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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"

32503 results found.

  1. GRB 020418: Optical observations
  2. GRB 020124: Optical observations
  3. GRB 020418: Optical observations
  4. GRB020405: VLT observations of the OT environment
  5. GRB020410: BeppoSAX NFI observations refined analysis
  6. GRB 020409: Optical Observations
  7. Mars Odyssey joins the IPN
  8. GRB 020409, 2-nd epoch optical observations at Terskol.
  9. GRB020405: predicted break
  10. GRB 020409: Optical observations
  11. GRB 020409, No Optical Detection to R = 22
  12. GRB 020409: No Evidence for an Optical Afterglow
  13. GRB 020409, 2nd epoch optical observations
  14. GRB 020331 Kyoto observation on March 31
  15. GRB 020409, No Optical Detection to R = 20
  16. GRB 020409: Optical observations
  17. GRB 020410, optical observations
  18. GRB 020409, optical observations
  19. GRB 020409: Optical Observations
  20. GRB020406(?), optical observations
  21. X-ray afterglow of GRB020321
  22. GRB020331: Confirmation of Afterglow Candidate with Magellan
  23. GRB020405: VLT optical observations and V band decay slope
  24. GRB020331 optical observations with RIMOTS
  25. GRB020124 optical observations with RIBOTS/RIMOTS
  26. GRB 020321: Candidate X-ray Counterparts
  27. ASM GRB candidate 020406 refined error box
  28. GRB 020405: Moderate-resolution spectroscopy
  29. GRB020331: Optical Observations of Afterglow Candidate
  30. GRB020406(?), optical observations
  31. GRB020405: VLT optical observations
  32. Revised Photometry of the Optical Afterglow of GRB 020405
  33. GRB020405: OT observations
  34. GRB 020331: Candidate Optical Afterglow
  35. GRB 020405: Decay index
  36. GRB020405, Radio Observations
  37. GRB020405: VLT spectroscopy
  38. Fading Optical Afterglow and Possible Host Galaxy of GRB 020405
  39. V band observations of GRB020405
  40. GRB 020405, U-band observations
  41. IPN localization of GRB020405
  42. GRB011212: Optical Observations
  43. GRB 020331: NIR Observations
  44. GRB 020331: NIR Observations
  45. GRB020331 field photometry
  46. GRB 020331, NIR observations
  47. GRB 020331: Optical observations
  48. GRB020331(=H1963): The "Easter" Burst Detected by HETE
  49. GRB 020321: Infrared observations
  50. GRB 020322: BeppoSAX observations of the X-ray afterglow
  51. SN 2002ap - peak brightness date (SN/GRB?)
  52. GRB011211: HST Observations of Optical Afterglow and Host Galaxy
  53. GRB 020322, Radio observations
  54. Near-Infrared Observations of GRB020322 at TIRGO
  55. GRB 020321, Radio Observations
  56. GRB 020322: Optical Observations
  57. GRB020127: Proposed Host Galaxy Detection and Identification of Afterglow
  58. GRB 020321: Optical observations
  59. GRB020317 BVRI field photometry
  60. GRB011211 revised BVRI field photometry
  61. GRB020305 BVRI field photometry
  62. GRB020322 BVRI field photometry
  63. GRB 020322 optical observations
  64. GRB020322: Candidate Optical Afterglow
  65. GRB 020322 optical observation
  66. GRB 020322: Optical Sources and Improved Astrometry
  67. GRB020322, optical observations
  68. GRB 020322: Optical candidate
  69. XMM-Newton observation of GRB020322
  70. GRB020322: Optical Observations
  71. GRB 020321: Optical observations
  72. GRB 011121: Fourth Epoch of HST Imaging
  73. GRB020317: optical observations
  74. GRB020321 optical observations
  75. GRB020305: NIR observations
  76. GRB 020317 : KISO Optical Observations
  77. GRB020317 (=H1959): Localization by HETE of a Low Fluence GRB
  78. GRB 020305: Optical Observations
  79. GRB020317, optical observations
  80. GRB 011121: Third HST Epoch
  81. GRB020305: Properties of the Candidate Optical Afterglow
  82. GRB 011121: HST Observations reveal an intermediate-time multicolor
  83. GRB011121, possible supernova association
  84. GRB011130 (XRF011130) Second Epoch Chandra Observations
  85. GRB020305: Subaru Optical Observations
  86. GRB 020305: Optical observations
  87. XRF/GRB 011030 Images
  88. XRF/GRB 011030: Detection of the Probable Host Galaxy
  89. GRB 020305: Candidate optical afterglow
  90. Type Ic SN2002bl (SN/GRB?) Radio Observations
  91. GRB020305 (=H1939): Localization of a GRB by HETE
  92. HST Imaging of the afterglow and host of GRB 011121
  93. GRB 010921: HST Observations
  94. GRB020127: Further VLA Observations of Possible Counterparts
  95. IPN detection of further SGR1900+14 activity
  96. SGR1900+14 activity
  97. GRB020124 BVRI field photometry
  98. GRB020127: Palomar and VLA Observations of Possible Counterparts
  99. GRB020127, WSRT radio observations
  100. GRB020127 Optical Observations

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