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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"

27113 results found.

  1. GRB141221A: GROND Afterglow Detection
  2. GRB 141221A: Skynet PROMPT-CTIO observations of the optical afterglow
  3. GRB 141221A: LCOGT-McDonald optical afterglow observations
  4. Konus-Wind observation of GRB 141220A
  5. GRB 141221A: Swift detection of a burst with an optical counterpart
  6. GRB 141220A: Fermi GBM observation
  7. GRB 141220A: Swift-XRT refined Analysis
  8. GRB 141220A: Swift-BAT refined analysis
  9. GRB 141220A: Swift/UVOT Detection
  10. GRB 141220A: LT optical afterglow observations
  11. GRB 141220A: Swift detection of a burst with an optical afterglow
  12. Fermi Gamma-ray Burst Monitor trigger 440728127 / 141220020 is not a GRB
  13. GRB 141207A: Suzaku WAM observation of the prompt emission
  14. GRB 141202A: Suzaku WAM observation of the prompt emission
  15. GRB 141215A: Swift-XRT observations
  16. GRB 141215A: Fermi GBM detection
  17. IPN Triangulation of GRB 141215A (long/intense)
  18. GRB 141212A iTelescope observation
  19. GRB 141212A: Zadko observatory - Gingin optical observations
  20. Konus-Wind observation of GRB 141212B
  21. GRB 141212B: Swift-XRT refined Analysis
  22. GRB 141212A: Swift/UVOT Upper Limits
  23. GRB 141212B: Swift/UVOT Upper Limits
  24. GRB 141212A: Gemini-N spectroscopy and photometry
  25. GRB 141212B: Swift-BAT refined analysis
  26. GRB 141212A: Swift-BAT refined analysis
  27. Swift detection of 4U 1700+24 (= V934 Her)
  28. GRB 141212A: Swift-XRT refined Analysis
  29. GRB 141212B: initial Swift/UVOT observations
  30. GRB 141212B: Swift/XRT preliminary localization
  31. GRB 141212A: MASTER early optical observations
  32. GRB 141212A: Skynet R-COP Observations
  33. GRB 141212B: Swift detection of a burst
  34. GRB 141212A: Swift detection of a short burst
  35. GRB141208.63: MASTER OT Detection During the Fermi Error Box inspection
  36. GRB141207A: Discovery Channel Telescope Optical Observations
  37. GRB 141207A: Fermi GBM detection
  38. Konus-Wind observation of GRB 141130A
  39. GRB 141207A: Fermi-LAT Detection
  40. GRB141121A: Discovery Channel Telescope Optical Observations
  41. GRB 141205A: Swift/UVOT Upper Limits
  42. GRB 141205A: Fermi GBM detection
  43. GRB 141202A: Swift/UVOT Detection of a Variable Source Near the IPN Error Box
  44. GRB 141205A Short hard GRB found in ground analysis of BAT data
  45. GRB 141202A: Swift XRT observations
  46. GRB 141202A: Fermi GBM Detection
  47. IPN Triangulation of GRB 141202A (short/hard)
  48. GRB 141121A: Continued RATIR Optical Observations
  49. GRB 141130A: Swift-BAT refined analysis
  50. GRB 141130A: Swift/UVOT Detection
  51. GRB 141130A: Swift-XRT refined Analysis
  52. GRB 141130A: Mondy optical observations
  53. GRB 141130A: Swift detection of a burst with an optical counterpart
  54. GRB 141121A: Continued RATIR Optical Observations
  55. GRB 141121A: Continued RATIR Optical Observations
  56. GRB 141121A: SPI-ACS/INTEGRAL observations
  57. GRB 141121A: RATIR Optical and NIR Observations
  58. Konus-Wind observation of GRB 141121A
  59. GRB 141121A: Continued RATIR Optical Observations
  60. GRB 141121A: Continued Mondy optical observations
  61. GRB 141121A: Continued RATIR Optical Observations
  62. GRB 141121A: RATIR Optical Observations - Steeper Fading
  63. GRB 141124A​: iPTF upper limits​
  64. GRB 141121A: RATIR Optical Observations - Fading Again
  65. GRB141124A: MASTER Detection of New Flare of QSO NVSS J075043+790917 During the Fermi Error Box inspection
  66. GRB 141118A: Fermi GBM Detection
  67. GRB 141121A: LCO-FTN rebrightening confirmation
  68. GRB 141121A: Continued RATIR Optical Observations - Rebrightening
  69. GRB 141121A: Continued RATIR Optical Observations
  70. GRB 141121A: Swift-XRT refined Analysis
  71. GRB 141121A: Swift/UVOT Detections
  72. GRB 141121A: RATIR Optical Observations
  73. GRB 141121A: Swift-BAT refined analysis
  74. GRB 141121A: LCO-FTN observations
  75. GRB 141118A: iPTF Optical Observations
  76. GRB 141121A: GROND Afterglow candidate
  77. GRB 141121A: MAXI/GSC detection
  78. GRB 141121A: Swift detection of a burst
  79. GRB 141109A: further VLA observations
  80. GRB 141104A: further Swift-XRT observations and afterglow candidate
  81. Swift Trigger 618673: probable noise event
  82. Trigger 618634: Swift detection of Vela X-1
  83. GRB 141015A: TAROT La Silla observatory optical observations
  84. GRB 141022A: TAROT La Silla observatory optical observations
  85. GRB 141031A: TAROT La Silla observatory optical observations
  86. GRB 141109A: TAROT La Silla observatory optical observations
  87. Swift Trigger 618402: probable noise event
  88. Swift Trigger 618391 is not an astrophysical event
  89. GRB 141109A: Terskol photometry
  90. GRB 141109B: Swift/UVOT Upper Limits
  91. GRB 141109A: Swift/UVOT Detection
  92. Konus-Wind observation of GRB 141109A
  93. GRB 141109B: Swift-XRT refined Analysis
  94. Swift Trigger 618134 is not an astrophysical event
  95. GRB 141109A: Swift-XRT refined Analysis
  96. GRB 141109B: Swift-BAT refined analysis
  97. GRB 141109A: Swift-BAT refined analysis
  98. GRB 141109A: GROND afterglow observation
  99. GRB 141109B: Swift detection of a burst
  100. GRB 141109A: Swift detection of a burst

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