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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"

20586 results found.

  1. GRB/XRF 020427, Radio Observations
  2. HST detection of the likely host galaxy of GRB 020124
  3. XRF020427: Chandra Observations and Candidate X-ray Counterparts
  4. GRB020321 : Optical observations.
  5. GRB020427 BeppoSAX NFI Observation
  6. XRF 020427
  7. GRB020331: Third Epoch and Revised Second Epoch Optical
  8. GRB 020410, Radio Observations
  9. GRB 020418: Optical observations
  10. GRB 020124: Optical observations
  11. GRB 020418: Optical observations
  12. GRB020405: VLT observations of the OT environment
  13. GRB020410: BeppoSAX NFI observations refined analysis
  14. GRB 020409: Optical Observations
  15. GRB 020409, 2-nd epoch optical observations at Terskol.
  16. GRB020405: predicted break
  17. GRB 020409: Optical observations
  18. GRB 020409, 2nd epoch optical observations
  19. GRB 020409
  20. GRB 020409 SARA Observations
  21. GRB "020411"
  22. GRB 020409: Optical observations
  23. GRB 020410, optical observations
  24. GRB 020409, optical observations
  25. GRB 020409: Optical Observations
  26. GRB020406(?), optical observations
  27. GRB020410, optical observations
  28. GRB020331: Confirmation of Afterglow Candidate with Magellan
  29. GRB020405: VLT optical observations and V band decay slope
  30. GRB020331 optical observations with RIMOTS
  31. GRB020124 optical observations with RIBOTS/RIMOTS
  32. GRB 020405: Moderate-resolution spectroscopy
  33. GRB020331: Optical Observations of Afterglow Candidate
  34. GRB020406(?), optical observations
  35. GRB020405: VLT optical observations
  36. GRB020405: OT observations
  37. GRB 020331: Candidate Optical Afterglow
  38. GRB 020405: Decay index
  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. GRB011212: Optical Observations
  46. GRB 020331: NIR Observations
  47. GRB 020331: NIR Observations
  48. GRB020331 NIR observation at KPNO (re-submission)
  49. GRB02033 NIR observation at KPNO
  50. GRB 020331 Optical Observations
  51. GRB 020331, NIR observations
  52. GRB 020331: Optical observations
  53. GRB 020321: Infrared observations
  54. GRB 020322: BeppoSAX observations of the X-ray afterglow
  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. GRB 020322 optical observations
  63. GRB020317 : Near IR Observations from Mt Abu Observatory
  64. GRB020322, optical observations
  65. GRB020322: Optical Observations
  66. GRB020322: BeppoSAX/NFI Observations
  67. GRB 020321: Optical observations
  68. GRB 011121: Fourth Epoch of HST Imaging
  69. GRB020317: optical observations
  70. GRB020321 optical observations
  71. GRB020321: BeppoSAX/NFI Observations
  72. GRB020305: NIR observations
  73. GRB 020317 : KISO Optical Observations
  74. GRB 020305: Optical Observations
  75. GRB020317, optical observations
  76. GRB 020317: Optical observations
  77. GRB 011121: Third HST Epoch
  78. GRB 011121: HST Observations reveal an intermediate-time multicolor
  79. GRB011121, possible supernova association
  80. GRB011130 (XRF011130) Second Epoch Chandra Observations
  81. GRB020305: Subaru Optical Observations
  82. GRB 020305: Optical observations
  83. XRF/GRB 011030 Images
  84. XRF/GRB 011030: Detection of the Probable Host Galaxy
  85. GRB 020305: Candidate optical afterglow
  86. Type Ic SN2002bl (SN/GRB?) Radio Observations
  87. GRB020305, optical observations
  88. GRB020305: Optical Observations
  89. GRB 020305: Optical observations
  90. HST Imaging of the afterglow and host of GRB 011121
  91. GRB 010921: HST Observations
  92. GRB020127: Further VLA Observations of Possible Counterparts
  93. RXTE Observations of SGR 1900+14
  94. GRB020127: Palomar and VLA Observations of Possible Counterparts
  95. GRB020127: Comparison of Chandra Epochs and Identification of Possible Counterparts
  96. SN2002ap (SN/GRB?) Echelle spectra
  97. SN2002ap (SN/GRB?) optical spectrographic observations
  98. GRB020127, WSRT radio observations
  99. GRB020127 Optical Observations
  100. SN 2002ap in M74

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