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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"

20961 results found.

  1. SGR-like X-ray Bursts from AXP 1E 2259+586: follow-up
  2. AXP 1E2259+586 optical observations
  3. Fading Optical Source in the Field of GRB020531
  4. GRB 020531, INT+WFC deep optical upper limits
  5. SGR-like Bursts from the AXP 1E 2259+586
  6. GRB020405: polarimetric observations
  7. GRB 020531, simultaneous optical observations
  8. GRB 020604, optical observations
  9. GRB 020531/Candidate Redshift
  10. GRB020531: Second epoch Chandra observations
  11. GRB020604, optical observations
  12. GRB020603, BVRcIc field observations
  13. GRB020531 Optical observations with TAROT
  14. GRB020531 Optical observations with TAROT
  15. GRB 020418, optical/near-IR observations
  16. GRB 020531, Radio Observations
  17. GRB020531 Optical Observations
  18. GRB020531: Observations with the Chandra X-ray Observatory
  19. GRB 020603: Optical Observations
  20. GRB020531: Upper Limit for Detection of Two TAROT Sources
  21. GRB 020603: Optical observations
  22. GRB 020531 optical observations with TAROT
  23. GRB020531, optical observations
  24. GRB020531: optical observations
  25. GRB020531(=H2042): Optical Observations
  26. GRB020531(=H2042): Optical Observations
  27. GRB020531: Optical observations
  28. GRB 020525: Optical Observations
  29. GRB020525, optical observations
  30. HETE Observations of GX354-0 (= MXB1728-34, so-called "Slow
  31. XRF020427: Chandra Identification of a Likely X-ray Counterpart
  32. GRB/XRF 020427, Radio Observations
  33. XRF020427: Chandra Observations and Candidate X-ray Counterparts
  34. GRB020321 : Optical observations.
  35. GRB020427 BeppoSAX NFI Observation
  36. XRF 020427
  37. GRB020331: Third Epoch and Revised Second Epoch Optical
  38. The end of BSAX GRB activities
  39. GRB 020410, Radio Observations
  40. GRB 020418: Optical observations
  41. GRB 020124: Optical observations
  42. GRB 020418: Optical observations
  43. GRB020405: VLT observations of the OT environment
  44. GRB020410: BeppoSAX NFI observations refined analysis
  45. GRB 020409: Optical Observations
  46. GRB 020409, 2-nd epoch optical observations at Terskol.
  47. GRB020405: predicted break
  48. GRB 020409: Optical observations
  49. GRB 020409, 2nd epoch optical observations
  50. GRB 020409
  51. GRB 020409 SARA Observations
  52. GRB "020411"
  53. GRB 020409: Optical observations
  54. GRB 020410, optical observations
  55. GRB 020409, optical observations
  56. GRB 020409: Optical Observations
  57. GRB020406(?), optical observations
  58. GRB020410, optical observations
  59. GRB020331: Confirmation of Afterglow Candidate with Magellan
  60. GRB020405: VLT optical observations and V band decay slope
  61. GRB020331 optical observations with RIMOTS
  62. GRB020124 optical observations with RIBOTS/RIMOTS
  63. GRB 020405: Moderate-resolution spectroscopy
  64. GRB020331: Optical Observations of Afterglow Candidate
  65. GRB020406(?), optical observations
  66. GRB020405: VLT optical observations
  67. Revised Photometry of the Optical Afterglow of GRB 020405
  68. GRB020405: OT observations
  69. GRB 020331: Candidate Optical Afterglow
  70. GRB 020405: Decay index
  71. Short RXTE/ASM transient 020406; may be a GRB
  72. GRB020405, Radio Observations
  73. V band observations of GRB020405
  74. GRB 020405, U-band observations
  75. GRB011212: Optical Observations
  76. GRB 020331: NIR Observations
  77. GRB 020331: NIR Observations
  78. GRB020331 NIR observation at KPNO (re-submission)
  79. GRB02033 NIR observation at KPNO
  80. GRB 020331 Optical Observations
  81. GRB 020331, NIR observations
  82. GRB 020331: Optical observations
  83. GRB 020321: Infrared observations
  84. GRB 020322: BeppoSAX observations of the X-ray afterglow
  85. GRB011211: HST Observations of Optical Afterglow and Host Galaxy
  86. GRB 020322, Radio observations
  87. Near-Infrared Observations of GRB020322 at TIRGO
  88. GRB 020321, Radio Observations
  89. GRB 020322: Optical Observations
  90. GRB 020321: Optical observations
  91. GRB 020322 optical observations
  92. GRB020317 : Near IR Observations from Mt Abu Observatory
  93. GRB020322, optical observations
  94. GRB020322: Optical Observations
  95. GRB020322: BeppoSAX/NFI Observations
  96. GRB 020321: Optical observations
  97. GRB 011121: Fourth Epoch of HST Imaging
  98. GRB020317: optical observations
  99. GRB020321 optical observations
  100. GRB020321: BeppoSAX/NFI Observations

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