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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"

32541 results found.

  1. GRB 020531/Candidate Redshift
  2. GRB020531: Detection of Candidate Host Galaxy
  3. GRB020531: Second epoch Chandra observations
  4. GRB020604, optical observations
  5. GRB020604, BVRcIc field photometry
  6. GRB020603, BVRcIc field observations
  7. GRB020531, BVRcIc field photometry
  8. GRB020531 Optical observations with TAROT
  9. GRB020531 Optical observations with TAROT
  10. GRB 020531, Radio Observations
  11. GRB020531 Optical Observations
  12. GRB 020603: Optical Observations
  13. GRB 020603, R-band observation
  14. Correction to IPN triangulation of GRB020603 (possible short/hard burst)
  15. GRB020531: Upper Limit for Detection of Two TAROT Sources
  16. GRB 020603: Optical observations
  17. GRB 020531 optical observations with TAROT
  18. Refined IPN error box for GRB020531
  19. GRB020531, optical observations
  20. GRB020531: optical observations
  21. GRB020531(=H2042): Optical Observations
  22. IPN triangulation of the short, hard GRB020531 (=H2042)
  23. GRB020531(=H2042): Optical Observations
  24. GRB020531: Optical observations
  25. GRB020531(=H2042): A Short, Hard Burst Localized by HETE
  26. GRB 020525: Optical Observations
  27. GRB020525, optical observations
  28. IPN detection of possible bursts from SGR1806-20
  29. XRF 020427: Sudden Ionospheric Disturbance (SID)
  30. XRF020427: Chandra Identification of a Likely X-ray Counterpart
  31. GRB/XRF 020427, Radio Observations
  32. HST detection of the likely host galaxy of GRB 020124
  33. GRB020405 field photometry at ESO
  34. XRF020427: Chandra Observations and Candidate X-ray Counterparts
  35. GRB(XRF) 020427: X-ray afterglow with BeppoSAX
  36. GRB020321 : Optical observations.
  37. GRB020331: Third Epoch and Revised Second Epoch Optical
  38. GRB 020410, Radio Observations
  39. GRB 020418: Optical observations
  40. GRB 020124: Optical observations
  41. GRB 020418: Optical observations
  42. GRB020405: VLT observations of the OT environment
  43. GRB020410: BeppoSAX NFI observations refined analysis
  44. GRB 020409: Optical Observations
  45. Mars Odyssey joins the IPN
  46. GRB 020409, 2-nd epoch optical observations at Terskol.
  47. GRB020405: predicted break
  48. GRB 020409: Optical observations
  49. GRB 020409, No Optical Detection to R = 22
  50. GRB 020409: No Evidence for an Optical Afterglow
  51. GRB 020409, 2nd epoch optical observations
  52. GRB 020331 Kyoto observation on March 31
  53. GRB 020409, No Optical Detection to R = 20
  54. GRB 020409: Optical observations
  55. GRB 020410, optical observations
  56. GRB 020409, optical observations
  57. GRB 020409: Optical Observations
  58. GRB020406(?), optical observations
  59. X-ray afterglow of GRB020321
  60. GRB020331: Confirmation of Afterglow Candidate with Magellan
  61. GRB020405: VLT optical observations and V band decay slope
  62. GRB020331 optical observations with RIMOTS
  63. GRB020124 optical observations with RIBOTS/RIMOTS
  64. GRB 020321: Candidate X-ray Counterparts
  65. ASM GRB candidate 020406 refined error box
  66. GRB 020405: Moderate-resolution spectroscopy
  67. GRB020331: Optical Observations of Afterglow Candidate
  68. GRB020406(?), optical observations
  69. GRB020405: VLT optical observations
  70. Revised Photometry of the Optical Afterglow of GRB 020405
  71. GRB020405: OT observations
  72. GRB 020331: Candidate Optical Afterglow
  73. GRB 020405: Decay index
  74. GRB020405, Radio Observations
  75. GRB020405: VLT spectroscopy
  76. Fading Optical Afterglow and Possible Host Galaxy of GRB 020405
  77. V band observations of GRB020405
  78. GRB 020405, U-band observations
  79. IPN localization of GRB020405
  80. GRB011212: Optical Observations
  81. GRB 020331: NIR Observations
  82. GRB 020331: NIR Observations
  83. GRB020331 field photometry
  84. GRB 020331, NIR observations
  85. GRB 020331: Optical observations
  86. GRB020331(=H1963): The "Easter" Burst Detected by HETE
  87. GRB 020321: Infrared observations
  88. GRB 020322: BeppoSAX observations of the X-ray afterglow
  89. SN 2002ap - peak brightness date (SN/GRB?)
  90. GRB011211: HST Observations of Optical Afterglow and Host Galaxy
  91. GRB 020322, Radio observations
  92. Near-Infrared Observations of GRB020322 at TIRGO
  93. GRB 020321, Radio Observations
  94. GRB 020322: Optical Observations
  95. GRB020127: Proposed Host Galaxy Detection and Identification of Afterglow
  96. GRB 020321: Optical observations
  97. GRB020317 BVRI field photometry
  98. GRB011211 revised BVRI field photometry
  99. GRB020305 BVRI field photometry
  100. GRB020322 BVRI field photometry

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