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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"

35346 results found.

  1. IPN triangulation of GRB020708
  2. IPN triangulation of GRB020708
  3. IPN error box for GRB020706
  4. IPN triangulation of GRB020706
  5. GRB 020705: Optical observations
  6. GRB 020625, optical observations
  7. GRB 020625: Optical observations
  8. GRB 020531: optical photometry of Chandra sources
  9. GRB020625 (=H2081): A Long Burst Localized by HETE
  10. The Probable Host Galaxy of GRB/XRF 020427
  11. GRB/XRF 020427, detection of an underlying system with the VLT
  12. GRB 020531, INT+WFC deep optical upper limits
  13. GRB020405: polarimetric observations
  14. GRB 020531, simultaneous optical observations
  15. GRB 020604, optical observations
  16. GRB 020531/Candidate Redshift
  17. GRB020531: Second epoch Chandra observations
  18. GRB020604, optical observations
  19. GRB020604, BVRcIc field photometry
  20. GRB020603, BVRcIc field observations
  21. GRB020531, BVRcIc field photometry
  22. GRB020531 Optical observations with TAROT
  23. GRB020531 Optical observations with TAROT
  24. GRB 020418, optical/near-IR observations
  25. GRB 020531, Radio Observations
  26. IPN triangulation of GRB020604
  27. GRB020531: Observations with the Chandra X-ray Observatory
  28. GRB 020603: Optical Observations
  29. GRB 020603, R-band observation
  30. Correction to IPN triangulation of GRB020603 (possible short/hard burst)
  31. GRB 020603: Optical observations
  32. IPN triangulation of GRB020603 (possible short/hard GRB)
  33. GRB 020531 optical observations with TAROT
  34. Refined IPN error box for GRB020531
  35. GRB020531, optical observations
  36. GRB020531(=H2042): Optical Observations
  37. IPN triangulation of the short, hard GRB020531 (=H2042)
  38. GRB020531(=H2042): Optical Observations
  39. GRB020531(=H2042): A Short, Hard Burst Localized by HETE
  40. GRB 020525: Optical Observations
  41. GRB020525, optical observations
  42. IPN detection of possible bursts from SGR1806-20
  43. IPN triangulation of GRB020525
  44. XRF020427: Chandra Identification of a Likely X-ray Counterpart
  45. IPN triangulation of a burst from SGR1806-20
  46. GRB/XRF 020427, Radio Observations
  47. HST detection of the likely host galaxy of GRB 020124
  48. XRF020427: Chandra Observations and Candidate X-ray Counterparts
  49. GRB(XRF) 020427: X-ray afterglow with BeppoSAX
  50. GRB020321 : Optical observations.
  51. GRB020427 BeppoSAX NFI Observation
  52. XRF 020427
  53. GRB020331: Third Epoch and Revised Second Epoch Optical
  54. The end of BSAX GRB activities
  55. GRB 020410, Radio Observations
  56. GRB 020418: Optical observations
  57. GRB 020124: Optical observations
  58. GRB 020418: Optical observations
  59. IPN triangulation of GRB020418
  60. GRB020405: VLT observations of the OT environment
  61. GRB020410: BeppoSAX NFI observations refined analysis
  62. GRB 020409: Optical Observations
  63. Mars Odyssey joins the IPN
  64. IPN triangulation of GRB020413
  65. GRB 020409, 2-nd epoch optical observations at Terskol.
  66. GRB 020409: Optical observations
  67. GRB 020409, No Optical Detection to R = 22
  68. GRB 020409: No Evidence for an Optical Afterglow
  69. GRB 020409, 2nd epoch optical observations
  70. GRB 020331 Kyoto observation on March 31
  71. GRB 020409
  72. GRB 020409 SARA Observations
  73. GRB "020411"
  74. GRB 020409, No Optical Detection to R = 20
  75. GRB020410: BeppoSAX NFI observation
  76. GRB 020409: Optical observations
  77. April 11 BeppoSAX event (GRB020411) is likely not a GRB
  78. GRB 020410, optical observations
  79. BeppoSAX ALERT: possible GRB020411
  80. GRB 020409, optical observations
  81. GRB 020409: Optical Observations
  82. GRB020406(?), optical observations
  83. GRB020410, optical observations
  84. BeppoSAX ALERT: possible GRB020410
  85. X-ray afterglow of GRB020321
  86. BeppoSAX GRB : GRB020409
  87. GRB020405: VLT optical observations and V band decay slope
  88. GRB020331 optical observations with RIMOTS
  89. GRB020124 optical observations with RIBOTS/RIMOTS
  90. GRB 020321: Candidate X-ray Counterparts
  91. ASM GRB candidate 020406 refined error box
  92. GRB 020405: Moderate-resolution spectroscopy
  93. GRB020406(?), optical observations
  94. GRB020405: VLT optical observations
  95. Revised Photometry of the Optical Afterglow of GRB 020405
  96. GRB020405: OT observations
  97. GRB 020331: Candidate Optical Afterglow
  98. GRB 020405: Decay index
  99. Short RXTE/ASM transient 020406; may be a GRB
  100. GRB020405, Radio Observations

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