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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"

42786 results found.

  1. GRB020331: Third Epoch and Revised Second Epoch Optical
  2. The end of BSAX GRB activities
  3. GRB 020410, Radio Observations
  4. GRB 020418: Optical observations
  5. GRB 020124: Optical observations
  6. GRB 020418: Optical observations
  7. IPN triangulation of GRB020418
  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. IPN triangulation of GRB020413
  13. GRB 020409, 2-nd epoch optical observations at Terskol.
  14. GRB020405: predicted break
  15. GRB 020409: Optical observations
  16. GRB 020409, No Optical Detection to R = 22
  17. GRB020410: second BeppoSAX NFI observation
  18. GRB 020409: No Evidence for an Optical Afterglow
  19. GRB 020331 Kyoto observation on March 31
  20. GRB 020409
  21. GRB 020409, No Optical Detection to R = 20
  22. April 11 BeppoSAX event (GRB020411) is likely not a GRB
  23. GRB 020410, optical observations
  24. GRB020406(?), optical observations
  25. GRB020410, optical observations
  26. BeppoSAX ALERT: possible GRB020410
  27. X-ray afterglow of GRB020321
  28. BeppoSAX GRB : GRB020409
  29. GRB020331: Confirmation of Afterglow Candidate with Magellan
  30. GRB020405: VLT optical observations and V band decay slope
  31. GRB020331 optical observations with RIMOTS
  32. GRB020124 optical observations with RIBOTS/RIMOTS
  33. GRB 020321: Candidate X-ray Counterparts
  34. ASM GRB candidate 020406 refined error box
  35. GRB 020405: Moderate-resolution spectroscopy
  36. GRB020331: Optical Observations of Afterglow Candidate
  37. GRB020406(?), optical observations
  38. GRB020405: VLT optical observations
  39. Revised Photometry of the Optical Afterglow of GRB 020405
  40. GRB020405: OT observations
  41. GRB 020331: Candidate Optical Afterglow
  42. GRB 020405: Decay index
  43. Short RXTE/ASM transient 020406; may be a GRB
  44. GRB020405, Radio Observations
  45. GRB020405: VLT spectroscopy
  46. Fading Optical Afterglow and Possible Host Galaxy of GRB 020405
  47. V band observations of GRB020405
  48. GRB 020405, U-band observations
  49. GRB 020405: Optical afterglow candidate
  50. IPN localization of GRB020405
  51. GRB011212: Optical Observations
  52. GRB 020331: NIR Observations
  53. GRB 020331: NIR Observations
  54. GRB020331 NIR observation at KPNO (re-submission)
  55. GRB02033 NIR observation at KPNO
  56. GRB020331 field photometry
  57. GRB 020331 Optical Observations
  58. GRB 020331, NIR observations
  59. GRB 020331: Optical observations
  60. GRB020331(=H1963): The "Easter" Burst Detected by HETE
  61. GRB 020321: Infrared observations
  62. GRB 020322: BeppoSAX observations of the X-ray afterglow
  63. SN 2002ap - peak brightness date (SN/GRB?)
  64. GRB011211: HST Observations of Optical Afterglow and Host Galaxy
  65. GRB 020322, Radio observations
  66. Near-Infrared Observations of GRB020322 at TIRGO
  67. GRB 020321, Radio Observations
  68. GRB 020322: Optical Observations
  69. GRB020127: Proposed Host Galaxy Detection and Identification of Afterglow
  70. GRB 020321: Optical observations
  71. GRB020317 BVRI field photometry
  72. GRB011211 revised BVRI field photometry
  73. GRB020305 BVRI field photometry
  74. GRB020322 BVRI field photometry
  75. GRB 020322 optical observations
  76. GRB020322: Candidate Optical Afterglow
  77. GRB 020322 optical observation
  78. GRB020317 : Near IR Observations from Mt Abu Observatory
  79. GRB 020322: Optical Sources and Improved Astrometry
  80. GRB020322, optical observations
  81. GRB 020322: Optical candidate
  82. XMM-Newton observation of GRB020322
  83. GRB020322: Optical Observations
  84. GRB 011121: Fourth Epoch of HST Imaging
  85. GRB020317: optical observations
  86. GRB020321 optical observations
  87. GRB020321: BeppoSAX/NFI Observations
  88. GRB020321: a faint BeppoSAX detection
  89. GRB020305: NIR observations
  90. GRB 020317 : KISO Optical Observations
  91. GRB020317 (=H1959): Localization by HETE of a Low Fluence GRB
  92. GRB 020305: Optical Observations
  93. GRB020317, optical observations
  94. GRB 020317: Optical observations
  95. GRB 011121: Third HST Epoch
  96. GRB020305: Properties of the Candidate Optical Afterglow
  97. GRB 011121: HST Observations reveal an intermediate-time multicolor
  98. GRB011121, possible supernova association
  99. GRB011130 (XRF011130) Second Epoch Chandra Observations
  100. GRB020305: Subaru Optical Observations

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