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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"

15722 results found.

  1. GRB 021004 redshift
  2. GRB021004: restart of optical decay
  3. GRB 021004: Optical Decay
  4. GRB 021004 continued IR fading
  5. HETE fluences for GRB021004
  6. GRB 021004: Optical Photometry at 2.5 Days
  7. GRB 021004: V-band Polarimetric Observations
  8. GRB 021004: Optical Decay
  9. GRB021004, astrometric position
  10. GRB021004, Optical Observations
  11. GRB 021004: Optical observations at RIKEN
  12. GRB 021004: Optical Observations
  13. GRB021004: continued fading
  14. GRB 021004: Optical Photometry at 1.5 Days
  15. GRB021004, Optical Observations
  16. GRB 021004: Optical observations
  17. GRB 021004: optical counterpart
  18. GRB 021004, optical observations
  19. GRB021004: Optical Spectroscopy
  20. GRB 021004: Optical Observations
  21. GRB 021004, SPM optical observations
  22. GRB 021004, optical observations
  23. GRB 021004: radio observations
  24. GRB 021004: steepening of the optical decay slope
  25. GRB021004: Upper limits from recent and historical observations
  26. GRB021004: optical observations at Nyrola
  27. GRB021004: Absorption redshift
  28. GRB021004(=H2380): Revised Localization with HETE Soft X-ray
  29. GRB021004: optical observations at Bisei
  30. GRB 021004: Kyoto observation
  31. GRB021004(=H2380): A Long GRB Localized by HETE in Near-Real Time
  32. GRB021004: Optical Afterglow
  33. GRB 020903: Optical observations at RIKEN
  34. XRF 020903: Archival Optical Images
  35. Radio Observations of XRF 020903: The Missing Link
  36. XRF 020903: Supernova
  37. GRB 020305: HST/STIS observations
  38. XRF 020903: optical observation at Kyoto
  39. GRB020322 : HST/STIS observations
  40. XRF 020903: Optical observations
  41. XRF 020903: Optical observations
  42. XRF 020903, optical observations
  43. GRB020903(=H2314): An X-Ray Flash Localized by HETE
  44. GRB020813: optical observation
  45. GRB020812: optical observation
  46. GRB020819(=H2275): Revised Localization with HETE Soft X-ray
  47. SGR1900+14 burst localized by HETE
  48. GRB020813: High-resolution optical spectroscopy
  49. GRB020819: optical observations at Bisei
  50. GRB020812: negative optical observations
  51. GRB 020812: optical observation at Kyoto University
  52. GRB 020813 : HST observations
  53. GRB020819 : Optical observations at KISO
  54. GRB 020812: early time optical observation at Ouda Station
  55. GRB020813: VRI Decay Slopes
  56. GRB 020819: Optical observations
  57. GRB020819: optical observations
  58. GRB020819(=H2275): A Long Burst Localized by the HETE WXM and SXC
  59. HETE 2275: Optical observations
  60. GRB020813: optical and NIR observations
  61. GRB020813: Fading X-ray Afterglow Observed with Chandra
  62. GRB020813, UBVRI field calibration
  63. GRB 020813: addendum to GCN 1498
  64. GRB020813: optical observations at Bisei
  65. GRB020813: V-band decay slope
  66. Polarimetry of GRB020813: evidence for variability
  67. GRB020812: optical observations
  68. GRB020813: High-Resolution Optical Observations
  69. GRB020813(=H2262): Revised Localization with HETE SXC
  70. GRB 020812: optical observation at Bisei
  71. GRB020813: optical observations; possible host galaxy
  72. GRB 020813, radio detection
  73. GRB 020812 : optical afterglow candidate
  74. GRB020813, optical observations
  75. GRB020812: optical observations
  76. GRB 020813 : KISO multiband optical observations
  77. GRB020813, optical observations
  78. IPN triangulation of GRB020813
  79. Early Time Limits for GRB020813
  80. GRB 020813 multiband optical observations
  81. GRB020813: optical afterglow
  82. GRB020813(=H2262): A Long, Bright Burst Localized by HETE in Near-Real Time
  83. GRB020813: Candidate Optical Afterglow
  84. GRB 020812 optical observation
  85. GRB020812(=H2257): A Long Burst Localized by HETE in Near-Real Time
  86. GRB 020715, optical observations
  87. GRB 020714, optical observations
  88. GRB020801: Imaging of Suggested OT Counterpart at the Magellan
  89. GRB020801, optical afterglow candidate
  90. GRB020331: Late-time Optical Light Curve (re-submission)
  91. GRB020331: Late-time Optical Light Curve
  92. GRB 020410: Discovery of Probable OT by HST
  93. GRB 020124, HST observations of the fading afterglow
  94. GRB 020705: Optical observations
  95. GRB 020625, optical observations
  96. GRB 020625: Optical observations
  97. GRB 020531: optical photometry of Chandra sources
  98. GRB020625 (=H2081): A Long Burst Localized by HETE
  99. HETE #2081: Optical observations
  100. The Probable Host Galaxy of GRB/XRF 020427

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