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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"

28038 results found.

  1. GRB 070610: Swift-XRT refined analysis
  2. GRB 070611: Swift/UVOT Observations
  3. GRB 070611: Swift-XRT refined analysis
  4. GRB 070611, Swift-BAT refined analysis
  5. GRB 070610: Optical observations from OSN
  6. GRB 070610: Watcher Observations
  7. GRB 070611: ROTSE-III Detection of Late Rising Optical Counterpart
  8. GRB 070611: ROTSE-III Optical Limits
  9. GRB 070610: Swift-UVOT Upper Limits
  10. GRB 070610: OPTIMA-Burst high-time-resolution optical observations
  11. GRB 070610, Swift-BAT refined analysis
  12. GRB 070412: TAROT Calern observatory optical observations
  13. GRB 070411: TAROT Calern observatory optical observations
  14. GRB070520B: optical observations
  15. GRB070520: optical observation
  16. GRB070518: optical observation
  17. GRB070521: optical observation
  18. GRB 070531: NOT nIR observations
  19. GRB 070531: Swift-BAT refined analysis
  20. GRB 070531: I-band observations from IAC80
  21. GRB 070531: Liverpool Telescope Optical Observations
  22. GRB 070529: SARA upper limit
  23. Swift/UVOT refined analysis of GRB070529
  24. GRB 070529: Optical aterglow from MIRO
  25. GRB 070529: Swift-XRT refined analysis
  26. GRB 070529, Swift-BAT refined analysis
  27. GRB 070529: Xinglong TNT Optical Upper Limit
  28. GRB 070529: Swift detection of a burst with an optical aterglow
  29. GRB 070412: Deep Keck imaging
  30. Swift trigger 280447 is probably a Galactic transient
  31. GRB 070518, deep LBT photometry
  32. Konus-Wind observation of GRB 070521
  33. GRB070521: Second Epoch Gemini Imaging
  34. GRB 070521: Swift/UVOT Upper Limits
  35. GRB 070521, optical observation
  36. GRB 070521: Swift-XRT refined analysis
  37. GRB 070521: Keck imaging
  38. GRB070521: Gemini Observations
  39. GROND upper limits of GRB 070521
  40. GRB 070520B: SARA upper limit
  41. GRB 070520A: SARA upper limit
  42. GRB 070521: SARA upper limit
  43. GRB 070521: Subaru observations and possible host detection
  44. GRB 070520B: Swift/UVOT Upper Limits
  45. GRB 070520A: Subaru Observations
  46. GRB 070521, Swift-BAT refined analysis
  47. GRB 070520A: Swift UVOT Upper Limits
  48. GRB 070520B: Swift-XRT refined analysis
  49. GRB 070521: TAROT La Silla observatory optical observations
  50. GRB070521 - SDSS Pre-Burst Observations
  51. GRB 070521: Swift detection of a burst
  52. GRB 070520A: MITSuME Akeno optical upper limits
  53. GRB 070520B, Swift-BAT refined analysis
  54. GRB 070520A, Swift-BAT refined analysis
  55. GRB 070520A: Swift-XRT refined analysis
  56. GRB 070518: TNG observations
  57. GRB 070520B: Swift detection of a burst
  58. GRB 070520: Xinglong EST optical Upper Limit
  59. GRB 070520: Swift detection of a burst
  60. VLA observation of GRB 070518
  61. GRB 070518: Swift-XRT refined analysis
  62. GRB070518: UVOT refined analysis
  63. GRB 070518, Swift-BAT refined analysis
  64. GRB 070518: OT confirmed form Xinglong TNT observation
  65. GRB 070518: Swift detection of a burst with optical afterglow
  66. GRB070517: Swift-XRT Refined Analysis
  67. GRB 070517, Swift-BAT refined analysis
  68. GRB 070517: Optical search
  69. GRB 070517: Swift detection of a burst
  70. GRB 070509: objects inside XRT error circle
  71. GRB 070512: IPN localization and Konus spectrum of a bright burst
  72. GRB070419A: optical observations
  73. GRB 070509: Swift/UVOT Upper Limits
  74. Konus-Wind and Konus-A observation of GRB 070508
  75. GRB 070510: Swift detection of a possible burst
  76. GRB070509: Swift-XRT Refined Analysis
  77. GRB 070509, Swift-BAT refined analysis
  78. GRB 070508: Suzaku/WAM observation of the prompt emission
  79. GRB 070509: REM observations
  80. GRB070508: Swift/UVOT Observations
  81. GRB 070508, Swift-BAT refined analysis
  82. GRB 070508: REM observations
  83. GRB 070508: TAROT La Silla observatory optical observations
  84. GRB 070508: Swift detection of an intense burst with an optical counterpart
  85. GRB070506: Swift/UVOT Observations
  86. GRB070506: Swift XRT refined analysis
  87. GRB 070506, Swift-BAT Refined Analysis
  88. GRB 070506: Swift detection of a burst with optical afterglow
  89. GRB070429B: VLT observations
  90. GRB070429B: position correction
  91. GRB 070309: Swift-XRT afterglow confirmation
  92. VLA observation of GRB 070429B
  93. Swift/UVOT observations of GRB070429B
  94. GRB 070429B, Swift-BAT refined analysis
  95. Swift/UVOT observations of GRB070429A
  96. GRB 070429A, Swift-BAT refined analysis
  97. GRB 070429A: optical and NIR observations
  98. GRB 070429B: Swift XRT refined analysis
  99. GRB 070429B: ROTSE-III Optical Limits
  100. GRB 070429: ROTSE-III Optical Limits

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