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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"

14852 results found.

  1. GRB 070612A: Possible WSRT Radio Detection
  2. GRB 070616: BTA optical observations
  3. Swift XRT observations of the INTEGRAL burst GRB070615: Possible
  4. GRB 070616: Swift detection of a burst
  5. GRB 070611: Watcher Observations
  6. GRB 070612A: SARA detection of possible OT
  7. GRB 070612B: Swift detection of a burst
  8. GRB 070612: Swift detection of a burst
  9. GRB 070610: OPTIMA-Burst detection of continued strong flaring activity
  10. GRB 070610: TLS RRM sees flaring behaviour - Galactic transient?
  11. GRB 070611: Swift/UVOT Observations
  12. GRB 070611: ROTSE-III Detection of Late Rising Optical Counterpart
  13. GRB 070611: Swift detection of a burst
  14. GRB 070610: Swift detection of a burst
  15. GRB 070419A, deep LBT photometry and possible supernova detection
  16. GRB 070531: Swift detection of a burst
  17. GRB 070529: Swift detection of a burst with an optical aterglow
  18. GRB 070412: Deep Keck imaging
  19. GRB070521: Second Epoch Gemini Imaging
  20. GRB 070521: Subaru observations and possible host detection
  21. GRB 070521: Swift detection of a burst
  22. GRB 070520B: Swift detection of a burst
  23. GRB 070520: Swift detection of a burst
  24. GRB 070518: Swift detection of a burst with optical afterglow
  25. GRB 070517: Swift detection of a burst
  26. GRB 070509: objects inside XRT error circle
  27. GRB 070510: Swift detection of a possible burst
  28. GRB 070509: Swift detection of a burst
  29. GRB070508: Swift/UVOT Observations
  30. GRB 070508: Optical afterglow detection
  31. GRB 070508: REM observations
  32. GRB 070508: Swift detection of an intense burst with an optical counterpart
  33. GRB 070507: Swift detection of a possible cosmic ray shower event or a possible burst
  34. GRB 070506: Swift detection of a burst with optical afterglow
  35. GRB 070412, deep LBT imaging
  36. GRB070429B: VLT observations
  37. GRB070429B: possible host galaxy detection
  38. GRB 070429B: Swift detection of a short burst
  39. GRB 070429: Swift detection of a burst
  40. GRB 070427: Swift detection of a burst
  41. GRB 070411, further deep LBT photometry
  42. GRB070419A: Kuiper Optical detection
  43. GRB 070420: optical rebrightening observed at Mt. John
  44. GRB070420: Swift UVOT continuing observations
  45. GRB 070420: Swift detection of a burst with optical afterglow
  46. GRB 070419A: RAPTOR Detection of Early Emission
  47. GRB 070419B: optical afterglow confirmation
  48. GRB 070411: Deep VLT detection
  49. GRB 070419A: SARA observations
  50. GRB 070419B optical afterglow candidate
  51. GRB 070419B: optical afterglow candidate
  52. Infrared detection of GRB070419A with UKIRT
  53. GRB 070419B: Swift detection of a burst
  54. GRB 070419 optical afterglow candidate
  55. GRB 070419: Swift detection of a burst
  56. Trigger 276045: Swift detection of a possible burst
  57. GRB 070406: Swift XRT refined analysis
  58. GRB 070412: further NOT observations
  59. GRB 070412: Gemini/GMOS afterglow candidate
  60. GRB 070412: NOT observations
  61. GRB 070412: Swift detection of a burst
  62. GRB 070411: ROTSE-III Detection of Optical Counterpart
  63. GRB 070411: Swift detection of a burst with optical afterglow
  64. GRB 070406: Swift XRT team further analysis
  65. GRB 070406: Swift detection of a burst
  66. UVOT observations of GRB070330
  67. GRB 070330: Swift detection of a burst
  68. GRB 070328: Swift detection of a burst
  69. GRB 070318: Swift detection of a burst with an optical afterglow
  70. GRB 070311: Tautenburg sees afterglow fading
  71. GRB 070311: RAPTOR Detection of Optical Emission
  72. GRB 070311: MDM Optical Detection
  73. GRB 070311: PAIRITEL confirmation of variability of REM candidate
  74. GRB070309: Swift/XRT possible afterglow detection
  75. GRB 070125: Chandra X-ray Confirmation of Jet Break
  76. GRB 070306: NOT observations
  77. GRB 070306: Swift detection of a burst
  78. GRB 070125, deep late-time optical observation
  79. GRB070227: possible X-ray afterglow detection
  80. GRB 070227: Swift detection of a burst in ground analysis
  81. GRB 920925C: optical afterglow candidate
  82. GRB 070224: Swift detection of a burst
  83. GRB 070223: Optical observations
  84. GRB 070220: Swift detection of a burst
  85. GRB 070219: Liverpool Telescope Observations
  86. GRB 070219: Swift detection of a burst
  87. GRB 070209: Redshift of a galaxy in the error circle of XRT source
  88. GRB 070129: MDM I-band Detection
  89. GRB 070209: Swift detection of a short hard burst
  90. GRB 070208: RAPTOR detection of early afterglow onset
  91. GRB 070208: Early IR detection and afterglow astrometry
  92. GRB 070208: Swift detection of a burst
  93. GRB 070125 detection with CARMA
  94. GRB 070125: WSRT Radio Detection
  95. Radio detection of GRB 070125
  96. GRB 070129: Swift detection of a burst
  97. GRB 070125: further AAVSO optical observations
  98. GRB070126: Swift-XRT possible detection of an afterglow
  99. GRB 070125: UVOT Detection in Ultraviolet Filters
  100. GRB 070125: SARA detection in R

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