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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"

28123 results found.

  1. GRB 070129, Swift-BAT refined analysis of a particularly long
  2. GRB 070129: Xinglong TNT optical Upper Limit
  3. GRB 070129: Swift-XRT Refined Analysis
  4. GRB 070129: VLT observations
  5. GRB 070125: An IR Point Source and an Apparent Host Galaxy
  6. GRB 070129: Swift detection of a burst
  7. GRB 070126: Swift/UVOT refined analysis
  8. GRB 070125: further AAVSO optical observations
  9. GRB 070125: MITSuME Okayama optical observation
  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 070125: WSRT Radio Observations
  16. GRB 070125: UVOT Detection in Ultraviolet Filters
  17. GRB070124: Swift-XRT Observation
  18. Possible GRB 070126: Swift/UVOT Upper Limit
  19. GRB 070125: UVOT Observations of a Fading Optical Afterglow
  20. GRB 070125: Xinglong TNT optical observations
  21. GRB 070125: Continued P60 Observations
  22. GRB 070125: Keck/LRIS Spectroscopy -- Evidence for a very low redshift
  23. GRB 070125: Lick 3m Spectroscopy
  24. GRB070125: Swift-XRT Refined Analysis
  25. GRB 070125: SARA detection in R
  26. GRB 070125: P60 Optical Afterglow Candidate
  27. GRB 070126?: Swift detection of a possible burst
  28. IPN-BAT localization of GRB070125 (very long duration, intense)
  29. GRB 070110: optical break
  30. GRB 070110: Continued Detection and Request for Ground Followup
  31. GRB 050904: Second Epoch of HST/NICMOS Observations
  32. GRB 070110: Ep,i - Eiso correlation
  33. GRB 070110: VLT R-band photometry
  34. GRB 070110 declared a "Burst of Interest" by Swift team
  35. Further Retractions of previous Swift-BAT triggers
  36. Trigger 255685: Swift detection of a possible burst
  37. GRB 070110: VLT absorption redshift
  38. GRB 070110: UVOT Observations of a Candidate Afterglow
  39. GRB070110: Swift XRT Team refined analysis
  40. GRB070107 Swift/UVOT Observations of a Fading Optical Afterglow
  41. GRB 070110: Swift detection of a burst with a possible optical afterglow
  42. GRB070107: Swift/XRT refined analysis
  43. GRB 070107: Possible UVOT Afterglow
  44. GRB 070107: Swift/XRT position
  45. GRB 070107: Swift detection of a burst
  46. VLA observation of GRB 061222B
  47. VLA detection of GRB 061222A
  48. GRB070103: KPNO 4m+FLAMINGOS J limit
  49. GRB 070103: Swift/UVOT Upper limits
  50. GRB070103: Swift XRT refined analysis
  51. GRB 070103: NOT observations
  52. GRB 070103: Swift detection of a burst
  53. Retractions of previous Swift-BAT triggers
  54. GRB061222a: optical observations
  55. GRB 061210: Swift/XRT Astrometry Correction
  56. GRB 050826: MDM Redshift
  57. GRB 061222B: TAROT La Silla observatory early optical observations
  58. GRB 061222A: MITSuME Akeno optical upper limits
  59. GRB 061222A: Confirmation of Gemini Afterglow Candidate
  60. GRB 061222B: MITSuME Akeno optical upper limits
  61. GRB 061222A: Xinglong Optical Limit
  62. GRB 061222A: Gemini Afterglow Candidate
  63. GRB061222A Swift/UVOT: Upper Limits
  64. GRB 061222B: Swift/UVOT Upper limits
  65. GRB 061222B: Observation with the KANATA 1.5m telescope
  66. GRB061222B: Swift-XRT Refined Analysis
  67. GRB 061222A: Observation with the KANATA 1.5m telescope
  68. GRB 061222B: BOOTES-IR optical observations
  69. GRB 061222A: Swift-XRT refined analysis
  70. GRB 061222B: REM NIR/optical observations
  71. GRB 061222b, SMARTS optical/IR afterglow observations
  72. GRB 061222B: TAROT La Silla observatory afterglow observation
  73. GRB 061222B: TAROT La Silla observatory optical observations
  74. GRB 061222b: Magellan redshift
  75. GRB 061222B: Swift detection of a burst
  76. GRB 061222b: optical afterglow
  77. GRB 061222A: Prompt ROTSE-III Optical Limits
  78. GRB 061222: Swift detection of a burst
  79. GRB 061217: Astrometry-Corrected XRT Position
  80. GRB 061201: Magellan redshift of nearby galaxy
  81. GRB 061217: Confirmation of host candidate
  82. GRB 061217: Object ib GCN 5948 is a star
  83. GRB 061217: Extended object in the revised XRT error circle
  84. GRB 061217, Candidate host galaxy
  85. GRB 061217 - Swift/XRT position correction
  86. GRB 061210: Possible Host Galaxy (S2-G2) Keck Spectrum
  87. GRB 061201: Magellan Redshift of nearby Abell cluster
  88. GRB 061217: TAROT Calern observatory optical observations
  89. GRB061217: VLT NIR observations
  90. Swift triggers (#251863) on a possible burst
  91. GRB 061217, SMARTS optical observations
  92. GRB061217: Swift/UVOT refined analysis.
  93. GRB 061217: optical observations at Calar Alto
  94. GRB061217 - Swift/XRT refined analysis
  95. GRB 061217: Swift detection of a short hard burst
  96. GRB 061210: MDM Follow-up Observation
  97. GRB061210: Swift/UVOT observations
  98. Swift-BAT Trigger 250908 is a Cosmic Ray Shower event
  99. GRB 061210: Optical sources near XRT positions
  100. GRB 061210: Swift XRT analysis - Possible counterparts

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