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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"

36180 results found.

  1. GRB 020409
  2. GRB 020409 SARA Observations
  3. GRB "020411"
  4. GRB 020409, No Optical Detection to R = 20
  5. GRB020410: BeppoSAX NFI observation
  6. GRB 020409: Optical observations
  7. April 11 BeppoSAX event (GRB020411) is likely not a GRB
  8. GRB 020410, optical observations
  9. BeppoSAX ALERT: possible GRB020411
  10. GRB 020409, optical observations
  11. GRB 020409: Optical Observations
  12. GRB020406(?), optical observations
  13. GRB020410, optical observations
  14. BeppoSAX ALERT: possible GRB020410
  15. X-ray afterglow of GRB020321
  16. BeppoSAX GRB : GRB020409
  17. GRB020405: VLT optical observations and V band decay slope
  18. GRB020331 optical observations with RIMOTS
  19. GRB020124 optical observations with RIBOTS/RIMOTS
  20. GRB 020321: Candidate X-ray Counterparts
  21. ASM GRB candidate 020406 refined error box
  22. GRB 020405: Moderate-resolution spectroscopy
  23. GRB020406(?), optical observations
  24. GRB020405: VLT optical observations
  25. Revised Photometry of the Optical Afterglow of GRB 020405
  26. GRB020405: OT observations
  27. GRB 020331: Candidate Optical Afterglow
  28. GRB 020405: Decay index
  29. Short RXTE/ASM transient 020406; may be a GRB
  30. GRB020405, Radio Observations
  31. Fading Optical Afterglow and Possible Host Galaxy of GRB 020405
  32. GRB 020405, U-band observations
  33. GRB 020405: Optical afterglow candidate
  34. IPN localization of GRB020405
  35. GRB011212: Optical Observations
  36. GRB 020331: NIR Observations
  37. GRB 020331: NIR Observations
  38. GRB020331 NIR observation at KPNO (re-submission)
  39. GRB02033 NIR observation at KPNO
  40. GRB020331 field photometry
  41. GRB 020331 Optical Observations
  42. GRB 020331, NIR observations
  43. GRB 020331: Optical observations
  44. GRB020331(=H1963): The "Easter" Burst Detected by HETE
  45. GRB 020321: Infrared observations
  46. GRB 020322: BeppoSAX observations of the X-ray afterglow
  47. SN 2002ap - peak brightness date (SN/GRB?)
  48. GRB 020322, Radio observations
  49. Near-Infrared Observations of GRB020322 at TIRGO
  50. GRB 020321, Radio Observations
  51. GRB 020322: Optical Observations
  52. GRB020127: Proposed Host Galaxy Detection and Identification of Afterglow
  53. GRB 020321: Optical observations
  54. GRB020317 BVRI field photometry
  55. GRB011211 revised BVRI field photometry
  56. GRB020305 BVRI field photometry
  57. GRB020322 BVRI field photometry
  58. GRB 020322 optical observations
  59. GRB 020322 optical observation
  60. GRB020317 : Near IR Observations from Mt Abu Observatory
  61. GRB 020322: Optical Sources and Improved Astrometry
  62. GRB020322, optical observations
  63. GRB 020322: Optical candidate
  64. GRB020322: BeppoSAX/NFI Observations
  65. Bepposax GRB020322 The second springtime BSAX GRB
  66. GRB 020321: Optical observations
  67. GRB 011121: Fourth Epoch of HST Imaging
  68. GRB020317: optical observations
  69. GRB020321 optical observations
  70. GRB020321: BeppoSAX/NFI Observations
  71. GRB020321: a faint BeppoSAX detection
  72. GRB 020317 : KISO Optical Observations
  73. BeppoSAX ALERT: GRB020321, the "Springtime Burst"
  74. GRB020317 (=H1959): Localization by HETE of a Low Fluence GRB
  75. GRB 020305: Optical Observations
  76. GRB020317, optical observations
  77. GRB 020317: Optical observations
  78. GRB 011121: Third HST Epoch
  79. GRB020305: Properties of the Candidate Optical Afterglow
  80. GRB 011121: HST Observations reveal an intermediate-time multicolor
  81. GRB011121, possible supernova association
  82. GRB011130 (XRF011130) Second Epoch Chandra Observations
  83. GRB020305: Subaru Optical Observations
  84. GRB 020305: Optical observations
  85. XRF/GRB 011030 Images
  86. XRF/GRB 011030: Detection of the Probable Host Galaxy
  87. GRB 020305: Candidate optical afterglow
  88. Type Ic SN2002bl (SN/GRB?) Radio Observations
  89. GRB020305: Optical Observations
  90. IPN triangulation of GRB020305 (HETE 1939)
  91. GRB020305 (=H1939): Localization of a GRB by HETE
  92. GRB 020305: Optical observations
  93. HST Imaging of the afterglow and host of GRB 011121
  94. GRB 010921: HST Observations
  95. IPN detection and localization of Cygnus X-1 flares
  96. GRB020127: Further VLA Observations of Possible Counterparts
  97. IPN detection of further SGR1900+14 activity
  98. SGR1900+14 activity
  99. IPN/HETE Detection of Bursts from SGR1900+14
  100. IPN Upper Limits to a GRB Associated With SN2002ap

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