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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"

28118 results found.

  1. Intense burst from SGR 1806-20 detected on September 7
  2. GRB 070809: Confirmation of optical transient
  3. Candidate Orphan GRB Optical Transient in IC 4779
  4. Las Campanas observations of possible TAROT GRB transient near IC
  5. Orphan GRB candidate in IC 4779 at TAROT La Silla observatory
  6. GRB 070824 - Combined SuperAGILE/IPN Localization
  7. GRB 070731: Swift/UVOT Upper Limit
  8. GRB 070805: UVOT afterglow candidate retraction
  9. GRB 070810B : Faulkes Telescope South Observations
  10. GRB 070810A: Continued Keck Imaging
  11. GRB 070810B: Keck spectroscopy of possible host galaxies
  12. GRB070810B: Swift/UVOT Upper Limits
  13. GRB 070810B: XRT refined analysis
  14. GRB 070810B, Swift-BAT refined analysis
  15. Swift Trigger 287421: False trigger due to star tracker loss
  16. GRB 070810A: Swift-BAT refined analysis
  17. GRB 070810B: Xinglong TNT optical Upper Limit
  18. GRB070810B: Optical observations with KANATA
  19. A giant outburst from Cygnus X-1 detected by Konus-Wind and Suzaku-WAM
  20. GRB 070809: Swift/UVOT Upper Limits
  21. VLA upper limit on the short hard burst GRB 070729
  22. No radio detection in superAGILE burst 070724B
  23. GRB 070809: Keck Imaging
  24. GRB 070810: Swift-XRT Team Refined Analysis
  25. GRB 070809: Swift-XRT refined analysis
  26. GRB 070810: enhanced Swift-XRT position
  27. GRB 070810: Swift/UVOT Optical Counterpart
  28. GRB 070809, Swift-BAT refined analysis
  29. GRB 070808: Swift/UVOT upper limits
  30. GRB 070809: Swift detection of a short burst
  31. GRB 070808 : Faulkes Telescope South Observations
  32. GCN Swift XRT update position notices and enhanced position circulars
  33. GRB 070808: Swift XRT refined analysis
  34. GRB 070808, Swift-BAT refined analysis
  35. GRB 070808: OPTIMA-Burst optical upper limit
  36. GRB 070808: Xinglong TNT optical Upper Limit
  37. GRB070808: Optical observations with KANATA
  38. GRB070808 - SDSS Pre-Burst Observations
  39. GRB 070808: ROTSE-III Optical Limits
  40. GRB070805 XRT and UVOT afterglow candidate
  41. GRB070612A: Radio upper limit from GMRT
  42. GRB 070721B: correct afterglow position
  43. Swift/UVOT observations of GRB070805
  44. GRB 070805, Swift-BAT refined analysis
  45. UVOT observations of SAXJ1810.8-2609
  46. Swift detection of a outburst from SAX J1810.8-2609
  47. VLA non-detection of GRB 070721B
  48. GRB 070802: REM optical observations
  49. GRB 070802: Swift-XRT refined analysis
  50. GRB070802: Swift/UVOT upper limits
  51. GRB 070802, Swift-BAT refined analysis
  52. GRB 070802: V-band detection of the candidate afterglow
  53. GRB 070802: GROND J band candidate
  54. GRB 070731, Swift-BAT refined analysis
  55. Konus-A observation of GRB 070729
  56. Swift/UVOT detection of GRB070714B
  57. VLA upper limit on short hard burst GRB 070714B
  58. Intense burst from SGR 1806-20 detected on July 27
  59. GRB070729: Swift/UVOT upper limits
  60. GRB 070729: Swift-XRT refined analysis
  61. GRB 070729, Swift-BAT refined analysis
  62. GRB 070724B: P60 Observations
  63. GRB 070724B: Swift/UVOT Upper limits
  64. GRB 070724B: Swift-XRT afterglow likely candidate
  65. GRB 070721A: optical observations
  66. GRB 070724A: further VLT observations
  67. GRB 070724B: Suzaku WAM observation of the prompt emission
  68. GRB 070724B: Swift-XRT afterglow candidates
  69. Four radio sources in Swift-XRT error box of GRB 070724
  70. GRB 070724: P60 and Gemini Observations
  71. GRB 060814 - Keck host detection and redshift
  72. Swift/UVOT refined analysis of GRB070724
  73. GRB 070724: Swift-XRT Team refined analysis
  74. GRB 070724, Swift-BAT refined analysis of a short burst
  75. GRB 070721B: further observations and analysis
  76. GRB 070724: Swift detection of a burst
  77. GRB 070326: Detection of first burst from BAT Slew Survey (BATSS)
  78. GRB 070714B: Keck observations
  79. GRB 070721B: optical observations and proposed redshift
  80. GRB 070721B, Further Swift-BAT refined analysis
  81. Swift/UVOT Observations of GRB070721A
  82. GRB 070721B : Faulkes Telescope South observations
  83. GRB 070721B: Swift-XRT refined analysis
  84. GRB 070721A : Faulkes Telescope South optical limit
  85. GRB 070721A: Swift/XRT refined analysis
  86. GRB 070721B, Swift-BAT refined analysis
  87. GRB 070721A, Swift-BAT refined analysis
  88. GRB070721B: A bright UVOT candidate
  89. GRB 070714B: Swift/BAT and Suzaku/WAM joint spectral analysis
  90. GRB 070714B : Suzaku WAM observation of the prompt emission
  91. GRB070714B: TNG NIR observations
  92. Erratum : Suzaku WAM observation of GRB 070704
  93. GRB 070714A: Swift/UVOT Upper limits
  94. GRB 070714B: Swift/UVOT Upper Limits
  95. GRB 070714B: confirmation of optical afterglow
  96. GRB 070616: No Evidence for I Band Afterglow
  97. GRB 070714A: Swift XRT refined analysis
  98. GRB070714B: Swift-XRT refined analysis
  99. GRB 070707: Swift-XRT follow-up observations
  100. GRB 070714B, Swift-BAT refined analysis of the short hard burst

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