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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"

31727 results found.

  1. XRF 020903: Optical observations
  2. IPN triangulation of GRB020904
  3. XRF 020903: Optical observations
  4. XRF 020903, optical observations
  5. GRB020903(=H2314): An X-Ray Flash Localized by HETE
  6. INTEGRAL GRBs added to GCN
  7. GRB020813: optical observation
  8. GRB020812: optical observation
  9. GRB020819(=H2275): Revised Localization with HETE Soft X-ray
  10. GRB020813: High-resolution optical spectroscopy
  11. GRB020819: optical observations at Bisei
  12. GRB020812: negative optical observations
  13. GRB 020812: optical observation at Kyoto University
  14. Second epoch K band imaging of GRB 020819
  15. GRB020813, Baade 6.5m data now available
  16. GRB 020813 : HST observations
  17. Confirming no variability for GRB02081
  18. GRB 020812: early time optical observation at Ouda Station
  19. GRB020813: VRI Decay Slopes
  20. GRB 020819 : OT candidate - confirmation of non variability
  21. GRB 020819: Optical observations
  22. K band observation of GRB 020819
  23. GRB020819: optical observations
  24. GRB020819(=H2275): A Long Burst Localized by the HETE WXM and SXC
  25. HETE 2275: Optical observations
  26. GRB020813: optical and NIR observations
  27. GRB020813, UBVRI field calibration
  28. GRB 020813: addendum to GCN 1498
  29. GRB020813: optical observations at Bisei
  30. GRB020813: V-band decay slope
  31. GRB020812: NIR observations
  32. Polarimetry of GRB020813: evidence for variability
  33. GRB020813 IRAM millimeter observations
  34. GRB020813: High-Resolution Optical Observations
  35. GRB020813(=H2262): Revised Localization with HETE SXC
  36. GRB 020812: optical observation at Bisei
  37. GRB020813: Early Time Magnitude
  38. GRB020813: optical observations; possible host galaxy
  39. GRB 020813, radio detection
  40. GRB020813, optical observations
  41. Millimeter observation of GRB 020813
  42. GRB020812: optical observations
  43. GRB 020813 : KISO multiband optical observations
  44. GRB020813, optical observations
  45. IPN error box for GRB020813
  46. IPN triangulation of GRB020813
  47. GRB020812: possible afterglow candidate
  48. Early Time Limits for GRB020813
  49. GRB020813, astrometric position
  50. Spectropolarimetry of GRB 020813
  51. GRB 020813 Afterglow Observations; Possible break
  52. GRB 020813: Absorption redshift
  53. GRB020813: optical afterglow
  54. GRB020813: Fading of Candidate OT
  55. GRB020813(=H2262): A Long, Bright Burst Localized by HETE in Near-Real Time
  56. GRB020812(=H2257): A Long Burst Localized by HETE in Near-Real Time
  57. GRB 020715, optical observations
  58. GRB 020714, optical observations
  59. GRB020801: Imaging of Suggested OT Counterpart at the Magellan
  60. GRB020801: Candidate OT present in DSS
  61. Further refinement to IPN error box for GRB020531
  62. GRB020331: Late-time Optical Light Curve (re-submission)
  63. GRB020331: Late-time Optical Light Curve
  64. GRB 020405: HST observations reveal red bump
  65. IPN triangulation of GRB020714
  66. IPN triangulation of GRB020715 (=GRB150702)
  67. GRB 020410: Discovery of Probable OT by HST
  68. GRB 020124, HST observations of the fading afterglow
  69. IPN triangulation of GRB020708
  70. IPN triangulation of GRB020708
  71. IPN error box for GRB020706
  72. Correction to IPN error box for GRB020706
  73. IPN triangulation of GRB020706
  74. GRB 020625, optical observations
  75. GRB 020531: optical photometry of Chandra sources
  76. GRB020625 (=H2081): A Long Burst Localized by HETE
  77. The Probable Host Galaxy of GRB/XRF 020427
  78. GRB/XRF 020427, detection of an underlying system with the VLT
  79. SGR-like X-ray Bursts from AXP 1E 2259+586: follow-up
  80. AXP 1E2259+586: quasi-simultaneous optical observation
  81. AXP 1E2259+586 optical observations
  82. Fading Optical Source in the Field of GRB020531
  83. GRB 020531, INT+WFC deep optical upper limits
  84. GRB020405: polarimetric observations
  85. GRB 020531, simultaneous optical observations
  86. GRB 020604, optical observations
  87. GRB 020531/Candidate Redshift
  88. GRB020531: Detection of Candidate Host Galaxy
  89. GRB020531: Second epoch Chandra observations
  90. GRB020604, optical observations
  91. GRB020604, BVRcIc field photometry
  92. GRB020603, BVRcIc field observations
  93. GRB020531, BVRcIc field photometry
  94. GRB020531 Optical observations with TAROT
  95. GRB020531 Optical observations with TAROT
  96. GRB 020531, Radio Observations
  97. GRB020531 Optical Observations
  98. GRB 020603: Optical Observations
  99. GRB 020603, R-band observation
  100. Correction to IPN triangulation of GRB020603 (possible short/hard burst)

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