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GCN Circulars

GCN Circulars are rapid bulletins submitted by and distributed to the community. 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"

20506 results found.

  1. GRB 070219, Swift-BAT refined analysis
  2. GRB 070219: optical TNG observations
  3. GRB070219 - SDSS Pre-Burst Observations
  4. GRB 070125 observations with the GMRT
  5. GRB 070129: MDM I-band Detection
  6. GRB 070125: Break in Optical Decay
  7. GRB 070209: Swift XRT analysis
  8. GRB 070201: clarification on localization and Konus-Wind spectra
  9. IPN localization of very bright long hard GRB 070207
  10. GRB 070208: MDM Optical Decay
  11. GRB070208 - SDSS Pre-Burst Observations
  12. GRB 070208: Swift detection of a burst
  13. GRB 070125 detection with CARMA
  14. GRB 070129: afterglow confirmation
  15. GRB070126: Swift-XRT Observation
  16. GRB 070125: further AAVSO optical observations
  17. GRB 070129: Swift/UVOT Upper limits
  18. GRB 070129: Xinglong TNT optical Upper Limit
  19. GRB 070129: Swift-XRT Refined Analysis
  20. GRB 070129: VLT observations
  21. GRB 070125: An IR Point Source and an Apparent Host Galaxy
  22. GRB 070129: Swift detection of a burst
  23. GRB 070126: Swift/UVOT refined analysis
  24. Konus-Wind observation of GRB 070125
  25. GRB 070125: optical observations
  26. GRB 070126: VLT observations
  27. GRB070126: Swift-XRT possible detection of an afterglow
  28. GRB070125: Optical observation by Kanata
  29. GRB070124: Swift-XRT Observation
  30. Possible GRB 070126: Swift/UVOT Upper Limit
  31. GRB 070125: UVOT Observations of a Fading Optical Afterglow
  32. GRB 070125: Xinglong TNT optical observations
  33. GRB070125: Swift-XRT Refined Analysis
  34. GRB 070125: SARA detection in R
  35. GRB 070125: P60 Optical Afterglow Candidate
  36. GRB 070126?: Swift detection of a possible burst
  37. GRB070125 redshift request
  38. RHESSI Spectrum of GRB070125
  39. IPN-BAT localization of GRB070125 (very long duration, intense)
  40. GRB 070110: Continued Detection and Request for Ground Followup
  41. GRB070107 Swift/UVOT Observations of a Fading Optical Afterglow
  42. GRB 070110: Swift detection of a burst with a possible optical afterglow
  43. GRB 070107: Possible UVOT Afterglow
  44. GRB 070107: Swift detection of a burst
  45. VLA observation of GRB 061222B
  46. VLA detection of GRB 061222A
  47. GRB070103: APO SPIcam i' and z' limits
  48. GRB070103: KPNO 4m+FLAMINGOS J limit
  49. GRB 070103: Swift/UVOT Upper limits
  50. GRB 070103: NOT observations
  51. GRB 070103: TAROT Calern observatory optical observations
  52. erratum : SDSS Pre-burst Observations of GRB061126
  53. GRB 061210: Swift/XRT Astrometry Correction
  54. GRB 061222A: Confirmation of Gemini Afterglow Candidate
  55. GRB 061222A: Xinglong Optical Limit
  56. GRB 061222A: Gemini Afterglow Candidate
  57. GRB061222A Swift/UVOT: Upper Limits
  58. GRB 061222B: Swift/UVOT Upper limits
  59. GRB 061222B: Observation with the KANATA 1.5m telescope
  60. GRB 061222A: Observation with the KANATA 1.5m telescope
  61. GRB 061222B: BOOTES-IR optical observations
  62. GRB 061222B: SARA upper limit
  63. GRB 061222B: REM NIR/optical observations
  64. GRB 061222B: TAROT La Silla observatory optical observations
  65. GRB 061222B: Swift detection of a burst
  66. GRB 061222A: Prompt ROTSE-III Optical Limits
  67. GRB 061222: Swift detection of a burst
  68. GRB 061218: TAROT La Silla observatory optical observations
  69. GRB 061217: TAROT Calern observatory optical observations
  70. GRB 061218: TORTOREM optical upper limits
  71. GRB 061218, Swift-BAT refined analysis
  72. GRB061217: VLT NIR observations
  73. GRB 061218, SMARTS optical/IR observations
  74. GRB 061218: REM prompt observations
  75. Swift triggers (#251863) on a possible burst
  76. GRB061217: Swift/UVOT refined analysis.
  77. GRB 061217: optical observations at Calar Alto
  78. GRB061217 - Swift/XRT refined analysis
  79. GRB 061217: Magellan Observations
  80. GRB 061217: REM prompt observations
  81. GRB 061217: ROTSE-III Optical Limits
  82. GRB061210: Swift/UVOT observations
  83. GRB 061210: Swift XRT analysis - Possible counterparts
  84. GRB 061214(?): Swift detection of a possible burst
  85. GRB 061210: Gemini/GMOS Observations
  86. GRB 061126: Radio Observations
  87. GRB061210: Radio Observations
  88. GRB 061210: Swift-BAT detection of a short burst
  89. Optical Afterglow observations of GRB 061126
  90. GRB 061201: UVOT Observations of a Fading Optical Afterglow
  91. GRB 061202: TORTOREM optical upper limits
  92. GRB 061201: VLT optical decay
  93. GRB 061201: SOAR Confirmation of Candidate Afterglow
  94. GRB061202: FRAM early follow-up limit
  95. GRB061202 optical limit by "Pi of the Sky"
  96. GRB061202: optical/NIR observations with REM
  97. GRB061202: Swift/UVOT Upper Limits
  98. GRB 061202: Swift detection of a burst
  99. GRB 061201: Swift XRT Team refined analysis
  100. GRB 061201: VLT optical observations

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