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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"

27401 results found.

  1. GRB 080723A: Swift-XRT refined analysis
  2. GRB 080723B: Detection and Localization by SuperAGILE
  3. GRB 080723: Enhanced Swift-XRT position
  4. GRB 080723: Swift detection of a burst
  5. GRB 080721 : Lulin 2nd optical follow-ups
  6. GRB 080721: Swift-XRT refined analysis
  7. GRB 080721: Enhanced Swift-XRT position
  8. GRB 080721, Swift-BAT refined analysis
  9. GRB 080721 : Lulin Optical follow-ups
  10. GRB 080721: Swift detection of a burst with a bright optical counterpart.
  11. Trigger 317393: Swift detection of a possible GRB
  12. Trigger 317205: Swift detection of an outburst from XTE J1701-407
  13. GRB 080714: GROND confirmation of the optical/NIR afterglow
  14. Konus-Wind observation of GRB 080714
  15. GRB 080714: Swift/UVOT Detection of an Optical Afterglow
  16. GRB 080714: Enhanced Swift-XRT position
  17. GRB 080714: Swift-BAT refined analysis
  18. GRB 080714: Swift detection of a burst
  19. GRB 080702A: optical upper limit
  20. GRB 080603A: CrAO optical observations
  21. GRB 080702B: Swift XRT confirmation of the afterglow
  22. GRB 080710: Lick IR detection
  23. GRB 080710, Swift-BAT refined analysis
  24. GRB 0800707: optical observations
  25. GRB 080710: Swift-XRT refined analysis
  26. GRB080710: Swift/UVOT observations
  27. GRB 080710: Enhanced Swift-XRT position
  28. UVOT white band observations of GRB080710
  29. GRB 080710: REM afterglow confirmation & brightening
  30. GRB 080710: Swift XRT position
  31. New Swift-XRT GRB products available online.
  32. GRB 080707: GROND Confirmation of the Optical Afterglow
  33. UVOT observations of GRB080707
  34. GRB 080707, Swift-BAT refined analysis
  35. GRB 080707: Swift XRT refined analysis
  36. GRB 080707: Enhanced Swift-XRT position
  37. GRB 080707: VLT redshift
  38. GRB 080707: GROND Detection of the Optical Afterglow Candidate
  39. GRB 080707: Swift detection of a burst
  40. Refined analysis of Swift Trigger 316063, is IGR J08408-4503
  41. Trigger 316063: Swift detection of a transient
  42. GRB 080703: GROND Upper Limits
  43. GRB 080702B: GROND Upper Limits
  44. GRB 080703: UVOT Follow-Up Observation
  45. GRB 080703: VLT observations of the afterglow
  46. GRB 080703: Enhanced Swift-XRT position
  47. GRB 080703, Swift-BAT refined analysis
  48. GRB 080702B Swift-BAT refined analysis
  49. GRB 080703: Swift detection of a burst with optical afterglow
  50. GRB 080703A: ROTSE-III Detection of Optical Counterpart
  51. No radio detection from the short GRB 080702A
  52. Swift/UVOT observation of GRB080702A
  53. GRB 080702B: Swift XRT and UVOT observations
  54. GRB 080625: Suzaku WAM observation of the prompt emission
  55. GRB 080701A: Early RAPTOR optical limits
  56. Swift Trigger 315630: Swift/UVOT Upper Limits
  57. GRB 080702A, Swift-BAT refined analysis
  58. GRB 080702A: Swift-XRT Team refined analysis
  59. GRB 080702B : Burst detected in BAT during Swift slew
  60. GRB 080702A: Enhanced Swift-XRT position
  61. Swift Trigger 315630: TLS R-band observation
  62. Swift Trigger 315630: Probably not a GRB
  63. GRB 080702: Swift detection of a short burst
  64. GRB 080701A, VATT optical upper limit
  65. TLS I-Band Observation of GRB 080701A
  66. GRB 080701A: Swift/UVOT Upper Limits
  67. GRB 080701: Enhanced Swift-XRT position
  68. GRB 080701A, Swift-BAT refined analysis
  69. Trigger 315630: Swift detection of a possible burst
  70. GRB 080701: Swift-XRT Prompt Analysis
  71. GRB 080701: Swift detection of a burst
  72. GRB 080623: Suzaku WAM observation of the prompt emission
  73. GRB 080625: Further observations from OSN
  74. GRB 080625:Swift-XRT detection of the afterglow
  75. GRB 080625: Swift/UVOT Detection of an Optical Afterglow
  76. GRB 080625: Observations at OSN
  77. GRB 080625: Gamma Ray Burst Localization by SuperAGILE
  78. GRB 080623: GROND upper limits
  79. GRB 080623: Swift-XRT refined analysis
  80. GRB 080623, Swift-BAT refined analysis
  81. GRB 080623: Enhanced Swift-XRT position
  82. GRB 080623: TAROT La Silla observatory optical observations
  83. GRB 080623: Swift XRT prompt analysis
  84. Swift trigger 314975 is not a GRB
  85. GRB080607: optical observation
  86. GRB 070809: Putative host galaxy and redshift
  87. VLA upper limit on INTEGRAL burst GRB 080613A
  88. GRB080613B: MITSuME upper limits
  89. GRB080613A: Optical upper limits with Okayama MITSuME telescope
  90. GRB 080603A: optical observations on June 04
  91. GRB 080613A: Swift-XRT detection of the afterglow
  92. GRB 080613A: GROND Confirmation of the Afterglow Candidate
  93. GRB 080613B: GROND Upper Limits
  94. GRB 080613B - NOT optical and IR nondetections
  95. GRB 080613B, Swift-BAT refined analysis
  96. GRB 080613B: Swift-XRT refined analysis
  97. GRB 080514B: Spectroscopic constraints and probable host galaxy
  98. GRB 080613B: Swift detection of a burst
  99. GRB 080613: Faulkes Telescope North optical candidate
  100. GRB 080613 : a long GRB detected with INTEGRAL

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