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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"

35349 results found.

  1. IPN triangulation of GRB020706
  2. GRB 020705: Optical observations
  3. GRB 020625, optical observations
  4. GRB 020625: Optical observations
  5. GRB 020531: optical photometry of Chandra sources
  6. GRB020625 (=H2081): A Long Burst Localized by HETE
  7. The Probable Host Galaxy of GRB/XRF 020427
  8. GRB/XRF 020427, detection of an underlying system with the VLT
  9. GRB 020531, INT+WFC deep optical upper limits
  10. GRB020405: polarimetric observations
  11. GRB 020531, simultaneous optical observations
  12. GRB 020604, optical observations
  13. GRB 020531/Candidate Redshift
  14. GRB020531: Second epoch Chandra observations
  15. GRB020604, optical observations
  16. GRB020604, BVRcIc field photometry
  17. GRB020603, BVRcIc field observations
  18. GRB020531, BVRcIc field photometry
  19. GRB020531 Optical observations with TAROT
  20. GRB020531 Optical observations with TAROT
  21. GRB 020418, optical/near-IR observations
  22. GRB 020531, Radio Observations
  23. IPN triangulation of GRB020604
  24. GRB020531: Observations with the Chandra X-ray Observatory
  25. GRB 020603: Optical Observations
  26. GRB 020603, R-band observation
  27. Correction to IPN triangulation of GRB020603 (possible short/hard burst)
  28. GRB 020603: Optical observations
  29. IPN triangulation of GRB020603 (possible short/hard GRB)
  30. GRB 020531 optical observations with TAROT
  31. Refined IPN error box for GRB020531
  32. GRB020531, optical observations
  33. GRB020531(=H2042): Optical Observations
  34. IPN triangulation of the short, hard GRB020531 (=H2042)
  35. GRB020531(=H2042): Optical Observations
  36. GRB020531(=H2042): A Short, Hard Burst Localized by HETE
  37. GRB 020525: Optical Observations
  38. GRB020525, optical observations
  39. IPN detection of possible bursts from SGR1806-20
  40. IPN triangulation of GRB020525
  41. XRF020427: Chandra Identification of a Likely X-ray Counterpart
  42. IPN triangulation of a burst from SGR1806-20
  43. GRB/XRF 020427, Radio Observations
  44. HST detection of the likely host galaxy of GRB 020124
  45. XRF020427: Chandra Observations and Candidate X-ray Counterparts
  46. GRB(XRF) 020427: X-ray afterglow with BeppoSAX
  47. GRB020321 : Optical observations.
  48. GRB020427 BeppoSAX NFI Observation
  49. XRF 020427
  50. GRB020331: Third Epoch and Revised Second Epoch Optical
  51. The end of BSAX GRB activities
  52. GRB 020410, Radio Observations
  53. GRB 020418: Optical observations
  54. GRB 020124: Optical observations
  55. GRB 020418: Optical observations
  56. IPN triangulation of GRB020418
  57. GRB020405: VLT observations of the OT environment
  58. GRB020410: BeppoSAX NFI observations refined analysis
  59. GRB 020409: Optical Observations
  60. Mars Odyssey joins the IPN
  61. IPN triangulation of GRB020413
  62. GRB 020409, 2-nd epoch optical observations at Terskol.
  63. GRB 020409: Optical observations
  64. GRB 020409, No Optical Detection to R = 22
  65. GRB 020409: No Evidence for an Optical Afterglow
  66. GRB 020409, 2nd epoch optical observations
  67. GRB 020331 Kyoto observation on March 31
  68. GRB 020409
  69. GRB 020409 SARA Observations
  70. GRB "020411"
  71. GRB 020409, No Optical Detection to R = 20
  72. GRB020410: BeppoSAX NFI observation
  73. GRB 020409: Optical observations
  74. April 11 BeppoSAX event (GRB020411) is likely not a GRB
  75. GRB 020410, optical observations
  76. BeppoSAX ALERT: possible GRB020411
  77. GRB 020409, optical observations
  78. GRB 020409: Optical Observations
  79. GRB020406(?), optical observations
  80. GRB020410, optical observations
  81. BeppoSAX ALERT: possible GRB020410
  82. X-ray afterglow of GRB020321
  83. BeppoSAX GRB : GRB020409
  84. GRB020405: VLT optical observations and V band decay slope
  85. GRB020331 optical observations with RIMOTS
  86. GRB020124 optical observations with RIBOTS/RIMOTS
  87. GRB 020321: Candidate X-ray Counterparts
  88. ASM GRB candidate 020406 refined error box
  89. GRB 020405: Moderate-resolution spectroscopy
  90. GRB020406(?), optical observations
  91. GRB020405: VLT optical observations
  92. Revised Photometry of the Optical Afterglow of GRB 020405
  93. GRB020405: OT observations
  94. GRB 020331: Candidate Optical Afterglow
  95. GRB 020405: Decay index
  96. Short RXTE/ASM transient 020406; may be a GRB
  97. GRB020405, Radio Observations
  98. GRB020405: VLT spectroscopy
  99. Fading Optical Afterglow and Possible Host Galaxy of GRB 020405
  100. GRB 020405, U-band observations

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