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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"

28199 results found.

  1. GRB 090926A: Swift/UVOT detection of an optical afterglow
  2. GRB 090926A: Skynet/PROMPT Discovery of the Optical Afterglow
  3. GRB090926A: UVOT-enhanced XRT position
  4. GRB 090926B: Swift detection of a burst
  5. GRB 090926: Fermi LAT detection
  6. GRB 090926: Fermi GBM detection
  7. GRB 090925: Fermi GBM detection
  8. GRB090904B : IRSF NIR upper limit
  9. GRB 090922A: Fermi GBM detection
  10. Swift returns to normal operations
  11. GRB 090715B: Skynet/PROMPT Detections
  12. GRB 090726: Skynet/GORT Observations
  13. GRB 090916: Swift-XRT upper limit
  14. GRB 090807: Skynet/DSO Observations
  15. GRB 090915: GROND upper limits
  16. GRB 090915: SARA detection of afterglow candidate
  17. GRB 090912: optical observation
  18. GRB 090915: Swift/UVOT detection of an optical afterglow candidate
  19. GRB 090702: Skynet/GORT Observations
  20. GRB 090902B: Skynet/PROMPT Observations
  21. GRB 090915: Swift-XRT detection of a fading X-ray counterpart
  22. GRB 090916: Swift detection of a short burst
  23. GRB 090915 Swift-BAT detection of a burst in ground analysis
  24. GRB 090827: Confirmation of the X-ray afterglow
  25. GRB 090912: Swift-XRT refined analysis
  26. GRB 090912: Swift/UVOT Upper Limits
  27. GRB 090912 optical upper limit
  28. GRB 090912: Enhanced Swift-XRT position
  29. GRB 090912: Swift detection of a burst
  30. GRB 090910: Fermi GBM detection
  31. GRB 090814A: Skynet/DSO & GORT Observations
  32. GRB 090823: Swift XRT confirmation of the X-ray afterglow
  33. GRB 090904B: GROND detection of the optical afterglow
  34. GRB 090904A: Swift/UVOT Refined Analysis
  35. GRB 090904B: Swift/UVOT Refined Analysis
  36. GRB 090904B: Fermi GBM detection
  37. GRB 090904A: Swift-XRT refined analysis
  38. GRB 090904B: Swift XRT Refined Analysis
  39. GRB 090904B: MOA-II Optical observation
  40. GRB 090904A: Enhanced Swift XRT position
  41. GRB 090902B: VLA radio detection
  42. GRB 090904B: Enhanced Swift-XRT position
  43. GRB090904A: Correction to enhanced XRT position
  44. GRB 090904A: Enhanced Swift-XRT position
  45. GRB 090904A: NOT observations
  46. GRB 090902B: WSRT Radio Observation
  47. GRB090904B: REM observations
  48. GRB 090904B: Swift detection of a burst
  49. GRB 090904A: ROTSE-III Optical Limits
  50. GRB 090904: Swift detection of a burst
  51. GRB 090902B: ROTSE-III Detection of Optical Afterglow
  52. GRB 090902B: Swift/UVOT refined analysis
  53. GRB090902B: Swift XRT refined analysis
  54. GRB 090902B: Faulkes Telescope North observations
  55. GRB 090902B: GROND NIR Afterglow Observations
  56. GRB 090902B: Gemini-N absorption redshift
  57. GRB 090902B: Enhanced Swift-XRT position
  58. GRB 090902B: Optical afterglow candidate
  59. GRB090902B: Swift/UVOT observations
  60. GRB 090902B: Swift/XRT Afterglow Candidate
  61. GRB 090902B: Fermi LAT detection
  62. GRB 090902B: Fermi GBM detection of a bright burst
  63. GRB 090902: Fermi GBM detection
  64. GRB 090831C: GROND upper limits
  65. Swift Trigger 361477, called GRB090831B, is probably not real.
  66. GRB090831C: Swift/UVOT upper limits
  67. GRB 090831C: Swift XRT Refined Analysis
  68. GRB 090829B: Fermi GBM Detection
  69. GRB 090831C: Enhanced Swift-XRT position
  70. GRB 090831C: Swift detection of a burst
  71. GRB 090831: MAXI GSC detection
  72. GRB 090831B: Swift detection of a possible burst
  73. GRB 090831: Fermi GBM detection
  74. GRB090829: Fermi GBM Detection
  75. GRB 090827: Swift XRT and UVOT observations
  76. GRB 090826: Fermi GBM detection
  77. GRB 090828: Fermi GBM detection
  78. GRB 090817 - TLS Observations
  79. GRB 090823: Swift XRT possible detection of the X-ray afterglow
  80. GRB 090823 Long burst with IPN triangulation and BAT position
  81. GRB 090817: Swift/UVOT Observations of a Possible Late-Time Brightening
  82. GRB 090820: detection of a strong burst by RT-2 on board CORONAS PHOTON
  83. GRB 090820B: Fermi GBM detection
  84. GRB 090817: Swift/UVOT Observations of a Host Galaxy Candidate
  85. GRB 090820: Fermi GBM Detection of a bright burst.
  86. GRB 090817: aphotometry of USNO-B1.0 341-0096763
  87. GRB 090817: Liverpool Telescope Observations
  88. GRB 090817: optical upper limit
  89. GRB 090817: Confirmation of the X-ray afterglow
  90. GRB 090815C: Swift refined analysis
  91. GRB 090817: Swift/UVOT Upper Limits
  92. GRB 090813: I-band observations from 1.5m OSN telescope
  93. GRB 090817: Swift-XRT observations
  94. GRB 090814A: optical observations
  95. VLA radio non-detection of GRB 090812
  96. GRB 090815B: Fermi GBM detection
  97. GRB 090815: Fermi GBM detection
  98. GRB 090813: CrAO optical obsevations
  99. GRB 090814B: Confirmation of the X-ray afterglow
  100. GRB090814A: NOT optical follow-ups

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