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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"

37166 results found.

  1. RAPTOR observations of GRB030823
  2. IPN triangulation of GRB030821 (=H2814; refined error box)
  3. GRB 030821(=H2814): A Faint, Long GRB Localized by the HETE WXM and the IPN
  4. Summary of recent IPN and HETE detections of SGR bursts
  5. IPN triangulation of GRB030814 (annulus)
  6. IPN detection of continued activity from SGR1806-20
  7. 030813 SGR event (Konus-Wind observation)
  8. GRB 030817 = H2808 TAROT optical observations
  9. SGR 1808-20 (=H2802): A Possible new SGR
  10. GRB 021206 Optical Observations
  11. IPN triangulation of GRB030808 (two large error boxes)
  12. IPN triangulation of GRB030806 (large burst; large error box)
  13. XRF030723(=H2777): Chandra Fading X-ray Afterglow Confirmed
  14. IPN/HETE summary of recent bursts from SGR1806-20
  15. XRF 030723: Detection of a rebrightening in the optical afterglow
  16. GRB030725: Optical observations
  17. XRF030723, BVRcIc field photometry update
  18. IPN triangulation of GRB030801 (large error box)
  19. GRB021206 optical counterpart upper limit
  20. IPN triangulation of GRB030731 (annulus)
  21. IBAS GRB Alerts 1011-1017 NOT CONFIRMED
  22. XRF030723: Re-analysis of ROTSE-III early images
  23. IPN triangulation of GRB030725 (=H2779; small error box)
  24. XRF030723 (=H2777): Second Epoch Magellan Observations
  25. GRB 030725: optical observations.
  26. GRB030725, optical transient observations
  27. IPN triangulation of GRB030726 (large error box)
  28. IPN triangulation of GRB030722 (large error box)
  29. IPN triangulation of GRB030721 (large error box)
  30. XRF030723 Radio Observations
  31. XRF030723(=H2777): Chandra Observations
  32. Magellan Observations of XRF030723 (=H2777)
  33. GRB030723: Upper limits from historical observations
  34. GRB030725, possible optical transient
  35. XRF030723: Palomar observations and proposed counterpart
  36. GRB030725 (=H2779): A Bright GRB Localized by HETE
  37. XRF030723: optical observations
  38. XRF030723 (= H2777): Chandra Observations Scheduled
  39. XRF030723, ROTSE-III Early Observations
  40. XRF030723, BVRcIc field photometry
  41. XRF030723, optical observations
  42. GRB030723, optical observations
  43. IBAS GRB Alerts 969 970
  44. IPN triangulation of GRB030717 (annulus)
  45. GRB030329: Subaru Optical Spectroscopy
  46. Triangulation of GRB030715 (single large error box)
  47. Triangulation of GRB030714 (single large error box)
  48. 030716 NOT a GRB
  49. IPN triangulation of GRB030714 (two large error boxes)
  50. IPN triangulation of GRB030715 (two large error boxes)
  51. GRB030329: RTT150 optical observations
  52. GRBlog: Compilation of all GCN Circ. data
  53. IPN detection of renewed activity from SGR1806-20
  54. IPN triangulation of GRB030711 (annulus, =SGR0525-66?)
  55. IPN triangulation of GRB030710 (annulus)
  56. IPN triangulation of GRB030709 (annulus)
  57. GRB030706 triangulation (single large error box)
  58. IPN triangulation of GRB030706 (annulus)
  59. IPN triangulation of GRB030629 (annulus)
  60. GRB030629 triangulation (Konus-Wind -- Helicon annulus)
  61. 030629 NOT a real GRB
  62. IPN triangulation of GRB030626 (single large error box)
  63. IPN triangulation of GRB030626 (two large error boxes)
  64. GRB030418: R optical observations
  65. GRB030329 -- RATAN-600 data in April-May
  66. Final IPN error ellipse for GRB021206 (the polarized GRB)
  67. GRB 021206, Radio afterglow candidate
  68. GRB030528(=H2724): X-ray Afterglow Identified in Second Epoch
  69. IPN triangulation of GRB030607 (annulus)
  70. IPN triangulation of GRB030606 (two alternate error boxes)
  71. GRB 030528: Infrared Observations and the Proposed IR Counterpart
  72. IPN triangulation of GRB030605B (annulus)
  73. GRB 030528: Optical Observations
  74. IPN triangulation of GRB030605 (annulus)
  75. GRB 030528: tentative NIR counterpart
  76. GRB 030528, radio observations
  77. GRB030528(=H2724): Observations with the Chandra X-ray Observatory
  78. GRB030329, further radio observations at GMRT
  79. GRB030528, BVRI field photometry
  80. IPN triangulation of GRB030601 (annulus)
  81. GRB030528: Chandra TOO Planned
  82. GRB 030519B: optical observations.
  83. MASTER: optical observation GRB030601
  84. GRB 030329: optical observations
  85. GRB 030329/SN 2003dh: Jitter Episode
  86. GRB 030528, Teramo optical observation
  87. GRB 030528 Bisei optical observation
  88. GRB030528 (H2724): A long GRB localized by HETE
  89. GRB 030329: Correction to GCN 2254
  90. GRB 030329: Optical Observations
  91. GRB 030528: Optical observations at RIKEN
  92. GRB 030528 (=H2724) Kyoto optical observation
  93. IPN triangulation of GRB030523B (annulus)
  94. GRB 030416: Optical Observations
  95. GRB 030329: Planned XMM-Newton Observation
  96. IPN triangulation of GRB030523 (annulus)
  97. GRB 030329: optical photometry at various french observatories
  98. GRB 030329: optical photometry at Belesta observatory (France)
  99. GRB 030329/SN 2003dh: Possible increase in brightness
  100. GRB 030329: HST ACS Observations of the Host

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