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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"

25779 results found.

  1. GRB 070610: SARA upper limit
  2. GRB 070610: Swift-XRT refined analysis
  3. GRB 070611: Swift/UVOT Observations
  4. GRB 070611: Swift-XRT refined analysis
  5. GRB 070610: Optical observations from OSN
  6. GRB 070610: Watcher Observations
  7. GRB 060121 : pseudo-z = 1.9 ('intermediate-duration' burst)
  8. GRB 070611: ROTSE-III Optical Limits
  9. GRB 070611: Swift detection of a burst
  10. GRB 070610: Swift-UVOT Upper Limits
  11. GRB 070610: OPTIMA-Burst high-time-resolution optical observations
  12. GRB 070610, Swift-BAT refined analysis
  13. GRB 070412: TAROT Calern observatory optical observations
  14. GRB 070411: TAROT Calern observatory optical observations
  15. GRB 070531: NOT nIR observations
  16. GRB 070531: Swift-BAT refined analysis
  17. GRB 070531: I-band observations from IAC80
  18. GRB 070531: Liverpool Telescope Optical Observations
  19. GRB 070531: Swift detection of a burst
  20. GRB 070529: SARA upper limit
  21. Swift/UVOT refined analysis of GRB070529
  22. GRB 070529: MARGE Observations
  23. GRB 070529: Optical aterglow from MIRO
  24. GRB 070529: Gemini Redshift
  25. GRB 070529: Swift-XRT refined analysis
  26. GRB 070529: Xinglong TNT Optical Upper Limit
  27. GRB 070529: Swift detection of a burst with an optical aterglow
  28. GRB 070412: Deep Keck imaging
  29. Swift trigger 280447 is probably a Galactic transient
  30. Konus-Wind observation of GRB 070521
  31. GRB 070518: optical observation
  32. GRB070521: Second Epoch Gemini Imaging
  33. GRB 070521: Swift/UVOT Upper Limits
  34. GRB 070521, optical observation
  35. GRB 070521: Swift-XRT refined analysis
  36. GRB 070521: Keck imaging
  37. GRB070521: Gemini Observations
  38. GROND upper limits of GRB 070521
  39. GRB 070521 Milagro GeV/TeV Observations
  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. GRB070521 : Faulkes Telescope North Observations
  50. GRB 070521: TAROT La Silla observatory optical observations
  51. GRB070521 - SDSS Pre-Burst Observations
  52. GRB 070521: Swift detection of a burst
  53. GRB 070520A: MITSuME Akeno optical upper limits
  54. GRB 070520A: Swift-XRT refined analysis
  55. GRB 070518: TNG observations
  56. GRB 070520B: Swift detection of a burst
  57. GRB 070520: Xinglong EST optical Upper Limit
  58. GRB 070520: Swift detection of a burst
  59. VLA observation of GRB 070518
  60. GRB 070518: Swift-XRT refined analysis
  61. GRB070518: UVOT refined analysis
  62. GRB 070518: OT confirmed form Xinglong TNT observation
  63. GRB 070518: Swift detection of a burst with optical afterglow
  64. GRB070517: Swift-XRT Refined Analysis
  65. GRB 070517: Optical search
  66. GRB 070517: Swift detection of a burst
  67. GRB 070509: objects inside XRT error circle
  68. GRB 070512: IPN localization and Konus spectrum of a bright burst
  69. GRB 070509: Swift/UVOT Upper Limits
  70. Konus-Wind and Konus-A observation of GRB 070508
  71. GRB070509: Swift-XRT Refined Analysis
  72. RHESSI Spectrum of GRB070508
  73. GRB 070509, Swift-BAT refined analysis
  74. GRB 070508: Suzaku/WAM observation of the prompt emission
  75. GRB 070509: REM observations
  76. GRB 070508: Swift-XRT refined analysis
  77. GRB 070508: REM observations
  78. GRB 070508: TAROT La Silla observatory optical observations
  79. GRB 070508: Swift detection of an intense burst with an optical counterpart
  80. GRB070412: MAGIC telescope GeV observation
  81. GRB070506: Swift/UVOT Observations
  82. GRB070506: Swift XRT refined analysis
  83. GRB 070506, Swift-BAT Refined Analysis
  84. GRB 070506: Swift detection of a burst with optical afterglow
  85. GRB 070429A: Swift XRT further analysis
  86. GRB070429B: VLT observations
  87. GRB070429B: position correction
  88. GRB 070309: Swift-XRT afterglow confirmation
  89. VLA observation of GRB 070429B
  90. Swift/UVOT observations of GRB070429B
  91. Swift/UVOT observations of GRB070429A
  92. GRB 070429A: Swift XRT refined analysis
  93. GRB 070429A: optical and NIR observations
  94. GRB 070429B: Swift XRT refined analysis
  95. GRB 070429B: ROTSE-III Optical Limits
  96. GRB 070429: ROTSE-III Optical Limits
  97. GRB 070429: Swift detection of a burst
  98. GRB 070427, Swift-BAT Refined Analysis
  99. LT monitoring of GRB070412
  100. GRB 070411: Late-time Keck imaging

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