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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"

27397 results found.

  1. SGR1900+14 burst localized by HETE
  2. GRB020813: High-resolution optical spectroscopy
  3. GRB020812: negative optical observations
  4. GRB 020812: optical observation at Kyoto University
  5. Second epoch K band imaging of GRB 020819
  6. GRB 020813 : HST observations
  7. GRB 020812: early time optical observation at Ouda Station
  8. GRB020813: Magellan BVRI Photometry
  9. GRB 020819: Optical observations
  10. K band observation of GRB 020819
  11. GRB020813: optical and NIR observations
  12. GRB020813: Fading X-ray Afterglow Observed with Chandra
  13. GRB020813, UBVRI field calibration
  14. GRB020812: NIR observations
  15. Polarimetry of GRB020813: evidence for variability
  16. GRB020813 IRAM millimeter observations
  17. GRB020812: optical observations
  18. GRB020813: High-Resolution Optical Observations
  19. GRB 020812: optical observation at Bisei
  20. GRB020813: Early Time Magnitude
  21. Millimeter observation of GRB 020813
  22. GRB020812: optical observations
  23. GRB 020813 : KISO multiband optical observations
  24. GRB020813, optical observations
  25. IPN error box for GRB020813
  26. GRB020813, astrometric position
  27. Spectropolarimetry of GRB 020813
  28. GRB 020812 optical observation
  29. GRB020812(=H2257): A Long Burst Localized by HETE in Near-Real Time
  30. GRB020801: Imaging of Suggested OT Counterpart at the Magellan
  31. HST Imaging of the Host of GRB 011121
  32. GRB020801, optical afterglow candidate
  33. GRB020331: Late-time Optical Light Curve (re-submission)
  34. GRB020331: Late-time Optical Light Curve
  35. IPN triangulation of GRB020714
  36. IPN triangulation of GRB020715 (=GRB150702)
  37. IPN triangulation of GRB020714
  38. IPN triangulation of GRB150702
  39. GRB 020410: Discovery of Probable OT by HST
  40. GRB 020124, HST observations of the fading afterglow
  41. IPN triangulation of GRB020708
  42. IPN triangulation of GRB020708
  43. Correction to IPN error box for GRB020706
  44. IPN triangulation of GRB020706
  45. GRB 020705: Optical observations
  46. GRB 020625, optical observations
  47. GRB 020625: Optical observations
  48. GRB 020531: optical photometry of Chandra sources
  49. GRB020625 (=H2081): A Long Burst Localized by HETE
  50. The Probable Host Galaxy of GRB/XRF 020427
  51. GRB/XRF 020427, detection of an underlying system with the VLT
  52. Gemini IR Detection of AXP 1E 2259+586 Post-Burst
  53. AXP 1E2259+586 optical observations
  54. Fading Optical Source in the Field of GRB020531
  55. GRB 020531, INT+WFC deep optical upper limits
  56. SGR-like Bursts from the AXP 1E 2259+586
  57. GRB020405: polarimetric observations
  58. GRB 020531, simultaneous optical observations
  59. GRB 020531/Candidate Redshift
  60. GRB020531: Detection of Candidate Host Galaxy
  61. GRB020531: Second epoch Chandra observations
  62. GRB020604, optical observations
  63. GRB020604, BVRcIc field photometry
  64. GRB020603, BVRcIc field observations
  65. GRB020531, BVRcIc field photometry
  66. GRB020531 Optical Observations
  67. GRB020531: Observations with the Chandra X-ray Observatory
  68. GRB020531, optical observations
  69. GRB020531: optical observations
  70. GRB020531(=H2042): Optical Observations
  71. GRB020531(=H2042): Optical Observations
  72. GRB020531: Optical observations
  73. GRB020531(=H2042): A Short, Hard Burst Localized by HETE
  74. GRB020525, optical observations
  75. HETE Observations of GX354-0 (= MXB1728-34, so-called "Slow
  76. XRF020427: Chandra Identification of a Likely X-ray Counterpart
  77. HST detection of the likely host galaxy of GRB 020124
  78. GRB020405 field photometry at ESO
  79. XRF020427: Chandra Observations and Candidate X-ray Counterparts
  80. GRB(XRF) 020427: X-ray afterglow with BeppoSAX
  81. GRB020321 : Optical observations.
  82. XRF 020427
  83. GRB 020124: Optical observations
  84. IPN triangulation of GRB020418
  85. GRB020405: VLT observations of the OT environment
  86. IPN triangulation of GRB020413
  87. GRB020405: predicted break
  88. GRB 020409: No Evidence for an Optical Afterglow
  89. GRB 020331 Kyoto observation on March 31
  90. GRB020410: BeppoSAX NFI observation
  91. X-ray afterglow of GRB020321
  92. GRB020331 optical observations with RIMOTS
  93. GRB020124 optical observations with RIBOTS/RIMOTS
  94. GRB 020321: Candidate X-ray Counterparts
  95. GRB020406(?), optical observations
  96. GRB 020405: Decay index
  97. Short RXTE/ASM transient 020406; may be a GRB
  98. GRB020405, Radio Observations
  99. GRB 020405, U-band observations
  100. GRB011212: Optical Observations

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