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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"

45449 results found.

  1. GRB 020409, No Optical Detection to R = 22
  2. GRB020410: second BeppoSAX NFI observation
  3. GRB 020409: No Evidence for an Optical Afterglow
  4. GRB 020409, 2nd epoch optical observations
  5. GRB 020331 Kyoto observation on March 31
  6. GRB 020409
  7. GRB 020409 SARA Observations
  8. GRB "020411"
  9. GRB 020409, No Optical Detection to R = 20
  10. GRB020410: BeppoSAX NFI observation
  11. GRB 020409: Optical observations
  12. April 11 BeppoSAX event (GRB020411) is likely not a GRB
  13. GRB 020410, optical observations
  14. BeppoSAX ALERT: possible GRB020411
  15. GRB 020409, optical observations
  16. GRB 020409: Optical Observations
  17. GRB020406(?), optical observations
  18. GRB020410, optical observations
  19. BeppoSAX ALERT: possible GRB020410
  20. X-ray afterglow of GRB020321
  21. GRB020331: Confirmation of Afterglow Candidate with Magellan
  22. GRB020405: VLT optical observations and V band decay slope
  23. GRB020331 optical observations with RIMOTS
  24. GRB020124 optical observations with RIBOTS/RIMOTS
  25. GRB 020321: Candidate X-ray Counterparts
  26. ASM GRB candidate 020406 refined error box
  27. GRB 020405: Moderate-resolution spectroscopy
  28. GRB020331: Optical Observations of Afterglow Candidate
  29. GRB020406(?), optical observations
  30. GRB020405: VLT optical observations
  31. Revised Photometry of the Optical Afterglow of GRB 020405
  32. GRB020405: OT observations
  33. GRB 020331: Candidate Optical Afterglow
  34. GRB 020405: Decay index
  35. Short RXTE/ASM transient 020406; may be a GRB
  36. GRB020405, Radio Observations
  37. GRB020405: VLT spectroscopy
  38. Fading Optical Afterglow and Possible Host Galaxy of GRB 020405
  39. V band observations of GRB020405
  40. GRB 020405, U-band observations
  41. GRB 020405: Optical afterglow candidate
  42. IPN localization of GRB020405
  43. GRB011212: Optical Observations
  44. GRB 020331: NIR Observations
  45. GRB 020331: NIR Observations
  46. GRB020331 NIR observation at KPNO (re-submission)
  47. GRB02033 NIR observation at KPNO
  48. GRB020331 field photometry
  49. GRB 020331 Optical Observations
  50. GRB 020331, NIR observations
  51. GRB 020331: Optical observations
  52. GRB020331(=H1963): The "Easter" Burst Detected by HETE
  53. GRB 020321: Infrared observations
  54. GRB 020322: BeppoSAX observations of the X-ray afterglow
  55. SN 2002ap - peak brightness date (SN/GRB?)
  56. GRB011211: HST Observations of Optical Afterglow and Host Galaxy
  57. GRB 020322, Radio observations
  58. Near-Infrared Observations of GRB020322 at TIRGO
  59. GRB 020321, Radio Observations
  60. GRB 020322: Optical Observations
  61. GRB020127: Proposed Host Galaxy Detection and Identification of Afterglow
  62. GRB 020321: Optical observations
  63. GRB020317 BVRI field photometry
  64. GRB011211 revised BVRI field photometry
  65. GRB020305 BVRI field photometry
  66. GRB020322 BVRI field photometry
  67. GRB 020322 optical observations
  68. GRB020322: Candidate Optical Afterglow
  69. GRB 020322 optical observation
  70. GRB020317 : Near IR Observations from Mt Abu Observatory
  71. GRB 020322: Optical Sources and Improved Astrometry
  72. GRB020322, optical observations
  73. GRB 020322: Optical candidate
  74. XMM-Newton observation of GRB020322
  75. GRB020322: Optical Observations
  76. GRB020322: BeppoSAX/NFI Observations
  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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