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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"

45759 results found.

  1. Swift observatory off line
  2. GRB 061110A: redshift confirmed
  3. GRB 070810B : Faulkes Telescope South Observations
  4. GRB 070810A: Continued Keck Imaging
  5. GRB 070810B: Keck spectroscopy of possible host galaxies
  6. GRB070810B: Swift/UVOT Upper Limits
  7. GRB 070810B: XRT refined analysis
  8. GRB 070810B, Swift-BAT refined analysis
  9. GRB 070809: Swift/UVOT Corrected Photometry
  10. Swift Trigger 287421: False trigger due to star tracker loss
  11. GRB 070810A: Swift-BAT refined analysis
  12. GRB 070810B: Xinglong TNT optical Upper Limit
  13. GRB070810B: Optical observations with KANATA
  14. A giant outburst from Cygnus X-1 detected by Konus-Wind and Suzaku-WAM
  15. GRB 070809: Swift/UVOT Upper Limits
  16. GRB 070810B: Swift detection of a short burst
  17. VLA upper limit on the short hard burst GRB 070729
  18. GRB 070810: Keck redshift and photometry
  19. No radio detection in superAGILE burst 070724B
  20. GRB 070809: Keck Imaging
  21. GRB 070810: Swift-XRT Team Refined Analysis
  22. GRB 070809: Swift-XRT refined analysis
  23. GRB 070810: enhanced Swift-XRT position
  24. GRB 070810: Swift/UVOT Optical Counterpart
  25. GRB 070810: ROTSE-III Detection of Optical Counterpart
  26. GRB 070810: Swift detection of a burst
  27. GRB 070809, Swift-BAT refined analysis
  28. GRB 070809: Optical Pre-imaging from Palomar
  29. GRB 070808: Swift/UVOT upper limits
  30. GRB 070809: ROTSE-III Optical Limits
  31. GRB 070809: Swift detection of a short burst
  32. GRB 070808 : Faulkes Telescope South Observations
  33. GCN Swift XRT update position notices and enhanced position circulars
  34. GRB 070808: Swift XRT refined analysis
  35. GRB 070808, Swift-BAT refined analysis
  36. GRB 070808: OPTIMA-Burst optical upper limit
  37. GRB 070808: Xinglong TNT optical Upper Limit
  38. GRB070808: Optical observations with KANATA
  39. GRB070808 - SDSS Pre-Burst Observations
  40. GRB 070808: ROTSE-III Optical Limits
  41. GRB 070808: Swift detection of a burst
  42. GRB061121A: PROMPT Observations
  43. GRB070805 XRT and UVOT afterglow candidate
  44. Swift trigger on 4U 1700-377 while star tracker loss-of-lock
  45. GRB070612A: Radio upper limit from GMRT
  46. GRB 070721B: correct afterglow position
  47. Swift/UVOT observations of GRB070805
  48. GRB 070805, Swift-BAT refined analysis
  49. GRB 070805: Swift XRT initial analysis.
  50. GRB 070805: Swift/UVOT initial analysis
  51. GRB 070805: Swift detection of a burst
  52. UVOT observations of SAXJ1810.8-2609
  53. Swift detection of a outburst from SAX J1810.8-2609
  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. GRB 070731, Swift-BAT refined analysis
  69. Konus-A observation of GRB 070729
  70. Swift/UVOT detection of GRB070714B
  71. AGILE-ACS position for the SGR 1806-20 July 27 burst
  72. GRB 070724B: pseudo-z ~ 1.10 from prompt emission spectrum
  73. GRB 070729: LCO optical imaging
  74. VLA upper limit on short hard burst GRB 070714B
  75. Intense burst from SGR 1806-20 detected on July 27
  76. GRB070729: Swift/UVOT upper limits
  77. GRB 070729: Swift-XRT refined analysis
  78. GRB 070729, Swift-BAT refined analysis
  79. GRB 070729: Magellan NIR Observations
  80. GRB 070724B: P60 Observations
  81. GRB 070729: Swift detection of a short hard burst
  82. GRB 070724B: Swift/UVOT Upper limits
  83. GRB070721A: Swift/UVOT Detection of a Weak Afterglow
  84. GRB 070724B: Swift-XRT afterglow likely candidate
  85. GRB 070721A: optical observations
  86. GRB 070724A: further VLT observations
  87. GRB 070724B: Suzaku WAM observation of the prompt emission
  88. Konus-Wind observation of GRB 070724B
  89. GRB 070724B: Analysis of AGILE gamma-ray data
  90. GRB 070724B: Swift-XRT afterglow candidates
  91. GRB 070724b: First Gamma Ray Burst Localization by SuperAGILE onboard
  92. Four radio sources in Swift-XRT error box of GRB 070724
  93. GRB 070724: optical observations
  94. GRB070724: Host galaxy redshift
  95. GRB 070724: P60 and Gemini Observations
  96. GRB 060814 - Keck host detection and redshift
  97. GRB 070724: IR observations
  98. GRB 070724: Closer association with DSS source
  99. Swift/UVOT refined analysis of GRB070724
  100. GRB 070724: Swift-XRT Team refined analysis

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