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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"

20363 results found.

  1. Konus-Wind observation of GRB 101123A
  2. GRB 101123A: Fermi GBM detection
  3. GRB 101117B: GROND Upper limits
  4. GRB 101117B: Swift/UVOT Observations of the Optical Afterglow
  5. XRF 101117A: Palomar Transient Factory Observations
  6. GRB101114A: Swift/UVOT Upper Limits
  7. GRB 101117B: Enhanced Swift-XRT position
  8. GRB 101117B: Swift detection of a burst
  9. XRF101117A: MAXI/GSC detection of a short X-ray transient
  10. GRB 101114A: GROND Upper limits
  11. GRB 101114A: Swift-XRT candidate afterglow detection and analysis
  12. GRB 101112A: optical observations
  13. GRB 101112A - XRT source detection/analysis
  14. GRB 101030A : MOA optical observation
  15. GRB 101030A: GROND optical/NIR afterglow candidate
  16. GRB 101030A: Swift/UVOT Upper Limits
  17. GRB 101030A: Enhanced Swift-XRT position
  18. GRB 101030A: Swift detection of a burst
  19. GRB 090111, the review of the sky area in plate archives (1976-1996)
  20. GRB 101024A: GROND optical/NIR observations
  21. GRB 101024A: Zadko observatory - Gingin. Optical observations
  22. GRB101024A: Swift/UVOT
  23. GRB 101024A: Swift-BAT refined analysis
  24. GRB 101024A: Enhanced Swift-XRT position
  25. Swift/UVOT observations of GRB101023A
  26. GRB 101024A: Swift detection of a burst with an optical afterglow
  27. GGRB 101023A: GROND detection of the optical-NIR afterglow
  28. GRB 101023A: Gemini discovery of optical afterglow
  29. GRB 101023A: Enhanced Swift-XRT position
  30. GRB 101023A: REM NIR observations
  31. GRB 101023A: Swift detection of a burst
  32. GRB 101020A, Swift-BAT refined analysis
  33. GRB 101017A: Swift XRT refined analysis
  34. GRB 101017A: Swift/UVOT Observations
  35. GRB 101008A: optical observations
  36. GRB101017A: MITSuME Okayama optical upper limits
  37. GRB 101017A: Enhanced Swift-XRT position
  38. GRB 101017A: Swift detection of a burst with optical counterpart
  39. Konus-Wind observation of GRB 101014A
  40. GRB 100906A: D50 optical detection
  41. GRB 100902A: D50 optical limit
  42. GRB 101011A: Swift/UVOT observations
  43. GRB 101011A, GROND upper limits
  44. GRB 101011A: Zadko observatory - Gingin optical observations
  45. GRB 101011A: XRT Refined Analysis
  46. GRB 101011A: Swift/UVOT Observations of a Possible Optical Afterglow
  47. GRB 101011A: Enhanced Swift-XRT position
  48. GRB 101011A: Swift detection of a burst
  49. GRB101008A, GROND detection of a fading afterglow
  50. GRB 101008A: SAO RAS optical observations
  51. GRB 100915 optical upper limit
  52. GRB 101008: Swift/UVOT Upper Limits
  53. GRB 101008A: Enhanced Swift-XRT position
  54. GRB 101008A: Swift/XRT Detection of an Afterglow with no UVOT Counterpart
  55. Swift Trigger 435520 is probably not a GRB
  56. GRB100925A/MAXI J1659-152 MITSuME Ishigakijima and Okayama Optical Observation
  57. GRB 100925A / MAXI J1659-152: SARA-S Observations
  58. GRB 100925A/MAXI J1659-152: Submm observations from APEX
  59. GRB100925A/MAXI J1659-152: Galactic origin from SED analysis
  60. GRB 100925A/MAXI J1659-152 - NOT optical observations
  61. GRB 100925A: Nearby DSS Source - SN-GRB or new Galactic transient?
  62. GRB 100924A: GROND detection of an optical/NIR afterglow
  63. GRB 100925A: Swift detection of a burst
  64. GRB 100924A: Swift-BAT refined analysis
  65. GRB 100917A: TAROT La Silla observatory optical observations
  66. GRB 100915A: TAROT Calern observatory optical observations
  67. GRB100906A: Ashra-1 observation of early optical emission
  68. GRB 100917A: Swift detection of a burst
  69. GRB100915A: MITSuME Ishigakijima Optical upper limits
  70. GRB 100915B: GRT Optical Observation
  71. GRB 100915A: GRT Optical Observation
  72. GRB 100915A: Swift/UVOT Upper Limits
  73. GRB 100915A: Enhanced Swift-XRT position
  74. GRB 100915B: a long GRB detected by INTEGRAL
  75. GRB 100915A: Swift detection of a likely burst
  76. GRB 100910A: Fermi GBM detection
  77. Swift BAT Trigger 433953 probably not a GRB
  78. GRB100909A: MITSuME Ishigakijima Optical upper limits
  79. GRB 100909A: Swift/UVOT observations
  80. GRB 100901A: errata of GRB name in GCN 11270
  81. GRB100909A: NOT optical afterglow confirmation
  82. GRB 100909A: Swift-XRT refined analysis
  83. GRB 100906A: optical observations at Mt.Terskol
  84. GRB 100901A: optical observation in Maidanak, break confirmation
  85. GRB 100902A : Confirmation of afterglow and re-brightening with CFHT r’-band imaging
  86. GRB 100909A: Swift target of opportunity observation
  87. GRB100906A: detection at 15GHz
  88. GRB100901A: IAO optical upper limits at 4 days after the burst
  89. EVLA detection of radio afterglow of GRB100901A
  90. GRB100906A: R band observations
  91. GRB100906A: non-detection at 15GHz
  92. GRB100906A: Optical observations at IAO
  93. GRB 100906A: Enhanced Swift-XRT position
  94. GRB 100906A: Swift/UVOT Observations
  95. GRB100906A: MITSuME Okayama Optical Observation
  96. GRB 100905A: Swift/UVOT Upper Limits
  97. GRB 100901A: TLS observations, SDSS calibration, decay slope
  98. GRB 100906A: MASTER preliminary prompt+afterglow lc
  99. GRB 100906A: Swift detection of a burst with an optical afterglow
  100. GRB 100829A: MASTER optical observations

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