 110928A: Swift detection of a burst
  59. GCN for GRB 110921B
  60. GRB 110921A: Fermi GBM observation
  61. GRB 110921A, Swift-BAT refined analysis
  62. GRB 110918A: Liverpool Telescope optical observations
  63. GRB 110921A: optical observations in Mt. Terskol and Maidanak observatories
  64. GRB 110921A: MITSuME Akeno Optical Observation
  65. GRB 110921A: MASTER-Net early limit
  66. GRB 110918A: rest-frame energetics in gamma-gays
  67. GRB 110918A optical observation
  68. GRB 110918A: Afterglow Confirmation from PTF
  69. Konus-Wind observation of GRB 110918A
  70. GRB110918A: BOOTES-1 optical limit
  71. Swift detection of short bursts from PSR J1647-4552
  72. GRB 110915A: Konus-Wind and Swift/BAT joint spectral analysis
  73. IPN triangulation of GRB 110918A (long duration, extremely intense)
  74. GRB 110915B: GROND Observations of the Optical/NIR Afterglow Candidate
  75. GRB 110915A: GROND Upper limits
  76. GRB 110915A, Swift-BAT refined analysis
  77. GRB 110903A: Suzaku WAM observation of the prompt emission
  78. GRB110915A MITSuME Okayama J-band upper-limit
  79. GRB 110915A: MITSuME Okayama and Ishigakijima Optical upper limits
  80. GRB 110915A: 1.23m CAHA I-band observations
  81. GRB 110915B: SuperAGILE localization of a long GRB
  82. GRB 110915A: MITSuME Akeno Optical upper limits
  83. GRB 110915A: MASTER-Net early limit
  84. GRB 110731A: SAO RAS and Terskol observations
  85. GRB 110906A(?): Burst detection (unconfirmed) from Swift-BAT slew data
  86. MAXI J1836-194 (originally GRB 110905A): Swift-BAT refined analysis
  87. GRB 110905A: Potential BAT trigger on MAXI J1836-194
  88. GRB 110905A: Swift detection of a burst
  89. GRB 110903A: Fermi GBM observation
  90. Konus-Wind observation of GRB 110903A
  91. GRB 110903A: a long GRB detected by INTEGRAL
  92. SGR Swift J1834.9-0846: Correction to the Swift-BAT refined spectral analysis
  93. GRB110825A: Fermi GBM observation
  94. SGR Swift J1834.9-0846: Swift-BAT refined analysis of trigger 501752
  95. Swift detection of an SGR burst from Swift J1834.9-0846
  96. GRB 110825A: Suzaku WAM observation of the prompt emission
  97. GRB110825A: ROTSE early time optical limit
  98. GRB 110827A, Swift-BAT refined analysis
  99. GRB 110827A: Swift detection of a burst
  100. GRB110825A: Swift target of opportunity observation

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