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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"

41191 results found.

  1. IPN triangulation of GRB020926 (single large error box)
  2. XRF 020903: R band observations
  3. XRF 020903: Archival Optical Images
  4. Radio Observations of XRF 020903: The Missing Link
  5. XRF 020903: Supernova
  6. IPN triangulation of GRB020926 (two large error boxes)
  7. GRB020924 (ecliptic latitude-only localization)
  8. IPN annulus for GRB020923
  9. IPN triangulation of GRB020914B
  10. Improved IPN position for GRB020918 (two large error boxes)
  11. IPN annulus for GRB020914B
  12. IPN triangulation of GRB020911 (2 large error boxes)
  13. IPN triangulation of GRB020914 - clarification and additional information
  14. IPN triangulation of GRB020914
  15. GRB 020305: HST/STIS observations
  16. IPN GCN Circulars now to be issued without restriction
  17. XRF 020903: optical observation at Kyoto
  18. GRB020322 : HST/STIS observations
  19. XRF 020903: Optical observations
  20. IPN triangulation of GRB020904
  21. XRF 020903: Optical observations
  22. IPN detection of a burst from SGR1900+14
  23. XRF 020903, optical observations
  24. GRB020903(=H2314): An X-Ray Flash Localized by HETE
  25. INTEGRAL GRBs added to GCN
  26. GRB020813: optical observation
  27. GRB020812: optical observation
  28. GRB020819(=H2275): Revised Localization with HETE Soft X-ray
  29. SGR1900+14 burst localized by HETE
  30. GRB020813: High-resolution optical spectroscopy
  31. GRB020819: optical observations at Bisei
  32. GRB020812: negative optical observations
  33. GRB 020812: optical observation at Kyoto University
  34. Second epoch K band imaging of GRB 020819
  35. GRB020813, Baade 6.5m data now available
  36. GRB 020813 : HST observations
  37. Confirming no variability for GRB02081
  38. GRB020819 : Optical observations at KISO
  39. GRB 020812: early time optical observation at Ouda Station
  40. GRB020813: VRI Decay Slopes
  41. GRB020813: Magellan BVRI Photometry
  42. GRB 020819 : OT candidate - confirmation of non variability
  43. GRB 020819: Optical observations
  44. K band observation of GRB 020819
  45. GRB020819: optical observations
  46. GRB020819(=H2275): A Long Burst Localized by the HETE WXM and SXC
  47. IPN triangulation of GRB020819 (HETE 2275)
  48. HETE 2275: Optical observations
  49. GRB020813: optical and NIR observations
  50. GRB020813: Fading X-ray Afterglow Observed with Chandra
  51. GRB020813, UBVRI field calibration
  52. GRB 020813: addendum to GCN 1498
  53. GRB020813: optical observations at Bisei
  54. GRB020813: V-band decay slope
  55. GRB020812: NIR observations
  56. Polarimetry of GRB020813: evidence for variability
  57. GRB020813 IRAM millimeter observations
  58. GRB020812: optical observations
  59. GRB020813: High-Resolution Optical Observations
  60. GRB020813(=H2262): Revised Localization with HETE SXC
  61. GRB 020812: optical observation at Bisei
  62. GRB020813: Early Time Magnitude
  63. GRB020813: optical observations; possible host galaxy
  64. GRB 020813, radio detection
  65. GRB 020812 : optical afterglow candidate
  66. GRB020813, optical observations
  67. Millimeter observation of GRB 020813
  68. GRB020812: optical observations
  69. GRB 020813 : KISO multiband optical observations
  70. GRB020813, optical observations
  71. IPN error box for GRB020813
  72. IPN triangulation of GRB020813
  73. GRB020812: possible afterglow candidate
  74. Early Time Limits for GRB020813
  75. GRB020812: possible afterglow candidate
  76. GRB020813, astrometric position
  77. Spectropolarimetry of GRB 020813
  78. GRB 020813: Absorption redshift
  79. GRB 020813 multiband optical observations
  80. GRB020813: optical afterglow
  81. GRB020813: Fading of Candidate OT
  82. GRB020813(=H2262): A Long, Bright Burst Localized by HETE in Near-Real Time
  83. GRB020813: Candidate Optical Afterglow
  84. GRB 020812 optical observation
  85. GRB020812(=H2257): A Long Burst Localized by HETE in Near-Real Time
  86. GRB 020715, optical observations
  87. GRB 020714, optical observations
  88. GRB020801: Imaging of Suggested OT Counterpart at the Magellan
  89. HST Imaging of the Host of GRB 011121
  90. GRB020801, optical afterglow candidate
  91. Further refinement to IPN error box for GRB020531
  92. GRB020331: Late-time Optical Light Curve (re-submission)
  93. GRB020331: Late-time Optical Light Curve
  94. GRB 020405: HST observations reveal red bump
  95. GRB 020410: Discovery of Probable OT by HST
  96. GRB 020124, HST observations of the fading afterglow
  97. IPN triangulation of GRB020708
  98. Correction to IPN error box for GRB020706
  99. GRB 020705: Optical observations
  100. GRB 020625, optical observations

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