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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"

45450 results found.

  1. GRB 020409: Optical observations
  2. GRB 020409, No Optical Detection to R = 22
  3. GRB020410: second BeppoSAX NFI observation
  4. GRB 020409: No Evidence for an Optical Afterglow
  5. GRB 020409, 2nd epoch optical observations
  6. GRB 020331 Kyoto observation on March 31
  7. GRB 020409
  8. GRB 020409 SARA Observations
  9. GRB "020411"
  10. GRB 020409, No Optical Detection to R = 20
  11. GRB020410: BeppoSAX NFI observation
  12. GRB 020409: Optical observations
  13. April 11 BeppoSAX event (GRB020411) is likely not a GRB
  14. GRB 020410, optical observations
  15. BeppoSAX ALERT: possible GRB020411
  16. GRB 020409, optical observations
  17. GRB 020409: Optical Observations
  18. GRB020406(?), optical observations
  19. GRB020410, optical observations
  20. BeppoSAX ALERT: possible GRB020410
  21. X-ray afterglow of GRB020321
  22. GRB020331: Confirmation of Afterglow Candidate with Magellan
  23. GRB020405: VLT optical observations and V band decay slope
  24. GRB020331 optical observations with RIMOTS
  25. GRB020124 optical observations with RIBOTS/RIMOTS
  26. GRB 020321: Candidate X-ray Counterparts
  27. ASM GRB candidate 020406 refined error box
  28. GRB 020405: Moderate-resolution spectroscopy
  29. GRB020331: Optical Observations of Afterglow Candidate
  30. GRB020406(?), optical observations
  31. GRB020405: VLT optical observations
  32. Revised Photometry of the Optical Afterglow of GRB 020405
  33. GRB020405: OT observations
  34. GRB 020331: Candidate Optical Afterglow
  35. GRB 020405: Decay index
  36. Short RXTE/ASM transient 020406; may be a GRB
  37. GRB020405, Radio Observations
  38. GRB020405: VLT spectroscopy
  39. Fading Optical Afterglow and Possible Host Galaxy of GRB 020405
  40. V band observations of GRB020405
  41. GRB 020405, U-band observations
  42. GRB 020405: Optical afterglow candidate
  43. IPN localization of GRB020405
  44. GRB011212: Optical Observations
  45. GRB 020331: NIR Observations
  46. GRB 020331: NIR Observations
  47. GRB020331 NIR observation at KPNO (re-submission)
  48. GRB02033 NIR observation at KPNO
  49. GRB020331 field photometry
  50. GRB 020331 Optical Observations
  51. GRB 020331, NIR observations
  52. GRB 020331: Optical observations
  53. GRB020331(=H1963): The "Easter" Burst Detected by HETE
  54. GRB 020321: Infrared observations
  55. GRB 020322: BeppoSAX observations of the X-ray afterglow
  56. SN 2002ap - peak brightness date (SN/GRB?)
  57. GRB011211: HST Observations of Optical Afterglow and Host Galaxy
  58. GRB 020322, Radio observations
  59. Near-Infrared Observations of GRB020322 at TIRGO
  60. GRB 020321, Radio Observations
  61. GRB 020322: Optical Observations
  62. GRB020127: Proposed Host Galaxy Detection and Identification of Afterglow
  63. GRB 020321: Optical observations
  64. GRB020317 BVRI field photometry
  65. GRB011211 revised BVRI field photometry
  66. GRB020305 BVRI field photometry
  67. GRB020322 BVRI field photometry
  68. GRB 020322 optical observations
  69. GRB020322: Candidate Optical Afterglow
  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. GRB 020321: Optical observations
  79. GRB 011121: Fourth Epoch of HST Imaging
  80. GRB020317: optical observations
  81. GRB020321 optical observations
  82. GRB020321: BeppoSAX/NFI Observations
  83. GRB020321: a faint BeppoSAX detection
  84. GRB020305: NIR observations
  85. GRB 020317 : KISO Optical Observations
  86. BeppoSAX ALERT: GRB020321, the "Springtime Burst"
  87. GRB020317 (=H1959): Localization by HETE of a Low Fluence GRB
  88. GRB 020305: Optical Observations
  89. GRB020317, optical observations
  90. GRB 020317: Optical observations
  91. GRB 011121: Third HST Epoch
  92. GRB020305: Properties of the Candidate Optical Afterglow
  93. GRB 011121: HST Observations reveal an intermediate-time multicolor
  94. GRB011121, possible supernova association
  95. GRB011130 (XRF011130) Second Epoch Chandra Observations
  96. GRB020305: Subaru Optical Observations
  97. GRB 020305: 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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