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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"

32501 results found.

  1. GRB020813, UBVRI field calibration
  2. GRB 020813: addendum to GCN 1498
  3. GRB020813: optical observations at Bisei
  4. GRB020813: V-band decay slope
  5. GRB020812: NIR observations
  6. Polarimetry of GRB020813: evidence for variability
  7. GRB020813 IRAM millimeter observations
  8. GRB020813: High-Resolution Optical Observations
  9. GRB020813(=H2262): Revised Localization with HETE SXC
  10. GRB 020812: optical observation at Bisei
  11. GRB020813: Early Time Magnitude
  12. GRB020813: optical observations; possible host galaxy
  13. GRB 020813, radio detection
  14. GRB020813, optical observations
  15. Millimeter observation of GRB 020813
  16. GRB020812: optical observations
  17. GRB 020813 : KISO multiband optical observations
  18. GRB020813, optical observations
  19. IPN error box for GRB020813
  20. IPN triangulation of GRB020813
  21. GRB020812: possible afterglow candidate
  22. Early Time Limits for GRB020813
  23. GRB020813, astrometric position
  24. Spectropolarimetry of GRB 020813
  25. GRB 020813 Afterglow Observations; Possible break
  26. GRB 020813: Absorption redshift
  27. GRB020813: optical afterglow
  28. GRB020813: Fading of Candidate OT
  29. GRB020813(=H2262): A Long, Bright Burst Localized by HETE in Near-Real Time
  30. GRB020812(=H2257): A Long Burst Localized by HETE in Near-Real Time
  31. GRB 020715, optical observations
  32. GRB 020714, optical observations
  33. GRB020801: Imaging of Suggested OT Counterpart at the Magellan
  34. GRB020801: Candidate OT present in DSS
  35. Further refinement to IPN error box for GRB020531
  36. GRB020331: Late-time Optical Light Curve (re-submission)
  37. GRB020331: Late-time Optical Light Curve
  38. GRB 020405: HST observations reveal red bump
  39. IPN triangulation of GRB020714
  40. IPN triangulation of GRB020715 (=GRB150702)
  41. GRB 020410: Discovery of Probable OT by HST
  42. GRB 020124, HST observations of the fading afterglow
  43. IPN triangulation of GRB020708
  44. IPN triangulation of GRB020708
  45. IPN error box for GRB020706
  46. Correction to IPN error box for GRB020706
  47. IPN triangulation of GRB020706
  48. GRB 020625, optical observations
  49. GRB 020531: optical photometry of Chandra sources
  50. GRB020625 (=H2081): A Long Burst Localized by HETE
  51. The Probable Host Galaxy of GRB/XRF 020427
  52. GRB/XRF 020427, detection of an underlying system with the VLT
  53. SGR-like X-ray Bursts from AXP 1E 2259+586: follow-up
  54. AXP 1E2259+586: quasi-simultaneous optical observation
  55. AXP 1E2259+586 optical observations
  56. Fading Optical Source in the Field of GRB020531
  57. GRB 020531, INT+WFC deep optical upper limits
  58. GRB020405: polarimetric observations
  59. GRB 020531, simultaneous optical observations
  60. GRB 020604, optical observations
  61. GRB 020531/Candidate Redshift
  62. GRB020531: Detection of Candidate Host Galaxy
  63. GRB020531: Second epoch Chandra observations
  64. GRB020604, optical observations
  65. GRB020604, BVRcIc field photometry
  66. GRB020603, BVRcIc field observations
  67. GRB020531, BVRcIc field photometry
  68. GRB020531 Optical observations with TAROT
  69. GRB020531 Optical observations with TAROT
  70. GRB 020531, Radio Observations
  71. GRB020531 Optical Observations
  72. GRB 020603: Optical Observations
  73. GRB 020603, R-band observation
  74. Correction to IPN triangulation of GRB020603 (possible short/hard burst)
  75. GRB020531: Upper Limit for Detection of Two TAROT Sources
  76. GRB 020603: Optical observations
  77. GRB 020531 optical observations with TAROT
  78. Refined IPN error box for GRB020531
  79. GRB020531, optical observations
  80. GRB020531: optical observations
  81. GRB020531(=H2042): Optical Observations
  82. IPN triangulation of the short, hard GRB020531 (=H2042)
  83. GRB020531(=H2042): Optical Observations
  84. GRB020531: Optical observations
  85. GRB020531(=H2042): A Short, Hard Burst Localized by HETE
  86. GRB 020525: Optical Observations
  87. GRB020525, optical observations
  88. IPN detection of possible bursts from SGR1806-20
  89. XRF 020427: Sudden Ionospheric Disturbance (SID)
  90. XRF020427: Chandra Identification of a Likely X-ray Counterpart
  91. GRB/XRF 020427, Radio Observations
  92. HST detection of the likely host galaxy of GRB 020124
  93. GRB020405 field photometry at ESO
  94. XRF020427: Chandra Observations and Candidate X-ray Counterparts
  95. GRB(XRF) 020427: X-ray afterglow with BeppoSAX
  96. GRB020321 : Optical observations.
  97. GRB020331: Third Epoch and Revised Second Epoch Optical
  98. GRB 020410, Radio Observations
  99. GRB 020418: Optical observations
  100. GRB 020124: Optical observations

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