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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"

45162 results found.

  1. GRB 020409: No Evidence for an Optical Afterglow
  2. GRB 020409, 2nd epoch optical observations
  3. GRB 020331 Kyoto observation on March 31
  4. GRB 020409
  5. GRB 020409 SARA Observations
  6. GRB "020411"
  7. GRB 020409, No Optical Detection to R = 20
  8. GRB020410: BeppoSAX NFI observation
  9. GRB 020409: Optical observations
  10. April 11 BeppoSAX event (GRB020411) is likely not a GRB
  11. GRB 020410, optical observations
  12. BeppoSAX ALERT: possible GRB020411
  13. GRB 020409, optical observations
  14. GRB 020409: Optical Observations
  15. GRB020406(?), optical observations
  16. GRB020410, optical observations
  17. BeppoSAX ALERT: possible GRB020410
  18. X-ray afterglow of GRB020321
  19. BeppoSAX GRB : GRB020409
  20. GRB020331: Confirmation of Afterglow Candidate with Magellan
  21. GRB020405: VLT optical observations and V band decay slope
  22. GRB020331 optical observations with RIMOTS
  23. GRB020124 optical observations with RIBOTS/RIMOTS
  24. GRB 020321: Candidate X-ray Counterparts
  25. ASM GRB candidate 020406 refined error box
  26. GRB 020405: Moderate-resolution spectroscopy
  27. GRB020331: Optical Observations of Afterglow Candidate
  28. GRB020406(?), optical observations
  29. GRB020405: VLT optical observations
  30. Revised Photometry of the Optical Afterglow of GRB 020405
  31. GRB020405: OT observations
  32. GRB 020331: Candidate Optical Afterglow
  33. GRB 020405: Decay index
  34. Short RXTE/ASM transient 020406; may be a GRB
  35. GRB020405, Radio Observations
  36. GRB020405: VLT spectroscopy
  37. Fading Optical Afterglow and Possible Host Galaxy of GRB 020405
  38. V band observations of GRB020405
  39. GRB 020405, U-band observations
  40. GRB 020405: Optical afterglow candidate
  41. IPN localization of GRB020405
  42. GRB011212: Optical Observations
  43. GRB 020331: NIR Observations
  44. GRB 020331: NIR Observations
  45. GRB020331 NIR observation at KPNO (re-submission)
  46. GRB02033 NIR observation at KPNO
  47. GRB020331 field photometry
  48. GRB 020331 Optical Observations
  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. GRB020317 : Near IR Observations from Mt Abu Observatory
  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. GRB020322: BeppoSAX/NFI Observations
  76. Bepposax GRB020322 The second springtime BSAX GRB
  77. GRB 020321: Optical observations
  78. GRB 011121: Fourth Epoch of HST Imaging
  79. GRB020317: optical observations
  80. GRB020321 optical observations
  81. GRB020321: BeppoSAX/NFI Observations
  82. GRB020321: a faint BeppoSAX detection
  83. GRB020305: NIR observations
  84. GRB 020317 : KISO Optical Observations
  85. BeppoSAX ALERT: GRB020321, the "Springtime Burst"
  86. GRB020317 (=H1959): Localization by HETE of a Low Fluence GRB
  87. GRB 020305: Optical Observations
  88. GRB020317, optical observations
  89. GRB 020317: Optical observations
  90. GRB 011121: Third HST Epoch
  91. GRB020305: Properties of the Candidate Optical Afterglow
  92. GRB 011121: HST Observations reveal an intermediate-time multicolor
  93. GRB011121, possible supernova association
  94. GRB011130 (XRF011130) Second Epoch Chandra Observations
  95. GRB020305: Subaru Optical Observations
  96. GRB 020305: Optical observations
  97. XRF/GRB 011030 Images
  98. XRF/GRB 011030: Detection of the Probable Host Galaxy
  99. GRB 020305: Candidate optical afterglow
  100. Type Ic SN2002bl (SN/GRB?) Radio Observations

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