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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"

43889 results found.

  1. GRB 141011A: Fermi GBM detection
  2. Trigger 614903: Swift detection of IGR J17544-2619
  3. GRB 141005A: iTelescope.Net T21 Optical Observation
  4. GRB141004A: Host galaxy redshift form GTC
  5. GRB 141005A: Additional P60 imaging and afterglow confirmation
  6. GRB 141004A: Fermi GBM observation
  7. GRB 141004A: GROND observations
  8. GRB 141005A: GROND observations
  9. Konus-Wind observation of GRB 141005A
  10. GRB 141004A: Swift-XRT refined Analysis
  11. GRB 141005A: Swift-XRT refined Analysis
  12. GRB 141005A: Swift/UVOT Upper Limits
  13. GRB 141005A: Swift-BAT refined analysis
  14. GRB 141004A: Swift-BAT refined analysis
  15. GRB141004A: NOT imaging and spectroscopy
  16. GRB 141004A: Swift/UVOT Detection
  17. GRB 141005A: Fermi GBM Detection
  18. GRB 141005A: Enhanced Swift-XRT position
  19. GRB 141004A: RATIR Optical Observations
  20. GRB 141004A: Monte Agliale Observatory optical observations
  21. GRB 141005A: RATIR Optical Observations
  22. GRB 141005A: P60 probable afterglow deteaction
  23. GRB 141004A: Enhanced Swift-XRT position
  24. GRB 141005A: Swift detection of a burst
  25. GRB 141004A: TNG photometric and spectroscopic observations
  26. GRB 141004A: 1.23m CAHA optical observations
  27. GRB 141004A: a long GRB detected by INTEGRAL
  28. GRB 141004A: Swift detection of a burst with an optical counterpart
  29. Swift observations of HD 305560
  30. GRB 140928A: Swift-XRT follow-up observations
  31. GRB 140930B: MASTER early possible OT detection
  32. Swift possible detection of the Be star HD 305560
  33. GRB 140930B: Gemini South Spectroscopy
  34. GRB 140930B: GROND observations
  35. GRB 140930A/MAXI J2259+524: MASTER optical observations
  36. GRB 140930B Swift-BAT refined analysis
  37. GRB 140930B: Swift/UVOT Upper Limits
  38. Konus-Wind observation of GRB 140930B
  39. GRB 140930B: Keck NIR imaging
  40. GRB 140930B: Swift-XRT refined Analysis
  41. GRB 140930B: Enhanced Swift-XRT position
  42. GRB 140928A: MAXI-GSC detection
  43. GRB 140930B: MMT confirmation of the optical afterglow
  44. GRB 140930B: ISON-Kislovodsk observations
  45. GRB 140930B: WHT detection of candidate afterglow
  46. GRB 140930B: 1.23m CAHA optical observations
  47. GRB 140930B: Prompt enhanced Swift-XRT position
  48. GRB 140930B: MASTER early optical observations
  49. GRB 140930B: Swift detection of a short burst
  50. GRB140928A: Gemini-South observation
  51. GRB 140930A/MAXI J2259+524: MAXI-GSC detection
  52. Konus-Wind observation of GRB 140928A
  53. GRB 140928A: LCO-Cerro Tololo further observations
  54. IPN Triangulation of GRB 140928A
  55. GRB 140928A: LCO-Cerro Tololo observations
  56. GRB 140928A: Fermi GBM detection
  57. GRB 140928A: GROND Afterglow Candidate
  58. GRB 140928A: Swift-XRT observations
  59. GRB 140928A: Fermi-LAT detection
  60. GRB 140927A: Swift-UVOT analysis
  61. GRB 140927A: Swift-BAT refined analysis
  62. GRB 140927A: Swift-XRT refined Analysis
  63. GRB 140927A: Enhanced Swift-XRT position
  64. GRB 140927A: Swift detection of a burst
  65. Swift Trigger 613581 is not an astrophysical event
  66. Swift Trigger 613516 is not an astrophysical event
  67. GRB 140919A, Swift-BAT refined analysis
  68. GRB 140919A: Swift-XRT refined Analysis
  69. GRB 140919A: Swift/UVOT Detection
  70. GRB 140919A: GROND afterglow candidate
  71. GRB 140919A: Fermi GBM observation
  72. GRB 140919A: Enhanced Swift-XRT position
  73. GRB 140919A: Swift/UVOT observations
  74. GRB 140919A: Swift-XRT observations
  75. GRB 140919A: Swift detection of a burst
  76. GRB 140916B: LOT and iPTF follow-up of optical afterglow candidates
  77. Swift detection of outburst from 4U 1700+24
  78. GRB 140916A: Swift-BAT refined analysis
  79. GRB 140916A: UKIRT J-band observations
  80. GRB 140916A: Swift-XRT refined Analysis
  81. GRB 140916A: Enhanced Swift-XRT position
  82. GRB 140916B: iPTF Optical Observations
  83. GRB 140916A: FTS observations
  84. GRB 140916A: Prompt enhanced Swift-XRT position
  85. GRB 140916A: Swift detection of a burst
  86. GRB 140907A: Continued DCT Observations
  87. Fermi GBM trigger 140913075 is not a GRB
  88. GRB 140909A: Confirmation of the Swift-XRT afterglow
  89. Possible radio detection of GRB 140903A with the GMRT
  90. GRB 140907A: Mondy optical observations
  91. GRB 140903A: Chandra detection of the afterglow
  92. GRB 140909A: Swift-XRT observations
  93. GRB 140907A: 1.23m CAHA optical observations
  94. GRB 140907A: TShAO observations
  95. GRB 140909A: Swift detection of a GRB
  96. Konus-Wind observation of GRB 140906C
  97. GRB 140907A: MASTER optical observations
  98. Refined IPN Triangulation of GRB 140906C
  99. GRB 140907A: Nishi-Harima NIR Observations
  100. GRB 140907A: Discovery Channel Telescope observations

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