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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"

32588 results found.

  1. GRB 021004 redshift
  2. GRB021004: restart of optical decay
  3. GRB 021004: Optical Decay
  4. GRB 021004, spectroscopic observations
  5. GRB021004: not fading anymore?
  6. GRB 021004: Optical Photometry at 2.5 Days
  7. GRB 021004: polarimetric observations
  8. GRB 021004: V-band Polarimetric Observations
  9. GRB021004: Update Bisei photometric data
  10. GRB 021004: Optical Decay
  11. GRB021004, astrometric position
  12. GRB021004, Optical Observations
  13. IRAM Millimeter detection of GRB 021004
  14. GRB 021004: Optical observations at RIKEN
  15. GRB 021004 radio observation
  16. GRB 021004: Optical Observations
  17. GRB021004: continued fading
  18. GRB 021004: Optical Photometry at 1.5 Days
  19. GRB021004, Optical Observations
  20. GRB021004, BVRcIc field photometry
  21. GRB 021004: Optical observations
  22. GRB 021004: optical counterpart
  23. GRB 021004, optical observations
  24. GRB021004: Optical Spectroscopy
  25. GRB 021004: Optical Observations
  26. GRB 021004, SPM optical observations
  27. GRB 021004, optical observations
  28. GRB 021004 radio search
  29. GRB 021004: radio observations
  30. GRB 021004: steepening of the optical decay slope
  31. GRB021004: Upper limits from recent and historical observations
  32. XRF020903, BVRI field photometry
  33. GRB021004: optical observations at Nyrola
  34. GRB021004: Absorption redshift
  35. GRB021004(=H2380): Revised Localization with HETE Soft X-ray
  36. GRB021004: optical observations at Bisei
  37. GRB 021004: Kyoto observation
  38. GRB021004(=H2380): A Long GRB Localized by HETE in Near-Real Time
  39. XRF020903: TNG and Asiago photometry
  40. GRB 020903: Optical observations at RIKEN
  41. XRF 020903: Correction to GCN 1560
  42. XRF 020903: VRI observations
  43. IPN triangulation of GRB020926 (single large error box)
  44. GRB 020903: correction to GCN 1557
  45. XRF 020903: R band observations
  46. XRF 020903: Archival Optical Images
  47. Radio Observations of XRF 020903: The Missing Link
  48. XRF 020903: Supernova
  49. GRB020924 (ecliptic latitude-only localization)
  50. IPN triangulation of GRB020923 (two error boxes)
  51. IPN triangulation of GRB020914B
  52. Improved IPN position for GRB020918 (two large error boxes)
  53. IPN annulus for GRB020914B
  54. IPN triangulation of GRB020914 - clarification and additional information
  55. IPN triangulation of GRB020914
  56. GRB 020305: HST/STIS observations
  57. Confirmation of IPN error box for GRB020910
  58. IPN GCN Circulars now to be issued without restriction
  59. Single IPN error box for GRB020904
  60. XRF 020903: optical observation at Kyoto
  61. GRB020322 : HST/STIS observations
  62. XRF 020903: Optical observations
  63. IPN triangulation of GRB020904
  64. XRF 020903: Optical observations
  65. XRF 020903, optical observations
  66. GRB020903(=H2314): An X-Ray Flash Localized by HETE
  67. INTEGRAL GRBs added to GCN
  68. GRB020813: optical observation
  69. GRB020812: optical observation
  70. GRB020819(=H2275): Revised Localization with HETE Soft X-ray
  71. GRB020813: High-resolution optical spectroscopy
  72. GRB020819: optical observations at Bisei
  73. GRB020812: negative optical observations
  74. GRB 020812: optical observation at Kyoto University
  75. Second epoch K band imaging of GRB 020819
  76. GRB020813, Baade 6.5m data now available
  77. GRB 020813 : HST observations
  78. Confirming no variability for GRB02081
  79. GRB 020812: early time optical observation at Ouda Station
  80. GRB020813: VRI Decay Slopes
  81. GRB 020819 : OT candidate - confirmation of non variability
  82. GRB 020819: Optical observations
  83. K band observation of GRB 020819
  84. GRB020819: optical observations
  85. GRB020819(=H2275): A Long Burst Localized by the HETE WXM and SXC
  86. HETE 2275: Optical observations
  87. GRB020813: optical and NIR observations
  88. GRB020813, UBVRI field calibration
  89. GRB 020813: addendum to GCN 1498
  90. GRB020813: optical observations at Bisei
  91. GRB020813: V-band decay slope
  92. GRB020812: NIR observations
  93. Polarimetry of GRB020813: evidence for variability
  94. GRB020813 IRAM millimeter observations
  95. GRB020813: High-Resolution Optical Observations
  96. GRB020813(=H2262): Revised Localization with HETE SXC
  97. GRB 020812: optical observation at Bisei
  98. GRB020813: Early Time Magnitude
  99. GRB020813: optical observations; possible host galaxy
  100. GRB 020813, radio detection

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