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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"

19309 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. GRB070808 - SDSS Pre-Burst Observations
  6. GRB070612A: Radio upper limit from GMRT
  7. GRB 070721B: correct afterglow position
  8. GRB 070805, Swift-BAT refined analysis
  9. GRB 070802: Swift-XRT refined analysis
  10. GRB 070802, Swift-BAT refined analysis
  11. GRB 070802: GROND J band candidate
  12. GRB 070731, Swift-BAT refined analysis
  13. Konus-A observation of GRB 070729
  14. Intense burst from SGR 1806-20 detected on July 27
  15. GRB 070729: Swift-XRT refined analysis
  16. GRB 070729, Swift-BAT refined analysis
  17. GRB 070724B: Swift/UVOT Upper limits
  18. GRB 070724B: Swift-XRT afterglow likely candidate
  19. GRB 070724B: Suzaku WAM observation of the prompt emission
  20. GRB 070724B: Swift-XRT afterglow candidates
  21. Four radio sources in Swift-XRT error box of GRB 070724
  22. GRB 060814 - Keck host detection and redshift
  23. GRB 070724: Swift-XRT Team refined analysis
  24. GRB 070724, Swift-BAT refined analysis of a short burst
  25. GRB 070721B: further observations and analysis
  26. GRB 070326: Detection of first burst from BAT Slew Survey (BATSS)
  27. GRB 070714B: Keck observations
  28. GRB 070721B: optical observations and proposed redshift
  29. GRB 070721B, Further Swift-BAT refined analysis
  30. GRB 070721B: Swift-XRT refined analysis
  31. GRB 070721A: Swift/XRT refined analysis
  32. GRB 070721B, Swift-BAT refined analysis
  33. GRB 070721A, Swift-BAT refined analysis
  34. GRB070721B: A bright UVOT candidate
  35. GRB 070714B: Swift/BAT and Suzaku/WAM joint spectral analysis
  36. GRB 070714B : Suzaku WAM observation of the prompt emission
  37. Erratum : Suzaku WAM observation of GRB 070704
  38. GRB 070714B: Swift-BAT spectral lag for the SHB
  39. GRB 070714A: Swift XRT refined analysis
  40. GRB070714B: Swift-XRT refined analysis
  41. GRB 070707: Swift-XRT follow-up observations
  42. GRB 070714B, Swift-BAT refined analysis of the short hard burst
  43. GRB 070714A, Swift-BAT refined analysis
  44. SN 2007bg - off-axis GRB?
  45. GRB 070704: Suzaku/WAM observation of the prompt emission
  46. Konus-Wind observation of GRB 070707
  47. Swift XRT observation of GRB 070707
  48. GRB 070707: A long GRB detected by INTEGRAL
  49. GRB 070707: A long GRB detected by INTEGRAL
  50. GRB 070611: VLT observations
  51. GRB 070704: Swift-XRT refined analysis
  52. GRB 070704, Swift-BAT refined analysis
  53. GRB 070626: Suzaku/WAM observation of the prompt emission
  54. GRB 070628, Swift-BAT refined analysis
  55. Swift UVOT Observations of GRB 070628
  56. OT20050728 was not an optical GRB afterglow
  57. GRB 070616 : WIDGET simultaneous optical observations
  58. GRB 070616: Suzaku/WAM observation of the prompt emission
  59. Keck Laser Guide Star Adaptive Optics Imaging of GRB 070621
  60. GRB 070621: Swift-BAT refined analysis
  61. GRB070621: Swift XRT refined analysis
  62. GRB070621: OPTIMA-Burst optical upper limit
  63. Swift/UVOT detection of GRB070616 optical afterglow.
  64. GRB 070612A: NOT observations
  65. GRB070616: Optical Observation by MITSuME Okayama
  66. GRB 070616, Swift-BAT further refined analysis
  67. GRB 070616: BTA optical observations
  68. Swift XRT observations of the INTEGRAL burst GRB070615: Possible
  69. GRB 070616: Swift detection of a burst
  70. VLA upper limit on GRB 070610
  71. GRB 070612A: Suzaku/WAM observation of the prompt emission
  72. SWIFT J195509.6+261406 / GRB 070610: OPTIMA-Burst observations
  73. GRB070612A: MITSuME Okayama Observation
  74. Swift Trigger 282176 is Cygnus X-1
  75. GRB 070612A: P60 Confirmation of Afterglow and An Underlying, Nearby
  76. GRB 070612B, Swift-BAT refined analysis
  77. GRB 070612A, Swift-BAT refined analysis
  78. SWIFT J195509.6+261406 / GRB 070610: SWIFT continued observations
  79. GRB070612B: P60 Observations
  80. GRB 070612A: SARA detection of possible OT
  81. GRB 070610: MITSuME OAO optical upper limit
  82. GRB070612 - SDSS Pre-Burst Observations
  83. GRB 070612: Swift detection of a burst
  84. GRB 070610: OPTIMA-Burst detection of continued strong flaring activity
  85. GRB 070610: Swift-XRT refined analysis
  86. GRB 070611: Swift-XRT refined analysis
  87. GRB 070611, Swift-BAT refined analysis
  88. GRB 070611: ROTSE-III Detection of Late Rising Optical Counterpart
  89. GRB 070610: Swift-UVOT Upper Limits
  90. GRB 070610: OPTIMA-Burst high-time-resolution optical observations
  91. GRB 070610, Swift-BAT refined analysis
  92. GRB070520B: optical observations
  93. GRB070520: optical observation
  94. GRB070518: optical observation
  95. GRB070521: optical observation
  96. GRB 070531: Swift-BAT refined analysis
  97. Swift/UVOT refined analysis of GRB070529
  98. GRB 070529: Swift-XRT refined analysis
  99. GRB 070529, Swift-BAT refined analysis
  100. GRB 070412: Deep Keck imaging

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