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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"

21470 results found.

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

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