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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"

41702 results found.

  1. GRB020812: optical observation
  2. GRB020819(=H2275): Revised Localization with HETE Soft X-ray
  3. GRB020813: High-resolution optical spectroscopy
  4. GRB020819: optical observations at Bisei
  5. GRB020812: negative optical observations
  6. GRB 020812: optical observation at Kyoto University
  7. Second epoch K band imaging of GRB 020819
  8. GRB020813, Baade 6.5m data now available
  9. GRB 020813 : HST observations
  10. Confirming no variability for GRB02081
  11. GRB020819 : Optical observations at KISO
  12. GRB 020812: early time optical observation at Ouda Station
  13. GRB020813: VRI Decay Slopes
  14. GRB020813: Magellan BVRI Photometry
  15. GRB 020819 : OT candidate - confirmation of non variability
  16. GRB 020819: Optical observations
  17. K band observation of GRB 020819
  18. GRB020819: optical observations
  19. IPN triangulation of GRB020819 (HETE 2275)
  20. HETE 2275: Optical observations
  21. GRB020813: optical and NIR observations
  22. GRB020813: Fading X-ray Afterglow Observed with Chandra
  23. GRB020813, UBVRI field calibration
  24. GRB020813: optical observations at Bisei
  25. GRB020813: V-band decay slope
  26. GRB020812: NIR observations
  27. Polarimetry of GRB020813: evidence for variability
  28. GRB020813 IRAM millimeter observations
  29. GRB020812: optical observations
  30. GRB020813: High-Resolution Optical Observations
  31. GRB020813(=H2262): Revised Localization with HETE SXC
  32. GRB 020812: optical observation at Bisei
  33. GRB020813: Early Time Magnitude
  34. GRB020813: optical observations; possible host galaxy
  35. GRB 020813, radio detection
  36. GRB 020812 : optical afterglow candidate
  37. GRB020813, optical observations
  38. Millimeter observation of GRB 020813
  39. GRB020812: optical observations
  40. GRB 020813 : KISO multiband optical observations
  41. GRB020813, optical observations
  42. IPN error box for GRB020813
  43. IPN triangulation of GRB020813
  44. GRB020812: possible afterglow candidate
  45. GRB020812: possible afterglow candidate
  46. GRB020813, astrometric position
  47. Spectropolarimetry of GRB 020813
  48. GRB 020813 Afterglow Observations; Possible break
  49. GRB 020813: Absorption redshift
  50. GRB 020813 multiband optical observations
  51. GRB020813: optical afterglow
  52. GRB020813: Fading of Candidate OT
  53. GRB020813: Candidate Optical Afterglow
  54. GRB 020812 optical observation
  55. GRB 020715, optical observations
  56. GRB 020714, optical observations
  57. GRB020801: Imaging of Suggested OT Counterpart at the Magellan
  58. GRB020801: Candidate OT present in DSS
  59. HST Imaging of the Host of GRB 011121
  60. GRB020801, optical afterglow candidate
  61. GRB020331: Late-time Optical Light Curve (re-submission)
  62. GRB020331: Late-time Optical Light Curve
  63. GRB 020405: HST observations reveal red bump
  64. GRB 020410: Discovery of Probable OT by HST
  65. GRB 020124, HST observations of the fading afterglow
  66. IPN triangulation of GRB020708
  67. GRB 020705: Optical observations
  68. GRB 020625, optical observations
  69. GRB 020625: Optical observations
  70. GRB 020531: optical photometry of Chandra sources
  71. GRB020625 (=H2081): A Long Burst Localized by HETE
  72. HETE #2081: Optical observations
  73. The Probable Host Galaxy of GRB/XRF 020427
  74. GRB/XRF 020427, detection of an underlying system with the VLT
  75. Gemini IR Detection of AXP 1E 2259+586 Post-Burst
  76. SGR-like X-ray Bursts from AXP 1E 2259+586: follow-up
  77. AXP 1E2259+586: quasi-simultaneous optical observation
  78. AXP 1E2259+586 optical observations
  79. Fading Optical Source in the Field of GRB020531
  80. GRB 020531, INT+WFC deep optical upper limits
  81. SGR-like Bursts from the AXP 1E 2259+586
  82. GRB020405: polarimetric observations
  83. GRB 020531, simultaneous optical observations
  84. GRB 020604, optical observations
  85. GRB 020531/Candidate Redshift
  86. GRB020531: Detection of Candidate Host Galaxy
  87. GRB020531: Second epoch Chandra observations
  88. GRB020604, optical observations
  89. GRB020604, BVRcIc field photometry
  90. GRB020603, BVRcIc field observations
  91. GRB020531, BVRcIc field photometry
  92. GRB020531 Optical observations with TAROT
  93. GRB020531 Optical observations with TAROT
  94. GRB 020418, optical/near-IR observations
  95. GRB 020531, Radio Observations
  96. GRB020531 Optical Observations
  97. GRB020531: Observations with the Chandra X-ray Observatory
  98. GRB 020603: Optical Observations
  99. GRB 020603, R-band observation
  100. GRB020531: Upper Limit for Detection of Two TAROT Sources

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