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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"

27321 results found.

  1. VLA observation of GRB 070224
  2. GRB 070227: Swift/UVOT Upper Limits
  3. GRB 070227: TAROT La Silla observatory optical observations
  4. GRB 070227, Swift-BAT refined analysis
  5. GRB 070227: Swift detection of a burst in ground analysis
  6. GRB 070224: Swift/UVOT Upper Limits
  7. VLA observation of GRB 070223
  8. VLA observation of GRB 070220
  9. GRB070224: Magellan Imaging Observations
  10. GRB 070224: WHT K-band imaging
  11. GRB 070224: MDM Observations
  12. GRB070224: Gemini Imaging Observations
  13. GRB 070224: SARA upper limit
  14. GRB070224: Swift-XRT Refined Analysis
  15. GRB 070224: optical afterglow candidate
  16. GRB 070224, Swift-BAT refined analysis
  17. GRB 070224: MASTER-Net refind analysis
  18. GRB 070224: MASTER-VWF-Kislovodsk observations
  19. GRB 070224: Swift detection of a burst
  20. GRB 070223: Optical observations
  21. GRB070223: Swift/UVOT refined analysis
  22. GRB 070223: Optical-IR observation with KANATA
  23. GRB 070223, Swift-BAT refined analysis
  24. GRB070223: MASTER-VWF-Kislovodsk observations
  25. GRB 070223: Swift-XRT Refined Analysis
  26. GRB070223 - SDSS Pre-Burst Observations
  27. GRB 070223: MDM Observations
  28. GRB070223: Swift burst
  29. GRB 070220: MITSuME Okayama Optical Observation
  30. GRB 070220 Swift-BAT Refined Analysis
  31. Swift/UVOT refined analysis of GRB070220
  32. GRB 070209: Swift XRT refined analysis
  33. GRB 070220: Swift-XRT Refined Analysis
  34. GRB 070220: Observation with the KANATA 1.5m telescope
  35. GRB 070219: Gemini Observations
  36. GRB 070220: Swift detection of a burst
  37. GRB070219: MASTER-VWF-Kislovodsk observations
  38. GRB 070219: Swift/UVOT Upper limits
  39. GRB 070219: I-band observations
  40. GRB 070219, Swift-BAT refined analysis
  41. GRB 070219: optical TNG observations
  42. GRB070219 - SDSS Pre-Burst Observations
  43. GRB 070219: Swift detection of a burst
  44. GRB 070125 observations with the GMRT
  45. GRB 070209: Redshift of a galaxy in the error circle of XRT source
  46. GRB 070129: MDM I-band Detection
  47. GRB 070125: Break in Optical Decay
  48. GRB 070209: Swift XRT analysis
  49. GRB 070201: clarification on localization and Konus-Wind spectra
  50. IPN localization of very bright long hard GRB 070207
  51. GRB 070209, Swift-BAT refined analysis of the short hard burst
  52. GRB 070208: Swift XRT refined analysis
  53. GRB 070208, Swift-BAT refined analysis
  54. GRB070208 - SDSS Pre-Burst Observations
  55. GRB 070208: Early IR detection and afterglow astrometry
  56. GRB 070208: Swift detection of a burst
  57. GRB 070125 detection with CARMA
  58. GRB 070125: Redshift z>~1.54 from Gemini Afterglow Spectrum
  59. GRB 070129: afterglow confirmation
  60. GRB070126: Swift-XRT Observation
  61. GRB 070129: Swift/UVOT Upper limits
  62. GRB 070125: optical observation
  63. GRB 070129, Swift-BAT refined analysis of a particularly long
  64. GRB 070129: Xinglong TNT optical Upper Limit
  65. GRB 070129: Swift-XRT Refined Analysis
  66. GRB 070129: VLT observations
  67. GRB 070125: An IR Point Source and an Apparent Host Galaxy
  68. GRB 070129: Swift detection of a burst
  69. GRB 070126: Swift/UVOT refined analysis
  70. GRB 070125: MITSuME Okayama optical observation
  71. GRB 070125: optical observations
  72. GRB 070126: VLT observations
  73. GRB 070124: Suzaku WAM observation of the prompt emissions
  74. GRB 070125: UVOT Detection in Ultraviolet Filters
  75. GRB 070126, Swift-BAT refined analysis of a very faint burst
  76. GRB070125: Optical observation by Kanata
  77. GRB070124: Swift-XRT Observation
  78. Possible GRB 070126: Swift/UVOT Upper Limit
  79. GRB 070125: UVOT Observations of a Fading Optical Afterglow
  80. GRB 070125: Xinglong TNT optical observations
  81. GRB 070125: Keck/LRIS Spectroscopy -- Evidence for a very low redshift
  82. GRB 070125: Lick 3m Spectroscopy
  83. GRB070125: Swift-XRT Refined Analysis
  84. GRB 070125: SARA detection in R
  85. GRB 070125: P60 Optical Afterglow Candidate
  86. GRB 070126?: Swift detection of a possible burst
  87. GRB070125 redshift request
  88. IPN localization of GRB070124 (short duration, hard spectrum)
  89. GRB 070110: Ep,i - Eiso correlation
  90. GRB 070107: Suzaku WAM observation of the prompt emission
  91. GRB070110: Swift XRT Team refined analysis
  92. GRB 070110, Swift-BAT refined analysis
  93. GRB070107 Swift/UVOT Observations of a Fading Optical Afterglow
  94. GRB 070110: Swift detection of a burst with a possible optical afterglow
  95. GRB 070107: Possible UVOT Afterglow
  96. GRB 070107, Swift-BAT refined analysis
  97. GRB 070107: Swift detection of a burst
  98. VLA observation of GRB 061222B
  99. VLA detection of GRB 061222A
  100. GRB070103: APO SPIcam i' and z' limits

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