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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"

45651 results found.

  1. IPN error box for GRB020706
  2. Correction to IPN error box for GRB020706
  3. IPN triangulation of GRB020706
  4. GRB 020705: Optical observations
  5. GRB 020625, optical observations
  6. GRB 020625: Optical observations
  7. GRB 020531: optical photometry of Chandra sources
  8. GRB020625 (=H2081): A Long Burst Localized by HETE
  9. HETE #2081: Optical observations
  10. The Probable Host Galaxy of GRB/XRF 020427
  11. GRB/XRF 020427, detection of an underlying system with the VLT
  12. Gemini IR Detection of AXP 1E 2259+586 Post-Burst
  13. SGR-like X-ray Bursts from AXP 1E 2259+586: follow-up
  14. AXP 1E2259+586: quasi-simultaneous optical observation
  15. AXP 1E2259+586 optical observations
  16. Fading Optical Source in the Field of GRB020531
  17. GRB 020531, INT+WFC deep optical upper limits
  18. SGR-like Bursts from the AXP 1E 2259+586
  19. GRB020405: polarimetric observations
  20. GRB 020531, simultaneous optical observations
  21. GRB 020604, optical observations
  22. GRB 020531/Candidate Redshift
  23. GRB020531: Detection of Candidate Host Galaxy
  24. GRB020531: Second epoch Chandra observations
  25. GRB020604, optical observations
  26. GRB020604, BVRcIc field photometry
  27. GRB020603, BVRcIc field observations
  28. GRB020531, BVRcIc field photometry
  29. GRB020531 Optical observations with TAROT
  30. GRB020531 Optical observations with TAROT
  31. GRB 020418, optical/near-IR observations
  32. GRB 020531, Radio Observations
  33. IPN triangulation of GRB020604
  34. GRB020531 Optical Observations
  35. GRB020531: Observations with the Chandra X-ray Observatory
  36. GRB 020603: Optical Observations
  37. GRB 020603, R-band observation
  38. Correction to IPN triangulation of GRB020603 (possible short/hard burst)
  39. GRB020531: Upper Limit for Detection of Two TAROT Sources
  40. GRB 020603: Optical observations
  41. IPN triangulation of GRB020603 (possible short/hard GRB)
  42. GRB 020531 optical observations with TAROT
  43. Refined IPN error box for GRB020531
  44. GRB020531, optical observations
  45. GRB020531: optical observations
  46. GRB020531, optical observation
  47. GRB020531(=H2042): Optical Observations
  48. IPN triangulation of the short, hard GRB020531 (=H2042)
  49. GRB020531(=H2042): Optical Observations
  50. GRB020531: Optical observations
  51. GRB020531(=H2042): A Short, Hard Burst Localized by HETE
  52. GRB 020525: Optical Observations
  53. GRB020525, optical observations
  54. IPN detection of possible bursts from SGR1806-20
  55. IPN triangulation of GRB020525
  56. XRF 020427: Sudden Ionospheric Disturbance (SID)
  57. HETE Observations of GX354-0 (= MXB1728-34, so-called "Slow
  58. XRF020427: Chandra Identification of a Likely X-ray Counterpart
  59. IPN triangulation of a burst from SGR1806-20
  60. GRB/XRF 020427, Radio Observations
  61. HST detection of the likely host galaxy of GRB 020124
  62. GRB020405 field photometry at ESO
  63. XRF020427: Chandra Observations and Candidate X-ray Counterparts
  64. GRB(XRF) 020427: X-ray afterglow with BeppoSAX
  65. GRB020321 : Optical observations.
  66. GRB020427 BeppoSAX NFI Observation
  67. XRF 020427
  68. GRB020331: Third Epoch and Revised Second Epoch Optical
  69. The end of BSAX GRB activities
  70. GRB 020410, Radio Observations
  71. GRB 020418: Optical observations
  72. GRB 020124: Optical observations
  73. GRB 020418: Optical observations
  74. IPN triangulation of GRB020418
  75. GRB020405: VLT observations of the OT environment
  76. GRB020410: BeppoSAX NFI observations refined analysis
  77. GRB 020409: Optical Observations
  78. Mars Odyssey joins the IPN
  79. IPN triangulation of GRB020413
  80. GRB 020409, 2-nd epoch optical observations at Terskol.
  81. GRB020405: predicted break
  82. GRB 020409: Optical observations
  83. GRB 020409, No Optical Detection to R = 22
  84. GRB020410: second BeppoSAX NFI observation
  85. GRB 020409: No Evidence for an Optical Afterglow
  86. GRB 020409, 2nd epoch optical observations
  87. GRB 020331 Kyoto observation on March 31
  88. GRB 020409
  89. GRB 020409 SARA Observations
  90. GRB "020411"
  91. GRB 020409, No Optical Detection to R = 20
  92. GRB020410: BeppoSAX NFI observation
  93. GRB 020409: Optical observations
  94. April 11 BeppoSAX event (GRB020411) is likely not a GRB
  95. GRB 020410, optical observations
  96. BeppoSAX ALERT: possible GRB020411
  97. GRB 020409, optical observations
  98. GRB 020409: Optical Observations
  99. GRB020406(?), optical observations
  100. GRB020410, optical observations

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