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GCN Circulars

GCN Circulars are rapid astronomical bulletins submitted by and distributed to community members worldwide. They are used to share discoveries, observations, quantitative near-term predictions, requests for follow-up observations, or future observing plans related to high-energy, multi-messenger, and variable or transient astrophysical events. 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"

868 results found.

  1. IPN Localization of GRB 070821 (long, very bright)
  2. GRB 070621: Swift-BAT refined analysis
  3. GRB 070520A, Swift-BAT refined analysis
  4. GRB 070517: Swift detection of a burst
  5. GRB 070512: IPN localization and Konus spectrum of a bright burst
  6. IPN triangulation of GRB070402
  7. GRB 070306, Swift-BAT refined analysis
  8. GRB 070220: MITSuME Okayama Optical Observation
  9. IPN-BAT localization of GRB070125 (very long duration, intense)
  10. IPN localization of GRB070124 (short duration, hard spectrum)
  11. Swift/BAT trigger #250033 is due to a known source during loss of
  12. Swift-BAT triggers 238544 and 238546 are not GRBs
  13. GRB 060908: PROMPT Detection of a Bright Counterpart
  14. IPN triangulation of GRB060806 (long, exceptionally bright)
  15. IPN triangulation of GRB060805B
  16. GRB060801: Radio Observations
  17. GRB 060607: Swift-BAT Refined Analysis
  18. GRB 060502B MDM Follow-up Observation
  19. GRB 060429: Refined IPN error box and Konus-Wind spectrum
  20. IPN triangulation of GRB060429 (short/hard)
  21. GRB 060427B: IPN localization of a short hard burst
  22. GRB 060219: Swift/UVOT Upper Limits
  23. GRB 060213: IPN localization
  24. IPN observations of SGR1806-20
  25. IPN triangulation and Konus spectrum of the bright short/hard GRB051103
  26. IPN triangulation of GRB051022 (=H3950)
  27. GRB050826: Swift/UVOT early upper limits
  28. GRB050826: Swift-BAT detection of a long burst
  29. GRB 050713A: XRT refined analysis
  30. GRB 050713A : Swift-BAT Refined Analysis
  31. GRB 050713: Swift detection of Bright Burst
  32. GRB 050306: Possible X-ray Afterglow Position from the Swift
  33. SGR1806-20: Swift-BAT observation of the 041227 super-flare
  34. IPN localization of giant flare from SGR1806-20
  35. GRB 041219: Radio Afterglow Detection
  36. GRB 041218 : Radio Observations
  37. IPN triangulation of GRB040924 (H3564)
  38. IPN/HETE localizations of GRB040810 (=H3489)
  39. IPN/HETE triangulation of GRB040802 (=H3485)
  40. XRF040701: Second-Epoch Chandra Observations
  41. IPN Summary of SGR1806-20 Activity in 2004
  42. IPN triangulation of GRB040425 (=H3183)
  43. IPN triangulation of GRB040228 (H3066, H3067)
  44. IPN triangulation of an intermediate burst from SGR1806-20
  45. IPN triangulation of GRB031219 (large error box)
  46. IPN triangulation of GRB031214 (short/hard; very intense; small error box)
  47. IPN triangulation of GRB031127A and B (quasi-simultaneous; large error boxes)
  48. IPN triangulation of GRB031201 (large error box)
  49. IPN triangulation of GRB031130 (large error box)
  50. IPN/HETE localization of GRB031109 (=H2917; large error box)
  51. IPN detection of activity from SGR1806-20
  52. IPN triangulation of GRB031114 (large error box)
  53. IPN triangulation of GRB031107 (two large error boxes)
  54. IPN triangulation of GRB031108 (large error box)
  55. GRB030929/SN2003jd association unlikely based on IPN localiztion
  56. IPN triangulation of GRB031027 (small error box)
  57. IPN triangulation of GRB031026B (large error box)
  58. IPN triangulation of GRB031024 (single error box)
  59. IPN triangulation of GRB031024 (annulus)
  60. IPN triangulation of GRB031020 (large error box)
  61. IPN triangulation of GRB031004B (annulus)
  62. IPN triangulation of GRB031004A (short/hard; annulus)
  63. IPN triangulation of GRB030926 (short/hard; large error box)
  64. IPN triangulation of GRB030922B (large error box)
  65. IPN triangulation of GRB030921 (large error box)
  66. IPN triangulation of GRB030919 (large error box)
  67. IPN triangulation of GRB030916 (possible short/hard GRB; large error box)
  68. IPN triangulation of GRB030908 (annulus)
  69. IPN triangulation of GRB030903 (large error box)
  70. IPN triangulation of GRB030831 (annulus)
  71. IPN triangulation of GRB030827 (large error box)
  72. IPN triangulation of GRB030821 (=H2814; refined error box)
  73. GRB 030821(=H2814): A Faint, Long GRB Localized by the HETE WXM and the IPN
  74. Summary of recent IPN and HETE detections of SGR bursts
  75. IPN triangulation of GRB030814 (annulus)
  76. IPN detection of continued activity from SGR1806-20
  77. SGR 1808-20 (=H2802): A Possible new SGR
  78. IPN triangulation of GRB030806 (large burst; large error box)
  79. IPN triangulation of GRB030801 (large error box)
  80. IPN triangulation of GRB030725 (=H2779; small error box)
  81. IPN triangulation of GRB030726 (large error box)
  82. IPN triangulation of GRB030721 (large error box)
  83. IPN triangulation of GRB030714 (two large error boxes)
  84. IPN triangulation of GRB030715 (two large error boxes)
  85. IPN triangulation of GRB030711 (annulus, =SGR0525-66?)
  86. IPN triangulation of GRB030626 (single large error box)
  87. IPN triangulation of GRB030626 (two large error boxes)
  88. Final IPN error ellipse for GRB021206 (the polarized GRB)
  89. IPN triangulation of GRB030606 (two alternate error boxes)
  90. MASTER: optical observation GRB030601
  91. IPN triangulation of GRB030509 (small errror box)
  92. IPN triangulation of GRB030505B (large error box)
  93. GRB 030329: all-sky CCD images by K. Shiokawa immediately after the burst
  94. IPN triangulation of GRB030425 (single error box)
  95. IPN triangulation of GRB030422 (two large error boxes)
  96. IPN triangulation of GRB030414 (small error box)
  97. IPN triangulation of GRB030413 (small error box)
  98. IPN triangulation of GRB030406 (small error box)
  99. IPN triangulation of GRB050403 (small error box)
  100. Kiso observation of the GRB030329 at April 6

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