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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"

26731 results found.

  1. GRB 130606A - Liverpool Telescope and Faulkes Telescope North optical observations
  2. GRB 130609A: Fermi GBM observation
  3. GRB 130608A: Swift-XRT refined Analysis
  4. GRB 130609A: Swift-XRT refined Analysis
  5. GRB 130608A: RATIR Optical and NIR Observations
  6. GRB 130609A: Enhanced Swift-XRT position
  7. GRB 130608A: Enhanced Swift-XRT position
  8. GRB 130609A: RATIR Optical and NIR Observations
  9. GRB130608A: BOOTES-2/TELMA upper limits
  10. GRB 130609A: Swift detection of a burst
  11. GRB 130608A: Swift detection of a burst
  12. GRB 130606A: Continued Skynet/PROMPT observations
  13. GRB 130606A: Continued RATIR Optical and NIR Monitoring
  14. GRB 130606B: AGILE-MCAL observation
  15. GRB 130606B: RATIR Optical and NIR Observations
  16. GRB 130606B: Swift-XRT observations
  17. GRB 130606A: TAROT Calern observatory early optical observations
  18. GRB 130606A: Skynet/PROMPT detection of the optical afterglow
  19. GRB 130606A: Swift/UVOT Upper Limits
  20. GRB 130603A: AAO optical observations
  21. GRB 130606A: Swift-XRT refined Analysis
  22. GRB 130606A: Enhanced Swift-XRT position
  23. Konus-Wind observation of GRB 130606A
  24. GRB 130606A: GROND Detection of the Optical/NIR Afterglow
  25. GRB 130606A: AAO optical observations
  26. GRB 130606A: P60 Observations
  27. GRB 130606A: PAIRITEL NIR Afterglow Observations
  28. GRB 130606B; Fermi GBM observation
  29. GRB 130606A: RATIR r'-band Dropout
  30. GRB 130606A:T100 observations
  31. GRB 130606B: Fermi-LAT detection of a bright hard burst
  32. GRB130606A: Montarrenti Observatory afterglow detection
  33. Virtual Telescope observations of GRB 130606A
  34. GRB 130605A: Swift-XRT refined Analysis
  35. GRB 130605A: Swift-BAT refined analysis
  36. GRB 130606A - Liverpool Telescope Optical Afterglow Confirmation
  37. GRB 130606A: IRSF NIR Observation
  38. GRB 130606A: NOT afterglow detection
  39. GRB 130606A: optical afterglow with BOOTES-2/TELMA and 1.23m CAHA
  40. GRB 130606A: Swift detection of a burst
  41. GRB 130605A: Swift/UVOT Detection
  42. GRB 130605A: Continued Skynet/PROMPT observations
  43. GRB 130605A: Skynet/PROMPT detection of a fading afterglow
  44. GRB 130605A: TAROT La Silla observatory optical detection of the afterglow
  45. GRB 130605A: GROND afterglow candidate
  46. GRB 130605A: Swift detection of a burst
  47. GRB 130604A: Swift/UVOT Upper Limits
  48. Swift Trigger 557466 is probably not real.
  49. GRB 130604A: Swift-XRT refined Analysis
  50. GRB 130604B: Fermi GBM detection
  51. GRB 130603B: RATIR Optical and NIR Observations
  52. GRB 130604A: Enhanced Swift-XRT position
  53. GRB 130603B: P60 Observations
  54. GRB 130604A: MITSuME Okayama upper limits
  55. GRB130603B: Swift/UVOT detection
  56. GRB 130604A: ISON-NM optical upper limit
  57. GRB 130603A: MITSuME Akeno Optical observation
  58. GRB 130604A: Swift detection of a burst
  59. GRB 130603A: SON optical observations
  60. GRB 130603B: Swift-XRT refined Analysis
  61. GRB 130603B: Gemini Observations
  62. GRB 130603B: Swift-BAT Spectral lag analysis
  63. GRB 130603B: Magellan redshift confirmation
  64. GRB 130603B: Afterglow detection from NOT
  65. GRB 130603B: WHT optical afterglow candidate
  66. GRB 130603A: Swift-XRT refined Analysis
  67. GRB 130603B: Enhanced Swift-XRT position
  68. Swift/UVOT observations of GRB130603A
  69. GRB 130603A: Enhanced Swift-XRT position
  70. GRB 130603B: Swift detection of a bright short burst
  71. GRB 130603A: MITSuME Okayama Optical Observation
  72. GRB 130603A: Swift-XRT observations
  73. GRB 130603A: Swift-XRT and Swift-UVOT detections
  74. GRB 130529A: GROND upper limits
  75. GRB 130528A: Fermi GBM detection
  76. GRB 130529A: Swift/UVOT Upper Limits
  77. GRB 130527A: Suzaku WAM observation of the prompt emission
  78. GRB 130518A: Suzaku WAM observation of the prompt emission
  79. GRB 130529A: Swift-XRT refined Analysis
  80. GRB 130529A: Enhanced Swift-XRT position
  81. GRB 130528A: Swift/UVOT Upper Limits
  82. GRB 130529A: Swift detection of a burst
  83. GRB 130528A: Swift-XRT refined Analysis
  84. GRB 130527A: Swift/UVOT Upper Limits
  85. GRB 130528A: Enhanced Swift-XRT position
  86. GRB 130521A: Skynet/PROMPT detection of an extremely red afterglow
  87. GRB 130528A: optical upper limit
  88. GRB 130528A: Swift detection of a burst
  89. GRB 130527A: NOT optical counterpart
  90. GRB 130527A: RATIR Optical and NIR Observations
  91. GRB 130527A: Swift-XRT refined Analysis
  92. GRB 130527A: BOOTES-2 & 3.5m CAHA opt/nIR observations
  93. GRB 130527A: Enhanced Swift-XRT position
  94. GRB 130527A: Swift detection of a bright burst
  95. GRB 130514A: Konus-Wind and Swift/BAT joint spectral analysis
  96. Swift Trigger 556533 is not an astrophysical event
  97. GRB 130521B: Suzaku WAM observation of the prompt emission
  98. Swift Trigger 556533 is probably not an astrophysical event
  99. GRB 130521A: Skynet/PROMPT observations
  100. GRB 130521A, Swift-BAT refined analysis

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