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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"

27480 results found.

  1. GRB 070328: Swift/UVOT Upper Limits
  2. GRB 070328: Swift/XRT Refined Analysis
  3. GRB 070328, Swift-BAT refined analysis
  4. GRB 070328: Swift detection of a burst
  5. GRB070318: Swift UVOT indicates unusual optical/UV afterglow
  6. Short-Hard GRB 070209: PROMPT Observations
  7. GRB 070318: Gemini + Magellan spectra
  8. GRB070318: Swift UVOT continuing observations
  9. GRB070318: Swift-XRT refined analysis
  10. GRB 070318: Swift/UVOT Continued Observations
  11. GRB 070318, Swift-BAT refined analysis
  12. IBAS Alert n. 4176: not a GRB
  13. GRB 070318: Swift detection of a burst with an optical afterglow
  14. IBAS Alert n. 4169: not a GRB
  15. GRB 070311: SARA upper limit
  16. GRB 070311: RAPTOR Detection of Optical Emission
  17. GRB070311: FRAM early follow-up limit
  18. GRB 070311: Swift/UVOT Upper Limits
  19. GRB 070311: Swift-XRT refined analysis
  20. GRB 070311: REM candidate afterglow
  21. GRB 070309: Swift/UVOT Upper Limits
  22. GRB 070306, optical observation
  23. IBAS Alert 4162: Not a GRB
  24. GRB 070306 Swift/UVOT refined analysis
  25. GRB070306: confirmation of near infrared afterglow
  26. GRB 070306: ART-3 early optical and near infrared constraints
  27. GRB 070306, Swift-BAT refined analysis
  28. GRB 070306: XRT Team Refined Analysis
  29. GRB070306 - SDSS Pre-burst Observations
  30. GRB 070306: Swift detection of a burst
  31. GRB070227: Swift-XRT refined analysis
  32. GRB 070227: optical observations
  33. GRB 070227: optical observations
  34. GRB 070227: Swift/UVOT Upper Limits
  35. GRB 070227: TAROT La Silla observatory optical observations
  36. GRB 070227, Swift-BAT refined analysis
  37. GRB070227: possible X-ray afterglow detection
  38. GRB 070227: Swift detection of a burst in ground analysis
  39. IBAS Alert n. 4144: not a GRB
  40. GRB 070224: Swift/UVOT Upper Limits
  41. GRB070224: Magellan Imaging Observations
  42. GRB070224: Gemini Imaging Observations
  43. GRB 070224: SARA upper limit
  44. GRB070224: Swift-XRT Refined Analysis
  45. GRB 070224, Swift-BAT refined analysis
  46. GRB 070224: MASTER-Net refind analysis
  47. GRB 070224: MASTER-VWF-Kislovodsk observations
  48. GRB 070224: Swift detection of a burst
  49. GRB070223: Swift/UVOT refined analysis
  50. GRB 070223, Swift-BAT refined analysis
  51. GRB070223: MASTER-VWF-Kislovodsk observations
  52. GRB 070223: Swift-XRT Refined Analysis
  53. GRB 070220: pseudo-z~2.15 from spectral parameters of the prompt
  54. GRB 070223: Liverpool Telescope Possible Afterglow Candidate
  55. GRB070223: Swift burst
  56. Konus-Wind and Konus-A observations of GRB 070220
  57. GRB 070220 Swift-BAT Refined Analysis
  58. Swift/UVOT refined analysis of GRB070220
  59. GRB 070209: Swift XRT refined analysis
  60. GRB 070220: Swift-XRT Refined Analysis
  61. GRB 070220 : Faulkes Telescope North optical limit
  62. GRB 070220: Swift detection of a burst
  63. GRB070219: MASTER-VWF-Kislovodsk observations
  64. GRB 070219: XRT Refined Analysis
  65. GRB 070219: Swift/UVOT Upper limits
  66. GRB 070219, Swift-BAT refined analysis
  67. GRB 070219: Liverpool Telescope Observations
  68. GRB 070219: ROTSE-III Optical Limits
  69. GRB070219 - SDSS Pre-Burst Observations
  70. GRB 070219: Swift detection of a burst
  71. GRB 070209: Redshift of a galaxy in the error circle of XRT source
  72. Swift-BAT trigger 260304 is NOT a burst or transient
  73. GRB 070209: Swift XRT analysis
  74. IPN localization of very bright long hard GRB 070207
  75. IPN localization of very intense short GRB 070201
  76. GRB 070209, Swift-BAT refined analysis of the short hard burst
  77. GRB 070209: Swift detection of a short hard burst
  78. GRB 070208: Swift XRT refined analysis
  79. GRB 070208: RAPTOR detection of early afterglow onset
  80. GRB 070208, Swift-BAT refined analysis
  81. GRB 070208: Early IR detection and afterglow astrometry
  82. GRB070208: Faulkes Telescope North Afterglow Identification
  83. GRB 070208: ROTSE-III Optical Limits
  84. GRB 070208: MDM Observations
  85. GRB 070208: Swift detection of a burst
  86. Swift-BAT trigger 259527 is a Cosmic Ray Shower
  87. GRB070126: Swift-XRT Observation
  88. GRB 070129: Swift/UVOT Upper limits
  89. GRB 070129: dust-scattered X-ray halo detected by Swift/XRT
  90. GRB070129: MITSuME optical observation
  91. GRB061217: MAGIC telescope GeV observation
  92. GRB 070129, Swift-BAT refined analysis of a particularly long
  93. GRB 070129: Swift-XRT Refined Analysis
  94. GRB 070129: Swift detection of a burst
  95. GRB 070126: Swift/UVOT refined analysis
  96. GRB 070126: VLT observations
  97. GRB070126: Swift-XRT possible detection of an afterglow
  98. GRB 070125: UVOT Detection in Ultraviolet Filters
  99. GRB 070126, Swift-BAT refined analysis of a very faint burst
  100. GRB070124: Swift-XRT Observation

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