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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"

21793 results found.

  1. GRB020531(=H2042): Optical Observations
  2. GRB020531(=H2042): Optical Observations
  3. GRB020531: Optical observations
  4. GRB 020525: Optical Observations
  5. GRB020525, optical observations
  6. HETE Observations of GX354-0 (= MXB1728-34, so-called "Slow
  7. XRF020427: Chandra Identification of a Likely X-ray Counterpart
  8. GRB/XRF 020427, Radio Observations
  9. HST detection of the likely host galaxy of GRB 020124
  10. XRF020427: Chandra Observations and Candidate X-ray Counterparts
  11. GRB020321 : Optical observations.
  12. GRB020427 BeppoSAX NFI Observation
  13. XRF 020427
  14. GRB020331: Third Epoch and Revised Second Epoch Optical
  15. GRB 020410, Radio Observations
  16. GRB 020418: Optical observations
  17. GRB 020124: Optical observations
  18. GRB 020418: Optical observations
  19. GRB020405: VLT observations of the OT environment
  20. GRB020410: BeppoSAX NFI observations refined analysis
  21. GRB 020409: Optical Observations
  22. GRB 020409, 2-nd epoch optical observations at Terskol.
  23. GRB020405: predicted break
  24. GRB 020409: Optical observations
  25. GRB 020409, 2nd epoch optical observations
  26. GRB 020409
  27. GRB 020409 SARA Observations
  28. GRB "020411"
  29. GRB 020409: Optical observations
  30. GRB 020410, optical observations
  31. GRB 020409, optical observations
  32. GRB 020409: Optical Observations
  33. GRB020406(?), optical observations
  34. GRB020410, optical observations
  35. GRB020331: Confirmation of Afterglow Candidate with Magellan
  36. GRB020405: VLT optical observations and V band decay slope
  37. GRB020331 optical observations with RIMOTS
  38. GRB020124 optical observations with RIBOTS/RIMOTS
  39. GRB 020405: Moderate-resolution spectroscopy
  40. GRB020331: Optical Observations of Afterglow Candidate
  41. GRB020406(?), optical observations
  42. GRB020405: VLT optical observations
  43. GRB020405: OT observations
  44. GRB 020331: Candidate Optical Afterglow
  45. GRB 020405: Decay index
  46. Short RXTE/ASM transient 020406; may be a GRB
  47. GRB020405, Radio Observations
  48. GRB020405: VLT spectroscopy
  49. Fading Optical Afterglow and Possible Host Galaxy of GRB 020405
  50. V band observations of GRB020405
  51. GRB 020405, U-band observations
  52. GRB011212: Optical Observations
  53. GRB 020331: NIR Observations
  54. GRB 020331: NIR Observations
  55. GRB020331 NIR observation at KPNO (re-submission)
  56. GRB02033 NIR observation at KPNO
  57. GRB 020331 Optical Observations
  58. GRB 020331, NIR observations
  59. GRB 020331: Optical observations
  60. GRB 020321: Infrared observations
  61. GRB 020322: BeppoSAX observations of the X-ray afterglow
  62. GRB011211: HST Observations of Optical Afterglow and Host Galaxy
  63. GRB 020322, Radio observations
  64. Near-Infrared Observations of GRB020322 at TIRGO
  65. GRB 020321, Radio Observations
  66. GRB 020322: Optical Observations
  67. GRB020127: Proposed Host Galaxy Detection and Identification of Afterglow
  68. GRB 020321: Optical observations
  69. GRB 020322 optical observations
  70. GRB020317 : Near IR Observations from Mt Abu Observatory
  71. GRB020322, optical observations
  72. GRB020322: Optical Observations
  73. GRB020322: BeppoSAX/NFI Observations
  74. GRB 020321: Optical observations
  75. GRB 011121: Fourth Epoch of HST Imaging
  76. GRB020317: optical observations
  77. GRB020321 optical observations
  78. GRB020321: BeppoSAX/NFI Observations
  79. GRB020305: NIR observations
  80. GRB 020317 : KISO Optical Observations
  81. GRB 020305: Optical Observations
  82. GRB020317, optical observations
  83. GRB 020317: Optical observations
  84. GRB 011121: Third HST Epoch
  85. GRB 011121: HST Observations reveal an intermediate-time multicolor
  86. GRB011121, possible supernova association
  87. GRB011130 (XRF011130) Second Epoch Chandra Observations
  88. GRB020305: Subaru Optical Observations
  89. GRB 020305: Optical observations
  90. XRF/GRB 011030 Images
  91. XRF/GRB 011030: Detection of the Probable Host Galaxy
  92. GRB 020305: Candidate optical afterglow
  93. Type Ic SN2002bl (SN/GRB?) Radio Observations
  94. GRB020305, optical observations
  95. GRB020305: Optical Observations
  96. GRB 020305: Optical observations
  97. HST Imaging of the afterglow and host of GRB 011121
  98. GRB 010921: HST Observations
  99. GRB020127: Further VLA Observations of Possible Counterparts
  100. RXTE Observations of SGR 1900+14

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