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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"

19663 results found.

  1. GRB 120311B: C88 optical limits
  2. GRB 120312A: Swift detection of a burst
  3. GRB 120311B: Swift/UVOT Upper Limits
  4. GRB 120311B: Faulkes Telescope North observations
  5. GRB 120311B: Swift-XRT refined Analysis
  6. GRB 120311A: Swift-XRT refined Analysis
  7. GRB 120311B: Enhanced Swift-XRT position
  8. GRB 120311B: Swift-BAT refined analysis
  9. GRB 120311B: Swift-XRT observations
  10. GRB 120311A, Swift-BAT refined analysis
  11. GRB 120311B: Swift detection of a burst
  12. GRB 120311A: Swift/UVOT Upper Limits
  13. GRB 120311A: Enhanced Swift-XRT position
  14. GRB 120311A: Swift-XRT observations
  15. GRB 120311A: Liverpool Telescope optical candidate
  16. GRB 120311A: Swift detection of a burst
  17. GRB 120308A: 1.23m CAHA I-band observations
  18. GRB 120308A: Swift/UVOT Detection
  19. GRB 120308A: Swift-XRT refined Analysis
  20. GRB 120308A: Enhanced Swift-XRT position
  21. GRB 120308A: Swift-BAT refined analysis
  22. GRB 120308A: PAIRITEL NIR observations
  23. GRB 120308A: confirmation of the optical afterglow
  24. GRB 120308A: Liverpool Telescope optical afterglow candidate
  25. GRB 120308A: Swift detection of a burst
  26. GRB 120305A: D50 optical limits
  27. GRB 120305A: Swift spectral lag analysis
  28. GRB 120302A: Fermi GBM Observation
  29. GRB 120302A: Swift-BAT refined position and a possible XRT and UVOT counterpart
  30. GRB 120305A: Swift/UVOT Upper Limits
  31. GRB 120305A: Swift-XRT refined Analysis
  32. GRB 120305A: Enhanced Swift-XRT position
  33. GRB 120305A: Swift-BAT refined analysis
  34. GRB 120305A - Liverpool Telescope Observations
  35. GRB 120305A: MASTER-NET early optical observations
  36. GRB 120305A: Swift detection of a short burst
  37. GRB 120302A: GROND detection of an afterglow candidate
  38. GRB 120302A, Swift-BAT refined analysis
  39. GRB 111222A: Swift observation on 2012 February 06/07
  40. GRB 120302A found in ground analysis of BAT data
  41. GRB 120229A, Swift-BAT refined analysis
  42. GRB 120229A: Swift detection of a short burst
  43. IPN Triangulation of GRB 120226A
  44. GRB 120226A: Fermi-LAT detection of a burst
  45. GRB 120224A: GROND detection of the afterglow candidate
  46. GRB 120224A: Swift-XRT refined Analysis
  47. Swift Trigger 516027 is CC Eri
  48. GRB 120224A: Swift/UVOT Upper Limits
  49. GRB 120224A: Swift-BAT refined analysis
  50. GRB 120224A: FTN optical observations
  51. GRB 120224A: Enhanced Swift-XRT position
  52. GRB 120224A: Swift detection of a burst
  53. GRB 120219A: MASTER prompt and early optical limit and OT discussion
  54. GRB 120219A: 1.23m CAHA optical observations
  55. GRB 120219A, optical observations
  56. GRB 120219A: Swift-XRT refined Analysis
  57. GRB 120219A: Swift/UVOT Upper Limits
  58. GRB 120219A: Swift-BAT refined analysis
  59. GRB 120219A: Enhanced Swift-XRT position
  60. GRB 120219A: MASTER-NET prompt and early optical observations
  61. GRB 120219A: Swift detection of a burst
  62. GRB 120218A: Swift-BAT refined analysis
  63. GRB 120218A: Swift detection of a burst
  64. GRB 120215A: Swift/UVOT Upper Limits
  65. GRB 120215A: Swift-XRT refined Analysis
  66. GRB 120215A: Enhanced Swift-XRT position
  67. GRB 120215A: Swift-BAT refined analysis
  68. GRB 120215A: Swift detection of a burst
  69. GRB 120213A: Swift-XRT refined Analysis
  70. GRB 120213A: Swift/UVOT Upper Limits
  71. GRB 120212A: Fermi GBM observation
  72. GRB 120213A: Enhanced Swift-XRT position
  73. GRB 120213A: Swift-BAT refined analysis
  74. GRB 120213A: MASTER-NET early optical observations
  75. GRB 120213A: Prompt enhanced Swift-XRT position
  76. GRB 120212A: Swift-XRT refined Analysis
  77. GRB 120213A: Swift detection of a burst
  78. GRB 120212A: Swift/UVOT Detection
  79. GRB 120212A: Swift-BAT refined analysis
  80. GRB 120212A: Enhanced Swift-XRT position
  81. GRB 120212A: Kanata/HOWPol optical observation
  82. GRB 120212A: Swift-XRT observations
  83. GRB 120212A: Swift/UVOT detection
  84. GRB 120211A: GROND Upper limits
  85. GRB 120212A: Swift detection of a burst
  86. GRB 120211A, optical observations
  87. GRB 120211A: Swift-XRT refined Analysis
  88. GRB 120211A: Swift/UVOT Upper Limits
  89. GRB 120211A: MASTER early optical observations
  90. GRB 120211A: Swift-BAT refined analysis
  91. GRB 120211A: Enhanced Swift-XRT position
  92. GRB 120211A - Faulkes Telescope South Observations
  93. GRB 120211A: Swift detection of a burst
  94. LS I +61 303: Swift-BAT refined analysis
  95. GRB 120202A: D50 optical limits
  96. Swift detection of a burst from LS I +61 303
  97. GRB 120202A: GROND observations
  98. GRB 120202A: WHT, Gemini & UKIRT candidate afterglow
  99. GRB 120202A: Swift/XRT and UVOT observations
  100. GRB 111228A: Possible host detected by Swift/UVOT

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