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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"

42572 results found.

  1. GRB020410: BeppoSAX NFI observations refined analysis
  2. Mars Odyssey joins the IPN
  3. IPN triangulation of GRB020413
  4. GRB020405: predicted break
  5. GRB 020409: Optical observations
  6. GRB020410: second BeppoSAX NFI observation
  7. GRB 020409: No Evidence for an Optical Afterglow
  8. GRB 020409, 2nd epoch optical observations
  9. GRB 020331 Kyoto observation on March 31
  10. GRB 020409
  11. GRB 020409 SARA Observations
  12. GRB "020411"
  13. GRB 020409, No Optical Detection to R = 20
  14. GRB020410: BeppoSAX NFI observation
  15. GRB 020409: Optical observations
  16. April 11 BeppoSAX event (GRB020411) is likely not a GRB
  17. GRB 020410, optical observations
  18. BeppoSAX ALERT: possible GRB020411
  19. GRB 020409, optical observations
  20. GRB 020409: Optical Observations
  21. GRB020406(?), optical observations
  22. GRB020410, optical observations
  23. BeppoSAX ALERT: possible GRB020410
  24. X-ray afterglow of GRB020321
  25. BeppoSAX GRB : GRB020409
  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. Short RXTE/ASM transient 020406; may be a GRB
  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. GRB 020405: Optical afterglow candidate
  46. IPN localization of GRB020405
  47. GRB011212: Optical Observations
  48. GRB 020331: NIR Observations
  49. GRB 020331: NIR Observations
  50. GRB020331 NIR observation at KPNO (re-submission)
  51. GRB02033 NIR observation at KPNO
  52. GRB020331 field photometry
  53. GRB 020331 Optical Observations
  54. GRB 020331, NIR observations
  55. GRB020331(=H1963): The "Easter" Burst Detected by HETE
  56. GRB 020321: Infrared observations
  57. GRB 020322: BeppoSAX observations of the X-ray afterglow
  58. SN 2002ap - peak brightness date (SN/GRB?)
  59. GRB011211: HST Observations of Optical Afterglow and Host Galaxy
  60. Near-Infrared Observations of GRB020322 at TIRGO
  61. GRB 020321, Radio Observations
  62. GRB 020322: Optical Observations
  63. GRB020127: Proposed Host Galaxy Detection and Identification of Afterglow
  64. GRB 020321: Optical observations
  65. GRB020317 BVRI field photometry
  66. GRB011211 revised BVRI field photometry
  67. GRB020305 BVRI field photometry
  68. GRB020322 BVRI field photometry
  69. GRB 020322 optical observations
  70. GRB 020322 optical observation
  71. GRB020317 : Near IR Observations from Mt Abu Observatory
  72. GRB 020322: Optical Sources and Improved Astrometry
  73. GRB020322, optical observations
  74. GRB 020322: Optical candidate
  75. XMM-Newton observation of GRB020322
  76. GRB020322: Optical Observations
  77. GRB020322: BeppoSAX/NFI Observations
  78. Bepposax GRB020322 The second springtime BSAX GRB
  79. GRB 020321: Optical observations
  80. GRB 011121: Fourth Epoch of HST Imaging
  81. GRB020317: optical observations
  82. GRB020321 optical observations
  83. GRB020321: BeppoSAX/NFI Observations
  84. GRB020321: a faint BeppoSAX detection
  85. GRB020305: NIR observations
  86. GRB 020317 : KISO Optical Observations
  87. BeppoSAX ALERT: GRB020321, the "Springtime Burst"
  88. GRB020317 (=H1959): Localization by HETE of a Low Fluence GRB
  89. GRB 020305: Optical Observations
  90. GRB020317, optical observations
  91. GRB 020317: Optical observations
  92. GRB 011121: Third HST Epoch
  93. GRB020305: Properties of the Candidate Optical Afterglow
  94. GRB 011121: HST Observations reveal an intermediate-time multicolor
  95. GRB011121, possible supernova association
  96. GRB011130 (XRF011130) Second Epoch Chandra Observations
  97. GRB020305: Subaru Optical Observations
  98. XRF/GRB 011030 Images
  99. XRF/GRB 011030: Detection of the Probable Host Galaxy
  100. GRB 020305: Candidate optical afterglow

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