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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"

37718 results found.

  1. IPN triangulation of GRB030903 (large error box)
  2. IPN triangulation of GRB030831 (annulus)
  3. IPN triangulation of GRB030830 (large error box)
  4. GRB 030824: Candidate Follow-Up
  5. IPN triangulation of GRB030827 (large error box)
  6. GRB 030823 observation at Ouda
  7. XRF030824: Second-epoch Palomar observations
  8. IPN triangulation of GRB030822 (annulus)
  9. GRB030823: Palomar observations
  10. XRF030824: Palomar observations
  11. GRB 030824: Candidate Afterglow (or Variable/Flare Star?)
  12. IPN triangulation of GRB030821 (=H2814; refined error box)
  13. GRB 030821(=H2814): A Faint, Long GRB Localized by the HETE WXM and the IPN
  14. Summary of recent IPN and HETE detections of SGR bursts
  15. IPN triangulation of GRB030814 (annulus)
  16. IPN detection of continued activity from SGR1806-20
  17. 030813 SGR event (Konus-Wind observation)
  18. GRB 030817 = H2808 TAROT optical observations
  19. SGR 1808-20 (=H2802): A Possible new SGR
  20. GRB 021206 Optical Observations
  21. IPN triangulation of GRB030808 (two large error boxes)
  22. IPN triangulation of GRB030806 (large burst; large error box)
  23. XRF030723(=H2777): Chandra Fading X-ray Afterglow Confirmed
  24. IPN/HETE summary of recent bursts from SGR1806-20
  25. XRF 030723: Detection of a rebrightening in the optical afterglow
  26. GRB030725: Optical observations
  27. XRF030723, BVRcIc field photometry update
  28. IPN triangulation of GRB030801 (large error box)
  29. GRB021206 optical counterpart upper limit
  30. IPN triangulation of GRB030731 (annulus)
  31. IBAS GRB Alerts 1011-1017 NOT CONFIRMED
  32. IPN triangulation of GRB030725 (=H2779; small error box)
  33. XRF030723 (=H2777): Second Epoch Magellan Observations
  34. GRB 030725: optical observations.
  35. GRB030725, optical transient observations
  36. IPN triangulation of GRB030726 (large error box)
  37. IPN triangulation of GRB030722 (large error box)
  38. IPN triangulation of GRB030721 (large error box)
  39. XRF030723 Radio Observations
  40. XRF030723(=H2777): Chandra Observations
  41. Magellan Observations of XRF030723 (=H2777)
  42. GRB030723: Upper limits from historical observations
  43. GRB030725, possible optical transient
  44. XRF030723: Palomar observations and proposed counterpart
  45. GRB030725 (=H2779): A Bright GRB Localized by HETE
  46. XRF030723: optical observations
  47. XRF030723 (= H2777): Chandra Observations Scheduled
  48. XRF030723, BVRcIc field photometry
  49. XRF030723, optical observations
  50. GRB030723, optical observations
  51. IBAS GRB Alerts 969 970
  52. IPN triangulation of GRB030717 (annulus)
  53. GRB030329: Subaru Optical Spectroscopy
  54. Triangulation of GRB030715 (single large error box)
  55. Triangulation of GRB030714 (single large error box)
  56. 030716 NOT a GRB
  57. IPN triangulation of GRB030714 (two large error boxes)
  58. IPN triangulation of GRB030715 (two large error boxes)
  59. GRB030329: RTT150 optical observations
  60. GRBlog: Compilation of all GCN Circ. data
  61. IPN detection of renewed activity from SGR1806-20
  62. IPN triangulation of GRB030711 (annulus, =SGR0525-66?)
  63. IPN triangulation of GRB030710 (annulus)
  64. IPN triangulation of GRB030709 (annulus)
  65. GRB030706 triangulation (single large error box)
  66. IPN triangulation of GRB030706 (annulus)
  67. IPN triangulation of GRB030629 (annulus)
  68. GRB030629 triangulation (Konus-Wind -- Helicon annulus)
  69. 030629 NOT a real GRB
  70. IPN triangulation of GRB030626 (single large error box)
  71. IPN triangulation of GRB030626 (two large error boxes)
  72. GRB030418: R optical observations
  73. GRB030329 -- RATAN-600 data in April-May
  74. Final IPN error ellipse for GRB021206 (the polarized GRB)
  75. GRB 021206, Radio afterglow candidate
  76. GRB030528(=H2724): X-ray Afterglow Identified in Second Epoch
  77. IPN triangulation of GRB030607 (annulus)
  78. IPN triangulation of GRB030606 (two alternate error boxes)
  79. GRB 030528: Infrared Observations and the Proposed IR Counterpart
  80. IPN triangulation of GRB030605B (annulus)
  81. GRB 030528: Optical Observations
  82. IPN triangulation of GRB030605 (annulus)
  83. GRB 030528: tentative NIR counterpart
  84. GRB 030528, radio observations
  85. GRB030528(=H2724): Observations with the Chandra X-ray Observatory
  86. GRB030329, further radio observations at GMRT
  87. GRB030528, BVRI field photometry
  88. IPN triangulation of GRB030601 (annulus)
  89. GRB030528: Chandra TOO Planned
  90. GRB 030519B: optical observations.
  91. GRB 030329: optical observations
  92. GRB 030329/SN 2003dh: Jitter Episode
  93. GRB 030528, Teramo optical observation
  94. GRB 030528 Bisei optical observation
  95. GRB030528 (H2724): A long GRB localized by HETE
  96. GRB 030329: Correction to GCN 2254
  97. GRB 030329: Optical Observations
  98. GRB 030528: Optical observations at RIKEN
  99. GRB 030528 (=H2724) Kyoto optical observation
  100. IPN triangulation of GRB030523B (annulus)

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