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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"

37746 results found.

  1. GRB 070129: Xinglong TNT optical Upper Limit
  2. GRB 070129: Swift-XRT Refined Analysis
  3. GRB 070129: VLT observations
  4. GRB 070125: An IR Point Source and an Apparent Host Galaxy
  5. GRB 070129: Swift detection of a burst
  6. GRB 070126: Swift/UVOT refined analysis
  7. GRB 070125: further AAVSO optical observations
  8. GRB 070125: MITSuME Okayama optical observation
  9. Konus-Wind observation of GRB 070125
  10. GRB 070125: AAVSO optical observations
  11. GRB 070125: optical observations
  12. GRB 070126: VLT observations
  13. GRB070126: Swift-XRT possible detection of an afterglow
  14. GRB 070125: PROMPT detections
  15. GRB 070124: Suzaku WAM observation of the prompt emissions
  16. GRB 070125: WSRT Radio Observations
  17. GRB 070125: UVOT Detection in Ultraviolet Filters
  18. GRB 070126, Swift-BAT refined analysis of a very faint burst
  19. GRB070125: Optical observation by Kanata
  20. GRB070124: Swift-XRT Observation
  21. Possible GRB 070126: Swift/UVOT Upper Limit
  22. GRB 070125: UVOT Observations of a Fading Optical Afterglow
  23. GRB 070125: Xinglong TNT optical observations
  24. GRB 070125: Continued P60 Observations
  25. GRB 070125: pseudo-z~1.5 from spectral parameters of the prompt emission
  26. GRB 070125: Keck/LRIS Spectroscopy -- Evidence for a very low redshift
  27. GRB 070125: Lick 3m Spectroscopy
  28. GRB070125: Swift-XRT Refined Analysis
  29. GRB 070125: SARA detection in R
  30. GRB 070125: P60 Optical Afterglow Candidate
  31. GRB 070126?: Swift detection of a possible burst
  32. GRB070125 redshift request
  33. RHESSI Spectrum of GRB070125
  34. IPN-BAT localization of GRB070125 (very long duration, intense)
  35. Konus-Wind observation of short hard GRB 070124
  36. IPN localization of GRB070124 (short duration, hard spectrum)
  37. GRB 070110: optical break
  38. Swift-BAT trigger 257213 is a Galactic Center transient
  39. GRB 070110: Continued Detection and Request for Ground Followup
  40. GRB 050904: Second Epoch of HST/NICMOS Observations
  41. GRB 070110: Ep,i - Eiso correlation
  42. GRB 070107: Suzaku WAM observation of the prompt emission
  43. GRB 070110: VLT R-band photometry
  44. GRB 070110 declared a "Burst of Interest" by Swift team
  45. Further Retractions of previous Swift-BAT triggers
  46. Swift-BAT Trigger 255685 is not a GRB
  47. Trigger 255685: Swift detection of a possible burst
  48. GRB 070110: VLT absorption redshift
  49. GRB 070110: UVOT Observations of a Candidate Afterglow
  50. GRB070110: Swift XRT Team refined analysis
  51. GRB 070110, Swift-BAT refined analysis
  52. GRB070107 Swift/UVOT Observations of a Fading Optical Afterglow
  53. GRB 070110: Swift detection of a burst with a possible optical afterglow
  54. IBAS Alert n. 4047: Not a GRB
  55. GRB070107: Swift/XRT refined analysis
  56. GRB 070107: Possible UVOT Afterglow
  57. GRB 070107, Swift-BAT refined analysis
  58. GRB 070107: Swift/XRT position
  59. GRB 070107: Swift detection of a burst
  60. VLA observation of GRB 061222B
  61. VLA detection of GRB 061222A
  62. GRB070103: APO SPIcam i' and z' limits
  63. GRB 061201: Nearby Galaxy Cluster Abell 995 is at z=0.0865
  64. GRB070103: KPNO 4m+FLAMINGOS J limit
  65. GRB 070103: Swift/UVOT Upper limits
  66. GRB070103: Swift XRT refined analysis
  67. GRB 070103, Swift-BAT refined analysis
  68. GRB 070103: NOT observations
  69. GRB 070103: TAROT Calern observatory optical observations
  70. GRB 070103: Swift detection of a burst
  71. Retractions of previous Swift-BAT triggers
  72. GRB061222a: optical observations
  73. erratum : SDSS Pre-burst Observations of GRB061126
  74. Konus-Wind observation of GRB 061222A
  75. GRB 061210: Swift/XRT Astrometry Correction
  76. GRB 050826: MDM Redshift
  77. GRB 061222B: TAROT La Silla observatory early optical observations
  78. GRB 061218: TAROT La Silla observatory early optical observations
  79. GRB 061222A: MITSuME Akeno optical upper limits
  80. GRB 061222A: Confirmation of Gemini Afterglow Candidate
  81. GRB 061222B: MITSuME Akeno optical upper limits
  82. GRB 061222A: Xinglong Optical Limit
  83. GRB 061222A: Gemini Afterglow Candidate
  84. GRB 061222B, Swift-BAT refined analysis
  85. GRB061222A Swift/UVOT: Upper Limits
  86. GRB 061222B: Swift/UVOT Upper limits
  87. GRB 061222B: Observation with the KANATA 1.5m telescope
  88. GRB061222B: Swift-XRT Refined Analysis
  89. GRB 061222A: Observation with the KANATA 1.5m telescope
  90. GRB 061222B: BOOTES-IR optical observations
  91. GRB 061222B: SARA upper limit
  92. GRB 061222A: Swift-XRT refined analysis
  93. GRB 061217: Magellan host galaxy redshift
  94. GRB 061222A, Swift-BAT refined analysis
  95. GRB 061222B: REM NIR/optical observations
  96. GRB 061222b: Refined redshift
  97. GRB 061222b, SMARTS optical/IR afterglow observations
  98. GRB 061222B: TAROT La Silla observatory afterglow observation
  99. GRB 061222B: TAROT La Silla observatory optical observations
  100. GRB 061222b: Magellan redshift

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