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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"

21786 results found.

  1. GRB 020812 optical observation
  2. GRB 020714, optical observations
  3. GRB020801: Imaging of Suggested OT Counterpart at the Magellan
  4. HST Imaging of the Host of GRB 011121
  5. GRB020801, optical afterglow candidate
  6. GRB020331: Late-time Optical Light Curve (re-submission)
  7. GRB020331: Late-time Optical Light Curve
  8. IPN triangulation of GRB020714
  9. IPN triangulation of GRB150702
  10. GRB 020410: Discovery of Probable OT by HST
  11. IPN triangulation of GRB020708
  12. IPN triangulation of GRB020708
  13. Correction to IPN error box for GRB020706
  14. IPN triangulation of GRB020706
  15. GRB 020705: Optical observations
  16. GRB 020625: Optical observations
  17. GRB 020531: optical photometry of Chandra sources
  18. The Probable Host Galaxy of GRB/XRF 020427
  19. GRB/XRF 020427, detection of an underlying system with the VLT
  20. Gemini IR Detection of AXP 1E 2259+586 Post-Burst
  21. AXP 1E2259+586 optical observations
  22. Fading Optical Source in the Field of GRB020531
  23. GRB 020531, INT+WFC deep optical upper limits
  24. GRB020405: polarimetric observations
  25. GRB 020531, simultaneous optical observations
  26. GRB020531: Second epoch Chandra observations
  27. GRB020604, optical observations
  28. GRB020604, BVRcIc field photometry
  29. GRB020603, BVRcIc field observations
  30. GRB020531, BVRcIc field photometry
  31. GRB 020531, Radio Observations
  32. IPN triangulation of GRB020604
  33. GRB020531 Optical Observations
  34. GRB020531: Observations with the Chandra X-ray Observatory
  35. GRB020531, optical observations
  36. GRB020531: optical observations
  37. GRB020531(=H2042): Optical Observations
  38. GRB020531(=H2042): Optical Observations
  39. GRB020525, optical observations
  40. IPN triangulation of GRB020525
  41. GRB020405 field photometry at ESO
  42. GRB(XRF) 020427: X-ray afterglow with BeppoSAX
  43. XRF 020427
  44. GRB 020124: Optical observations
  45. IPN triangulation of GRB020418
  46. GRB020405: VLT observations of the OT environment
  47. GRB020405: predicted break
  48. GRB 020409: No Evidence for an Optical Afterglow
  49. GRB 020331 Kyoto observation on March 31
  50. GRB 020409
  51. BeppoSAX ALERT: possible GRB020411
  52. X-ray afterglow of GRB020321
  53. GRB020331 optical observations with RIMOTS
  54. GRB020124 optical observations with RIBOTS/RIMOTS
  55. GRB 020321: Candidate X-ray Counterparts
  56. ASM GRB candidate 020406 refined error box
  57. GRB020406(?), optical observations
  58. Short RXTE/ASM transient 020406; may be a GRB
  59. GRB020405, Radio Observations
  60. GRB 020405, U-band observations
  61. IPN localization of GRB020405
  62. GRB020331 NIR observation at KPNO (re-submission)
  63. GRB02033 NIR observation at KPNO
  64. GRB020331 field photometry
  65. GRB 020331, NIR observations
  66. GRB 020322: BeppoSAX observations of the X-ray afterglow
  67. GRB011211: HST Observations of Optical Afterglow and Host Galaxy
  68. GRB 020322, Radio observations
  69. Near-Infrared Observations of GRB020322 at TIRGO
  70. GRB 020321, Radio Observations
  71. GRB 020322: Optical Observations
  72. GRB020127: Proposed Host Galaxy Detection and Identification of Afterglow
  73. GRB 020321: Optical observations
  74. GRB020317 BVRI field photometry
  75. GRB011211 revised BVRI field photometry
  76. GRB020305 BVRI field photometry
  77. GRB020322 BVRI field photometry
  78. GRB 020322: Optical Sources and Improved Astrometry
  79. GRB020317: optical observations
  80. GRB020321 optical observations
  81. GRB020321: a faint BeppoSAX detection
  82. GRB 020317 : KISO Optical Observations
  83. BeppoSAX ALERT: GRB020321, the "Springtime Burst"
  84. GRB 020305: Optical Observations
  85. GRB020317, optical observations
  86. GRB 020317: Optical observations
  87. GRB020305: Properties of the Candidate Optical Afterglow
  88. GRB 011121: HST Observations reveal an intermediate-time multicolor
  89. GRB011130 (XRF011130) Second Epoch Chandra Observations
  90. XRF/GRB 011030: Detection of the Probable Host Galaxy
  91. GRB020305, optical observations
  92. GRB020305 (=H1939): Localization of a GRB by HETE
  93. HST Imaging of the afterglow and host of GRB 011121
  94. SGR1900+14 activity
  95. IPN Upper Limits to a GRB Associated With SN2002ap
  96. GRB020124 BVRI field photometry
  97. SN2002ap (SN/GRB?) Echelle spectra
  98. SN2002ap (SN/GRB?) optical spectrographic observations
  99. GRB020127 Optical Observations
  100. SN 2002ap (SN/GRB?)

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