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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"

37691 results found.

  1. GRB 070808: Swift detection of a burst
  2. GRB061121A: PROMPT Observations
  3. GRB070805 XRT and UVOT afterglow candidate
  4. Swift trigger on 4U 1700-377 while star tracker loss-of-lock
  5. GRB070612A: Radio upper limit from GMRT
  6. GRB 070721B: correct afterglow position
  7. GRB 070805, Swift-BAT refined analysis
  8. GRB 070805: Swift XRT initial analysis.
  9. GRB 070805: Swift/UVOT initial analysis
  10. GRB 070805: Swift detection of a burst
  11. VLA non-detection of GRB 070721B
  12. GRB 070802: REM optical observations
  13. GRB 070724B: Swift-XRT afterglow confirmation
  14. GRB 070802: Swift-XRT refined analysis
  15. GRB 070802: Confirmation of the optical afterglow
  16. GRB 070802, Swift-BAT refined analysis
  17. GRB 070802: VLT redshift
  18. GRB 070802: refined Swift XRT position
  19. GRB 070802: V-band detection of the candidate afterglow
  20. GRB 070802: LCO I-band candidate
  21. GRB 070802: GROND J band candidate
  22. GRB 070802: LCO optical observations
  23. GRB 070802: Swift detection of a burst
  24. GRB 070731, Swift-BAT refined analysis
  25. Konus-A observation of GRB 070729
  26. Swift/UVOT detection of GRB070714B
  27. GRB 070724B: pseudo-z ~ 1.10 from prompt emission spectrum
  28. GRB 070729: LCO optical imaging
  29. VLA upper limit on short hard burst GRB 070714B
  30. Intense burst from SGR 1806-20 detected on July 27
  31. GRB 070729: Swift-XRT refined analysis
  32. GRB 070729, Swift-BAT refined analysis
  33. GRB 070729: Magellan NIR Observations
  34. GRB 070724B: P60 Observations
  35. GRB 070729: Swift detection of a short hard burst
  36. GRB 070724B: Swift/UVOT Upper limits
  37. GRB 070724B: Swift-XRT afterglow likely candidate
  38. GRB 070721A: optical observations
  39. GRB 070724A: further VLT observations
  40. GRB 070724B: Suzaku WAM observation of the prompt emission
  41. Konus-Wind observation of GRB 070724B
  42. GRB 070724B: Analysis of AGILE gamma-ray data
  43. GRB 070724B: Swift-XRT afterglow candidates
  44. GRB 070724b: First Gamma Ray Burst Localization by SuperAGILE onboard
  45. Four radio sources in Swift-XRT error box of GRB 070724
  46. GRB 070724: optical observations
  47. GRB 070724: P60 and Gemini Observations
  48. GRB 060814 - Keck host detection and redshift
  49. GRB 070724: IR observations
  50. GRB 070724: Closer association with DSS source
  51. GRB 070724: Swift-XRT Team refined analysis
  52. GRB 070724: Pre-Imaging Shows a Source in the XRT Error Circle
  53. Short-Hard GRB070714B: PROMPT Observations
  54. GRB 070724, Swift-BAT refined analysis of a short burst
  55. GRB 070721B: further observations and analysis
  56. GRB 070724: Swift detection of a burst
  57. GRB 070326: Detection of first burst from BAT Slew Survey (BATSS)
  58. GRB 070714B: Keck observations
  59. GRB 070721B: optical observations and proposed redshift
  60. GRB 070721B, Further Swift-BAT refined analysis
  61. Swift/UVOT Observations of GRB070721A
  62. GRB 070721B : Faulkes Telescope South observations
  63. GRB 070721B: Swift-XRT refined analysis
  64. GRB 070721A : Faulkes Telescope South optical limit
  65. GRB 070721A: Swift/XRT refined analysis
  66. GRB 070721B, Swift-BAT refined analysis
  67. GRB 070721A, Swift-BAT refined analysis
  68. GRB070721B: A bright UVOT candidate
  69. GRB 070721B: Swift detection of a burst
  70. GRB 070721: Swift detection of a possible burst
  71. GRB 070714B: Swift/BAT and Suzaku/WAM joint spectral analysis
  72. GRB 070714B : Suzaku WAM observation of the prompt emission
  73. GRB 070714A: Swift-BAT T_zero
  74. Erratum : Suzaku WAM observation of GRB 070704
  75. GRB 070714A: Swift/UVOT Upper limits
  76. GRB 070714B: Swift/UVOT Upper Limits
  77. GRB 070714B: Swift-BAT spectral lag for the SHB
  78. GRB 070714B: confirmation of optical afterglow
  79. GRB 070616: No Evidence for I Band Afterglow
  80. GRB 070714A: Swift XRT refined analysis
  81. GRB070714B: Swift-XRT refined analysis
  82. GRB 070707: Swift-XRT follow-up observations
  83. GRB 070714b ("Bastille"): Optical Pre-Imaging (Clarification)
  84. GRB 070714 ("Bastille"): Optical Pre-Imaging
  85. GRB 070714B, Swift-BAT refined analysis of the short hard burst
  86. GRB 070714A, Swift-BAT refined analysis
  87. GRB 070714 : Liverpool Telescope optical counterpart ?
  88. GRB 070714: Swift detection of a bright burst, possibly short
  89. Swift detection of a possible burst (Trigger 284850)
  90. SN 2007bg - off-axis GRB?
  91. GRB 070704: RTT150 optical observations
  92. GRB 070704: Suzaku/WAM observation of the prompt emission
  93. Konus-Wind observation of GRB 070707
  94. GRB 070707: optical afterglow
  95. GRB 070707: object inside XRT error circle
  96. Swift XRT observation of GRB 070707
  97. GRB 070707: VLT observations
  98. INTEGRAL GRB 070707 is a short hard burst
  99. INTEGRAL GRB 070707 is a short hard burst
  100. GRB 070707: A long GRB detected by INTEGRAL

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