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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.

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subject:"Swift"
body:"GRB"
submitter:"Judith Racusin"

36154 results found.

  1. IPN triangulation of GRB031014 (annulus)
  2. SGR1806-20 bursts on 031008. Helicon detection and small error box.
  3. IPN triangulation of GRB031008 (annulus)
  4. IPN detection of continued activity from SGR1806-20
  5. IPN triangulation of GRB031007 (two large error boxes)
  6. XRF 030723: Subaru Optical Observations
  7. IPN triangulation of GRB031004B (annulus)
  8. IPN triangulation of GRB031004A (short/hard; annulus)
  9. IPN triangulation of GRB030929 (short/hard; annulus)
  10. XRF 030824: Early follow-up observation at Kiso observatory
  11. XRF 030824: observations at CFHT
  12. IPN triangulation of GRB030926 (short/hard; large error box)
  13. IPN triangulation of GRB030922B (large error box)
  14. IPN triangulation of GRB030922A (large error box)
  15. IPN triangulation of GRB030921 (large error box)
  16. IPN triangulation of GRB030919 (large error box)
  17. GRB030922 triangulation (annulus)
  18. GRB030913: Subaru Optical Observations
  19. GRB 030913: ROTSE-3c Optical Observations
  20. GRB030913: OT's limit by MASTER
  21. GRB030921 triangulation (annulus)
  22. GRB030913, candidate afterglow observations
  23. GRB 030913, optical candidate
  24. GRB 030913, BOOTES observations
  25. IPN triangulation of GRB030916 (possible short/hard GRB; large error box)
  26. GRB030913 (=H2849): TAROT Observations
  27. GRB030913: wide field imaging (7 sq.deg) of the error box by MASTER
  28. Magellan Observations of GRB030725 (=H2779)
  29. GRB030913 (=H2849): A GRB Possibly Localized by HETE
  30. IPN triangulation of GRB030908 (annulus)
  31. GRB 030913: Optical limit at RIKEN
  32. XRF030824: Optical observations
  33. IPN triangulation of GRB030903 (large error box)
  34. IPN triangulation of GRB030831 (annulus)
  35. IPN triangulation of GRB030830 (large error box)
  36. GRB 030824: Candidate Follow-Up
  37. IPN triangulation of GRB030827 (large error box)
  38. GRB 030823 observation at Ouda
  39. XRF030824: Second-epoch Palomar observations
  40. IPN triangulation of GRB030822 (annulus)
  41. GRB030823: Palomar observations
  42. XRF030824: Palomar observations
  43. GRB 030824: Candidate Afterglow (or Variable/Flare Star?)
  44. IPN triangulation of GRB030821 (=H2814; refined error box)
  45. GRB 030821(=H2814): A Faint, Long GRB Localized by the HETE WXM and the IPN
  46. Summary of recent IPN and HETE detections of SGR bursts
  47. IPN triangulation of GRB030814 (annulus)
  48. IPN detection of continued activity from SGR1806-20
  49. 030813 SGR event (Konus-Wind observation)
  50. GRB 030817 = H2808 TAROT optical observations
  51. SGR 1808-20 (=H2802): A Possible new SGR
  52. GRB 021206 Optical Observations
  53. IPN triangulation of GRB030808 (two large error boxes)
  54. IPN triangulation of GRB030806 (large burst; large error box)
  55. XRF030723(=H2777): Chandra Fading X-ray Afterglow Confirmed
  56. IPN/HETE summary of recent bursts from SGR1806-20
  57. XRF 030723: Detection of a rebrightening in the optical afterglow
  58. GRB030725: Optical observations
  59. XRF030723, BVRcIc field photometry update
  60. IPN triangulation of GRB030801 (large error box)
  61. GRB021206 optical counterpart upper limit
  62. IPN triangulation of GRB030731 (annulus)
  63. IBAS GRB Alerts 1011-1017 NOT CONFIRMED
  64. IPN triangulation of GRB030725 (=H2779; small error box)
  65. XRF030723 (=H2777): Second Epoch Magellan Observations
  66. GRB 030725: optical observations.
  67. GRB030725, optical transient observations
  68. IPN triangulation of GRB030726 (large error box)
  69. IPN triangulation of GRB030722 (large error box)
  70. IPN triangulation of GRB030721 (large error box)
  71. XRF030723 Radio Observations
  72. XRF030723(=H2777): Chandra Observations
  73. Magellan Observations of XRF030723 (=H2777)
  74. GRB030723: Upper limits from historical observations
  75. GRB030725, possible optical transient
  76. XRF030723: Palomar observations and proposed counterpart
  77. GRB030725 (=H2779): A Bright GRB Localized by HETE
  78. XRF030723: optical observations
  79. XRF030723 (= H2777): Chandra Observations Scheduled
  80. XRF030723, BVRcIc field photometry
  81. XRF030723, optical observations
  82. GRB030723, optical observations
  83. IBAS GRB Alerts 969 970
  84. IPN triangulation of GRB030717 (annulus)
  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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