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

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