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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"

28116 results found.

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

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