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GCN Circulars

GCN Circulars are rapid bulletins submitted by and distributed to the community. 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"

36105 results found.

  1. GRB 070610: MITSuME OAO optical upper limit
  2. GRB 070612B: Swift detection of a burst
  3. GRB070612 - SDSS Pre-Burst Observations
  4. GRB 070612: Swift detection of a burst
  5. GRB 070610: OPTIMA-Burst detection of continued strong flaring activity
  6. GRB 070610: SARA upper limit
  7. GRB 070610: Swift-XRT refined analysis
  8. GRB 070610: TLS RRM sees flaring behaviour - Galactic transient?
  9. GRB 070611: Swift/UVOT Observations
  10. GRB 070611: Swift-XRT refined analysis
  11. GRB 070611, Swift-BAT refined analysis
  12. GRB 070610: Optical observations from OSN
  13. GRB 070610: Watcher Observations
  14. GRB 070611: VLT redshift
  15. GRB 060121 : pseudo-z = 1.9 ('intermediate-duration' burst)
  16. GRB 070611: ROTSE-III Detection of Late Rising Optical Counterpart
  17. GRB 070611; Swift-XRT position
  18. GRB 070611: ROTSE-III Optical Limits
  19. GRB 070611: Swift detection of a burst
  20. GRB 070610: Swift-UVOT Upper Limits
  21. GRB 070610: OPTIMA-Burst high-time-resolution optical observations
  22. GRB 070610, Swift-BAT refined analysis
  23. GRB 070610; Swift-XRT position
  24. GRB 070610: Swift detection of a burst
  25. GRB 070412: TAROT Calern observatory optical observations
  26. GRB 070411: TAROT Calern observatory optical observations
  27. GRB 070419A, deep LBT photometry and possible supernova detection
  28. GRB070520B: optical observations
  29. GRB070520: optical observation
  30. GRB070518: optical observation
  31. GRB070521: optical observation
  32. GRB 070531: NOT nIR observations
  33. GRB 070531: Swift-BAT refined analysis
  34. GRB 070531: I-band observations from IAC80
  35. GRB 070531: Swift-XRT position
  36. GRB 070531: Liverpool Telescope Optical Observations
  37. GRB 070531: Swift detection of a burst
  38. GRB 070529: SARA upper limit
  39. GRB 070529: MARGE Observations
  40. GRB 070529: Optical aterglow from MIRO
  41. GRB 070529: Gemini Redshift
  42. GRB 070529: Swift-XRT refined analysis
  43. GRB 070529, Swift-BAT refined analysis
  44. GRB 070529: Xinglong TNT Optical Upper Limit
  45. GRB 070529: Swift detection of a burst with an optical aterglow
  46. GRB 070412: Deep Keck imaging
  47. Swift trigger 280447 is probably a Galactic transient
  48. GRB 070518, deep LBT photometry
  49. GRB 070518: MARGE Observations
  50. GRB 070521: pseudo-z ~ 2.28 from prompt emission spectrum
  51. Konus-Wind observation of GRB 070521
  52. GRB 070518: optical observation
  53. GRB070520B: NIR observations
  54. GRB 070521: Swift/UVOT Upper Limits
  55. GRB 070521, optical observation
  56. GRB 070521: Swift-XRT refined analysis
  57. GRB 070521: Keck imaging
  58. GROND upper limits of GRB 070521
  59. GRB 070521 Milagro GeV/TeV Observations
  60. GRB 070520B: SARA upper limit
  61. GRB 070520A: SARA upper limit
  62. GRB 070521: SARA upper limit
  63. GRB 070521: Subaru observations and possible host detection
  64. GRB 070520B: Swift/UVOT Upper Limits
  65. GRB 070520A: Subaru Observations
  66. GRB 070521, Swift-BAT refined analysis
  67. GRB 070520A: Swift UVOT Upper Limits
  68. GRB 070520B: Swift-XRT refined analysis
  69. GRB 070521: optical limit by Pi of the Sky
  70. GRB070521 : Faulkes Telescope North Observations
  71. GRB 070521: TAROT La Silla observatory optical observations
  72. GRB070521: Bright SDSS Galaxy Near XRT Error Circle
  73. GRB070521 - SDSS Pre-Burst Observations
  74. GRB 070521: Swift detection of a burst
  75. GRB 070520A: MITSuME Akeno optical upper limits
  76. GRB 070520B, Swift-BAT refined analysis
  77. GRB 070520A, Swift-BAT refined analysis
  78. GRB 070520A: Swift-XRT refined analysis
  79. GRB 070518: TNG observations
  80. GRB 070520B: Swift detection of a burst
  81. GRB 070520: Xinglong EST optical Upper Limit
  82. GRB 070520: Swift detection of a burst
  83. VLA observation of GRB 070518
  84. GRB 070518: Swift-XRT refined analysis
  85. GRB 070517: Gemini optical imaging
  86. GRB070518: OSN observation
  87. GRB 070518, Swift-BAT refined analysis
  88. GRB 070518: OT confirmed form Xinglong TNT observation
  89. GRB 070518: Swift detection of a burst with optical afterglow
  90. GRB 070517, Swift-BAT refined analysis
  91. GRB 070517: Optical search
  92. GRB 070517: Swift detection of a burst
  93. GRB 070509: objects inside XRT error circle
  94. GRB 070512: pseudo-z ~ 1.39 from prompt emission spectrum
  95. GRB 070512: IPN localization and Konus spectrum of a bright burst
  96. GRB070419A: optical observations
  97. GRB 070419A, Deep LBT photometry
  98. GRB 070508: pseudo-z from 4 different spectral analyses
  99. GRB 070509: Swift/UVOT Upper Limits
  100. Konus-Wind and Konus-A observation of GRB 070508

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