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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"
  1. GRB020813(=H2262): Revised Localization with HETE SXC
  2. GRB 020812: optical observation at Bisei
  3. GRB020813: Early Time Magnitude
  4. GRB020813: optical observations; possible host galaxy
  5. GRB 020813, radio detection
  6. GRB 020812 : optical afterglow candidate
  7. GRB020813, optical observations
  8. Millimeter observation of GRB 020813
  9. GRB020812: optical observations
  10. GRB 020813 : KISO multiband optical observations
  11. GRB020813, optical observations
  12. IPN error box for GRB020813
  13. IPN triangulation of GRB020813
  14. GRB020812: possible afterglow candidate
  15. Early Time Limits for GRB020813
  16. GRB020812: possible afterglow candidate
  17. GRB020813, astrometric position
  18. Spectropolarimetry of GRB 020813
  19. GRB 020813 Afterglow Observations; Possible break
  20. GRB 020813: Absorption redshift
  21. GRB 020813 multiband optical observations
  22. GRB020813: optical afterglow
  23. GRB020813: Fading of Candidate OT
  24. GRB020813(=H2262): A Long, Bright Burst Localized by HETE in Near-Real Time
  25. GRB020813: Candidate Optical Afterglow
  26. GRB 020812 optical observation
  27. GRB020812(=H2257): A Long Burst Localized by HETE in Near-Real Time
  28. GRB 020715, optical observations
  29. GRB 020714, optical observations
  30. GRB020801: Imaging of Suggested OT Counterpart at the Magellan
  31. GRB020801: Candidate OT present in DSS
  32. HST Imaging of the Host of GRB 011121
  33. GRB020801, optical afterglow candidate
  34. Further refinement to IPN error box for GRB020531
  35. GRB020331: Late-time Optical Light Curve (re-submission)
  36. GRB020331: Late-time Optical Light Curve
  37. GRB 020405: HST observations reveal red bump
  38. IPN triangulation of GRB020714
  39. IPN triangulation of GRB020715 (=GRB150702)
  40. IPN triangulation of GRB020714
  41. IPN triangulation of GRB150702
  42. GRB 020410: Discovery of Probable OT by HST
  43. GRB 020124, HST observations of the fading afterglow
  44. IPN triangulation of GRB020708
  45. IPN triangulation of GRB020708
  46. IPN error box for GRB020706
  47. Correction to IPN error box for GRB020706
  48. IPN triangulation of GRB020706
  49. GRB 020705: Optical observations
  50. GRB 020625, optical observations
  51. GRB 020625: Optical observations
  52. GRB 020531: optical photometry of Chandra sources
  53. GRB020625 (=H2081): A Long Burst Localized by HETE
  54. HETE #2081: Optical observations
  55. The Probable Host Galaxy of GRB/XRF 020427
  56. GRB/XRF 020427, detection of an underlying system with the VLT
  57. Gemini IR Detection of AXP 1E 2259+586 Post-Burst
  58. SGR-like X-ray Bursts from AXP 1E 2259+586: follow-up
  59. AXP 1E2259+586: quasi-simultaneous optical observation
  60. AXP 1E2259+586 optical observations
  61. Fading Optical Source in the Field of GRB020531
  62. GRB 020531, INT+WFC deep optical upper limits
  63. SGR-like Bursts from the AXP 1E 2259+586
  64. GRB020405: polarimetric observations
  65. GRB 020531, simultaneous optical observations
  66. GRB 020604, optical observations
  67. GRB 020531/Candidate Redshift
  68. GRB020531: Detection of Candidate Host Galaxy
  69. GRB020531: Second epoch Chandra observations
  70. GRB020604, optical observations
  71. GRB020604, BVRcIc field photometry
  72. GRB020603, BVRcIc field observations
  73. GRB020531, BVRcIc field photometry
  74. GRB020531 Optical observations with TAROT
  75. GRB020531 Optical observations with TAROT
  76. GRB 020418, optical/near-IR observations
  77. GRB 020531, Radio Observations
  78. IPN triangulation of GRB020604
  79. GRB020531 Optical Observations
  80. GRB020531: Observations with the Chandra X-ray Observatory
  81. GRB 020603: Optical Observations
  82. GRB 020603, R-band observation
  83. Correction to IPN triangulation of GRB020603 (possible short/hard burst)
  84. GRB020531: Upper Limit for Detection of Two TAROT Sources
  85. GRB 020603: Optical observations
  86. IPN triangulation of GRB020603 (possible short/hard GRB)
  87. GRB 020531 optical observations with TAROT
  88. Refined IPN error box for GRB020531
  89. GRB020531, optical observations
  90. GRB020531: optical observations
  91. GRB020531, optical observation
  92. GRB020531(=H2042): Optical Observations
  93. IPN triangulation of the short, hard GRB020531 (=H2042)
  94. GRB020531(=H2042): Optical Observations
  95. GRB020531: Optical observations
  96. GRB020531(=H2042): A Short, Hard Burst Localized by HETE
  97. GRB 020525: Optical Observations
  98. GRB020525, optical observations
  99. IPN detection of possible bursts from SGR1806-20
  100. IPN triangulation of GRB020525

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