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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. GRB 021004: V-band Polarimetric Observations
  2. GRB021004: Update Bisei photometric data
  3. GRB 021004: Optical Decay
  4. GRB021004, astrometric position
  5. GRB021004, Optical Observations
  6. IRAM Millimeter detection of GRB 021004
  7. GRB 021004: Optical observations at RIKEN
  8. GRB 021004 radio observation
  9. GRB 021004: Optical Observations
  10. GRB021004: continued fading
  11. GRB 021004: Optical Photometry at 1.5 Days
  12. GRB021004, Optical Observations
  13. GRB021004, BVRcIc field photometry
  14. GRB 021004: Optical observations
  15. GRB 021004: optical counterpart
  16. GRB 021004, optical observations
  17. GRB021004: Optical Spectroscopy
  18. GRB 021004: Optical Observations
  19. GRB 021004, SPM optical observations
  20. GRB 021004, optical observations
  21. GRB 021004 radio search
  22. GRB 021004: radio observations
  23. GRB 021004: steepening of the optical decay slope
  24. GRB021004: Upper limits from recent and historical observations
  25. XRF020903, BVRI field photometry
  26. GRB021004: optical observations at Nyrola
  27. GRB021004: Absorption redshift
  28. GRB021004(=H2380): Revised Localization with HETE Soft X-ray
  29. GRB021004: optical observations at Bisei
  30. GRB 021004: Kyoto observation
  31. GRB021004(=H2380): A Long GRB Localized by HETE in Near-Real Time
  32. GRB021004: Optical Afterglow
  33. XRF020903: TNG and Asiago photometry
  34. GRB 020903: Optical observations at RIKEN
  35. XRF 020903: Correction to GCN 1560
  36. XRF 020903: VRI observations
  37. IPN triangulation of GRB020926 (single large error box)
  38. GRB 020903: correction to GCN 1557
  39. XRF 020903: R band observations
  40. XRF 020903: Archival Optical Images
  41. Radio Observations of XRF 020903: The Missing Link
  42. XRF 020903: Supernova
  43. IPN triangulation of GRB020926 (two large error boxes)
  44. GRB020924 (ecliptic latitude-only localization)
  45. IPN triangulation of GRB020923 (two error boxes)
  46. IPN annulus for GRB020923
  47. IPN triangulation of GRB020914B
  48. Improved IPN position for GRB020918 (two large error boxes)
  49. IPN annulus for GRB020914B
  50. IPN triangulation of GRB020918 (annulus)
  51. IPN triangulation of GRB020911 (2 large error boxes)
  52. IPN triangulation of GRB020914 - clarification and additional information
  53. IPN triangulation of GRB020914
  54. GRB 020305: HST/STIS observations
  55. Confirmation of IPN error box for GRB020910
  56. IPN triangulation of GRB020910
  57. IPN GCN Circulars now to be issued without restriction
  58. Single IPN error box for GRB020904
  59. XRF 020903: optical observation at Kyoto
  60. GRB020322 : HST/STIS observations
  61. XRF 020903: Optical observations
  62. IPN triangulation of GRB020904
  63. XRF 020903: Optical observations
  64. IPN detection of a burst from SGR1900+14
  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. SGR1900+14 burst localized by HETE
  72. GRB020813: High-resolution optical spectroscopy
  73. GRB020819: optical observations at Bisei
  74. GRB020812: negative optical observations
  75. GRB 020812: optical observation at Kyoto University
  76. Second epoch K band imaging of GRB 020819
  77. GRB020813, Baade 6.5m data now available
  78. GRB 020813 : HST observations
  79. Confirming no variability for GRB02081
  80. GRB020819 : Optical observations at KISO
  81. GRB 020812: early time optical observation at Ouda Station
  82. GRB020813: VRI Decay Slopes
  83. GRB020813: Magellan BVRI Photometry
  84. GRB 020819 : OT candidate - confirmation of non variability
  85. GRB 020819: Optical observations
  86. K band observation of GRB 020819
  87. GRB020819: optical observations
  88. GRB020819(=H2275): A Long Burst Localized by the HETE WXM and SXC
  89. IPN triangulation of GRB020819 (HETE 2275)
  90. HETE 2275: Optical observations
  91. GRB020813: optical and NIR observations
  92. GRB020813: Fading X-ray Afterglow Observed with Chandra
  93. GRB020813, UBVRI field calibration
  94. GRB 020813: addendum to GCN 1498
  95. GRB020813: optical observations at Bisei
  96. GRB020813: V-band decay slope
  97. GRB020812: NIR observations
  98. Polarimetry of GRB020813: evidence for variability
  99. GRB020813 IRAM millimeter observations
  100. GRB020812: optical observations

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