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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"

32720 results found.

  1. GRB 070911, Swift-BAT refined analysis
  2. IPN search for a GRB associated with TAROT transient on August 31
  3. Intense burst from SGR 1806-20 detected on September 7
  4. GRB 070809: Confirmation of optical transient
  5. Observations of possible TAROT GRB transient near IC 4779
  6. GRB 070810b: Image Subtraction of Multiple Keck Observations
  7. Las Campanas observations of possible TAROT GRB transient near IC
  8. Konus-Wind observation of GRB 070824
  9. Konus-Wind observation of very bright GRB 070821
  10. GRB 070731: Swift/UVOT Upper Limit
  11. GRB 070805: UVOT afterglow candidate retraction
  12. GRB070810b: optical candidate
  13. GRB 070810A: ROTSE-III Refined Analysis
  14. GRB 061110A: redshift confirmed
  15. GRB 070810B : Faulkes Telescope South Observations
  16. GRB 070810A: Continued Keck Imaging
  17. GRB 070810B: Keck spectroscopy of possible host galaxies
  18. GRB070810B: Swift/UVOT Upper Limits
  19. GRB 070810B: XRT refined analysis
  20. GRB 070810B, Swift-BAT refined analysis
  21. GRB 070809: Swift/UVOT Corrected Photometry
  22. Swift Trigger 287421: False trigger due to star tracker loss
  23. GRB 070810A: Swift-BAT refined analysis
  24. GRB 070810B: Xinglong TNT optical Upper Limit
  25. GRB070810B: Optical observations with KANATA
  26. GRB 070809: Swift/UVOT Upper Limits
  27. VLA upper limit on the short hard burst GRB 070729
  28. GRB 070810: Keck redshift and photometry
  29. No radio detection in superAGILE burst 070724B
  30. GRB 070809: Keck Imaging
  31. GRB 070810: Swift-XRT Team Refined Analysis
  32. GRB 070809: Swift-XRT refined analysis
  33. GRB 070810: Swift/UVOT Optical Counterpart
  34. GRB 070809, Swift-BAT refined analysis
  35. GRB 070809: Optical Pre-imaging from Palomar
  36. GRB 070808: Swift/UVOT upper limits
  37. GRB 070809: ROTSE-III Optical Limits
  38. GRB 070808 : Faulkes Telescope South Observations
  39. GCN Swift XRT update position notices and enhanced position circulars
  40. GRB 070808: Swift XRT refined analysis
  41. GRB 070808, Swift-BAT refined analysis
  42. GRB 070808: OPTIMA-Burst optical upper limit
  43. GRB 070808: Xinglong TNT optical Upper Limit
  44. GRB070808: Optical observations with KANATA
  45. GRB 070808: ROTSE-III Optical Limits
  46. GRB061121A: PROMPT Observations
  47. GRB070805 XRT and UVOT afterglow candidate
  48. GRB070612A: Radio upper limit from GMRT
  49. GRB 070721B: correct afterglow position
  50. Swift/UVOT observations of GRB070805
  51. GRB 070805, Swift-BAT refined analysis
  52. GRB 070805: Swift XRT initial analysis.
  53. UVOT observations of SAXJ1810.8-2609
  54. VLA non-detection of GRB 070721B
  55. GRB 070802: REM optical observations
  56. GRB 070724B: Swift-XRT afterglow confirmation
  57. GRB 070802: Swift-XRT refined analysis
  58. GRB070802: Swift/UVOT upper limits
  59. GRB 070802: Confirmation of the optical afterglow
  60. GRB 070802, Swift-BAT refined analysis
  61. GRB 070802: VLT redshift
  62. GRB 070802: refined Swift XRT position
  63. GRB 070802: V-band detection of the candidate afterglow
  64. GRB 070802: LCO I-band candidate
  65. GRB 070802: GROND J band candidate
  66. GRB 070802: LCO optical observations
  67. GRB 070802: Swift detection of a burst
  68. Konus-A observation of GRB 070729
  69. Swift/UVOT detection of GRB070714B
  70. AGILE-ACS position for the SGR 1806-20 July 27 burst
  71. GRB 070729: LCO optical imaging
  72. VLA upper limit on short hard burst GRB 070714B
  73. Intense burst from SGR 1806-20 detected on July 27
  74. GRB070729: Swift/UVOT upper limits
  75. GRB 070729: Swift-XRT refined analysis
  76. GRB 070729, Swift-BAT refined analysis
  77. GRB 070729: Magellan NIR Observations
  78. GRB 070724B: P60 Observations
  79. GRB 070724B: Swift/UVOT Upper limits
  80. GRB070721A: Swift/UVOT Detection of a Weak Afterglow
  81. GRB 070724B: Swift-XRT afterglow likely candidate
  82. GRB 070721A: optical observations
  83. GRB 070724A: further VLT observations
  84. GRB 070724B: Suzaku WAM observation of the prompt emission
  85. Konus-Wind observation of GRB 070724B
  86. GRB 070724B: Analysis of AGILE gamma-ray data
  87. GRB 070724B: Swift-XRT afterglow candidates
  88. Four radio sources in Swift-XRT error box of GRB 070724
  89. GRB 070724: optical observations
  90. GRB070724: Host galaxy redshift
  91. GRB 070724: P60 and Gemini Observations
  92. GRB 060814 - Keck host detection and redshift
  93. GRB 070724: Closer association with DSS source
  94. Swift/UVOT refined analysis of GRB070724
  95. GRB 070724: Swift-XRT Team refined analysis
  96. GRB 070724: Pre-Imaging Shows a Source in the XRT Error Circle
  97. Short-Hard GRB070714B: PROMPT Observations
  98. GRB 070724, Swift-BAT refined analysis of a short burst
  99. GRB 070721B: further observations and analysis
  100. GRB 070714B: Keck observations

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