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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"

5846 results found.

  1. GRB110213A: MITSuME Okayama Optical Observation
  2. GRB 110212A: ROTSE-III Optical Limits
  3. GRB 110212A: Swift detection of a burst
  4. GRB 110201A: optical observations
  5. GRB 110210A: Swift detection of a burst
  6. GRB 110205A : HCT optical observations
  7. GRB 110206A: GROND detection of afterglow candidate
  8. GRB 110206A: UVOT detection of afterglow candidate
  9. GRB 110205A: Lightbuckets Optical Observations
  10. GRB 110205A: Newcastle Observatory Optical Observations
  11. GRB110201A: MITSuME Okayama optical upper limits
  12. GRB 110201A: MASTER optical observations
  13. GRB 110201A: Swift detection of a burst
  14. Swift Trigger 442539 is probably not a GRB
  15. GRB 110112A: MITSuME Akeno and Okayama optical upper limits
  16. GRB 110102A: Swift detection of a burst with an optical detection
  17. GRB101224A: MITSuME Okayama optical upper limits
  18. XRF 101117A, RIMOTS optical upper limits
  19. Konus-Wind observation of GRB 101130A
  20. IPN Localization of GRB101130 (possible short duration burst)
  21. GRB 101030A: Swift detection of a burst
  22. GRB 101020A: Swift detection of a burst
  23. GRB 101017A: Swift detection of a burst with optical counterpart
  24. Swift Trigger 435520 is probably not a GRB
  25. GRB 100925A / MAXI J1659-152: MASTER optical observations
  26. GRB 100925A / MAXI J1659-152: Optical observation with the Kottamia 188cm telescope
  27. GRB100925A/MAXI J1659-152 MITSuME Ishigakijima and Okayama Optical Observation
  28. MAXI J1659-152: Swift-BAT refined analysis (triggers 434928 and 434931)
  29. GRB 100909A: Faulkes Telescope North afterglow candidate
  30. GRB 100909A: a long GRB detected by INTEGRAL
  31. GRB100906A: detection at 15GHz
  32. GRB100901A: IAO optical upper limits at 4 days after the burst
  33. GRB 100906A: GRAS-007 optical observations
  34. GRB100906A: R band observations
  35. GRB100906A: Optical observations at IAO
  36. GRB100906A: MITSuME Okayama Optical Observation
  37. GRB 100906A: Ondrejov 65cm observations
  38. GRB 100901A: ISON-NM optical observations
  39. GRB100905A: Optical upper limits at IAO
  40. GRB100905A: MITSuME Okayama optical upper limits
  41. GRB 100905A: MASTER Prompt Optical Observations
  42. GRB 100905A: Swift detection of a burst
  43. GRB10901A: Murikabushi telescope observation at 3 days after the burst
  44. GRB100902A: Optical upper limits at IAO
  45. GRB10901A: Optical observations at IAO
  46. IPN Triangulation of the very bright GRB 100829A
  47. GRB 100901A: HCT optical observations
  48. GRB 100901A: Kanata Telescope observation of the optical afterglow
  49. GRB100901A: MITSuME Okayama Optical Observation at 1 day after the burst
  50. GRB 100901A: ISON-NM optical observations
  51. GRB 100901A : HCT optical observations
  52. GRB 100901A: THO optical observations
  53. GRB100901A: MITSuME Okayama Optical Observation
  54. GRB 100901A: optical observation at Mt.Terskol
  55. GRB 100814A: ISON-NM optical observations
  56. GRB 100814A : Liverpool Telescope Observations
  57. GRB 100814A : Lulin optical observation
  58. GRB 100816A : Lulin r'-band observation
  59. GRB 100814A: CQUEAN r- and i-band Observation
  60. GRB 100814A: Swift detection of a burst with an optical afterglow
  61. GRB 100807A: P200 Infrared Observations
  62. GRB 100807A: P60 Optical Afterglow Discovery
  63. GRB 100807A: ROTSE-III Optical Limits
  64. GRB 100807A: Swift detection of a burst
  65. GRB 100802A: NOT optical observation
  66. GRB 100802A: Possible Swift/UVOT Detection of Optical Afterglow
  67. GRB 100802A: Swift detection of a burst
  68. GRB 100728A: GROND Detection of the NIR Afterglow Candidate
  69. GRB 100727A: Swift detection of a burst
  70. GRB 100725B: Swift detection of a burst
  71. GRB 100725A: Swift detection of a burst
  72. GRB 100724A, GROND detection of an afterglow candidate
  73. Fermi GBM trigger 300370702 (100709513) is not a GRB
  74. GRB 100704A: Swift detection of a burst
  75. GRB 100526A: Gemini/NIRI afterglow confirmation and host galaxy
  76. GRB100625A: GROND confirmation of constant source
  77. GRB 100625A Gemini-South 2nd epoch imaging
  78. GRB 100621A MOA-II optical limit
  79. GRB 100621A: VLT/X-shooter redshift
  80. GRB 100621A: ROTSE-III Optical Limits
  81. GRB 100615A: Swift detection of a burst
  82. GRB 100606A: Swift detection of a burst
  83. GRB100526B: GROND Upper limits
  84. GRB 100526A: Swift detection of a burst
  85. GRB 100522A: GROND observations, upper limits
  86. GRB 100522A: Swift detection of a burst
  87. GRB 100518A: GROND afterglow observation and photo-z
  88. GRB 100514A: optical afterglow confirmation
  89. GRB 100514A: Enhanced Swift-XRT position
  90. GRB 100514A: Swift detection of a burst
  91. GRB 100513A: Swift detection of a burst
  92. GRB 100510A: MAXI/GSC detection
  93. GRB 100508A: ROTSE-III Optical Limits
  94. GRB 100508A: Swift detection of a burst
  95. An SGR-like burst from the magnetar 1E 1841-04.5 in Kes 73
  96. GRB 100503A: Fermi GBM detection
  97. GRB 100504A: Swift detection of a burst
  98. Trigger 421072: Possible Swift detection of a GRB or transient
  99. GRB 100423A: CrAO optical observations
  100. GRB 100425A: Swift detection of a burst

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