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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"

44434 results found.

  1. GRB020924 (ecliptic latitude-only localization)
  2. IPN triangulation of GRB020923 (two error boxes)
  3. IPN annulus for GRB020923
  4. IPN triangulation of GRB020914B
  5. Improved IPN position for GRB020918 (two large error boxes)
  6. IPN annulus for GRB020914B
  7. IPN triangulation of GRB020918 (annulus)
  8. IPN triangulation of GRB020911 (2 large error boxes)
  9. IPN triangulation of GRB020914 - clarification and additional information
  10. IPN triangulation of GRB020914
  11. GRB 020305: HST/STIS observations
  12. Confirmation of IPN error box for GRB020910
  13. IPN triangulation of GRB020910
  14. IPN GCN Circulars now to be issued without restriction
  15. Single IPN error box for GRB020904
  16. XRF 020903: optical observation at Kyoto
  17. GRB020322 : HST/STIS observations
  18. XRF 020903: Optical observations
  19. IPN triangulation of GRB020904
  20. XRF 020903: Optical observations
  21. IPN detection of a burst from SGR1900+14
  22. XRF 020903, optical observations
  23. GRB020903(=H2314): An X-Ray Flash Localized by HETE
  24. INTEGRAL GRBs added to GCN
  25. GRB020813: optical observation
  26. GRB020812: optical observation
  27. GRB020819(=H2275): Revised Localization with HETE Soft X-ray
  28. SGR1900+14 burst localized by HETE
  29. GRB020813: High-resolution optical spectroscopy
  30. GRB020819: optical observations at Bisei
  31. GRB020812: negative optical observations
  32. GRB 020812: optical observation at Kyoto University
  33. Second epoch K band imaging of GRB 020819
  34. GRB020813, Baade 6.5m data now available
  35. GRB 020813 : HST observations
  36. Confirming no variability for GRB02081
  37. GRB020819 : Optical observations at KISO
  38. GRB 020812: early time optical observation at Ouda Station
  39. GRB020813: VRI Decay Slopes
  40. GRB020813: Magellan BVRI Photometry
  41. GRB 020819 : OT candidate - confirmation of non variability
  42. GRB 020819: Optical observations
  43. K band observation of GRB 020819
  44. GRB020819: optical observations
  45. GRB020819(=H2275): A Long Burst Localized by the HETE WXM and SXC
  46. IPN triangulation of GRB020819 (HETE 2275)
  47. HETE 2275: Optical observations
  48. GRB020813: optical and NIR observations
  49. GRB020813: Fading X-ray Afterglow Observed with Chandra
  50. GRB020813, UBVRI field calibration
  51. GRB 020813: addendum to GCN 1498
  52. GRB020813: optical observations at Bisei
  53. GRB020813: V-band decay slope
  54. GRB020812: NIR observations
  55. Polarimetry of GRB020813: evidence for variability
  56. GRB020813 IRAM millimeter observations
  57. GRB020812: optical observations
  58. GRB020813: High-Resolution Optical Observations
  59. GRB020813(=H2262): Revised Localization with HETE SXC
  60. GRB 020812: optical observation at Bisei
  61. GRB020813: Early Time Magnitude
  62. GRB020813: optical observations; possible host galaxy
  63. GRB 020813, radio detection
  64. GRB 020812 : optical afterglow candidate
  65. GRB020813, optical observations
  66. Millimeter observation of GRB 020813
  67. GRB020812: optical observations
  68. GRB 020813 : KISO multiband optical observations
  69. GRB020813, optical observations
  70. IPN error box for GRB020813
  71. IPN triangulation of GRB020813
  72. GRB020812: possible afterglow candidate
  73. Early Time Limits for GRB020813
  74. GRB020812: possible afterglow candidate
  75. GRB020813, astrometric position
  76. Spectropolarimetry of GRB 020813
  77. GRB 020813 Afterglow Observations; Possible break
  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. GRB020801: Candidate OT present in DSS
  90. HST Imaging of the Host of GRB 011121
  91. GRB020801, optical afterglow candidate
  92. Further refinement to IPN error box for GRB020531
  93. GRB020331: Late-time Optical Light Curve (re-submission)
  94. GRB020331: Late-time Optical Light Curve
  95. GRB 020405: HST observations reveal red bump
  96. IPN triangulation of GRB020714
  97. IPN triangulation of GRB020715 (=GRB150702)
  98. IPN triangulation of GRB020714
  99. IPN triangulation of GRB150702
  100. GRB 020410: Discovery of Probable OT by HST

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