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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"

32557 results found.

  1. GRB070925: Swift-XRT Afterglow confirmation
  2. GRB 070925: Gemini South Imaging
  3. GRB070925: Swift-XRT Position
  4. Update on Swift Status
  5. GRB 070920B: ROTSE-III Early Optical Limits
  6. Recent SGR1806-20 Activity
  7. GRB 070923, Swift-BAT refined analysis
  8. GRB 070920B: XRT observations
  9. GRB 070923: Galaxies within BAT localization
  10. GRB 070917: Suzaku/WAM observation of the prompt emission
  11. INTEGRAL ToO observations of SGR1806-20
  12. GRB 070920b, SMARTS optical observation
  13. GRB 070917: Confirmation of the X-ray afterglow
  14. GRB 070920b: LCO optical observations
  15. GRB 070920B, Swift-BAT refined analysis
  16. GRB 070911: Swift/BAT and Suzaku/WAM joint spectral analysis
  17. GRB 070920, Swift-BAT refined analysis
  18. SGR1806-20: Swift-BAT detection of enhanced activity
  19. GRB070917: Confirmation of optical afterglow
  20. GRB920925C: search for host galaxy
  21. GRB070917: optical observations
  22. GRB 070917: P60 Observations
  23. Konus-Wind observation of GRB 070917
  24. Swift Status and XRT Calibration Uncertainties
  25. GRB 070917: Swift-XRT observations
  26. GRB 070917: KAIT optical limits
  27. GRB 070917: MITSuME Akeno Ic upper limit
  28. GRB 070917: R band observations
  29. GRB 070917, Swift-BAT refined analysis
  30. GRB 070911: Suzaku WAM observation of the prompt emission
  31. GRB 070913: Swift-XRT detection of the possible X-ray afterglow
  32. GRB 070809: The Swift evidence for the SHB nature of this burst
  33. GRB 070913: Swift-BAT refined analysis
  34. GRB 070913: Corrected BAT position
  35. GRB 070913: SMARTS optical/IR observations
  36. GRB 070911: PAIRITEL IR Observations
  37. GRB 070911: Swift XRT refined analysis
  38. GRB 070911, Swift-BAT refined analysis
  39. IPN search for a GRB associated with TAROT transient on August 31
  40. Intense burst from SGR 1806-20 detected on September 7
  41. GRB 070809: Confirmation of optical transient
  42. Observations of possible TAROT GRB transient near IC 4779
  43. GRB 070810b: Image Subtraction of Multiple Keck Observations
  44. Las Campanas observations of possible TAROT GRB transient near IC
  45. Konus-Wind observation of GRB 070824
  46. Konus-Wind observation of very bright GRB 070821
  47. GRB 070731: Swift/UVOT Upper Limit
  48. GRB 070805: UVOT afterglow candidate retraction
  49. GRB070810b: optical candidate
  50. GRB 070810A: ROTSE-III Refined Analysis
  51. GRB 061110A: redshift confirmed
  52. GRB 070810B : Faulkes Telescope South Observations
  53. GRB 070810A: Continued Keck Imaging
  54. GRB 070810B: Keck spectroscopy of possible host galaxies
  55. GRB070810B: Swift/UVOT Upper Limits
  56. GRB 070810B: XRT refined analysis
  57. GRB 070810B, Swift-BAT refined analysis
  58. GRB 070809: Swift/UVOT Corrected Photometry
  59. Swift Trigger 287421: False trigger due to star tracker loss
  60. GRB 070810A: Swift-BAT refined analysis
  61. GRB 070810B: Xinglong TNT optical Upper Limit
  62. GRB070810B: Optical observations with KANATA
  63. GRB 070809: Swift/UVOT Upper Limits
  64. VLA upper limit on the short hard burst GRB 070729
  65. GRB 070810: Keck redshift and photometry
  66. No radio detection in superAGILE burst 070724B
  67. GRB 070809: Keck Imaging
  68. GRB 070810: Swift-XRT Team Refined Analysis
  69. GRB 070809: Swift-XRT refined analysis
  70. GRB 070810: Swift/UVOT Optical Counterpart
  71. GRB 070809, Swift-BAT refined analysis
  72. GRB 070809: Optical Pre-imaging from Palomar
  73. GRB 070808: Swift/UVOT upper limits
  74. GRB 070809: ROTSE-III Optical Limits
  75. GRB 070808 : Faulkes Telescope South Observations
  76. GCN Swift XRT update position notices and enhanced position circulars
  77. GRB 070808: Swift XRT refined analysis
  78. GRB 070808, Swift-BAT refined analysis
  79. GRB 070808: OPTIMA-Burst optical upper limit
  80. GRB 070808: Xinglong TNT optical Upper Limit
  81. GRB070808: Optical observations with KANATA
  82. GRB 070808: ROTSE-III Optical Limits
  83. GRB061121A: PROMPT Observations
  84. GRB070805 XRT and UVOT afterglow candidate
  85. GRB070612A: Radio upper limit from GMRT
  86. GRB 070721B: correct afterglow position
  87. Swift/UVOT observations of GRB070805
  88. GRB 070805, Swift-BAT refined analysis
  89. GRB 070805: Swift XRT initial analysis.
  90. UVOT observations of SAXJ1810.8-2609
  91. VLA non-detection of GRB 070721B
  92. GRB 070802: REM optical observations
  93. GRB 070724B: Swift-XRT afterglow confirmation
  94. GRB 070802: Swift-XRT refined analysis
  95. GRB070802: Swift/UVOT upper limits
  96. GRB 070802: Confirmation of the optical afterglow
  97. GRB 070802, Swift-BAT refined analysis
  98. GRB 070802: VLT redshift
  99. GRB 070802: refined Swift XRT position
  100. GRB 070802: V-band detection of the candidate afterglow

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