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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"

42292 results found.

  1. GRB070612A: MITSuME Okayama Observation
  2. GRB 070612A: continued SARA observations
  3. GRB 070612A: spectral lag
  4. GRB 070611: Watcher Observations
  5. Swift Trigger 282176 is Cygnus X-1
  6. GRB 070612A: MDM Observations
  7. GRB 070612A: P60 Confirmation of Afterglow and An Underlying, Nearby
  8. GRB 070612B, Swift-BAT refined analysis
  9. GRB 070612A, Swift-BAT refined analysis
  10. GRB 070612B: Swift-XRT refined analysis
  11. SWIFT J195509.6+261406 / GRB 070610: SWIFT continued observations
  12. GRB070612B: P60 Observations
  13. GRB 070612B: KAIT limits
  14. GRB 070612A: SARA detection of possible OT
  15. GRB 070612B: Swift XRT position from downlink data
  16. GRB 070610: TAROT Calern observatory optical observations
  17. GRB 070610: MITSuME OAO optical upper limit
  18. GRB 070612B: Swift detection of a burst
  19. GRB070612 - SDSS Pre-Burst Observations
  20. GRB 070612: Swift detection of a burst
  21. GRB 070610: OPTIMA-Burst detection of continued strong flaring activity
  22. GRB 070610: SARA upper limit
  23. GRB 070610: Swift-XRT refined analysis
  24. GRB 070610: TLS RRM sees flaring behaviour - Galactic transient?
  25. GRB 070611: Swift/UVOT Observations
  26. GRB 070611: Swift-XRT refined analysis
  27. GRB 070611, Swift-BAT refined analysis
  28. GRB 070610: Optical observations from OSN
  29. GRB 070610: Watcher Observations
  30. GRB 070611: VLT redshift
  31. GRB 060121 : pseudo-z = 1.9 ('intermediate-duration' burst)
  32. GRB 070611: ROTSE-III Detection of Late Rising Optical Counterpart
  33. GRB 070611; Swift-XRT position
  34. GRB 070611: ROTSE-III Optical Limits
  35. GRB 070611: Swift detection of a burst
  36. GRB 070610: Swift-UVOT Upper Limits
  37. GRB 070610: OPTIMA-Burst high-time-resolution optical observations
  38. GRB 070610, Swift-BAT refined analysis
  39. GRB 070610; Swift-XRT position
  40. GRB 070610: Swift detection of a burst
  41. GRB 070412: TAROT Calern observatory optical observations
  42. GRB 070411: TAROT Calern observatory optical observations
  43. GRB 070419A, deep LBT photometry and possible supernova detection
  44. GRB070520B: optical observations
  45. GRB070520: optical observation
  46. GRB070518: optical observation
  47. GRB070521: optical observation
  48. Swift/UVOT refined analysis of GRB070531
  49. GRB 070531: Swift-BAT refined analysis
  50. GRB 070531: Swift-XRT position
  51. GRB 070531: Liverpool Telescope Optical Observations
  52. GRB 070531: Swift detection of a burst
  53. GRB 070529: SARA upper limit
  54. Swift/UVOT refined analysis of GRB070529
  55. GRB 070529: MARGE Observations
  56. GRB 070529: Optical aterglow from MIRO
  57. GRB 070529: Gemini Redshift
  58. GRB 070529: Swift-XRT refined analysis
  59. GRB 070529, Swift-BAT refined analysis
  60. GRB 070529: Xinglong TNT Optical Upper Limit
  61. GRB 070529: Swift detection of a burst with an optical aterglow
  62. GRB 070412: Deep Keck imaging
  63. Swift trigger 280447 is probably a Galactic transient
  64. GRB 070518, deep LBT photometry
  65. GRB 070518: MARGE Observations
  66. GRB 070521: pseudo-z ~ 2.28 from prompt emission spectrum
  67. Konus-Wind observation of GRB 070521
  68. GRB 070518: optical observation
  69. GRB070521: Second Epoch Gemini Imaging
  70. GRB070521: NIR observations
  71. GRB070520B: NIR observations
  72. GRB 070521, optical observation
  73. GRB 070521: Swift-XRT refined analysis
  74. GRB 070521: Keck imaging
  75. GRB070521: Gemini Observations
  76. GROND upper limits of GRB 070521
  77. GRB 070521 Milagro GeV/TeV Observations
  78. GRB 070521: SARA upper limit
  79. GRB 070521: Subaru observations and possible host detection
  80. GRB070518: Optical/NIR observation
  81. GRB 070520A: Subaru Observations
  82. GRB 070521, Swift-BAT refined analysis
  83. GRB 070520B: Swift-XRT refined analysis
  84. GRB 070521: optical limit by Pi of the Sky
  85. GRB070521: P200 Observations
  86. GRB070521 : Faulkes Telescope North Observations
  87. GRB 070521: TAROT La Silla observatory optical observations
  88. GRB070521: Bright SDSS Galaxy Near XRT Error Circle
  89. GRB070521 - SDSS Pre-Burst Observations
  90. GRB 070521: Swift detection of a burst
  91. GRB 070520A: MITSuME Akeno optical upper limits
  92. GRB 070520B, Swift-BAT refined analysis
  93. GRB 070520A, Swift-BAT refined analysis
  94. GRB 070520A: Swift-XRT refined analysis
  95. GRB 070518: TNG observations
  96. GRB 070520B: Swift detection of a burst
  97. GRB 070520: Xinglong EST optical Upper Limit
  98. GRB 070520: Swift detection of a burst
  99. GRB 070518: Swift-XRT refined analysis
  100. GRB 070517: Gemini optical imaging

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