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GCN Circulars

GCN Circulars are rapid astronomical bulletins submitted by and distributed to community members worldwide. They are used to share discoveries, observations, quantitative near-term predictions, requests for follow-up observations, or future observing plans related to high-energy, multi-messenger, and variable or transient astrophysical events. 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"

45663 results found.

  1. XRF 020903: Correction to GCN 1560
  2. XRF 020903: VRI observations
  3. IPN triangulation of GRB020926 (single large error box)
  4. GRB 020903: correction to GCN 1557
  5. XRF 020903: R band observations
  6. XRF 020903: Archival Optical Images
  7. Radio Observations of XRF 020903: The Missing Link
  8. XRF 020903: Supernova
  9. IPN triangulation of GRB020926 (two large error boxes)
  10. GRB020924 (ecliptic latitude-only localization)
  11. IPN triangulation of GRB020923 (two error boxes)
  12. IPN annulus for GRB020923
  13. IPN triangulation of GRB020914B
  14. Improved IPN position for GRB020918 (two large error boxes)
  15. IPN annulus for GRB020914B
  16. IPN triangulation of GRB020918 (annulus)
  17. IPN triangulation of GRB020911 (2 large error boxes)
  18. IPN triangulation of GRB020914 - clarification and additional information
  19. IPN triangulation of GRB020914
  20. GRB 020305: HST/STIS observations
  21. Confirmation of IPN error box for GRB020910
  22. IPN triangulation of GRB020910
  23. IPN GCN Circulars now to be issued without restriction
  24. Single IPN error box for GRB020904
  25. XRF 020903: optical observation at Kyoto
  26. GRB020322 : HST/STIS observations
  27. XRF 020903: Optical observations
  28. IPN triangulation of GRB020904
  29. XRF 020903: Optical observations
  30. IPN detection of a burst from SGR1900+14
  31. XRF 020903, optical observations
  32. GRB020903(=H2314): An X-Ray Flash Localized by HETE
  33. INTEGRAL GRBs added to GCN
  34. GRB020813: optical observation
  35. GRB020812: optical observation
  36. GRB020819(=H2275): Revised Localization with HETE Soft X-ray
  37. SGR1900+14 burst localized by HETE
  38. GRB020813: High-resolution optical spectroscopy
  39. GRB020819: optical observations at Bisei
  40. GRB020812: negative optical observations
  41. GRB 020812: optical observation at Kyoto University
  42. Second epoch K band imaging of GRB 020819
  43. GRB020813, Baade 6.5m data now available
  44. GRB 020813 : HST observations
  45. Confirming no variability for GRB02081
  46. GRB020819 : Optical observations at KISO
  47. GRB 020812: early time optical observation at Ouda Station
  48. GRB020813: VRI Decay Slopes
  49. GRB020813: Magellan BVRI Photometry
  50. GRB 020819 : OT candidate - confirmation of non variability
  51. GRB 020819: Optical observations
  52. K band observation of GRB 020819
  53. GRB020819: optical observations
  54. GRB020819(=H2275): A Long Burst Localized by the HETE WXM and SXC
  55. IPN triangulation of GRB020819 (HETE 2275)
  56. HETE 2275: Optical observations
  57. GRB020813: optical and NIR observations
  58. GRB020813: Fading X-ray Afterglow Observed with Chandra
  59. GRB020813, UBVRI field calibration
  60. GRB 020813: addendum to GCN 1498
  61. GRB020813: optical observations at Bisei
  62. GRB020813: V-band decay slope
  63. GRB020812: NIR observations
  64. Polarimetry of GRB020813: evidence for variability
  65. GRB020813 IRAM millimeter observations
  66. GRB020812: optical observations
  67. GRB020813: High-Resolution Optical Observations
  68. GRB020813(=H2262): Revised Localization with HETE SXC
  69. GRB 020812: optical observation at Bisei
  70. GRB020813: Early Time Magnitude
  71. GRB020813: optical observations; possible host galaxy
  72. GRB 020813, radio detection
  73. GRB 020812 : optical afterglow candidate
  74. GRB020813, optical observations
  75. Millimeter observation of GRB 020813
  76. GRB020812: optical observations
  77. GRB 020813 : KISO multiband optical observations
  78. GRB020813, optical observations
  79. IPN error box for GRB020813
  80. IPN triangulation of GRB020813
  81. GRB020812: possible afterglow candidate
  82. Early Time Limits for GRB020813
  83. GRB020812: possible afterglow candidate
  84. GRB020813, astrometric position
  85. Spectropolarimetry of GRB 020813
  86. GRB 020813 Afterglow Observations; Possible break
  87. GRB 020813: Absorption redshift
  88. GRB 020813 multiband optical observations
  89. GRB020813: optical afterglow
  90. GRB020813: Fading of Candidate OT
  91. GRB020813(=H2262): A Long, Bright Burst Localized by HETE in Near-Real Time
  92. GRB020813: Candidate Optical Afterglow
  93. GRB 020812 optical observation
  94. GRB020812(=H2257): A Long Burst Localized by HETE in Near-Real Time
  95. GRB 020715, optical observations
  96. GRB 020714, optical observations
  97. GRB020801: Imaging of Suggested OT Counterpart at the Magellan
  98. GRB020801: Candidate OT present in DSS
  99. HST Imaging of the Host of GRB 011121
  100. GRB020801, optical afterglow candidate

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