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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"

36723 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. IPN triangulation of GRB020904
  19. IPN detection of a burst from SGR1900+14
  20. INTEGRAL GRBs added to GCN
  21. GRB020813: High-resolution optical spectroscopy
  22. GRB 020812: optical observation at Kyoto University
  23. Second epoch K band imaging of GRB 020819
  24. GRB020813, Baade 6.5m data now available
  25. GRB 020813 : HST observations
  26. Confirming no variability for GRB02081
  27. GRB020819 : Optical observations at KISO
  28. GRB 020812: early time optical observation at Ouda Station
  29. GRB020813: VRI Decay Slopes
  30. GRB 020819 : OT candidate - confirmation of non variability
  31. GRB 020819: Optical observations
  32. K band observation of GRB 020819
  33. GRB020819: optical observations
  34. GRB020819(=H2275): A Long Burst Localized by the HETE WXM and SXC
  35. IPN triangulation of GRB020819 (HETE 2275)
  36. GRB020813, UBVRI field calibration
  37. GRB 020813: addendum to GCN 1498
  38. GRB020813: optical observations at Bisei
  39. GRB020813: V-band decay slope
  40. Polarimetry of GRB020813: evidence for variability
  41. GRB020813 IRAM millimeter observations
  42. GRB020812: optical observations
  43. GRB 020812: optical observation at Bisei
  44. GRB020813: optical observations; possible host galaxy
  45. GRB 020813, radio detection
  46. GRB 020812 : optical afterglow candidate
  47. Millimeter observation of GRB 020813
  48. GRB020812: optical observations
  49. GRB 020813 : KISO multiband optical observations
  50. IPN error box for GRB020813
  51. IPN triangulation of GRB020813
  52. GRB020812: possible afterglow candidate
  53. Early Time Limits for GRB020813
  54. GRB020812: possible afterglow candidate
  55. GRB020813, astrometric position
  56. Spectropolarimetry of GRB 020813
  57. GRB 020813 Afterglow Observations; Possible break
  58. GRB 020813: Absorption redshift
  59. GRB 020813 multiband optical observations
  60. GRB020813(=H2262): A Long, Bright Burst Localized by HETE in Near-Real Time
  61. GRB 020812 optical observation
  62. GRB020812(=H2257): A Long Burst Localized by HETE in Near-Real Time
  63. GRB 020715, optical observations
  64. GRB 020714, optical observations
  65. GRB020801: Imaging of Suggested OT Counterpart at the Magellan
  66. HST Imaging of the Host of GRB 011121
  67. GRB020801, optical afterglow candidate
  68. Further refinement to IPN error box for GRB020531
  69. GRB020331: Late-time Optical Light Curve (re-submission)
  70. GRB020331: Late-time Optical Light Curve
  71. GRB 020405: HST observations reveal red bump
  72. IPN triangulation of GRB020714
  73. IPN triangulation of GRB020715 (=GRB150702)
  74. IPN triangulation of GRB020714
  75. IPN triangulation of GRB150702
  76. GRB 020410: Discovery of Probable OT by HST
  77. GRB 020124, HST observations of the fading afterglow
  78. IPN triangulation of GRB020708
  79. IPN triangulation of GRB020708
  80. IPN error box for GRB020706
  81. IPN triangulation of GRB020706
  82. GRB 020705: Optical observations
  83. GRB 020625, optical observations
  84. GRB 020625: Optical observations
  85. GRB 020531: optical photometry of Chandra sources
  86. GRB020625 (=H2081): A Long Burst Localized by HETE
  87. The Probable Host Galaxy of GRB/XRF 020427
  88. GRB/XRF 020427, detection of an underlying system with the VLT
  89. GRB 020531, INT+WFC deep optical upper limits
  90. GRB020405: polarimetric observations
  91. GRB 020531, simultaneous optical observations
  92. GRB 020604, optical observations
  93. GRB 020531/Candidate Redshift
  94. GRB020531: Second epoch Chandra observations
  95. GRB020604, optical observations
  96. GRB020604, BVRcIc field photometry
  97. GRB020603, BVRcIc field observations
  98. GRB020531, BVRcIc field photometry
  99. GRB020531 Optical observations with TAROT
  100. GRB020531 Optical observations with TAROT

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