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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"

22062 results found.

  1. GRB020405: polarimetric observations
  2. GRB 020531, simultaneous optical observations
  3. GRB 020604, optical observations
  4. GRB 020531/Candidate Redshift
  5. GRB020531: Second epoch Chandra observations
  6. GRB020604, optical observations
  7. GRB020603, BVRcIc field observations
  8. GRB020531 Optical observations with TAROT
  9. GRB020531 Optical observations with TAROT
  10. GRB 020418, optical/near-IR observations
  11. GRB 020531, Radio Observations
  12. GRB020531 Optical Observations
  13. GRB020531: Observations with the Chandra X-ray Observatory
  14. GRB 020603: Optical Observations
  15. GRB020531: Upper Limit for Detection of Two TAROT Sources
  16. GRB 020603: Optical observations
  17. GRB 020531 optical observations with TAROT
  18. GRB020531, optical observations
  19. GRB020531: optical observations
  20. GRB020531(=H2042): Optical Observations
  21. GRB020531(=H2042): Optical Observations
  22. GRB020531: Optical observations
  23. GRB 020525: Optical Observations
  24. GRB020525, optical observations
  25. XRF 020427: Sudden Ionospheric Disturbance (SID)
  26. HETE Observations of GX354-0 (= MXB1728-34, so-called "Slow
  27. XRF020427: Chandra Identification of a Likely X-ray Counterpart
  28. GRB/XRF 020427, Radio Observations
  29. HST detection of the likely host galaxy of GRB 020124
  30. XRF020427: Chandra Observations and Candidate X-ray Counterparts
  31. GRB020321 : Optical observations.
  32. GRB020427 BeppoSAX NFI Observation
  33. XRF 020427
  34. GRB020331: Third Epoch and Revised Second Epoch Optical
  35. GRB 020410, Radio Observations
  36. GRB 020418: Optical observations
  37. GRB 020124: Optical observations
  38. GRB 020418: Optical observations
  39. GRB020405: VLT observations of the OT environment
  40. GRB020410: BeppoSAX NFI observations refined analysis
  41. GRB 020409: Optical Observations
  42. Mars Odyssey joins the IPN
  43. GRB 020409, 2-nd epoch optical observations at Terskol.
  44. GRB020405: predicted break
  45. GRB 020409: Optical observations
  46. GRB 020409, 2nd epoch optical observations
  47. GRB 020409
  48. GRB 020409 SARA Observations
  49. GRB "020411"
  50. GRB 020409: Optical observations
  51. GRB 020410, optical observations
  52. GRB 020409, optical observations
  53. GRB 020409: Optical Observations
  54. GRB020406(?), optical observations
  55. GRB020410, optical observations
  56. GRB020331: Confirmation of Afterglow Candidate with Magellan
  57. GRB020405: VLT optical observations and V band decay slope
  58. GRB020331 optical observations with RIMOTS
  59. GRB020124 optical observations with RIBOTS/RIMOTS
  60. GRB 020405: Moderate-resolution spectroscopy
  61. GRB020331: Optical Observations of Afterglow Candidate
  62. GRB020406(?), optical observations
  63. GRB020405: VLT optical observations
  64. GRB020405: OT observations
  65. GRB 020331: Candidate Optical Afterglow
  66. GRB 020405: Decay index
  67. Short RXTE/ASM transient 020406; may be a GRB
  68. GRB020405, Radio Observations
  69. V band observations of GRB020405
  70. GRB 020405, U-band observations
  71. GRB011212: Optical Observations
  72. GRB 020331: NIR Observations
  73. GRB 020331: NIR Observations
  74. GRB020331 NIR observation at KPNO (re-submission)
  75. GRB02033 NIR observation at KPNO
  76. GRB 020331 Optical Observations
  77. GRB 020331, NIR observations
  78. GRB 020331: Optical observations
  79. GRB 020321: Infrared observations
  80. GRB 020322: BeppoSAX observations of the X-ray afterglow
  81. GRB011211: HST Observations of Optical Afterglow and Host Galaxy
  82. GRB 020322, Radio observations
  83. Near-Infrared Observations of GRB020322 at TIRGO
  84. GRB 020321, Radio Observations
  85. GRB 020322: Optical Observations
  86. GRB 020321: Optical observations
  87. GRB020305 BVRI field photometry
  88. GRB 020322 optical observations
  89. GRB020317 : Near IR Observations from Mt Abu Observatory
  90. GRB020322, optical observations
  91. GRB020322: Optical Observations
  92. GRB020322: BeppoSAX/NFI Observations
  93. GRB 020321: Optical observations
  94. GRB020317: optical observations
  95. GRB020321 optical observations
  96. GRB020321: BeppoSAX/NFI Observations
  97. GRB020305: NIR observations
  98. GRB 020317 : KISO Optical Observations
  99. GRB 020305: Optical Observations
  100. GRB020317, optical observations

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