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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"

27391 results found.

  1. GRB 070520B: Swift-XRT refined analysis
  2. GRB 070521: TAROT La Silla observatory optical observations
  3. GRB070521 - SDSS Pre-Burst Observations
  4. GRB 070521: Swift detection of a burst
  5. GRB 070520A: MITSuME Akeno optical upper limits
  6. GRB 070520B, Swift-BAT refined analysis
  7. GRB 070520A, Swift-BAT refined analysis
  8. GRB 070520A: Swift-XRT refined analysis
  9. GRB 070518: TNG observations
  10. GRB 070520B: Swift detection of a burst
  11. GRB 070520: Xinglong EST optical Upper Limit
  12. GRB 070520: Swift detection of a burst
  13. VLA observation of GRB 070518
  14. GRB 070518: Swift-XRT refined analysis
  15. GRB070518: UVOT refined analysis
  16. GRB 070518, Swift-BAT refined analysis
  17. GRB 070518: OT confirmed form Xinglong TNT observation
  18. GRB 070518: Swift detection of a burst with optical afterglow
  19. GRB070517: Swift-XRT Refined Analysis
  20. GRB 070517, Swift-BAT refined analysis
  21. GRB 070517: Optical search
  22. GRB 070517: Swift detection of a burst
  23. GRB 070509: objects inside XRT error circle
  24. GRB 070512: IPN localization and Konus spectrum of a bright burst
  25. GRB070419A: optical observations
  26. GRB 070509: Swift/UVOT Upper Limits
  27. Konus-Wind and Konus-A observation of GRB 070508
  28. GRB 070510: Swift detection of a possible burst
  29. GRB070509: Swift-XRT Refined Analysis
  30. GRB 070509, Swift-BAT refined analysis
  31. GRB 070508: Suzaku/WAM observation of the prompt emission
  32. GRB 070509: REM observations
  33. GRB070508: Swift/UVOT Observations
  34. GRB 070508, Swift-BAT refined analysis
  35. GRB 070508: REM observations
  36. GRB 070508: TAROT La Silla observatory optical observations
  37. GRB 070508: Swift detection of an intense burst with an optical counterpart
  38. GRB070506: Swift/UVOT Observations
  39. GRB070506: Swift XRT refined analysis
  40. GRB 070506, Swift-BAT Refined Analysis
  41. GRB 070506: Swift detection of a burst with optical afterglow
  42. GRB070429B: VLT observations
  43. GRB070429B: position correction
  44. GRB 070309: Swift-XRT afterglow confirmation
  45. VLA observation of GRB 070429B
  46. Swift/UVOT observations of GRB070429B
  47. GRB 070429B, Swift-BAT refined analysis
  48. Swift/UVOT observations of GRB070429A
  49. GRB 070429A, Swift-BAT refined analysis
  50. GRB 070429A: optical and NIR observations
  51. GRB 070429B: Swift XRT refined analysis
  52. GRB 070429B: ROTSE-III Optical Limits
  53. GRB 070429: ROTSE-III Optical Limits
  54. GRB 070429: Swift detection of a burst
  55. GRB 070427, Swift-BAT Refined Analysis
  56. LT monitoring of GRB070412
  57. GRB 070411: Late-time Keck imaging
  58. GRB070419B: Suzaku WAM observation of the prompt emission
  59. GRB 070420, SMARTS optical/IR afterglow observations
  60. GRB 070411, deep LBT photometry
  61. Konus-Wind observation of GRB 070420
  62. GRB 070411: break in the optical light curve
  63. GRB 070420 Swift-BAT Refined Analysis
  64. GRB 070420: optical rebrightening observed at Mt. John
  65. GRB070420: Swift UVOT continuing observations
  66. GRB 070420: Faulkes Telescope South Observations
  67. GRB 070420: TAROT La Silla observatory optical observations
  68. GRB 070420: NIR and optical afterglow confirmed
  69. GRB 070420: Swift detection of a burst with optical afterglow
  70. GRB 070419A: MITSuME Okayama Observations
  71. GRB 070419A: Early Super-LOTIS Observations
  72. GRB 070419B, Swift-BAT refined analysis
  73. GRB 070419A Swift-BAT Refined Analysis
  74. GRB 070419A, Optical observations
  75. GRB070419 - SDSS Pre-Burst Observations
  76. GRB 070419A: SARA observations
  77. GRB 070419A: NAYUTA Optical Observation
  78. GRB 070419B optical afterglow candidate
  79. GRB 070419A: Optical and IR observations with KANATA
  80. GRB 070419B: optical afterglow candidate
  81. GRB070419A, optical observation
  82. Infrared detection of GRB070419A with UKIRT
  83. GRB 070419A: Kiso Optical observation
  84. GRB 070419: P60 Confirmation of Optical Afterglow
  85. GRB 070419B: Swift detection of a burst
  86. GRB 070419A: ROTSE-III Optical Limits
  87. GRB 070419: Swift detection of a burst
  88. GRB 070418: Optical and IR observations with KANATA
  89. Trigger 276045: Swift detection of a possible burst
  90. GRB 070406: Swift XRT refined analysis
  91. GRB070412: UKIRT-WFCAM JHK upper limits
  92. GRB070412: Swift UVOT observations
  93. GRB 070411: Swift/UVOT observations
  94. GRB 070412, Swift-BAT refined analysis
  95. GRB 070412 Liverpool Telescope optical limit
  96. GRB 070412: Optical observations at Crni Vrh
  97. GRB 070412: further NOT observations
  98. GRB 070412: Gemini/GMOS afterglow candidate
  99. GRB 070412: IAC80 optical afterglow candidate
  100. GRB 070412: NOT observations

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