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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"

32506 results found.

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

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