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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"

19664 results found.

  1. GRB 141212B: Swift/UVOT Upper Limits
  2. GRB 141212B: Swift-BAT refined analysis
  3. GRB 141212A: Swift-BAT refined analysis
  4. GRB 141212B: Enhanced Swift-XRT position
  5. Swift detection of 4U 1700+24 (= V934 Her)
  6. GRB 141212A: Swift-XRT refined Analysis
  7. GRB 141212A: Khureltogot optical upper limit
  8. GRB 141212B: initial Swift/UVOT observations
  9. GRB 141212B: Swift/XRT preliminary localization
  10. GRB 141212A: Enhanced Swift-XRT position
  11. GRB 141212A: MASTER early optical observations
  12. GRB 141212A: Skynet R-COP Observations
  13. GRB 141212B: Swift detection of a burst
  14. GRB 141212A: Swift detection of a short burst
  15. GRB 141207A: Swift-XRT afterglow candidate detection
  16. GRB 141207A: Swift-UVOT Observations
  17. GRB 141207A: Fermi GBM detection
  18. GRB 141207A: Swift-XRT observations
  19. Konus-Wind observation of GRB 141130A
  20. GRB 141207A Tiled Swift observations
  21. GRB 141207A: Fermi-LAT Detection
  22. GRB141121A: Discovery Channel Telescope Optical Observations
  23. GRB 141205A: Swift/UVOT Upper Limits
  24. GRB 141205A: Fermi GBM detection
  25. GRB 141205A: XRT observations
  26. GRB 141205A Swift-BAT refined analysis
  27. GRB 141202A: Swift/UVOT Detection of a Variable Source Near the IPN Error Box
  28. GRB 141205A Short hard GRB found in ground analysis of BAT data
  29. GRB 141202A: Swift XRT observations
  30. GRB 141202A Tiled Swift observations
  31. IPN Triangulation of GRB 141202A (short/hard)
  32. GRB 141121A: Continued RATIR Optical Observations
  33. GRB 141130A: Swift-BAT refined analysis
  34. GRB 141130A: Swift/UVOT Detection
  35. GRB 141130A: Swift-XRT refined Analysis
  36. GRB 141130A: Enhanced Swift-XRT position
  37. GRB 141130A: Swift detection of a burst with an optical counterpart
  38. GRB 141121A: Continued RATIR Optical Observations
  39. GRB 141121A: Continued RATIR Optical Observations
  40. IPN Triangulation of GRB 141121A (initial episode)
  41. GRB 141121A: SPI-ACS/INTEGRAL observations
  42. GRB 141121A: RATIR Optical and NIR Observations
  43. Konus-Wind observation of GRB 141121A
  44. IPN Triangulation of GRB 141125A (short/hard)
  45. GRB 141121A: Continued RATIR Optical Observations
  46. GRB 141121A: Continued RATIR Optical Observations
  47. GRB 141121A: RATIR Optical Observations - Steeper Fading
  48. GRB 141121A: RATIR Optical Observations - Fading Again
  49. GRB 141121A: LCO-FTN rebrightening confirmation
  50. GRB 141121A: Continued RATIR Optical Observations - Rebrightening
  51. GRB 141121A: Continued RATIR Optical Observations
  52. GRB 141121A: Swift-XRT refined Analysis
  53. GRB 141121A: Swift/UVOT Detections
  54. GRB 141121A: RATIR Optical Observations
  55. GRB 141121A: Swift-BAT refined analysis
  56. GRB 141121A: LCO-FTN observations
  57. GRB 141121A: Enhanced Swift-XRT position
  58. GRB 141121A: GROND Afterglow candidate
  59. GRB141121A: BOOTES-2/TELMA upper limit
  60. GRB 141121A: Swift detection of a burst
  61. IPN Triangulation of GRB 141118A
  62. GRB 141104A: further Swift-XRT observations and afterglow candidate
  63. Swift Trigger 618673: probable noise event
  64. Trigger 618634: Swift detection of Vela X-1
  65. GRB 141109B: optical upper limits
  66. GRB 141015A: TAROT La Silla observatory optical observations
  67. GRB 141022A: TAROT La Silla observatory optical observations
  68. GRB 141031A: TAROT La Silla observatory optical observations
  69. GRB 141109A: TAROT La Silla observatory optical observations
  70. GRB 141109A: AAO optical observations
  71. Swift Trigger 618402: probable noise event
  72. Swift Trigger 618391 is not an astrophysical event
  73. GRB 141109B: Swift/UVOT Upper Limits
  74. GRB 141109A: Swift/UVOT Detection
  75. Konus-Wind observation of GRB 141109A
  76. GRB 141109B: IRAM 30m millimetre observations
  77. GRB 141109B: Swift-XRT refined Analysis
  78. Swift Trigger 618134 is not an astrophysical event
  79. GRB 141109A: Swift-XRT refined Analysis
  80. GRB 141109B: BOOTES-4 and TERSKOL optical upper limit
  81. GRB 141109B: Swift-BAT refined analysis
  82. GRB 141109B: Enhanced Swift-XRT position
  83. GRB 141109A: Swift-BAT refined analysis
  84. GRB 141109A: Enhanced Swift-XRT position
  85. GRB 141109A: GROND afterglow observation
  86. X-shooter redshift of GRB 141109A
  87. GRB 141109B: Swift detection of a burst
  88. GRB 141109A: Swift detection of a burst
  89. GRB 141104A: Swift-XRT observations
  90. GRB 141104A Tiled Swift observations
  91. GRB 141026A: CrAO optical observation
  92. GRB
  93. GRB 141017A: Skynet PROMPT-CTIO/SSO Observations
  94. IPN Triangulation of GRB 141104A (long/very bright)
  95. GRB 141102A possible precursor was another, known source
  96. Konus-Wind observation of GRB 141102A
  97. GRB 141022A: Skynet PROMPT-CTIO Observations
  98. GRB 141102A: Fermi-LAT detection
  99. GRB 141102A: Fermi GBM detection
  100. GRB 141102A found in ground analysis of BAT data

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