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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"

32533 results found.

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

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