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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"

20587 results found.

  1. GRB 070306: IR observations and candidate afterglow
  2. GRB 070306: Optical and IR observations with KANATA
  3. GRB070306 - SDSS Pre-burst Observations
  4. GRB 070306: Swift detection of a burst
  5. GRB 060605 new redshift
  6. GRB 070125, deep late-time optical observation
  7. VLA observation of GRB 070224
  8. GRB 070227: Swift/UVOT Upper Limits
  9. GRB 070227: TAROT La Silla observatory optical observations
  10. GRB 070227: Swift detection of a burst in ground analysis
  11. GRB 070224: Swift/UVOT Upper Limits
  12. VLA observation of GRB 070223
  13. VLA observation of GRB 070220
  14. GRB070224: Magellan Imaging Observations
  15. GRB 070224: WHT K-band imaging
  16. GRB 070224: MDM Observations
  17. GRB070224: Gemini Imaging Observations
  18. GRB 070224: SARA upper limit
  19. GRB 070224: optical afterglow candidate
  20. GRB 070224: MASTER-Net refind analysis
  21. GRB 070224: MASTER-VWF-Kislovodsk observations
  22. GRB 070224: Swift detection of a burst
  23. GRB 070223: Optical observations
  24. RHESSI Spectrum of GRB070220
  25. GRB070223: Swift/UVOT refined analysis
  26. GRB 070223: Optical-IR observation with KANATA
  27. GRB070223: MASTER-VWF-Kislovodsk observations
  28. GRB070223 - SDSS Pre-Burst Observations
  29. GRB070223: Swift burst
  30. Konus-Wind and Konus-A observations of GRB 070220
  31. GRB 070220: MITSuME Okayama Optical Observation
  32. GRB 070220 Swift-BAT Refined Analysis
  33. Swift/UVOT refined analysis of GRB070220
  34. GRB 070209: Swift XRT refined analysis
  35. GRB 070220: Observation with the KANATA 1.5m telescope
  36. GRB 070219: Gemini Observations
  37. GRB 070220: Swift detection of a burst
  38. GRB070219: MASTER-VWF-Kislovodsk observations
  39. GRB 070219: Swift/UVOT Upper limits
  40. GRB 070219: I-band observations
  41. GRB 070219: optical TNG observations
  42. GRB 070219: ROTSE-III Optical Limits
  43. GRB070219 - SDSS Pre-Burst Observations
  44. GRB 070219: Swift detection of a burst
  45. GRB 070125 observations with the GMRT
  46. GRB 070129: MDM I-band Detection
  47. GRB 070209: Swift XRT analysis
  48. GRB 070201: clarification on localization and Konus-Wind spectra
  49. IPN localization of very intense short GRB 070201
  50. GRB 070208: RAPTOR detection of early afterglow onset
  51. GRB 070208, Swift-BAT refined analysis
  52. GRB070208 - SDSS Pre-Burst Observations
  53. GRB 070208: Afterglow confirmation from P60
  54. GRB 070208: ROTSE-III Optical Limits
  55. GRB 070208: Swift detection of a burst
  56. GRB 070125 detection with CARMA
  57. GRB 070129: afterglow confirmation
  58. GRB070124: Swift-XRT Follow-up Observation
  59. GRB070126: Swift-XRT Observation
  60. GRB 070125: further AAVSO optical observations
  61. GRB 070129: Swift/UVOT Upper limits
  62. GRB 070129: Xinglong TNT optical Upper Limit
  63. GRB 070129: Swift-XRT Refined Analysis
  64. GRB 070129: VLT observations
  65. GRB 070125: An IR Point Source and an Apparent Host Galaxy
  66. GRB 070129: Swift detection of a burst
  67. GRB 070126: Swift/UVOT refined analysis
  68. Konus-Wind observation of GRB 070125
  69. GRB 070125: optical observations
  70. GRB 070126: VLT observations
  71. GRB 070124: Suzaku WAM observation of the prompt emissions
  72. GRB 070126, Swift-BAT refined analysis of a very faint burst
  73. GRB070125: Optical observation by Kanata
  74. GRB070124: Swift-XRT Observation
  75. Possible GRB 070126: Swift/UVOT Upper Limit
  76. GRB 070125: UVOT Observations of a Fading Optical Afterglow
  77. GRB 070125: Xinglong TNT optical observations
  78. GRB070125: Swift-XRT Refined Analysis
  79. GRB 070125: SARA detection in R
  80. GRB 070125: P60 Optical Afterglow Candidate
  81. GRB 070126?: Swift detection of a possible burst
  82. GRB070125 redshift request
  83. RHESSI Spectrum of GRB070125
  84. Konus-Wind observation of short hard GRB 070124
  85. IPN localization of GRB070124 (short duration, hard spectrum)
  86. GRB 070110: optical break
  87. GRB 070107: Suzaku WAM observation of the prompt emission
  88. GRB 070110, Swift-BAT refined analysis
  89. GRB070107 Swift/UVOT Observations of a Fading Optical Afterglow
  90. GRB 070110: Swift detection of a burst with a possible optical afterglow
  91. GRB 070107: Swift detection of a burst
  92. VLA observation of GRB 061222B
  93. VLA detection of GRB 061222A
  94. GRB070103: APO SPIcam i' and z' limits
  95. GRB070103: KPNO 4m+FLAMINGOS J limit
  96. GRB 070103: Swift/UVOT Upper limits
  97. GRB 070103: NOT observations
  98. GRB 070103: TAROT Calern observatory optical observations
  99. erratum : SDSS Pre-burst Observations of GRB061126
  100. Konus-Wind observation of GRB 061222A

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