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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"

21469 results found.

  1. GRB 070628: NIR detection of afterglow
  2. GRB 070628, Swift-BAT refined analysis
  3. GRB 070628: TAROT La Silla observatory optical observations
  4. GRB 070628: Swift XRT refined analysis
  5. GRB 070628: Watcher Observations
  6. Swift UVOT Observations of GRB 070628
  7. GRB 070628: Swift detection of a possible burst
  8. INTEGRAL burst GRB070615: X-ray continued observations
  9. GRB 070616 : WIDGET simultaneous optical observations
  10. GRB 070616: Suzaku/WAM observation of the prompt emission
  11. GRB070621: RTT150 optical observations
  12. GRB 070621: VLT optical observations
  13. GRB 070621: Swift/UVOT Upper Limits
  14. Keck Laser Guide Star Adaptive Optics Imaging of GRB 070621
  15. GRB 070621: Swift-BAT refined analysis
  16. WHT observations of GRB070621
  17. GRB070621: Swift XRT refined analysis
  18. GRB 070621: Gemini South optical imaging
  19. GRB 070621: UVOT-enhanced XRT position
  20. GRB 070621: NOT observations
  21. GRB070621: OPTIMA-Burst optical upper limit
  22. GRB 070621: TAROT Calern observatory optical observations
  23. GRB 070621: Watcher Observations
  24. GRB 070621: ROTSE-III Prompt Optical Limits
  25. GRB 070621: Swift detection of a burst
  26. GMRT upper limit of GRB 070610/SWIFT J195509.6+261406 in 610 MHz
  27. Swift/UVOT detection of GRB070616 optical afterglow.
  28. GRB070616: Optical Observation by MITSuME Akeno
  29. GRB 070612B: Optical Observation by MITSuME Akeno
  30. GRB 070616, Swift-BAT further refined analysis
  31. GRB 070616: Swift XRT refined circular
  32. GRB 070616: BTA optical observations
  33. Swift/UVOT observations of GRB070616
  34. GRB 070616: TLS observation
  35. Swift XRT observations of the INTEGRAL burst GRB070615: Possible
  36. GRB 070616, Swift-BAT partial refined analysis
  37. GRB 070616: Swift detection of a burst
  38. GRB 070612B: optical observations
  39. UVOT Observations of INTEGRAL burst GRB070615
  40. SWIFT J195509.6+261406 (GRB 070610): further observations
  41. GRB 070612A: Rapid Decay
  42. GRB 070612A: Suzaku/WAM observation of the prompt emission
  43. SWIFT J195509.6+261406 / GRB 070610: OPTIMA-Burst observations
  44. GRB 070611: Watcher Observations
  45. Swift Trigger 282176 is Cygnus X-1
  46. GRB 070612A: MDM Observations
  47. GRB 070612B: SARA upper limit
  48. GRB 070612B, Swift-BAT refined analysis
  49. GRB 070612A, Swift-BAT refined analysis
  50. GRB 070612B: Swift-XRT refined analysis
  51. SWIFT J195509.6+261406 / GRB 070610: SWIFT continued observations
  52. GRB 070612B: Swift/UVOT upper limits
  53. GRB 070612B: FRAM limit
  54. GRB070612B: P60 Observations
  55. GRB 070612B: KAIT limits
  56. GRB 070612B: Swift XRT position from downlink data
  57. GRB 070610: TAROT Calern observatory optical observations
  58. GRB 070610: MITSuME OAO optical upper limit
  59. GRB 070612B: Swift detection of a burst
  60. GRB 070612: Swift detection of a burst
  61. GRB 070610: Swift-XRT refined analysis
  62. GRB 070610: TLS RRM sees flaring behaviour - Galactic transient?
  63. GRB 070611: Swift/UVOT Observations
  64. GRB 070611: Swift-XRT refined analysis
  65. GRB 070611, Swift-BAT refined analysis
  66. GRB 070610: Optical observations from OSN
  67. GRB 070610: Watcher Observations
  68. GRB 070611: ROTSE-III Detection of Late Rising Optical Counterpart
  69. GRB 070611; Swift-XRT position
  70. GRB 070611: ROTSE-III Optical Limits
  71. GRB 070611: Swift detection of a burst
  72. GRB 070610: Swift-UVOT Upper Limits
  73. GRB 070610: OPTIMA-Burst high-time-resolution optical observations
  74. GRB 070610, Swift-BAT refined analysis
  75. GRB 070610; Swift-XRT position
  76. GRB 070610: Swift detection of a burst
  77. GRB 070412: TAROT Calern observatory optical observations
  78. GRB 070411: TAROT Calern observatory optical observations
  79. GRB070520B: optical observations
  80. GRB070520: optical observation
  81. GRB070521: optical observation
  82. Swift/UVOT refined analysis of GRB070531
  83. GRB 070531: NOT nIR observations
  84. GRB 070531: Swift-BAT refined analysis
  85. GRB 070531: I-band observations from IAC80
  86. GRB 070531: Swift-XRT position
  87. GRB 070531: Liverpool Telescope Optical Observations
  88. GRB 070531: Swift detection of a burst
  89. Swift/UVOT refined analysis of GRB070529
  90. GRB 070529: MARGE Observations
  91. GRB 070529: Optical aterglow from MIRO
  92. GRB 070529: Swift-XRT refined analysis
  93. GRB 070529, Swift-BAT refined analysis
  94. GRB 070529: Swift detection of a burst with an optical aterglow
  95. GRB 070412: Deep Keck imaging
  96. Swift Triggers 280447, 280450 and 280451 are invalid
  97. Swift trigger 280447 is probably a Galactic transient
  98. GRB 070518: MARGE Observations
  99. GRB 070521: pseudo-z ~ 2.28 from prompt emission spectrum
  100. Konus-Wind observation of GRB 070521

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