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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"

21790 results found.

  1. GRB 020525: Optical Observations
  2. GRB020525, optical observations
  3. HETE Observations of GX354-0 (= MXB1728-34, so-called "Slow
  4. XRF020427: Chandra Identification of a Likely X-ray Counterpart
  5. GRB/XRF 020427, Radio Observations
  6. HST detection of the likely host galaxy of GRB 020124
  7. XRF020427: Chandra Observations and Candidate X-ray Counterparts
  8. GRB020321 : Optical observations.
  9. GRB020427 BeppoSAX NFI Observation
  10. XRF 020427
  11. GRB020331: Third Epoch and Revised Second Epoch Optical
  12. GRB 020410, Radio Observations
  13. GRB 020418: Optical observations
  14. GRB 020124: Optical observations
  15. GRB 020418: Optical observations
  16. GRB020405: VLT observations of the OT environment
  17. GRB020410: BeppoSAX NFI observations refined analysis
  18. GRB 020409: Optical Observations
  19. GRB 020409, 2-nd epoch optical observations at Terskol.
  20. GRB020405: predicted break
  21. GRB 020409: Optical observations
  22. GRB 020409, 2nd epoch optical observations
  23. GRB 020409
  24. GRB 020409 SARA Observations
  25. GRB "020411"
  26. GRB 020409: Optical observations
  27. GRB 020410, optical observations
  28. GRB 020409, optical observations
  29. GRB 020409: Optical Observations
  30. GRB020406(?), optical observations
  31. GRB020410, optical observations
  32. GRB020331: Confirmation of Afterglow Candidate with Magellan
  33. GRB020405: VLT optical observations and V band decay slope
  34. GRB020331 optical observations with RIMOTS
  35. GRB020124 optical observations with RIBOTS/RIMOTS
  36. GRB 020405: Moderate-resolution spectroscopy
  37. GRB020331: Optical Observations of Afterglow Candidate
  38. GRB020406(?), optical observations
  39. GRB020405: VLT optical observations
  40. GRB020405: OT observations
  41. GRB 020331: Candidate Optical Afterglow
  42. GRB 020405: Decay index
  43. Short RXTE/ASM transient 020406; may be a GRB
  44. GRB020405, Radio Observations
  45. GRB020405: VLT spectroscopy
  46. Fading Optical Afterglow and Possible Host Galaxy of GRB 020405
  47. V band observations of GRB020405
  48. GRB 020405, U-band observations
  49. GRB011212: Optical Observations
  50. GRB 020331: NIR Observations
  51. GRB 020331: NIR Observations
  52. GRB020331 NIR observation at KPNO (re-submission)
  53. GRB02033 NIR observation at KPNO
  54. GRB 020331 Optical Observations
  55. GRB 020331, NIR observations
  56. GRB 020331: Optical observations
  57. GRB 020321: Infrared observations
  58. GRB 020322: BeppoSAX observations of the X-ray afterglow
  59. GRB011211: HST Observations of Optical Afterglow and Host Galaxy
  60. GRB 020322, Radio observations
  61. Near-Infrared Observations of GRB020322 at TIRGO
  62. GRB 020321, Radio Observations
  63. GRB 020322: Optical Observations
  64. GRB020127: Proposed Host Galaxy Detection and Identification of Afterglow
  65. GRB 020321: Optical observations
  66. GRB 020322 optical observations
  67. GRB020317 : Near IR Observations from Mt Abu Observatory
  68. GRB020322, optical observations
  69. GRB020322: Optical Observations
  70. GRB020322: BeppoSAX/NFI Observations
  71. GRB 020321: Optical observations
  72. GRB 011121: Fourth Epoch of HST Imaging
  73. GRB020317: optical observations
  74. GRB020321 optical observations
  75. GRB020321: BeppoSAX/NFI Observations
  76. GRB020305: NIR observations
  77. GRB 020317 : KISO Optical Observations
  78. GRB 020305: Optical Observations
  79. GRB020317, optical observations
  80. GRB 020317: Optical observations
  81. GRB 011121: Third HST Epoch
  82. GRB 011121: HST Observations reveal an intermediate-time multicolor
  83. GRB011121, possible supernova association
  84. GRB011130 (XRF011130) Second Epoch Chandra Observations
  85. GRB020305: Subaru Optical Observations
  86. GRB 020305: Optical observations
  87. XRF/GRB 011030 Images
  88. XRF/GRB 011030: Detection of the Probable Host Galaxy
  89. GRB 020305: Candidate optical afterglow
  90. Type Ic SN2002bl (SN/GRB?) Radio Observations
  91. GRB020305, optical observations
  92. GRB020305: Optical Observations
  93. GRB 020305: Optical observations
  94. HST Imaging of the afterglow and host of GRB 011121
  95. GRB 010921: HST Observations
  96. GRB020127: Further VLA Observations of Possible Counterparts
  97. RXTE Observations of SGR 1900+14
  98. GRB020127: Palomar and VLA Observations of Possible Counterparts
  99. GRB020127: Comparison of Chandra Epochs and Identification of Possible Counterparts
  100. SN2002ap (SN/GRB?) Echelle spectra

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