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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"

28048 results found.

  1. GRB 070612B: Swift/UVOT upper limits
  2. GRB 070612B: FRAM limit
  3. GRB070612B: P60 Observations
  4. GRB 070612A: SARA detection of possible OT
  5. GRB 070610: TAROT Calern observatory optical observations
  6. GRB 070610: MITSuME OAO optical upper limit
  7. GRB070612 - SDSS Pre-Burst Observations
  8. GRB 070612: Swift detection of a burst
  9. GRB 070610: OPTIMA-Burst detection of continued strong flaring activity
  10. GRB 070610: SARA upper limit
  11. GRB 070610: Swift-XRT refined analysis
  12. GRB 070611: Swift/UVOT Observations
  13. GRB 070611: Swift-XRT refined analysis
  14. GRB 070611, Swift-BAT refined analysis
  15. GRB 070610: Optical observations from OSN
  16. GRB 070610: Watcher Observations
  17. GRB 070611: ROTSE-III Detection of Late Rising Optical Counterpart
  18. GRB 070611: ROTSE-III Optical Limits
  19. GRB 070610: Swift-UVOT Upper Limits
  20. GRB 070610: OPTIMA-Burst high-time-resolution optical observations
  21. GRB 070610, Swift-BAT refined analysis
  22. GRB 070412: TAROT Calern observatory optical observations
  23. GRB 070411: TAROT Calern observatory optical observations
  24. GRB070520B: optical observations
  25. GRB070520: optical observation
  26. GRB070518: optical observation
  27. GRB070521: optical observation
  28. GRB 070531: NOT nIR observations
  29. GRB 070531: Swift-BAT refined analysis
  30. GRB 070531: I-band observations from IAC80
  31. GRB 070531: Liverpool Telescope Optical Observations
  32. GRB 070529: SARA upper limit
  33. Swift/UVOT refined analysis of GRB070529
  34. GRB 070529: Optical aterglow from MIRO
  35. GRB 070529: Swift-XRT refined analysis
  36. GRB 070529, Swift-BAT refined analysis
  37. GRB 070529: Xinglong TNT Optical Upper Limit
  38. GRB 070529: Swift detection of a burst with an optical aterglow
  39. GRB 070412: Deep Keck imaging
  40. Swift trigger 280447 is probably a Galactic transient
  41. GRB 070518, deep LBT photometry
  42. Konus-Wind observation of GRB 070521
  43. GRB070521: Second Epoch Gemini Imaging
  44. GRB 070521: Swift/UVOT Upper Limits
  45. GRB 070521, optical observation
  46. GRB 070521: Swift-XRT refined analysis
  47. GRB 070521: Keck imaging
  48. GRB070521: Gemini Observations
  49. GROND upper limits of GRB 070521
  50. GRB 070520B: SARA upper limit
  51. GRB 070520A: SARA upper limit
  52. GRB 070521: SARA upper limit
  53. GRB 070521: Subaru observations and possible host detection
  54. GRB 070520B: Swift/UVOT Upper Limits
  55. GRB 070520A: Subaru Observations
  56. GRB 070521, Swift-BAT refined analysis
  57. GRB 070520A: Swift UVOT Upper Limits
  58. GRB 070520B: Swift-XRT refined analysis
  59. GRB 070521: TAROT La Silla observatory optical observations
  60. GRB070521 - SDSS Pre-Burst Observations
  61. GRB 070521: Swift detection of a burst
  62. GRB 070520A: MITSuME Akeno optical upper limits
  63. GRB 070520B, Swift-BAT refined analysis
  64. GRB 070520A, Swift-BAT refined analysis
  65. GRB 070520A: Swift-XRT refined analysis
  66. GRB 070518: TNG observations
  67. GRB 070520B: Swift detection of a burst
  68. GRB 070520: Xinglong EST optical Upper Limit
  69. GRB 070520: Swift detection of a burst
  70. VLA observation of GRB 070518
  71. GRB 070518: Swift-XRT refined analysis
  72. GRB070518: UVOT refined analysis
  73. GRB 070518, Swift-BAT refined analysis
  74. GRB 070518: OT confirmed form Xinglong TNT observation
  75. GRB 070518: Swift detection of a burst with optical afterglow
  76. GRB070517: Swift-XRT Refined Analysis
  77. GRB 070517, Swift-BAT refined analysis
  78. GRB 070517: Optical search
  79. GRB 070517: Swift detection of a burst
  80. GRB 070509: objects inside XRT error circle
  81. GRB 070512: IPN localization and Konus spectrum of a bright burst
  82. GRB070419A: optical observations
  83. GRB 070509: Swift/UVOT Upper Limits
  84. Konus-Wind and Konus-A observation of GRB 070508
  85. GRB 070510: Swift detection of a possible burst
  86. GRB070509: Swift-XRT Refined Analysis
  87. GRB 070509, Swift-BAT refined analysis
  88. GRB 070508: Suzaku/WAM observation of the prompt emission
  89. GRB 070509: REM observations
  90. GRB070508: Swift/UVOT Observations
  91. GRB 070508, Swift-BAT refined analysis
  92. GRB 070508: REM observations
  93. GRB 070508: TAROT La Silla observatory optical observations
  94. GRB 070508: Swift detection of an intense burst with an optical counterpart
  95. GRB070506: Swift/UVOT Observations
  96. GRB070506: Swift XRT refined analysis
  97. GRB 070506, Swift-BAT Refined Analysis
  98. GRB 070506: Swift detection of a burst with optical afterglow
  99. GRB070429B: VLT observations
  100. GRB070429B: position correction

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