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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"

38405 results found.

  1. IPN triangulation of GRB030919 (large error box)
  2. GRB030922 triangulation (annulus)
  3. GRB030913: Subaru Optical Observations
  4. GRB 030913: ROTSE-3c Optical Observations
  5. GRB030913: OT's limit by MASTER
  6. GRB030921 triangulation (annulus)
  7. GRB030913, candidate afterglow observations
  8. GRB 030913, optical candidate
  9. GRB030913: AAVSO optical observations
  10. GRB 030913, BOOTES observations
  11. GRB030913 (=H2849): Confirmation of the Flight Localization
  12. IPN triangulation of GRB030916 (possible short/hard GRB; large error box)
  13. GRB030913 (=H2849): TAROT Observations
  14. Magellan Observations of GRB030725 (=H2779)
  15. GRB030913 (=H2849): A GRB Possibly Localized by HETE
  16. IPN triangulation of GRB030908 (annulus)
  17. XRF 020427: Gemini-South Spectroscopic Observations of the Host
  18. XRF030824: Optical observations
  19. IPN triangulation of GRB030903 (large error box)
  20. IBAS detection of bursts from SGR 1806-20
  21. Radio Observations of SGR1806-20
  22. IPN triangulation of GRB030831 (annulus)
  23. IPN triangulation of GRB030830 (large error box)
  24. INTEGRAL ToO OBSERVATIONS OF SGR1806-20: CALL FOR CORRELATED OBSERVATIONS
  25. IPN triangulation of GRB030827 (large error box)
  26. XRF030824: Second-epoch Palomar observations
  27. XRF030824: optical observations
  28. IPN triangulation of GRB030822 (annulus)
  29. GRB030823: Palomar observations
  30. XRF030824: Palomar observations
  31. GRB 030824: Candidate Afterglow (or Variable/Flare Star?)
  32. GRB030823: optical observation at Tokyo Tech
  33. RAPTOR observations of GRB030823
  34. IPN triangulation of GRB030821 (=H2814; refined error box)
  35. GRB 030821(=H2814): A Faint, Long GRB Localized by the HETE WXM and the IPN
  36. Summary of recent IPN and HETE detections of SGR bursts
  37. IPN triangulation of GRB030814 (annulus)
  38. Clarification of GCN 2354 on SGR1806-20
  39. IPN detection of continued activity from SGR1806-20
  40. 030813 SGR event (Konus-Wind observation)
  41. GRB 030817 = H2808 TAROT optical observations
  42. SGR 1808-20 (=H2802): A Possible new SGR
  43. GRB 021206 Optical Observations
  44. IPN triangulation of GRB030808 (two large error boxes)
  45. IPN triangulation of GRB030806 (large burst; large error box)
  46. XRF030723(=H2777): Chandra Fading X-ray Afterglow Confirmed
  47. IPN/HETE summary of recent bursts from SGR1806-20
  48. XRF 030723: Detection of a rebrightening in the optical afterglow
  49. XRF030723, BVRcIc field photometry update
  50. IPN triangulation of GRB030801 (large error box)
  51. GRB021206 optical counterpart upper limit
  52. IPN triangulation of GRB030731 (annulus)
  53. IBAS GRB Alerts 1011-1017 NOT CONFIRMED
  54. XRF030723: Re-analysis of ROTSE-III early images
  55. IPN triangulation of GRB030725 (=H2779; small error box)
  56. XRF030723 (=H2777): Second Epoch Magellan Observations
  57. GRB 030725: optical observations.
  58. GRB030725, optical transient observations
  59. IPN triangulation of GRB030726 (large error box)
  60. IPN triangulation of GRB030722 (large error box)
  61. IPN triangulation of GRB030721 (large error box)
  62. XRF030723 Radio Observations
  63. XRF 030723: confirmation of fading optical counterpart
  64. XRF030723(=H2777): Chandra Observations
  65. XRF 030723: VLT spectra
  66. Magellan Observations of XRF030723 (=H2777)
  67. GRB030725, possible optical transient
  68. XRF030723: Palomar observations and proposed counterpart
  69. GRB030725 (=H2779): A Bright GRB Localized by HETE
  70. XRF030723: optical observations
  71. XRF030723 (= H2777): Chandra Observations Scheduled
  72. XRF030723, ROTSE-III Early Observations
  73. XRF030723, BVRcIc field photometry
  74. XRF 030723, optical observations
  75. XRF030723, optical observations
  76. XRF 030723, optical observations
  77. XRF030723 (=H2777): An X-ray Flash Localized by the HETE WXM and
  78. GRB030723, optical observations
  79. Konus-Wind detection of the bursts from SGR1806-20 region
  80. IBAS GRB Alerts 969 970
  81. SGR 1806-20, submm observations
  82. H2768, H2770, and H2771: Three Bursts from SGR1806-20
  83. IPN triangulation of GRB030717 (annulus)
  84. RXTE PCA Observations of SGR1806-20 Region
  85. GRB030329: Subaru Optical Spectroscopy
  86. Triangulation of GRB030715 (single large error box)
  87. Triangulation of GRB030714 (single large error box)
  88. 030716 NOT a GRB
  89. IPN triangulation of GRB030714 (two large error boxes)
  90. IPN triangulation of GRB030715 (two large error boxes)
  91. GRB030329: RTT150 optical observations
  92. GRBlog: Compilation of all GCN Circ. data
  93. IPN detection of renewed activity from SGR1806-20
  94. IPN triangulation of GRB030711 (annulus, =SGR0525-66?)
  95. IPN triangulation of GRB030710 (annulus)
  96. IPN triangulation of GRB030709 (annulus)
  97. GRB030706 triangulation (single large error box)
  98. IPN triangulation of GRB030706 (annulus)
  99. IPN triangulation of GRB030629 (annulus)
  100. GRB030629 triangulation (Konus-Wind -- Helicon annulus)

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