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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"

21471 results found.

  1. GRB 070704: Swift detection of a burst
  2. GRB 070628 Swift-UVOT Refined Analysis
  3. GRB 070628: NIR detection of afterglow
  4. GRB 070628, Swift-BAT refined analysis
  5. GRB 070628: TAROT La Silla observatory optical observations
  6. GRB 070628: Swift XRT refined analysis
  7. GRB 070628: Watcher Observations
  8. Swift UVOT Observations of GRB 070628
  9. GRB 070628: Swift detection of a possible burst
  10. INTEGRAL burst GRB070615: X-ray continued observations
  11. GRB 070616 : WIDGET simultaneous optical observations
  12. GRB 070616: Suzaku/WAM observation of the prompt emission
  13. GRB070621: RTT150 optical observations
  14. GRB 070621: VLT optical observations
  15. GRB 070621: Swift/UVOT Upper Limits
  16. Keck Laser Guide Star Adaptive Optics Imaging of GRB 070621
  17. GRB 070621: Swift-BAT refined analysis
  18. WHT observations of GRB070621
  19. GRB070621: Swift XRT refined analysis
  20. GRB 070621: Gemini South optical imaging
  21. GRB 070621: UVOT-enhanced XRT position
  22. GRB 070621: NOT observations
  23. GRB070621: OPTIMA-Burst optical upper limit
  24. GRB 070621: TAROT Calern observatory optical observations
  25. GRB 070621: Watcher Observations
  26. GRB 070621: ROTSE-III Prompt Optical Limits
  27. GRB 070621: Swift detection of a burst
  28. GMRT upper limit of GRB 070610/SWIFT J195509.6+261406 in 610 MHz
  29. Swift/UVOT detection of GRB070616 optical afterglow.
  30. GRB070616: Optical Observation by MITSuME Akeno
  31. GRB 070612B: Optical Observation by MITSuME Akeno
  32. GRB 070616, Swift-BAT further refined analysis
  33. GRB 070616: Swift XRT refined circular
  34. GRB 070616: BTA optical observations
  35. Swift/UVOT observations of GRB070616
  36. GRB 070616: TLS observation
  37. Swift XRT observations of the INTEGRAL burst GRB070615: Possible
  38. GRB 070616, Swift-BAT partial refined analysis
  39. GRB 070616: Swift detection of a burst
  40. GRB 070612B: optical observations
  41. UVOT Observations of INTEGRAL burst GRB070615
  42. SWIFT J195509.6+261406 (GRB 070610): further observations
  43. GRB 070612A: Rapid Decay
  44. GRB 070612A: Suzaku/WAM observation of the prompt emission
  45. SWIFT J195509.6+261406 / GRB 070610: OPTIMA-Burst observations
  46. GRB 070611: Watcher Observations
  47. Swift Trigger 282176 is Cygnus X-1
  48. GRB 070612A: MDM Observations
  49. GRB 070612B: SARA upper limit
  50. GRB 070612B, Swift-BAT refined analysis
  51. GRB 070612A, Swift-BAT refined analysis
  52. GRB 070612B: Swift-XRT refined analysis
  53. SWIFT J195509.6+261406 / GRB 070610: SWIFT continued observations
  54. GRB 070612B: Swift/UVOT upper limits
  55. GRB 070612B: FRAM limit
  56. GRB070612B: P60 Observations
  57. GRB 070612B: KAIT limits
  58. GRB 070612B: Swift XRT position from downlink data
  59. GRB 070610: TAROT Calern observatory optical observations
  60. GRB 070610: MITSuME OAO optical upper limit
  61. GRB 070612B: Swift detection of a burst
  62. GRB 070612: Swift detection of a burst
  63. GRB 070610: Swift-XRT refined analysis
  64. GRB 070610: TLS RRM sees flaring behaviour - Galactic transient?
  65. GRB 070611: Swift/UVOT Observations
  66. GRB 070611: Swift-XRT refined analysis
  67. GRB 070611, Swift-BAT refined analysis
  68. GRB 070610: Optical observations from OSN
  69. GRB 070610: Watcher Observations
  70. GRB 070611: ROTSE-III Detection of Late Rising Optical Counterpart
  71. GRB 070611; Swift-XRT position
  72. GRB 070611: ROTSE-III Optical Limits
  73. GRB 070611: Swift detection of a burst
  74. GRB 070610: Swift-UVOT Upper Limits
  75. GRB 070610: OPTIMA-Burst high-time-resolution optical observations
  76. GRB 070610, Swift-BAT refined analysis
  77. GRB 070610; Swift-XRT position
  78. GRB 070610: Swift detection of a burst
  79. GRB 070412: TAROT Calern observatory optical observations
  80. GRB 070411: TAROT Calern observatory optical observations
  81. GRB070520B: optical observations
  82. GRB070520: optical observation
  83. GRB070521: optical observation
  84. Swift/UVOT refined analysis of GRB070531
  85. GRB 070531: NOT nIR observations
  86. GRB 070531: Swift-BAT refined analysis
  87. GRB 070531: I-band observations from IAC80
  88. GRB 070531: Swift-XRT position
  89. GRB 070531: Liverpool Telescope Optical Observations
  90. GRB 070531: Swift detection of a burst
  91. Swift/UVOT refined analysis of GRB070529
  92. GRB 070529: MARGE Observations
  93. GRB 070529: Optical aterglow from MIRO
  94. GRB 070529: Swift-XRT refined analysis
  95. GRB 070529, Swift-BAT refined analysis
  96. GRB 070529: Swift detection of a burst with an optical aterglow
  97. GRB 070412: Deep Keck imaging
  98. Swift Triggers 280447, 280450 and 280451 are invalid
  99. Swift trigger 280447 is probably a Galactic transient
  100. GRB 070518: MARGE Observations

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