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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"

17850 results found.

  1. GRB020801, optical afterglow candidate
  2. Further refinement to IPN error box for GRB020531
  3. GRB020331: Late-time Optical Light Curve (re-submission)
  4. GRB020331: Late-time Optical Light Curve
  5. GRB 020410: Discovery of Probable OT by HST
  6. IPN triangulation of GRB020708
  7. GRB 020705: Optical observations
  8. GRB 020625, optical observations
  9. GRB 020625: Optical observations
  10. GRB 020531: optical photometry of Chandra sources
  11. GRB020625 (=H2081): A Long Burst Localized by HETE
  12. The Probable Host Galaxy of GRB/XRF 020427
  13. GRB/XRF 020427, detection of an underlying system with the VLT
  14. Gemini IR Detection of AXP 1E 2259+586 Post-Burst
  15. AXP 1E2259+586 optical observations
  16. Fading Optical Source in the Field of GRB020531
  17. GRB 020531, INT+WFC deep optical upper limits
  18. GRB020405: polarimetric observations
  19. GRB 020531, simultaneous optical observations
  20. GRB 020604, optical observations
  21. GRB020531: Second epoch Chandra observations
  22. GRB020604, optical observations
  23. GRB020604, BVRcIc field photometry
  24. GRB020603, BVRcIc field observations
  25. GRB020531, BVRcIc field photometry
  26. GRB020531 Optical Observations
  27. GRB020531: Observations with the Chandra X-ray Observatory
  28. GRB020531, optical observations
  29. GRB020531(=H2042): Optical Observations
  30. GRB020531(=H2042): Optical Observations
  31. GRB020525, optical observations
  32. GRB020405 field photometry at ESO
  33. XRF020427: Chandra Observations and Candidate X-ray Counterparts
  34. GRB(XRF) 020427: X-ray afterglow with BeppoSAX
  35. XRF 020427
  36. GRB 020124: Optical observations
  37. GRB020405: VLT observations of the OT environment
  38. GRB 020409: No Evidence for an Optical Afterglow
  39. GRB 020331 Kyoto observation on March 31
  40. X-ray afterglow of GRB020321
  41. BeppoSAX GRB : GRB020409
  42. GRB020331 optical observations with RIMOTS
  43. GRB020124 optical observations with RIBOTS/RIMOTS
  44. GRB020406(?), optical observations
  45. GRB020405, Radio Observations
  46. GRB 020405, U-band observations
  47. GRB020331 NIR observation at KPNO (re-submission)
  48. GRB02033 NIR observation at KPNO
  49. GRB020331 field photometry
  50. GRB 020331, NIR observations
  51. GRB020331(=H1963): The "Easter" Burst Detected by HETE
  52. GRB 020322: BeppoSAX observations of the X-ray afterglow
  53. GRB011211: HST Observations of Optical Afterglow and Host Galaxy
  54. Near-Infrared Observations of GRB020322 at TIRGO
  55. GRB 020322: Optical Observations
  56. GRB020127: Proposed Host Galaxy Detection and Identification of Afterglow
  57. GRB 020321: Optical observations
  58. GRB020317 BVRI field photometry
  59. GRB011211 revised BVRI field photometry
  60. GRB020305 BVRI field photometry
  61. GRB020322 BVRI field photometry
  62. GRB020322: Candidate Optical Afterglow
  63. GRB 020322: Optical Sources and Improved Astrometry
  64. GRB020317: optical observations
  65. GRB020321 optical observations
  66. GRB020321: a faint BeppoSAX detection
  67. GRB 020317 : KISO Optical Observations
  68. GRB020317 (=H1959): Localization by HETE of a Low Fluence GRB
  69. GRB 020305: Optical Observations
  70. GRB020317, optical observations
  71. GRB 020317: Optical observations
  72. GRB020305: Properties of the Candidate Optical Afterglow
  73. GRB011130 (XRF011130) Second Epoch Chandra Observations
  74. GRB 020305: Optical observations
  75. XRF/GRB 011030: Detection of the Probable Host Galaxy
  76. GRB 020305: Candidate optical afterglow
  77. GRB020305, optical observations
  78. HST Imaging of the afterglow and host of GRB 011121
  79. GRB 010921: HST Observations
  80. SGR1900+14 activity
  81. GRB020124 BVRI field photometry
  82. GRB020127 Optical Observations
  83. SN2002ap (SN/GRB?) UBVRI Field Photometry
  84. GRB020127: Chandra Observations and Prospective Counterparts
  85. pre-SN2002ap (SN/GRB?) imaging of M74
  86. GRB020124, optical observations
  87. GRB 020127, I-band observations starting 3.14-hr after the event
  88. GRB010921 Optical Observations
  89. GRB020127(=H1902): Localization of a Double-Peaked GRB by HETE
  90. GRB020124: Optical observations
  91. GRB020124: Optical observations
  92. GRB 020124: Optical observations
  93. GRB 020124: Optical afterglow
  94. GRB020124(=H1896): Localization of a Long GRB by HETE
  95. Possible optical counterpart to a GRB
  96. GRB011212, Optical Observations
  97. Optical polarization observations for GRB011211
  98. GRB 011130: Optical Observations of X-ray and Radio Sources
  99. GRB 011130, Radio/X-ray Comparison
  100. GRB 011212: optical observation at Asiago

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