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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"

37161 results found.

  1. IPN detection of continued activity from SGR1806-20
  2. 030813 SGR event (Konus-Wind observation)
  3. GRB 030817 = H2808 TAROT optical observations
  4. SGR 1808-20 (=H2802): A Possible new SGR
  5. GRB 021206 Optical Observations
  6. IPN triangulation of GRB030808 (two large error boxes)
  7. IPN triangulation of GRB030806 (large burst; large error box)
  8. XRF030723(=H2777): Chandra Fading X-ray Afterglow Confirmed
  9. IPN/HETE summary of recent bursts from SGR1806-20
  10. XRF 030723: Detection of a rebrightening in the optical afterglow
  11. GRB030725: Optical observations
  12. XRF030723, BVRcIc field photometry update
  13. IPN triangulation of GRB030801 (large error box)
  14. GRB021206 optical counterpart upper limit
  15. IPN triangulation of GRB030731 (annulus)
  16. IBAS GRB Alerts 1011-1017 NOT CONFIRMED
  17. XRF030723: Re-analysis of ROTSE-III early images
  18. IPN triangulation of GRB030725 (=H2779; small error box)
  19. XRF030723 (=H2777): Second Epoch Magellan Observations
  20. GRB 030725: optical observations.
  21. GRB030725, optical transient observations
  22. IPN triangulation of GRB030726 (large error box)
  23. IPN triangulation of GRB030722 (large error box)
  24. IPN triangulation of GRB030721 (large error box)
  25. XRF030723 Radio Observations
  26. XRF030723(=H2777): Chandra Observations
  27. Magellan Observations of XRF030723 (=H2777)
  28. GRB030723: Upper limits from historical observations
  29. GRB030725, possible optical transient
  30. XRF030723: Palomar observations and proposed counterpart
  31. GRB030725 (=H2779): A Bright GRB Localized by HETE
  32. XRF030723: optical observations
  33. XRF030723 (= H2777): Chandra Observations Scheduled
  34. XRF030723, ROTSE-III Early Observations
  35. XRF030723, BVRcIc field photometry
  36. XRF030723, optical observations
  37. GRB030723, optical observations
  38. IBAS GRB Alerts 969 970
  39. IPN triangulation of GRB030717 (annulus)
  40. GRB030329: Subaru Optical Spectroscopy
  41. Triangulation of GRB030715 (single large error box)
  42. Triangulation of GRB030714 (single large error box)
  43. 030716 NOT a GRB
  44. IPN triangulation of GRB030714 (two large error boxes)
  45. IPN triangulation of GRB030715 (two large error boxes)
  46. GRB030329: RTT150 optical observations
  47. GRBlog: Compilation of all GCN Circ. data
  48. IPN detection of renewed activity from SGR1806-20
  49. IPN triangulation of GRB030711 (annulus, =SGR0525-66?)
  50. IPN triangulation of GRB030710 (annulus)
  51. IPN triangulation of GRB030709 (annulus)
  52. GRB030706 triangulation (single large error box)
  53. IPN triangulation of GRB030706 (annulus)
  54. IPN triangulation of GRB030629 (annulus)
  55. GRB030629 triangulation (Konus-Wind -- Helicon annulus)
  56. 030629 NOT a real GRB
  57. IPN triangulation of GRB030626 (single large error box)
  58. IPN triangulation of GRB030626 (two large error boxes)
  59. GRB030418: R optical observations
  60. GRB030329 -- RATAN-600 data in April-May
  61. Final IPN error ellipse for GRB021206 (the polarized GRB)
  62. GRB 021206, Radio afterglow candidate
  63. GRB030528(=H2724): X-ray Afterglow Identified in Second Epoch
  64. IPN triangulation of GRB030607 (annulus)
  65. IPN triangulation of GRB030606 (two alternate error boxes)
  66. GRB 030528: Infrared Observations and the Proposed IR Counterpart
  67. IPN triangulation of GRB030605B (annulus)
  68. GRB 030528: Optical Observations
  69. IPN triangulation of GRB030605 (annulus)
  70. GRB 030528: tentative NIR counterpart
  71. GRB 030528, radio observations
  72. GRB030528(=H2724): Observations with the Chandra X-ray Observatory
  73. GRB030329, further radio observations at GMRT
  74. GRB030528, BVRI field photometry
  75. IPN triangulation of GRB030601 (annulus)
  76. GRB030528: Chandra TOO Planned
  77. GRB 030519B: optical observations.
  78. MASTER: optical observation GRB030601
  79. GRB 030329: optical observations
  80. GRB 030329/SN 2003dh: Jitter Episode
  81. GRB 030528, Teramo optical observation
  82. GRB 030528 Bisei optical observation
  83. GRB030528 (H2724): A long GRB localized by HETE
  84. GRB 030329: Correction to GCN 2254
  85. GRB 030329: Optical Observations
  86. GRB 030528: Optical observations at RIKEN
  87. GRB 030528 (=H2724) Kyoto optical observation
  88. IPN triangulation of GRB030523B (annulus)
  89. GRB 030416: Optical Observations
  90. GRB 030329: Planned XMM-Newton Observation
  91. IPN triangulation of GRB030523 (annulus)
  92. GRB 030329: optical photometry at various french observatories
  93. GRB 030329: optical photometry at Belesta observatory (France)
  94. GRB 030329/SN 2003dh: Possible increase in brightness
  95. GRB 030329: HST ACS Observations of the Host
  96. GRB 030329 Optical Observations
  97. GRB 021004: HST observations
  98. GRB030324: Further Observations of the Candidate Optical Afterglow
  99. IPN triangulation of GRB030519B=H2716 (small error box)
  100. GRB 030418: Second Epoch Optical Observations with Magellan

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