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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"

19587 results found.

  1. GRB 101201A: GROND Detection of the Optical/NIR Afterglow
  2. GRB 101123A: MASTER prompt optical observations
  3. GRB 101123A: Fermi GBM detection
  4. GRB 101117B: GROND Upper limits
  5. GRB 101117B: Swift/UVOT Observations of the Optical Afterglow
  6. XRF 101117A: Palomar Transient Factory Observations
  7. GRB101114A: Swift/UVOT Upper Limits
  8. GRB 101117B: Enhanced Swift-XRT position
  9. GRB 101117B: Swift detection of a burst
  10. GRB 101114A: GROND Upper limits
  11. Fermi GBM detection of a burst from a galactic source
  12. GRB 101114A: Swift-XRT candidate afterglow detection and analysis
  13. GRB 101112A: Fermi GBM detection
  14. GRB 101112A: optical observations
  15. GRB 090113, the review of the sky area in plate archives
  16. GRB 101030A : MOA optical observation
  17. GRB 101030A: GROND optical/NIR afterglow candidate
  18. GRB 101030A: Swift/UVOT Upper Limits
  19. GRB 101030A: Enhanced Swift-XRT position
  20. GRB 101030A: Swift detection of a burst
  21. GRB 090111, the review of the sky area in plate archives (1976-1996)
  22. GRB 101024A: GROND optical/NIR observations
  23. GRB 101024A: Swift XRT refined analysis
  24. GRB 101024A: Zadko observatory - Gingin. Optical observations
  25. GRB 101024A: Fermi GBM observation
  26. GRB 101023A: Fermi GBM observation
  27. GRB101024A: Swift/UVOT
  28. GRB 101024A: Enhanced Swift-XRT position
  29. Swift/UVOT observations of GRB101023A
  30. GRB 101024A: Swift detection of a burst with an optical afterglow
  31. GGRB 101023A: GROND detection of the optical-NIR afterglow
  32. GRB 101023A: Gemini discovery of optical afterglow
  33. GRB 101023A: Enhanced Swift-XRT position
  34. GRB 101023A: REM NIR observations
  35. GRB 101023A: Swift detection of a burst
  36. GRB 101020A, Swift-BAT refined analysis
  37. GRB 101017A: Swift/UVOT Observations
  38. GRB 101008A: optical observations
  39. GRB101017A: MITSuME Okayama optical upper limits
  40. GRB 101017A: Enhanced Swift-XRT position
  41. GRB 101017A: Swift detection of a burst with optical counterpart
  42. GRB 101011A: Fermi GBM detection
  43. GRB 101014A: Fermi GBM detection
  44. GRB 100902A: D50 optical limit
  45. GRB 101011A: Swift/UVOT observations
  46. GRB 101011A, GROND upper limits
  47. GRB 101011A: Zadko observatory - Gingin optical observations
  48. GRB 101011A: XRT Refined Analysis
  49. GRB 101011A: Swift/UVOT Observations of a Possible Optical Afterglow
  50. GRB 101011A: Enhanced Swift-XRT position
  51. GRB 101011A: Swift detection of a burst
  52. GRB101008A, GROND detection of a fading afterglow
  53. GRB 101008A: SAO RAS optical observations
  54. GRB 100915 optical upper limit
  55. GRB 101008: Swift/UVOT Upper Limits
  56. GRB 101008A: Enhanced Swift-XRT position
  57. GRB 101008A: Swift/XRT Detection of an Afterglow with no UVOT Counterpart
  58. Swift Trigger 435520 is probably not a GRB
  59. GRB100925A/MAXI J1659-152 MITSuME Ishigakijima and Okayama Optical Observation
  60. GRB 100925A / MAXI J1659-152: SARA-S Observations
  61. GRB 100925A/MAXI J1659-152: Submm observations from APEX
  62. GRB 100925A/MAXI J1659-152 - NOT optical observations
  63. GRB 100925A: Nearby DSS Source - SN-GRB or new Galactic transient?
  64. GRB 100924A: GROND detection of an optical/NIR afterglow
  65. GRB 100925A: Swift detection of a burst
  66. GRB 100924A: Swift-BAT refined analysis
  67. GRB 100917A: TAROT La Silla observatory optical observations
  68. GRB 100915A: TAROT Calern observatory optical observations
  69. GRB100906A: Ashra-1 observation of early optical emission
  70. GRB100915A: MITSuME Ishigakijima Optical upper limits
  71. GRB 100915B: GRT Optical Observation
  72. GRB 100915A: GRT Optical Observation
  73. GRB 100915A: Swift/UVOT Upper Limits
  74. GRB 100915A: Enhanced Swift-XRT position
  75. GRB 100915A: Swift detection of a likely burst
  76. Swift BAT Trigger 433953 probably not a GRB
  77. GRB100909A: MITSuME Ishigakijima Optical upper limits
  78. GRB 100909A: Swift/UVOT observations
  79. GRB 100901A: errata of GRB name in GCN 11270
  80. GRB 100909A: Swift-XRT refined analysis
  81. GRB 100906A: optical observations at Mt.Terskol
  82. GRB 100901A: optical observation in Maidanak, break confirmation
  83. GRB 100902A : Confirmation of afterglow and re-brightening with CFHT r’-band imaging
  84. GRB 100909A: Swift target of opportunity observation
  85. GRB100906A: detection at 15GHz
  86. GRB100901A: IAO optical upper limits at 4 days after the burst
  87. EVLA detection of radio afterglow of GRB100901A
  88. GRB100906A: R band observations
  89. GRB100906A: non-detection at 15GHz
  90. GRB100906A: Optical observations at IAO
  91. GRB 100906A: Enhanced Swift-XRT position
  92. GRB 100906A: Swift/UVOT Observations
  93. GRB100906A: MITSuME Okayama Optical Observation
  94. GRB 100905A: Swift/UVOT Upper Limits
  95. GRB 100906A: Swift detection of a burst with an optical afterglow
  96. GRB 100829A: MASTER optical observations
  97. GRB100905A: Optical upper limits at IAO
  98. GRB100905A: MITSuME Okayama optical upper limits
  99. GRB100905A: 1.5m OSN upper limit
  100. GRB 100905A: Enhanced Swift-XRT position

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