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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"

36206 results found.

  1. GRB 070208: Afterglow confirmation from P60
  2. GRB070208: Faulkes Telescope North Afterglow Identification
  3. GRB 070208: ROTSE-III Optical Limits
  4. GRB 070208: MDM Observations
  5. GRB 070208: Swift detection of a burst
  6. GRB 070125 detection with CARMA
  7. Swift-BAT trigger 259527 is a Cosmic Ray Shower
  8. GRB 070125: Redshift z>~1.54 from Gemini Afterglow Spectrum
  9. GRB 070129: afterglow confirmation
  10. GRB070124: Swift-XRT Follow-up Observation
  11. GRB070126: Swift-XRT Observation
  12. GRB 070125: further AAVSO optical observations
  13. GRB 070129: Swift/UVOT Upper limits
  14. GRB 070129: dust-scattered X-ray halo detected by Swift/XRT
  15. GRB 070125: optical observation
  16. GRB 070125: WSRT Radio Detection
  17. Radio detection of GRB 070125
  18. GRB061217: MAGIC telescope GeV observation
  19. GRB 070125: confirmation of pseudo-redshift
  20. GRB 070129, Swift-BAT refined analysis of a particularly long
  21. GRB 070129: Xinglong TNT optical Upper Limit
  22. GRB 070129: Swift-XRT Refined Analysis
  23. GRB 070129: VLT observations
  24. GRB 070125: An IR Point Source and an Apparent Host Galaxy
  25. GRB 070129: Swift detection of a burst
  26. GRB 070126: Swift/UVOT refined analysis
  27. GRB 070125: further AAVSO optical observations
  28. GRB 070125: MITSuME Okayama optical observation
  29. Konus-Wind observation of GRB 070125
  30. GRB 070125: AAVSO optical observations
  31. GRB 070125: optical observations
  32. GRB 070126: VLT observations
  33. GRB070126: Swift-XRT possible detection of an afterglow
  34. GRB 070125: PROMPT detections
  35. GRB 070124: Suzaku WAM observation of the prompt emissions
  36. GRB 070125: WSRT Radio Observations
  37. GRB 070125: UVOT Detection in Ultraviolet Filters
  38. GRB 070126, Swift-BAT refined analysis of a very faint burst
  39. GRB070125: Optical observation by Kanata
  40. Possible GRB 070126: Swift/UVOT Upper Limit
  41. GRB 070125: UVOT Observations of a Fading Optical Afterglow
  42. GRB 070125: Xinglong TNT optical observations
  43. GRB 070125: Continued P60 Observations
  44. GRB 070125: pseudo-z~1.5 from spectral parameters of the prompt emission
  45. GRB 070125: Keck/LRIS Spectroscopy -- Evidence for a very low redshift
  46. GRB 070125: Lick 3m Spectroscopy
  47. GRB070125: Swift-XRT Refined Analysis
  48. GRB 070125: SARA detection in R
  49. GRB 070125: P60 Optical Afterglow Candidate
  50. GRB 070126?: Swift detection of a possible burst
  51. GRB070125 redshift request
  52. RHESSI Spectrum of GRB070125
  53. IPN-BAT localization of GRB070125 (very long duration, intense)
  54. Konus-Wind observation of short hard GRB 070124
  55. IPN localization of GRB070124 (short duration, hard spectrum)
  56. GRB 070110: optical break
  57. GRB 070110: Continued Detection and Request for Ground Followup
  58. GRB 050904: Second Epoch of HST/NICMOS Observations
  59. GRB 070110: Ep,i - Eiso correlation
  60. GRB 070107: Suzaku WAM observation of the prompt emission
  61. GRB 070110: VLT R-band photometry
  62. GRB 070110 declared a "Burst of Interest" by Swift team
  63. Further Retractions of previous Swift-BAT triggers
  64. Swift-BAT Trigger 255685 is not a GRB
  65. Trigger 255685: Swift detection of a possible burst
  66. GRB 070110: VLT absorption redshift
  67. GRB 070110: UVOT Observations of a Candidate Afterglow
  68. GRB 070110, Swift-BAT refined analysis
  69. GRB070107 Swift/UVOT Observations of a Fading Optical Afterglow
  70. GRB 070110: Swift detection of a burst with a possible optical afterglow
  71. IBAS Alert n. 4047: Not a GRB
  72. GRB070107: Swift/XRT refined analysis
  73. GRB 070107: Possible UVOT Afterglow
  74. GRB 070107, Swift-BAT refined analysis
  75. GRB 070107: Swift/XRT position
  76. GRB 070107: Swift detection of a burst
  77. VLA observation of GRB 061222B
  78. VLA detection of GRB 061222A
  79. GRB 061201: Nearby Galaxy Cluster Abell 995 is at z=0.0865
  80. GRB070103: KPNO 4m+FLAMINGOS J limit
  81. GRB 070103: Swift/UVOT Upper limits
  82. GRB 070103, Swift-BAT refined analysis
  83. GRB 070103: NOT observations
  84. GRB 070103: TAROT Calern observatory optical observations
  85. GRB 070103: Swift detection of a burst
  86. Retractions of previous Swift-BAT triggers
  87. GRB061222a: optical observations
  88. erratum : SDSS Pre-burst Observations of GRB061126
  89. Konus-Wind observation of GRB 061222A
  90. GRB 061210: Swift/XRT Astrometry Correction
  91. GRB 050826: MDM Redshift
  92. GRB 061222B: TAROT La Silla observatory early optical observations
  93. GRB 061218: TAROT La Silla observatory early optical observations
  94. GRB 061222A: MITSuME Akeno optical upper limits
  95. GRB 061222A: Confirmation of Gemini Afterglow Candidate
  96. GRB 061222B: MITSuME Akeno optical upper limits
  97. GRB 061222A: Xinglong Optical Limit
  98. GRB 061222A: Gemini Afterglow Candidate
  99. GRB 061222B, Swift-BAT refined analysis
  100. GRB061222A Swift/UVOT: Upper Limits

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