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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"

15247 results found.

  1. GRB 021004: Optical observations
  2. GRB021004: Optical Spectroscopy
  3. GRB 021004, SPM optical observations
  4. GRB 021004: radio observations
  5. GRB021004: optical observations at Nyrola
  6. GRB021004(=H2380): Revised Localization with HETE Soft X-ray
  7. GRB021004: optical observations at Bisei
  8. GRB021004(=H2380): A Long GRB Localized by HETE in Near-Real Time
  9. XRF020903: TNG and Asiago photometry
  10. XRF 020903: Correction to GCN 1560
  11. XRF 020903: VRI observations
  12. GRB 020903: correction to GCN 1557
  13. XRF 020903: Archival Optical Images
  14. Radio Observations of XRF 020903: The Missing Link
  15. XRF 020903: Supernova
  16. GRB 020305: HST/STIS observations
  17. IPN GCN Circulars now to be issued without restriction
  18. GRB020903(=H2314): An X-Ray Flash Localized by HETE
  19. GRB020813: optical observation
  20. GRB020812: optical observation
  21. GRB020819(=H2275): Revised Localization with HETE Soft X-ray
  22. GRB020813: High-resolution optical spectroscopy
  23. Second epoch K band imaging of GRB 020819
  24. GRB020813, Baade 6.5m data now available
  25. GRB020819 : Optical observations at KISO
  26. GRB020813: VRI Decay Slopes
  27. GRB 020819 : OT candidate - confirmation of non variability
  28. GRB020819(=H2275): A Long Burst Localized by the HETE WXM and SXC
  29. GRB020813: Fading X-ray Afterglow Observed with Chandra
  30. GRB020813, UBVRI field calibration
  31. GRB020812: NIR observations
  32. GRB020813 IRAM millimeter observations
  33. GRB020813: High-Resolution Optical Observations
  34. GRB020813(=H2262): Revised Localization with HETE SXC
  35. GRB020813: Early Time Magnitude
  36. GRB020813: optical observations; possible host galaxy
  37. GRB 020813, radio detection
  38. GRB 020812 : optical afterglow candidate
  39. GRB020813, optical observations
  40. IPN error box for GRB020813
  41. IPN triangulation of GRB020813
  42. Early Time Limits for GRB020813
  43. GRB020813, astrometric position
  44. GRB 020813 Afterglow Observations; Possible break
  45. GRB 020813 multiband optical observations
  46. GRB020813: optical afterglow
  47. GRB020813: Fading of Candidate OT
  48. GRB020813(=H2262): A Long, Bright Burst Localized by HETE in Near-Real Time
  49. GRB020812(=H2257): A Long Burst Localized by HETE in Near-Real Time
  50. GRB020801: Candidate OT present in DSS
  51. Further refinement to IPN error box for GRB020531
  52. GRB 020124, HST observations of the fading afterglow
  53. GRB020625 (=H2081): A Long Burst Localized by HETE
  54. GRB/XRF 020427, detection of an underlying system with the VLT
  55. Gemini IR Detection of AXP 1E 2259+586 Post-Burst
  56. GRB020405: polarimetric observations
  57. GRB 020531/Candidate Redshift
  58. GRB020531: Second epoch Chandra observations
  59. GRB020604, BVRcIc field photometry
  60. GRB020531: Observations with the Chandra X-ray Observatory
  61. GRB 020603: Optical Observations
  62. GRB020531: Upper Limit for Detection of Two TAROT Sources
  63. GRB020531: optical observations
  64. GRB020531(=H2042): A Short, Hard Burst Localized by HETE
  65. GRB 020525: Optical Observations
  66. GRB020525, optical observations
  67. GRB/XRF 020427, Radio Observations
  68. GRB(XRF) 020427: X-ray afterglow with BeppoSAX
  69. GRB020321 : Optical observations.
  70. GRB020331: Third Epoch and Revised Second Epoch Optical
  71. GRB 020410, Radio Observations
  72. GRB 020124: Optical observations
  73. GRB020405: VLT observations of the OT environment
  74. GRB020410: BeppoSAX NFI observations refined analysis
  75. Mars Odyssey joins the IPN
  76. GRB020405: predicted break
  77. GRB020410: second BeppoSAX NFI observation
  78. GRB 020331 Kyoto observation on March 31
  79. X-ray afterglow of GRB020321
  80. GRB020331: Confirmation of Afterglow Candidate with Magellan
  81. GRB020405: VLT optical observations and V band decay slope
  82. GRB 020321: Candidate X-ray Counterparts
  83. ASM GRB candidate 020406 refined error box
  84. GRB 020405: Moderate-resolution spectroscopy
  85. GRB020331: Optical Observations of Afterglow Candidate
  86. GRB020405: VLT optical observations
  87. Revised Photometry of the Optical Afterglow of GRB 020405
  88. Short RXTE/ASM transient 020406; may be a GRB
  89. GRB020405, Radio Observations
  90. V band observations of GRB020405
  91. GRB020331(=H1963): The "Easter" Burst Detected by HETE
  92. GRB 020322: BeppoSAX observations of the X-ray afterglow
  93. SN 2002ap - peak brightness date (SN/GRB?)
  94. GRB020127: Proposed Host Galaxy Detection and Identification of Afterglow
  95. GRB011211 revised BVRI field photometry
  96. GRB020305 BVRI field photometry
  97. GRB020322 BVRI field photometry
  98. GRB020317 : Near IR Observations from Mt Abu Observatory
  99. GRB 020322: Optical candidate
  100. XMM-Newton observation of GRB020322

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