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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"

18334 results found.

  1. GRB 020531, INT+WFC deep optical upper limits
  2. GRB020405: polarimetric observations
  3. GRB 020531, simultaneous optical observations
  4. GRB 020604, optical observations
  5. GRB020531: Second epoch Chandra observations
  6. GRB020604, optical observations
  7. GRB020604, BVRcIc field photometry
  8. GRB020603, BVRcIc field observations
  9. GRB020531, BVRcIc field photometry
  10. GRB020531 Optical Observations
  11. GRB020531: Observations with the Chandra X-ray Observatory
  12. GRB020531, optical observations
  13. GRB020531(=H2042): Optical Observations
  14. GRB020531(=H2042): Optical Observations
  15. GRB020525, optical observations
  16. GRB020405 field photometry at ESO
  17. XRF020427: Chandra Observations and Candidate X-ray Counterparts
  18. GRB(XRF) 020427: X-ray afterglow with BeppoSAX
  19. XRF 020427
  20. GRB 020124: Optical observations
  21. GRB020405: VLT observations of the OT environment
  22. GRB 020409: No Evidence for an Optical Afterglow
  23. GRB 020331 Kyoto observation on March 31
  24. X-ray afterglow of GRB020321
  25. BeppoSAX GRB : GRB020409
  26. GRB020331 optical observations with RIMOTS
  27. GRB020124 optical observations with RIBOTS/RIMOTS
  28. GRB020406(?), optical observations
  29. GRB020405, Radio Observations
  30. GRB 020405, U-band observations
  31. GRB020331 NIR observation at KPNO (re-submission)
  32. GRB02033 NIR observation at KPNO
  33. GRB020331 field photometry
  34. GRB 020331, NIR observations
  35. GRB020331(=H1963): The "Easter" Burst Detected by HETE
  36. GRB 020322: BeppoSAX observations of the X-ray afterglow
  37. GRB011211: HST Observations of Optical Afterglow and Host Galaxy
  38. Near-Infrared Observations of GRB020322 at TIRGO
  39. GRB 020322: Optical Observations
  40. GRB020127: Proposed Host Galaxy Detection and Identification of Afterglow
  41. GRB 020321: Optical observations
  42. GRB020317 BVRI field photometry
  43. GRB011211 revised BVRI field photometry
  44. GRB020305 BVRI field photometry
  45. GRB020322 BVRI field photometry
  46. GRB020322: Candidate Optical Afterglow
  47. GRB 020322: Optical Sources and Improved Astrometry
  48. GRB020317: optical observations
  49. GRB020321 optical observations
  50. GRB020321: a faint BeppoSAX detection
  51. GRB 020317 : KISO Optical Observations
  52. GRB020317 (=H1959): Localization by HETE of a Low Fluence GRB
  53. GRB 020305: Optical Observations
  54. GRB020317, optical observations
  55. GRB 020317: Optical observations
  56. GRB020305: Properties of the Candidate Optical Afterglow
  57. GRB011130 (XRF011130) Second Epoch Chandra Observations
  58. GRB 020305: Optical observations
  59. XRF/GRB 011030: Detection of the Probable Host Galaxy
  60. GRB 020305: Candidate optical afterglow
  61. GRB020305, optical observations
  62. HST Imaging of the afterglow and host of GRB 011121
  63. GRB 010921: HST Observations
  64. SGR1900+14 activity
  65. GRB020124 BVRI field photometry
  66. GRB020127 Optical Observations
  67. SN2002ap (SN/GRB?) UBVRI Field Photometry
  68. GRB020127: Chandra Observations and Prospective Counterparts
  69. pre-SN2002ap (SN/GRB?) imaging of M74
  70. GRB020124, optical observations
  71. GRB 020127, I-band observations starting 3.14-hr after the event
  72. GRB010921 Optical Observations
  73. GRB020127(=H1902): Localization of a Double-Peaked GRB by HETE
  74. GRB020124: Optical observations
  75. GRB020124: Optical observations
  76. GRB 020124: Optical observations
  77. GRB 020124: Optical afterglow
  78. GRB020124(=H1896): Localization of a Long GRB by HETE
  79. Possible optical counterpart to a GRB
  80. GRB011212, Optical Observations
  81. Optical polarization observations for GRB011211
  82. GRB 011130: Optical Observations of X-ray and Radio Sources
  83. GRB 011130, Radio/X-ray Comparison
  84. GRB 011212: optical observation at Asiago
  85. GRB 011211: Evidence for an Optical Break
  86. GRB 011212: optical observation at Oslo (relayed)
  87. GRB 011211, Optical Observations
  88. GRB011212, BVRI field photometry
  89. GRB011211, BVRI field photometry
  90. Fading of the optical source associated of XRF 011211
  91. GRB011130 (=XRF011130): Further analysis of Chandra Target of
  92. GRB011130 (XRF011130) Chandra Observations
  93. GRB011130 (=XRF011130): Scheduled Target of Opportunity
  94. GRB 011130, K band observations
  95. GRB011130 (XRF011130) SDSS PT i-band observations
  96. XRF011130: Infrared Observations
  97. GRB 011121: J-band observations
  98. GRB 011121: NIR observations, host galaxy?
  99. GRB011121: UBRI Observations
  100. GRB 011121 J-Band Astrometry

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