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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"

21470 results found.

  1. GCN Swift XRT update position notices and enhanced position circulars
  2. GRB 070808: Swift XRT refined analysis
  3. GRB 070808, Swift-BAT refined analysis
  4. GRB 070808: OPTIMA-Burst optical upper limit
  5. GRB 070808: Xinglong TNT optical Upper Limit
  6. GRB070808 - SDSS Pre-Burst Observations
  7. GRB 070808: ROTSE-III Optical Limits
  8. GRB 070808: Swift detection of a burst
  9. GRB070805 XRT and UVOT afterglow candidate
  10. Swift trigger on 4U 1700-377 while star tracker loss-of-lock
  11. Swift/UVOT observations of GRB070805
  12. GRB 070805, Swift-BAT refined analysis
  13. GRB 070805: Swift XRT initial analysis.
  14. GRB 070805: Swift/UVOT initial analysis
  15. GRB 070805: Swift detection of a burst
  16. UVOT observations of SAXJ1810.8-2609
  17. Swift detection of a outburst from SAX J1810.8-2609
  18. VLA non-detection of GRB 070721B
  19. GRB 070802: REM optical observations
  20. GRB 070724B: Swift-XRT afterglow confirmation
  21. GRB 070802: Swift-XRT refined analysis
  22. GRB070802: Swift/UVOT upper limits
  23. GRB 070802, Swift-BAT refined analysis
  24. GRB 070802: refined Swift XRT position
  25. GRB 070802: V-band detection of the candidate afterglow
  26. GRB 070802: LCO I-band candidate
  27. GRB 070802: GROND J band candidate
  28. GRB 070802: LCO optical observations
  29. GRB 070802: Swift detection of a burst
  30. GRB 070731, Swift-BAT refined analysis
  31. Konus-A observation of GRB 070729
  32. Swift/UVOT detection of GRB070714B
  33. GRB 070729: LCO optical imaging
  34. VLA upper limit on short hard burst GRB 070714B
  35. GRB070729: Swift/UVOT upper limits
  36. GRB 070729: Swift-XRT refined analysis
  37. GRB 070729, Swift-BAT refined analysis
  38. GRB 070729: Magellan NIR Observations
  39. GRB 070724B: P60 Observations
  40. GRB 070729: Swift detection of a short hard burst
  41. GRB 070724B: Swift/UVOT Upper limits
  42. GRB070721A: Swift/UVOT Detection of a Weak Afterglow
  43. GRB 070724B: Swift-XRT afterglow likely candidate
  44. GRB 070721A: optical observations
  45. GRB 070724B: Swift-XRT afterglow candidates
  46. Four radio sources in Swift-XRT error box of GRB 070724
  47. GRB 070724: optical observations
  48. GRB 070724: P60 and Gemini Observations
  49. GRB 060814 - Keck host detection and redshift
  50. GRB 070724: IR observations
  51. GRB 070724: Closer association with DSS source
  52. Swift/UVOT refined analysis of GRB070724
  53. GRB 070724: Swift-XRT Team refined analysis
  54. GRB 070724: Pre-Imaging Shows a Source in the XRT Error Circle
  55. GRB 070724, Swift-BAT refined analysis of a short burst
  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. Swift/UVOT observations of GRB070721B optical afterglow.
  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. GRB 070714A: Swift/UVOT Upper limits
  75. GRB 070714B: Swift/UVOT Upper Limits
  76. GRB 070714B: Swift-BAT spectral lag for the SHB
  77. GRB 070714A: Swift XRT refined analysis
  78. GRB070714B: Swift-XRT refined analysis
  79. GRB 070707: Swift-XRT follow-up observations
  80. GRB 070714B, Swift-BAT refined analysis of the short hard burst
  81. GRB 070714A, Swift-BAT refined analysis
  82. GRB 070714 : Liverpool Telescope optical counterpart ?
  83. GRB 070714: Swift detection of a bright burst, possibly short
  84. Swift detection of a possible burst (Trigger 284850)
  85. GRB 070704: RTT150 optical observations
  86. GRB 070704: Suzaku/WAM observation of the prompt emission
  87. Updated Swift/UVOT calibration
  88. GRB 070707: optical afterglow
  89. GRB 070707: object inside XRT error circle
  90. Swift/UVOT Observations of GRB070707
  91. Swift XRT observation of GRB 070707
  92. GRB 070429B: NIR Observations
  93. GRB070704: FAVOR optical observations
  94. GRB 070704 : Liverpool Telescope Observations
  95. GRB 070611: VLT observations
  96. GRB 070704: Swift-XRT refined analysis
  97. Swift/UVOT Observations of GRB070704
  98. GRB 070704, Swift-BAT refined analysis
  99. GRB 070704: Correction to GCN Circ 6594
  100. GRB 070704: Swift detection of a burst

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