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GCN Circulars

GCN Circulars are rapid astronomical bulletins submitted by and distributed to community members worldwide. They are used to share discoveries, observations, quantitative near-term predictions, requests for follow-up observations, or future observing plans related to high-energy, multi-messenger, and variable or transient astrophysical events. 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"

28035 results found.

  1. GRB 080727C: TAROT Calern observatory optical observations
  2. GRB 080727B: KAIT photometry and an early lightcurve break
  3. GRB 080727C, Swift-BAT refined analysis
  4. GRB 080727C: Swift/UVOT Upper Limits
  5. GRB 080727C: Swift XRT refined analysis
  6. GRB 080727C: Liverpool Telescope observations
  7. GRB 080727A: VLT upper limits
  8. GRB 080727C: Enhanced Swift-XRT position
  9. GRB080727C: RTT150 optical observations
  10. GRB 080727C: Swift detection of a burst
  11. Swift detection of XTE J1701-407
  12. GRB 080727B: Swift/UVOT Upper Limits
  13. BAT Trigger 318150 is not a GRB
  14. GRB 080727B: Swift-XRT refined analysis
  15. GRB 080727B, Swift-BAT refined analysis
  16. GRB 080727A, Swift-BAT refined analysis
  17. GRB 080727A: Swift-XRT refined analysis
  18. GRB080727A: Swift/UVOT Upper Limits
  19. GRB 080727B: Enhanced Swift-XRT position
  20. GRB 080727A: Enhanced Swift-XRT position
  21. GRB 080727B: REM prompt observations
  22. GRB 080727B: Swift detection of a bright burst
  23. GRB 080727: Swift detection of a burst
  24. GRB 080726: GRB Localization by SuperAGILE
  25. GRB 080725, Swift-BAT refined analysis
  26. GRB 080723A: optical upper limit
  27. GRB080723B: Swift/UVOT Upper Limits
  28. GRB 080725: REM prompt observations
  29. GRB 080723A: Swift/UVOT Upper Limits
  30. VLA radio upper limit on GRB 080721
  31. GRB 080723B - correction to flux conversion factor
  32. GRB 080723B - Swift-XRT refined analysis
  33. GRB 080723, Swift-BAT refined analysis
  34. GRB 080723B: AGILE GRID and MCAL results
  35. GRB 080723A: Swift-XRT refined analysis
  36. GRB 080723B: Detection and Localization by SuperAGILE
  37. GRB 080723: Enhanced Swift-XRT position
  38. GRB 080723: Swift detection of a burst
  39. GRB 080721 : Lulin 2nd optical follow-ups
  40. GRB 080721: Swift-XRT refined analysis
  41. GRB 080721: Enhanced Swift-XRT position
  42. GRB 080721, Swift-BAT refined analysis
  43. GRB 080721 : Lulin Optical follow-ups
  44. GRB 080721: Swift detection of a burst with a bright optical counterpart.
  45. Trigger 317393: Swift detection of a possible GRB
  46. Trigger 317205: Swift detection of an outburst from XTE J1701-407
  47. GRB 080714: GROND confirmation of the optical/NIR afterglow
  48. Konus-Wind observation of GRB 080714
  49. GRB 080714: Swift/UVOT Detection of an Optical Afterglow
  50. GRB 080714: Enhanced Swift-XRT position
  51. GRB 080714: Swift-BAT refined analysis
  52. GRB 080714: Swift detection of a burst
  53. GRB 080702A: optical upper limit
  54. GRB 080603A: CrAO optical observations
  55. GRB 080702B: Swift XRT confirmation of the afterglow
  56. GRB 080710: Lick IR detection
  57. GRB 080710, Swift-BAT refined analysis
  58. GRB 0800707: optical observations
  59. GRB 080710: Swift-XRT refined analysis
  60. GRB080710: Swift/UVOT observations
  61. GRB 080710: Enhanced Swift-XRT position
  62. UVOT white band observations of GRB080710
  63. GRB 080710: REM afterglow confirmation & brightening
  64. GRB 080710: Swift XRT position
  65. New Swift-XRT GRB products available online.
  66. GRB 080707: GROND Confirmation of the Optical Afterglow
  67. UVOT observations of GRB080707
  68. GRB 080707, Swift-BAT refined analysis
  69. GRB 080707: Swift XRT refined analysis
  70. GRB 080707: Enhanced Swift-XRT position
  71. GRB 080707: VLT redshift
  72. GRB 080707: GROND Detection of the Optical Afterglow Candidate
  73. GRB 080707: Swift detection of a burst
  74. Refined analysis of Swift Trigger 316063, is IGR J08408-4503
  75. Trigger 316063: Swift detection of a transient
  76. GRB 080703: GROND Upper Limits
  77. GRB 080702B: GROND Upper Limits
  78. GRB 080703: UVOT Follow-Up Observation
  79. GRB 080703: VLT observations of the afterglow
  80. GRB 080703: Enhanced Swift-XRT position
  81. GRB 080703, Swift-BAT refined analysis
  82. GRB 080702B Swift-BAT refined analysis
  83. GRB 080703: Swift detection of a burst with optical afterglow
  84. GRB 080703A: ROTSE-III Detection of Optical Counterpart
  85. No radio detection from the short GRB 080702A
  86. Swift/UVOT observation of GRB080702A
  87. GRB 080702B: Swift XRT and UVOT observations
  88. GRB 080625: Suzaku WAM observation of the prompt emission
  89. GRB 080701A: Early RAPTOR optical limits
  90. Swift Trigger 315630: Swift/UVOT Upper Limits
  91. GRB 080702A, Swift-BAT refined analysis
  92. GRB 080702A: Swift-XRT Team refined analysis
  93. GRB 080702B : Burst detected in BAT during Swift slew
  94. GRB 080702A: Enhanced Swift-XRT position
  95. Swift Trigger 315630: TLS R-band observation
  96. Swift Trigger 315630: Probably not a GRB
  97. GRB 080702: Swift detection of a short burst
  98. GRB 080701A, VATT optical upper limit
  99. TLS I-Band Observation of GRB 080701A
  100. GRB 080701A: Swift/UVOT Upper Limits

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