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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"

21772 results found.

  1. GRB 020705: Optical observations
  2. GRB 020625: Optical observations
  3. GRB 020531: optical photometry of Chandra sources
  4. The Probable Host Galaxy of GRB/XRF 020427
  5. GRB/XRF 020427, detection of an underlying system with the VLT
  6. Gemini IR Detection of AXP 1E 2259+586 Post-Burst
  7. AXP 1E2259+586 optical observations
  8. Fading Optical Source in the Field of GRB020531
  9. GRB 020531, INT+WFC deep optical upper limits
  10. GRB020405: polarimetric observations
  11. GRB 020531, simultaneous optical observations
  12. GRB020531: Second epoch Chandra observations
  13. GRB020604, optical observations
  14. GRB020604, BVRcIc field photometry
  15. GRB020603, BVRcIc field observations
  16. GRB020531, BVRcIc field photometry
  17. GRB 020531, Radio Observations
  18. IPN triangulation of GRB020604
  19. GRB020531 Optical Observations
  20. GRB020531: Observations with the Chandra X-ray Observatory
  21. GRB020531, optical observations
  22. GRB020531: optical observations
  23. GRB020531(=H2042): Optical Observations
  24. GRB020531(=H2042): Optical Observations
  25. GRB020525, optical observations
  26. IPN triangulation of GRB020525
  27. GRB020405 field photometry at ESO
  28. GRB(XRF) 020427: X-ray afterglow with BeppoSAX
  29. XRF 020427
  30. GRB 020124: Optical observations
  31. IPN triangulation of GRB020418
  32. GRB020405: VLT observations of the OT environment
  33. GRB020405: predicted break
  34. GRB 020409: No Evidence for an Optical Afterglow
  35. GRB 020331 Kyoto observation on March 31
  36. GRB 020409
  37. BeppoSAX ALERT: possible GRB020411
  38. X-ray afterglow of GRB020321
  39. GRB020331 optical observations with RIMOTS
  40. GRB020124 optical observations with RIBOTS/RIMOTS
  41. GRB 020321: Candidate X-ray Counterparts
  42. ASM GRB candidate 020406 refined error box
  43. GRB020406(?), optical observations
  44. Short RXTE/ASM transient 020406; may be a GRB
  45. GRB020405, Radio Observations
  46. GRB 020405, U-band observations
  47. IPN localization of GRB020405
  48. GRB020331 NIR observation at KPNO (re-submission)
  49. GRB02033 NIR observation at KPNO
  50. GRB020331 field photometry
  51. GRB 020331, NIR observations
  52. GRB 020322: BeppoSAX observations of the X-ray afterglow
  53. GRB011211: HST Observations of Optical Afterglow and Host Galaxy
  54. GRB 020322, Radio observations
  55. Near-Infrared Observations of GRB020322 at TIRGO
  56. GRB 020321, Radio Observations
  57. GRB 020322: Optical Observations
  58. GRB020127: Proposed Host Galaxy Detection and Identification of Afterglow
  59. GRB 020321: Optical observations
  60. GRB020317 BVRI field photometry
  61. GRB011211 revised BVRI field photometry
  62. GRB020305 BVRI field photometry
  63. GRB020322 BVRI field photometry
  64. GRB 020322: Optical Sources and Improved Astrometry
  65. GRB020317: optical observations
  66. GRB020321 optical observations
  67. GRB020321: a faint BeppoSAX detection
  68. GRB 020317 : KISO Optical Observations
  69. BeppoSAX ALERT: GRB020321, the "Springtime Burst"
  70. GRB 020305: Optical Observations
  71. GRB020317, optical observations
  72. GRB 020317: Optical observations
  73. GRB020305: Properties of the Candidate Optical Afterglow
  74. GRB 011121: HST Observations reveal an intermediate-time multicolor
  75. GRB011130 (XRF011130) Second Epoch Chandra Observations
  76. XRF/GRB 011030: Detection of the Probable Host Galaxy
  77. GRB020305, optical observations
  78. GRB020305 (=H1939): Localization of a GRB by HETE
  79. HST Imaging of the afterglow and host of GRB 011121
  80. SGR1900+14 activity
  81. IPN Upper Limits to a GRB Associated With SN2002ap
  82. GRB020124 BVRI field photometry
  83. SN2002ap (SN/GRB?) Echelle spectra
  84. SN2002ap (SN/GRB?) optical spectrographic observations
  85. GRB020127 Optical Observations
  86. SN 2002ap (SN/GRB?)
  87. SN2002ap (SN/GRB?) UBVRI Field Photometry
  88. GRB020127: Chandra Observations and Prospective Counterparts
  89. pre-SN2002ap (SN/GRB?) imaging of M74
  90. GRB020124, optical observations
  91. GRB 020127, I-band observations starting 3.14-hr after the event
  92. GRB010921 Optical Observations
  93. GRB020124: Optical observations
  94. GRB 020124: Optical observations
  95. Possible optical counterpart to a GRB
  96. GRB011212, Optical Observations
  97. Optical polarization observations for GRB011211
  98. GRB 011211: Detection of the Probable Host Galaxy
  99. GRB 011130 and GRB 011212 - Milagro GeV/TeV Observations
  100. GRB 011130: Optical Observations of X-ray and Radio Sources

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