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GCN Circulars

GCN Circulars are rapid astronomical bulletins submitted by and distributed to community members worldwide. They are used to share discoveries, observations, quantitative near-term predictions, requests for follow-up observations, or future observing plans related to high-energy, multi-messenger, and variable or transient astrophysical events. 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"

27393 results found.

  1. GRB 070521, Swift-BAT refined analysis
  2. GRB 070520A: Swift UVOT Upper Limits
  3. GRB 070520B: Swift-XRT refined analysis
  4. GRB 070521: TAROT La Silla observatory optical observations
  5. GRB070521 - SDSS Pre-Burst Observations
  6. GRB 070521: Swift detection of a burst
  7. GRB 070520A: MITSuME Akeno optical upper limits
  8. GRB 070520B, Swift-BAT refined analysis
  9. GRB 070520A, Swift-BAT refined analysis
  10. GRB 070520A: Swift-XRT refined analysis
  11. GRB 070518: TNG observations
  12. GRB 070520B: Swift detection of a burst
  13. GRB 070520: Xinglong EST optical Upper Limit
  14. GRB 070520: Swift detection of a burst
  15. VLA observation of GRB 070518
  16. GRB 070518: Swift-XRT refined analysis
  17. GRB070518: UVOT refined analysis
  18. GRB 070518, Swift-BAT refined analysis
  19. GRB 070518: OT confirmed form Xinglong TNT observation
  20. GRB 070518: Swift detection of a burst with optical afterglow
  21. GRB070517: Swift-XRT Refined Analysis
  22. GRB 070517, Swift-BAT refined analysis
  23. GRB 070517: Optical search
  24. GRB 070517: Swift detection of a burst
  25. GRB 070509: objects inside XRT error circle
  26. GRB 070512: IPN localization and Konus spectrum of a bright burst
  27. GRB070419A: optical observations
  28. GRB 070509: Swift/UVOT Upper Limits
  29. Konus-Wind and Konus-A observation of GRB 070508
  30. GRB 070510: Swift detection of a possible burst
  31. GRB070509: Swift-XRT Refined Analysis
  32. GRB 070509, Swift-BAT refined analysis
  33. GRB 070508: Suzaku/WAM observation of the prompt emission
  34. GRB 070509: REM observations
  35. GRB070508: Swift/UVOT Observations
  36. GRB 070508, Swift-BAT refined analysis
  37. GRB 070508: REM observations
  38. GRB 070508: TAROT La Silla observatory optical observations
  39. GRB 070508: Swift detection of an intense burst with an optical counterpart
  40. GRB070506: Swift/UVOT Observations
  41. GRB070506: Swift XRT refined analysis
  42. GRB 070506, Swift-BAT Refined Analysis
  43. GRB 070506: Swift detection of a burst with optical afterglow
  44. GRB070429B: VLT observations
  45. GRB070429B: position correction
  46. GRB 070309: Swift-XRT afterglow confirmation
  47. VLA observation of GRB 070429B
  48. Swift/UVOT observations of GRB070429B
  49. GRB 070429B, Swift-BAT refined analysis
  50. Swift/UVOT observations of GRB070429A
  51. GRB 070429A, Swift-BAT refined analysis
  52. GRB 070429A: optical and NIR observations
  53. GRB 070429B: Swift XRT refined analysis
  54. GRB 070429B: ROTSE-III Optical Limits
  55. GRB 070429: ROTSE-III Optical Limits
  56. GRB 070429: Swift detection of a burst
  57. GRB 070427, Swift-BAT Refined Analysis
  58. LT monitoring of GRB070412
  59. GRB 070411: Late-time Keck imaging
  60. GRB070419B: Suzaku WAM observation of the prompt emission
  61. GRB 070420, SMARTS optical/IR afterglow observations
  62. GRB 070411, deep LBT photometry
  63. Konus-Wind observation of GRB 070420
  64. GRB 070411: break in the optical light curve
  65. GRB 070420 Swift-BAT Refined Analysis
  66. GRB 070420: optical rebrightening observed at Mt. John
  67. GRB070420: Swift UVOT continuing observations
  68. GRB 070420: Faulkes Telescope South Observations
  69. GRB 070420: TAROT La Silla observatory optical observations
  70. GRB 070420: NIR and optical afterglow confirmed
  71. GRB 070420: Swift detection of a burst with optical afterglow
  72. GRB 070419A: MITSuME Okayama Observations
  73. GRB 070419A: Early Super-LOTIS Observations
  74. GRB 070419B, Swift-BAT refined analysis
  75. GRB 070419A Swift-BAT Refined Analysis
  76. GRB 070419A, Optical observations
  77. GRB070419 - SDSS Pre-Burst Observations
  78. GRB 070419A: SARA observations
  79. GRB 070419A: NAYUTA Optical Observation
  80. GRB 070419B optical afterglow candidate
  81. GRB 070419A: Optical and IR observations with KANATA
  82. GRB 070419B: optical afterglow candidate
  83. GRB070419A, optical observation
  84. Infrared detection of GRB070419A with UKIRT
  85. GRB 070419A: Kiso Optical observation
  86. GRB 070419: P60 Confirmation of Optical Afterglow
  87. GRB 070419B: Swift detection of a burst
  88. GRB 070419A: ROTSE-III Optical Limits
  89. GRB 070419: Swift detection of a burst
  90. GRB 070418: Optical and IR observations with KANATA
  91. Trigger 276045: Swift detection of a possible burst
  92. GRB 070406: Swift XRT refined analysis
  93. GRB070412: UKIRT-WFCAM JHK upper limits
  94. GRB070412: Swift UVOT observations
  95. GRB 070411: Swift/UVOT observations
  96. GRB 070412, Swift-BAT refined analysis
  97. GRB 070412 Liverpool Telescope optical limit
  98. GRB 070412: Optical observations at Crni Vrh
  99. GRB 070412: further NOT observations
  100. GRB 070412: Gemini/GMOS afterglow candidate

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