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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"

45426 results found.

  1. GRB 070612B: Swift/UVOT upper limits
  2. GRB 070612B: FRAM limit
  3. GRB070612B: P60 Observations
  4. GRB 070612B: KAIT limits
  5. GRB 070612A: SARA detection of possible OT
  6. GRB 070612B: Swift XRT position from downlink data
  7. GRB 070610: TAROT Calern observatory optical observations
  8. GRB 070610: MITSuME OAO optical upper limit
  9. GRB 070612B: Swift detection of a burst
  10. GRB070612 - SDSS Pre-Burst Observations
  11. GRB 070612: Swift detection of a burst
  12. GRB 070610: OPTIMA-Burst detection of continued strong flaring activity
  13. GRB 070610: SARA upper limit
  14. GRB 070610: Swift-XRT refined analysis
  15. GRB 070610: TLS RRM sees flaring behaviour - Galactic transient?
  16. GRB 070611: Swift/UVOT Observations
  17. GRB 070611: Swift-XRT refined analysis
  18. GRB 070611, Swift-BAT refined analysis
  19. GRB 070610: Optical observations from OSN
  20. GRB 070610: Watcher Observations
  21. GRB 070611: VLT redshift
  22. GRB 060121 : pseudo-z = 1.9 ('intermediate-duration' burst)
  23. GRB 070611: ROTSE-III Detection of Late Rising Optical Counterpart
  24. GRB 070611; Swift-XRT position
  25. GRB 070611: ROTSE-III Optical Limits
  26. GRB 070611: Swift detection of a burst
  27. GRB 070610: Swift-UVOT Upper Limits
  28. GRB 070610: OPTIMA-Burst high-time-resolution optical observations
  29. GRB 070610, Swift-BAT refined analysis
  30. GRB 070610; Swift-XRT position
  31. GRB 070610: Swift detection of a burst
  32. GRB 070412: TAROT Calern observatory optical observations
  33. GRB 070411: TAROT Calern observatory optical observations
  34. GRB 070419A, deep LBT photometry and possible supernova detection
  35. GRB070520B: optical observations
  36. GRB070520: optical observation
  37. GRB070518: optical observation
  38. GRB070521: optical observation
  39. Swift/UVOT refined analysis of GRB070531
  40. GRB 070531: NOT nIR observations
  41. GRB 070531: Swift-BAT refined analysis
  42. GRB 070531: I-band observations from IAC80
  43. GRB 070531: Swift-XRT position
  44. GRB 070531: Liverpool Telescope Optical Observations
  45. GRB 070531: Swift detection of a burst
  46. GRB 070529: SARA upper limit
  47. Swift/UVOT refined analysis of GRB070529
  48. GRB 070529: MARGE Observations
  49. GRB 070529: Optical aterglow from MIRO
  50. GRB 070529: Gemini Redshift
  51. GRB 070529: Swift-XRT refined analysis
  52. GRB 070529, Swift-BAT refined analysis
  53. GRB 070529: Xinglong TNT Optical Upper Limit
  54. GRB 070529: Swift detection of a burst with an optical aterglow
  55. GRB 070412: Deep Keck imaging
  56. Swift Triggers 280447, 280450 and 280451 are invalid
  57. Swift trigger 280447 is probably a Galactic transient
  58. GRB 070518, deep LBT photometry
  59. GRB 070518: MARGE Observations
  60. GRB 070521: pseudo-z ~ 2.28 from prompt emission spectrum
  61. Konus-Wind observation of GRB 070521
  62. GRB 070518: optical observation
  63. GRB070521: Second Epoch Gemini Imaging
  64. GRB070521: NIR observations
  65. GRB070520B: NIR observations
  66. GRB 070521: Swift/UVOT Upper Limits
  67. GRB 070521, optical observation
  68. GRB 070521: Swift-XRT refined analysis
  69. GRB 070521: Keck imaging
  70. GRB070521: Gemini Observations
  71. GROND upper limits of GRB 070521
  72. GRB 070521 Milagro GeV/TeV Observations
  73. GRB 070520B: SARA upper limit
  74. GRB 070520A: SARA upper limit
  75. GRB 070521: SARA upper limit
  76. GRB 070521: Subaru observations and possible host detection
  77. GRB070518: Optical/NIR observation
  78. GRB 070520B: Swift/UVOT Upper Limits
  79. GRB 070520A: Subaru Observations
  80. GRB 070521, Swift-BAT refined analysis
  81. GRB 070520A: Swift UVOT Upper Limits
  82. GRB 070520B: Swift-XRT refined analysis
  83. GRB 070521: optical limit by Pi of the Sky
  84. GRB070521: P200 Observations
  85. GRB070521 : Faulkes Telescope North Observations
  86. GRB 070521: TAROT La Silla observatory optical observations
  87. GRB070521: Bright SDSS Galaxy Near XRT Error Circle
  88. GRB070521 - SDSS Pre-Burst Observations
  89. GRB 070521: Swift detection of a burst
  90. GRB 070520A: MITSuME Akeno optical upper limits
  91. GRB 070520B, Swift-BAT refined analysis
  92. GRB 070520A, Swift-BAT refined analysis
  93. GRB 070520A: Swift-XRT refined analysis
  94. GRB 070518: TNG observations
  95. GRB 070520B: Swift detection of a burst
  96. GRB 070520: Xinglong EST optical Upper Limit
  97. GRB 070520: Swift detection of a burst
  98. VLA observation of GRB 070518
  99. GRB 070518: Swift-XRT refined analysis
  100. GRB 070517: Gemini optical imaging

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