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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"

18506 results found.

  1. GRB 101219A: Further Gemini-South Imaging
  2. GRB 101219A - NOT observation - upper limit
  3. GRB 101219A: SARA-N Upper Limit
  4. GRB 101219A: REM optical and NIR observations
  5. GRB 101219A: Swift detection of a short hard burst
  6. XRF 101117A, RIMOTS optical upper limits
  7. GRB 101213A: Swift-XRT refined Analysis
  8. GRB 101213A: Swift/UVOT Upper Limits
  9. GRB 101213A: Enhanced Swift-XRT position
  10. GRB 101213: object within the X-ray error circle
  11. GRB 101213A: Swift detection of a burst
  12. GRB101204A: Swift/UVOT observations
  13. GRB 101204A: Swift-XRT refined Analysis
  14. GRB101204A GROND Detection of the Optical/NIR Afterglow
  15. GRB 101204A Afterglow Candidate, VATT Observations
  16. GRB 101204A Swift-XRT/UVOT afterglow candidate
  17. GRB 101129A SHB found by IPN and in ground analysis of BAT data
  18. GRB 101201A: Swift-XRT refined Analysis
  19. GRB 101201A: Swift/UVOT Detection
  20. GRB 101201A: GROND Detection of the Optical/NIR Afterglow
  21. GRB 101123A: MASTER prompt optical observations
  22. GRB 101117B: GROND Upper limits
  23. GRB 101117B: Swift/UVOT Observations of the Optical Afterglow
  24. XRF 101117A: Palomar Transient Factory Observations
  25. GRB101114A: Swift/UVOT Upper Limits
  26. GRB 101117B: Enhanced Swift-XRT position
  27. GRB 101117B: Swift detection of a burst
  28. GRB 101114A: GROND Upper limits
  29. GRB 101114A: Swift-XRT candidate afterglow detection and analysis
  30. GRB 101112A: optical observations
  31. GRB 101030A : MOA optical observation
  32. GRB 101030A: GROND optical/NIR afterglow candidate
  33. GRB 101030A: Swift/UVOT Upper Limits
  34. GRB 101030A: Swift-BAT refined analysis
  35. GRB 101030A: Enhanced Swift-XRT position
  36. GRB 101030A: Swift detection of a burst
  37. GRB 090111, the review of the sky area in plate archives (1976-1996)
  38. GRB 101024A: GROND optical/NIR observations
  39. GRB 101024A: Zadko observatory - Gingin. Optical observations
  40. GRB101024A: Swift/UVOT
  41. GRB 101024A: Enhanced Swift-XRT position
  42. Swift/UVOT observations of GRB101023A
  43. GRB 101024A: Swift detection of a burst with an optical afterglow
  44. GGRB 101023A: GROND detection of the optical-NIR afterglow
  45. GRB 101023A: Gemini discovery of optical afterglow
  46. GRB 101023A: Enhanced Swift-XRT position
  47. GRB 101023A: REM NIR observations
  48. GRB 101023A: Swift detection of a burst
  49. GRB 101020A, Swift-BAT refined analysis
  50. GRB 101017A: Swift/UVOT Observations
  51. GRB 101008A: optical observations
  52. GRB101017A: MITSuME Okayama optical upper limits
  53. GRB 101017A: Enhanced Swift-XRT position
  54. GRB 101017A: Swift detection of a burst with optical counterpart
  55. GRB 100902A: D50 optical limit
  56. GRB 101011A: Swift/UVOT observations
  57. GRB 101011A, GROND upper limits
  58. GRB 101011A: Zadko observatory - Gingin optical observations
  59. GRB 101011A: Swift/UVOT Observations of a Possible Optical Afterglow
  60. GRB 101011A: Enhanced Swift-XRT position
  61. GRB 101011A: Swift detection of a burst
  62. GRB101008A, GROND detection of a fading afterglow
  63. GRB 101008A: SAO RAS optical observations
  64. GRB 100915 optical upper limit
  65. GRB 101008: Swift/UVOT Upper Limits
  66. GRB 101008A: Enhanced Swift-XRT position
  67. GRB 101008A: Swift/XRT Detection of an Afterglow with no UVOT Counterpart
  68. Swift Trigger 435520 is probably not a GRB
  69. GRB100925A/MAXI J1659-152 MITSuME Ishigakijima and Okayama Optical Observation
  70. GRB 100925A / MAXI J1659-152: SARA-S Observations
  71. GRB 100925A/MAXI J1659-152: Submm observations from APEX
  72. GRB 100925A/MAXI J1659-152 - NOT optical observations
  73. GRB 100925A: Nearby DSS Source - SN-GRB or new Galactic transient?
  74. GRB 100924A: GROND detection of an optical/NIR afterglow
  75. GRB 100925A: Swift detection of a burst
  76. GRB 100917A: TAROT La Silla observatory optical observations
  77. GRB 100915A: TAROT Calern observatory optical observations
  78. GRB100906A: Ashra-1 observation of early optical emission
  79. GRB100915A: MITSuME Ishigakijima Optical upper limits
  80. GRB 100915B: GRT Optical Observation
  81. GRB 100915A: GRT Optical Observation
  82. GRB 100915A: Swift/UVOT Upper Limits
  83. GRB 100915A: Enhanced Swift-XRT position
  84. GRB 100915A: Swift detection of a likely burst
  85. Swift BAT Trigger 433953 probably not a GRB
  86. GRB100909A: MITSuME Ishigakijima Optical upper limits
  87. GRB 100909A: Swift/UVOT observations
  88. GRB 100901A: errata of GRB name in GCN 11270
  89. GRB 100909A: Swift-XRT refined analysis
  90. GRB 100906A: optical observations at Mt.Terskol
  91. GRB 100901A: optical observation in Maidanak, break confirmation
  92. GRB 100902A : Confirmation of afterglow and re-brightening with CFHT r’-band imaging
  93. GRB 100909A: Swift target of opportunity observation
  94. GRB100906A: detection at 15GHz
  95. GRB100901A: IAO optical upper limits at 4 days after the burst
  96. GRB100906A: R band observations
  97. GRB100906A: non-detection at 15GHz
  98. GRB100906A: Optical observations at IAO
  99. GRB 100906A: Swift-XRT refined analysis
  100. GRB 100906A: Enhanced Swift-XRT position

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