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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"

16159 results found.

  1. GRB020813: optical observations at Bisei
  2. GRB020813: V-band decay slope
  3. Polarimetry of GRB020813: evidence for variability
  4. GRB020812: optical observations
  5. GRB020813: High-Resolution Optical Observations
  6. GRB020813(=H2262): Revised Localization with HETE SXC
  7. GRB 020812: optical observation at Bisei
  8. GRB020813: optical observations; possible host galaxy
  9. GRB 020813, radio detection
  10. GRB 020812 : optical afterglow candidate
  11. GRB020813, optical observations
  12. GRB020812: optical observations
  13. GRB 020813 : KISO multiband optical observations
  14. GRB020813, optical observations
  15. IPN triangulation of GRB020813
  16. Early Time Limits for GRB020813
  17. GRB 020813 multiband optical observations
  18. GRB020813: optical afterglow
  19. GRB020813(=H2262): A Long, Bright Burst Localized by HETE in Near-Real Time
  20. GRB020813: Candidate Optical Afterglow
  21. GRB 020812 optical observation
  22. GRB020812(=H2257): A Long Burst Localized by HETE in Near-Real Time
  23. GRB 020715, optical observations
  24. GRB 020714, optical observations
  25. GRB020801: Imaging of Suggested OT Counterpart at the Magellan
  26. GRB020801, optical afterglow candidate
  27. GRB020331: Late-time Optical Light Curve (re-submission)
  28. GRB020331: Late-time Optical Light Curve
  29. GRB 020410: Discovery of Probable OT by HST
  30. GRB 020124, HST observations of the fading afterglow
  31. GRB 020705: Optical observations
  32. GRB 020625, optical observations
  33. GRB 020625: Optical observations
  34. GRB 020531: optical photometry of Chandra sources
  35. GRB020625 (=H2081): A Long Burst Localized by HETE
  36. HETE #2081: Optical observations
  37. The Probable Host Galaxy of GRB/XRF 020427
  38. Gemini IR Detection of AXP 1E 2259+586 Post-Burst
  39. AXP 1E2259+586: quasi-simultaneous optical observation
  40. AXP 1E2259+586 optical observations
  41. Fading Optical Source in the Field of GRB020531
  42. GRB 020531, INT+WFC deep optical upper limits
  43. GRB020405: polarimetric observations
  44. GRB 020531, simultaneous optical observations
  45. GRB 020604, optical observations
  46. GRB020604, optical observations
  47. GRB020531 Optical observations with TAROT
  48. GRB020531 Optical observations with TAROT
  49. GRB 020418, optical/near-IR observations
  50. GRB020531 Optical Observations
  51. GRB020531: Observations with the Chandra X-ray Observatory
  52. GRB 020603: Optical Observations
  53. GRB 020603: Optical observations
  54. GRB 020531 optical observations with TAROT
  55. GRB020531, optical observations
  56. GRB020531: optical observations
  57. GRB020531, optical observation
  58. GRB020531(=H2042): Optical Observations
  59. GRB020531(=H2042): Optical Observations
  60. GRB020531: Optical observations
  61. GRB020531(=H2042): A Short, Hard Burst Localized by HETE
  62. GRB 020525: Optical Observations
  63. GRB020525, optical observations
  64. HETE Observations of GX354-0 (= MXB1728-34, so-called "Slow
  65. HST detection of the likely host galaxy of GRB 020124
  66. GRB020321 : Optical observations.
  67. GRB020331: Third Epoch and Revised Second Epoch Optical
  68. The end of BSAX GRB activities
  69. GRB 020418: Optical observations
  70. GRB 020124: Optical observations
  71. GRB 020418: Optical observations
  72. GRB 020409: Optical Observations
  73. GRB 020409, 2-nd epoch optical observations at Terskol.
  74. GRB 020409: Optical observations
  75. GRB 020409, No Optical Detection to R = 22
  76. GRB 020409: No Evidence for an Optical Afterglow
  77. GRB 020409, 2nd epoch optical observations
  78. GRB 020331 Kyoto observation on March 31
  79. GRB 020409, No Optical Detection to R = 20
  80. GRB 020409: Optical observations
  81. GRB 020410, optical observations
  82. GRB 020409, optical observations
  83. GRB 020409: Optical Observations
  84. GRB020406(?), optical observations
  85. GRB020410, optical observations
  86. X-ray afterglow of GRB020321
  87. GRB020331: Confirmation of Afterglow Candidate with Magellan
  88. GRB020405: VLT optical observations and V band decay slope
  89. GRB020331 optical observations with RIMOTS
  90. GRB020124 optical observations with RIBOTS/RIMOTS
  91. GRB020331: Optical Observations of Afterglow Candidate
  92. GRB020406(?), optical observations
  93. GRB020405: VLT optical observations
  94. Revised Photometry of the Optical Afterglow of GRB 020405
  95. GRB 020331: Candidate Optical Afterglow
  96. GRB 020405: Decay index
  97. GRB020405, Radio Observations
  98. Fading Optical Afterglow and Possible Host Galaxy of GRB 020405
  99. GRB 020405, U-band observations
  100. GRB 020405: Optical afterglow candidate

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