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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"

23566 results found.

  1. GRB070223: Swift burst
  2. GRB 070220: MITSuME Okayama Optical Observation
  3. GRB 070220: ART-3 Optical and NIR limits
  4. Swift/UVOT refined analysis of GRB070220
  5. GRB 070209: Swift XRT refined analysis
  6. GRB 070220: Observation with the KANATA 1.5m telescope
  7. GRB 070219: Gemini Observations
  8. GRB 070220: Swift detection of a burst
  9. GRB070219: MASTER-VWF-Kislovodsk observations
  10. GRB 070219: Swift/UVOT Upper limits
  11. GRB 070219: I-band observations
  12. GRB 070219: optical TNG observations
  13. GRB 070219: ROTSE-III Optical Limits
  14. GRB070219 - SDSS Pre-Burst Observations
  15. GRB 070219: Swift detection of a burst
  16. GRB 070125 observations with the GMRT
  17. GRB 060927: PROMPT Observations
  18. GRB 070129: MDM I-band Detection
  19. GRB 070209: Swift XRT analysis
  20. IPN localization of very bright long hard GRB 070207
  21. IPN localization of very intense short GRB 070201
  22. GRB 070209: Swift detection of a short hard burst
  23. GRB070208 - SDSS Pre-Burst Observations
  24. GRB 070208: Swift detection of a burst
  25. GRB 070125 detection with CARMA
  26. GRB 070129: afterglow confirmation
  27. GRB070126: Swift-XRT Observation
  28. GRB 070129: Swift/UVOT Upper limits
  29. GRB070129: MITSuME optical observation
  30. GRB 070129: Xinglong TNT optical Upper Limit
  31. GRB 070129: Swift-XRT Refined Analysis
  32. GRB 070129: VLT observations
  33. GRB 070125: An IR Point Source and an Apparent Host Galaxy
  34. GRB 070129: Swift detection of a burst
  35. GRB 070126: Swift/UVOT refined analysis
  36. GRB 070125: optical observations
  37. GRB 070126: VLT observations
  38. GRB070126: Swift-XRT possible detection of an afterglow
  39. GRB070125: Optical observation by Kanata
  40. GRB070124: Swift-XRT Observation
  41. Possible GRB 070126: Swift/UVOT Upper Limit
  42. GRB 070125: UVOT Observations of a Fading Optical Afterglow
  43. GRB 070125: Xinglong TNT optical observations
  44. GRB 070125: Keck/LRIS Spectroscopy -- Evidence for a very low redshift
  45. GRB 070125: Lick 3m Spectroscopy
  46. GRB070125: Swift-XRT Refined Analysis
  47. GRB 070125: SARA detection in R
  48. GRB 070125: P60 Optical Afterglow Candidate
  49. GRB 070126?: Swift detection of a possible burst
  50. GRB070125 redshift request
  51. Konus-Wind observation of short hard GRB 070124
  52. IPN localization of GRB070124 (short duration, hard spectrum)
  53. Swift-BAT trigger 257213 is a Galactic Center transient
  54. GRB 070110: Continued Detection and Request for Ground Followup
  55. GRB 050904: Second Epoch of HST/NICMOS Observations
  56. GRB 070110: Ep,i - Eiso correlation
  57. GRB 070110 declared a "Burst of Interest" by Swift team
  58. Trigger 255685: Swift detection of a possible burst
  59. GRB 070110: UVOT Observations of a Candidate Afterglow
  60. GRB 070110, Swift-BAT refined analysis
  61. GRB070107 Swift/UVOT Observations of a Fading Optical Afterglow
  62. GRB 070110: Swift detection of a burst with a possible optical afterglow
  63. GRB070107: Swift/XRT refined analysis
  64. GRB 070107: Swift detection of a burst
  65. VLA observation of GRB 061222B
  66. VLA detection of GRB 061222A
  67. GRB070103: APO SPIcam i' and z' limits
  68. GRB 070103: Swift/UVOT Upper limits
  69. GRB070103: Swift XRT refined analysis
  70. GRB 070103: NOT observations
  71. GRB 070103: TAROT Calern observatory optical observations
  72. GRB 070103: Swift detection of a burst
  73. GRB061222a: optical observations
  74. erratum : SDSS Pre-burst Observations of GRB061126
  75. GRB 061210: Swift/XRT Astrometry Correction
  76. GRB 061222A: MITSuME Akeno optical upper limits
  77. GRB 061222A: Confirmation of Gemini Afterglow Candidate
  78. GRB 061222B: MITSuME Akeno optical upper limits
  79. GRB 061222A: Xinglong Optical Limit
  80. GRB 061222A: Gemini Afterglow Candidate
  81. GRB061222A Swift/UVOT: Upper Limits
  82. GRB 061222B: Swift/UVOT Upper limits
  83. GRB 061222B: Observation with the KANATA 1.5m telescope
  84. GRB061222B: Swift-XRT Refined Analysis
  85. GRB 061222A: Observation with the KANATA 1.5m telescope
  86. GRB 061222B: BOOTES-IR optical observations
  87. GRB 061222B: SARA upper limit
  88. GRB 061222A, Swift-BAT refined analysis
  89. GRB 061222B: REM NIR/optical observations
  90. GRB 061222B: TAROT La Silla observatory optical observations
  91. GRB 061222B: Swift detection of a burst
  92. GRB 061222A: Prompt ROTSE-III Optical Limits
  93. GRB 061222: Swift detection of a burst
  94. GRB 061201: Magellan Redshift of nearby Abell cluster
  95. GRB 061218: TAROT La Silla observatory optical observations
  96. GRB 061217: TAROT Calern observatory optical observations
  97. GRB 061218: TORTOREM optical upper limits
  98. GRB 061218, Swift-BAT refined analysis
  99. GRB061217: VLT NIR observations
  100. GRB 061218, SMARTS optical/IR observations

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