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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"

43879 results found.

  1. GRB 141005A: Swift-XRT refined Analysis
  2. GRB 141005A: Swift/UVOT Upper Limits
  3. GRB 141005A: Swift-BAT refined analysis
  4. GRB 141004A: Swift-BAT refined analysis
  5. GRB141004A: NOT imaging and spectroscopy
  6. GRB 141004A: Swift/UVOT Detection
  7. GRB 141005A: Fermi GBM Detection
  8. GRB 141005A: Enhanced Swift-XRT position
  9. GRB 141004A: RATIR Optical Observations
  10. GRB 141004A: Monte Agliale Observatory optical observations
  11. GRB 141005A: RATIR Optical Observations
  12. GRB 141005A: P60 probable afterglow deteaction
  13. GRB 141004A: Enhanced Swift-XRT position
  14. GRB 141005A: Swift detection of a burst
  15. GRB 141004A: TNG photometric and spectroscopic observations
  16. GRB 141004A: 1.23m CAHA optical observations
  17. GRB 141004A: a long GRB detected by INTEGRAL
  18. GRB 141004A: Swift detection of a burst with an optical counterpart
  19. Swift observations of HD 305560
  20. GRB 140928A: Swift-XRT follow-up observations
  21. GRB 140930B: MASTER early possible OT detection
  22. Swift possible detection of the Be star HD 305560
  23. GRB 140930B: Gemini South Spectroscopy
  24. GRB 140930B: GROND observations
  25. GRB 140930A/MAXI J2259+524: MASTER optical observations
  26. GRB 140930B Swift-BAT refined analysis
  27. GRB 140930B: Swift/UVOT Upper Limits
  28. Konus-Wind observation of GRB 140930B
  29. GRB 140930B: Keck NIR imaging
  30. GRB 140930B: Swift-XRT refined Analysis
  31. GRB 140930B: Enhanced Swift-XRT position
  32. GRB 140928A: MAXI-GSC detection
  33. GRB 140930B: MMT confirmation of the optical afterglow
  34. GRB 140930B: ISON-Kislovodsk observations
  35. GRB 140930B: WHT detection of candidate afterglow
  36. GRB 140930B: 1.23m CAHA optical observations
  37. GRB 140930B: Prompt enhanced Swift-XRT position
  38. GRB 140930B: MASTER early optical observations
  39. GRB 140930B: Swift detection of a short burst
  40. GRB140928A: Gemini-South observation
  41. GRB 140930A/MAXI J2259+524: MAXI-GSC detection
  42. Konus-Wind observation of GRB 140928A
  43. GRB 140928A: LCO-Cerro Tololo further observations
  44. IPN Triangulation of GRB 140928A
  45. GRB 140928A: LCO-Cerro Tololo observations
  46. GRB 140928A: Fermi GBM detection
  47. GRB 140928A: GROND Afterglow Candidate
  48. GRB 140928A: Swift-XRT observations
  49. GRB 140928A: Fermi-LAT detection
  50. GRB 140927A: Swift-UVOT analysis
  51. GRB 140927A: Swift-BAT refined analysis
  52. GRB 140927A: Swift-XRT refined Analysis
  53. GRB 140927A: Enhanced Swift-XRT position
  54. GRB 140927A: Swift detection of a burst
  55. Swift Trigger 613581 is not an astrophysical event
  56. Swift Trigger 613516 is not an astrophysical event
  57. GRB 140919A, Swift-BAT refined analysis
  58. GRB 140919A: Swift-XRT refined Analysis
  59. GRB 140919A: Swift/UVOT Detection
  60. GRB 140919A: GROND afterglow candidate
  61. GRB 140919A: Fermi GBM observation
  62. GRB 140919A: Enhanced Swift-XRT position
  63. GRB 140919A: Swift/UVOT observations
  64. GRB 140919A: Swift-XRT observations
  65. GRB 140919A: Swift detection of a burst
  66. GRB 140916B: LOT and iPTF follow-up of optical afterglow candidates
  67. Swift detection of outburst from 4U 1700+24
  68. GRB 140916A: Swift-BAT refined analysis
  69. GRB 140916A: UKIRT J-band observations
  70. GRB 140916A: Swift-XRT refined Analysis
  71. GRB 140916A: Enhanced Swift-XRT position
  72. GRB 140916B: iPTF Optical Observations
  73. GRB 140916A: FTS observations
  74. GRB 140916A: Prompt enhanced Swift-XRT position
  75. GRB 140916A: Swift detection of a burst
  76. GRB 140907A: Continued DCT Observations
  77. Fermi GBM trigger 140913075 is not a GRB
  78. GRB 140909A: Confirmation of the Swift-XRT afterglow
  79. Possible radio detection of GRB 140903A with the GMRT
  80. GRB 140907A: Mondy optical observations
  81. GRB 140903A: Chandra detection of the afterglow
  82. GRB 140909A: Swift-XRT observations
  83. GRB 140907A: 1.23m CAHA optical observations
  84. GRB 140907A: TShAO observations
  85. GRB 140909A: Swift detection of a GRB
  86. Konus-Wind observation of GRB 140906C
  87. GRB 140907A: MASTER optical observations
  88. Refined IPN Triangulation of GRB 140906C
  89. GRB 140907A: Nishi-Harima NIR Observations
  90. GRB 140907A: Discovery Channel Telescope observations
  91. IPN Triangulation of GRB 140906C (short/hard)
  92. GRB 140907A: T100 observations
  93. GRB 140907A: Swift-BAT refined analysis
  94. GRB 140907A: Fermi GBM Detection
  95. GRB 140907A: redshift from the 10.4m GTC telescope
  96. GRB 140907A: Swift-XRT refined Analysis
  97. GRB 140907A: Enhanced Swift-XRT position
  98. GRB 140907A : Virtual Telescope optical observations
  99. GRB140907A: Swift UVOT detection
  100. GRB 140906B: Fermi GBM Detection of a Long GRB

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