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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"

32545 results found.

  1. GRB 020531, INT+WFC deep optical upper limits
  2. GRB020405: polarimetric observations
  3. GRB 020531, simultaneous optical observations
  4. GRB 020604, optical observations
  5. GRB 020531/Candidate Redshift
  6. GRB020531: Detection of Candidate Host Galaxy
  7. GRB020531: Second epoch Chandra observations
  8. GRB020604, optical observations
  9. GRB020604, BVRcIc field photometry
  10. GRB020603, BVRcIc field observations
  11. GRB020531, BVRcIc field photometry
  12. GRB020531 Optical observations with TAROT
  13. GRB020531 Optical observations with TAROT
  14. GRB 020531, Radio Observations
  15. GRB020531 Optical Observations
  16. GRB 020603: Optical Observations
  17. GRB 020603, R-band observation
  18. Correction to IPN triangulation of GRB020603 (possible short/hard burst)
  19. GRB020531: Upper Limit for Detection of Two TAROT Sources
  20. GRB 020603: Optical observations
  21. GRB 020531 optical observations with TAROT
  22. Refined IPN error box for GRB020531
  23. GRB020531, optical observations
  24. GRB020531: optical observations
  25. GRB020531(=H2042): Optical Observations
  26. IPN triangulation of the short, hard GRB020531 (=H2042)
  27. GRB020531(=H2042): Optical Observations
  28. GRB020531: Optical observations
  29. GRB020531(=H2042): A Short, Hard Burst Localized by HETE
  30. GRB 020525: Optical Observations
  31. GRB020525, optical observations
  32. IPN detection of possible bursts from SGR1806-20
  33. XRF 020427: Sudden Ionospheric Disturbance (SID)
  34. XRF020427: Chandra Identification of a Likely X-ray Counterpart
  35. GRB/XRF 020427, Radio Observations
  36. HST detection of the likely host galaxy of GRB 020124
  37. GRB020405 field photometry at ESO
  38. XRF020427: Chandra Observations and Candidate X-ray Counterparts
  39. GRB(XRF) 020427: X-ray afterglow with BeppoSAX
  40. GRB020321 : Optical observations.
  41. GRB020331: Third Epoch and Revised Second Epoch Optical
  42. GRB 020410, Radio Observations
  43. GRB 020418: Optical observations
  44. GRB 020124: Optical observations
  45. GRB 020418: Optical observations
  46. GRB020405: VLT observations of the OT environment
  47. GRB020410: BeppoSAX NFI observations refined analysis
  48. GRB 020409: Optical Observations
  49. Mars Odyssey joins the IPN
  50. GRB 020409, 2-nd epoch optical observations at Terskol.
  51. GRB020405: predicted break
  52. GRB 020409: Optical observations
  53. GRB 020409, No Optical Detection to R = 22
  54. GRB 020409: No Evidence for an Optical Afterglow
  55. GRB 020409, 2nd epoch optical observations
  56. GRB 020331 Kyoto observation on March 31
  57. GRB 020409, No Optical Detection to R = 20
  58. GRB 020409: Optical observations
  59. GRB 020410, optical observations
  60. GRB 020409, optical observations
  61. GRB 020409: Optical Observations
  62. GRB020406(?), optical observations
  63. X-ray afterglow of GRB020321
  64. GRB020331: Confirmation of Afterglow Candidate with Magellan
  65. GRB020405: VLT optical observations and V band decay slope
  66. GRB020331 optical observations with RIMOTS
  67. GRB020124 optical observations with RIBOTS/RIMOTS
  68. GRB 020321: Candidate X-ray Counterparts
  69. ASM GRB candidate 020406 refined error box
  70. GRB 020405: Moderate-resolution spectroscopy
  71. GRB020331: Optical Observations of Afterglow Candidate
  72. GRB020406(?), optical observations
  73. GRB020405: VLT optical observations
  74. Revised Photometry of the Optical Afterglow of GRB 020405
  75. GRB020405: OT observations
  76. GRB 020331: Candidate Optical Afterglow
  77. GRB 020405: Decay index
  78. GRB020405, Radio Observations
  79. GRB020405: VLT spectroscopy
  80. Fading Optical Afterglow and Possible Host Galaxy of GRB 020405
  81. V band observations of GRB020405
  82. GRB 020405, U-band observations
  83. IPN localization of GRB020405
  84. GRB011212: Optical Observations
  85. GRB 020331: NIR Observations
  86. GRB 020331: NIR Observations
  87. GRB020331 field photometry
  88. GRB 020331, NIR observations
  89. GRB 020331: Optical observations
  90. GRB020331(=H1963): The "Easter" Burst Detected by HETE
  91. GRB 020321: Infrared observations
  92. GRB 020322: BeppoSAX observations of the X-ray afterglow
  93. SN 2002ap - peak brightness date (SN/GRB?)
  94. GRB011211: HST Observations of Optical Afterglow and Host Galaxy
  95. GRB 020322, Radio observations
  96. Near-Infrared Observations of GRB020322 at TIRGO
  97. GRB 020321, Radio Observations
  98. GRB 020322: Optical Observations
  99. GRB020127: Proposed Host Galaxy Detection and Identification of Afterglow
  100. GRB 020321: Optical observations

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