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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"

45431 results found.

  1. IPN triangulation of GRB020923 (two error boxes)
  2. IPN annulus for GRB020923
  3. IPN triangulation of GRB020914B
  4. Improved IPN position for GRB020918 (two large error boxes)
  5. IPN annulus for GRB020914B
  6. IPN triangulation of GRB020918 (annulus)
  7. IPN triangulation of GRB020911 (2 large error boxes)
  8. IPN triangulation of GRB020914 - clarification and additional information
  9. IPN triangulation of GRB020914
  10. GRB 020305: HST/STIS observations
  11. Confirmation of IPN error box for GRB020910
  12. IPN triangulation of GRB020910
  13. IPN GCN Circulars now to be issued without restriction
  14. Single IPN error box for GRB020904
  15. XRF 020903: optical observation at Kyoto
  16. GRB020322 : HST/STIS observations
  17. XRF 020903: Optical observations
  18. IPN triangulation of GRB020904
  19. XRF 020903: Optical observations
  20. IPN detection of a burst from SGR1900+14
  21. XRF 020903, optical observations
  22. GRB020903(=H2314): An X-Ray Flash Localized by HETE
  23. INTEGRAL GRBs added to GCN
  24. GRB020813: optical observation
  25. GRB020812: optical observation
  26. GRB020819(=H2275): Revised Localization with HETE Soft X-ray
  27. SGR1900+14 burst localized by HETE
  28. GRB020813: High-resolution optical spectroscopy
  29. GRB020819: optical observations at Bisei
  30. GRB020812: negative optical observations
  31. GRB 020812: optical observation at Kyoto University
  32. Second epoch K band imaging of GRB 020819
  33. GRB020813, Baade 6.5m data now available
  34. GRB 020813 : HST observations
  35. Confirming no variability for GRB02081
  36. GRB020819 : Optical observations at KISO
  37. GRB 020812: early time optical observation at Ouda Station
  38. GRB020813: VRI Decay Slopes
  39. GRB020813: Magellan BVRI Photometry
  40. GRB 020819 : OT candidate - confirmation of non variability
  41. GRB 020819: Optical observations
  42. K band observation of GRB 020819
  43. GRB020819: optical observations
  44. GRB020819(=H2275): A Long Burst Localized by the HETE WXM and SXC
  45. IPN triangulation of GRB020819 (HETE 2275)
  46. HETE 2275: Optical observations
  47. GRB020813: optical and NIR observations
  48. GRB020813: Fading X-ray Afterglow Observed with Chandra
  49. GRB020813, UBVRI field calibration
  50. GRB 020813: addendum to GCN 1498
  51. GRB020813: optical observations at Bisei
  52. GRB020813: V-band decay slope
  53. GRB020812: NIR observations
  54. Polarimetry of GRB020813: evidence for variability
  55. GRB020813 IRAM millimeter observations
  56. GRB020812: optical observations
  57. GRB020813: High-Resolution Optical Observations
  58. GRB020813(=H2262): Revised Localization with HETE SXC
  59. GRB 020812: optical observation at Bisei
  60. GRB020813: Early Time Magnitude
  61. GRB020813: optical observations; possible host galaxy
  62. GRB 020813, radio detection
  63. GRB 020812 : optical afterglow candidate
  64. GRB020813, optical observations
  65. Millimeter observation of GRB 020813
  66. GRB020812: optical observations
  67. GRB 020813 : KISO multiband optical observations
  68. GRB020813, optical observations
  69. IPN error box for GRB020813
  70. IPN triangulation of GRB020813
  71. GRB020812: possible afterglow candidate
  72. Early Time Limits for GRB020813
  73. GRB020812: possible afterglow candidate
  74. GRB020813, astrometric position
  75. Spectropolarimetry of GRB 020813
  76. GRB 020813 Afterglow Observations; Possible break
  77. GRB 020813: Absorption redshift
  78. GRB 020813 multiband optical observations
  79. GRB020813: optical afterglow
  80. GRB020813: Fading of Candidate OT
  81. GRB020813(=H2262): A Long, Bright Burst Localized by HETE in Near-Real Time
  82. GRB020813: Candidate Optical Afterglow
  83. GRB 020812 optical observation
  84. GRB020812(=H2257): A Long Burst Localized by HETE in Near-Real Time
  85. GRB 020715, optical observations
  86. GRB 020714, optical observations
  87. GRB020801: Imaging of Suggested OT Counterpart at the Magellan
  88. GRB020801: Candidate OT present in DSS
  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. IPN triangulation of GRB020714
  96. IPN triangulation of GRB020715 (=GRB150702)
  97. IPN triangulation of GRB020714
  98. IPN triangulation of GRB150702
  99. GRB 020410: Discovery of Probable OT by HST
  100. GRB 020124, HST observations of the fading afterglow

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