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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"

32507 results found.

  1. GRB 020819: Optical observations
  2. K band observation of GRB 020819
  3. GRB020819: optical observations
  4. GRB020819(=H2275): A Long Burst Localized by the HETE WXM and SXC
  5. HETE 2275: Optical observations
  6. GRB020813: optical and NIR observations
  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. GRB020812: NIR observations
  12. Polarimetry of GRB020813: evidence for variability
  13. GRB020813 IRAM millimeter observations
  14. GRB020813: High-Resolution Optical Observations
  15. GRB020813(=H2262): Revised Localization with HETE SXC
  16. GRB 020812: optical observation at Bisei
  17. GRB020813: Early Time Magnitude
  18. GRB020813: optical observations; possible host galaxy
  19. GRB 020813, radio detection
  20. GRB020813, optical observations
  21. Millimeter observation of GRB 020813
  22. GRB020812: optical observations
  23. GRB 020813 : KISO multiband optical observations
  24. GRB020813, optical observations
  25. IPN error box for GRB020813
  26. IPN triangulation of GRB020813
  27. GRB020812: possible afterglow candidate
  28. Early Time Limits for GRB020813
  29. GRB020813, astrometric position
  30. Spectropolarimetry of GRB 020813
  31. GRB 020813 Afterglow Observations; Possible break
  32. GRB 020813: Absorption redshift
  33. GRB020813: optical afterglow
  34. GRB020813: Fading of Candidate OT
  35. GRB020813(=H2262): A Long, Bright Burst Localized by HETE in Near-Real Time
  36. GRB020812(=H2257): A Long Burst Localized by HETE in Near-Real Time
  37. GRB 020715, optical observations
  38. GRB 020714, optical observations
  39. GRB020801: Imaging of Suggested OT Counterpart at the Magellan
  40. GRB020801: Candidate OT present in DSS
  41. Further refinement to IPN error box for GRB020531
  42. GRB020331: Late-time Optical Light Curve (re-submission)
  43. GRB020331: Late-time Optical Light Curve
  44. GRB 020405: HST observations reveal red bump
  45. IPN triangulation of GRB020714
  46. IPN triangulation of GRB020715 (=GRB150702)
  47. GRB 020410: Discovery of Probable OT by HST
  48. GRB 020124, HST observations of the fading afterglow
  49. IPN triangulation of GRB020708
  50. IPN triangulation of GRB020708
  51. IPN error box for GRB020706
  52. Correction to IPN error box for GRB020706
  53. IPN triangulation of GRB020706
  54. GRB 020625, optical observations
  55. GRB 020531: optical photometry of Chandra sources
  56. GRB020625 (=H2081): A Long Burst Localized by HETE
  57. The Probable Host Galaxy of GRB/XRF 020427
  58. GRB/XRF 020427, detection of an underlying system with the VLT
  59. SGR-like X-ray Bursts from AXP 1E 2259+586: follow-up
  60. AXP 1E2259+586: quasi-simultaneous optical observation
  61. AXP 1E2259+586 optical observations
  62. Fading Optical Source in the Field of GRB020531
  63. GRB 020531, INT+WFC deep optical upper limits
  64. GRB020405: polarimetric observations
  65. GRB 020531, simultaneous optical observations
  66. GRB 020604, optical observations
  67. GRB 020531/Candidate Redshift
  68. GRB020531: Detection of Candidate Host Galaxy
  69. GRB020531: Second epoch Chandra observations
  70. GRB020604, optical observations
  71. GRB020604, BVRcIc field photometry
  72. GRB020603, BVRcIc field observations
  73. GRB020531, BVRcIc field photometry
  74. GRB020531 Optical observations with TAROT
  75. GRB020531 Optical observations with TAROT
  76. GRB 020531, Radio Observations
  77. GRB020531 Optical Observations
  78. GRB 020603: Optical Observations
  79. GRB 020603, R-band observation
  80. Correction to IPN triangulation of GRB020603 (possible short/hard burst)
  81. GRB020531: Upper Limit for Detection of Two TAROT Sources
  82. GRB 020603: Optical observations
  83. GRB 020531 optical observations with TAROT
  84. Refined IPN error box for GRB020531
  85. GRB020531, optical observations
  86. GRB020531: optical observations
  87. GRB020531(=H2042): Optical Observations
  88. IPN triangulation of the short, hard GRB020531 (=H2042)
  89. GRB020531(=H2042): Optical Observations
  90. GRB020531: Optical observations
  91. GRB020531(=H2042): A Short, Hard Burst Localized by HETE
  92. GRB 020525: Optical Observations
  93. GRB020525, optical observations
  94. IPN detection of possible bursts from SGR1806-20
  95. XRF 020427: Sudden Ionospheric Disturbance (SID)
  96. XRF020427: Chandra Identification of a Likely X-ray Counterpart
  97. GRB/XRF 020427, Radio Observations
  98. HST detection of the likely host galaxy of GRB 020124
  99. GRB020405 field photometry at ESO
  100. XRF020427: Chandra Observations and Candidate X-ray Counterparts

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