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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"

32507 results found.

  1. GRB(XRF) 020427: X-ray afterglow with BeppoSAX
  2. GRB020321 : Optical observations.
  3. GRB020331: Third Epoch and Revised Second Epoch Optical
  4. GRB 020410, Radio Observations
  5. GRB 020418: Optical observations
  6. GRB 020124: Optical observations
  7. GRB 020418: Optical observations
  8. GRB020405: VLT observations of the OT environment
  9. GRB020410: BeppoSAX NFI observations refined analysis
  10. GRB 020409: Optical Observations
  11. Mars Odyssey joins the IPN
  12. GRB 020409, 2-nd epoch optical observations at Terskol.
  13. GRB020405: predicted break
  14. GRB 020409: Optical observations
  15. GRB 020409, No Optical Detection to R = 22
  16. GRB 020409: No Evidence for an Optical Afterglow
  17. GRB 020409, 2nd epoch optical observations
  18. GRB 020331 Kyoto observation on March 31
  19. GRB 020409, No Optical Detection to R = 20
  20. GRB 020409: Optical observations
  21. GRB 020410, optical observations
  22. GRB 020409, optical observations
  23. GRB 020409: Optical Observations
  24. GRB020406(?), optical observations
  25. X-ray afterglow of GRB020321
  26. GRB020331: Confirmation of Afterglow Candidate with Magellan
  27. GRB020405: VLT optical observations and V band decay slope
  28. GRB020331 optical observations with RIMOTS
  29. GRB020124 optical observations with RIBOTS/RIMOTS
  30. GRB 020321: Candidate X-ray Counterparts
  31. ASM GRB candidate 020406 refined error box
  32. GRB 020405: Moderate-resolution spectroscopy
  33. GRB020331: Optical Observations of Afterglow Candidate
  34. GRB020406(?), optical observations
  35. GRB020405: VLT optical observations
  36. Revised Photometry of the Optical Afterglow of GRB 020405
  37. GRB020405: OT observations
  38. GRB 020331: Candidate Optical Afterglow
  39. GRB 020405: Decay index
  40. GRB020405, Radio Observations
  41. GRB020405: VLT spectroscopy
  42. Fading Optical Afterglow and Possible Host Galaxy of GRB 020405
  43. V band observations of GRB020405
  44. GRB 020405, U-band observations
  45. IPN localization of GRB020405
  46. GRB011212: Optical Observations
  47. GRB 020331: NIR Observations
  48. GRB 020331: NIR Observations
  49. GRB020331 field photometry
  50. GRB 020331, NIR observations
  51. GRB 020331: Optical observations
  52. GRB020331(=H1963): The "Easter" Burst Detected by HETE
  53. GRB 020321: Infrared observations
  54. GRB 020322: BeppoSAX observations of the X-ray afterglow
  55. SN 2002ap - peak brightness date (SN/GRB?)
  56. GRB011211: HST Observations of Optical Afterglow and Host Galaxy
  57. GRB 020322, Radio observations
  58. Near-Infrared Observations of GRB020322 at TIRGO
  59. GRB 020321, Radio Observations
  60. GRB 020322: Optical Observations
  61. GRB020127: Proposed Host Galaxy Detection and Identification of Afterglow
  62. GRB 020321: Optical observations
  63. GRB020317 BVRI field photometry
  64. GRB011211 revised BVRI field photometry
  65. GRB020305 BVRI field photometry
  66. GRB020322 BVRI field photometry
  67. GRB 020322 optical observations
  68. GRB020322: Candidate Optical Afterglow
  69. GRB 020322 optical observation
  70. GRB 020322: Optical Sources and Improved Astrometry
  71. GRB020322, optical observations
  72. GRB 020322: Optical candidate
  73. XMM-Newton observation of GRB020322
  74. GRB020322: Optical Observations
  75. GRB 020321: Optical observations
  76. GRB 011121: Fourth Epoch of HST Imaging
  77. GRB020317: optical observations
  78. GRB020321 optical observations
  79. GRB020305: NIR observations
  80. GRB 020317 : KISO Optical Observations
  81. GRB020317 (=H1959): Localization by HETE of a Low Fluence GRB
  82. GRB 020305: Optical Observations
  83. GRB020317, optical observations
  84. GRB 011121: Third HST Epoch
  85. GRB020305: Properties of the Candidate Optical Afterglow
  86. GRB 011121: HST Observations reveal an intermediate-time multicolor
  87. GRB011121, possible supernova association
  88. GRB011130 (XRF011130) Second Epoch Chandra Observations
  89. GRB020305: Subaru Optical Observations
  90. GRB 020305: Optical observations
  91. XRF/GRB 011030 Images
  92. XRF/GRB 011030: Detection of the Probable Host Galaxy
  93. GRB 020305: Candidate optical afterglow
  94. Type Ic SN2002bl (SN/GRB?) Radio Observations
  95. GRB020305 (=H1939): Localization of a GRB by HETE
  96. HST Imaging of the afterglow and host of GRB 011121
  97. GRB 010921: HST Observations
  98. GRB020127: Further VLA Observations of Possible Counterparts
  99. IPN detection of further SGR1900+14 activity
  100. SGR1900+14 activity

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