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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"

23464 results found.

  1. GRB 070220: ART-3 Optical and NIR limits
  2. Swift/UVOT refined analysis of GRB070220
  3. GRB 070209: Swift XRT refined analysis
  4. GRB 070220: Observation with the KANATA 1.5m telescope
  5. GRB 070219: Gemini Observations
  6. GRB 070220: Swift detection of a burst
  7. GRB070219: MASTER-VWF-Kislovodsk observations
  8. GRB 070219: Swift/UVOT Upper limits
  9. GRB 070219: I-band observations
  10. GRB 070219: optical TNG observations
  11. GRB 070219: ROTSE-III Optical Limits
  12. GRB070219 - SDSS Pre-Burst Observations
  13. GRB 070219: Swift detection of a burst
  14. GRB 070125 observations with the GMRT
  15. GRB 060927: PROMPT Observations
  16. GRB 070129: MDM I-band Detection
  17. GRB 070209: Swift XRT analysis
  18. IPN localization of very bright long hard GRB 070207
  19. IPN localization of very intense short GRB 070201
  20. GRB 070209: Swift detection of a short hard burst
  21. GRB070208 - SDSS Pre-Burst Observations
  22. GRB 070208: Swift detection of a burst
  23. GRB 070125 detection with CARMA
  24. GRB 070129: afterglow confirmation
  25. GRB070126: Swift-XRT Observation
  26. GRB 070129: Swift/UVOT Upper limits
  27. GRB070129: MITSuME optical observation
  28. GRB 070129: Xinglong TNT optical Upper Limit
  29. GRB 070129: Swift-XRT Refined Analysis
  30. GRB 070129: VLT observations
  31. GRB 070125: An IR Point Source and an Apparent Host Galaxy
  32. GRB 070129: Swift detection of a burst
  33. GRB 070126: Swift/UVOT refined analysis
  34. GRB 070125: optical observations
  35. GRB 070126: VLT observations
  36. GRB070126: Swift-XRT possible detection of an afterglow
  37. GRB070125: Optical observation by Kanata
  38. GRB070124: Swift-XRT Observation
  39. Possible GRB 070126: Swift/UVOT Upper Limit
  40. GRB 070125: UVOT Observations of a Fading Optical Afterglow
  41. GRB 070125: Xinglong TNT optical observations
  42. GRB 070125: Keck/LRIS Spectroscopy -- Evidence for a very low redshift
  43. GRB 070125: Lick 3m Spectroscopy
  44. GRB070125: Swift-XRT Refined Analysis
  45. GRB 070125: SARA detection in R
  46. GRB 070125: P60 Optical Afterglow Candidate
  47. GRB 070126?: Swift detection of a possible burst
  48. GRB070125 redshift request
  49. Konus-Wind observation of short hard GRB 070124
  50. IPN localization of GRB070124 (short duration, hard spectrum)
  51. Swift-BAT trigger 257213 is a Galactic Center transient
  52. GRB 070110: Continued Detection and Request for Ground Followup
  53. GRB 050904: Second Epoch of HST/NICMOS Observations
  54. GRB 070110: Ep,i - Eiso correlation
  55. GRB 070110 declared a "Burst of Interest" by Swift team
  56. Trigger 255685: Swift detection of a possible burst
  57. GRB 070110: UVOT Observations of a Candidate Afterglow
  58. GRB 070110, Swift-BAT refined analysis
  59. GRB070107 Swift/UVOT Observations of a Fading Optical Afterglow
  60. GRB 070110: Swift detection of a burst with a possible optical afterglow
  61. GRB070107: Swift/XRT refined analysis
  62. GRB 070107: Swift detection of a burst
  63. VLA observation of GRB 061222B
  64. VLA detection of GRB 061222A
  65. GRB070103: APO SPIcam i' and z' limits
  66. GRB 070103: Swift/UVOT Upper limits
  67. GRB070103: Swift XRT refined analysis
  68. GRB 070103: NOT observations
  69. GRB 070103: TAROT Calern observatory optical observations
  70. GRB 070103: Swift detection of a burst
  71. GRB061222a: optical observations
  72. erratum : SDSS Pre-burst Observations of GRB061126
  73. GRB 061210: Swift/XRT Astrometry Correction
  74. GRB 061222A: MITSuME Akeno optical upper limits
  75. GRB 061222A: Confirmation of Gemini Afterglow Candidate
  76. GRB 061222B: MITSuME Akeno optical upper limits
  77. GRB 061222A: Xinglong Optical Limit
  78. GRB 061222A: Gemini Afterglow Candidate
  79. GRB061222A Swift/UVOT: Upper Limits
  80. GRB 061222B: Swift/UVOT Upper limits
  81. GRB 061222B: Observation with the KANATA 1.5m telescope
  82. GRB061222B: Swift-XRT Refined Analysis
  83. GRB 061222A: Observation with the KANATA 1.5m telescope
  84. GRB 061222B: BOOTES-IR optical observations
  85. GRB 061222B: SARA upper limit
  86. GRB 061222A, Swift-BAT refined analysis
  87. GRB 061222B: REM NIR/optical observations
  88. GRB 061222B: TAROT La Silla observatory optical observations
  89. GRB 061222B: Swift detection of a burst
  90. GRB 061222A: Prompt ROTSE-III Optical Limits
  91. GRB 061222: Swift detection of a burst
  92. GRB 061201: Magellan Redshift of nearby Abell cluster
  93. GRB 061218: TAROT La Silla observatory optical observations
  94. GRB 061217: TAROT Calern observatory optical observations
  95. GRB 061218: TORTOREM optical upper limits
  96. GRB 061218, Swift-BAT refined analysis
  97. GRB061217: VLT NIR observations
  98. GRB 061218, SMARTS optical/IR observations
  99. GRB 061218: REM prompt observations
  100. Swift triggers (#251863) on a possible burst

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