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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"

35324 results found.

  1. IPN triangulation of GRB020914B
  2. Improved IPN position for GRB020918 (two large error boxes)
  3. IPN annulus for GRB020914B
  4. IPN triangulation of GRB020918 (annulus)
  5. IPN triangulation of GRB020911 (2 large error boxes)
  6. IPN triangulation of GRB020914 - clarification and additional information
  7. IPN triangulation of GRB020914
  8. GRB 020305: HST/STIS observations
  9. Confirmation of IPN error box for GRB020910
  10. IPN triangulation of GRB020910
  11. IPN GCN Circulars now to be issued without restriction
  12. Single IPN error box for GRB020904
  13. XRF 020903: optical observation at Kyoto
  14. GRB020322 : HST/STIS observations
  15. IPN triangulation of GRB020904
  16. IPN detection of a burst from SGR1900+14
  17. INTEGRAL GRBs added to GCN
  18. GRB020813: High-resolution optical spectroscopy
  19. GRB 020812: optical observation at Kyoto University
  20. Second epoch K band imaging of GRB 020819
  21. GRB020813, Baade 6.5m data now available
  22. GRB 020813 : HST observations
  23. Confirming no variability for GRB02081
  24. GRB020819 : Optical observations at KISO
  25. GRB 020812: early time optical observation at Ouda Station
  26. GRB020813: VRI Decay Slopes
  27. GRB 020819 : OT candidate - confirmation of non variability
  28. GRB 020819: Optical observations
  29. K band observation of GRB 020819
  30. GRB020819: optical observations
  31. GRB020819(=H2275): A Long Burst Localized by the HETE WXM and SXC
  32. IPN triangulation of GRB020819 (HETE 2275)
  33. GRB020813, UBVRI field calibration
  34. GRB 020813: addendum to GCN 1498
  35. GRB020813: optical observations at Bisei
  36. GRB020813: V-band decay slope
  37. Polarimetry of GRB020813: evidence for variability
  38. GRB020813 IRAM millimeter observations
  39. GRB020812: optical observations
  40. GRB 020812: optical observation at Bisei
  41. GRB020813: optical observations; possible host galaxy
  42. GRB 020813, radio detection
  43. GRB 020812 : optical afterglow candidate
  44. Millimeter observation of GRB 020813
  45. GRB020812: optical observations
  46. GRB 020813 : KISO multiband optical observations
  47. IPN error box for GRB020813
  48. IPN triangulation of GRB020813
  49. GRB020812: possible afterglow candidate
  50. Early Time Limits for GRB020813
  51. GRB020812: possible afterglow candidate
  52. GRB020813, astrometric position
  53. Spectropolarimetry of GRB 020813
  54. GRB 020813 Afterglow Observations; Possible break
  55. GRB 020813: Absorption redshift
  56. GRB 020813 multiband optical observations
  57. GRB020813(=H2262): A Long, Bright Burst Localized by HETE in Near-Real Time
  58. GRB 020812 optical observation
  59. GRB020812(=H2257): A Long Burst Localized by HETE in Near-Real Time
  60. GRB 020715, optical observations
  61. GRB 020714, optical observations
  62. GRB020801: Imaging of Suggested OT Counterpart at the Magellan
  63. HST Imaging of the Host of GRB 011121
  64. GRB020801, optical afterglow candidate
  65. Further refinement to IPN error box for GRB020531
  66. GRB020331: Late-time Optical Light Curve (re-submission)
  67. GRB020331: Late-time Optical Light Curve
  68. GRB 020405: HST observations reveal red bump
  69. IPN triangulation of GRB020714
  70. IPN triangulation of GRB020715 (=GRB150702)
  71. IPN triangulation of GRB020714
  72. IPN triangulation of GRB150702
  73. GRB 020410: Discovery of Probable OT by HST
  74. GRB 020124, HST observations of the fading afterglow
  75. IPN triangulation of GRB020708
  76. IPN triangulation of GRB020708
  77. IPN error box for GRB020706
  78. IPN triangulation of GRB020706
  79. GRB 020705: Optical observations
  80. GRB 020625, optical observations
  81. GRB 020625: Optical observations
  82. GRB 020531: optical photometry of Chandra sources
  83. GRB020625 (=H2081): A Long Burst Localized by HETE
  84. The Probable Host Galaxy of GRB/XRF 020427
  85. GRB/XRF 020427, detection of an underlying system with the VLT
  86. GRB 020531, INT+WFC deep optical upper limits
  87. GRB020405: polarimetric observations
  88. GRB 020531, simultaneous optical observations
  89. GRB 020604, optical observations
  90. GRB 020531/Candidate Redshift
  91. GRB020531: Second epoch Chandra observations
  92. GRB020604, optical observations
  93. GRB020604, BVRcIc field photometry
  94. GRB020603, BVRcIc field observations
  95. GRB020531, BVRcIc field photometry
  96. GRB020531 Optical observations with TAROT
  97. GRB020531 Optical observations with TAROT
  98. GRB 020418, optical/near-IR observations
  99. GRB 020531, Radio Observations
  100. IPN triangulation of GRB020604

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