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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"

27322 results found.

  1. GRB021004, BVRcIc field photometry
  2. GRB021004: Optical Spectroscopy
  3. GRB 021004 radio search
  4. XRF020903, BVRI field photometry
  5. XRF020903: TNG and Asiago photometry
  6. GRB 020903: Optical observations at RIKEN
  7. XRF 020903: Correction to GCN 1560
  8. XRF 020903: VRI observations
  9. XRF 020903: R band observations
  10. XRF 020903: Archival Optical Images
  11. Radio Observations of XRF 020903: The Missing Link
  12. XRF 020903: Supernova
  13. IPN triangulation of GRB020923 (two error boxes)
  14. IPN triangulation of GRB020914B
  15. IPN triangulation of GRB020911 (2 large error boxes)
  16. GRB 020305: HST/STIS observations
  17. Confirmation of IPN error box for GRB020910
  18. IPN triangulation of GRB020910
  19. IPN GCN Circulars now to be issued without restriction
  20. Single IPN error box for GRB020904
  21. XRF 020903: optical observation at Kyoto
  22. GRB020322 : HST/STIS observations
  23. XRF 020903: Optical observations
  24. IPN triangulation of GRB020904
  25. INTEGRAL GRBs added to GCN
  26. SGR1900+14 burst localized by HETE
  27. GRB020813: High-resolution optical spectroscopy
  28. GRB020812: negative optical observations
  29. GRB 020812: optical observation at Kyoto University
  30. Second epoch K band imaging of GRB 020819
  31. GRB 020813 : HST observations
  32. GRB 020812: early time optical observation at Ouda Station
  33. GRB020813: Magellan BVRI Photometry
  34. GRB 020819: Optical observations
  35. K band observation of GRB 020819
  36. GRB020813: optical and NIR observations
  37. GRB020813: Fading X-ray Afterglow Observed with Chandra
  38. GRB020813, UBVRI field calibration
  39. GRB020812: NIR observations
  40. Polarimetry of GRB020813: evidence for variability
  41. GRB020813 IRAM millimeter observations
  42. GRB020812: optical observations
  43. GRB020813: High-Resolution Optical Observations
  44. GRB 020812: optical observation at Bisei
  45. GRB020813: Early Time Magnitude
  46. Millimeter observation of GRB 020813
  47. GRB020812: optical observations
  48. GRB 020813 : KISO multiband optical observations
  49. GRB020813, optical observations
  50. IPN error box for GRB020813
  51. GRB020813, astrometric position
  52. Spectropolarimetry of GRB 020813
  53. GRB 020812 optical observation
  54. GRB020812(=H2257): A Long Burst Localized by HETE in Near-Real Time
  55. GRB020801: Imaging of Suggested OT Counterpart at the Magellan
  56. HST Imaging of the Host of GRB 011121
  57. GRB020801, optical afterglow candidate
  58. GRB020331: Late-time Optical Light Curve (re-submission)
  59. GRB020331: Late-time Optical Light Curve
  60. IPN triangulation of GRB020714
  61. IPN triangulation of GRB020715 (=GRB150702)
  62. IPN triangulation of GRB020714
  63. IPN triangulation of GRB150702
  64. GRB 020410: Discovery of Probable OT by HST
  65. GRB 020124, HST observations of the fading afterglow
  66. IPN triangulation of GRB020708
  67. IPN triangulation of GRB020708
  68. Correction to IPN error box for GRB020706
  69. IPN triangulation of GRB020706
  70. GRB 020705: Optical observations
  71. GRB 020625, optical observations
  72. GRB 020625: Optical observations
  73. GRB 020531: optical photometry of Chandra sources
  74. GRB020625 (=H2081): A Long Burst Localized by HETE
  75. The Probable Host Galaxy of GRB/XRF 020427
  76. GRB/XRF 020427, detection of an underlying system with the VLT
  77. Gemini IR Detection of AXP 1E 2259+586 Post-Burst
  78. AXP 1E2259+586 optical observations
  79. Fading Optical Source in the Field of GRB020531
  80. GRB 020531, INT+WFC deep optical upper limits
  81. SGR-like Bursts from the AXP 1E 2259+586
  82. GRB020405: polarimetric observations
  83. GRB 020531, simultaneous optical observations
  84. GRB 020531/Candidate Redshift
  85. GRB020531: Detection of Candidate Host Galaxy
  86. GRB020531: Second epoch Chandra observations
  87. GRB020604, optical observations
  88. GRB020604, BVRcIc field photometry
  89. GRB020603, BVRcIc field observations
  90. GRB020531, BVRcIc field photometry
  91. GRB020531 Optical Observations
  92. GRB020531: Observations with the Chandra X-ray Observatory
  93. GRB020531, optical observations
  94. GRB020531: optical observations
  95. GRB020531(=H2042): Optical Observations
  96. GRB020531(=H2042): Optical Observations
  97. GRB020531: Optical observations
  98. GRB020531(=H2042): A Short, Hard Burst Localized by HETE
  99. GRB020525, optical observations
  100. HETE Observations of GX354-0 (= MXB1728-34, so-called "Slow

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