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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"

15560 results found.

  1. GRB 020819: Optical observations
  2. GRB020819: optical observations
  3. GRB020819(=H2275): A Long Burst Localized by the HETE WXM and SXC
  4. HETE 2275: Optical observations
  5. GRB020813: optical and NIR observations
  6. GRB020813: Fading X-ray Afterglow Observed with Chandra
  7. GRB020813, UBVRI field calibration
  8. GRB 020813: addendum to GCN 1498
  9. GRB020813: optical observations at Bisei
  10. GRB020813: V-band decay slope
  11. Polarimetry of GRB020813: evidence for variability
  12. GRB020812: optical observations
  13. GRB020813: High-Resolution Optical Observations
  14. GRB020813(=H2262): Revised Localization with HETE SXC
  15. GRB 020812: optical observation at Bisei
  16. GRB020813: optical observations; possible host galaxy
  17. GRB 020813, radio detection
  18. GRB 020812 : optical afterglow candidate
  19. GRB020813, optical observations
  20. GRB020812: optical observations
  21. GRB 020813 : KISO multiband optical observations
  22. GRB020813, optical observations
  23. IPN triangulation of GRB020813
  24. GRB020812: possible afterglow candidate
  25. Early Time Limits for GRB020813
  26. GRB020812: possible afterglow candidate
  27. GRB 020813 multiband optical observations
  28. GRB020813: optical afterglow
  29. GRB020813(=H2262): A Long, Bright Burst Localized by HETE in Near-Real Time
  30. GRB020813: Candidate Optical Afterglow
  31. GRB 020812 optical observation
  32. GRB020812(=H2257): A Long Burst Localized by HETE in Near-Real Time
  33. GRB 020715, optical observations
  34. GRB 020714, optical observations
  35. GRB020801: Imaging of Suggested OT Counterpart at the Magellan
  36. GRB020801, optical afterglow candidate
  37. GRB020331: Late-time Optical Light Curve (re-submission)
  38. GRB020331: Late-time Optical Light Curve
  39. GRB 020410: Discovery of Probable OT by HST
  40. GRB 020124, HST observations of the fading afterglow
  41. GRB 020705: Optical observations
  42. GRB 020625, optical observations
  43. GRB 020625: Optical observations
  44. GRB 020531: optical photometry of Chandra sources
  45. GRB020625 (=H2081): A Long Burst Localized by HETE
  46. HETE #2081: Optical observations
  47. The Probable Host Galaxy of GRB/XRF 020427
  48. Gemini IR Detection of AXP 1E 2259+586 Post-Burst
  49. AXP 1E2259+586: quasi-simultaneous optical observation
  50. AXP 1E2259+586 optical observations
  51. Fading Optical Source in the Field of GRB020531
  52. GRB 020531, INT+WFC deep optical upper limits
  53. GRB020405: polarimetric observations
  54. GRB 020531, simultaneous optical observations
  55. GRB 020604, optical observations
  56. GRB020604, optical observations
  57. GRB020531 Optical observations with TAROT
  58. GRB020531 Optical observations with TAROT
  59. GRB 020418, optical/near-IR observations
  60. GRB020531 Optical Observations
  61. GRB020531: Observations with the Chandra X-ray Observatory
  62. GRB 020603: Optical Observations
  63. GRB 020603: Optical observations
  64. GRB 020531 optical observations with TAROT
  65. GRB020531, optical observations
  66. GRB020531: optical observations
  67. GRB020531, optical observation
  68. GRB020531(=H2042): Optical Observations
  69. GRB020531(=H2042): Optical Observations
  70. GRB020531: Optical observations
  71. GRB020531(=H2042): A Short, Hard Burst Localized by HETE
  72. GRB 020525: Optical Observations
  73. GRB020525, optical observations
  74. HETE Observations of GX354-0 (= MXB1728-34, so-called "Slow
  75. HST detection of the likely host galaxy of GRB 020124
  76. GRB020321 : Optical observations.
  77. GRB020331: Third Epoch and Revised Second Epoch Optical
  78. GRB 020418: Optical observations
  79. GRB 020124: Optical observations
  80. GRB 020418: Optical observations
  81. GRB 020409: Optical Observations
  82. GRB 020409, 2-nd epoch optical observations at Terskol.
  83. GRB 020409: Optical observations
  84. GRB 020409, No Optical Detection to R = 22
  85. GRB 020409: No Evidence for an Optical Afterglow
  86. GRB 020409, 2nd epoch optical observations
  87. GRB 020331 Kyoto observation on March 31
  88. GRB 020409, No Optical Detection to R = 20
  89. GRB 020409: Optical observations
  90. GRB 020410, optical observations
  91. GRB 020409, optical observations
  92. GRB 020409: Optical Observations
  93. GRB020406(?), optical observations
  94. GRB020410, optical observations
  95. X-ray afterglow of GRB020321
  96. GRB020331: Confirmation of Afterglow Candidate with Magellan
  97. GRB020405: VLT optical observations and V band decay slope
  98. GRB020331 optical observations with RIMOTS
  99. GRB020124 optical observations with RIBOTS/RIMOTS
  100. GRB020331: Optical Observations of Afterglow Candidate

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