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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"

32538 results found.

  1. GRB020604, optical observations
  2. GRB020604, BVRcIc field photometry
  3. GRB020603, BVRcIc field observations
  4. GRB020531, BVRcIc field photometry
  5. GRB020531 Optical observations with TAROT
  6. GRB020531 Optical observations with TAROT
  7. GRB 020531, Radio Observations
  8. GRB020531 Optical Observations
  9. GRB 020603: Optical Observations
  10. GRB 020603, R-band observation
  11. Correction to IPN triangulation of GRB020603 (possible short/hard burst)
  12. GRB020531: Upper Limit for Detection of Two TAROT Sources
  13. GRB 020603: Optical observations
  14. GRB 020531 optical observations with TAROT
  15. Refined IPN error box for GRB020531
  16. GRB020531, optical observations
  17. GRB020531: optical observations
  18. GRB020531(=H2042): Optical Observations
  19. IPN triangulation of the short, hard GRB020531 (=H2042)
  20. GRB020531(=H2042): Optical Observations
  21. GRB020531: Optical observations
  22. GRB020531(=H2042): A Short, Hard Burst Localized by HETE
  23. GRB 020525: Optical Observations
  24. GRB020525, optical observations
  25. IPN detection of possible bursts from SGR1806-20
  26. XRF 020427: Sudden Ionospheric Disturbance (SID)
  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. GRB020405 field photometry at ESO
  31. XRF020427: Chandra Observations and Candidate X-ray Counterparts
  32. GRB(XRF) 020427: X-ray afterglow with BeppoSAX
  33. GRB020321 : Optical observations.
  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, No Optical Detection to R = 22
  47. GRB 020409: No Evidence for an Optical Afterglow
  48. GRB 020409, 2nd epoch optical observations
  49. GRB 020331 Kyoto observation on March 31
  50. GRB 020409, No Optical Detection to R = 20
  51. GRB 020409: Optical observations
  52. GRB 020410, optical observations
  53. GRB 020409, optical observations
  54. GRB 020409: Optical Observations
  55. GRB020406(?), optical observations
  56. X-ray afterglow of GRB020321
  57. GRB020331: Confirmation of Afterglow Candidate with Magellan
  58. GRB020405: VLT optical observations and V band decay slope
  59. GRB020331 optical observations with RIMOTS
  60. GRB020124 optical observations with RIBOTS/RIMOTS
  61. GRB 020321: Candidate X-ray Counterparts
  62. ASM GRB candidate 020406 refined error box
  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. GRB020405, Radio Observations
  72. GRB020405: VLT spectroscopy
  73. Fading Optical Afterglow and Possible Host Galaxy of GRB 020405
  74. V band observations of GRB020405
  75. GRB 020405, U-band observations
  76. IPN localization of GRB020405
  77. GRB011212: Optical Observations
  78. GRB 020331: NIR Observations
  79. GRB 020331: NIR Observations
  80. GRB020331 field photometry
  81. GRB 020331, NIR observations
  82. GRB 020331: Optical observations
  83. GRB020331(=H1963): The "Easter" Burst Detected by HETE
  84. GRB 020321: Infrared observations
  85. GRB 020322: BeppoSAX observations of the X-ray afterglow
  86. SN 2002ap - peak brightness date (SN/GRB?)
  87. GRB011211: HST Observations of Optical Afterglow and Host Galaxy
  88. GRB 020322, Radio observations
  89. Near-Infrared Observations of GRB020322 at TIRGO
  90. GRB 020321, Radio Observations
  91. GRB 020322: Optical Observations
  92. GRB020127: Proposed Host Galaxy Detection and Identification of Afterglow
  93. GRB 020321: Optical observations
  94. GRB020317 BVRI field photometry
  95. GRB011211 revised BVRI field photometry
  96. GRB020305 BVRI field photometry
  97. GRB020322 BVRI field photometry
  98. GRB 020322 optical observations
  99. GRB020322: Candidate Optical Afterglow
  100. GRB 020322 optical observation

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