Skip to main content
JSON Notices via Email, Kafka Cron Jobs, Submitter Profile, GCN is Hiring. See news and announcements

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"

16103 results found.

  1. GRB 120729A: Xinglong TNT optical upper limit
  2. GRB 120728A: Swift/UVOT Upper Limits
  3. GRB120729A - Faulkes Telescope North Optical Afterglow Candidate
  4. GRB 120729A: Swift detection of a burst with an optical afterglow
  5. GRB 120728A: GROND observations
  6. GRB 120716A: optical observation in Maidanak observatory
  7. GRB 120722A: optical upper limit
  8. GRB 120724A: optical observation in Maidanak observatory
  9. GRB 120716A: optical observation in CrAO
  10. GRB 120724A: Swift/UVOT Detection of the Optical Afterglow
  11. GRB 120724A: FTN optical afterglow candidate
  12. GRB 120722A: Swift/UVOT Upper Limits
  13. GRB 120722A: VLT/X-shooter redshift of the host galaxy
  14. GRB 120722A: Correction for GCN circ.13500
  15. GRB 120722A: Xinglong TNT optical afterglow candidate
  16. GRB 120716A: EVLA Detection
  17. GRB 120716A: Swift-XRT detection
  18. GRB 120716A: Swift/XRT position consistent with that of the optical counterpart
  19. GRB 120716A: Redshift confirmation from VLT/X-shooter
  20. GRB 120716A: GROND confirmation of the optical/NIR afterglow
  21. GRB 120716A: Optical decay from NOT
  22. GRB 120716A: Candidate Optical Afterglow from PTF
  23. GRB120714A: Swift/UVOT upper limits
  24. GRB 120714A: GROND upper limits
  25. GRB 120714B: GROND confirmation of fading afterglow
  26. GRB 120714B: Position Correction and Candidate Optical Afterglow
  27. GRB120711B: MITSuME Ishigakijima upper limits
  28. GRB 120712A: Swift/UVOT Detection
  29. GRB 120712A: GROND Detection of the Optical/NIR Afterglow Candidate and photo-z
  30. GRB 120712A: Swift detection of a burst with optical afterglow
  31. GRB 120711B: Swift/UVOT Upper Limits
  32. GRB 120711A: Swift/UVOT Observations
  33. GRB 120709A: Swift/UVOT Observations
  34. GRB 120711A: REM NIR early time detection
  35. GRB 120711A: an bright long GRB detected with INTEGRAL
  36. GRB 120711A: ROTSE-III confirm of Optical Counterpart
  37. GRB 120709A: optical afterglow limits
  38. GRB 120703A: SMARTS optical/IR observations
  39. GRB 120703A: NOT optical observation
  40. GRB 120703A: Swift detection of a bright burst with an optical afterglow
  41. GRB 120630A: Swift-BAT/-XRT/-UVOT refined analysis
  42. GRB 120630A: NOT optical source within the XRT error circle
  43. GRB 120624B: Swift/UVOT Upper Limits
  44. GRB 120624B: GROND upper limits
  45. Skynet/PROMPT observations of IGR J17062-6143 (Swift trigger 525148)
  46. GRB 120624B: NOT optical upper limit
  47. GRB 120624B: optical observations
  48. Swift trigger 524642 / SwJ1910.2-0546
  49. GRB 120612A: optical observations
  50. GRB 120612A: Swift/UVOT observations
  51. GRB 120612A: BOOTES-3 optical upper limit
  52. GRB 120521C redshift estimate
  53. GRB120521B: SSO 2.3m upper limits
  54. GRB 120521A: GROND Upper limits
  55. GRB 120521C: Swift/UVOT Upper Limits
  56. GRB 120521B: Swift/UVOT Upper Limits
  57. GRB 120521C: MASTER optical limit
  58. GRB 120521B: GROND Upper limits
  59. GRB 120521C: BOOTES-1 optical observations
  60. GRB 120521C: WHT optical observations
  61. GRB 120521C - NOT optical limits
  62. GRB 120521C: TAROT Calern observatory optical observations
  63. GRB 120521A: Swift/UVOT Upper Limits
  64. GRB 120521B/Fermi Trigger 359284074: early MASTER-ICATE optical limit
  65. GRB 120521B: TAROT La Silla observatory optical observations
  66. GRB 120521A: TAROT La Silla observatory optical observations
  67. GRB 120514A: Swift/UVOT Upper Limits
  68. GRB 120514A: TAROT Calern observatory optical observations
  69. GRB 120422A: Konkoly optical observations
  70. Fermi Trigger 358364818: BOOTES-4 observations
  71. GRB 120510B/Fermi Trigger 358364818: MASTER possible OT candidate
  72. GRB 120510A: MASTER follow up observations
  73. GRB 120422A: SN identification from GTC
  74. GRB 120422A: P200 NIR detection
  75. GRB 120422A: CARMA 3mm observations
  76. GRB 120422A: VLT/X-shooter spectroscopic evidence for a SN
  77. GRB 120422A: i-band re-brightening and possible SN detection
  78. GRB 120427A: MASTER follow up observations
  79. GRB 120422A: optical observations
  80. GRB 120422A: Additional Gemini observations and Keck/LRIS spectroscopy
  81. GRB 120422A: MITSuME Ishigakijima upper limit
  82. GRB 120422A: 272 GHz observations from SMA
  83. GRB 120422A: RAPTOR Limits During Gamma-ray Emitting Interval
  84. GRB 120422A: VLT/X-shooter spectroscopy of the GRB counterpart
  85. GRB 120422A: Xinglong TNT optical upper limit
  86. GRB 120422A: NOT optical observations
  87. GRB 120422A: Zadko observatory - Gingin optical observations
  88. GRB 120422A: Gemini observations
  89. GRB 120419A: Swift-XRT and UVOT observations
  90. GRB 120404A: optical observations in Mondy observatory
  91. GRB 120404A: optical observations
  92. GRB 120404A, Optical Observations
  93. GRB 120404A: SMARTS optical/IR observations
  94. GRB120404A: MOA optical observations of the initial rise afterglow
  95. GRB 120404A: VLT/X-shooter redshift confirmation
  96. GRB 120404A: Swift/UVOT Detection
  97. GRB 120404A: MITSuME Ishigakijima Optical Observation
  98. GRB 120404A: MITSuME Okayama Optical Observation
  99. GRB 120404A : TNT optical observation
  100. GRB 120401A: GROND Detection of an optical/NIR afterglow candidate

Advanced

Download all Circulars as a .tar.gz archive (updated once a day):
Questions or comments?
Contact GCN directly.
Have you found a bug in GCN?
Open an issue.
Want to contribute code to GCN?
Get involved on GitHub.

gcn.nasa.gov

A service of the Astrophysics Science Division at NASA Goddard Space Flight Center

Looking for U.S. government information and services? Visit USA.gov