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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"

22086 results found.

  1. GRB 070227: Swift detection of a burst in ground analysis
  2. GRB 920925C: optical afterglow candidate
  3. GRB 070224: Swift/UVOT Upper Limits
  4. VLA observation of GRB 070223
  5. VLA observation of GRB 070220
  6. GRB070224: Magellan Imaging Observations
  7. GRB 070224: WHT K-band imaging
  8. GRB 070224: MDM Observations
  9. GRB070224: Gemini Imaging Observations
  10. GRB 070224: SARA upper limit
  11. GRB070224: Swift-XRT Refined Analysis
  12. GRB 070224: optical afterglow candidate
  13. GRB 070224: MASTER-Net refind analysis
  14. GRB 070224: MASTER-VWF-Kislovodsk observations
  15. GRB 070224: Swift detection of a burst
  16. GRB 070223: Optical observations
  17. GRB070223: Swift/UVOT refined analysis
  18. GRB 070223: Optical-IR observation with KANATA
  19. GRB070223: MASTER-VWF-Kislovodsk observations
  20. GRB070223 - SDSS Pre-Burst Observations
  21. GRB070223: Swift burst
  22. GRB 070220: MITSuME Okayama Optical Observation
  23. GRB 070220: ART-3 Optical and NIR limits
  24. Swift/UVOT refined analysis of GRB070220
  25. GRB 070209: Swift XRT refined analysis
  26. GRB 070220: Observation with the KANATA 1.5m telescope
  27. GRB 070219: Gemini Observations
  28. GRB 070220: Swift detection of a burst
  29. GRB070219: MASTER-VWF-Kislovodsk observations
  30. GRB 070219: Swift/UVOT Upper limits
  31. GRB 070219: I-band observations
  32. GRB 070219: optical TNG observations
  33. GRB 070219: ROTSE-III Optical Limits
  34. GRB070219 - SDSS Pre-Burst Observations
  35. GRB 070219: Swift detection of a burst
  36. GRB 070125 observations with the GMRT
  37. GRB 060927: PROMPT Observations
  38. GRB 070129: MDM I-band Detection
  39. GRB 070209: Swift XRT analysis
  40. IPN localization of very bright long hard GRB 070207
  41. IPN localization of very intense short GRB 070201
  42. GRB 070209: Swift detection of a short hard burst
  43. GRB070208 - SDSS Pre-Burst Observations
  44. GRB 070208: Swift detection of a burst
  45. GRB 070125 detection with CARMA
  46. GRB 070129: afterglow confirmation
  47. GRB070126: Swift-XRT Observation
  48. GRB 070129: Swift/UVOT Upper limits
  49. GRB070129: MITSuME optical observation
  50. GRB 070129: Xinglong TNT optical Upper Limit
  51. GRB 070129: Swift-XRT Refined Analysis
  52. GRB 070129: VLT observations
  53. GRB 070125: An IR Point Source and an Apparent Host Galaxy
  54. GRB 070129: Swift detection of a burst
  55. GRB 070126: Swift/UVOT refined analysis
  56. GRB 070125: optical observations
  57. GRB 070126: VLT observations
  58. GRB070126: Swift-XRT possible detection of an afterglow
  59. GRB070125: Optical observation by Kanata
  60. GRB070124: Swift-XRT Observation
  61. Possible GRB 070126: Swift/UVOT Upper Limit
  62. GRB 070125: UVOT Observations of a Fading Optical Afterglow
  63. GRB 070125: Xinglong TNT optical observations
  64. GRB 070125: Keck/LRIS Spectroscopy -- Evidence for a very low redshift
  65. GRB 070125: Lick 3m Spectroscopy
  66. GRB070125: Swift-XRT Refined Analysis
  67. GRB 070125: SARA detection in R
  68. GRB 070125: P60 Optical Afterglow Candidate
  69. GRB 070126?: Swift detection of a possible burst
  70. GRB070125 redshift request
  71. Konus-Wind observation of short hard GRB 070124
  72. IPN localization of GRB070124 (short duration, hard spectrum)
  73. Swift-BAT trigger 257213 is a Galactic Center transient
  74. GRB 070110: Continued Detection and Request for Ground Followup
  75. GRB 050904: Second Epoch of HST/NICMOS Observations
  76. GRB 070110: Ep,i - Eiso correlation
  77. GRB 070110 declared a "Burst of Interest" by Swift team
  78. Trigger 255685: Swift detection of a possible burst
  79. GRB 070110: UVOT Observations of a Candidate Afterglow
  80. GRB 070110, Swift-BAT refined analysis
  81. GRB070107 Swift/UVOT Observations of a Fading Optical Afterglow
  82. GRB 070110: Swift detection of a burst with a possible optical afterglow
  83. GRB070107: Swift/XRT refined analysis
  84. GRB 070107: Swift detection of a burst
  85. VLA observation of GRB 061222B
  86. VLA detection of GRB 061222A
  87. GRB070103: APO SPIcam i' and z' limits
  88. GRB 070103: Swift/UVOT Upper limits
  89. GRB070103: Swift XRT refined analysis
  90. GRB 070103: NOT observations
  91. GRB 070103: TAROT Calern observatory optical observations
  92. GRB 070103: Swift detection of a burst
  93. GRB061222a: optical observations
  94. erratum : SDSS Pre-burst Observations of GRB061126
  95. GRB 061210: Swift/XRT Astrometry Correction
  96. GRB 061222A: MITSuME Akeno optical upper limits
  97. GRB 061222A: Confirmation of Gemini Afterglow Candidate
  98. GRB 061222B: MITSuME Akeno optical upper limits
  99. GRB 061222A: Xinglong Optical Limit
  100. GRB 061222A: Gemini Afterglow Candidate

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