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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"

19681 results found.

  1. GRB 141220A: Swift/UVOT Detection
  2. GRB141220A: 1.23m CAHA I-band observations
  3. GRB 141220A: Swift detection of a burst with an optical afterglow
  4. IPN Triangulation of GRB 141215A (long/intense)
  5. GRB 141212A iTelescope observation
  6. GRB 141212A: Zadko observatory - Gingin optical observations
  7. GRB 141212B: MITSuME Akeno upper limits
  8. GRB 141212A: Swift/UVOT Upper Limits
  9. GRB 141212B: Swift/UVOT Upper Limits
  10. GRB 141212A: VLA upper limit
  11. GRB 141212A: Gemini-N spectroscopy and photometry
  12. GRB 141212B: Enhanced Swift-XRT position
  13. Swift detection of 4U 1700+24 (= V934 Her)
  14. GRB 141212A: MITSuME Okayama upper limits
  15. GRB 141212A: extended object within the XRT error circle
  16. GRB 141212A: Khureltogot optical upper limit
  17. GRB 141212A: 1.23m CAHA I-band observations
  18. GRB 141212B: initial Swift/UVOT observations
  19. GRB 141212A: Enhanced Swift-XRT position
  20. GRB 141212A: Skynet R-COP Observations
  21. GRB 141212A: MITSuME Akeno upper limits
  22. GRB 141212B: Swift detection of a burst
  23. GRB 141212A: Swift detection of a short burst
  24. GRB 141207A: Swift-XRT afterglow candidate detection
  25. GRB141202A: Discovery Channel Telescope Optical Observations
  26. GRB141207A: Discovery Channel Telescope Optical Observations
  27. GRB 141207A: Swift-XRT observations
  28. GRB141121A: Discovery Channel Telescope Optical Observations
  29. GRB 141205A: Swift/UVOT Upper Limits
  30. GRB 141205A: Nanshan optical upper limit
  31. GRB 141121A: Mondy optical observations
  32. GRB 141130A: Mondy optical observations
  33. GRB 141030A: Nanshan very early optical observations
  34. GRB 141121A: Continued RATIR Optical Observations
  35. GRB 141130A: Swift/UVOT Detection
  36. GRB 141130A: Enhanced Swift-XRT position
  37. GRB 141130A: Nanshan optical observations
  38. GRB 141130A: Mondy optical observations
  39. GRB 141130A: Swift detection of a burst with an optical counterpart
  40. GRB 141121A: Continued RATIR Optical Observations
  41. GRB 141121A: Mondy optical observations
  42. GRB 141121A: TSHAO optical observations
  43. GRB 141121A: Continued RATIR Optical Observations
  44. GRB 141121A: MITSuME Ishigakijima Optical Observation after 7 days
  45. GRB 141121A: Khureltogot optical observations
  46. GRB 141121A: Mondy optical observations
  47. GRB 141121A: RATIR Optical and NIR Observations
  48. IPN Triangulation of GRB 141125A (short/hard)
  49. GRB 141121A: three epochs of SAO RAS optical observations
  50. GRB 141121A: Continued RATIR Optical Observations
  51. GRB 141121A: TSHAO optical observations
  52. GRB 141121A: Continued Mondy optical observations
  53. GRB 141121A: Continued RATIR Optical Observations
  54. GRB 141121A: RATIR Optical Observations - Steeper Fading
  55. GRB 141121A: MITSuME Ishigakijima Optical Observation after 3 days
  56. GRB 141121A: RATIR Optical Observations - Fading Again
  57. GRB141124A: MASTER Detection of New Flare of QSO NVSS J075043+790917 During the Fermi Error Box inspection
  58. GRB 141121A: Mondy optical observations
  59. GRB 141121A: MITSuME Ishigakijima Optical Observation
  60. GRB 141121A: Continued RATIR Optical Observations - Rebrightening
  61. GRB 141121A: AAO optical observations
  62. GRB 141121A: MITSuME Akeno Optical observation
  63. GRB 141121A: Continued RATIR Optical Observations
  64. GRB 141121A: Swift/UVOT Detections
  65. GRB 141121A: RATIR Optical Observations
  66. GRB 141121A: Enhanced Swift-XRT position
  67. GRB 141118A: iPTF Optical Observations
  68. GRB 141121A: GROND Afterglow candidate
  69. GRB 141121A: Swift detection of a burst
  70. IPN Triangulation of GRB 141118A
  71. GRB 141104A: further Swift-XRT observations and afterglow candidate
  72. Swift Trigger 618673: probable noise event
  73. Trigger 618634: Swift detection of Vela X-1
  74. GRB 141109B: optical upper limits
  75. GRB 141015A: TAROT La Silla observatory optical observations
  76. GRB 141022A: TAROT La Silla observatory optical observations
  77. GRB 141031A: TAROT La Silla observatory optical observations
  78. GRB 141109A: TAROT La Silla observatory optical observations
  79. GRB 141109A: AAO optical observations
  80. Swift Trigger 618402: probable noise event
  81. GRB 141109A: Terskol photometry
  82. GRB 141109B: Swift/UVOT Upper Limits
  83. GRB 141109A: Swift/UVOT Detection
  84. GRB 141109A: NOT r-band observation
  85. GRB 141109B: MITSuME Akeno upper limits
  86. GRB 141109A: MITSuME Ishigakijima upper limits
  87. GRB 141109A: Swift-XRT refined Analysis
  88. GRB 141109B: Enhanced Swift-XRT position
  89. GRB 141109A: Enhanced Swift-XRT position
  90. GRB 141109A: CQUEAN Detection at 0.85 - 1.05 micron
  91. GRB 141109A: GROND afterglow observation
  92. GRB 141109A: REM NIR candidate afterglow
  93. GRB 141109B: Swift detection of a burst
  94. GRB 141109A: Swift detection of a burst
  95. GRB 141028A: Mondy optical observations
  96. GRB 141026A: CrAO optical observation
  97. GRB
  98. GRB 141026A: Gemini-North optical and NIR imaging
  99. GRB 141028A: TShAO optical observation
  100. GRB 141031B: TShAO optical observations

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