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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"

41682 results found.

  1. GRB020531 Optical observations with TAROT
  2. GRB020531 Optical observations with TAROT
  3. GRB 020418, optical/near-IR observations
  4. GRB 020531, Radio Observations
  5. IPN triangulation of GRB020604
  6. GRB020531 Optical Observations
  7. GRB020531: Observations with the Chandra X-ray Observatory
  8. GRB 020603: Optical Observations
  9. GRB 020603, R-band observation
  10. Correction to IPN triangulation of GRB020603 (possible short/hard burst)
  11. GRB020531: Upper Limit for Detection of Two TAROT Sources
  12. GRB 020603: Optical observations
  13. IPN triangulation of GRB020603 (possible short/hard GRB)
  14. GRB 020531 optical observations with TAROT
  15. Refined IPN error box for GRB020531
  16. GRB020531, optical observations
  17. GRB020531: optical observations
  18. GRB020531, optical observation
  19. GRB020531(=H2042): Optical Observations
  20. IPN triangulation of the short, hard GRB020531 (=H2042)
  21. GRB020531(=H2042): Optical Observations
  22. GRB020531: Optical observations
  23. GRB020531(=H2042): A Short, Hard Burst Localized by HETE
  24. GRB 020525: Optical Observations
  25. GRB020525, optical observations
  26. IPN detection of possible bursts from SGR1806-20
  27. XRF 020427: Sudden Ionospheric Disturbance (SID)
  28. HETE Observations of GX354-0 (= MXB1728-34, so-called "Slow
  29. XRF020427: Chandra Identification of a Likely X-ray Counterpart
  30. IPN triangulation of a burst from SGR1806-20
  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. GRB020427 BeppoSAX NFI Observation
  38. XRF 020427
  39. GRB020331: Third Epoch and Revised Second Epoch Optical
  40. The end of BSAX GRB activities
  41. GRB 020410, Radio Observations
  42. GRB 020418: Optical observations
  43. GRB 020124: Optical observations
  44. GRB 020418: Optical observations
  45. GRB020405: VLT observations of the OT environment
  46. GRB020410: BeppoSAX NFI observations refined analysis
  47. GRB 020409: Optical Observations
  48. Mars Odyssey joins the IPN
  49. GRB 020409, 2-nd epoch optical observations at Terskol.
  50. GRB020405: predicted break
  51. GRB 020409: Optical observations
  52. GRB 020409, No Optical Detection to R = 22
  53. GRB020410: second BeppoSAX NFI observation
  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
  58. GRB 020409 SARA Observations
  59. GRB "020411"
  60. GRB 020409, No Optical Detection to R = 20
  61. GRB020410: BeppoSAX NFI observation
  62. GRB 020409: Optical observations
  63. GRB 020410, optical observations
  64. BeppoSAX ALERT: possible GRB020411
  65. GRB 020409, optical observations
  66. GRB 020409: Optical Observations
  67. GRB020406(?), optical observations
  68. BeppoSAX ALERT: possible GRB020410
  69. X-ray afterglow of GRB020321
  70. BeppoSAX GRB : GRB020409
  71. GRB020331: Confirmation of Afterglow Candidate with Magellan
  72. GRB020405: VLT optical observations and V band decay slope
  73. GRB020331 optical observations with RIMOTS
  74. GRB020124 optical observations with RIBOTS/RIMOTS
  75. GRB 020321: Candidate X-ray Counterparts
  76. ASM GRB candidate 020406 refined error box
  77. GRB 020405: Moderate-resolution spectroscopy
  78. GRB020331: Optical Observations of Afterglow Candidate
  79. GRB020406(?), optical observations
  80. GRB020405: VLT optical observations
  81. Revised Photometry of the Optical Afterglow of GRB 020405
  82. GRB020405: OT observations
  83. GRB 020331: Candidate Optical Afterglow
  84. GRB 020405: Decay index
  85. Short RXTE/ASM transient 020406; may be a GRB
  86. GRB020405, Radio Observations
  87. GRB020405: VLT spectroscopy
  88. Fading Optical Afterglow and Possible Host Galaxy of GRB 020405
  89. V band observations of GRB020405
  90. GRB 020405, U-band observations
  91. GRB 020405: Optical afterglow candidate
  92. IPN localization of GRB020405
  93. GRB011212: Optical Observations
  94. GRB 020331: NIR Observations
  95. GRB 020331: NIR Observations
  96. GRB020331 NIR observation at KPNO (re-submission)
  97. GRB02033 NIR observation at KPNO
  98. GRB020331 field photometry
  99. GRB 020331, NIR observations
  100. GRB 020331: Optical observations

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