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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"

14930 results found.

  1. GRB 101219B: Swift detection of a burst with an optical afterglow
  2. GRB 101219A: Magellan NIR observations
  3. GRB 101219A: Swift detection of a short hard burst
  4. Redshift solution(s) for GRB101213A from Swift-XRT data
  5. GRB 101213A: Swift detection of a burst
  6. GRB101204A GROND Detection of the Optical/NIR Afterglow
  7. GRB 101201A: Swift/UVOT Detection
  8. GRB 101201A: GROND Detection of the Optical/NIR Afterglow
  9. Swift detection of MAXIJ1409-619
  10. GRB 101123A: Fermi GBM detection
  11. Optical observation of GRB 101024A
  12. GRB 101117B: Swift/UVOT Observations of the Optical Afterglow
  13. GRB 101112A: OSN and BTA observations
  14. GRB 101117B: Swift detection of a burst
  15. XRF101117A: MAXI/GSC detection of a short X-ray transient
  16. Fermi GBM detection of a burst from a galactic source
  17. GRB 101114A: Swift-XRT candidate afterglow detection and analysis
  18. Possible detection of INTEGRAL burst GRB 101112A by the EVLA
  19. GRB 101112A: Fermi GBM detection
  20. GRB 101112A - XRT source detection/analysis
  21. GRB 101112A: BOOTES-2/TELMA optical afterglow candidate
  22. GRB 101030A: Swift detection of a burst
  23. GRB 101023A: miniTAO/ANIR NIR detection
  24. Swift/UVOT observations of GRB101023A
  25. GRB 101024A: Swift detection of a burst with an optical afterglow
  26. GGRB 101023A: GROND detection of the optical-NIR afterglow
  27. GRB 101023A: Swift detection of a burst
  28. GRB 101020A: Swift detection of a burst
  29. GRB 101008A: optical observations
  30. GRB 101014A: Fermi LAT detection
  31. GRB 101017A: Swift detection of a burst with optical counterpart
  32. GRB 101011A: Fermi GBM detection
  33. GRB 101014A: Fermi GBM detection
  34. GRB 100906A: D50 optical detection
  35. GRB 101011A: Swift detection of a burst
  36. GRB101008A, GROND detection of a fading afterglow
  37. GRB 101008A: Swift/XRT Detection of an Afterglow with no UVOT Counterpart
  38. GRB 101008A: Swift detection of a burst
  39. Swift Trigger 435520 is probably not a GRB
  40. GRB 100928A: Swift detection of a burst
  41. GRB 100925A / MAXI J1659-152: WSRT Radio and Polarization Detection
  42. GRB 100925A / MAXI J1659-152: BOOTES-2/TELMA and IAC80 optical observations
  43. GRB 100924A: GROND detection of an optical/NIR afterglow
  44. GRB 100925A: Swift detection of a burst
  45. GRB 100924A: Swift detection of a burst
  46. GRB 100916A: Fermi GBM detection
  47. GRB 100917A: Swift detection of a burst
  48. GRB 100915A: Swift detection of a likely burst
  49. GRB 100910A: Fermi GBM detection
  50. GRB 100909A: a long GRB detected by INTEGRAL
  51. GRB100906A: detection at 15GHz
  52. EVLA detection of radio afterglow of GRB100901A
  53. GRB 100901A: Confirmation of WSRT Radio Detection
  54. GRB100906A: non-detection at 15GHz
  55. GRB 100906A: TLS Monitoring
  56. GRB 100901A: TLS Detection at 5.5 days
  57. GRB 100906A: Swift/UVOT Observations
  58. GRB 100906A: Swift detection of a burst with an optical afterglow
  59. GRB 100905A: UKIRT zJHK Observation
  60. GRB 100901A: Possible WSRT Radio Detection
  61. GRB 100905A: Swift detection of a burst
  62. Optical observations of GRB 100901A
  63. GRB 100902A: UKIRT JK Observation
  64. GRB 100904A: Swift detection of a burst
  65. Tentative redshift of GRB100902A from Swift-XRT data
  66. GRB 100902A: Swift detection of a burst
  67. GRB 100901A: ROTSE-III Detection
  68. GRB 100901A: Swift detection of a burst with an optical afterglow
  69. GRB 100823A: MAXI/GSC detection
  70. GRB 100823A - second epoch WHT observations
  71. GRB 100823A: Swift detection of a burst
  72. EVLA radio afterglow detection of GRB 100814A
  73. GRB 100814B: Fermi GBM detection
  74. GRB 100814A : Liverpool Telescope Observations
  75. GRB 100816A: Gemini-N spectroscopy
  76. GRB 100816A: CQUEAN riz-band Detection, Host Galaxy?
  77. GRB 100816A: TAROT Calern observatory optical detection
  78. GRB 100816A: Swift detection of a possibly short burst with optical afterglow
  79. GRB 100814A: GROND Detection of the Optical/NIR Afterglow
  80. GRB 100814A: IAC80 R-band observations
  81. GRB 100814A: Swift detection of a burst with an optical afterglow
  82. GRB 100814A: ROTSE-III Detection of Optical Counterpart
  83. GRB 100807A: Swift detection of a burst
  84. GRB 100805A: ROTSE-III Optical detection
  85. GRB 100805A: Swift/UVOT Observations of the Optical Afterglow
  86. Trigger 430975: Swift detection of a possible burst
  87. GRB 100805A: I-band detection from 1.23m CAHA telescope.
  88. GRB 100805A: Swift detection of a burst with an optical counterpart
  89. GRB 100802A: NOT optical observation
  90. GRB 100802A: Swift/UVOT Possible Optical Afterglow
  91. GRB 100802A: Possible Swift/UVOT Detection of Optical Afterglow
  92. GRB 100802A: Swift detection of a burst
  93. GRB 100725B: TELMA optical observation
  94. GRB 100728B: Swift/UVOT Observations
  95. GRB 100728A: GROND Detection of the NIR Afterglow Candidate
  96. GRB 100728B: GROND Detection of the NIR Afterglow
  97. GRB 100728B: optical detection
  98. GRB 100728B: KAIT optical afterglow detection (correction)
  99. GRB 100728B: Swift detection of a burst with an optical counterpart
  100. GRB 100728A: KAIT optical afterglow detection

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