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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"

27578 results found.

  1. GRB 070616, Swift-BAT further refined analysis
  2. GRB 070616: Swift XRT refined circular
  3. Swift/UVOT observations of GRB070616
  4. GRB 070616: TLS observation
  5. Swift XRT observations of the INTEGRAL burst GRB070615: Possible
  6. GRB 070616, Swift-BAT partial refined analysis
  7. GRB 070616: Swift detection of a burst
  8. UVOT Observations of INTEGRAL burst GRB070615
  9. GRB 070615
  10. GRB 070612A: Super-LOTIS observations
  11. GRB 070612A: Suzaku/WAM observation of the prompt emission
  12. GRB 070612A: continued SARA observations
  13. GRB 070612A: spectral lag
  14. GRB 070611: Watcher Observations
  15. Swift Trigger 282176 is Cygnus X-1
  16. GRB 070612A: P60 Confirmation of Afterglow and An Underlying, Nearby
  17. GRB 070612B: SARA upper limit
  18. GRB 070612B, Swift-BAT refined analysis
  19. GRB 070612A, Swift-BAT refined analysis
  20. SWIFT J195509.6+261406 / GRB 070610: SWIFT continued observations
  21. GRB 070612B: Swift/UVOT upper limits
  22. GRB 070612B: FRAM limit
  23. GRB 070612B: KAIT limits
  24. GRB 070612A: SARA detection of possible OT
  25. GRB 070612B: Swift XRT position from downlink data
  26. GRB 070610: TAROT Calern observatory optical observations
  27. GRB 070612B: Swift detection of a burst
  28. GRB 070612: Swift detection of a burst
  29. GRB 070610: SARA upper limit
  30. GRB 070610: Swift-XRT refined analysis
  31. GRB 070610: TLS RRM sees flaring behaviour - Galactic transient?
  32. GRB 070611: Swift/UVOT Observations
  33. GRB 070611, Swift-BAT refined analysis
  34. GRB 070610: Watcher Observations
  35. GRB 070611: ROTSE-III Detection of Late Rising Optical Counterpart
  36. GRB 070611; Swift-XRT position
  37. GRB 070611: ROTSE-III Optical Limits
  38. GRB 070611: Swift detection of a burst
  39. GRB 070610: Swift-UVOT Upper Limits
  40. GRB 070610: OPTIMA-Burst high-time-resolution optical observations
  41. GRB 070610, Swift-BAT refined analysis
  42. GRB 070610; Swift-XRT position
  43. GRB 070610: Swift detection of a burst
  44. GRB 070412: TAROT Calern observatory optical observations
  45. GRB 070411: TAROT Calern observatory optical observations
  46. Swift/UVOT refined analysis of GRB070531
  47. GRB 070531: Swift-BAT refined analysis
  48. GRB 070531: Swift-XRT position
  49. GRB 070531: Liverpool Telescope Optical Observations
  50. GRB 070531: Swift detection of a burst
  51. Swift/UVOT refined analysis of GRB070529
  52. GRB 070529: MARGE Observations
  53. GRB 070529: Optical aterglow from MIRO
  54. GRB 070529: Swift-XRT refined analysis
  55. GRB 070529, Swift-BAT refined analysis
  56. GRB 070529: Swift detection of a burst with an optical aterglow
  57. GRB 070412: Deep Keck imaging
  58. Swift Triggers 280447, 280450 and 280451 are invalid
  59. Swift trigger 280447 is probably a Galactic transient
  60. GRB 070518: MARGE Observations
  61. GRB 070521: pseudo-z ~ 2.28 from prompt emission spectrum
  62. Konus-Wind observation of GRB 070521
  63. GRB070520B: NIR observations
  64. GRB 070521: Swift/UVOT Upper Limits
  65. GRB 070521, optical observation
  66. GRB 070521: Swift-XRT refined analysis
  67. GROND upper limits of GRB 070521
  68. GRB 070520B: SARA upper limit
  69. GRB 070521: SARA upper limit
  70. GRB 070521: Subaru observations and possible host detection
  71. GRB070518: Optical/NIR observation
  72. GRB 070520B: Swift/UVOT Upper Limits
  73. GRB 070521, Swift-BAT refined analysis
  74. GRB 070520A: Swift UVOT Upper Limits
  75. GRB 070520B: Swift-XRT refined analysis
  76. GRB 070521: optical limit by Pi of the Sky
  77. GRB070521 : Faulkes Telescope North Observations
  78. GRB 070521: TAROT La Silla observatory optical observations
  79. GRB070521 - SDSS Pre-Burst Observations
  80. GRB 070521: Swift detection of a burst
  81. GRB 070520A: MITSuME Akeno optical upper limits
  82. GRB 070520B, Swift-BAT refined analysis
  83. GRB 070520A, Swift-BAT refined analysis
  84. GRB 070520A: Swift-XRT refined analysis
  85. GRB 070520B: Swift detection of a burst
  86. GRB 070520: Swift detection of a burst
  87. GRB 070518: Swift-XRT refined analysis
  88. GRB070518: UVOT refined analysis
  89. GRB 070518, Swift-BAT refined analysis
  90. GRB 070518: Swift detection of a burst with optical afterglow
  91. GRB070517: Swift-XRT Refined Analysis
  92. GRB 070517, Swift-BAT refined analysis
  93. GRB 070517: Swift detection of a burst
  94. GRB 070512: IPN localization and Konus spectrum of a bright burst
  95. GRB 070508: pseudo-z from 4 different spectral analyses
  96. GRB 070509: Swift/UVOT Upper Limits
  97. Konus-Wind and Konus-A observation of GRB 070508
  98. Swift-BAT trigger 278987 is not a GRB
  99. GRB 070510: Swift detection of a possible burst
  100. GRB070509: Swift-XRT Refined Analysis

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